How to calculate the pressure of PVC lay flat machine?

standards. DINVDE0276? 1001 has been laying of rated voltage U0 / U for 6/10 kv, 12/20 kv and 18/30 kv PVC insulation, insulation described.properties or oiled paper insulated power electricity test pressure test specification JB3373 large high voltage ac motor stator insulation IEEESrd. 433 ultra-low frequency high voltage large rotary motor insulation test DL/T596 power equipment preventive test procedures 3 ultra-low frequency (0.1 HZ) summary of withstand voltage test role ultra-low frequency (0.1 HZ) withstand voltage test is to identify cross-linked polyethylene insulated power cable insulation strength of the direct method, can be used as judgment parameter of cross-linked polyethylene insulated power cable can be important reference basis to continue running. The ultra-low frequency (0.1hz) withstand test is a destructive test. In the test, it is recommended to test the insulation resistance of the test cable by using the 10000v meter, and record the test results. Ultra-low frequency (0.1 HZ) pressure test equipment generally consists of 0.1 HZ output voltage generator, test instructions, shows that the output voltage waveform or frequency of peak voltage and current meter, record test time timer, protect the resistance, length of not less than 30 meters special flexible connection cables and other components. The test equipment must have reliable overcurrent or overvoltage protection function, starting function and built-in discharge function. 4 test equipment of 4.1 4.1 HZ voltage generator 0.1 HZ voltage generator, provide a sine or cosine square wave voltage, can continuous booster, should be less than 1%, the output voltage amplitude instability under its rated voltage, waveform distortion load capacitance capacity not less than 1.5 u F. The waveform of test voltage waveform and frequency test voltage is: a. Sine wave or b. Cosine square wave; The peak function of sine wave should be within the range, and the frequency should be within 0.1hz. The polarity time of the cosine square wave is not greater than 2ms, and the frequency should be within the range of 0.1hz. 4.3 the accuracy level of the instrument ammeter and voltmeter is equal to or higher than 1.5, and is calibrated once a year. 4.4 time division of the timer is 1; 4.5 protect resistance protection resistance value is not less than 100 k Ω, power is not less than 800 w. 4.6 the voltage value of the wire core of the flexible cable connecting cable is not less than 120KV and the length is not less than 30 meters. 5 test program 5.1 the electrical equipment connected with the test cable shall be completely separated from the test cable and the test equipment 5.1 and the ground pole of the test cable shall be fully grounded with bare copper wire. Record test environmental conditions. 5.2 the insulation resistance test was carried out for each phase of the test cable by 10000V Megabyte, and the test value was recorded. 5.3 test voltage peak: 3UO; Test time: 60min 5.4 test cable’s capacitance is within the range of capacitance of the test equipment. When the test cable is connected in parallel,