In an Electrical Switchboards there are multiple types of problem may occurs but few of them are comes in frequent manner so by taking immediate action we can resolve or analysis the problem to encounter. Whenever we are going to do below activities we must know experience technician is required to perform below steps:-
| S. No. | Problem | Cause | Steps for Troubleshooting |
1 |
No Indication |
-No Power-No Control Supply |
Check the Supply at I/C Feedera. Check control supply terminals for presence of voltage as per drawingb. Check auxiliary supply to measuring instrumentsc. If control supply available as specified in the drawings then check MCB for proper operation |
2 |
No Measurement |
-No Power-No Control Supply |
Check the below at I/C Feedera. Check control supply terminals for presence of voltage as per drawingb. Check auxiliary supply to measuring instrumentsc. If control supply available as specified in the drawings then check MCB for proper operation |
3 |
Power monitors not showing any readings |
-Auxiliary supply failed-Voltage & current signal to instrument not available |
Check wither auxiliary supply to meter is present :-a. Check voltage at terminals of meter as per drawingb. Check CT terminals for removal or shorting |
4 |
Circuit breaker not closing automatically or manually |
-Closing circuit not healthy-Tripping circuit operated |
Firstly check auto/manual selector switch for desired positionAutomodea. Check trip indication of all Protective Relays.b. Check electrical interlocking circuit as per drawing.Manuala. Check supply to closing coil.b. Check whether breaker spring is charged or not. |
5 |
Breaker closes but trips |
Fault in power circuit |
Check flags/ indication on protection relay, reset and close the breaker if problem persists check distribution circuit for faults.a. Check supply to U/V coil.b. Check whether Under Voltage Relay operated. |
6 |
Power monitor not showing proper readings |
-Current/ Voltage signals not proper-Program of power monitor may be erratic |
a. Check Current and Voltage signalb. Program of the power monitor for voltage signal and CT ratio check and reprogram as described in the operations manual. |
7 |
CT Meters not showing reading |
CT shorting terminal mat be short |
a. Open all shorting terminal provided in metering compartmentb. Check whether load is available or not |
To encounter many issue related to above listed problems, a small amount of maintenance provides huge gains in reliability. Some basic things that need to be in the preventive maintenance procedures include:
- Pest control
This may consist of a rodent trap in one corner. Whatever method, ensure it’s inspected periodically.
- Dust control
Vacuum the accumulated dust off the cabinet floors. If conditions require vacuuming anything else, remember it’s an energized cabinet — follow the applicable procedures. Don’t vacuum near circuit boards without following electrostatic discharge (ESD) rules.
- Connection control
It seems counterintuitive, but re-tightening terminal screws causes loose connections. Instead of inadvertently over-tightening terminal screws (consequently diminishing their clamping power), use an infrared gun to see which terminals are high resistance. Disassemble, clean, and reassemble.
- Insulation
An insulation resistance testing program is the best way to prevent wiring failures.
By taking a few extra steps in the selection, design, and installation of an industrial control panel, you can ensure it will have no failure time bombs ticking away. With a modest maintenance program, it will be nearly problem-free for its entire life.
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