Toshiba GR-200 Series Instruction Manual page 310

Multi functional protection ied

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Check logic for the voltage and the synchronism

The VCHK function can send the permissive signal when the results of the voltage check and

synchronism check are successful, as described earlier. Figure 2.25-8 illustrates that the ARC-

VCHK signal is sent to the ARC function when one or more of the following conditions are

established: (1) Synchronism check operates, (2) the OVB and UVL elements operate, (3) the

UVB and OVL elements operate or (4) the UVB and UVL elements operate. To engage the

check logic in the VCHK function, the user should set the [ARC-LB_DL], [ARC-DB_LL], [ARC-

DB_DL], and [ARC-SYN1] switches. For example, if the DB_LL condition, (see Table 2.25-1) is

the only criteria for ARC operation, On should be set for the scheme switch [ARC-DB_LL] while

Off is set for the others. As a result, the ARC can reclose the CB on receiving the permissive

signal from the VCHK function. Note that the SYN-df dose not operate when Off is set for the

†Note: Signal "VCHK_OVL3P" may be used when the user wishes to check for the

presence of respective phase-voltages on the line.

Figure 2.25-8 VCHK Logic

0.01-100.00s

0.01-100.00s

0.01-100.00s

0.01-100.00s

0.01-100.00s

6F2T0200 (0.15)

GRE200 (1,2)

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