Toshiba GR200 Series Instruction Manual page 143

Line differential protection ied

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the power swing remains within the shaded area of the rectangle between the outer and inner

elements. A delayed pick-up timer, [TPSBS] is initiated when the locus passes through the

PSBSOUT element and continues until the PSBSIN element operates in order to measure the

time duration for the locus to pass through the shaded area. If this time duration is longer

than the set value of the delayed pick-up timer [TPSBS], the PSBS element will operate to

block the operation of the distance protection trip signal.

Other than the power swing condition, measured impedance locus may stay in the PSBS

zone for a certain time which is much longer than the PSBS detection timer [TPSBS]. In this

case, the PSBS output can be reset forcibly when the locus remains in the PSBS zone for

another timer setting [TPSBSFR] and scheme switch [PSBSFR] is set to On.

If PSB operation is not required when a fault is occurring during the power swing event,

set On for the scheme switch [PSBSRS]; accordingly, PSB operation cannot work when the

fault is detected by the operation of EFL or OCN-PS element (i.e., ZS/ZG element is able to

work even if the PSB operates). It is also possible to remove the PSB operation by utilizing an

external reset signal, which can be injected at PLC connection point 'PSBS F.RESET'.

Another delayed timer resets the trip block signal that is generated by the PSBS element

when the power swing is detected after the PSBSOUT operation is removed; 500ms is the value

set for the delayed pick-up timer.

Similarly, a PSB element is also provided for ZG and its operation is termed as PSBG

(See Figure 2.10-29). The setting of PSBGs is similar to those of PSBSs.

DISTANCE COMMON

PSBS F.RESET

Figure 2.10-28 PSBS logic

0.02 to 0.100s

0.0 to 10.00s

6F2S1914 (0.49)

To VTF and CTF

PSBS-CVTF-BLK

GRL200 (Soft 033 & 037)

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