What CMC 356?
What CMC 356?
The CMC 356 is the universal solution for testing all generations and types of protection relays. Its powerful six current sources (three-phase mode: up to 64 A / 860 VA per channel) with a great dynamic range, make the unit capable of testing even high-burden electromechanical relays with very high power demands.
What is a relay test set?
Protective Relay Test Sets. Switchgear, or relay testers, are ideal for testing Single, 3, 4 and 6 Phase protection relay systems. Ensure the reliability and safety of power systems during the installation and commissioning process and as part of ongoing maintenance. Manual and automated relay test…
What is a secondary injection test?
The secondary injection test simulates the current and voltage transformer secondaries, by injecting single-phase or three-phase currents and voltages into relays, devices o into the secondary circuits, performing all the corresponding checking and testing with normal and fault conditions.
What is relay calibration?
The law requires that these relays are tested and calibrated once in 2 years. This causes the relay to open the main Switch (called a Circuit Breaker) when the current goes high. This can prevent electrical fires as well as serious short circuits and electrocution.
What is primary injection kit?
Primary Injection Test Kit is the most suitable testing Kit for checking the over-current trip relays. The Kit is attached to a circuit breaker. With the injection of a predetermined current in the circuit breaker, it is possible to check if the relay of the current will trip or not.
How do I test a CT?
The winding resistance of a current transformer is found by dividing the voltage drop across the winding (measured from dc milli voltmeter) with the applied dc current through the winding. The CT should be demagnetized after the completion of winding resistance test.
What is pick up value of relay?
When a relay operates to open a “b” contact or to close an “a” contact, we say that it “picks up,” and the smallest value of the actuating quantity that will cause such operation, as the quantity is slowly increased from zero, is called the “pickup” value.
What is time dial in relay setting?
The time dial setting adjusts the time delay before the relay operates whenever the fault current reaches a value equal to, or greater than, the relay current setting.
What is CT burden?
The burden of the CT is the resistive load used to create the voltage on the output. It varies with turns ratio, desired output and current rating of the primary.
