QATAR PHASE IX PROJECT

Metal Deploye Resistor recently delivered, for the national company of electricity in Qatar, Kahramaa, more than one hundred Neutral Grounding Resistors (NGR) for the project “Qatar Phase IX”.

This project required the integration of resistor monitoring systems which allow ensuring the Neutral Grounding Resistor is not damaged after a fault has happened and will be thus able to limit further defect.

All these Neutral Earthing Resistors (NER) have been fitted into substations and help to protect the electrical network of Qatar.

The protection degree of these resistor frames is IP55, which is the highest protection degree for this kind of product.

Some Neutral Earthing Resistors have passed the heating test (temperature rise test) and IP55 protection degree test with success into some external international laboratories.

To finish, the project management has been particularly critical to meet the delivery date requested by the customers.

clip image0022 224x300 QATAR PHASE IX PROJECTclip image0023 224x300 QATAR PHASE IX PROJECT

BRAKING RESISTORS FOR INVERTERS

Resistors of power lower or equal to 2000 W

Metal Deploye Resistor offers a wide range of braking resistors for inverters.

Our resistors can dissipate up to 2000 w (2 kW) in continuous duty, with IP20 and 1600 W in IP23, allowing high load possibilities (more than 25 kW in 1 sec.)freinage variateur de vitesse BRAKING RESISTORS FOR INVERTERS

Most frequently asked references are available on stock : 28 Ω, 40 Ω, 53 Ω, 60 Ω and 100 Ω.

For any other ohmic values, please consult us.

Click here to see our technical datasheet bancs de chargeneutral earthing resistorneutral grouding resistorload banks résistances de point neutre résistances de mise à la terrerésistances pour filtres SVC rotorique2 BRAKING RESISTORS FOR INVERTERS

Statoric resistors

 

Statoric resistors are often used to start asynchonous squirrel cage motors (for exemple, centrifugal pumps). The using of statoric resistors ensures a better protection of the motors.

Standard statoric resistors :

Power from 0 up to 600 kW

Start-up time : 6, 8, 12, 15 and 30 seconds

2 consecutive starts or 10 starts/hour

statoric resistor Statoric resistors

Rotoric resistors

 

Rotoric resistors are often used for the starting asynchonous slip ring motors (for exemple, cranes, crushers, fans, compressors, pumps…)

Our resistors are calculated individually using the following data :

- Power (kW) – Rotor Voltage - Rotor current

- Number of start-ups steps

- Peak at the first step Ts/Tflc

- Start-up time or inertia of the machine being driven and speed

- High duty service

- Number and duration of starts/hour

  • Contactors can be integrated

Rotoric starting resistor3 Rotoric resistors

Control Cabinets

 

  • Manufacturing of short-circuiting cabinets associated to the starting resistors.
  • The control box allows the successive short-circuiting of resistor steps with power contactors. The working order is given by the line contactor of the customer (stator)
  • Additional services can be supplied on request.

control cabinet Control Cabinets

Braking resistor

 

Dissipation of energy generated by asynchronous squirrel cage motors,  which are controlled by speed variable drives

braking resistor Braking resistor

Electrolytic starters – Technical data

Below are the technical data needed to design your electrolytic starter :

Type of motor (slip ring, brush motor, rotor motor)

Power of the motor (in kW)

Rotor voltage (Ur in Volts)

Rotor current (Ir in Amps)

Driven machine

Number of starts per hour

Start-up type (on load or off load)

Reminder :

Slip ring motor :

  • Slipring motor
  • Brush motor
  • Rotor motor

 Squirrel cage motor :

  • Squirrel cage motor
  • Cage motor

Rotoric starter :

  • Slipring motor starter
  • Starting rheostat

 Statoric starter :

  • Squirrel cage starter

 Electrolyte : mix of water & soda which conductivity varies depending on soda dose (caustic soda, NaOH)

Soda concentration of Vectrohm is rarely superior to 0.5 %

Electrolytic starters – Vectrostar

 

Principle electrolytic starter demarreur electrolytique Electrolytic starters Vectrostar

With Vectrostar principle, the user obtains the maximum torque at very low speed (starting of locked and loaded machines can be accomplished).

Start-up current for slip ring motors from 0.5 to 1.5 rated current In.

 

Necessary technical data to quote your electrolytic starter : click here bancs de chargeneutral earthing resistorneutral grouding resistorload banks résistances de point neutre résistances de mise à la terrerésistances pour filtres SVC rotorique1 Electrolytic starters Vectrostar

How to choose your electrolytic starter

electrolytic starters Electrolytic starters Vectrostar

 

Performances

  • Drastic decrease ingamme demarreurs electrolytiques vectrostar r cim 300x200 Electrolytic starters Vectrostar start-up overcurrent
  • Adjustement of maximum torque with minimum current
  • Suppression of mechanical shocks through a constant acceleration torque and progressive speed increase.
  • Enables a number of start-ups in a row without any possible damage to the resistivity
  • Suitable for a wide range of motors allowing motor and machine changes.

Adaptability

The dosage of the electrolyte allows a perfect adaptation of Vectrostar R to the operating environment of the motor (resistant torque, inertia, load, etc). the duration of the start-up depends on the dosage of the electrolyte, as well as on the adjustment of the flow valve which controls the electrolyte flow entering the start-up tank.

Consistency

The electrolyte reserve tank is large enough to allow an efficient circulation into the start-up upper tank.

