Fault Causes of Test Transformer Prone to Occurrence and Maintenance Plan

Test transformer failure prone to failure and repair program 1) short circuit damage accident. Various short-circuit accidents that the transformer suffers during operation, such as a single phase, two phases, or two opposite grounds, a short circuit between three phases, with the shortest at the outlet being the most serious. Daily inspections. When the transformer is in operation, daily inspections are required. It is mainly to check whether the operation condition of the transformer auxiliary equipment is good and whether the transformer temperature is normal. Using infrared imager measurements, can effectively find some internal faults such as transformer overheating, lack of oil.

2) Insulation accident. Transformer insulation damage accounted for about 70% to 80% of the total accidents. There is mechanical damage or overheating that causes insulation damage. Also, the insulation strength at the time of delivery does not meet the requirements or the insulation is damaged so that the strength cannot be reduced to meet the requirements of the bearing capacity. The reasons for the analysis are as follows:

1 The transformer is flooded with water. There are mainly poor watertight sealing of the end of the casing, water leakage in the water cooler, condensation in the explosion-proof cylinder, and accumulation of stagnant water in the oil storage cabinet. The presence of moisture will reduce the breakdown strength of the transformer insulation oil and cause insulation accidents. The insulation accidents will be caused by windings, leads, and screens. The development of creepage will lead to short circuits between the turns.

2 foreign matter remaining in the transformer. Residual metal conductor foreign matter and impurities in the transformer body, due to the occurrence of partial discharge or insulation wear, in the event of overvoltage or under normal operating voltage caused by insulation breakdown damage.

3 Lightning strikes. The lightning protection level of transformers in the low-voltage side of the transformer is too low and the insulation structure of the transformer is weak, causing a short-circuit accident of the transformer during lightning strikes.

3) Overheating fault. There are overheating caused by abnormal currents, such as overheating caused by circulating currents and eddy currents, overheating due to an increase in conductive loop resistance, overheating due to heat dissipation, and the like.

Second, the daily inspection of transformers, periodic test and maintenance conditions 1) online detection technology.

1 Partial discharge online monitoring technology. Transformer internal fault or poor operating conditions, due to high local field strength and partial discharge, partial discharge detection, can be divided into electrical measurement method and non-electric measurement method.

2 On-line analysis of gas in oil. For a long time, the gas chromatographic analysis of gas components and contents in oil-immersed transformer oil has been an important means of judging the internal state of the transformer. The principle is to use the relative ratio of the collected gas concentrations to predict the cracking conditions of the oil or oil paper insulation.

2) daily inspections. During the operation of the transformer, daily inspections must be performed. It is mainly to check whether the operation condition of the transformer auxiliary equipment is good and whether the transformer temperature is normal. Using infrared imager measurements, can effectively find some internal faults such as transformer overheating, lack of oil.

3) Periodic tests. Mainly in accordance with the "electric power equipment handover and preventive testing procedures". There are 35 items in total, and there are 10 items in the routine experiment. Some projects insist on the implementation of some failures that can effectively detect transformers, and timely adoption of effective measures can avoid the expansion of accidents. This is an effective means of production.

Dear Customer:

Thank you for your attention to our products. In addition to this product introduction, the company also has insulation ladders, high-voltage insulation mats, cable fault testers, high-voltage measuring instruments, insulation boots gloves pressure test equipment, power safety equipment cabinets, etc. Introduction, if you are interested in our products, welcome to inquire. Thank you!

We can produce the A/SA106B/C steel pipes according to the ASME SA106 and ASTM A106 standards, and we have been sold about 250000 MT the oversea markets at recent 10 years. YC has been granted a number of approval certificate by international institutions, such as Nuclear pipe certificate, 914mm Cylinder certificate, API monogram and certificate, ISO9001 by TUV NORD, ISO14001/OHSAS18001 by CQC, approvals from Shipping Classification Bureaus like DNV, RINA, ABS, Lloyd, GL, Bureau Veritas, and permit of exporting to Europe as PED 2014/68/EU and AD 2000 certificates for pressure pipes, CPD (Construction Products Directive), etc.


Chengde have been working on the research.manufacture and sale of seamless pipe about 30 years, and the advantage of core competence is more prominent by integrate in technical.management and market with PCC.

1 The Piercing and rolling technology of Chengde possesses a number of patents in designing and manufacturing the equipment. The production is efficient and flexible, and the quality is stable.

2 The material grade is complete, and the size range is wide (three produce line can manufacture all non-standard sizes).  The Minimum Order Quantity (MOQ) as low as ONE piece, and the date of delivery is short with excellent cost performance.

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