GE L60 Instruction Manual page 172

5.5 GROUPED ELEMENTS
The phase comparison tripping scheme menu provides the main setup for the phase comparison relay.
• 87PC SCHEME SELECT: Selects the Phase Comparison element scheme logic as follows:
2TL-TR-SPC-2FC: 2 terminal line, permissive tripping, single phase comparison, 2 frequency channel.
2TL-BL-SPC-2FC: 2 terminal line, blocking scheme, single phase comparison, 2 frequency channel.
2TL-UB-DPC-2FC: 2 terminal line, unblocking, dual phase comparison, 2 frequency channel (FSK PLC only);
2TL-TR-DPC-3FC: 2 terminal line, permissive tripping, dual phase comparison, 3 frequency channel.
2TL-BL-DPC-3FC: 2 terminal line, blocking scheme, dual phase comparison, 3 frequency channel.
3TL-TR-SPC-2FC: 3 terminal line, permissive tripping scheme, single phase comparison, 2 frequency channel
3TL-BL-SPC-2FC: 3 terminal line, blocking scheme, single phase comparison, 2 frequency channel carrier to
3TL-TR-DPC-3FC: 3 terminal line, permissive tripping scheme, dual phase comparison, 3 frequency channel
5
3TL-BL-SPC-3FC: 3 terminal line, blocking scheme, dual phase comparison, 3 frequency channel carrier to two
1. A two-frequency channel (2FC) can be either amplitude modulated (AM) on-off carrier or a high-low
frequency shift keying (FSK) system.
NOTE
2. Additional information about Phase Comparison schemes can be found in the Theory of Operation chapter.
3. In Blocking schemes, the Open Breaker Echo element must be disabled.
• 87PC BLOCK: Selects a Flexlogic™ operand that blocks operation of the phase comparison scheme (for example, an
operand that indicates operation of a communications channel failure detector).
• 87PC SIGNAL SOURCE: Selects whether current is supplied from one current source (either single-breaker CT appli-
cation or dual-breakers with CTs summed externally) or from two separate sources (breaker-and-a-half or ring configu-
rations), where currents from both CTs are fed into the L60 individually.
• 87PC SIGNAL: A mixed I_2-K*I_1 signal or a single 3I_0 signal can be chosen as the operating signal for the FDH and
FDL detectors and squaring amplifier. The constant K in the mixed excitation signal is adjustable.
• 87PC MIXED SIGNAL K: Selects the K factor used in the mixed excitation operating signal I_2-K*I_1.
• 87PC FDL PICKUP: This setting is used to select the FDL pickup value. FDL is used as a start-keying element.
• 87PC FDL AUX: This setting assigns an auxiliary element (an impedance element, for example) in parallel with FDL to
start channel keying. This is beneficial for power system conditions when FDL cannot pick up.
• 87PC FDH PICKUP: This setting is used to select FDH pickup value. FDH is used as a trip-arming element.
• 87PC FDH AUX: This setting assigns an auxiliary element (an impedance element, for example) in parallel with FDH
to permit tripping. This is beneficial for power system conditions where FDH cannot pick up.
• 87PC CH1(2) ASYMMETRY: These settings set the symmetry adjustment to make "positive" and "negative" halves of
the power cycle of the received signal from the remote terminal via communication channel noise symmetrical. Refer
to the test procedures for more detailed information.
• 87PC CH1(2) DELAY: These settings delay the local signal until the remote signal is received. Refer to the test proce-
dures for more detailed information.
5-80
87PC HIGH-SPEED TRIP
MESSAGE
CONTACT 1: Off
87PC HIGH-SPEED TRIP
MESSAGE
CONTACT 2: Off
87PC TARGET:
MESSAGE
Self-Reset
87PC EVENTS:
MESSAGE
Disabled
scheme cannot be used for breaker-and-a-half applications.
carrier to two other terminals.
two other terminals.
carrier to two other terminals.
other terminals.
L60 Line Phase Comparison Relay
Range: Off, available contact outputs
Range: Off, available contact outputs
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
GE Multilin