Subsequent start-ups can be made without changing their characteristics.

SecurityElectrolytic starter R1500 demarreur electrolytique Electrolytic starters Vectrostar

The Vectrostar R envelope provides an electrical insulation (except for Vectrostar from R1500 up to R4000 which have to be earth connected)

A thermostat monitors the electrolyte temperature inside the start-up tank.

Robustness :

IP 569 protection, corrosion resistant equipment, limited maintenance is required. The starters from Vectrostar R1500 to R4000 are made in stainless steel (AISI 304L as a standard)

Reliability and maintenance :Electrolytic starter R4000 demarreur electrolytique 300x236 Electrolytic starters Vectrostar

Low operating temperature minimizes electrolytic fluid maintenance

Unit can be installed in any location. Harsh environments are not a problem.

Standard unit controls allow full automation of start-ups.

Economical

installation flexibility and low maintenance make the Vectrostar very economical.

Request for quotation

LOAD BANK IN MIDDLE EAST

 

load bank kuwait1 LOAD BANK IN MIDDLE EAST2 load banks supplied by METAL DEPLOYE RESISTOR have just been commissioned at Kuwait International Airport.

The load banks are installed in an emergency sub-station composed of 3 generator sets which supply energy to airport equipments in case of network power cut, and hereby ensures the air traffic.load bank1 LOAD BANK IN MIDDLE EAST

The load banks are used to load the generator sets during periodic tests. The aim of these tests is to ensure the good working of generator sets in case of power cut.

With its know-how and experience, METAL DEPLOYE RESISTOR has innovated by supplying a specific solution and design, which were adapted to Middle East extreme climate conditions.

Jobs on offer

Coming Soon

Jobs & Careers

You can apply by sending your CV & application letter by email : info[at]mdresistor.com

You can also send your application letter & CV by mail to the following address :

METAL DEPLOYE RESISTOR

Direction des ressources humaines

1 route de Semur – BP150

21500 Montbard – France

Click here to see our job offers

Spare parts

For any inquiry for spare parts for resistors or electrolytic starters, please fill in the form below :

pompe montée démarreur électrolytique electrolytic starter pump1 Spare partskit de mise en service démarreur electrolytique electrolytic starter Spare parts

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1033852736 Spare parts
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Replacement

 

METAL DEPLOYE RESISTOR is able to replace the following brands : La Thermostatique, TOLREX, FILREX, La Mécano, and CIM and ETEL starters.
For any inquiry, we invite you to contact us with the serial number of the resistor.

RESISTANCE LA MECANO4 229x250 ReplacementRESISTANCE SEIEM1 Replacement

Operaters’ manual

If you want to receive the operater’s manual, please fill in the form below :

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1862128531 Operaters’ manual
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série 400 en anglais

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Power: kW
Voltage: kg /h
Airflow through the resistor: A
Inlet air température: °C
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Minimum resistance at 20°C: Ohms
Maximum ohmic value at hot stage: Ohms
Braking cycle type: - Constant power during breaking duration:
P= kW during Sec every Sec

- Decreasing power during braking:
De P = kW at Sec every Sec

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Motor power : kW
Rated voltage(Un): V
Rated current(In): A
Couple of short-circuit: Ccc/Cn
Short-circuit: Icc/In
Starting time: Sec
Starting current with resistance: Id/In
Driven machine:
Number of operations per hour:
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Power : kW
Rotor number of phases: V
Rotor voltage (Ur): V
Full load rotor current: A
Driven machine:
Number of resistor steps:
Service : seconds starting per cycle of seconds
Number of starts per hour :
Quantity:
Package Type:
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Documentation request

What documentation do you need ?

GROUNDING :  Yes
FILTERING:  Yes
MOTOR CONTROL :  Yes
LOAD BREAKDOWN STRENGTHE :  Yes
NATURAL VENTILATION LOAD :  Yes
TRACTION :  Yes
VECTROHM R25 A R200 :  Yes
DATA SECURITY FREEZE :  Yes
SAFETY DATA SHEET SODIUM :  Yes
OIL DATA SECURITY ANTI-EVAPORATIO :  Yes
Other request:

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Network voltage: Kv
Default current: V
Fault duration: Sec
Permanent current: A
Ohmic value: Ohms
Connections:
Current transformers:
If yes, characteristics of transformer:
Switch:
If yes, switch characteristics:
Installation:
Protection degree: ex : IP23
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System voltage: Kv
Resistance at hot stage: Ohms
Nominal duty current: A
Nominal duty power: kW
Overload :
Transient current at cold stage: A during sec
BIL: Terminal to terminal HV/LV kV peak
HV to ground kV peak
LV to ground kV peak
Pollution level: mm / kV
Environment : Wind speed : m/s
Altitude : masl
Seismic requirement : mm / kV
3 phases can be stacked : mm / kV
Protection degree: IP
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Engine Type
Power : kW
Rotor voltage (Ur): V
Intensity rotor (Ir): A
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demand for manual startup

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Voltage: V
Frequency : Hz
Total Power: kW
Power steps: kW
Configuration:
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Auxiliary power: V
Our cabinets are equipped with a switch, fuses and switches for each phase section.
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Quotation request power resistor

  1. Quotation for Neutral Earthing/Grounding Resistors
  2. Quotation for Harmonic Filter Resistor
  3. Quotation for Load bank
  4. Quotation for rotoric motor starting resistor
  5. Quotation for electrolytic starter – Vectrostar R
  6. Quotation for braking resistors
  7. Quotation for Railway traction
  8. Quotation for startup resistor direct current
  9. Quotation for statoric motor starting resistor
  10. Quotation for Drying resistor

Motor control (Factsheet)

START – BRAKES – SHUNTING

Resistance metal expanded metal with high heat capacity and high heat transfer coefficient. Dynamic system.

Quotation request

Stator resistance.

moteur1 Motor control (Factsheet) moteur2f Motor control (Factsheet)

Standard:

* Power from 0 to 600 kW
* Starting time of 6, 8, 12, 15 and 30 seconds
* 2 consecutive starts and 10 starts per hour
* Starting Line: Icc / In = 6 CCC / C n = 1.6
* Starting with resistance: Id / In = 3.5 / Tn = 0.54

Calculation tailored to different characteristics to tell us.
Possibility of integration of the contactors.

Rotor resistance
moteur3 Motor control (Factsheet) moteur4f Motor control (Factsheet)

Custom calculation from the following to tell us:

* P (kW)
* Ur (V)
* Ir (A)
* Number of clicks at startup
* Point to the first notch / Tn
* Startup time or total inertia and speed of the driven masses
* Service: Number and duration of operations / hour
* Possibility of integration of the contactors.

Selection criteria

* Speeds of high starting and braking.
* Long startup time and braking.
* Extremely harsh conditions, eg H2S, high temperatures …
* No limit of power or voltage.
* Adjust speed, starting, braking, a DC motor.
* Discharge excitation winding alternator, electric carrying.
* Replacement of any equipment brand Mechano The French, the thermostat, SEIEM, GEC France, FILREX, TOLREX.

Braking Resistors Quotation request
Dissipation of energy generated by the cage induction motors driven by variable speed variable frequency.freinage Motor control (Factsheet)

Electrolytic starters

Control cabinets

Contact us for quotation request

Conducting cabinet shorting associated with resistance to boot. The cabinet allows the bypassing of successive notches of resistance by power contactors, the running order given by the customer’s line contactor (STATOR).
Additional services can be provided on request.

armoire Motor control (Factsheet)

Electrolytic starters

Quotation request

electrolytique3 Motor control (Factsheet) electrolytique2 Motor control (Factsheet)

# Electrolytic Starter still operating in liquid phase.
Continuously variable and progressive resistance.
# Engine rings: range from 0 to 4000 kilowatts (beyond on request).
# Cage motor: range from 0 to 400 kW (wye)

electrolytique Motor control (Factsheet)

Selection criteria

* Staging and flexible boot.
* Easy adjustment without calculation.
* Reproducibility of startups

# Daptation to actual operating conditions.
# Product catalog available.
# Function switching and motor protection integrated or integrable.
# Replacement of any brand device ICD STARTERS, VECTROHM

Neutral earthing resistors – Neutral grouding resistors – NER/NGR

 

By their nature and function, power distribution networks are often subject to incidental flaws. It is therefore important to install protection systems. This protection depends on the treatment of neutral. They are 3 methods of neutral earthing :

Neutral isolated (Fig. 1) – This technique induces significant risks in the event of one phase grounding. It  is used only on small networks at low voltage.

fig1 Neutral earthing resistors Neutral grouding resistors NER/NGR

  • Direct grounding of the neutral (Fig. 2) – The neutral system is directly connected to the earth. In such case, the short circuit current can reach 20 to 30 times the rated current.

fig2 Neutral earthing resistors Neutral grouding resistors NER/NGR

  • Neutral grounding with limitation of fault current (Fig. 3) – This technique consists in inserting an impedance between neutral and earth. There are 3 types of impedances earthing:

1. Earthing through resistor
2. Earthing through reactance
3. Suppression coil (Petersen coil)

 fig3 Neutral earthing resistors Neutral grouding resistors NER/NGR

The neutral earthing resistor is the most common, economical and sufficient solution. It is used when the neutral of the supply transformer is available and its own impedance is not enough to limit the fault current. Our Neutral grounding resistors, supplied all over the world, are known for their solidity, reliability, performance and low maintenance requirement.

CALCULATION OF NEUTRAL EARTHING RESISTORS

Three parameters are required to specify the earthing resistor:

* T (in seconds) during which the default
* U (V) : Rated voltage line to line voltage or system voltage (kV)
* If (A)  : current through the resistor during the fault

Resistance value :

mtfom1 Neutral earthing resistors Neutral grouding resistors NER/NGR

The rise in the resistor temperature will be provided by the relation :

mtfom2 Neutral earthing resistors Neutral grouding resistors NER/NGR

As per IEEE-32 for neutral earthing resistor made from stainless steel resistance material, the allowable temperature rise for 10s, 30s, or 60s time rating is 760°C, 610°C for extended time rating and 385°C for continous rating.

Load banks Factsheet

Load banks Factsheet

Compact, ergonomic, silent, modular, new models in this range have expanded further improved reliability which is famous EXPANDED METAL SA for 50 years.

STANDARD MODELS

banc naturelle Load banks Factsheet
15kW sous 400V convection naturelle

100kW et 400kW sous 400V ventilation forcée

APPLICATION:

* Bench charge: to ensure the sustainability of generators.
* Test: To test and adjust protective devices and cutting and ensure regular maintenance of bbanc special Load banks Factsheetatteries.

