Compensation of power supply capacity for large generator AC voltage withstand test

The phase compensation reactor inductance component test and generator capacitive current in opposite phase, offset in part by test of capacitive current, make the total current test circuit in test equipment is reduced, the capacity is reduced.
The parameters of the reactor to be compensated are determined as follows.
Rated voltage: should be higher than the test voltage.
Rated current: should be greater than the required current compensation.
Rated capacity: according to rated voltage and rated current to determine the rated capacity, and consider to have a certain margin.
Impedance value: determine impedance value according to rated voltage and rated current.
The resistance component and anti P value as the core to be small, the low silicon steel wire, appropriate use of large section to reduce the resistive component.
The test transformer compensation with proper parameters adopts reactor compensation method, and the reactor with appropriate parameters is needed. Test transformer may be appropriate parameters, the low voltage winding short circuit, short circuit impedance characteristics using high voltage test transformer, capacitance current compensation circuit of AC voltage frequency test of generator, vector diagram of reactor compensation to reduce the capacity of the test equipment. The test wiring, such as the equivalent circuit of the 0 compensation test transformer, is shown.
The equivalent circuit diagram of the test circuit is shown.
It can be seen that the compensation principle is the same as that of reactor.
The parameters of the test transformer for compensation are determined as follows.
According to the impedance voltage test transformer impedance voltage to determine the compensation of the test voltage, impedance voltage to strip test voltage, and have a margin.
Rated current: should be greater than the current needed to compensate.
Rated voltage: according to the impedance voltage and the test voltage, so that the impedance voltage is higher than the test voltage.
Rated capacity: determined by rated voltage and rated current, and has a certain margin.
2 using the inductance component parallel compensation should pay attention to the problem, select the appropriate parameters can achieve the purpose of compensation, and prevent the occurrence of current or voltage resonance.
When the test is resonant voltage, circuit, capacitance and transformer test subjects, the regulator, compensation inductor and power conversion to the test voltage side inductance and equal voltage resonance may occur. When the voltage resonance occurs, the voltage on the sample and the current on the power supply side increase. In order to avoid voltage resonance, the parameters of each element in the test circuit should be calculated. The condition of no voltage resonance is: Cx<3.lSX\Q9/wXiCx the maximum allowable capacitance of the sample is X! Test transformer, voltage regulator, compensation inductor and power conversion to the test voltage side inductance values and (n).
The current resonance is the parallel resonance caused by the exciting current of the test transformer or the inductance current of the inductance component, and the capacitance current of the generator. In order to avoid the current resonance, the appropriate parameters of the test transformer and the compensation inductor should be selected. The condition of no current resonance is: the rated capacity of Pe test transformer (kVA); the rated voltage of Ue test transformer (kV); and the parameters that do not occur voltage and current resonance need to be measured. The subjects of capacitance generator can be used or voltagecapacitor bridge current voltage measurement, voltage measurement and time should not be less than the rated voltage of the generator, the generator voltage is not higher than the line, the same wiring and AC withstand voltage test. To measure the short-circuit reactance XK of test transformer, voltage regulator and compensating inductor, it is best to be consistent with the current required for test.
Measuring the open circuit reactance X is best consistent with the voltage required for the test.
The connection should be the same as the AC withstand voltage. Through the actual measurement and calculation, the appropriate test equipment and inductance compensation element should be selected to avoid voltage and current resonance.
Power supply AC voltage waveform test test current, the line voltage, test equipment and inductance compensation element capacity to have a margin, so the test voltage waveform distortion, the AC voltage generator frequency test, have to check the voltage waveform, the harmonic component should not exceed 5% of available electronic oscillograph monitor when necessary.
The AC voltage generator frequency test, capacitive rise, voltage measurement requirements in the test strip compression end direct measurement of voltage. In the process of test, the indicator values of each meter are closely monitored.
The theoretical analysis and practical application results show that the reactor compensation method and test transformer compensation method, the reasonable selection of equipment parameters, can achieve the compensation of large generator power frequency AC voltage test equipment and test power supply capacity of the. It can reduce the capacity of test equipment and test power supply, reduce the current of test circuit, no need to add large capacity test power supply, and save money. Avoid heating test wire and connector, convenient test, safety and can improve the strip test.
Ding Kuichao (1963-), male, bachelor, tea engineers, mainly engaged in electrical maintenance and testing work.
The European Union to promote energy conservation and renewable energy, the European Commission proposed before a "European smart energy" program, in 2003 2006 to invest 215 million euros, the EU countries and regions to support energy conservation and development of renewable energy and energy efficiency in the use of mobile bag.
The EU began to adjust its energy policy in 1991, emphasizing energy conservation and renewable energy use, and introduced corresponding energy plans in 1993 and 1998 respectively. Since the European Union implemented the strategy of sustainable development, more attention has been paid to energy policy