KPV12x - NEUTRAL DISPLACEMENT AC EARTH FAULT GUARD
- Insulation monitoring and Earth Fault Protection of live non-grounded low or high tension AC supplies
- Direct connection to Neutral in up to 690VAC supply networks
- Triple relay operation gives more flexibility
- Very fast analogue output signal proportional to meter reading (<50mS), (F-version)
KPV12x is a digitally controlled two-level trip relay monitoring the insulation status of a live AC system, by detecting the displacement of the voltage between the supply system neutral point and PE.
The level of neutral point voltage will depend on the level of earth fault between each line voltage and PE. In a fault free system the voltage will be nil, if one line voltage is grounded to PE the voltage may increase to Vn/√3 (approx. 400V for a 690V system).
KPV12x is available for direct connection to nominal 115, 230, 440 or 690VAC system voltage, with 100, 200, 400 or 500V meter range respectively. Use 115V input for transformer connection to higher voltage.
An auxiliary voltage is required for the unit. A green LED indicates POWER on. Start of monitoring function is delayed when power is switched on (default 2 secs delay). In this way false tripping during power up is avoided. The meter reads the neutral point voltage, and has low-reflection glass to ease reading at a distance.
The triple-zone status LEDs at a glance gives the clear safety message:
The standard E-version has no analogue output. The optional F-version has an isolated analogue output signal proportional to meter deflection.
The units three C/O relay outputs are configured for Warning trip (R2), Alarm trip (R1) and trip Status (R3). The trip levels and trip delays are user settable on unit rear to suit most applications. The Status relay is fail to safety configured, and operates when either R1 or R2 trips. Operation of the status trip relay is inverted (fail safe), i.e. the relay is energised during normal conditions.
Red relay trip lamps flash instantly (approx. 1 flash per second) on passing a trip. The lamp changes state and the trip relay operates after the pre-set delay. If a trip condition ends during the delay interval, the timer will automatically reset. As standard the unit is supplied for automatic reset.
The unit meets EN 61010-1 Cat. III, Pollution degree 2 and the relevant
environmental and EMC tests specified in EN 61326-2-4 to comply with the
requirements of the major Classification Societies.
