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 pari of a series capacitor installation, but which
are external to the capacitor pari itself. The recommendations for the capacitor pari are
given in IEC 143. The protective equipment is 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.
EN 60143-2:1994 history
2013EN 60143-2:2013 Series capacitors for power systems - Part 2: Protective equipment for series capacitor banks
1970EN 60143-2:1994 Series capacitors for power systems Part 2. Protective equipment for series capacitor banks