GE Multilin G650, Manual

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GEK-113285A G650 Generator Protection & Control System 5-65
5 SETTINGS 5.4 PROTECTION ELEMENTS
5
Table 5–65: 27P ELEMENT SETTINGS
Phase undervoltage element settings are:
Function Permission (Function):
This setting indicates whether the phase undervoltage element is enabled or disabled.
Input mode (Mode):
This setting allows selecting operation for phase-to-phase or phase-to-ground voltage,
depending on the selected setting.
Pickup Level:
This is the voltage threshold below which the undervoltage element will operate.
Curve Shape (Curve):
Undervoltage elements can be set to operate with definite time or with an inverse time
curve. Elements set as definite time operate when the voltage value remains under the
pickup setting during the set time. If inverse time is selected, the element will operate
according to the previously described inverse time curve.
Time Dial (Delay):
Setting of the Protection element operation time.
Minimum voltage Threshold (Minimum Voltage):
Voltage setting under which the undervoltage element is inhibited, in
order not to operate in dead line cases.
Operation logic (Logic):
This setting allows the element operation logic selection:
ANY PHASE The element will operate under an undervoltage condition in any of the
three phases.
TWO PHASES The element will operate under an undervoltage condition in at least two
phases.
ALL PHASES The element will operate under an undervoltage condition in the three
phases.
Supervision by breaker status (Supervised by 52):
This setting allows inhibiting the undervoltage element if the breaker
is open breaker. In case this setting is enabled, the undervoltage element will be
supervised by the breaker status. Otherwise, the element will operate independently of
the breaker status.
Snapshot Events:
The snapshot event setting enables or disables the snapshot event generation for this
element.
5.4.9.2 PHASE OVERVOLTAGE ELEMENT (59P)
The Phase overvoltage element may be used as an instantaneous element with no intentional time delay or as a Definite
Time element. The input voltage is the phase-to-phase voltage, either measured directly from Delta-connected VTs or as
calculated from phase-to-ground (wye) connected VTs. The time delay can be set from instantaneous to 900 seconds. The
element reset can be delayed up to 900 seconds.
As in the case of the undervoltage element, this element generates independent pickup and trip signals for each phase.
The general signal is selectable by setting to be an OR or an AND of the phase signals.
SETPOINT > PROTECTION ELEMENTS > VOLTAGE ELEMENTS > PHASE UV >
PHASE UV 1> PHASE UV 2 > PHASE UV 3
SETTING DESCRIPTION NAME DEFAULT
VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Input mode Mode PHASE-PHASE N/A [PHASE-PHASE, PHASE-GROUND]
Pickup Level Pickup Level 10 1 V [3 : 500]
Curve shape Curve DEFINITE TIME N/A [DEFINITE TIME – INVERSE TIME]
Time Dial Delay 10.00 0.01 s [0.00 : 900.00]
Minimum Voltage Threshold Minimum Voltage 5 1 V [0 : 500]
Operation logic Logic ANY PHASE N/A [ANY PHASE – TWO PHASES – ALL PHASES]
Supervision by breaker status Supervised by 52 DISABLED N/A [DISABLED – ENABLED]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]