NATURAL SERIES:

* Natural convection cooling.
* Power from 5 to 125 kW in a frame.
* Login at the bottom (cold zone).
* Degree of protection IP 13 (outdoor use current).
* Options: terminal (DIN), IP 23, roulette

SERIES VENTILATED 400, 700 and 800

* Cooling forced air horizontally.
* Power 50 kW to 1200 kW three-phase, notches from 10 kW.
* Fan coil muffler – motor lP 54.
* Contact Security (ventilation control).
* Options: terminals on opposite side wheels, double insulation, control cabinets.

SPECIALS MODELS

banc special 1 Load banks Factsheet
Charge Tunnel 40 kW 400 V

Our modern technology (CAO.DAO, mechanical calculations, laboratory testing of heat and vibration …) allow us to quickly create custom equipment:

* Load resistor type “Tunnel” (the cons) that fits into the air duct of the generator.
* High voltage and high frequency.
* Forced air cooling vertical
* Centrifugal fan.
* Additional chokes.
* Control panel, automatic load shedding.

TECHNOLOGY:

* Expanded metal grilles type Gridex U, N or F in stainless steel variable geometry, low self, excellent resistance to vibration and pollution.
* Envelopes galvanized steel bolts and stainless steel: high resistance to corrosion and shocks.

About us

The experience and technical expertise to serve customers

office open space metal deployed resistor 300x80 About us

 

MDR 014 About us

Test laboratory and R & D.
Our on-site research department has extensive knowledge of the industries in which our resistors will operate.  This is important as it enables us to develop products that exactly fit our clients’ needs
The company operates on an extremely efficient basis and our primary objective is client satisfaction, from initial design through to delivery.
Our applied research laboratory allows us to carry out thermal and mechanical tests, as well as electrical and dielectric measurements up to 150 kV.  Final quality assurance checks are carried out at our dedicated test station. In order to maintain our technical advantage, METAL DEPLOYE RESISTOR works closely with research institutions and independent laboratories. Recherchetdveloppement About us

Temperature range trials
ISO 9001-version 2008 certified: our procedures ensure continuous quality assurance from initial design through to product installation.  As well as routine test cases we are also able to undertake a number of specialised tests.
The structure of our organization together with our quality procedures enables us to best meet our clients’ needs

MDR 011 195x300 About us
 logo cesi About us  images edf About us
   

Metal Deploye Resistor

The power resistors Metal Deploye Resistor

Our different applications:
Energy:
- Grounding,
- Filtering
- Integration of components related to the power resistor (disconnectors, switches, crossings, CT, …)

resistance de mise a la terre resistance de point neutre malt1 Metal Deploye Resistorresistance de filtrage dharmoniques filtre 187x250 Metal Deploye Resistorresistance de filtrage barrage des 3 gorges chine1 Metal Deploye Resistor

Load resistance:

- Load Bank convection,
- Load Bank forced ventilation (tunnel support)
- Benches discharge, battery and load current,
- Test load specific laboratory charge
- Control command, control, control cabinet.

moz screenshot Metal Deploye Resistor

bench to load with forced ventilation cabinet of control 300x225 Metal Deploye Resistor

Motor control:

- DC motor,
- Stator
- Resistance of excitement, shock, …
- Braking (lifting, translation, direction)
- Cabinets.

resistances de demarrage statorique ou rotorique Metal Deploye Resistor

Vectrohm:

- Starters electrolytic
- Consumables
- Spare parts.

Resistance to traction (braking rheostats and resistors auxiliary):

- 1st rises
- Renovation.
Industrial heating:

- Industrial furnaces,
- Furnaces.

Les Echos news

mdr revue presse les echos Les Echos news

“Yann Fouquet, Director General of Expanded Metal Resistor, cultivates two qualities: friendliness and competence in any event in his trade.

This former Gadz’Arts, thirty-seven years, do not count the hours since January 2003 that the Italian family Fornari (Telema) resumed Vallourec its innovative strength. “I am fortunate to have the confidence of shareholders and I can drive the development strategy in my own way,” said the officer.
The company, based in Montbard (Côte-d’Or) on one of the industrial areas of the former group, displays a fine health. If the crisis still disturbs some sales, it makes almost 11 million euros in turnover with 70 people, exports to nearly 60% in 70 countries, earning money and investing.

Not less than 2.8 million will be injected into his workshops to 2012, both to develop the site, incorporating new technologies, for renewing equipment. The manufacturer of resistors to ground for power plants, harmonic filtering resistors, ideal for eradicating parasites turbines of dams like the Three Gorges in China, but also banks
charge and many other units that adapt to engines or traction with vision.

By 2015, it covers 20 million euros of business. To achieve this ambitious goal, the French number one industry on innovation. A new technology dedicated to weaving, with a machine designed to work in-house wire glass, just be initem. “It allows us to produce smaller power resistors from 800 watts to 1 kilowatt, and opens a new market with excellent prospects,” said Yann Fouquet.

The recent integration of bodywork based in Stigny, in Burgundy, also offers a better finish product. Tomorrow, Expanded Metal Resistor cherishes the ambition to pursue other activities related to acquisitions of resistance, such as relays or switches.

This success, Yann Fouquet attributed primarily to its teams, but it gives them the means. The training program exceeds the following years, three to five times the legal obligations. The budget for R & D, it is around 5% of turnover. “We were dying out in Vallourec, not their fault, it just had to change management methods to restore the reactivity of an SME,” confesses this confirmed bachelor.

