Table 4-3 Common faults and troubleshooting of power frequency coreless induction furnace

Failure and phenomenon

cause

elimination method

Broken cooling water pipe

Scale clogging

Regular replacement and cleaning

Damaged water-cooled cable

Aging after long-term use

Regular replacement

Cracked pipe

Replace immediately and regularly, check for leaks

Furnace cooling water temperature rises

Rust attached to the pipe or blocked by foreign matter

Pickling or blowing with compressed air when the furnace is empty

The water pump displacement has not reached the pump capacity

Repair the water pump and confirm whether the amount of water is appropriate

Part of the furnace lining has been burned

Check the burning of the furnace lining and repair it in time

Coil grounding accident

Foreign iron beans and foreign objects adhere to the surface of the coil and cause a short circuit

Daily cleaning, protect with dust-proof tape

Foreign iron beans, etc. drilled into the gap between the coil and the yoke adhered to the short circuit

Install dust curtains, refurbish the gap between the stove and the periphery of the stove, brush insulating paint to enhance the insulation between coil layers

When rebuilding the furnace, due to the iron beans and other metals drilled into the coil, the charge is not completely removed, resulting in a short circuit

Remove iron beans and other metal objects that are likely to cause short circuits

Slime iron

The lining was not compacted during repair

Use correct tamping method and replace furnace building tools

Improper sintering (residual moisture, incomplete sintering)

Follow the sintering process, use anhydrous boric acid, add an appropriate amount

Mixed with foreign matter

No foreign objects are allowed to enter

Improper repair of refractory materials

Choose and mix the repair materials

Use time is too long

Check the furnace diameter and height once a week, control the furnace age, and then build the furnace

Cracked lining

Repair or rebuild the furnace according to the size of the cracks

Transformer failure

Self-heating when oil temperature rises (under load)

Regular inspection of refueling and gas analysis of insulating oil

Oil deterioration (mixed with moisture, natural deterioration, etc.), resulting in a drop in pressure resistance

Check the air volume of the cooling fan to see if it is blocked

Capacitor burnout, breakdown

Spontaneous heating when oil temperature rises

When removing or replacing the alarm, please pay attention to the operation when the voltage drops and do not exceed the temperature setting value

Withstand voltage drop due to oil oxidation, natural deterioration, etc.

Check cooling fan air flow and clogging, 1 Yue 1 times the appearance of periodic inspection (summer to pay special attention)

Leakage Liquid Detector

Circuit break

replace

Poor contact

Week 1 examination leak detector liquid iron, monthly check point of contact

1 time

Bus connection

Poor contact of busbar fastening part

Adjust power factor or phase balance

Overcurrent

Power factor or phase balance imbalance

Adjust power factor or phase balance

Short circuit between mechanical phases

Repair and replace