Equipment Options; Solkor Plain Protection Schemes; Pilot Supervision; 5Kv Schemes - Siemens 7PG21 Solkor Rf Technical Manual

3

Equipment Options

The following equipment lists provide an overview of the equipment normally required, highlighting differences
for the various scheme options. These lists should be used in conjunction with the diagrams that follow.

3.1 Solkor Plain Protection Schemes

Solkor R/Rf relay (5kV), 1 per feeder end
15kV isolation transformer, 1 per feeder end if required

3.2 Pilot Supervision

3.2.1

5kV Schemes

3.2.1.1 Send End
Pilot Supervision Send End relay (transformer+rectifier), 1 per circuit
B22 AC Supply Supervision relay, 1 per circuit
3.2.1.2 Receive End
Pilot Supervision Receive End relay (B74 & B75), 1 per circuit
Note: Although the 5kV scheme utilises a combined B75/B74 unit, the additional isolation requirements at 15kV
necessitate that separate units must be used.
3.2.2 15kV Schemes
3.2.2.1 Send End
15kV Pilot Supervision Send End relay (transformer+rectifier), 1 per circuit
B22 AC Supply Supervision relay, 1 per circuit. 5kV insulation as this is not connected to the pilots.
3.2.2.2 Receive End
15kV B75 relay, 1 per circuit
B74 relay, 1 per circuit
Note: Although the 5kV scheme utilises a combined B75/B74 unit, the additional isolation requirements at 15kV
necessitate that separate units must be used.

3.3 Injection Intertripping 5kV or 15kV

(Equipment listed is for single ended intertripping for 2 ended intertripping, double quantities are
required).Sustained intertripping will require one additional 300ohm 18W economy resistor per inverter
3.3.1

R mode

Inverter for Solkor R
TEC relay
3.3.2

Rf mode

Inverter for Solkor Rf
TEC relay
B34 relay
©2010 Siemens Protection Devices Limited
7PG21 Solkor Rf Applications Guide
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Chapter 3 Page 5 of 15