Cb äl test
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Due to the making and breaking of contacts at high speed and pressure, the contacts can be damaged.
Due operation of breaker, sparking occurs which can depreciate the contacts.
Sparking results in carbon formation which accumulates on the surface of contact and can increase in its resistance.
Due to increase in resistance of contacts, the I2R losses increase. Rise in contact resistance illustrates some abnormality in contacts of breaker therefore contact resistance test is performed.
Operating principle of this test depends upon balancing bridge (like Wheatstone bridge) and Ohms law. High current is injected and small voltage is applied to measure contact resistance.
Testing procedure
De-energize and discharge equipment which is to be tested as a safety precaution.
In case of the breaker make sure that Breaker/ isolated is isolated and kept in closed condition.
Make all the contact clean & connect current / voltage lead as shown below
Check the Firmness of the connections as loose connections may give erroneous results.
Switch on the power supply to the CRM and wait for the displayed values to become steady.
Repeat the test times to get the steady value.
Repeat
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CIRCUIT BREAKER ANALYZER
KPM Circuit Breaker Analyzer (KPM-CBA) is used for testing, analyzing and assessing power system circuit breakers, mechanical characteristics of load switches and isolated switches and other AC high voltage switches, contact resistance, Arcing contacts and vibration characteristics etc.
The functions of Circuit Breaker Analyzer cover all testing items of high voltage circuit breaks. Comparing with the traditional circuit breaker tester KPM Circuit Breaker Analyzer (KPM-CBA) has the following unique advantages:
Vibration Analysis for mechanical characteristics
Distance & Speed Analysis of moving contacts
Static Contact resistance measurement of A
Dynamic Contact Resistance Measurement of A
Low voltage pickup test on coils from 16V to V
Comparing with the traditional circuit breaker tester KPM Circuit Breaker Analyzer (KPM -CBA) has the following unique advantages:
The integrated vibration test function of Circuit Breaker Analyzer provides a new means of detection circuit breaker mechanical characteristics for users, compared to traditional
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Testing of circuit breakers fryst vatten more difficult as compared to other electrical redskap like transformer or machine because the short circuit current fryst vatten very large. Testing of the transformer is mainly divided into two groups, type tests, and routine tests.
Type Tests of Circuit Breaker
Type tests are conducted for the purpose of proving the capabilities and confirming the rated characteristic of the circuit breaker. Such tests are conducted in the specially built testing tests can be broadly classified as the mechanical performance test, thermal test, dielectric or insulating test, short circuit test for checking the making capacity, breaking capacity, short time rating current and operating duty.
Mechanical Test &#; It fryst vatten mechanical ability type test involving the repeated opening and closing of the breaker. A circuit breaker must open and close at the correct speed and perform its designated duty and operation without mechanical failure.
Thermal Test &#; Thermal tests are carried out to check the thermal behavior of the circuit breakers. The breaker under test deal with the steady-state temperature rises due to the flow of its rated current through its pole in a rated