TBBZ Automatic Compensation Device On High Voltage Reactive Power Column

Application

TBBZ high voltage reactive power automatic compensating equipment (hereinafter referred to as equipment) is suitable for 10KV and 6KV distribution circuit, installed on the overhead circuit, to improve power factor, reduce circuit consumption, save electric energy and improve the voltage quality, besides, it is also used for reactive compensating of 10KV busbar of miniature terminal transformer substation and compensating high voltage motor on the spot.
This equipment conforms to the standard JB/T7111-1993 High Voltage Shunt Capacitor Installation and standard DL/T604-1996 Specification of High voltage Shunt Capacitor Installation for Order.

It is made up of drop-out fuse, voltage transformer of large capacity, high voltage vacuum contactor special for switching capacitor, current transformer, ZnO arrester, whole-film high voltage shunt capacitor, automatic compensating controller of high voltage capacitor, box body and so on.

Service conditions

• Altitude: not higher than 1,000m；
• Wind velocity: not more than 35m/s；
• Earthquake: intensity of earthquake can't exceed 8 degree.
• Sunshine: max amplitude is 0.1w/cm2；
• Ambient air temperature: -40℃~+45℃;
• Chemical conditions: no harmful gas and steam, no electric conductive or explosive dust.
• Pollution-proof capability: leakage distance of outer insulation is ≥2.5cm/kV；
• Installation: the gradient is not more than 5 degree.
• The harmonic content of installation site shall conform to the national relevant regulations.

Note: If the products are used in the plateau area or special environments, user shall negotiate with us separately.

Characteristics

It has following highlight features: integration structure, complete assembly, compact structure, convenient maintenance,stable quality, long service life and so on. According to practical requirement, user can set the parameters. Its microcomputer can judge and analyze automatically, automatic switching of high voltage shunt capacitor bank can be realized. Furthermore, the equipment has perfect protection functions such as quick-breaking protection against busbar short-circuit, capacitor over-current short-time delay protection, over voltage protection, under voltage protection, phase failure protection (The protection functions can be chosen).

System running conditions

Rated voltage: 6kV,10kV；

Max running voltage: 6.6kV,11kV；

Rated frequency :50Hz；

System running conditions

Performance

• Capacitance difference

The difference of actual capacitance and rated capacitance of equipment is within the range 0-5%of rated capacitance

• Discharge performance

After power is off for 10min,voltage of each group of capacitors is lower than 50V.

• Protection

1. This equipment provides short-circuit protection,over-current protection,over-voltage protection.under voltage protection,voltage loss protection,phase failure protection (selectable) .Prevent capacitor closing with charge. The setting is shown as follows:
2. Phase-to-phase short circuit of main circuit:drop-out fuse operates to cut off the fault phase.the contactor performs time-delay operation (delay for 0.2~0.5S)a little to trip.and exitsrunning to close automatically.
3. Phase-to-neutral point short circuit of capacitor bank:the contactor performs time-delayoperation (delay for 0. 2-0. 5S) a little to trip,and exits running to close automatically. Thesetting value is 3ln.
4. Over current of capacitor bank: perform time-delay operation (delay for 5S)to trip,andclose automatically. The setting value is 1. 4~1. 51n.
5. Over voltage:perform time-delay operation (delay for 20-30S) to trip,the setting valueis1. 1-1. 3UN.
6. Lightning over voltage:protected by ZnO arrester.Operation over voltage:protected by capacitor type ZnO arrester.
7. Under voltage:perform time-delay (delay for 0. 2-0. 5S) a little to trip.
8. The settingvalue is 0. 6UN.Voltage loss:perform time-delay (delay for 0. 2-0. 5S) a little to trip.
9. Phase failure:perform any phase breaking operation to trip and close automatically (selectable)Prevent capacitor closing with charge:delay for 10min (not changed) before cutting in capacitor.

Note:above setting values and delay time can be set or changed according to requirement.

Selection for the best compensating capacity and compensating position of 6kV~10kV distribution circuit

It is an important problem that is worth being analyzed that how to choose and install TBBZ high voltage reactive automatic compensating equipment properly to get the least consumption and investment and best compensating benefit for 6kV-10kV distribution circuit.According to rule of equal network loss micro-increment rate and mathematic analysis,the following conclusion is got.(see following table):

Note:the best compensating capacitor that is the best distribution methodfor total reactive capacitor required by circuit,that is,transform substation shareof total compensating capacity,and the circuit share of total compensating capacity.In the practical application,the spot situation may not meet the requirementin the table,so the data in the table shall be used flexibly. With respect to selectionof installation site,please comprehensively consider any aspects such as traffic,environment and following management and so on.