Toshiba GR200 Series Instruction Manual page 278

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Miscellaneous functions

OVG operation blocked by the occurrence of VT failure

Blocking the OVG function may be required when a failure in the voltage transformer occurs.

The user shall set Block for scheme switch [OVG1-VTFBlk]. Non (as a default) is set for scheme

switch [OVG1-VTFBlk] in order that the OVG function is not blocked by the failure.

Switch of OVG trip command

The OVG function issues a trip command for the TRC† when Trip is set for scheme switch

[OVG1-UseFor] as the normal trip operation. However, when an alarm signal in place of the

trip command is required, the user can set Alarm for the scheme switch [OVG1-UseFor].

†Note: For more information of the trip circuit, see Chapter

Execution of OVG function

Set On for scheme switch [OVG1-EN]. Otherwise, set Off for the scheme switch [OVG1-EN] if

the OVG1 element is not required to operate.

Scheme logic

Figure 2.14-4 shows the OVG function logic. Signal connection points "OVG*_BLOCK" are

provided for the block of the operation of the OV elements. For testing, the OVG1-PU element

is provided; it generates a pick-up signal when the entering voltage is excesses of the threshold

anytime. Thereby, in the IDMT characteristic, using both monitoring points "8000011C23" and

"8000011C27" can facilitate to measure the pickup time after the excess.

6F2S1915 (0.46)

Relay application: Trip

GRZ200 (Soft 031 & 032)