Frequency-tripling generator and withstand voltage test calibration method thereof

Abstract

The invention provides a frequency-tripling generator and a withstand voltage test calibration method thereof. The method includes A. an zero-load test including steps: a1, directly connecting a three-phase 380 V power supply to "A, B and C" input terminals at the backside of a device; a2, inputting a three-phase voltage after confirming the wiring is correct, and turning on a power supply switchof a control box, wherein a power supply indicating lamp is turned on (if not, returning a voltage regulator handle to a zero position); and a3, pressing a start button, turning on a work indicating lamp, starting to rotate the voltage regulator handle for boosting, and observing an output voltmeter until the output voltmeter reaches a full scale, wherein it is indicated that the device is normalif there is no anomaly in the process. The operation is simple, the performance is reliable, the time is more accurately controlled, conditions of an experiment are all in accordance with the standard, the accuracy of experiment results is guaranteed, long operation time is avoided, when an overcurrent or breakdown phenomenon occurs in a boosting process, an overcurrent protection motion can protect a tested sample, the expansion of the accident of the tested sample is prevented, and the damage to detection equipment and detected equipment is avoided.

Description

technical field [0001] The invention relates to the technical field of triple frequency withstand voltage testing, in particular to a triple frequency generator and a method for calibrating the triple frequency generator withstand voltage test. Background technique [0002] According to the national standard "GB311-64" and the "Electrical Equipment Preventive Test Regulations" issued by the former Ministry of Water and Electricity, it is designed to meet the requirements of the power system for high-voltage voltage transformers and frequency-doubled induction withstand voltage test equipment, and is widely used in electric power. The AC withstand voltage test of the system's 35-220KV level voltage transformer is used to assess the main longitudinal insulation strength of the transformer. At the same time, it can also conduct induction withstand voltage tests on the windings of motors and transformers, and can also be used as a 150HZ power supply for short-term operation. The...

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Problems solved by technology

[0005] 1. In the withstand voltage test experiment, three types of equipment, the triple frequency power generator, the supporting control box and the reactor, need to be involved, which increases the cost of the experiment to a certain extent, and is prone to failure during connection. It is troublesome. After the no-load test is completed, it is necessary to reconnect the triple frequency power generator, the control box, the reactor (connected when necessary) and the tested product. Due to the There are many wires, and it is troublesome to connect. For some operators who are just getting started, improper operation of some steps may cause damage to the tested equipment and affect the normal use of the equipment;

[0006] 2. During the test, when the voltage is boosted to the required voltage value of the tested product, the boost should be stopped and lasted for 40 seconds. If there is no abnormal situation, it means that the tested product has passed the test. Return the handle of the voltage regulator to the zero position and quickly disconnect the three-phase power supply. It is necessary to manually use the timing device for timing, because the operator needs to observe the detected settings and factors such as voltage and current at the same time, which may exceed 40 seconds, and may Cause damage to the equipment under test;

[0007] 3. During the test, the coil voltage of the contactor in the control box is 1 / 3 of the output voltage of the triple frequency power generator. It is absolutely not possible to use a 50HZ power supply for trial use. At the same time, the operator needs to find out the capacitance of the tested equipment by himself. The choice of whether to use compensation reactors has higher requirements for operators, and it may also affect the accuracy of the experiment due to improper selection.

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