KCW17x Series

KCW17x - 3-PHASE GENERATOR REVERSE POWER AND OVERLOAD GUARD
  • Precision Generator kW Load Protection, 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 KCW17x range provides precision (1.0%) reverse power and overload protection and monitoring of three phase generators.
 
Available for 3-phase 3-wire (2W3) and 4-wire (3W4) 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 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 DIN-rail mounted instrument reads the power level directly in kW. The 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
KCW171C - KCW171H & KCW176A - KCW176H
Configuration: 3-Phase, 3-Wire (2W3)
Meter: Bi-Polar 1Reverse power relay (R3) is used to trip the generator breaker. The overload relay (R1) can be used for non-essential load release or as start signal to standby generator etc. A wide range overload hysteresis can be set to enable R1 to be used for non-essential load to be reconnected or as standby generator stop signal.

Relay R2 is intended for notification of a reverse power condition, or can be used for local indication, as input to an alarm system etc. R2 and R3 will latch after trip.

KCW176A & KCW176H have analogue output proportional to the generator kW-load.
 
KCW171F & KCW171HF - KCW176F & KCW176HF
Configuration: 3-Phase, 3-Wire (2W3)
Meter: Bi-Polar 1

Reverse power relay (R1) is used to trip the generator breaker. The two individual settable overload relays (R2 and R3) can be used for non-essential load release or as start signal to standby generator etc.

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

KCW176F & KCW176HF have analogue output proportional to the generator kW-load.

KCW172A & KCW178A
Configuration: 3-Phase, 3-Wire (2W3)
Meter: Bi-Polar 2

The overload relay (R2) can be used for non-essential load release or as start signal to standby generator etc. A wide range adjustment for overload contact hysteresis can be set to enable R2 to be used for non-essential load to be reconnected or as standby generator stop signal.

Reverse overload relay (R1 & R3) is reverse over load protection when generator is running as motor. Reverse power relays can be used for generator trip, local indication, alarm system etc.

KCW178A have analogue output proportional to the generator kW-load.
NB! Meter and relay range is +/-100%.

KCW172B & KCW178B
Configuration: 3-Phase, 3-Wire (2W3)
Meter: Bi-Polar 2
The overload relay (R2) can be used for non-essential load release or as start signal to standby generator etc. A wide range adjustment for overload contact hysteresis can be set to enable R2 to be used for non-essential load to be reconnected or as standby generator stop signal.

Reverse overload relay (R1 & R3 with different setting range) is reverse over load protection when generator is running as motor. Reverse power relays can be used for generator trip, local indication, alarm system etc.

KPW178B have analogue output proportional to the generator kW-load.
NB! Meter and relay range is +/-100%.

KCW174C - KCW174H & KCW177A - KCW177H
Configuration: 3-Phase, 4-Wire (3W4)
Meter: Bi-Polar 1

Reverse power relay (R3) is used to trip the generator breaker. The overload relay (R1) can be used for non-essential load release or as start signal to standby generator etc. A wide range overload hysteresis can be set to enable R1 to be used for non-essential load to be reconnected or as standby generator stop signal.

Relay R2 is intended for notification of a reverse power condition, or can be used for local indication, as input to an alarm system etc. R2 and R3 will latch after trip.

KCW177A & KCW177H have analogue output proportional to the generator kW-load.

KCW174F & KCW174HF - KCW177F & KCW177HF
Configuration: 3-Phase, 4-Wire (3W4)
Meter: Bi-Polar 1

Reverse power relay (R1) is used to trip the generator breaker. The two individual settable overload relays (R2 and R3) can be used for non-essential load release or as start signal to standby generator etc.

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

KCW177F & KCW177HF have analogue output proportional to the generator kW-load.

KCW175A & KCW179A
Configuration: 3-Phase, 4-Wire (3W4)
Meter: Bi-Polar 2

The overload relay (R2) can be used for non-essential load release or as start signal to standby generator etc. A wide range adjustment for overload contact hysteresis can be set to enable R2 to be used for non-essential load to be reconnected or as standby generator stop signal.

Reverse overload relay (R1 & R3) is reverse over load protection when generator is running as motor. Reverse power relays can be used for generator trip, local indication, alarm system etc.

KCW179A have analogue output proportional to the generator kW-load.
NB! Meter and relay range is +/-100%.

KCW175B & KCW179B
Configuration: 3-Phase, 4-Wire (3W4)
Meter: Bi-Polar 2
The overload relay (R2) can be used for non-essential load release or as start signal to standby generator etc. A wide range adjustment for overload contact hysteresis can be set to enable R2 to be used for non-essential load to be reconnected or as standby generator stop signal.

Reverse overload relay (R1 & R3 with different setting range) is reverse over load protection when generator is running as motor. Reverse power relays can be used for generator trip, local indication, alarm system etc.
KCW179B have analogue output proportional to the generator kW-load.
NB! Meter and relay range is +/-100%.

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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