Capacitor installations. Wiring diagram, equipment selection

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Capacitor installations. Wiring diagram, equipment selection

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

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5.6.7. Capacitor units can be connected to the network through a separate device designed to turn on and off only capacitors, or through a common device with a power transformer, asynchronous electric motor or other electrical receiver. These circuits can be applied at any voltage of the capacitor bank.

5.6.8. Capacitor banks for voltages above 10 kV are assembled from single-phase capacitors by parallel-series connection. The number of consecutive rows of capacitors is chosen so that in normal operating modes the current load on the capacitors does not exceed the nominal value. The number of capacitors in a row should be such that when one of them is disconnected due to a blown fuse, the voltage on the remaining capacitors in the row does not exceed 110% of the nominal.

5.6.9. Capacitor batteries with a voltage of 10 kV and below should be assembled, as a rule, from capacitors with a rated voltage equal to the rated voltage of the network. In this case, long-term operation of single capacitors with a voltage of not more than 110% of the nominal is allowed.

5.6.10. In three-phase batteries, single-phase capacitors are connected in a delta or star. A series or parallel-series connection of single-phase capacitors in each phase of a three-phase battery can also be used.

5.6.11. When choosing a capacitor bank circuit breaker, the presence of capacitor banks connected in parallel (for example, to common busbars) should be taken into account. If necessary, devices should be provided to reduce current surges at the moment the battery is turned on.

5.6.12. The capacitor bank disconnector shall have battery-side earthing blades interlocked with its disconnector. The capacitor bank disconnectors must be interlocked with the battery breaker.

5.6.13. Capacitors must have discharge devices.

Single capacitors for capacitor banks are recommended for use with built-in discharge resistors. It is allowed to install capacitors without built-in discharge resistors, if a discharge device is constantly connected to the terminals of a single capacitor or a series of capacitors. Discharge devices may not be installed on batteries up to 1 kV if they are connected to the network through a transformer and there are no switching devices between the battery and the transformer.

As discharge devices can be used:

voltage transformers or devices with active-inductive resistance - for capacitor installations above 1 kV;
devices with active or active-inductive resistance - for capacitor installations up to 1 kV.

5.6.14. To achieve the most economical mode of operation of electrical networks with a variable reactive load schedule, automatic control of the power of a capacitor unit should be used by turning it on and off as a whole or its individual parts.

5.6.15. Apparatus and current-carrying parts in the circuit of the capacitor bank must allow the continuous passage of current, which is 130% of the rated current of the battery.

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

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