Baoding dry transformer dc resistance tester, dc resistance tester, direct resistance tester, inductive load dc resistance tester, etc. Title: Transformer DC Resistance Tester. Baoding dry transformer dc resistance tester is a new instrument for measuring the dc resistance design of large-capacity dry transformer. It is a high-precision stable current power supply and testing part designed as a whole. During the testing process, it is controlled by microcomputer and can automatically complete stable current judgment, data collection, data processing, resistance value display and printing. The instrument can be used for longitudinal testing of the load regulator, which can fully save the test time. It also has a temperature rise test function for baoding dry type transformer manufacturers. It can be used for rapid and accurate measurement of various types of baoding dry type transformers. The measurement method and matters needing attention of the dc resistance tester of baoding dry transformer are described below.
Measurement method of the direct current resistance tester of al - tech dry transformer
Measuring dc resistance is an important project in baoding dry transformer test. Through measurement, the electrical circuits of the equipment can be checked for defects such as poor contact, welding, coil failure and wiring errors. In the actual measurement of medium and small baoding dry transformers, the dc bridge method is mostly adopted. When the resistance value of the tested coil is above 1 euro, the single-arm bridge is generally used to measure, while the one below 1 euro is used to measure with the two-arm bridge. When using the wiring of the two-arm bridge, the potential pile head of the bridge should be close to the measured resistance, and the current pile head should be connected to the potential pile head.
Before measurement, should first to estimate the resistance value of the measured coil, chose bridge rate button in the appropriate position, will not be measured coil short circuit and grounding, charging and then open the power switch, after being sufficient electricity to press the galvanometer switch, quickly adjust measuring arm, make to the galvanometer galvanometer pointer scale in the middle of the zero line direction, fine-tuning, stay smooth pointer settled on zero recorded when resistance, at this point, the measured coil resistance value = number of ratio by measuring arm resistance. After the measurement, open the galvanometer button first and then turn off the power switch.
Matters needing attention of the dc resistance tester for the baoding dry transformer
In the measurement process, in addition to strict compliance with electrical safety regulations and equipment test regulations, special attention should be paid to:
1) in the case of coil temperature stability is measured, the requirements on the dry type transformer oil tank, the lower the temperature difference of no more than 3 ℃;
2) due to the existence of inductance in the transformer coil of baoding dry type, the charging current during the measurement is not very stable, so it must be counted after the current is stable. If necessary, measures should be taken to shorten the charging time.
3) reduce the contact resistance of the conductor in the test loop as much as possible. The baoding dry type transformer tap joint in operation is often affected by oil film and other contaminants, which may cause poor contact. It is generally necessary to switch it several times before measuring, so as to avoid any discrimination error.
4) when measuring the low-voltage side of baoding dry type transformer, all personnel should keep a proper safe distance from the high-voltage side;
5) the instrument should avoid the impact of strong vibration, direct sunlight and magnetic field during transportation, storage and work. When the instrument is stored and kept, it should pay attention to the ambient temperature and humidity. It should be placed in a dry, ventilated and non-corrosive atmosphere.
Baoding zhongyi electric material manufacturing co., LTD is a professional manufacturer of transformer for baoding transformer factory. It has professional production equipment, hoisting, tooling and testing equipment, and has established a perfect quality management system.
Main products of the company: baoding dry type transformer, baoding box type transformer, baoding oil immersed transformer, baoding high and low voltage complete sets of equipment. I companies to follow "detail decides success or failure, honesty molded the future" of the enterprise purpose, adhere to "quality measuring market, seek development by innovation, to management for efficiency" business philosophy, to make my company's products are widely used in power plant, chemical, construction, mining, metallurgy, rail transportation and other industries, to meet the needs of various users, my company rely on superior product quality, thoughtful service, won the trust of our customers.
