Application

There are two principles of BSC application:

• shunt BSC, which are switched on to bus-bars of substations in parallel, as well as are used to generate reactive power in network nodes –a cross compensation;
• banks of longitudinal compensation, which are switched on in lines in series to reduce a reactive resistance of lines – a longitudinal compensation.

 

Construction

Capacitor batteries for power from 5 up to 200 MVar, for voltage of 6, 10, 35, 110, 220kV, manufactured at JSC “UKCP”, are issued as separate blocks on which capacitors are placed. BSC are completed from separate capacitors connected in parallel – in series. Capacitors of KEP, KEPF or KES types are used to complete batteries. Capacitors are produced in single phase and three phase performance for rated voltage 1.05 – 12 kV, power from 300 up to 1000kvar and have built in safety devices and discharge resistors.

Capacitor batteries of JSC “UKCP” production are projected accounting a maximum possible facilitation of works at its mounting, as well as accounting the conditions arising during transportation. Capacitor blocks are supplied in an assembled view. During BSC mounting it is necessary just to install blocks and fulfill necessary electrical connections.

Depending on the construction and power of BSC, blocks in the battery can be installed one on another up to 3 (three) layers.

As example drawing 1 and drawing 2 present an overall drawing and an electrical scheme of the battery of static capacitors UKT-10.5-8100 UHL2 where capacitors are switched on as per the scheme “double star”.

 

Advantages

 

Main technical and commercial advantages of capacitors in compare with other compensating devices are as follows:

• possibility of application at a low voltage as well as at a high voltage;
• small losses of active power;
• long service life;
• simplicity of operation (due to absence of rotating parts);
• simplicity of mounting and manufacture (small weight, absence of foundation);
• possibility of installation of capacitors in dry non-heated premises as well as outdoors.

Disadvantages

 

1. dependence of generating reactive power on voltage can lead to occurrence of voltage collapse;
2. impossibility of reactive power consumption (voltage control is possible only in one direction);
3. step control of reactive power generation and impossibility of its smooth change, hence, voltage control is not smooth but step;
4. Sensibility to distortions of supplying voltage curve shape.

At BSC ordering there shall be indicated battery power, rated voltage and short-circuit current at installation place, type and quantity of capacitors in the battery, placement and climatic category, as well as other customer’s requirements.