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A high voltage circuit breaker plays a crucial role in power systems by protecting electrical equipment from damage due to electrical faults in the system. One of the key challenges in circuit breaker design is dealing with the transient recovery voltage (TRV), a phenomenon that occurs immediately after current interruption. When a fault current gets … Read more
SF6 Gas Properties Before we begin the actual discussion on the SF6 circuit breaker, we need to recall some basic knowledge about SF6 gas. This is because SF6 gas is the key component of the SF6 circuit breaker. So, we call these circuit breakers SF6 circuit breakers. These belong to gas-insulated circuit breakers. Here, SF6 … Read more
Lifespan and Environmental Impact of SF6 Gas SF6 can stay in the atmosphere up to 3200 years. So, the atmospheric life of SF6 gas is immense. You cannot see it, you cannot feel it, you cannot smell it. The global warming potential is currently 24,000 times more than \(CO_2\). What do I mean by global … Read more
Here, in this post, we have discussed the DC Control Circuit of an SF6 Circuit Breaker. Selective DC Supply for High‑Voltage Circuit Breakers A circuit breaker’s control power always uses DC. In high‑voltage installations (132 kV and above), designers often choose a selective DC supply. In this scheme, two separate DC sources, Supply 1 and Supply 2, feed … Read more
A vacuum circuit breaker is a current interruption device that uses vacuum as the arc-extinguishing medium. When the contacts open, the arc is quickly extinguished due to the absence of a proper medium in the vacuum. We commonly refer to a vacuum circuit breaker as a VCB. We’ll cover here how they work, why they’re … Read more
Type Tests of a 33/0.415KV Station Service Transformer There are mainly three standards we follow for testing of a Station Service Transformer. These are IS : 1180 part 3 – 2021, CEA Guideline and CBIP Manual. Type Tests According to IS : 1180 part 3 – 2021 According to the latest version of IS 1180 … Read more
We measure the reactive power in VAR. Obviously, here V stands for volts and A stands for amperes. Whereas, R denotes reactive. A power transmission network deals with much larger reactive power. So, normally, we express the reactive power in MVAR. Obviously, 1 MVAR equals one million VAR. What is reactive power? The reactive power … Read more
The transformer differential protection belongs to the unit protection scheme. A unit protection confines itself within a defined zone. A differential protection scheme compares the vector sum of currents entering and leaving the protected equipment. In other words, it uses Kirchhoff’s current law. Under healthy and external fault conditions, the currents entering and exiting the … Read more
Location of Capacitor Banks It is always desirable to connect a capacitor bank as close as possible to the load. This optimizes the use of the capacitor bank. Whenever we connect a load to the power system, the capacitor associated with that load also becomes connected to the system. The capacitor cancels out the reactive … Read more
Let us have a detailed discussion on the Quality Factor and Dissipation Factor. We also call these two factors the Q factor and the D Factor. What is Quality Factor or Q Factor? The Quality Factor, or Q factor, is the dimensionless parameter that describes the efficiency and sharpness of the reactive components. The reactive … Read more