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GE UR Series Instruction Manual Page 148

Line differential relay.
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5.5 GROUPED ELEMENTS
PHS DIST Z2 REACH:
This setting defines the zone reach. The reach impedance is entered in secondary ohms. The reach impedance angle is
entered as the
PHS DIST Z2 RCA
PHS DIST Z2 RCA:
This setting specifies the characteristic angle (similar to the "maximum torque angle" in previous technologies) of the phase
distance characteristic. The setting is an angle of reach impedance as shown in MHO DISTANCE CHARACTERISTIC and
QUAD DISTANCE CHARACTERISTIC figures.
This setting is independent from
PHS DIST Z2 COMP LIMIT:
This setting shapes the operating characteristic. In particular, it produces the lens-type characteristic of the MHO function
and a tent-shaped characteristic of the reactance boundary of the quad function.
If the mho shape is selected, the same limit angle applies to both the mho and supervising reactance comparators. In con-
junction with the mho shape selection, the setting improves loadability of the protected line. In conjunction with the quad
characteristic, this setting improves security for faults close to the reach point by adjusting the reactance boundary into a
tent-shape.
PHS DIST Z2 DIR RCA:
This setting select the characteristic angle (or "maximum torque angle") of the directional supervising function. If the mho
shape is applied, the directional function is an extra supervising function as the dynamic mho characteristic itself is a direc-
tional one. In conjunction with the quad shape selection, this setting defines the only directional function built into the phase
distance element. The directional function uses the memory voltage for polarization.
This setting typically equals the distance characteristic angle
5
PHS DIST Z2 DIR COMP LIMIT:
This setting selects the comparator limit angle for the directional supervising function.
PHS DIST Z2 QUAD RGT BLD:
This setting defines the right blinder position of the quad characteristic along the resistive axis of the impedance plane (see
the QUAD DISTANCE CHARACTERISTIC figure). The angular position of the blinder is adjustable with the use of the
DIST Z2 QUAD RGT BLD RCA
This setting applies only to the quad characteristic and should be set giving consideration to the maximum load current and
required resistive coverage.
PHS DIST Z2 QUAD RGT BLD RCA:
This setting defines the angular position of the right blinder of the quad characteristic (see the QUAD DISTANCE CHARAC-
TERISTIC figure). This setting applies only to the quad characteristic.
PHS DIST Z2 QUAD LFT BLD:
This setting defines the left blinder position of the quad characteristic along the resistive axis of the impedance plane (see
the QUAD DISTANCE CHARACTERISTIC figure). The angular position of the blinder is adjustable with the use of the
DIST Z2 QUAD LFT BLD RCA
to the maximum load current.
PHS DIST Z2 QUAD LFT BLD RCA:
This setting defines the angular position of the left blinder of the quad characteristic (see the QUAD DISTANCE CHARAC-
TERISTIC figure). This setting applies only to the quad characteristic.
PHS DIST Z2 SUPV:
The phase distance elements are supervised by the magnitude of the line-to-line current (fault loop current used for the dis-
tance calculations). For convenience,
threshold setting is multiplied by
If the minimum fault current level is sufficient, the current supervision pickup should be set above maximum full load current
preventing maloperation under VT fuse fail conditions. This requirement may be difficult to meet for remote faults at the end
of Zone 2. If this is the case, the current supervision pickup would be set below the full load current, but this may result in
maloperation during fuse fail conditions.
5-64
setting.
, the characteristic angle of an extra directional supervising function.
PHS DIST Z2 DIR RCA
setting.
setting. This setting applies only to the quad characteristic and should be set with consideration
3
is accommodated by the pickup (i.e., before being used, the entered value of the
3
).
L90 Line Differential Relay
.
PHS DIST Z2 RCA
5 SETTINGS
PHS
PHS
GE Power Management

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L90

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