- Precision Generator AVR Reactive Power Guard, not affected by heavily distorted waveforms
- Total processing time less than 50mS
- Available for 3-phase, 3-wire (2W3) or 4-wire (3W4) systems
- 2-level overload protection (F version)
Up to two individual very fast analogue output signals (<50mS), (optional)- Wide range setting of overload contact hysteresis
- DIN96 Slave Indicator with status LEDs (optional)
Description
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.
It can also be delivered with optional separate AC or DC auxiliary voltage (terminal 26 & 27), but that must be specified when ordering.
User settable trip levels and delays. Colour of LEDs indicate alarm status. Alarm LEDs flash during count-down.
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 DIN-rail mounted 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
Outputs
Up to two individual very fast analogue output signals (optional) proportional to kVArr range. This may be used as an input to a control system, to detect abnormal power conditions (loss of excitation etc). If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.
Relay Outputs
Relay operation depends on the selected model. Other combinations are available on request.
Description
KCVA171C - KCVA171H - KCVA176AA - KCVA176AB - KCVA176HA - KCVA176HB
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.
KCVA171F - KCVA171HF - KCVA176FA - KCVA176FB - KCVA176HFA - KCVA176HFB
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.
KCVA174C - KCVA174H - KCVA177AA - KCVA177AB - KCVA177HA - KCVA177HB
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.
KCVA174F - KCVA174HF - KCVA177FA - KCVA177FB - KCVA177HFA - KCVA177HFB
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.
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.
