Positive-Sequence Voltage Functions - GE ALPS Instruction Manual

2.3 PROTECTION SETTINGS
The settings in this section apply to overvoltage models only
NOTE
The ALPS can be supplied with positive-sequence overvoltage functions if desired. Two types are provided:
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1. An uncompensated overvoltage function (V1OVER) that operates on positive sequence voltage alone:
V1OVER = V
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2. A compensated overvoltage function (V1COMP) that operates on positive sequence voltage and a compensating volt-
age that is related to the positive sequence current and a compensating impedance:
V1COMP = V - ( I
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where V = positive sequence voltage at the relay
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I = positive sequence current at the relay
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Z = compensating positive sequence impedance
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The uncompensated function responds to the positive-sequence voltage developed directly at the relay location. The com-
pensated function responds to the positive-sequence voltage at some point ( Z
example, if Z is set equal to the positive-sequence impedance of the protected line, then V1COMP measures the posi-
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tive-sequence voltage developed at the end of the line remote from the relay.
705: V1OVER - Select Positive Sequence Overvoltage
If the uncompensated positive sequence voltage function is to be used, set V1OVER = YES. Otherwise, set V1OVER =
NO.
706: V1OVINSTPU - Instantaneous Positive V1OVER Pickup
V1OVINSTPU establishes the pickup setting of the instantaneous V1OVER function and can be set from 1.0 to 1.4 per unit
volts based on the RATEDVOLTS setting. If V1OVER is selected, make a V1OVINSTPU setting that is suitable to the par-
ticular application.
707: V1OVTIMPU- Time Positive Sequence Overvoltage Pickup
V1OVTIMPU establishes the pickup setting of the time delayed V1OVER function and can be set from 1.0 to 1.4 per unit
volts based on the RATEDVOLTS setting. If V1OVER is selected, make a V1OVTIMPU setting that is suitable to the partic-
ular application.
708: V1OVTIMDLY - Positive Sequence Overvoltage Time Delay
V1OVTIMDLY establishes the time delay to be used with the time delayed positive sequence overvoltage function and can
be set from 0 to 10.0 seconds. If V1OVER is selected, make a V1OVTMDLY setting that is suitable to the particular applica-
tion.
709: V1COMP - Compensated Positive Sequence Overvoltage Function
If the compensated positive sequence voltage function is to be used, set V1COMP = YES. Otherwise, set V1COMP = NO.
710: V1COMPRCH - V1COMP Impedance
V1COMPRCH establishes the point (in positive- sequence Ω) in front of the relay where the positive-sequence voltage will
be measured. If V1COMP is selected, set V1COMPRCH to suit the particular application.
711: V1COMPINPU - V1COMP Instantaneous Pickup
V1COMPINPU establishes the pickup setting of the instantaneous V1COMP function and can be set from 1.0 to 1.4 per
unit volts based on the RATEDVOLTS setting. If V1COMP is selected, make a V1COMPINPU setting that is suitable to the
particular application.
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x Z )
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ALPS Advanced Line Protection System
2 CALCULATION OF SETTINGS

2.3.9 POSITIVE-SEQUENCE VOLTAGE FUNCTIONS

ohms) in front of the relay location. For
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