Measuring The Operating Time Of The Circuit Breaker (Only 7Sj64) - Siemens siprotec SJ62 User Manual

3 Mounting and Commissioning

3.3.14 Measuring the Operating Time of the Circuit Breaker (only 7SJ64)

Only for Synchro-
nism Check
437
Temperature in Temperature in
°C
30 86
40 104
50 122
60 140
70 158
80 176
90 194
100 212
110 230
120 248
130 266
140 284
150 302
160 320
170 338
180 356
190 374
200 392
210 410
220 428
230 446
240 464
250 482
Temperature thresholds that are configured in the protection device can be checked
by slowly approaching the resistance value.
If device 7SJ64 is equipped with the function for synchronism and voltage check and
it is applied, it is necessary – under asynchronous system conditions – that the oper-
ating time of the circuit breaker is measured and set correctly when closing. If the syn-
chronism check function is not used or only for closing under synchronous system
conditions, this subsection is irrelevant.
For measuring the operating time a setup as shown in Figure 3-40 is recommended.
The timer is set to a range of 1 s and a graduation of 1 ms.
The circuit breaker is connected manually. At the same time the timer is started. After
closing the poles of the circuit breaker, the voltage V
stopped. The time displayed by the timer is the real circuit breaker closing time.
If the timer is not stopped due to an unfavourable closing moment, the attempt will be
repeated.
It is particularly favourable to calculate the mean value from several (3 to 5) successful
switching attempts.
In address 6X20 set this time to T-CB close (under Power System Data of the syn-
chronism check). Select the next lower settable value.
Ni 100 DIN 43760 Ni 120 DIN 34760 Pt 100 IEC 60751
°F
117.055771
123.011173
129.105
135.340259
141.720613
148.250369
154.934473
161.7785
168.788637
175.971673
183.334982
190.88651
198.63475
206.58873
214.757989
223.152552
231.782912
240.66
249.79516
259.200121
268.886968
278.868111
289.15625
140.466925 111.672925
147.613407 115.5408
154.926 119.397125
162.408311 123.2419
170.064735 127.075125
177.900442 130.8968
185.921368 134.706925
194.1342 138.5055
202.546364 142.292525
211.166007 146.068
220.001979 149.831925
229.063812 153.5843
238.3617 157.325125
247.906476 161.0544
257.709587 164.772125
267.783063 168.4783
278.139495 172.172925
288.792 175.856
299.754192 179.527525
311.040145 183.1875
322.664362 186.835925
334.641733 190.4728
346.9875 194.098125
appears and the timer is
Line
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015