How to select and set circuit breaker（low voltage）
Classification of circuit breakers – Frame Circuit Breakers (ACB) Frame circuit breaker is also known as universal circuit breaker, all its parts are installed in an insulated metal frame, often open type, can be equipped with a variety of accessories, replacement of contacts and parts is more convenient, mostly used in the power end of […]
High and low voltage distribution, 100 knowledge
1. What is electricity? Answer:The phenomenon of existence and change of electric charge. Electricity is an important energy source. 2. What is the electric field? Answer: the formation of the field around the charged body, can transfer the interaction between the charged body. 3. What is meant by electric charge? A: The positive or negative […]
Switchgear is too complicated to look at the headache? Five minutes to take you to understand the switchgear!
Switchgear refers to a certain programme of primary equipment, secondary equipment assembled into a complete set of power distribution equipment, mainly used for lines, equipment control, protection. Switchgear can be divided into high-voltage switchgear (fixed and trolley) and low-voltage switchgear (fixed and drawer) according to the voltage level of the inlet and outlet lines. The […]
Medium voltage switchgear testing principles (mechanical tests)
Medium voltage switchgear mechanical tests As an integral step in site acceptance tests, mechanical tests are usually done with the functional tests to test proper signalling and interlocks and save time. In mechanical tests, the commissioning engineer performs mechanical switching of the switching devices, charges the circuit-breaker spring manually with the crank, withdraws the switching […]
Common problems in medium voltage switchgear
Electrical switchgear: how it’s got its name? Many years ago power stations used simple disconnectors, open knife switches, to isolate or de-energize equipment. With the continuous increase in power levels, it became no longer safe to open such disconnectors manually and geared switches were a need which is then combined to be “Switchgear”. Switches didn’t […]