This document provides the operation manual of 7PG21 Solkor Rf Feeder Protection, including usage instructions, performance specifications, application guides, settings, installation, commissioning, diagrams, etc.
This document is a technical service manual for the Siemens 7PG21 Solkor Rf Feeder Protection device. It details operation principles, performance specifications, installation procedures, commissioning steps, and wiring diagrams. The device is a pilot wire current differential protection system for 2-core pilot cables with high resistance. It includes features like high transient stability, low fault settings, and optional 15kV isolation. The manual also explains how to convert the relay to Solkor R mode and how to configure padding resistors for different pilot resistance values.
The device uses a summation transformer to compare currents at each end of a three-phase line over a single pilot pair. Operation is based on circulating current and equipotential relaying points that alternate between ends during half-cycles. The manual includes detailed schematics and explains the role of non-linear resistors, padding resistors, and diodes in voltage limiting and stability.
| Insulation Level | 5kV between secondary winding and primary winding |
|---|---|
| Operating Element | Attracted armature type with three contacts |
| Pilot Resistance | Configurable via padding resistors |
| Conversion to Solkor R | By moving internal wire links and fitting an external wire link |
A 5kV insulation level is provided between the secondary winding of the summation transformer and its primary winding.
By moving internal wire links and fitting an external wire link.
The padding resistors comprise five series connected sections, each section having a short circuiting link. The values of the resistance on the sections are 35 ohms, 65 ohms, 130 ohms, 260 ohms and 500ohms.