DIDIER HUGHES

GRIDEX N&F

gridexnf GRIDEX N&F

PRESENTATION

The Gridex N (Natural convection cooling) or Gridex F (Air forced cooling) use precision cut expanded metal as resistances elements.
These elements feature accurately controlled mesh having solid, integral ends for mouting and connection.

DESIGNING OF ELEMENTS

Type of mesh
There are two basic mesh designs :
open mesh : for low resistance values,
closed mesh : for high resistance values.

Resistance elements
Two basic designs : flat elements, C (or Grider) elements. The choice of design is based on resistance value, cooling requirement and mechanical rigidity.

Assembly of resistance elements
Resistance elements are stadked together on stainless steel threaded rods, the connection on each element to its neighbor is made by hot spot welding.

Insulation
the insulation between resistance elements themselves and rods is made by :

  • ceramic rings as standard application
  • mica tube and washers to prevent vibration, trepidation (this method is mostly used for dynamic braking or railway resistor applications).

Heat dissipation
the precision cut expanded metal resistance elements; provide a maximum heat dissipation surface either through natural convection or air forced cooling.

Resistance value precision
the precision cut expanded metal sheet technique can provide required resistance value with low tolerance by varying the dimensions of the mesh.

Flexibility
the flexibility of expanded metal resistance allows in most cases to fit with restricted available space as well as to optimize the weight i.e. providing low weight with low cost per kW for continuous rating and if necessary high weight grids for difficult cycles.

gridexft2 GRIDEX N&F

APPLICATIONS

  • Dynamic braking resistor (air forced or natural cooling).
  • High fault current or high voltage Neutral Earthing Resistor.
  • High power and high voltage harmonics filter resistorLoad banks.
  • Heating.

ALLOYS

The different type of used alloys are :
Nickel Chromium stainless steel (18% Cr, 10% Ni, AISI 304, 20% Cr, 32% Ni 32/20, 20% Cr, 63% Ni 63/20)

GRIDEX U

gridexu GRIDEX U

PRESENTATION

  • Excellent heat dissipation.
  • Resistant elements attached mechanically by solid bands that are at relatively low temperature compared to the active part.
  • An increased service life for the resistant elements as well as holding and insulating parts. Moreover, the mechanical studiness of assemblies is preserved.

DESCRIPTION

The Gridex U system is made from collections of expanded metal grids (RU) edged :

  • on the two short sides, by adhering solid band designed for mechanical attachment and for the electrical connections,
  • on the two long sides by U section stainless-steel stiffeners. A flexible insulating tape (mica paper) housed inside the stiffener, whilst considerably protruding, provides insulation between the latter and the edge of the grid.

ASSEMBLY

Grids are stacked together on two steel tie rods threaded at the ends. Insulation between the grids and rods is obtained by shouldered ceramic rings. The assembly is locked by nuts and “contact washers”.

CONNECTIONS

The connection between grids designed to ensure continuity of the electrical circuit are obtained by a stainless steel jumper hot spot welded to consecutive grids. Welded jumpers confer excellent mechanical rigidity of the whole unit. They are duplicated in case of high current.

RANGE

Gridex U Grids design allow us to obtain different types of grids with standard dimensions (180 x 360) with resistance values varying from 0.0114 à 12.7 ohms according to the grid thickness (from 0.4 to 3 mm) or resistance material alloy of mesh type. Each grid can withstand 600V or 1.2 kV BIL

gridexut2 GRIDEX U

APPLICATIONS

  • Neutral Earthing Resistor
  • Harmonics filter for SVC or HVDC Sub-stations
  • Load banks
  • Rheostatic control

ALLOYS

The different type of used alloys are :

  • Nickel chromium stainless steel (18% Cr, 10% Ni AISI 304, 20% Cr, 32% Ni 32/20)
  • Aluminium chromium steel Cv AP

GRIDEX G

gridexg GRIDEX G

PRESENTATION

GRIDS PREPARATION

After being cut out, the consecutive bands of a grid are alternatively separated and insulated from each other by an internal separator consisting of a box or stainless steel flanked by two sheets of mica.

GRIDS ASSEMBLY

The grids with their internal separator are screwed on two tie-rods and insulated from each other by external separators, themselves attached to two mica sheets. The tie-rods are insulated by a mica grommet. The stacking thus obtained, after treatment in a steam bath, is press-clamped to form a compact battery.

GRIDES CONNECTION

Continuity of the electrical circuit is obtained by spotwelding the end bands of the consecutive grids. The junctions are designed to act as taps, to which it is possible to connect screw and nut. Finally, the ends band are twisted, to prevent any possibility of contact between them. The Gridex G, thus assembled, makes a sturdy, stainless steel unit which is maintenance free and easy to connect.

gridexg GRIDEX G

APPLICATION

Rheostatic control starting resistors for slip ring motor or squirel cage motor

ALLOYS

The different type of used alloys are :

  • Ferritic steel
  • AISI 304- 18/10 Stainless Steel
  • Refractory Steel
  • Cupro Nickel Alloy
  • Aluchrome

GRIDEX T

gridext GRIDEX T
Woven Grids

PRESENTATION

This technology enables to propose Power Resistors with high Resistance values (up to several hundred ohms).
Moreover, these resistors are particularly well adapted to applications requiring high voltages (continuous and transitory).

