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Product — High current temperature rise test system — High current temperature rise test device
Product name：High current temperature rise test device
Executive standard：GB7251.1 Temperature rise test of medium and low voltage complete switchgear and relevant standards of various products
Other name：High current generator, high current transformer, current riser and temperature rise test
Component：Control unit, voltage regulator, high current transformer, data acquisition unit
| Purpose & brief description |
| ● Used for current load test and temperature rise test of 50Hz switch, current transformer and other electrical equipment. It is a destructive test for bad test objects ● Application: power product manufacturing companies, power operation departments, scientific research institutions and colleges and universities. ● Application products: medium voltage switchgear, GIS high voltage switch, cable, current transformer, power transformer, high voltage circuit breaker, capacitor bushing, motor, busbar, etc. |
| Test purpose |
| ● Temperature rise test is currently a type test. ● The traditional temperature rise test assesses the average temperature rise of winding (measured by resistance method) and the temperature rise of oil top layer. If the measured values of these two temperature rises do not exceed the allowable temperature rise limit specified in the standard, the transformer is considered to have passed the type test of temperature rise test. ● However, with the improvement of transformer voltage level, the reduction of large capacity transformer loss, the emergence of optical fiber dimensional temperature measuring device, the development of gas chromatographic analysis technology and liquid chromatographic analysis technology in oil, the content of one of the type test items of temperature rise test function will be increased. ● At present, there is a temperature measurement system for measuring the temperature of the hottest spot of the winding. A sensor is placed near the conductor to send out the signal through the optical waveguide. A certain number of sensors can be embedded to measure the temperature of the hottest spot of the winding and the transient temperature characteristics in the temperature rise test. This is also beneficial to large capacity transformers. ● For transformers with forced oil circulation cooling, the pressure drop of oil circuit can also be measured by temperature rise test to detect whether the pump lift is sufficient and whether negative pressure will occur. ● During the temperature rise test, it is also necessary to detect whether there is local overheating on the oil tank wall, which can be carried out by infrared thermometer. Infrared scanning can be used near the high current bushing and the high current lead to detect whether there is overheating. ● For extra large capacity transformer or high impedance transformer, a certain percentage of rated current shall be applied at the stage of body process, and the temperature distribution shall be detected by infrared thermometer. To monitor the temperature distribution of internal structural members. ● Heat can sometimes lead to oil decomposition and paper aging, which is not only a problem of transformer life, but also related to the safe operation of transformer. Therefore, the increase of temperature rise test content is beneficial and harmless to the reliability of transformer. |
| Technical parameter |
| ● Working power supply; 220V/380V,50/60Hz ● Voltage: 1 -- 20V (can be customized according to user requirements) ● Current: 1 -- 20KA (can be customized according to user requirements) ● Ripple voltage: ≤ 1% rated value + 10mV ● Temperature drift: ≤ 0.04% rated value / ℃ ● Source effect: ≤ 0.3% of rated value ● Time drift: ≤ 1% of rated value ● Load effect: ≤ 1% of rated value (only the change rate of output voltage caused by the change of output current from zero to rated value) |
| Technical features |
| ● The high current generator adopts imported high magnetic conductivity materials, with exquisite design, small volume, strong electric power resistance and convenient use. This series of high current generator is the necessary equipment for places requiring high current in electrical commissioning in all walks of life. The instrument has two test methods: full-automatic test and manual test, which only need to set a simple test current and time. With automatic current stabilizing system. ● You only need to set the target current without manual monitoring. You only need to set the test, current and step size to save the cumbersome labor such as manual voltage regulation, manual recording and curve drawing, so as to reduce the labor intensity and improve the work efficiency. You can also read the data to the computer after the work. ● The imported PC is operated with a real color 10.0-inch large LCD touch screen. The intelligent sensor supporting fieldbus technology is adopted to realize the full digitization of data transmission. The display and operation unit adopts a touch color LCD with full Chinese menu, clear and intuitive interface and simple and convenient operation. The test does not need any external auxiliary equipment, fully automatic control, fool operation, fast, simple and convenient ● It has automatic alarm function for exceeding the limit value and reliable self-protection function for overheating, overcurrent, overvoltage and short circuit. The AC voltage regulating device shall be protected by microcomputer automatic protection control and mechanical micro limit switch to ensure the normal operation of constant current power supply and improve the safety and reliability of products. ● Output current: three-phase absolute balance, and the waveform is standard sine wave ● Three phase homology and each phase can be adjusted separately ● It can be set to long-time current carrying mode according to test requirements. ● Protection: the electronic circuit can quickly detect overvoltage, overcurrent, overtemperature, lack of equality, and automatically trip the protection and alarm device. The voltage in non test state is zero and the current is zero |
Feidian electric energy provides more professional testing equipment and technical services for power transformer, transformer, switch, high-voltage cable, power capacitor, bushing, insulator, lightning arrester, motor and other manufacturers
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Address：Lingang section of Shanghai Pilot Free Trade Zone
Tel：13761804576
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