Description

ABB VHXM22B Static Protection Relay

ABB VHXM22B Static Protection Relay – Under voltage relay with variable time delay

Technical Specification of ABB VHXM22B Static Protection Relay

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

Application
The relay type VHXm is a static under/over voltage relay used for detection of under voltage (or loss of voltage) or over voltage in the AC system. Relay is used for over voltage protection and supervision in distribution systems. Relay is also used for overvoltage / undervoltage protection of Generators, Motors and Transformers.

Design and principle
The VHXm is a AC voltage measuring relay. Different versions are available for a) Fixed voltage setting with instantaneous operation b) Variable voltage setting with or without variable time delayed operation. The AC voltage to be measured is applied at terminal 3 and 4. The input voltage is isolated, scaled and suitably conditioned for measurement.
Operating voltage level and time delay can be set with the potentiometer on the front-panel of the relay.
The product of the potentiometer setting and multiplier (marked) is the set operate time for relay.
The VHXm is powered by a DC auxiliary supply. The relay has a built-in electro-mechanical output relay providing medium duty contacts. The output relay also has one red hand reset flag. The relay is available in draw-out type flush
mounting model.

STATIC PROTECTION RELAY PRODUCT RANGE

• VHXm22A (40-80% of Un Under voltage, W/O time delay)
• VHXm22B (40-80% of Un Under voltage, with variable time delay)
• VHXm23A (80-140% of Un Over voltage, W/O time delay)
• VHXm23B (80-140% of Un Over voltage, with variable time delay)
• IRXm

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