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Reasons for Short Circuit of Generator Stator Winding Insulation

Jun. 07, 2022

The generator set is a well-known good helper for emergency power consumption in people's lives, but some users find that the stator winding of the generator set has insulation breakdown and short circuit, so what is the situation? Next, we will analyze the reasons for the insulation breakdown and short circuit of the stator winding of the generator set:

diesel power generator

1. The winding itself is defective or the maintenance process is improper, causing the winding insulation breakdown or mechanical damage. The insulation material should be selected according to the specified insulation grade, and the winding installation and dipping and drying should be carried out in strict accordance with the process requirements.

2. The winding is overheated. After the insulation is overheated, the insulation performance will be reduced, and sometimes it will quickly cause insulation breakdown at high temperatures. Routine inspections should be strengthened to prevent overheating of various parts of the generator set and damage to the winding insulation.

3. The stator winding is damp. For generator sets that have been out of use for a long time or have been overhauled for a long time, the insulation resistance should be measured before being put into operation, and those that fail are not allowed to be put into operation. The damp generator set should be dried.

4. Insulation aging. Generally, the generator set runs for more than 15--20 years, and its winding insulation is aging, the electrical performance changes, and even the insulation is broken down. It is necessary to do a good job in the overhaul and preventive test of the generator set. If the insulation is found to be unqualified, the defective winding insulation should be replaced or the winding should be replaced in time to prolong the service life of the generator set.

5. Metal foreign objects enter the generator set. Do not leave metal objects, parts or tools in the stator chamber after overhauling the generator set; tie the binding wire of the rotor and fasten the end parts to prevent damage due to centrifugal force. loose.

6. Excessive voltage breakdown:

(1) The line is struck by lightning, and the lightning protection is not perfect. Lightning protection facilities should be improved.

(2) Misoperation, such as raising the voltage of the generator set too high when there is no load. The generator should be boosted in strict accordance with the operating procedures to prevent misoperation.

(3) For the internal overvoltage of the generator set, including operating overvoltage, arc grounding overvoltage and resonance overvoltage, etc., the preventive test of the winding insulation should be strengthened, and the defects existing in the stator winding insulation should be found and eliminated in time.

The above content is the reasons for the insulation breakdown and short circuit of the stator windings of the generating set sorted out by Starlight Power Generation Equipment, for the reference of the majority of users.

Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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