How to test switchgear

How to test switchgear?

1. Each circuit all the elements were connection well and tight, supply electricity and display by indicator, whether all works ON/OFF;

2. Testing circuit breakers, it is important to check the condition of the circuit breaker contacts and circuit breaker operating mechanism to assure that the circuit breaker is opening and closing as designed.

3. The insulation resistance measurement test may be conducted on all types of electrical switchgear using the insulation resistance megohmmeter Test Phase to Phase, Phase to Earth; The resistance value is usually measured in microohms (µΩ). The average resistance value for 15 kV class circuit breakers is approximately between 200 and 250µΩ.

4. The hi-pot (High Potential) testing of switchgear involves testing of the circuit breakers and switchgear buses separately. This is a major test and determines the condition of the insulation of the switchgear assembly;

5. Protection Relay in the switchgear panel, will test each protection function;

6. Test the big current max 3200A for busbar inside switchgear, Power frequency, and the accuracy of CT, PT;

7. The design of the insulation system for metal-enclosed switchgear is based upon life expectancy of about 30 years. However, environmental conditions such as dirt, moisture, and corrosive atmosphere can shorten the design life.The electrical switchgear may be tested with AC or DC voltage to check the condition of the insulation of switchgear and circuit breakers.