THE RESISTIVE WIRE

It is the woof of the mat. The wire diameter can vary from 0.3 to 2mm.Various alloys are available as standards (from Konstantan which has a zero temperature coefficient, to stainless; steel type alloy or iron-chrome-aluminum). The P distance (Fig 1) varies accordingly to the wires nature and diameter, and is usually between 1 and 5 mm.

THE CHAIN WIRE

It has to maintain the resistive wire as well as to keep an optimum coefficient of thermal exchange. A E class fiberglass is proposed as a standard. It presents the following advantages:

  • high temperature withstanding :
    • above 450′C for short time ratings
  • low coefficient of linear thermal dilatation. The mats have a low length variation according to temperature which makes the fixation simple.
  • excellent hot mechanical tensile stress resistance,
  • strong resistance to pollution (except fluorine pollution).

A wide range of materials (cotton, kevlar, silica fiber) can be proposed for specific applications.

DIMENSION AND DESIGN

The weaving process provides a large flexibility in the choice of the L and 1 dimensions.
However, in order to rationalize our products, we propose 2 standard widths :160 mm and 250 mm.
The plain strips at the ends are used for mechanical fixation and can also take part to the electrical insulation.
We currently use two different arrangements (Fig.2) : the mats can be used as independent resistors, either fixed between 2 supports ensuring the insulation, or in a ” U ” form , or rolled, to give them a sufficient inertia, in order to be self standing. In most cases, they are used in banks and connected in series or in parallel, or in a combination of both.

gidextfig1 GRIDEX T gidextfig2 GRIDEX T

APPLICATIONS

  • harmonics filter
  • Resistor
  • low discharge of high voltage capacitors
  • infrared heating
  • they are also dedicated to applications where space limitations necessitate a specific and sometimes complex mechanical design. This occurs in small heating units.

ELECTRONIC STARTER

Vectrostar R

Get an estimate

ELECTROLYTIC STARTER

vectrostar0 ELECTRONIC STARTER

PRINCIPLE

Thanks to the VECTROSTAR R principle, the user obtains the maximum torque at very low speed (starting of locked and loaded machines can be accomplished). Start-up current for slip-ring motors from 0,5 to 1,5 rated current in.

vectrostar1 ELECTRONIC STARTER

PERFORMANCES

  • Drastic decrease in start-up overcurrent.
  • Adjustement of maximum torque with minimum current.
  • Suppression of mechanical shocks through a constant acceleration torque and progressive speed increase.
  • Enables a number of start-ups in a row without any possible damage to the resistivity.
  • Suitable for a wide range of motors allowing motor and machines changes

ADVANTAGES – SMOOTHESS

The continuous and controlled decrease in rotor resistance provides start-ups without mechanical snatches.

ADAPTABILITY

The dosage of the electrolyte allows a perfect adaptation of VECTROSTAR R to the operating environment of the motor (resistant torque, inertia, load, etc…). The duration of the start-up depends on the dosage of the electrolyte, as well as on the adjustment of the flow valve which controls the electrolyte flow entering the start-up tank.

vectrostar2 ELECTRONIC STARTER

CONSISTENCY

The electrolyte reserve tank is large enough to allow an efficient circulation into the start-up upper tank. Subsequent start-ups can be made without changing their characteristics.

SECURITY

The VECTROSTAR R envelope provides an electrical insulation, except for Vectrostar from R 1500 up to R 4000 which have to be earth connected).
A thermostat monitors the electrolyte temperature inside the start-up tanks.

ROBUSTNESS

IP 569 protection, corrosion resistant equipment, limited maintenance is required. The starters from Vectrostar R 1500 to R 4000 are built in stainless stell. 5AISI 304L as a standard).

RELIABILITY AND MAINTENANCE

  • Low operating temperature minimizes electrolytic fluid maintenance.
  • Anti-corrosive electrodes eliminate oxidation and breakage.
  • Unit can be installed in any location. Harsh environments are not a problem.
  • Standard unit controls permit full automation of start-ups.

ECONOMICAL

Installation flexibility and low maintenance make the VECTROSTAR very economical.

SELECTION CHART

STARTER R25 R65 R120 R200 R200P R200T R800 R1500 R4000
Slipring motor (kW)
Loaded start-up
Unloaded start-up		 40
50		 90
110		 160
200		 300
355		 600
650		 900
1000		 900
1000		 2200
2800		 4000
5000
AND UP TO 6000 kW ON REQUEST – R1500P – R2500P – R4000 – R4000P
Rotor voltage indicative (Volts) 600 600 800 800 800 850 850 2000 3000

VECTROSTAR R : ELECTRICAL DIAGRAM

This electrical diagram is not exhaustive. We can propose different options and supply the specific electrical diagram you could require.

vectrostar3 1 ELECTRONIC STARTER

Harmonic Filter Resistors

Modern electrical equipment requires a stable voltage supply with low levels of harmonic distortion. However, electrical installations often generate interference causing disturbance to electrical networks. This leads to various problems such as:

  • Overheating
  • Malfunctioning of control or remote monitoring systems
  • High currents in the different phase or neutral lines
  • Resonance problems.

resistance de filtrage barrage des 3 gorges chine1 298x300 Harmonic Filter Resistors

rte%20filtrage Harmonic Filter Resistors
Filtering resistor 130 kW pt – 347 ohms

As a result it is necessary to have harmonic filters. These are basically composed of capacitors and inductors. The addition of a resistor allows:

  • Easier filter tuning at installation,resistance de filtrage dharmoniques filtre 225x300 Harmonic Filter Resistors
  • Widening of the pass band,
  • Greater tolerance of temperature changes in the components.

