Toshiba GR-200 Series Instruction Manual page 303

Multi functional protection ied

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The VCHK can have the decision of synchronism between the running voltage and the

incoming voltage when the following items (i) to (iv) are satisfied:

Voltage magnitudes

The magnitude of the running voltage and the incoming voltage are greater than

the SYN1 setting:

Voltage difference

The difference of the magnitude between the running voltage and the incoming

voltage (ΔV) is smaller than the SYN setting:

Note: The VCHK calculation should be achieved with respective rating voltages in

Frequency difference

The frequency difference between the running voltage and the incoming voltage

(Δf) is smaller than the SYN setting:

Note: When Off is set for the scheme switch [SYN-dfEN], the VCHK abandons the

V B ≥ [VCHK-OVB] and V L ≥ [VCHK-OVL]

ΔV ≥ | V B − K × V L | ≤ [SYN-dV]

V B and V L being identical. Thus, the VCHK function has a matching factor

(K) designed to adjust the respective rating voltages when they are not

identical. The matching factor (K) is calculated automatically using the

setting values of VCT ratios; the K is generated based on the busbar voltage

as shown below:

VT⁡ratio⁡at⁡Line

VT⁡ratio⁡at⁡busbar

whereas, 'VT ratio at Line' is obtained from the actual value in VCT ratio

setting corresponding with scheme switch [SYN-VLine], and 'VT ratio at

busbar' is obtained from the actual one corresponding with the scheme switch

[SYN-VBus]. We shall see the scheme switches in the succeeding section.

Δf ≥ | fV B − fV L | ≤ [SYN1-df]

frequency difference condition from synchronism requirements.

Setting for difference angle between V B and V L

Checking V L for "Line being in live condition"

Checking V B for "Busbar being in live condition"

Delay time for Synchro-check

Synchronism check enable

6F2T0200 (0.15)

GRE200 (1,2)

Chapters

Gre200-1 Gre200-2