E-Throttle

Electrical substations part 2 Hi there!  In the first part we just gone through a an overview of an electrical substation. Today we are adding a little bit more about the same...    Have you ever wondered how these high voltage high current power system is controlled and protected properly😌. Protection    As we know all the stuffs in the substation are extremely costly, An aquarate and efficient protection system should be established.  And this is achieved by proper relay coordination and various schemes of protection for every equipments such as transformers, busbars,feeders, generators etc... Relays in control panels Control Equipments such as transformers, generators are controlled in a remote control room located few metres away from the equipment yard,here controlling means the switching of relevant circuit breakers of respective equipment. These are achieved by control circuits which are operating at a low voltage dc( eg 110V dc). ...

We  chose realys to watch over us, and they does it by any invincible power ? Not at all they are specifically programmed by us for the specific protection  application then how do we do it ? Thats worth something more and we will look into this now . Lets start with the over current protection setting related thoughts. Basically the Relays doesn't prevent the appearance of faults.It can take action only after the fault has been occurred and initiate the opening of switchgear in order to isolate the fault part from the system, so we  must approach into the setting calculation by considering the fault conditions.As the fault discrimination shall have to pick only the faulty part and leave all other part in normal condition, we chose three typical techniques by current, by time and by a combination of current and time. Discrimination by 1.Current It is based on the current at the time of fault and varies according to impedance of the power system elements.B...