Condenser units

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Electrical equipment and electrical installations for general purposes

Chapter 2.9. Condenser units

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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2.9.1. This chapter applies to capacitor units with a voltage of 0,22 to 10 kV and a frequency of 50 Hz, designed for reactive power compensation and voltage regulation and connected in parallel with the inductive elements of the electrical network.

2.9.2. The capacitor unit must be in a technical condition that ensures its long-term and reliable operation.

2.9.3. The control of the capacitor unit, the regulation of the operation mode of the capacitor banks should, as a rule, be automatic.

The control of a capacitor unit, which has a switching device common with an individual receiver of electrical energy, can be carried out manually simultaneously with turning on or off the receiver of electrical energy.

2.9.4. The development of the operating modes of the capacitor plant should be carried out on the basis of the contractual values of the economic values of reactive energy and power. The operating modes of the capacitor unit must be approved by the technical manager of the Consumer.

2.9.5. At a voltage equal to 110% of the nominal value caused by an increase in voltage in the electrical network, the duration of the operation of the capacitor unit during the day should be no more than 12 hours. If the voltage rises above 110% of the nominal value, the capacitor unit must be immediately disconnected.

If the voltage on any single capacitor (capacitors in series) exceeds 110% of its nominal value, the operation of the capacitor bank is not allowed.

2.9.6. If the phase currents differ by more than 10%, the operation of the capacitor bank is not allowed.

2.9.7. A device for measuring the ambient air temperature must be provided at the installation site of the condensers. At the same time, it should be possible to monitor its readings without turning off the capacitor unit and removing the guards.

2.9.8. If the temperature of the condensers is below the maximum permissible lower temperature indicated on their nameplates or in the manufacturer's documentation, then the condenser unit cannot be put into operation.

The inclusion of a condenser unit is allowed only after the ambient temperature rises to the temperature value indicated in the passport.

2.9.9. The ambient air temperature at the installation site of the capacitors must not exceed the maximum value indicated on their nameplates or in the manufacturer's documentation. If this temperature is exceeded, ventilation must be increased. If within 1 hour the temperature has not decreased, the condensing unit must be switched off.

2.9.10. Battery capacitors must have serial numbers marked on the surface of the case.

2.9.11. The inclusion of a capacitor unit after it is turned off is allowed no earlier than after 1 min. in the presence of a discharge device connected directly (without switching devices and fuses) to a capacitor bank. If only resistors built into the capacitors are used as a discharge device, then the capacitor unit can be switched on again no earlier than after 1 min. for capacitors with a voltage of 660 V and below and after 5 minutes. for capacitors with a voltage of 660 V and above.

2.9.12. The switching on of a capacitor unit, disconnected by the action of protective devices, is allowed only after the cause of the disconnection has been clarified and eliminated.

2.9.13. The condenser unit must be provided with:

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a reserve stock of fuses for the corresponding rated currents of fuse-links;

a special rod for the control discharge of capacitors stored in the room capacitor bank;

fire-fighting equipment (fire extinguishers, a box with sand and a scoop).

On the doors outside and inside the chambers, the doors of the cabinets of capacitor banks, there must be inscriptions indicating their dispatcher name. On the outside of the doors of the chambers, as well as the cabinets of capacitor banks installed in the production premises, safety signs must be reinforced or applied with indelible paint. Doors must be kept locked at all times.

2.9.14. When replacing fuses, the capacitor unit must be disconnected from the mains and a break (by switching off the switching device) of the electrical circuit between the fuses and the capacitor bank must be ensured. If there are no conditions for such a break, then the fuses are replaced after the control discharge of all battery capacitors with a special rod.

The control discharge of capacitors is allowed to be carried out no earlier than 3 minutes after the installation is turned off, unless there are other instructions from the manufacturers.

2.9.15. When servicing capacitors that use trichlorobiphenyl as the impregnating dielectric, care must be taken to prevent its release into the environment. Failed capacitors impregnated with trichlorobiphenyl, in the absence of conditions for their disposal, are subject to destruction in specially designated places.

2.9.16. Inspection of the capacitor unit (without shutdown) should be carried out within the time limits established by the local production instructions, but at least 1 time per day at facilities with constant personnel on duty and at least 1 time per month at facilities without constant duty.

An extraordinary inspection of the capacitor unit is carried out in the event of an increase in voltage or ambient temperature to values close to the highest permissible values, the operation of protective devices, external influences that pose a danger to the normal operation of the unit, and also before turning it on.

2.9.17. When inspecting the condenser unit, check:

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serviceability of fences and constipation, the absence of foreign objects;

values of voltage, current, ambient temperature, load uniformity of individual phases;

technical condition of devices, equipment, contact connections, integrity and degree of pollution of insulation;

absence of drip leakage of the impregnating liquid and unacceptable swelling of the walls of capacitor cases;

Availability and condition of fire extinguishing equipment.

The results of the inspection should be made an appropriate entry in the operational log.

2.9.18. The frequency of major and current repairs, the scope of inspections and tests of electrical equipment and devices of the capacitor unit must comply with the requirements of the electrical equipment testing standards (Appendix 3).

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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