7PG21 Solkor Rf Commissioning
©2012 Siemens Protection Devices Limited
Chapter 6 Page 18 of 21
Fig 9
Current transformer connections are typical only.
Earthing connections are typical only.
5kV Solkor Rf schemes omit the 15kV isolating transformers
Solkor R connections are shown in the relay Installation Recommendations.
An “E” above the connections indicates the Epsilon or Reymos case terminal numbers.
A “V” above the connections indicates the Vedette case terminal numbers.
4. Solkor Intertripping
4.1 Introduction
Solkor provides double ended tripping for in-zone faults. Use can also be made of the Solkor pilot link, and the
remote Solkor relay, to intertrip the remote circuit breaker to clear faults external to the Solkor protective zone for
example to backtrip from a busbar or transformer protection. There are several possible methods available, the
choice between them being dependent upon the current available through the protected feeder for the fault
conditions which required Intertripping.
4.2 Description
4.2.1 Open circuiting of pilots - Solkor-R and Solkor-Rf
Since Solkor protection is a current balance scheme, fault current intertripping can be effected by open circuiting
the pilot loop. The magnitude of the current required through remote current transformers to cause operation of
the relay depends somewhat on the intercore capacitance of the pilot line. For reliable intertripping the minimum
fault current through the remote current transformers should not be less than twice the nominal fault setting for
each type of fault
.
4.2.2 DC injection intertripping
Solkor R may also be intertripped by the direct application of a 110V dc voltage source to the local end of the
pilots. This d.c. may be derived from a 5kV or 15kV isolated intertripping battery or from a secure full wave
rectified 110V, 50/60Hz, voltage derived from a 5kV or 15kV isolation transformer
.
