Procedure for Testing of Capacitor Banks

PROCEDURE PROC EDURE FOR TESTING TE STING OF CAPACITOR CAPACITOR AND REACTOR BANKS. BANKS.

PROCEDURE PROC EDURE FOR TESTING TE STING OF CAPACITOR CAPACITOR BANKS BANKS

The above conn co nnection ection shows the procedure for testing of individu individual al capacitor. capac itor. In capacitor ca pacitor banks each phas phase e contains 4 individu individual al capacitors capac itors connected together. So for testin tes ting g the the each eac h capacitor, capac itor, we have to remove remove the the connection betwee between n capacitors capac itors and external conn co nnections. ections. After isolate the exter e xternal nal connections co nnections there there is two terminals terminals in one o ne capacitor, ca pacitor, one one is capacitor ca pacitor terminal terminal and another one is capacitor c apacitor earth neutral terminal. 1. Insul Insulation ation Resistance Re sistance tes tests. ts. In this this test tes t we have to test tes t the IR value for the the capacitor capac itor between capacitor capac itor terminal terminal and Earthing Earthing terminal terminal using 5KV Megge Me gger. r. 2. Capac Capacitance itance measurement measurement tes test. t. The above connection diagram diagram shows the test setup of capacitance c apacitance measurement. measurement. Connect the the LCR meter between betwee n tthe he capacitance capac itance and Earthing Earthing terminals. terminals. Turn the dial switch s witch of LCR meter to the capacitance capac itance un units its and check the value of individ individual ual capacitor. capac itor. Check our meas measured ured value with w ith the the Name plate plate value. Repeat Repea t the test for all other indivi individu dual al capacitors capac itors.. For total capacitance ca pacitance we have to connect co nnect back all the terminals terminals of capacitor capac itor banks with neutral neutral CT and VT cables and then measure any one of the phase ph ase capacitor c apacitor we will get total capacitance capacitance of each ea ch phases phases..

PROCEDURE FOR TESTING OF REACTORS.

The above connection shows the procedure for testing of Reactors. The above circuit shows the connections of R, Y, B phases in substations. So for testing each reactor, we have to remove the External connections. After isolate the external connections there is two terminals in one reactor, one is incoming terminal and another one outgoing terminal 1. Insulation Resistance tests. In this test we have to test the IR value for the each reactor between reactor terminals and Earth using 5KV Me gger. 2. Reactor measurement test. The above connection diagram shows the test setup of reactor measurement. Connect the LCR meter between the Incoming and outgoing terminals. Turn the dial switch of LCR meter to the Reactor units and check the value of Reactor. Check our measured value with the Name plate value. Repeat the test for all other phases.

Neutral current transformer test in capacitor bank: The following test must be carried out in Neutral CT at capacitor banks. 1. CT Insulation resistance test by insulation tester as Primary to Ground, Primary to secondary, secondary to ground. (Primary to Ground must be 5KV applied, Primary to Secondary must be 2.5KV applied and Secondary to Ground 1KV applied). 2. CT ratio and polarity test. 3. CT winding resistance Test. 4. CT Excitation current and Knee point voltage Test.

Neutral Voltage transformer test in capacitor bank: The following test must be carried out in Neutral VT at capacitor banks. 1. VT Insulation resistance test by insulation tester as Primary to Ground, Primary to secondary, secondary to ground. (Primary to Ground must be 5KV applied, Primary to Secondary must be 2.5KV applied and Secondary to Ground 1KV applied). 2. VT ratio and polarity test. 3. VT winding resistance Test.

Surge Arrestor test in capacitor bank: The following test must be carried out in surge Arrestor at capacitor banks. 1. 2. 3.

Insulation Resistance test by insulation tester for all three phases of surge arrestor between phases to ground at 5KV applied. Surge Arrestor Tan Delta Test(capacitance and Dissipation power factor) at 10 KV (optional) Surge counter test.