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AND

BLOCK

IRVBLK

tPickUpRev

10 ms

IRV

CurrRev = On

tDelayRev

IRVL

IEC09000031-4-en.vsd

IEC09000031 V4 EN-US

Figure 235: Simplified logic diagram for current reversal

12.5.6.3 Weak-end infeed logic

M13929-24 v10

The weak-end infeed function can be set to send only an echo signal (WEI=Echo)

or an echo signal and a trip signal (WEI=Echo & Trip). The corresponding logic

diagrams are depicted in Figure 236 and Figure 237.

The weak-end infeed logic uses normally a reverse and a forward direction

element, connected to WEIBLK2 via an OR-gate. If neither the forward nor the

reverse directional measuring element is activated during the last 200 ms, the

weak-end infeed logic echoes back the received permissive signal as shown in

Figure

236 and Figure 237. The weak-end infeed logic also echoes the received

permissive signal when CBOPEN is high (local breaker opens) prior to faults

appeared at the end of line.

If the forward or the reverse directional measuring element is activated during the

last 200 ms, the fault current is sufficient for the IED to detect the fault with the

earth fault function that is in operation.

1MRK 506 382-UEN A Section 12

Scheme communication

Line distance protection REL650 2.2 IEC 459

Technical manual

ABB REL650 User Manual

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