Download  Print this page

Pilot Schemes - GE UR Series Instruction Manual

Line differential relay.
Hide thumbs
   
1
2
3
4
Table of Contents
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470

Advertisement

5.6 CONTROL ELEMENTS
a) PERMISSIVE OVER-REACHING TRANSFER TRIP (POTT)
Ø
PATH: SETTINGS
CONTROL ELEMENTS
POTT SCHEME
5
This scheme is intended for two-terminal line applications only. It uses an over-reaching Zone 2 distance element to essen-
tially compare the direction to a fault at both the ends of the line. Ground directional overcurrent functions available in the
relay can be used in conjunction with the Zone 2 distance element to key the scheme and initiate its operation. This pro-
vides increased coverage for high-resistance faults.
For proper scheme operation, the Zone 2 phase and ground distance elements must be enabled, configured, and set per
the rules of distance relaying. The Line Pickup element should be enabled, configured and set properly to detect line-end-
open/weak-infeed conditions. If used by this scheme, the selected ground directional overcurrent function(s) must be
enabled, configured, and set accordingly.
POTT PERMISSIVE ECHO:
If set to "Enabled" this setting will result in sending a permissive echo signal to the remote end. The permissive signal is
echoed back upon receiving a reliable POTT RX signal from the remote end while the line-end-open condition is identified
by the Line Pickup logic. The Permissive Echo is programmed as a one-shot logic. The echo is sent only once and then the
echo logic locks out for a settable period of time (
on the duration or shape of the received POTT RX signal but is settable as
POTT RX PICKUP DELAY:
This setting enables the relay to cope with spurious receive signals. The delay should be set longer than the longest spuri-
ous TX signal that can occur simultaneously with the zone 2 pickup. The selected delay will increase the response time of
the scheme.
5-148
ÖØ

PILOT SCHEMES

POTT SCHEME
FUNCTION: Disabled
POTT PERMISSIVE
MESSAGE
ECHO: Disabled
POTT RX PICKUP
MESSAGE
DELAY: 0.000 s
TRANS BLOCK PICKUP
MESSAGE
DELAY: 0.020 s
TRANS BLOCK RESET
MESSAGE
DELAY: 0.090 s
ECHO DURATION:
MESSAGE
0.100 s
ECHO LOCKOUT:
MESSAGE
0.250 s
LINE END OPEN PICKUP
MESSAGE
DELAY:
0.050 s
POTT SEAL-IN
MESSAGE
DELAY:
0.400 s
GND DIR O/C FWD:
MESSAGE
Off
POTT RX:
MESSAGE
Off
ECHO LOCKOUT
L90 Line Differential Relay
ÖØ
POTT SCHEME
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic™ operand
Range: FlexLogic™ operand
setting). The duration of the echo pulse does not depend
ECHO DURATION
5 SETTINGS
5.6.12 PILOT SCHEMES
.
GE Power Management

Advertisement

Table of Contents

   Also See for GE UR Series

   Related Manuals for GE UR Series

This manual is also suitable for:

L90

Comments to this Manuals

Symbols: 0
Latest comments: