Many of the sensuous and capacitive device and the magnetic circuit will have storage capacity of nature.Usually, the energy field will be converted into other energy forms, sometimes the energy to be released into the high-voltage pulsed power distribution system, Moreover, this release is often (as in the electrical activation process) Because the high-voltage pulse through the distribution system will enter the power-line equipment, and the distribution of all insulation system (including internal insulation products) must have sufficient strength to resistance -- not only bear the normal voltage, and to withstand normal pressure system off. Therefore, Product of the insulation must be able to withstand high-pressure test to determine the distribution system there had been high-voltage pulse is not the role of insulation be penetrated.
Several commonly used definitions :
-- Discharge destructive : solid, liquid, gaseous medium and the composition of the high dielectric voltage, the dielectric loss of strength. Discharge destructive, the bridge was completely discharge test insulation, the electrode voltage decreased rapidly to zero or close to zero.
-- Flashover : Dielectric along the surface of the devastating discharge.
-- Spark discharge : in the gas or liquid medium of destructive discharge.
-- Breakdown : Solid in the medium destructive discharge.
-- Ripple : Ripple voltage is the arithmetic average of cyclical fluctuation.
Ripple ranges : Ripple minimum and the maximum deviation of 50%.
Test voltage imposed : Ban on goods from the applied voltage should be sufficiently low voltage, to prevent the operation of the transient process of any over-voltage, should then be slowly increased voltage in order to be able to accurately instrumentation readings, but not too slow. avoid close to the test voltage at the test materials withstand voltage long time.
For the type test, if the test voltage is 75% to 5% test voltage per second rate rise usually meet those requirements. Test voltage will keep to the prescribed time, rechargeable power supply cut off, Resistance by the appropriate filter capacitor and test products to reduce the discharge voltage.
Achieve steady-state test of time depends on the goods components resistance and capacitance.
Steady up to the required voltage, the voltage maintain 1min If the test is not sinusoidal voltage at the same voltage amplitude of the RMS value than the sine wave at higher Insulation prone to breakdown. Test voltage of the higher frequency, voltage, the greater the long dielectric insulation from the heat more, happen the greater the likelihood of
breakdown.
-- Anti-strength test voltage waveform for two half-wave approximation of the same sinusoidal peaks and root-mean-square-value ratio should 21/2-spectrum within ± 0.07, to meet these requirements is that the high voltage waveform test results from the effects of Miyazaki. Throughout the course of the test voltage test measurements should maintain the specified voltage within ± 1%. When the trial lasted more than 60s, Throughout the trial process of the test voltage measurements can maintain a specified value within ± 3%. PFC power supply test equipment recommended 60Hz AC voltage test may be closer to actual usage status of the results.
Test steps :
-- Function : The main function of the machine is normal, the output voltage can be accurately whether it added to the test materials. First determine the voltage required to impose values and the setting up of the leakage current limit alarm, Then a standard resistance test equipment and whether the output voltage shows voltage line Instrument Test Fixture and connectivity whether intact, leakage flow settings can correct warning. For example, 3000V AC test required by the test sample, the police set the leakage current limit of 10mA, is available in a standard 300k ohm resistor to verify that the standard resistor connected to the output terminal pressure, When the output voltage of 3000V at just over pressure alarm instrument correctly and the correct voltage. End function tests should be functional check records, the average daily requirements of the morning or afternoon for the first test required function. -- Commodities connection : put on trial insulation materials bed, first connecting the earth pressure NG folder to the output terminal of the test materials were tested insulation touch-prone, Pressure Instrument then high voltage output terminal connected to the folder insulation were tested at the other end Such as : general test sample of a circuit between the casing and insulation strengthening, put pressure instrument earth terminals connected to the shell folder. put pressure NG high voltage output terminal connected to the power source folder primary (usually plug on).
-- Imposed voltage : voltage applied, not too fast, not too slow Test voltage imposed from the specific standards, in the frequency and scope of 45~65Hz has nothing to do with frequency, If the equipment does not provide standards for the imposition of the test voltage, Voltage tolerance is time for the 60s (in the test voltage to maintain 60s) The standard tolerance for 60s.
-- Experiment : test at the end, the Power cut off the pressure, and then rotating voltage regulator knob, output voltage down to zero, through the appropriate resistor and capacitor filter from the test materials to reduce the discharge voltage, Finally removed first high voltage test kits, which are removed after the test folder to remove test materials.
