7PG21 Solkor Rf Commissioning
©2012 Siemens Protection Devices Limited
Chapter 6 Page 6 of 21
ohms, 260 ohms and 500 ohms. One or more sections can be inserted by removing the appropriate link or links
which are located on the link-board. Choose the same value at each end.
It should be as near as possible to:
(SV-RP)
2T
where SV = Standard Value from Table 2
RP =Pilot Loop Resistance
T = Isolating Transformer Tap
= 1.0 if no isolating transformer fitted
= 1.0 for isolating transformer tapping F2
= 0.5 for isolating transformer tapping T2
= 0.25 for isolating transformer tapping T1
Table 2 shows the standard pilot loop resistance and maximum inter-core capacitance permissible for the various
arrangements of Solkor. When isolating transformers are fitted it is recommended that, as a general rule, the tap
chosen should be the one which allows the maximum value of pilot capacitance for the measured pilot loop
resistance.
When inserting a padding resistance in Vedette case versions, the link should be completely removed on the
Vedette case. Do not merely open-circuit the link by pivoting the link on one terminal and leaving it in this position,
as this can reduce the insulation level between the padding resistor and earth. For Epsilon and Reymos case
versions, the resistors are inserted by changing the plug position.
Transformer
terminal
Transformer tap
value (T)
Standard value of
pilot loop resistance
(S.V.)
Maximum
capacitance
between cores
μ
F
Solkor R
-
1.0
1000
2.5
Solkor Rf without
isolating
transformers
- 1.0
2000
0.8
F2 1.0 1760
1
T2 0.5 880 2
Solkor Rf with
isolating
transformers
T1 0.25
440 4
Table 2 - resistance and capacitance limitations
2.6.3 Pilot connection check
If isolating transformers are not fitted check that relay terminals 17 at both ends of the feeder are connected by
one pilot core and that relay terminals 18 at both ends of the feeder are connected by the other pilot core. For
Vedette versions, terminal 5 corresponds to 18 and terminal 12 corresponds to 17.
Do this by disconnecting the pilots at both ends, earthing one core at the remote end and measuring the
resistance to earth of each core at the local end. The pilot core giving the lower reading is the one which is
earthed at the remote end. If isolating transformers are fitted check that transformers terminals S2 at both ends of
the feeder are connected byone pilot core. Check that the other pilot core connects transformer terminal F2, T2 or
T1 (depending upon which tapping is being used) at one end of the feeder to the equivalent transformer terminal
at the other end of the feeder.
2.7 Overall fault-setting tests
If testing by single-phase primary-injection is not possible, make the alternative tests described in section 2.10
Alternative tests if primary injection equipment is not available.
The purpose of these tests is to establish the overall fault-settings of the protection and also to establish that the
secondary wiring between the current-transformers and the summation transformer at each end is in accordance
with the particular diagram supplied for the installation.
Remove the trip-links but ensure that the padding resistors are correctly set. Connect the test-supply initially to
simulate a Red-earth fault-condition as shown in Fig. 2 and perform the tests in the following sequence.
Connect a d.c. milli-ammeter in the operating circuit of each relay as shown in Fig. 2.
