Current-Carrying Capacity and Overlapping Area
The latest version of GB/T 5273-2016 (which replaces GB/T 5273-1985) is based on IEC 62271-301:2009. In terms of form and dimensions, it has removed the specification of terminal shapes and sizes, as well as deleted Appendix A (which provided recommended terminal dimensions based on rated current and their connection methods) and Appendix B (which listed […]
Is earthing switch a simple device?
Many people think that the earthing switch is just a simple earthing device. As long as it can be closed and the ground connection can be maintained, it is fine. Therefore, the earthing switch is not taken seriously. The contacts, springs, etc., are made of simple and cheap materials, and the manufacturer does not pay […]
Medium voltage side mounted circuit breaker
Side-mounted circuit breakers are mainly used in air-insulated ring main cabinet circuit breaker program, used in conjunction with disconnect switches to constitute the transformer outgoing protection, also used in other air-insulated circuit breakers Switchgear, compact dimensions, due to the longitudinal arrangement, it can be ensured that in a very small width of the interphase and […]
What is the Lightning Impulse Voltage Test?
Lightning is one of the most powerful electrical phenomena in nature, and its impact on electrical equipment and systems cannot be underestimated. The lightning impulse voltage test is an important means to evaluate the withstand capability of electrical equipment when encountering lightning strikes. By simulating the high voltage and instantaneous characteristics of lightning, researchers can […]
Comprehensive Comparative Analysis of Schneider, Siemens, and ABB Environmentally Friendly Gas Switchgear（SF6 Free RMU)
This is information about the current environmentally friendly switchgear from each of the three major brands (ABB, Schneider, Siemens). The switchgear types are as follows ABB: SafeRing / SafePlus Air Series Schneider: RM AirSeT series Siemens: 8DJH series I. Environmental Performance All three switchgear models adopt environmentally friendly gases, effectively reducing the impact on the […]
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 […]
Grounding switch operation
The MV grounding switch is an important part of the MV switchgear as the grounding protection of the high voltage circuit during maintenance and overhaul. The grounding switch needs to withstand short-term withstand current, peak withstand current, that is, maintenance and repair, grounding switch closed, accidental power supply, the grounding switch needs to be stable […]
Hello 2025 Happy New Year ！
On behalf of GEE Company, we would like to extend our warmest New Year greetings to all. May this new year be a canvas for you to paint your dreams and aspirations. At GEE, we strive to reach new heights, and we hope that you too will soar in every aspect of your life. Wishing […]