⎯
100
⎯
6 F 2 S 0 8 4 6
2.5 Characteristics of Measuring Elements
2.5.1 Distance Measuring Elements Z1, Z1X, Z2, ZF, Z3, Z4, ZR1, ZR2, ZND and PSB
The GRZ100 provides eight distance measuring zones with mho-based characteristics or
quadrilateral characteristics.
As shown in Figure 2.5.1.1, mho-based zone characteristics are composed of mho element, offset
mho element, impedance element, reactance element, and blinder element for phase fault
protection and earth fault protection.
Z1 (zone 1), Z1X (zone 1 extension), Z2 (zone 2), ZF (zone F) and ZR1 (reverse zone 1) are a
combination of the reactance element, mho element and blinder element.
Z3 (zone 3), ZR2 (reverse zone 2), and Z4 use the mho element and blinder element, but Z4 for
phase faults uses the offset mho element instead of mho element. This makes it possible to detect a
reverse close-up fault at high speed if Z4 for phase faults is used for the command protection.
ZND (non-directional zone) uses the impedance element and blinder element.
The blinder element is normally used to restrict the resistive reach of the mho or offset mho
element if their operating range encroaches upon the load impedance.
The blinder element (BFR) can be provided for each forward zone. The setting of blinder element
can be set independently or set common to forward zones by the scheme switch [BLZONE].
X
Z1XS
Z2S
Z4S
Z3S
Z1S
Z1S
θ
1
Z1S
θ
2
ZR1S
ZR2S
ZNDS
BFLS
BFRS
BRLS
B
∗∗
S: Blinder elements
BRRS
BNDS
R
75
°
ZFS
Z3S
θ
Z4S
θ
BNDS
X
Z1XG
Z2G
Z4G
Z3G
Z1G
Z1G
θ
1
Z1G
θ
2
ZR1G
ZR2G
BFLG
BFRG
BRLG
BRRG
B
∗∗
G: Blinder elements
ZNDG
BNDG
BNDG
R
75
°
ZFG
Z3G
θ
Z4G
θ
(
a) Phase fault element (b) Earth fault element
Figure 2.5.1.1 Mho-based Characteristics
As shown in Figure 2.5.1.2, quadrilateral zone characteristics are composed of reactance element,
directional element and blinder element. Z4 for phase faults uses the offset directional element to
ensure a reverse close-up fault detection.
The forward offset reach of reverse zones (ZR1, ZR2) for both mho-based and quadrilateral
characteristics is fixed as 7.5 ohms for 1A rating or 1.5 ohms for 5A rating. However, when they
are used for back-up tripping ([ZR
∗
BT]= "ON"), the forward offset reach is limited to the zone 1
reach setting, as shown in Figure 2.5.1.3. Z4, on the other hand, is normally used to provide
Содержание GRZ100 B Series
Страница 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
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Страница 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Страница 307: ... 306 6 F 2 S 0 8 4 6 ...
Страница 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Страница 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Страница 321: ... 320 6 F 2 S 0 8 4 6 ...
Страница 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Страница 331: ... 330 6 F 2 S 0 8 4 6 ...
Страница 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Страница 377: ... 376 6 F 2 S 0 8 4 6 ...
Страница 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Страница 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Страница 389: ... 388 6 F 2 S 0 8 4 6 ...
Страница 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Страница 401: ... 400 6 F 2 S 0 8 4 6 ...
Страница 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Страница 405: ... 404 6 F 2 S 0 8 4 6 ...
Страница 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Страница 417: ... 416 6 F 2 S 0 8 4 6 ...
Страница 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Страница 430: ... 429 6 F 2 S 0 8 4 6 Appendix O Programmable Reset Characteristics and Implementation of Thermal Model to IEC60255 8 ...
Страница 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Страница 437: ... 436 6 F 2 S 0 8 4 6 ...
Страница 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Страница 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
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