Capacitor installations. Protection

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 5. Electric power plants

Capacitor installations. Protection

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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5.6.16. Capacitor installations in general must have short-circuit protection, acting on tripping without delay. The protection must be tuned out from the switching currents of the installation and current surges in case of overvoltages.

5.6.17. The capacitor bank as a whole must have overvoltage protection that turns off the battery when the effective voltage value rises above the permissible value. The unit should be switched off with a time delay of 3-5 minutes. Re-enabling the capacitor unit is allowed after the voltage in the network drops to the nominal value, but not earlier than 5 minutes after it is turned off. Protection is not required if the battery is selected taking into account the maximum possible value of the circuit voltage, i.e., so that when the voltage rises, a voltage of more than 110% of the nominal voltage cannot be applied to a single capacitor for a long time.

5.6.18. In cases where it is possible to overload capacitors with higher harmonic currents, relay protection should be provided that disconnects the capacitor unit with a time delay at the effective current value for single capacitors exceeding 130% of the nominal value.

5.6.19. For a capacitor bank with two or more parallel branches, it is recommended to use protection that operates when the equality of the currents of the branches is violated.

5.6.20. On batteries with parallel-series connection of capacitors, each capacitor above 1,05 kV must be protected by an external fuse that operates when the capacitor breaks down. Capacitors of 1,05 kV and below must have fuses built into the case, one for each section, which are triggered when the section breaks down.

5.6.21. On batteries assembled according to an electrical connection scheme with several sections, protection of each section against short-circuit currents must be applied, regardless of the protection of the capacitor bank as a whole. This section protection is not necessary if each single capacitor is protected by a separate external or built-in fuse. Section protection should ensure its reliable shutdown at the smallest and largest values of short-circuit current at a given point in the network.

5.6.22. The electrical connection diagram of capacitor banks and fuses must be selected so that damage to the insulation of individual capacitors does not lead to the destruction of their cases, an increase in voltage above the long-term allowable voltage on the capacitors remaining in operation and the disconnection of the battery as a whole.

To protect capacitors above 1 kV, fuses must be used that limit the value of the short-circuit current.

External capacitor fuses must have blown indicators.

5.6.23. Protection of capacitor installations from lightning surges should be provided in those cases and by the same means as provided in Ch. 4.2.

See other articles Section Rules for the installation of electrical installations (PUE).

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