20
Register Data recorded
9 Stage which performed the closing operation. Stage and checking functions are stored
in a memory with an operation mode number as follows:
1 = The synchro-check function of stage 1 performed the closing operation
2 = The voltage check function of stage 1 performed the closing operation
4 = The synchro-check function of stage 2 performed the closing operation
8 = The voltage check function of stage 2 performed the closing operation
Submenus 1...4: Mode numbers of closing operation events (n-1)...(n-4).
Submenu 5: Number of closing operations of the voltage-check function for stage 1.
0 Display of closing conditions fulfilled by the module stages
The right-most green digit indicates the closing conditions for stage 1 and the
middlemost digit indicates the corresponding closing conditions for stage 2. The
closing conditions fulfilled are presented as follows:
- No closing conditions fulfilled.
5 All voltage-check conditions are fulfilled.
4 The threshold voltage U
max
in the synchro-check function is valid.
* The network voltages are above the set threshold voltage value U
max
.
3 The voltage difference is less than the set value ∆U.
2 The frequency difference is less than the set value ∆f , the closing conditions 4
and 3 are also valid.
1 The phase angle difference is less than the set value ∆ϕ, the closing conditions 4,
3 and 2 are also valid.
0 All closing conditions in the synchro-check function are fulfilled. The operate
time of the circuit breaker is shorter than the valid time for the closing conditions
calculated from the frequency and phase angle difference.
The relation between frequency and phase angle difference is as follows:
t
validx3
= ∆ϕ / (180° *∆f) and t
validx3
> t
CBx3
t
validx3
: valid time for closing conditions.
The length of the closing signal in continuous mode operation should be at least
70 ms, approximately. Thus, the t
validx3
time must be about 70 ms longer than
the operating time of the circuit breaker before a closing signal is delivered.
t
CBx3
: operate time of the circuit breaker to be controlled.
Submenu: Display of blocking and command signals
The right-most green digit of the submenu display indicates the state of the block-
ing inputs of the synchro-check module. The blocking input states are indicated as
follows:
0 = no blocking signals
1 = the blocking signal BS13 is active
2 = the blocking signal BS23 is active
3 = both blocking signals are active
The middle green digit of the submenu display indicates the state of the command
inputs of the synchro-check module. The command input states are indicated as
follows:
0 = no command signals
1 = the command signal CS13 is active
2 = the command signal CS 23 is active
3 = both command signals are active
The effect of the external command signals on the relay is determined by the setting
of switchgroup SGB.
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