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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.
In contrast to the parallel shunt component, the series component in the circuit diagram represents the winding losses due to the resistance of the coil windings of the transformer. Current, voltage and power are measured at the primary winding to ascertain the admittance and power-factor angle.
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. Now with the help of a variac , the applied voltage is slowly increased until the ammeter gives a reading equal to the rated current of the HV side.
The distance between conductors of the transformer forms a capacitance. Any movement of the conductors or windings will change this capacitance. This capacitance being a part of complex L (inductance), R (Resistance) and C (Capacitance) network, any change in this capacitance will be reflected in the curve or signature. [1]
The primary winding of the transformer is connected to the high voltage or high current circuit, and the meter or relay is connected to the secondary circuit. Instrument transformers may also be used as an isolation transformer so that secondary quantities may be used in phase shifting without affecting other primary connected devices. [1]
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.
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
For example, a transformer with a vector group of Dy1 has a delta-connected HV winding and a wye-connected LV winding. The phase angle of the LV winding lags the HV by 30 degrees. Note that the high-voltage (HV) side always comes before the low-voltage (LV) side, regardless of which is the primary winding.
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