KEV233x & KEV234x Series

 
KEV233x and KEV234x - THREE PHASE VOLTAGE GUARD
  • Precision Under/Over Voltage Protection, not affected by heavily distorted waveform
  • Voltage Imbalance Protection
  • 3- or 4- wire systems. Definite time trip delays
  • Pathfinder function identifies faulty phase
  • Complies with G59 requirements
  • Optional fast "highest up" analogue output (F-version)
Description
The digitally controlled KEV233x and KEV234x provide precision (0.5% repeatability) high/low line voltage and phase voltage protection respectively to any three phase generator or motor.

A digitally controlled voltage window discriminator controls operation and delay of the voltage low/high alarm relays. The unit measures the zero point crossing and the true r.m.s. voltage value, and accuracy is independent of any wave form distortion.

The auxiliary voltage is supplied from the unit voltage inputs. A DC or AC auxiliary voltage input is optionally available. A green LED indicates POWER on. Start of monitoring function is delayed when the power is switched on (default 2 secs delay). In this way false tripping during power up is avoided.

The voltmeter and the triple-zone status LEDs give the clear safety message:
  • HIGH ALARM
  • NORMAL
  • LOW ALARM
Red alarm lamps LOW (under voltage) and/or HIGH (over voltage) flash instantly (approx. 1 flash per second) on passing the lower and/or upper voltage differential set points. The lamp changes state and the trip relay operates after the pre-set delay. If a fault condition ends during the delay interval, the timer will automatically reset.

The voltage differential set points can be user-adjusted to suit most applications. Trip levels and delays are settable on unit rear. Operation of the status trip relay is inverted (fail safe), i.e. the relays are energised during normal conditions.

If one phase voltage is below the low trip level and, simultaneously, another phase voltage exceeds the high trip level then both relays will operate.

The class 1,5 moving iron DIN96 voltmeter must be connected directly to any phase or via a selector switch to read all three phases. The unit has low-reflection glass to ease reading at a distance.

The "Pathfinder" function identifies the phase(s) causing the trip by flashing pattern of the relevant LED(s).

The F-versions have an isolated output proportional to the at any time highest measured voltage.

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.
 
KEV233x - Three Phase 3-wire system
KEV234x - Three Phase 4-wire system
 
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