Whitepaper – DC Fault Detection with VSDguard and ELV Relays

Variable Speed Drives (VSDs) use variable frequency outputs that are produced by rectifying the supply to dc and then inverting this dc voltage back into ac using a high frequency carrier and pulse width modulation (PWM) to produce variable frequency, variable voltage supply to the motor. The consequence of introducing a dc bus into the system is that there is now a possibility of the occurrence of dc earth faults. This paper will demonstrate how a fault on the dc bus of a variable speed drive can be detected using a wideband earth leakage relay coupled with an earth leakage toroid.

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Technical Datasheet – ELV-Pro Analyser

Ampcontrol’s ELV-PRO is 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.

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Technical Data Sheet – ELV Relay

The Ampcontrol ELV is the next generation of earth leakage relays and provides wide bandwidth earth leakage protection (earth fault protection) as per AS/NZS 2081:2011. It has been designed for use on earth fault-limited systems, and particularly coal mining applications. The relay is also suitable for other applications where equipment or system-wide earth leakage protection is required.

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Application Note – ELV-PRO Equipment Update

The ELV-PRO relay is a successor to the VSD-Guard, a premium Earth Leakage Relay providing users with a greater visibility and insight into the earth leakage currents within their system. In recent months a number of concerns have been raised regarding the relay experiencing nuisance tripping. The concerns identified with the product do not prevent the ELV-PRO detecting Earth Leakage faults; rather users may experience nuisance tripping. The relay does not present a safety risk with all trips / failures resulting in a safe failure condition.

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User Manual – ELV-Pro Analyser

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.

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