DESIGN OF POWER RESISTORS FOR HARMONIC FILTERING

1. Power dissipation :

Energy is partially stored in the material of the active heating elements. The remaining energy has to be transferred to the surroundings either by radiation or by convection. This depends on :

- the design of the resistor
- the surface characteristics of the heating elements
- the temperature difference between the ambient air and the heating elements

2. Resistance value:
The specification must indicate the nominal value of the resistor.Harmonic filter resistor 300x186 Harmonic Filter Resistors

3. Breakdown Voltage:
The resistor must be designed to respect minimum physical separation distances between the different components to avoid arcing (enclosure to components; enclosure to bench; enclosure to frame; connectors etc.).

4. Inductance:
Connectors have to be carefully designed and examined as high current transients can create undesirable electromagnetic forces.

5. Miscellaneous :
Environmental and site conditions (any specific pollution, seismic activity, corrosive substances, wind, altitude etc.).

To define specific parameters related to your requirements, please consult us.

Technologies

METALLIC RESISTORS

gridexu1 1 TechnologiesGRIDEX U : For standard applications of long or short periods of operation, Gridex U resistors have a simple design which combines the thermal properties of Gridex G resistors with the technical characteristics of Gridex N and F resistors. Gridex U resistors consist of solid strips, in an extended diamond mesh shape with lateral stiffeners.

gridexnf1 TechnologiesGRIDEX N & F:Gridex N and F resistors are designed to optimise the dissipation of heat caused by electrical current into the surrounding environment (i.e. non-adiabatic heating). Gridex N resistors are intended for natural ventilation, Gridex F resistors for forced ventilation.

gridexg1 Technologies

When a resistor is required not to produce any significant heat exchange with the surrounding environment (i.e. be subject mainly to adiabatic heating), it should have as great a mass as possible. Gridex G resistors meet this requirement and are constructed of steel sheet elements cut into rectangles and mounted in a staggered configuration.

gridext1 TechnologiesGRIDEX T:
The Gridex T resistors are made of woven resistive elements. The thread in one direction is not conductive whereas the thread in the other direction is resistive. This technology can provide high resistance values (reaching hundreds of ohms) and can be adapted to high voltage applications (both continuous and transient).

LIQUID RHEOSTATS

vectrostarr1 TechnologiesVectrostar R :
The Vectrohm electrolytic starters are rheostats that always work in the liquid phase. This technology provides a continuous and progressive variation of resistance allowing motors to be started very gently.

Resarch and development

Resarch and development

  • An integrated designing team composed of graduate engineers who knows the industrial context in which the resistors will be installed.
  • With an organization structured and effective whose essential objective is the satisfaction of our customers, from the study to the delivery.
  • With our applied research laboratory, nwe are able to perform thermal and mechanical tests as well as to get electric and dielectric measurements up to 150 kV. All our resistors are final-checked on a test bank.

LABO Resarch and development

Laboratoire d’essais et R. & D.

Recherchetdveloppement Resarch and development

Temperature-rise tests

edf Resarch and development
cesi Resarch and development

Contact us

METAL DEPLOYE RESISTOR

1 Route de Semur

BP150 21500 MONTBARD

FRANCE

TEL. : 00 33 (0)3 80 89 58 58
FAX : 00 33 (0)3 80 92 24 33
E.mail : info [at] mdresistor.com

COMMERCIAL DEPARTMENT : TEL. : 00 33 (0)3 80 89 58 75   /  00 33 (0)3 80 89 58 75
CUSTOMER DEPARTMENT : TEL. : 00 33 (0)3 80 89 58 74 /  00 33 (0)3 80 89 58 74

HOW TO FIND US ?

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Company profile

METAL DEPLOYE RESISTOR has been manufacturing power resistors since 1938.

By constantly improving the quality and innovation of our products, we are able to
meet our customer requirements as closely as possible.

Our team of 65 people including 25 engineers operates in the following fields: research and development,design, manufacturing, testing, sales and after-sales service.

resistances home MDR uk 2 Company profile

Heating Elements

deshydratation Heating Elements The use of metal resistors with predictable thermal inertia makes it possible to generate heat with a high degree of accuracy. In addition they do not pollute their surrounding gas which may, for example, be used to dehydrate medicines, chemicals or food.
For these reasons, modern industries are increasingly turning towards heat generation using resistors.

Dehydration of plants at an agricultural cooperative. Power. 16 MW.
Flow 65 tonnes/h of a air-steamer mixture of water with 700°C

Braking resistors

On electrical locomotives braking is achieved by both mechanical brakes (drums & disks) and electrical brakes, which are usually high performance rheostat type resistors. Gridex resistors equip the French high speed train, the TGV, which requires a powerful braking system, and other types of transport such as local trains and trams which have frequent braking cycles.

traction 300x225 Braking resistors

Load banks

Power resistors are used in generator load banks to avoid fouling of the diesel engine when the generator is operating at low power.
In addition, it is standard practice to use power resistors as load banks to maintain batteries in electrical laboratories, industrial testing facilities and telecommunications facilities.

We offer inductive load banks that can vary their power factor between 0.8 and 1.

