⎯
65
⎯
6 F 2 S 0 8 4 6
2.4.4.2 Directional Earth Fault Protection
The scheme logic is shown in Figure 2.4.4.1.
The directional inverse or definite time earth fault protection as backup protection executes
three-phase final tripping. The forward looking DEFF or reverse looking DEFR can be selected.
The directional inverse and definite time earth fault protections are available to trip
instantaneously by binary input DEF
∗
_INST-TRIP except for [DEF
∗
EN]= “OFF” setting.
In order to give priority to the distance protection, the directional earth fault protection enables
inverse time or definite time delayed tripping by the scheme switch [DEF
∗
EN].
Setting
The settings necessary for the directional earth fault protection are as follows:
Element Range
Step Default Remarks
DEFF
Forward looking DEF
DEFFI
0.5 - 5.0 A
0.1 A
1.0 A
Residual current
(0.10 - 1.00 A
0.01 A
0.2 A) (*)
DEFFV
1.7 – 21.0 V
0.1 V
2.0 V
Residual voltage
TDEF
0.00 - 0.30 s
0.01 s
2.0 s
Definite time setting
DEFR
Reverse looking DEF
DEFRI
0.5 - 5.0 A
0.1 A
1.0 A
Residual current
(0.10 - 1.00 A
0.01 A
0.2 A) (*)
DEFRV
1.7 – 21.0 V
0.1 V
2.0 V
Residual voltage
TDER
0.00 - 0.30 s
0.01 s
2.0 s
Definite time setting
DEF
θ
0 - 90°
1°
85°
Characteristic angle
DEFFEN
OFF/ON
OFF
Forward DEF backup trip enable
DEFREN
OFF/ON
OFF
Reverse DEF backup trip enable
DEFI
OFF/NOD/F/R
OFF
EFI directional control
DEFBTAL
OFF/ON
ON
DEF backup trip alarm
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
The DEF element is shared with the command protection.
2.4.5 Overcurrent Backup Protection
Inverse time and definite time overcurrent protections are provided for phase faults and earth
faults respectively.
Scheme logic
The scheme logic of the overcurrent backup protection is shown in Figure 2.4.5.1. The phase
overcurrent protection issues single-phase tripping signals in the operation of OC and OCI, and
can issue a three-phase tripping signal BU-TRIP by PLC signals OC_3PTP and OCI_3PTP. The
default of the phase overcurrent backup protection is a three-phase tripping since both of the PLC
signals OC_3PTP and OCI_3PTP are assigned to “1(=logic level)” (Signal No. =1). The earth
fault protection issues a three-phase tripping signal BU-TRIP in the operation of EF or EFI
element.
The overcurrent backup protection can provide a fail-safe function by assigning the PLC signals
OC-
∗
_FS and OCI-
∗
_FS to an output of relay element, etc. The PLC signals OC-
∗
_FS and
OCI-
∗
_FS are assigned to “1” (Signal No. =1) as default.
Tripping by each element can be disabled by the scheme switches [OCBT], [OCIBT], [EFBT] and
Содержание GRZ100 B Series
Страница 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Страница 271: ... 270 6 F 2 S 0 8 4 6 ...
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 ...
Страница 447: ......