- 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 kVAr-signal output, <50mS
- Wide range setting of overload contact hysteresis
Application
The digital controlled KPVA17x 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 kVAr-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.
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.
Description
KPVA171C - KPVA171H & KPVA176A - KPVA176H
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.
KPVA176A & KPVA176H have analogue output proportional to the generator kVAr-load.
KPVA171F & KPVA171HF - KPVA176F & KPVA176HF
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.
KPVA176F & KPVA176HF have analogue output proportional to the generator kVAr-load.
KPVA174C - KPVA174H & KPVA177A - KPVA177H
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.
KPVA177A & KPVA177H have analogue output proportional to the generator kVAr-load.
KPVA174F & KPVA174HF - KPVA177F & KPVA177HF
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.
KPVA177F & KPVA177HF 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.
