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Contact resistance meter Measures the contact resistance of a power switching devices. Circuit breaker analyzer: Measures the parameters of a circuit breaker. Grounding resistance tester: Measures the parameters of a soil for grounding application. Transformer oil tester: Measures the parameters of an oil in a power transformer.
The secondary of the transformer is left open-circuited. A wattmeter is connected to the primary. An ammeter is connected in series with the primary winding. A voltmeter is optional since the applied voltage is the same as the voltmeter reading. Rated voltage is applied at primary. [1]
A change in winding position, degradation in the insulation, etc. will result in change in capacitance or inductance thereby affecting the measured curves. [ 2 ] Tests are carried out periodically or during major external events like short circuits and results compared against the initial signature to test for any problems.
A connection on a transformer which has equal voltage to either end of the transformer winding. ceramic resonator A piezoelectric element used to stabilize the frequency of an oscillator. channel Any communication path between a signal transmitter and a signal receiver, or, a pre-selected operating frequency for a radio system. channel capacity
Transformer winding primary (usually high-voltage) connecting wires are of many types. They may be labeled as H 1, H 2 (sometimes H 0 if it is internally designed to be grounded) and X 1, X2 and sometimes an X 3 tap may be present. Sometimes a second isolated winding (Y 1, Y 2, Y 3) (and third (Z 1, Z 2, Z 3) may also be available on the same ...
Accurate measurement of low currents (a few milliamperes) with a current transformer clamp is more difficult. The range of any given meter can be extended by passing the conductor through the jaw multiple times. For example a 0–200 A meter can be turned into a 0–20 A meter by winding the conductor 10 times around the jaw's core.