Common faults and solutions of LZZBJ current transformer

2025-08-06 13:41:45

1. Common faults of LZZBJ Current Transformer

(1) Secondary side open circuit

-Phenomenon:

-The measuring instrument shows no indication or abnormal fluctuations

-Open circuit points may generate high-voltage sparks, endangering equipment safety

-Reason:

-Loose or poor contact of wiring Terminals

-Secondary circuit disconnection

(2) Insulation aging or breakdown

-Phenomenon:

-Localized fever and abnormal noise

-The decrease in insulation resistance may lead to a short circuit

-Reason:

-Long term dampness and accumulation of dirt

-Overvoltage surge (such as lightning strike)

(3) Iron core saturation leads to increased error

-Phenomenon:

-The current measurement value has a large deviation

-Relay protection misoperation

-Reason:

-Once the current exceeds the rated value (such as short circuit fault)

-Deterioration of iron core material

2. Fault detection methods

-Secondary side open circuit detection:

-Measure the resistance of the secondary circuit using a multimeter

-Check if the wiring Terminals are loose

-Insulation test:

-Measure the insulation resistance with a megohmmeter (500V or 1000V range), which should be>100M Ω normally

-Error testing:

-Using a transformer calibrator to detect ratio and angle differences

3. Solutions and preventive measures

-Secondary side open circuit treatment:

-Tighten the wiring terminals and replace damaged wires

-Installing an open circuit protector to prevent high voltage hazards

-Insulation repair:

-Clean the surface if it is dirty, and dry or replace it if it is severely damp

-Regularly conduct voltage withstand tests (such as 2kV/1min)

-Prevent iron core saturation:

-Choose the appropriate ratio to avoid long-term overload

-Select TP level protective transformers in situations with high short-circuit currents

4. Maintenance suggestions

-Regular inspections, with a focus on checking wiring, temperature rise, and abnormal noise

-Conduct insulation resistance testing and accuracy verification at least once a year

-Strengthen protective measures in damp and polluted environments

conclusion

The stable operation of LZZBJ current transformer is crucial for the power system. By understanding common faults, mastering detection methods, and taking effective maintenance measures, the risk of accidents can be significantly reduced. If you need technical parameters or professional maintenance services for LZZBJ transformers, it is recommended to contact us.