C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 8-1
C70 Capacitor Bank Protection and Control System
Chapter 8: Application of settings
Application of settings
This chapter provides example(s) of use.
8.1 Arrangement of shunt capacitor banks
8.1.1 Overview
The appropriate protection is dependent on the capacitor bank type, configuration, CTs and VTs location and connections.
IEEE Standard C37.99-2000: Guide for Protection of Shunt Capacitor Banks specifies methods used for protecting different
types of banks.
There are four types of arrangements and individual capacitors connections used to form a capacitor bank.
• Externally fused capacitors
• Internally fused capacitors
• Fuseless capacitors
• Unfused capacitors
These arrangements are described in the following sections.
8.1.2 Externally fused capacitors
An individual fuse, externally mounted between the capacitor unit and the capacitor bank fuse bus, protects each
capacitor unit. The capacitor unit can be designed for a relatively high voltage since the external fuse is capable of
interrupting a high-voltage fault. However, the kvar rating of the individual capacitor unit is usually smaller because a
minimum number of parallel units are required to limit the voltage rise on remaining units and thus allow the bank to
remain in service with a capacitor can out of service. A capacitor bank using fused capacitors is configured using one or
more series groups of parallel-connected capacitor units per-phase, as shown.
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