ABB UVT92M Supervision Relay- Fuse failure relay

ABB UVT92M Supervision Relay, the fuse failure relay is a high speed static relay intended for continuous monitoring of fuses against blowing out or inadvertent removals. This relay can be used for one, two or all three phase fuse failure detection. The plug-in socket type design for terminals, supports ease of installation and maintenance.

Technical Specification

• Type: Electro Mechanical Relay.
• Protection Type: Supervision Relay.

UVT92M fuse failure relay Features

• Fast operation
• 1, 2 or 3 phase fuse fail detection
• No continuous drain on D.C. auxiliary supply
• Hand reset LED operation indication
• Sensitivity down to 2.5VA load on secondary

Application
The fuse failure relay is intended for continuous monitoring of fuses against blowing out or inadvertent removals. In application where failure or inadvertent removal of fuse may cause incorrect tripping.
The relay can also be used for supervision of potential transformer fuses so as to give blocking signals to voltage operated protection schemes such as distance protection, under impedance and under voltage relays. It can be used for alarming purpose in synchronizing circuits.

Design and principle of operation
The fuse failure relay is a high speed static relay with built-in electro mechanical output relays providing two change over signaling duty contacts. The relay can operate for single, two or three phase fuse failure in secondary circuit.
During the normal operation, the potential across the fuses is nearly zero. When fuse fail will occur in any of the phase, the potential across the particular fuse goes up. This potential drives the circuit path for external LED indication and relay output.

The fuse fail in any phase is indicated by ‘Trip’ LED and will remain latched until reset push button is pressed and fuse is healthy. After replacing the faulty fuses, the output contacts can be reset. The plug in socket design for terminals facilitates ease of installation and maintenance. The relay is suitable for flush mounting on panel and is
sufficiently protected against any ingress. A unique Plug-in PCBA assembly and sheet metal case makes the relay robust and light weight.