Using line current directly for measurement and relaying purposes is impossible without using Low Voltage Current Transformers. This transformer which is most commonly known as ‘LV CT’ is a piece of electrical equipment that is used to convert line current into small standard current values. The standard current value generated by an LV CT is suitable for the devices to which it is connected i.e. meters, measuring instruments, and protection relays. In the market, common types of CT available are in different types, such as Ring Type, Window Type, Rectangular Type, Interposing Type, Oval Type in resin cast, tape wound & ABS molding. In general, 100A to 3000A is the standard value of primary current in LV CT.
Basic Functions of Low Voltage Current Transformers
- Reducing line current to a value that is appropriate for standard measuring instruments
- Isolating measuring instruments, relays, meters, etc. from line voltage of an installation
- Protecting measuring devices against short circuit currents
- Sensing abnormalities in current
- Giving current signals to protective relays for isolating defective system
Basic Facts to Know About
While Wound Primary Construction is preferred for lower ratio and high accuracy CTs, Ring Type Construction is required for higher ratio CTs. these CTs are economical from an economic point of view. Ring Type CTs are considered the most cost-effective solution if the primary current is 200 A or more. These types of transformers are generally insulated with Epoxy Resin or Cotton Tape and are majorly used in electrical systems for metering and protection. In addition, a wound current transformer is most suitable for switch gears, electrical generators, indoor or outdoor control panels, and control instruments.
Buying Low Voltage Current Transformers
The most feasible platform to buy an electrical system for metering and protection is online. Many Low Voltage CT manufacturers are available in India that can help you with the best quality and long-lasting LVs. Call this number +91-9958904598 to talk to experts at Macroplast, an ISO 9001:2015 certified company engaged in Designing, Manufacturing & Testing excellent quality Transformers since the Year 1983.
