DC resistance tester is called DC resistance tester, direct resistance tester, inductive load DC resistance tester and so on. English name: TransformerDCResistanceTester. Transformer DC resistance tester is a new type of instrument designed to measure the DC resistance of large-capacity transformers. It is a high-precision, steady-state power supply and test part that is designed as a whole. The test process is controlled by a microcomputer, and the steady flow judgment, data acquisition, data processing, and resistance are automatically completed. Value display and print. The instrument can be completed with one-time power supply for the on-load voltage regulator longitudinal test, fully saving test time, and set up a temperature rise test function for the transformer manufacturer. It can quickly and accurately measure various types of transformers, with simple operation, high precision, Anti-jamming and other features.
Now introduce the measurement methods and precautions for the transformer DC resistance tester.
1. Measuring method of transformer DC resistance tester Measuring DC resistance is an important item in the transformer test. Through the measurement, it can be checked whether the conductive loop of the device has defects such as poor contact, poor welding, coil failure, and incorrect wiring. In the actual measurement of small and medium-sized transformers, most of them use the direct current bridge method. When the resistance value of the tested coil is more than 1 ohm, it is usually measured by a single-arm bridge, and when it is less than 1 ohm, it is measured by a double-arm bridge. When using two-arm bridges, the potential head of the bridge should be close to the measured resistance, and the current head should be connected to the top of the potential pile head. Before measuring, first estimate the resistance of the coil under test, place the bridge override button in the appropriate position, short-circuit and ground the non-tested coil, and then turn on the power switch to charge. Press the galvanometer switch after sufficient power. Quickly adjust the measuring arm so that the galvanometer hand moves towards the zero line in the middle of the galvanometer scale, fine-tune it, and record the resistance value when the pointer is stationary at the zero position. At this time, the measured resistance value of the coil = magnification × Measurement arm resistance. After the measurement is completed, open the galvanometer button and then release the power switch.
2. Notes on Transformer DC Resistance Tester During the measurement process, in addition to the strict observance of electrical safety regulations and equipment test procedures, special attention should also be paid to:
1) When the coil temperature is stable, the temperature difference between the upper and lower parts of the transformer tank should not exceed 3°C;
2) Since the transformer coil has inductance, the charging current during measurement is not stable, and must be counted after the current is stable. If necessary, measures must be taken to shorten the charging time. 3) Minimize the wire contact resistance in the test circuit. The transformer tap is often exposed to poor contact due to oil film and other dirt. Generally, it needs to be measured several times before switching to avoid discriminating errors.
4) When measuring the low-voltage side of the transformer, all personnel should maintain a proper safety distance from the high-voltage side.
5) The instrument should avoid strong vibration, direct sunlight and magnetic field during transportation, storage and work. When storing and keeping the instrument, attention should be paid to the ambient temperature and humidity. It should be suitable for dry, ventilated, non-corrosive gas. When exposed to moisture, rain, or sun exposure, use it gently and gently. Do not drop it.
Shanghai Miyuan Electric Co., Ltd. produces and sells the following products: ZGF DC high voltage generator, high voltage voice phasor, DC resistance tester, battery load tester, loop resistance tester, microcomputer relay protection tester, grounding resistance Tester, high-voltage wireless nuclear phase analyzer, high-voltage test transformer, DC single-arm double bridge, DC high-voltage generator, tubular electric heater, dielectric oil dielectric strength tester, watch-type near-electricity alarm, zinc oxide arrester tester , Insulation Resistance Tester, High Voltage Megaohmmeter, High Voltage Insulation Mat, Short Circuit Grounding Cable; Portable Dynamic Balance Measuring Instrument, On-the-Spot Dynamic Balance Measuring Instrument, Long Range Infrared Thermometer, High Voltage Insulation Mat in Distribution Room, Transformer Loss Parameter Intelligent Test Instrument, insulation boots gloves pressure test device, transformer characteristics integrated test bench, tie rod flow meter, ultra high voltage withstand tester, three-phase multi-phase volt ammeter, intelligent dielectric loss tester, intelligent loop resistance tester, Lightning counter calibrator, transformer on-load switch parameter tester, mine cable fault detector, zinc oxide arrester detector, dip In-line tubular electric heater, DC resistance meter, digital ground resistance meter, portable digital vibration meter, infrared thermometer, frequency conversion series resonant test device, high current generator, vacuum oil filter manufacturer, voltage resistance tester, Wireless high-voltage nuclear phase meter and so on.
