GE L30, Инструкция по эксплуатации

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CHAPTER 6: ACTUAL VALUES STATUS
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 6-7
6
The status information for two channels displays in this menu.
CHANNEL 1(2) STATUS
— This represents the receiver status of each channel. If the value is “OK,” the 87L current differential
element is enabled and data is being received from the remote terminal; If the value is “FAIL,” the 87L element is enabled
and data is not being received from the remote terminal. If “n/a,” the 87L element is disabled.
CHANNEL 1(2) LOST PACKETS
— Current, timing, and control data is transmitted to the remote terminals in data packets at a
rate of two packets per cycle. The number of lost packets represents data packets lost in transmission; this count can be
reset through the
COMMANDS  CLEAR RECORDS
menu.
CHANNEL 1(2) LOCAL LOOPBACK STATUS
— The result of the local loopback test displays here.
CHANNEL 1(2) REMOTE LOOPBACK STATUS
— The result of the remote loopback test displays here.
CHANNEL 1(2) LOOP DELAY
— Displays the round trip channel delay (including loopback processing time of the remote relay)
computed during a remote loopback test under normal relay operation, in milliseconds (ms).
CHNL 1(2) ASYMMETRY
— The result of channel asymmetry calculations derived from GPS signal displays here for both
channels if
CHANNEL ASYMMETRY
is “Enabled”. A positive “+” sign indicates that the transit delay in the transmitting direction
is less than the delay in the receiving direction; a negative “–” sign indicates that the transit delay in the transmitting
direction is more than the delay in the receiving direction. A displayed value of “0.0” indicates that either asymmetry is not
present or cannot be estimated due to failure with local/remote GPS clock source.
VALIDITY OF CHANNEL CONFIGURATION
— The current state of the communications channel identification check, and hence
validity, displays here. If a remote relay ID number does not match the programmed number at the local relay, the “FAIL”
value displays. The “n/a” value appears if the local relay ID is set to a default value of “0” or if the 87L element is disabled.
See the
SETTINGS

SYSTEM SETUP

POWER SYSTEM
section for more information
PFLL STATUS
— This value represents the status of the phase and frequency locked loop (PFLL) filter that uses timing
information from local and remote terminals to synchronize the clocks of all terminals. If
PFLL STATUS
is “OK,” the clocks of
all terminals are synchronized and 87L protection is enabled. If it is “FAIL,” the clocks of all terminals are not synchronized
and 87L protection is disabled. At startup, the clocks of all terminals are not synchronized and the PFLL status displays as
“FAIL.” It takes up to eight seconds after startup for the value to change from “FAIL” to “OK.” When the status is “n/a,” then
PFLL is disabled.
6.3.11 Digital counters
ACTUAL VALUES  STATUS  DIGITAL COUNTERS  DIGITAL COUNTERS Counter 1(8)

CHANNEL 2 LOST
PACKETS: 0
Range: 0 to 65535 in steps of 1. Reset count to 0
through the COMMANDS  CLEAR RECORDS menu.

CHANNEL 2 LOCAL
LOOPBCK STATUS: n/a
Range: n/a, FAIL, OK

CHANNEL 2 REMOTE
LOOPBCK STATUS: n/a
Range: n/a, FAIL, OK

CHANNEL 2
LOOP DELAY: 0.0 ms

CHNL 2 ASYMMETRY:
+0.0 ms
Range: –10 to 10 ms in steps of 0.1

VALIDITY OF CHANNEL
CONFIGURATION: n/a
Range: n/a, FAIL, OK

PFLL
STATUS: n/a
Range: n/a, FAIL, OK
 DIGITAL COUNTERS

Counter 1

Counter 1 ACCUM:
0

Counter 1 FROZEN:
0