Urgent defects:

Equipment or facilities directly threaten the safe operation and need to be dealt with immediately, which may cause equipment damage, personal casualties, large-scale power outages, fires and other accidents at any time; the treatment should not exceed 24 hours.

Major flaws:

Those that pose serious threats to people, power grids and equipment, but can still continue to operate, and may cause accidents if not handled in time; should not exceed 15 days (X network requires 7 days).

General flaws:

It will not deteriorate into a major defect within a short period of time, and it can still continue to operate despite its impact on operation; 6 months.

Transformer emergency defect:

The cooling device malfunctions seriously, affecting output or threatening safe operation.

The core grounding current is unqualified and cannot meet the operating requirements even after series resistors are connected, and there is a trend of development.

The body has serious oil leakage or a large amount of oil is sprayed.

The casing leaks oil, the casing oil level exceeds the lower limit, and the seal fails.

The main transformer mailbox is flooded.

The electrical and oil test results seriously exceeded the standards.

The submersible oil pump is damaged and metal objects may enter the fuel tank.

The oil level indication on the transformer body or voltage regulating switch is zero.

Transformer accident:

Each abnormal state continues to develop into a serious state, causing the transformer to trip accidentally.

A phenomenon that does not meet the general requirements for the normal operation of the transformer occurs, and the transformer may be burned out.

The transformer is found to have hidden dangers, flames, loud and uneven noise, or popping sounds.

Transformer catches fire, etc.

When the following abnormal conditions occur in the transformer, the power should be cut off immediately:

Circuit and magnetic circuit system:

The noise of the transformer has increased significantly, which is very abnormal or uneven, and there are explosion sounds inside.

Abnormal noise from transformer:

1) Uneven "buzzing" sound: over-voltage, over-current or phase loss

2) Intermittent "cutting": the load increases sharply

3) Hammering or windy "dinging" or "hoo---hoo---": individual parts are loose

4) A crisper "rustling" and "swishing" sound: The shell collides with other objects.

5) "Hissing" and "chichi" sounds: corona discharge or glow discharge

6) "Crackling" discharge sound: winding short circuit or insulation breakdown. If the winding is severely short-circuited, a huge roar will occur.

7) Abnormal "gurgling" noise in the fuel tank: A short circuit causes local oil to boil.

8) "Boom" sound: It may be that the outlet line on the low voltage side is grounded.

When the following abnormal conditions occur in the transformer, the power should be cut off immediately:

Circuit and magnetic circuit system:

The casing is severely damaged and discharged

Damage and cracks in the casing will reduce the insulation strength, causing further damage to the insulation until complete breakdown; when the water in the cracks freezes, the casing may burst.

Lightning arrester explosion grounding

Faults such as winding short circuit and core ground open circuit

When the following abnormal conditions occur in the transformer, the power should be cut off immediately:

Oil circuit and cooling system:

The fault of the cooling system of the forced oil circulation air-cooled transformer cannot be eliminated in time, and it cannot ensure that enough coolers are put in according to the manufacturer's regulations and the load is large; or the operation exceeds 1 hour after all coolers are removed.

The cooler is fully switched on, and the oil temperature and winding temperature are high and the alarm occurs.

The transformer smokes and catches fire, or the on-load switch smokes and catches fire.

Oil injection into the body or casing, excessive color changes, carbonaceous matter appearing in the oil, etc.

There is serious oil leakage or oil injection in the body or casing, causing the oil level to drop to the lower limit of the oil level indication, etc.

When the following abnormal conditions occur in the transformer, the power should be cut off immediately:

Monitoring and auxiliary systems:

The operation, limit and indicating device of the on-load pressure regulating switch fail, or there is a discharge sound inside the oil chamber of its switching mechanism.

The load on any side of the transformer exceeds the specified multiple and specified time, or under normal load and cooling conditions, the temperature of the transformer is abnormal and continues to rise, causing the top oil temperature to exceed 85°C.

When a fault occurs that endangers the safety of the transformer and the relevant protection device of the transformer refuses to operate.

Other situations that endanger the safety of the transformer or people or those specified in on-site operating procedures, such as fire near the transformer

35kV 20000Kva Oil-Immersed Three-Phase Double Winding Without Excitation Voltage Regulating Power Transformer