Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Preparatory Work Before Adjusting the Tap Changer of H61 Oil Power 26kV Electric Transformer Apply for and issue a work permit; carefully fill out the operation ticket; conduct a simulation board operation test to ensure the operation is error-free; confirm the personnel who will carry out and supervise the operation; if load reduction is required, notify affected users in advance. Before construction, power must be disconnected to take the transformer out of service, and voltage testing must be

1.Causes of Damage to Agricultural H59/H61 Oil-Immersed Distribution Transformers1.1 Insulation DamageRural power supply commonly uses a 380/220V mixed system. Due to the high proportion of single-phase loads, H59/H61 oil-immersed distribution transformers often operate under significant three-phase load imbalance. In many cases, the degree of three-phase load imbalance far exceeds the limits permitted by operational regulations, causing premature aging, deterioration, and eventual failure of th

Five Common Defects of H61 Distribution Transformers1.Lead Wire DefectsInspection Method: The three-phase DC resistance imbalance rate significantly exceeds 4%, or one phase is essentially open-circuited.Remedial Measures: The core should be lifted for inspection to locate the defective area. For poor contacts, re-polish and tighten the connection. Poorly welded joints should be re-welded. If the welding surface area is insufficient, it should be enlarged. If the lead wire cross-section is inade

The Impact of Voltage Harmonics on Temperature Rise in H59 Distribution TransformersH59 distribution transformers are among the most critical equipment in power systems, primarily functioning to convert high-voltage electricity from the power grid into low-voltage electricity required by end users. However, power systems contain numerous nonlinear loads and sources, which introduce voltage harmonics that adversely affect the operation of H59 distribution transformers. This article will discuss i

H61 distribution transformers refer to transformers used in power distribution systems. In a distribution system, high-voltage electricity must be converted into low-voltage electricity via transformers to supply electrical equipment in residential, commercial, and industrial facilities. The H61 distribution transformer is a type of infrastructure equipment primarily used in the following scenarios: Supplying power from high-voltage grids to low-voltage grids: During power delivery, high-voltage

In recent years, the accident rate of H59 distribution transformers has shown an upward trend. This article analyzes the causes of failures in H59 distribution transformers and proposes a series of preventive measures to ensure their normal operation and provide effective assurance for power supply.H59 distribution transformers play a vital role in power systems. With the continuous expansion of power system scale and the increasing single-unit capacity of transformers, any transformer failure n

What lightning protection measures are used for H61 distribution transformers?A surge arrester should be installed on the high-voltage side of the H61 distribution transformer. According to SDJ7–79 "Technical Code for Design of Overvoltage Protection of Electric Power Equipment," the high-voltage side of an H61 distribution transformer should generally be protected by a surge arrester. The grounding conductor of the arrester, the neutral point on the low-voltage side of the transformer, and the

The self-cleaning mechanism of transformer oil is typically achieved through the following methods: Oil Purifier FiltrationOil purifiers are common purification devices in transformers, filled with adsorbents such as silica gel or activated alumina. During transformer operation, convection caused by oil temperature changes drives the oil to flow downward through the purifier. Moisture, acidic substances, and oxidation byproducts in the oil are absorbed by the adsorbent, thereby maintaining oil c

Measures to Prevent H59 Oil Immersed Power Distribution Transformer from Burning OutIn power systems, H59 Oil Immersed Power Distribution Transformer play an extremely critical role. Once burned out, they can cause widespread power outages, directly or indirectly affecting the production and daily lives of a large number of electricity users. Based on the analysis of multiple transformer burnout incidents, the author believes that a considerable number of such failures could have been avoided or

1. OverloadFirst, with the improvement of people's living standards, electricity consumption has generally increased rapidly. The original H59 distribution transformers have small capacity—“a small horse pulling a big cart”—and cannot meet user demands, causing the transformers to operate under overload conditions. Second, seasonal variations and extreme weather conditions lead to peak electricity demand, further causing H59 distribution transformers to run overloaded.Due to long-term overload o