How many electrical equipment fault diagnosis methods do you know?


Release time:

2023-08-09

Like the human body, electrical equipment is also a sophisticated and complex system, which may malfunction due to the influence of internal and external forces. Experienced transformer maintenance personnel will also conduct fault diagnosis through "looking, hearing, asking, and hearing". What are the specific methods? This article will answer them one by one for you:

Like the human body, electrical equipment is also a sophisticated and complex system, which may malfunction due to the influence of internal and external forces. Experienced transformer maintenance personnel will also conduct fault diagnosis through "looking, hearing, asking, and hearing". What are the specific methods? This article will answer them one by one for you:

Six diagnosis

The six diagnostic methods are: oral inquiry, visual inspection, ear hearing, nasal smell, hand molding, and surface examination.

The first five are related to the experience level of the transformer maintenance personnel. In order to avoid differences, multiple people are usually consulted at the same time to make judgments. Meter measurement uses electrical instruments to measure the size of certain electrical parameters and compares them with normal values to determine Cause and location of failure.

1. Oral questioning: That is to ask the equipment operators and users about the usage of the equipment, including the operation content, methods and steps.

2. Visual inspection: Visual inspection mainly involves looking at the site and circuit drawings, carefully checking the external condition or operating conditions of the equipment, and checking against the drawings to eliminate problems.

3. Listen, the noise of the transformer is uniform and regular during operation, and its intensity is also low. The abnormal noise of the transformer can be used to determine the problem of the transformer. We will introduce this in detail in a later article.

4. Smell: Different faults will produce different smells, such as overheating, short circuit, and breakdown faults, you may smell a burning smell; internal short circuit, overheating, water ingress, and moisture will also cause the smell of oil samples. Produces sour taste and bad smell.

5. Touch by hand: Touch the relevant parts of the equipment with your hands, and judge the fault based on the temperature and vibration.

6. Meter test: Use instruments to check electrical equipment. Determine the cause of the problem based on the magnitude of certain electrical parameters measured by the instrument.

nine methods

The above six troubleshooting methods can basically determine the "manifest fault" of the transformer, that is, the fault location has obvious appearance characteristics. For some "hidden faults", more sophisticated instruments and scientific methods are required, combined with maintenance. Check the experience level of the personnel. Usually, these methods are also called "Nine Methods".

1. Analysis method: According to the circuit diagram of the electrical equipment, start with the main circuit, then analyze each control loop in turn, then analyze the signal circuit and other auxiliary loops, and determine the scope of the fault through a complete set of processes.

2. Short circuit method: short circuit somewhere in the electrical channel or use a wire to bridge an intermediate link, and determine the fault location based on the location of the short circuit. Note that this method cannot affect the working conditions of the circuit.

3. Open circuit method: Open circuit method, also called circuit breaking method. That is to say, get rid of the downstream load (mechanical or electrical load) connected to the suspected fault point, make it no-load or temporarily connect a false load. This method is mainly used to check overload and low voltage faults.

4. Cutting method: Cut and partition the relevant electrically connected parts to gradually narrow down the suspicious scope. For example, to find the specific grounding point of a certain line, or to find the specific fault point of faulty equipment, the cutting method can also be used.

5. Substitution method: Replace suspected faulty electrical components or parts to reduce the scope of the fault.

6. Menu method: Based on the fault phenomenon and characteristics, list the various causes that may cause this fault in order, and then search and verify one by one until the real cause and location of the fault are found.

7. Comparison method: Compare the relevant parameters or operating conditions of the faulty equipment with normal equipment, and make adjustments or replacements based on the normal ones.

8. Disturbance method: Random faults that occur accidentally in a short time zone can artificially disturb the operating electrical equipment, observe changes in the operating conditions of the equipment, and capture the phenomenon of fault occurrence, such as sudden voltage increase or decrease, increasing Or reduce the load, add interference signals, etc.

9. Fault reproduction method: Find out where the fault is by letting the fault occur again. Since it is live work, it must be confirmed that no accident will occur, or it must be carried out with safety measures in place.

Summarize

The above are the "six diagnoses and nine methods" in the electrical equipment fault diagnosis method. They are not only useful for repairing electrical equipment, but also have certain reference significance for repairing electronic equipment or circuits. Hope it helps you. Of course, it is also recommended to choose a regular and large-scale transformer manufacturer to ensure quality and after-sales reliability!

Related news

undefined

undefined