Siemens APT transformer – common faults and analysis of voltage transformers

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

(1) The insulation between the iron chips is damaged

Problem: The temperature rises during operation.

Possible causes of the problem:

(1) Poor insulation between iron chips

(2) The use of harsh environmental conditions or long-term operation at high temperature to promote the aging of insulation between iron chips.

(2) Poor contact between the grounding piece and the iron core

Fault phenomenon: There is a discharge sound between the iron core and the fuel tank during operation.

The cause of the problem: the grounding lug is not plugged in tightly, and the installation screws are loose.

(3) The iron core is loose

Fault phenomenon: abnormal vibration or noise during operation.

The cause of the problem: the core clamp is not clamped, and the iron chips are loose.

(4) Winding inter-turn short circuit

Symptom:

(1) During operation, the temperature rises and there is a discharge sound;

(2) The high-voltage fuse is fused, and the secondary side voltmeter indication is unstable, high and low.

Causes of the problem:

(1) System overvoltage;

(2) Long-term overload operation;

(3) Aging insulation or poor manufacturing process.

(5) Winding disconnection

Fault phenomenon: During operation, there may be an arc at the disconnection point, there is a discharge sound and the voltmeter indication of the disconnected phase is reduced or zero.

Causes of the problem:

(1) Poor welding process;

(2) The mechanical strength is not good or the lead wire is unqualified, and the winding lead wire is broken.

(6) Winding interphase short circuit

Problem: The fuse on the high voltage side is blown off, the oil temperature increases sharply, and there is even smoke from the fuel injection.

Causes of the problem:

(1) Aging of winding insulation;

(2) The insulating oil is damp;

(7) Insulation breakdown of windings to ground

Problem: The high-voltage side fuse is continuously fused, and there may be a discharge sound.

Causes of the problem:

(1) The winding insulation is aging or there are conductive debris in the winding;

(2) The insulating oil is damp;

(3) Overvoltage breakdown, etc.

(8) Discharge flashover between casings

Fault phenomenon: the fuse on the high voltage side is blown and the bushing flashover is discharged.

Causes of the problem:

(1) Mechanical damage occurs when the casing is subjected to external force;

(2) There are foreign bodies or small animals entering between the casings;

(3) The casing is seriously polluted, resulting in the decline of insulation performance.

Siemens APT transformer – common faults and analysis of voltage transformers

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