What is a Capacitor Trip Device?
Capacitor trip device [CTD] or capacitor trip unit [CTU] is a device that provide DC source of energy for circuit…
Capacitor bank discharge methods
Capacitor bank can hold dangerous voltage after disconnecting from power system unless discharging devices are connected to the capacitor terminals.…
What is the electrical resistance of human body?
Electrical resistance of human body has been estimated to be 1,000 Ω according to IEEE Std. 80 standard. Resistance is…
What is Separately and Non-Separately Derived System?
A separately derived system is an electrical system in which the service phase (hot) and neutral conductors has no electrical…
What is Main Bonding Jumper and Neutral Disconnect Link?
Main Bonding Jumper [MBJ] is used to connect switchboard neutral bus and switchboard ground bus. MBJ is a very critical…
Over temperature protection using RTD
Temperature is the most common cause behind power system device damage. Expensive devices such as motors and transformers can have…
HOW DOES CT OPEN CIRCUIT PROTECTOR WORK?
Open circuiting secondary side of current transformer [CT] can lead to dangerous voltage build up that can eventually lead to…
Motor Over Temperature Protection
Temperature kills motors. Temperature is the most common cause behind motor damage. A 10-degree centigrade increase in insulation temperature decrease…
Three Phase Current Metering using Two Current Transformers
It is possible to do three phase current measurement using just two current transformers (CT) in electrical systems with neutrals…
WHY ARE CT SHORTING BLOCKS USED?
Current Transformer [CT] shorting blocks are used to bypass CT secondary current flowing to the connected device by inserting a…