BS EN 60143-2:1995 Series capacitors for power systems - Part 2. Protective equipment for series capacitor banks
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This part of IEC 143 covers protective equipment for series capacitor banks, with a size larger than 10 Mvar per phase. Protective equipment is defined as the main circuit apparatus and ancillary equipment, which are part of a series capacitor installation, but which are external to the capacitor part itself. The recommendations for the capacitor part are given in IEC 143. The protective equipment mentioned in clauses 1.3 and 7.6 of IEC 143.
The protective equipment, treated in this standard, comprises the following items listed below.
- overvoltage protector,
- protective spark gap,
- non-linear resistor (varistor),
- by-pass circuit-breaker,
- disconnectors,
- current-limiting damping equipment,
- discharge reactor,
- voltage transformer,
- current transformer,
- signal column.
- relay protection, control equipment and platform to ground communication equipment.
See figure 1.
Principles involved in the application and operation of series capacitors are given in section 3.
Examples of fault scenarios are given in section 3.
Examples of protective schemes utilizing different overvoltage protectors are given in clause 2.1.
