The latest edition GB/T1984-2024 High-voltage AC Circuit Breaker Main revision content
The latest version of GB/T1984—2024 High-voltage alternating-current circuit-breakers (IEC62271-100:2021, High-voltage switchgear and controlgear—Part 100: Alternating-current circuit-breakers, MOD) was released on 2024-09-29 and will be implemented on 2025-04-01. The main revisions are as follows: Deleted terms and definitions such as “indoor switchgear and controlgear, outdoor switchgear and controlgear, earth fault factor, self-restoring insulation, non-self-restoring insulation, cable […]
Detection method of vacuum degree of Vacuum Interrupters
Vacuum circuit breakers have several advantages, including high interrupting capability, excellent arc-extinguishing performance, long mechanical and electrical life, low maintenance workload, and extended maintenance intervals. Therefore, vacuum switches are widely recognized by users. The vacuum degree of the vacuum interrupters is a crucial technical indicator that ensures the insulation and arc-extinguishing performance of the switch. […]
About the switchgear in several different circuit breaker forms
In switchgear applications, the withdrawable structure of circuit breakers can be divided into three main types, as detailed below: As mentioned earlier, fixed switchgear has the disadvantage of being difficult to overhaul when the circuit breaker fails, leading to prolonged power outages. Therefore, withdrawable circuit breakers better meet customer requirements. Is the center-mounted, horizontal draw-out […]
About Ring Main Unit Gas Tank
1.What’s a ring main unit gas tank? In a ring main unit, the gas tank is a crucial component. The interior of the ring main unit gas tank is typically filled with insulating gases such as sulfur hexafluoride (SF6), dry air, or nitrogen. These gases are used to isolate and protect the internal electrical components, […]
About Ring Main Unit: The Key Equipment in Modern Power Distribution
In today’s power distribution field, the Ring Main Unit (RMU) plays a crucial role. It is a factory-assembled metal-enclosed switchgear widely used in the power supply systems of various infrastructures, including high-rise buildings, industrial facilities, and residential communities. A deep understanding of the RMU is of great significance for optimizing power distribution decisions. 1. Definition […]
About Switchgear
1. The Essence of Switchgear Switchgear, in its simplest form, is a collection of electrical devices that work in harmony to control, protect, and isolate electrical equipment within a power system. It serves as the first line of defense against power surges, short circuits, and overloads, safeguarding the integrity of the entire electrical infrastructure. 1.1 […]
Analysis of Reasons for High Transformer Temperature
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 […]
Electricity Market Report – Mid-Year Update
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 […]
Design of IEC standard ring main unit
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, […]
Electric operation of medium voltage switchgear
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, […]