Hitachi Relion 650 Series Technical Manual page 346

Section 12
Monitoring
L1 is operated first, then L2, and finally L3. The time delay between poles is defined by the
TimeOutAlarmDelay setting. It ensures that any cross cable interference or wiring mix up between
phases can be reliably detected.
The function also detects static wiring errors, dynamic wiring errors and errors in command
execution. These are described below.
Static wiring errors
When static wiring errors are detected, operation of the circuit breaker is not permitted until they are
rectified. A static wiring error is detected if at least one of the following expectations is violated.
1. All 3 poles are either not open or closed simultaneously. If two poles are open and one pole is
closed, the pole that is closed will be declared to have an error as it is not in agreement with the
other two poles being open. The same applies vice versa if two poles are closed and one pole is
open.
2. For any phase, if the primary contact is open it expects NO/52a to be open and NC/52b to be
closed.
3. For any phase, if the primary contact is closed it expects NO/52a to be closed and NC/52b to be
open.
CBLEARN checks the position of the breaker from the primary and auxiliary contacts. If the CB
position of any phase has errors, the wiringError (WIERLX) signal of the corresponding phase is
activated. The observed wiring errors and the corresponding error codes are shown in
Table 298: Wiring errors and corresponding error codes
Static wiring error in phase
WIERL1
0
1
0
0
1
1
0
1
Command issued to phase L1 or
phase L2 or phase L3 but status
changeovers are not received
Command issued to one phase but
status changeovers are observed in
different phase(s)
The indications for static wiring errors will remain active for as long as the unexpected status
combination persists.
Dynamic wiring errors
Dynamic wiring errors are detected during the execution of the Open/Close commands. For example:
If the command is released to phase L1, CBLEARN expects status changes of the primary and
auxiliary contacts of phase L1 only. If no status changeover is observed within a set period, it
declares a time-out alarm and dynamic wiring error in phase L1. The same is applied to detect wiring
errors in phases L2 and L3. If an Open or Close command is issued to one phase but status
changeovers are detected in another phase, CBLEARN issues a wiring error. Error codes for
different types of wiring errors are explained in
340
Error Code for WIERCD
WIERL2 WIERL3
0 0 NoWiringErr
0 0 WirErrL1
1 0 WirErrL2
0 1 WirErrL3
1 0 WirErrL1&L2
0 1 WirErrL1&L3
1 1 WirErrL2&L3
1 1 WirErrL1&L2&L3
WirErrStatChngeNR
WirErrStChOtherPh
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Numeric code of WIERCD
0
1
2
3
4
5
6
7
Refer the table below
Table 299.
1MRK 511 557-UEN Rev. A
Table 298.
Technical Manual