Ampcontrol has recently been made aware of a condition that causes the ELD V3 and ELV V2 relays to power up into a tripped state. The trip is related to the internal charge of the super-capacitor. The issue may cause delayed power up of equipment as a reset will be required if a trip occurs.
The cause of this trip is not a safety concern nor will it pose any risks to operations experiencing this condition. The trip was detected during the commissioning stage where the equipment was undergoing repetitive power cycles.
If your installation is experiencing nuisance tripping due to DC offset sources, and you are not required to use Earth Continuity Protection for touch potential safety, then the following application note may be a suitable solution. The ECM3 Earth Continuity Relay utilises a DC sense signal to determine the Pilot Series and Shunt Resistance. In some applications where the relay is exposed to DC offset sources (i.e. when exposed to a cathodically protected wharf or pontoon to fight against corrosion), the applied DC source can interfere with the relay’s sensing ability.
The Ampcontrol ELM V2 earth leakage relay has been designed and approved for use on earth fault limited systems providing earth leakage protection (earth fault protection). The relay is also suitable for other applications where equipment or system earth leakage protection is required.
The Ampcontrol ELD V3 earth leakage relay has been designed and approved for use on earth fault limited systems, namely coal mining applications, providing earth leakage protection (earth fault protection) as per AS/NZS 2081:2011. The relay is also suitable for other applications where equipment or system earth leakage protection is required.
The Ampcontrol ELM V2 Earth Leakage Relay is electronic in design and is based on microprocessor technology. The earth fault current is measured using a toroid, with the trip time and trip threshold being able to be independently adjusted using selectors on the relay fascia. When a fault occurs and the trip level and time delay is exceeded the relay‟s trip function is activated. A trip will de-energise the trip contacts connected in the system control circuit. The trip condition is latched in non-volatile memory and requires operation of the reset input to clear the trip condition. An internal reset is also provided on the fascia of the relay.
Some of the relays components are experiencing obsolescence issues, and have been updated to ensure continued production. New item numbers for the current discrete Earth Leakage Relays have been allocated to facilitate these changes. The functionality, form and fitment of these relays remains unchanged
The OTS System is installed into Ampcontrol Substations, Distribution Boards and Outlet Control Boxes. The OTS greatly simplifies the statutory testing process, performing a hands-free, automated testing function whilst simultaneously providing a comprehensive record management tool.
User Manual forAmpcontrol’s ELV-PRO, a high performance, microprocessor based, wide bandwidth earth leakage protection relay that is capable of measuring and analysing power and switching frequency currents flowing in IT power systems. The ELV-PRO uses patented technology (US20130258537) to characterise earth leakage currents giving superior fault discrimination.
A number of Ampcontrol electrical protection relays which have already been made obsolete, and not manufactured for some time, will no longer be repaired (WN-2016-04). This is because a number of critical components required for repair are no longer available. The effected products are outlined in the notice along with the replacement series (if applicable).
In an industry where safety is paramount, Ampcontrol has a proven track record of delivering products to suit the unique system challenges and hazards of hard rock mining applications. Our comprehensive and cost effective range of electrical protection relays ensure safe and stable electrical systems.