Toshiba GR200 Series Instruction Manual page 704

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Line-outage check

Voltage conditions

In the SYNCHK function the OVr, OVi, UVr, and UVi elements are used to verify the line-

condition. For example, when the user wishes to connect an incoming-line (i.e., transmission

line) with the running-line (i.e., a busbar), the voltage conditions on either lines may be

examined prior to connection. Alternatively, the absence of voltage on both lines may be

required before connection. In order to provide this functionality, the SYNCHK function has

four check zones to test for the line being either in-service or out-of-service; the four zones are

illustrated in Figure 4.6-7.

Vi on the incoming line

Setting [OVI1]

Setting [UVI1]

Figure 4.6-7 Four voltage conditions examined in SYNCHK_Ry1

For example, "DRLI" zone covers the case when the running-line is out-of-service (DR)

and the incoming-line is in-service (LI). Table 4.6-4 exemplifies the areas in accordance with

the voltage conditions.

Voltage condition

R unning line (Vr)

I ncoming line (Vi)

Figure 4.6-8 and Figure 4.6-9 show the voltage-presence (or voltage-absence) check logic

used in the SYNCHK_Ry1 and Ry2 functions.

Setting [UVR1]

Table 4.6-4 Four voltage conditions and zones

Vr on the running line

Setting [OVR1]

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)