Now introduce the measurement methods and precautions for the transformer DC resistance tester.
1. Measuring method of transformer DC resistance tester Measuring DC resistance is an important item in the transformer test. Through the measurement, it can be checked whether the conductive loop of the device has defects such as poor contact, poor welding, coil failure, and incorrect wiring. In the actual measurement of small and medium-sized transformers, most of them use the direct current bridge method. When the resistance value of the tested coil is more than 1 ohm, it is usually measured by a single-arm bridge, and when it is less than 1 ohm, it is measured by a double-arm bridge. When using two-arm bridges, the potential head of the bridge should be close to the measured resistance, and the current head should be connected to the top of the potential pile head. Before measuring, first estimate the resistance of the coil under test, place the bridge override button in the appropriate position, short-circuit and ground the non-tested coil, and then turn on the power switch to charge. Press the galvanometer switch after sufficient power. Quickly adjust the measuring arm so that the galvanometer hand moves towards the zero line in the middle of the galvanometer scale, fine-tune it, and record the resistance value when the pointer is stationary at the zero position. At this time, the measured resistance value of the coil = magnification × Measurement arm resistance. After the measurement is completed, open the galvanometer button and then release the power switch.
2. Notes on Transformer DC Resistance Tester During the measurement process, in addition to the strict observance of electrical safety regulations and equipment test procedures, special attention should also be paid to:
1) When the coil temperature is stable, the temperature difference between the upper and lower parts of the transformer tank should not exceed 3°C;
2) Since the transformer coil has inductance, the charging current during measurement is not stable, and must be counted after the current is stable. If necessary, measures must be taken to shorten the charging time. 3) Minimize the wire contact resistance in the test circuit. The transformer tap is often exposed to poor contact due to oil film and other dirt. Generally, it needs to be measured several times before switching to avoid discriminating errors.
4) When measuring the low-voltage side of the transformer, all personnel should maintain a proper safety distance from the high-voltage side.
5) The instrument should avoid strong vibration, direct sunlight and magnetic field during transportation, storage and work. When storing and keeping the instrument, attention should be paid to the ambient temperature and humidity. It should be suitable for dry, ventilated, non-corrosive gas. When exposed to moisture, rain, or sun exposure, use it gently and gently. Do not drop it.
Shanghai Miyuan Electric Co., Ltd. produces and sells the following products: ZGF DC high voltage generator, high voltage voice phasor, DC resistance tester, battery load tester, loop resistance tester, microcomputer relay protection tester, grounding resistance Tester, high-voltage wireless nuclear phase analyzer, high-voltage test transformer, DC single-arm double bridge, DC high-voltage generator, tubular electric heater, dielectric oil dielectric strength tester, watch-type near-electricity alarm, zinc oxide arrester tester , Insulation Resistance Tester, High Voltage Megaohmmeter, High Voltage Insulation Mat, Short Circuit Grounding Cable; Portable Dynamic Balance Measuring Instrument, On-the-Spot Dynamic Balance Measuring Instrument, Long Range Infrared Thermometer, High Voltage Insulation Mat in Distribution Room, Transformer Loss Parameter Intelligent Test Instrument, insulation boots gloves pressure test device, transformer characteristics integrated test bench, tie rod flow meter, ultra high voltage withstand tester, three-phase multi-phase volt ammeter, intelligent dielectric loss tester, intelligent loop resistance tester, Lightning counter calibrator, transformer on-load switch parameter tester, mine cable fault detector, zinc oxide arrester detector, dip In-line tubular electric heater, DC resistance meter, digital ground resistance meter, portable digital vibration meter, infrared thermometer, frequency conversion series resonant test device, high current generator, vacuum oil filter manufacturer, voltage resistance tester, Wireless high-voltage nuclear phase meter and so on.
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