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2 CALCULATION OF SETTINGS
2.2 GENERAL SETTINGS
2.2 GENERAL SETTINGS
2.2.1 CONFIGURATION
101: UNITID - Unit ID Number
The UNITID is a decimal number between 0 and 9999 that uniquely identifies an LPS-O relay system. When
the LPS-O system is accessed via one of the serial ports the UNITID must be known to establish communica-
tion, thus providing an additional measure of security. UNITID can only be changed with the keypad. It is not
possible to change UNITID with the LPSO-Link communications program.
2
102: SYSFREQ - System Frequency
SYSFREQ establishes the frequency at which the LPS-O system will operate. It can be set to either 50 Hz or
60 Hz. When this setting is changed, it will only be implemented by turning the DC power off and then on to re-
initialize the LPS-O system.
103: PHASRROTATE - Phase Rotation
PHASRROTATE can be set to either ABC or ACB to match the positive-sequence phase rotation for the power
system where the LPS-O system is installed. This setting permits the LPS-O system to properly report the
faulted phase or phase pair.
104: TIMESYNCH - Select Time Synchronization
TIMESYNCH determines the method of synchronizing the LPS-O internal clock; it can be set to 0 (INTERNAL)
or 1 (IRIG-B). TIMESYNCH = 0 lets the clock run freely from the internal oscillator. TIMESYNCH = 1 synchro-
nizes the clock using an IRIG-B signal connected directly to the LPS-O system via the assigned port.
105: NUM_BKR - Number of Breakers
NUM_BKR can be set to either 1 or 2. When set to 1, the TRIP and CLOSE commands can only be used to
activate the BREAKER 1 trip and close outputs. When set to 2, the TRIP and CLOSE commands can selec-
tively be used to activate either the BREAKER 1 or BREAKER 2 outputs.
106: NUM_TC - Number of Trip Circuits
Assignment of the trip outputs in the LPS-O relaying system is made via the NUM_TC setting and is directly
coupled to the NUM_BKR setting.
Four outputs (T1 to T4) are available for tripping and are assigned per the NUM_TC setting as shown below in
Table 2–1: TRIPPING SCHEMES. If one breaker with a single trip circuit is being used (NUM_TC = 1), then
outputs T2 to T4 are available for assignment to different tasks through the Xpression Builder program pro-
vided with the LPS-O system. Outputs T3 and T4 are used only if two breakers are being controlled and if each
of the breakers has two independent trip circuits (NUM_TC = 2). If independent trip coils are not being used,
then the T3 to T4 contacts can be re-assigned through Xpression Builder.
The LPS-O system is provided with the capability (when enabled) to trip the breaker(s) locally through the key-
pad, or remotely via the LPSO-Link program or the ASCII commands. In order for the LPS-O system to recog-
nize which breaker should be tripped, the NUM_TC setting must be made as given in Table 2–1: TRIPPING
SCHEMES and the trip outputs must be connected to the appropriate trip coils as assigned in the tables. For
example, if NUM_TC = 2, then trip output T1 must be connected to the trip coil TC-1 of breaker number 1 and
the output T2 must be connected to the trip coil TC-1 of breaker number 2.
GE Power Management
LPS-O Line Protection System
2-
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