KCVA17x Series

KCVA17x - 3-PHASE GENERATOR REVERSE POWER AND VAR OVERLOAD GUARD
  • Precision Generator AVR Reactive Power Guard, not affected by heavily distorted waveforms
  • Total processing time less than 50mS
  • 3 or 4-wire systems. Definite time trip delays
  • 2-level overload protection (F version)
  • Optional fast analogue kW-signal output, <50mS
  • Wide range setting of overload contact hysteresis
  • Optional DIN96 Slave Indicator with status LEDs
Application
The digital controlled KCVA17x range provides precision (1.0%) reactive power and overload protection and monitoring of three phase generators. In cases where the AVR is failing - there will be an  increase or decrease in the exitation voltage from the AVR.

Increasing voltage give export (overload) kVAr and and decreasing voltage will give import (reverse) of kVar.

Available for 3-phase 3-wire (2R3) and 4-wire (3R4) systems.

The unit measures the voltage and current true r.m.s. value, and accuracy is independent of any wave form distortion.

As standard the auxiliary voltage is taken from the unit monitored voltage input. A separate AC or DC auxiliary voltage is optionally available.

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 DIN96 instrument reads the power level directly in kVAr. The optional slave watt-meter and the triple-zone status LEDs at a glance gives the clear safety message:
  • OVERLOAD
  • NORMAL
  • REVERSE POWER
Relay Outputs
Relay operation depends on the selected model. Other combinations are available on request.

Outputs
If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.
 
Description
KCVA171C - KCVA171H & KCVA176A - KCVA176H
Configuration: 3-Phase, 3-Wire (2R3)
Meter: Bi-Polar 1

Both the reverse power (Import) relay (R1) and the overload (export) relay R2 is used to trip the generator breaker.

Relay R3 is intended for notification of a reverse power condition, or can be used for local indication, as input to an alarm system etc. R1 and R3 will latch after trip.

R2 are non-latching and have a adjustable hysteresis.

KCVA176A & KCVA176H have analogue output proportional to the generator kVAr-load.

KCVA171F & KCVA171HF - KCVA176F & KCVA176HF
Configuration: 3-Phase, 3-Wire (2R3)
Meter: Bi-Polar 1
Both the reverse power (Import) relay (R1) and the overload (export) relay R3 is used to trip the generator breaker.

Relay R2 is intended for trip of non-essential load or tripping of bus-tie breaker to split up the system to reduce risk of total black out.

R2 and R3 are non-latching and have a 10% fixed hysteresis.

KCVA176F & KCVA176HF have analogue output proportional to the generator kVAr-load.

KCVA174C - KCVA174H & KCVA177A - KCVA177H
Configuration: 3-Phase, 4-Wire (3R4)
Meter: Bi-Polar 1
Both the reverse power (Import) relay (R1) and the overload (export) relay R2 is used to trip the generator breaker.

Relay R3 is intended for notification of a reverse power condition, or can be used for local indication, as input to an alarm system etc. R1 and R3 will latch after trip.

R2 are non-latching and have a adjustable hysteresis.

KCVA177A & KCVA177H have analogue output proportional to the generator kVAr-load.

KCVA174F & KCVA174HF - KCVA177F & KCVA177HF
Configuration: 3-Phase, 4-Wire (3R4)
Meter: Bi-Polar 1
Both the reverse power (Import) relay (R1) and the overload (export) relay R3 is used to trip the generator breaker.

Relay R2 is intended for trip of non-essential load or tripping of bus-tie breaker to split up the system to reduce risk of total black out.

R2 and R3 are non-latching and have a 10% fixed hysteresis.

KCVA177F & KCVA177HF have analogue output proportional to the generator kVAr-load.

Depending on application, select the model that matches the electrical installation.
If none of the listed models fit your purpose please contact Megacon for customer adaptation.

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