6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 122 -
2.3.1
Permissive underreach protection (PUP)
(i)
Application
When an underreach element operates at local terminal, and when the circuit breaker (CB) is
tripped by this element, a trip permission signal† is sent to other opposite terminals. When
the opposite terminals receive the signal, CBs at these terminals are tripped instantly if an
overreaching element at respective these terminals has been operated. In PUP, Z1S/Z1G
elements in ZS/ZG are used for the underreach element, and ZCSF/ZCGF elements are used
for the overreaching element.
The trip permission signal is not sent until it is observed that the fault exists in the
protection zone of Z1S/Z1G; hence, PUP can provide excellent security., but PUP cannot provide
sufficient dependability if faults exist on the line including open terminals or weak infeed
terminals. This is because Z1S/Z1G cannot operate for this case‡.
†Note: The trip permission signal yielded by the underreaching element is transmitted
only; hence, respective terminals can share a telecommunication channel; and a
simplex channel can be used.
‡Note: At remote terminals, Z1X/ Z2 have a delay timer. Thus, they can remove the
faults.
(ii)
Scheme logic
Figure 2.3-1 shows PUP logic. When Z1S/Z1G operate at the local terminal, Z1S/Z1G issue a
single-phase trip signal or three-phase trip signal instantaneously; and a trip permission
signal (DISCAR-CS-*) is sent to the opposite terminals through the sending circuit. Figure
2.3-2 shows the sending circuit of PUP; the trip permission signals are (DISCAR-S: used for
the external carrier communication) and (INT.DISCAR-S-*: used for the integral carrier
communication). The selection of either the single-phase trip (
1P
) or the three-phase trip (
3P
)
is carried out using scheme switch [
DisCAR-TPMD
].
When the opposite terminal receives the trip permission signal, PUP at the opposite
terminal also issues a trip signal instantly when either ZCSF/ZCGF have been operated.
PUP can operate when
PUP
is set for scheme switch [
Dis-CAR
]. If PUP requires operating
ARC, set scheme switch [
DisCAR-ARCBlk
]
Non
. (For more information of ARC, see chapter
Relay application: Autoreclose
.)
Содержание GR 200 Series
Страница 1047: ...6F2S1915 0 46 GRZ200 Soft 031 032 1026 Figure 8 3 4 Screen shot from GR TIEMS ...
Страница 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
Страница 1369: ...6F2S1915 0 46 GRZ200 Soft 031 032 1348 Unit mm Panel cut out for 1 2 case size Figure 2 2 3 Panel cutout figure 1 2 size case ...
Страница 1410: ...6F2S1915 0 46 GRZ200 Soft 031 032 1389 This page is intentionally blank ...
Страница 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
Страница 1497: ...6F2S1915 0 46 GRZ200 Soft 031 032 1476 Appendix 7 Technical data ...
Страница 1518: ...6F2S1915 0 46 GRZ200 Soft 031 032 1497 Appendix 8 Manufacture setting ...
Страница 1520: ...6F2S1915 0 46 GRZ200 Soft 031 032 1499 Appendix 9 Matrix between VCT terminals and relay applications ...
Страница 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
Страница 1531: ...6F2S1915 0 46 GRZ200 Soft 031 032 1510 Appendix 12 Engineering exercise ...
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