Pulsed Outputs - GE 845 Instruction Manual

MONITORING

Pulsed Outputs

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The 845 relay provides a Pulse Output element for four energy measurements. The
element can operate auxiliary relays after an adjustable energy increment for the
quantities of positive and negative MWatthours and positive and negative MVARhours.
Pulses occur at the end of each programmed energy increment. Upon power-up of the
relay, the Pulse Output function, if enabled, continues from where it was at the time of loss
of control power. For example, if control power is removed when the positive Watthours
stored at last pulse was 24.000 MWh, when control power is re-applied a pulse occurs at
34.000 MWh if the energy increment is set at 10.000 MWh.
1. The Auxiliary Output relay(s) used for this element must be set to "Self-Resetting"
under Aux Output relays. The pulses consist of a one second on-time and a one
second off-time. This feature is programmed such that no more than one pulse per
two seconds is required.
2. The 845 is not a revenue class meter and cannot be used for billing purposes.
Energy quantities are displayed in MWh and MVarh, with resolutions of 1 kWh and 1 kVarh
respectively.
Path:
Setpoints > Monitoring > Functions > Pulsed Outputs > Pulse Output
FUNCTION
Range: Disabled, Enabled
Default: Disabled
POS WHS PULSE INCREMENT
Range: 0.000 to 1000.000 MWh in steps of 0.1 MWh
Default: 10.000 MWh
The setpoint specifies the positive Watthours threshold pulse increment after which the
output pulse and output operand are set.
POS WHS PULSE RELAYS 3 to 7
Range: Do Not Operate, Operate
Default: Do Not Operate
The operation of these output relays is programmed by the user.
NEG WHS PULSE INCREMENT
Range: 0.000 to 1000.000 MWh in steps of 0.1 MWh
Default: 10.000 MWh
The setpoint specifies the negative Watthours threshold pulse increment after which the
output pulse and output operand are set.
NEG WHS PULSE RELAY 3 (X)
Range: Do Not Operate, Operate
Default: Do Not Operate
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS