Medium Voltage Capacitor Bank Sizing

The energy that affects the surge arrester depends on the capacitance of the capacitor bank owing to the charge stored in the bank itself.

Medium voltage capacitor bank sizing.

Specification for medium voltage power capacitor banks and accessories 1 0 scope this specification covers the design manufacture and testing of power capacitor banks and accessories of the following types for use in the 12 kv and 36 kv overhead lines to improve the power factor of the medium voltage distribution system. Medium voltage capacitors are composed of elementary or partial capacitors generally connected in several series parallel groups providing the required electrical characteristics for the unit. Ge supplies low voltage and medium voltage fixed and automatically switched capacitors for power factor. They provide the reactive power needed by electrical motors transformers etc.

Cable selection for medium voltage capacitor banks and harmonic filter banks introduction this document presents the fundamental aspects of cable and conductor selection for connecting pad mounted shunt capacitor and harmonic filters to industrial commercial and utility power systems with voltages of 2 4 kv to 34 5 kv. Depending on the size of a compensation unit it is assembled with capacitors of equal size in bigger units or of different size. Gem series fixed capacitors. Ge also supplies active filtering equipment and line load reactors for specific line and load applications.

Capacitor bank protection 1. A unit with a total reactive power of for example 300 kvar consists of six power capacitors of 50 kvar each. Capacitors are very beneficial in power grids. Capacitors units should not give less than 100 and more than 115 of rated reactive power at rated.

Correction and harmonic mitigation in the range of 240v through 13 2kv. The reactive power supplied by the fixed capacitor bank is constant irrespective of any variations in the power factor and the load of the receivers. Capacitor units should be capable of continuous operation up to 110 of rated terminal rms 5 voltage and a crest peak voltage not exceeding 2 x 2 of rated rms voltage including harmonics but excluding transients the capacitor should also be able to carry 135 of nominal current. This overcurrent relay detects an asymmetry in the capacitor bank caused by blown internal fuses short circuits across bushings or between capacitor units and the racks in which they are mounted.

Fixed type capacitor banks. These capacitor banks are switched on either manually circuit breaker switch or semi automatically by a remote controlled contactor. Medium voltage capacitor switching guide in actual fact surge arresters installed even further away including low voltage ones can be affected in the case of multiple restriking events. Each capacitor unit consist of a number of elements protected by internal fuses.

Type of capacitor bank as per its application 1.