Technical operation of condenser units
The capacitor must be in a technical condition that guarantees its long-term and reliable operation.
Capacitor bank control
The control of the capacitor unit, the adjustment of the mode of operation of the capacitor banks, as a rule, should be automatic.
The control of a capacitor unit having a switching device in common with a separate receiver of electrical energy can be carried out manually at the same time as switching the receiver of electrical energy on or off.
Operating modes of capacitor banks
The development of the operation modes of the capacitor unit should be carried out based on the agreed values of the economic values of reactive energy and power. The operating modes of the condenser unit must be approved by the User's technical supervisor.
At a voltage equal to 110% of the nominal value caused by an increase in the voltage in the electrical network, the duration of operation of the capacitor unit during the day should be no more than 12 hours.When the voltage rises above 110% of the nominal value, the capacitor unit must be immediately switched off.
If the voltage of any single capacitor (series capacitors) exceeds 110% of its nominal value, operation of the capacitor bank is not allowed.
If the currents in the phases differ by more than 10%, the operation of the capacitor bank is not allowed.
Requirements to the room for installation of capacitor banks
A device for measuring the ambient air temperature must be provided at the place where the condensers are installed. At the same time, it should be possible to observe its readings without turning off the condenser unit and removing the barriers.
If the temperature of the capacitors is below the maximum permissible lowest temperature indicated on their nameplates or in the manufacturer's documentation, then the operation of the capacitor unit is not allowed.
The inclusion of the condenser is allowed only after the ambient temperature has risen to the temperature value specified in the passport.
The ambient temperature at the place of installation of the capacitors must not exceed the maximum value indicated on the technical plates or in the manufacturer's documentation. If this temperature is exceeded, ventilation must be increased. If the temperature has not dropped within 1 hour, the condenser should be turned off.
Capacitor banks should have serial numbers printed on the surface of the case.
Switching on the capacitor bank
Turning on the capacitor unit after turning it off is allowed no earlier than 1 minute.in the presence of a discharge device connected directly (without switching devices and fuses) to the capacitor bank. If only resistors built into capacitors, then the restart of the capacitor unit is allowed no earlier than 1 min. for capacitors with a voltage of 660 V and below and after 5 min. for capacitors with a voltage of 660 V and higher.
The inclusion of a capacitor bank disabled by the action of protective devices is allowed only after clarifying and removing the cause of the shutdown.
Fuses to protect capacitor banks
The capacitor must be provided with: a backup supply of fuses for the relevant rated fuse currents; a special tape for control discharge of capacitors stored in the capacitor bank; fire fighting equipment (fire extinguishers, sandbox and shovel).
On the doors outside and inside the chambers, the doors of the cabinets of the capacitor banks, inscriptions should be made indicating their shipping name. On the outside of cell doors, as well as capacitor bank cabinets installed in production rooms, safety signs must be reinforced or painted with indelible paint. Doors must be locked at all times.
When replacing the fuses, the capacitor bank must be disconnected from the mains and the circuit between the fuses and the capacitor bank must be interrupted (by switching off the switching device). If there are no conditions for such a gap, then the fuses are replaced after the control discharge of all capacitors of the battery with a special rod.
Control discharge of the capacitor bank
The trial discharge of capacitors is allowed to be carried out no earlier than 3 minutes after turning off the device, if there are no other instructions from the manufacturers.
Rules for operation of capacitor banks
At support For capacitors that use trichlorobiphenyl as an impregnating dielectric, precautions must be taken to prevent its release into the environment. Faulty capacitors impregnated with trichlorobiphenyl, in the absence of conditions for their disposal, must be destroyed in specially designated places.
The inspection of the condensing unit (non-stop) must be carried out at the time specified by the local production instructions, but at least 1 time per day in facilities with permanent personnel duty and at least 1 time per month in facilities without permanent duty.
An emergency inspection of the condensing unit is carried out in the event of an increase in the voltage or temperature of the surrounding air to values close to the highest permissible, the action of protective devices, external influences that pose a danger to the normal operation of the unit, as well as before being included.
When checking a capacitor, check: serviceability of fences and constipation, absence of foreign objects; values of voltage, current, ambient temperature, load uniformity of individual phases; technical condition of devices, equipment, contact connections, the integrity and degree of isolation of the insulation; lack of drip leakage of the impregnating liquid and unacceptable swelling of the walls of the condenser housings; availability and condition of fire extinguishers.
An appropriate entry should be made of the results of the inspection in the operational logbook.
The frequency of major and ongoing repairs, the scope of inspections and tests of electrical equipment and devices of the capacitor bank must comply with the requirements of the electrical equipment testing standards.