There are several reasons why a transformer’s temperature may be too high. These can be due to issues with the transformer itself or external factors. Causes of Transformer Overheating Internal Causes When a transformer operates, it reaches a state where heat generation and heat dissipation are balanced, and the temperature of each part stabilizes. If the oil temperature is higher than usual by 10°C or more under the same conditions, or if the temperature rises despite an unchanged load, it can be considered that there is an internal fault in the transformer. 1，Poor Contact of the Tap Changer: During operation, […]

Background information Despite the enduring impacts of the global energy crisis, growth in electricity demand has remained robust in the first half of 2024 due to solid economic activity in many regions, intense heatwaves, and continued electrification. This mid-year update, which follows the Electricity 2024 report published in January, explores this trend and its implications. It features the latest data for 2023 and new 2024 and 2025 forecasts for global electricity demand, supply by fuel type, and carbon dioxide (CO2) emissions from the power sector. It also analyses the latest developments in major markets, including China, the United States, the European Union […]

The design of IEC ring network cabinet, the current Saudi Arabia, Russia and other countries for China-made ring network cabinet demand, various manufacturers are designing related products. IEC standard ring network cabinet requirements generally have a common box, mechanical key interlocking, internal arc pressure release, cable voltage test dedicated interface, outdoor box and its size, etc., each region has different requirements, such as Southeast Asia requires a separate cable connection compartment. Ormazabal Medium voltage switchgear Dedicated cable voltage test interface, the requirements of the cable room without opening the cover, without removing any cable connection casing accessories, etc., for high-voltage […]

Medium-voltage switchgear circuit breaker, equipped with electric remote breaking and closing operation is a basic requirement, spring actuator mechanism circuit breaker to remote breaking and closing, first of all, electric energy storage, the general circuit breaker are equipped with circuit breaker in the closing (regardless of manual or electric), immediately after the energy storage action, the energy storage process does not affect the switch position state, energy storage, the switch can be re-closed again after the split, which is the Circuit breaker to achieve the basic requirements of reclosing, that is, the basic operating sequence: minutes – 0.3 seconds – […]

Currently, environmentally friendly vegetable oil has been applied to high-voltage 220/550kV transformers, achieving good electrical performance and environmental performance. The American box variable seals the switch, transformer and other high-voltage circuits inside the oil tank, which has a compact structure, and can be environmentally friendly and safe through the use of vegetable oil substitution. Realise SF6-free substitution of box transformers. The medium voltage underground distribution station has evolved from a complex structure to a small, compact unit. The evolution of the technology is described below: The two-storey civil building on the first floor accommodates the introduced overhead lines. The ground […]

1 Composition of high voltage switchgear The switchgear cabinet consists of two parts: the cabinet and the handcart. High-voltage switchgear is mainly divided into four parts: busbar room, cable room, handcart (circuit breaker) room, relay instrumentation room. The upper part of the back of the switchgear cabinet is the busbar room, which holds the high-voltage three-phase AC bus and is connected to the static contacts. Fixed guide rails in the breaker compartment allow the trolley to be moved from the test position to the working position and also allow the trolley to be moved from the working position to the […]

Excessive temperature rise, insulation aging, and institutional wear are the three main forms of switchgear failure. Temperature rise and insulation are closely related, one of the main purposes of limiting the temperature rise is to avoid insulation problems, air insulated metal-enclosed switchgear, long term use, due to increased temperature leading to thermal runaway, accelerated insulation aging, which in turn leads to failure of the insulation system. Low-voltage circuit breaker temperature rise standard is based on the material’s heat-resistant temperature level to determine the temperature rise, which is reasonable, the use of high-level heat-resistant insulating materials, the maximum temperature of the […]

Transformer seepage leakage of oil specific hazards 1. transformer oil seepage phenomenon not only seriously affects the appearance, but also because the transformer needs to be shut down to eliminate the leakage and cause economic losses. If the transformer ground base on the more oil, may also become a fire hazard. 2. oil seepage will seriously interfere with the operation and maintenance personnel on the transformer oil storage cabinet sealing condition and oil level meter indication of the correctness of monitoring and judgment. 3. After the oil level is lowered due to oil leakage, the energized joints and switches may […]

Solid insulated ring network cabinet, is the use of solid insulating materials as the main insulating medium of the ring network cabinet, the vacuum interrupter and its conductive connections, isolation switches, grounding switches, main bus and other dominant electrical circuits, single or combination of solid insulating media wrapped and encapsulated into a solid insulating medium with certain functions, and can be combined again and expand the fully insulated, fully sealed module with fully insulated, fully sealed module, the surface accessible to human beings is coated with a conductive or semi-conductive shielding layer, and can be directly and reliably grounded ring […]

Abstract: SF6 gas is a restricted greenhouse gas in the Kyoto Protocol. Some countries and regions have proposed control measures on the use of greenhouse gases, such as the Clean Energy Future Plan launched by Australia, and the EU has banned the use of ≤24kV primary and secondary distribution switchgear with GWP ≥10 fluorinated gases as insulating or disconnecting medium in new and expansion projects from 1 January 2026, and banned the use of ≥10 GWP fluorinated The use of GWP≥10 fluorine-containing gas as insulation or breaking medium ≥24kV, ≤52kV medium-voltage primary and secondary distribution switchgear is prohibited from January […]