Compact, ergonomic, silent and modular, the new models in our wide range have increased reliability which will help to maintain the excellent reputation of METAL DEPLOYE RESISTOR, built up over the last 70 years

STANDARD PRODUCTS
charge 5kw detouree2 250x178 Load banks
15 kW under 400 V
Natural cooling		 NATURAL COOLING SERIE  :

  • Natural convection cooling
  • Power from 5 to 120kW in a single frame
  • Connection on the lower part of the unit (the cooler area)
  • IP13 ingress protection rating (normal outdoor use)
  • Options: terminals rail (DIN), IP23 protection, castor wheels.
jubaili detoure1 250x187 Load banks

600 kW Load bank with control cabinet

standard trailer8 250x250 Load banks

standard trailer

 FORCED AIR COOLING SERIES – 400, 700 AND 800:

  • Horizontal forced air cooling
  • Power from 50 to 1200 kW in 10 kW steps
  • Low noise helical fan with motor rated to IP54
  • Secure contacts, controlling the ventilation
  • Options : lateral terminal bar, castor wheels, double insulation, control cabinet, trailer.
SPECIFIC PRODUCTS

Our modern techniques and tools (CAS, finites elements analysis, internal test facility for heating and vibration) enable us to design customised equipment :

edf dampierre detoure1 300x171 Load banks
4 MW load bank under 6.6 kV
  • Load banks to meet any power requirement,
  • High voltage
  • Vertical forced cooling,
  • Centrifugal fan
  • Additional reactive loads
  • “Tunnel” resistor for use in the air duct of electrical generators
  • Control cabinet, automatic load shedding

Motor Control Resistors

Resistors make an important contribution to the control of high power electric motors and are used for starting, braking and speed control.Their main role is to limit the starting current for motors used in applications such as compressors, pumps and ventilators. Simplicity, reliability and strength, are the main requirements of resistors used with electronic systems.

motor control 250x187 Motor Control Resistors

Motor control resistor
Casablanca Harbour (Morrocco)
resistance de demarrage rotorique Motor Control Resistors
Rotoric resistor

For more details, please do not hesitate to contact us us or ask us for a quote

Neutral Grounding Resistors

 

filtrage modifi Neutral Grounding ResistorsMost power distribution networks have their neutral line connected to earth in order to support important currents if a fault occurs.

In order to avoid the potential damage such faults can create, a neutral earthing resistor (or neutral grounding resistor) is fitted between the neutral and earth in order to limit the current and give automatic electrical protection devices enough time to react.



A Wide Modular Range :

The experience METAL DEPLOYE RESISTOR has gained by installing thousands of neutral earthing resistors around the world together with the flexibility of our technology and the robustness of our products allow us to meet a large range of requirements.malt standard4 226x300 Neutral Grounding Resistors

Power resistors that we have developed include:

Electrical:

  • Rated fault current : from 5 to 5000A.
  • Rated voltage : from 380V to 500kV (with adequate isolation).
  • Rated fault time : from several seconds to permanent fault condition.

Mechanical:

  • Direct connection or through porcelain bushing or using plugs.
  • Ingress protection: from IP00 to IP54 (we recommend IP23)
  • Finishing : pre-galvanized, hot-dip galvanized, painted, stainless steel housing or other as required by the customer.neutral grounding resistor 250x250 Neutral Grounding Resistors

Options :

  • HV  LV current transformers.
  • Off-load or on-load disconnecting switches,
  • Space heater,
  • Isolators allowing the connection of several sources to the same resistance
  • Elevating stands,
  • Bushing cable boxes.

We are extremely flexible and are able to offer customised solutions.  For example in order to meet specific customer requirements, we have designed and supplied control cabinets that include switch and current transformers for connecting one or several transformers to the same resistance.  We have also supplied cabinets that include inverters.

Click here for Technical Data bancs de chargeneutral earthing resistorneutral grouding resistorload banks résistances de point neutre résistances de mise à la terrerésistances pour filtres SVC rotorique2 Neutral Grounding Resistors
To discuss any aspects of your neutral earthing resistor requirements, do not hesitate to contact us or simply ask for a quote.

neutral earthing resistor; neutral grounding resistor; neutral earthing resistors: neutral grounding resistors;;neutral earthing resistor; neutral grounding resistor;neutral earthing resistor; neutral grounding resistor

Localization

METAL DEPLOYE RESISTORmetal deploye resistor montbard Localization

ROUTE DE SEMUR – BP 150

21500 MONTBARD – FRANCE

Tél. : 00 33 (0)3 80 89 58 58

Fax : 00 33 (0)3 80 92 24 33

E.mail : info@mdresistor.com

See on GoogleMap here

By A6 highway :
Direction Paris/Lyon A6 : Exit No. 23 “Bierre les Semur”

Hotels at Montbard and Semur En Auxois (18km from Montbard) :

Hôtel de l’Ecu Montbard***
7, rue Auguste Carré
21500 MONTBARD
Tél. : 00 33 (0)3 80 92 11 66

Hostellerie d’Aussois***
Route de Saulieu
21140 SEMUR EN AUXOIS
Tél. : 00 (0)3 80 97 28 28

Hôtel Bar Neptune Montbard **
Quai Phillipe Bouhey
21500 MONTBARD
Tél. : 00 33 (0)3 80 92 59 49

Hötel de la Gare Montbard**
10 rue Maréchal Foch
21500 MONTBARD
Tél. : 00 33 (0)3 80 92 02 12