METAL DEPLOYE RESISTOR offers tailor-made earthing resistors (MALT) for advanced electrical production and distribution systems.
Even more specifically, in the contextapplications dedicated to naval applications :
- harbor equipment,
- stopover ship supply
For efficient energy management, the earthing resistors – MALT from METAL DEPLOYE RESISTOR provide:
- Reliability
- Agility
- security
Earthing resistance (MALT)
What is the principle of safety for the earthing resistors installed on ports and quays for naval ships calling?
The danger of equalization currents between ships and the loading dock occurs by electrochemical processes, independent of filling.
The ship, the metal construction of the loading dock and the water as electrolyte between them form a galvanic cell .
There is a voltage difference between the electrodes of this cell. Any conductive connection between the electrodes will lead to a undefined flow of electric current .
This current flow can cause hot spots at connection points and generate sparks while disconnecting the inductive elements. These sparks could cause a lethal ignition in hazardous areas.
The effect of a potential difference takes place as soon as the vessel has been moored, and not just during loading and unloading. To avoid such unregulated current flow, different guidelines for tankers and terminals specify to electrically isolate the vessel from shore.
Typically, non-conductive flanges are used to insulate vessels from shore, to account for the physical effect. However, there are still risks that a conductive connection be created by chance (with walkways, with metal ropes or tools). This risk is related to a combination of factors during the total uptime of the terminal and the variety of vessel loading processes.
The naval earthing system
A controlled high conductivity potential equalization link, such as a marine earthing system is recommended.
The earthing system for a ship-to-shore connection is an effective method of risk reduction and explosion protection in addition to flange insulation. This system ensures a higher level of safety on the ship and on land.
Connection to shore power
Many ships are equipped with a shore power supply system in order to be supplied with electricity during stopovers in ports. Polluting emissions and noise pollution are thus reduced. It is also a step forward towards the decarbonisation of ports, driven by regulations which have for many years been strengthening the requirements in terms of emissions linked to transport.
The earthing resistors fully play their role of:
- security equipment and intervention personnel
- Global legislative standardization
- Environmental protection
- Technical performance in a demanding and restrictive environment
METAL DEPLOYE RESISTOR, is at your disposal to define the specific parameters related to your needs via a wide modular range of earthing resistors.
Our range of resistors meets the international standards .
