Toshiba GR200 Series Instruction Manual page 400

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VCHK1 for 1CB system

Characteristic and elements

VCHK1 does voltage and synchronous check in 1CB system. Four relay elements (OVB, OVB,

UVL, and UVL) are used for voltage check. Tow relay elements (OVB and OVL) are used for

verification of existing voltage; the remaining ones (UVB and UVL) are used for verification of

non-existing voltage.

Voltage condition and check zone

Figure 2.25-2 shows four zones (A1 to D1) for voltage verification. For example, if both UVB

and OVL elements are active, VHCK1 determines that the Bus-bar is in Dead condition (no-

voltage) and Line is in Live condition (existing voltage). This condition holds true for A1 zone.

If voltage condition matches with B1 zone, synchronous check is carried out on VCHK1. Thus,

this means that Synchronous check is not carried out in A1, C1 or D1 zones.

Voltage condition

Bus-bar voltage (V B )

Line voltage (V L )

V L Line voltage

(Incoming voltage)

Dead bus and

Dead bus and

Figure 2.25-2 Check zones by VCHK1

Table 2.25-2 Voltage condition by VCHK1

Live bus and

Live bus and

V B Bus-bar voltage

(Running voltage)

Voltage check

Synchronism check

6F2S1915 (0.46)

GRZ200 (Soft 031 & 032)