Toshiba GR200 Series Instruction Manual page 147

Line differential protection ied

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Z1CNT-ARCBlk

Z1CNT-INSTOP

Figure 2.10-31 Scheme logic of Zone1 operation control

Command protection feature

The means of telecommunication makes possible for protective relays to exchange its operation

information. If the protective relays locate at each end of the protected line with the

telecommunication, the distance protection functions can determine whether the fault is

internal or external to the protected line.

As for the ZS, we provide the user the function of distance protection telecommunicated

as command protection (ZCSF and ZCSR). As for the ZG, we also provide the user the ZCSF

and ZCSR for the command protection. The user should take case that, discussed here are the

elements and characteristic of the command protection only; we provide the operation

instruction of this function separately. (See Chapter

command protection

For the operation, the user should set On for the scheme switches [ZCS-EN] and [ZCG-

EN], respectively.

ZS command protection

Figure 2.10-32 and Figure 2.10-33 show the ZS characteristic of the command protection. You

can find the Mho or the Quad characteristic; and you can select its characteristic when you

place the set of Mho or Quad for the scheme switch [ZS-Chara].

As shown in Figure 2.10-32, if you require placing an element in the Mho characteristic

in forward direction (ZCSF), you should place the reach setting of the ZCSF for settings [ZCSF-

Mho.Reach] and [ZCSF-Mho.Angle] both. On the other hand, when you need to prescribe the

reach setting of the ZCSF in reactance X, you should place its setting value for setting [ZCSF-

Z1CNT-ARCBLK

Z1CNT-INSTOP

Relay application: Distance carrier

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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