Power:Electronic Color:Red Application:Electrics Power supply:220V Warranty:1 Year Function:Detect Type:Vertical
High-voltage test High-voltage testers refer to a class of transformers that generate high voltages for high-voltage tests. The high-voltage test transformer has the characteristics of high voltage, small capacity, short continuous working time, thick insulation layer and grounding at one end of the high-voltage winding. This test transformer uses the power frequency high voltage induced by its secondary side to conduct insulation performance tests on various electrical products and insulation materials.
1. Adopts new design, new material. Small size, light weight, good appear.
2. Adopts high quality cold rolled silicon steel sheets, stacking Multi- layer cylindrical frame core. Use QZ type wire to wind high voltage type coil on special high strength insulation tube, filling SF6 inside.
3. Silicon rectifier is stacked inside of high voltage busing, and alternate frequency HV AC output or HV DC output through the short-circuit rod inserting and extracting.
4. The structure of busing inside is different with Oil type
1) High voltage: The primary voltage of the test transformer is 220V or 380V, but the secondary voltage of a single test transformer often reaches thousands to tens of thousands of volts. Test transformers with a secondary voltage exceeding 750kV usually use multiple cascaded structures.
2) Low current: The rated current of the test transformer is actually the capacitor current of the test object, so it is generally less than 1A. However, the test transformers used for cable and large-scale motor tests, external insulation pollution tests, line corona tests and other projects can achieve several amps of secondary current.
3) Short working time: Due to the short voltage withstand time of the product under test, the test transformer is generally used for short-time work of 0.5h or 1h except for external insulation pollution test, line corona test and cable test.
4) The test transformer is generally a single-phase, indoor device (also made of outdoor devices): all are oil-immersed self-cooled structure, the winding insulation layer is thick, and one end of the high-voltage winding is usually grounded.
5) The insulation level of the first and second ends of the secondary winding of the test transformer is different: the first end is high potential, and the end is directly grounded or grounded through an ammeter.
6) High design and manufacturing process requirements: Due to the high working voltage, the insulation structure has a decisive influence on the overall size of the test transformer. The body is generally required to be vacuum-dried, and vacuum oiled above 100kV.
1) According to the structure, there are iron shell type and insulation shell type test transformers.
2) From the power frequency, there are several frequency-level test transformers for power frequency, frequency doubling, intermediate frequency and high frequency.
3) According to the voltage level, it can be divided into low voltage, high voltage and ultra high voltage test transformers.
4) It can be divided into light mobile and fixed type according to the use form; there are also single use and two or more cascade use test transformers.
The test transformers are generally single-phase, indoor devices, all of which are oil-immersed self-cooled structures. Because of its high operating voltage, its winding insulation is thick, and one end of the high-voltage winding is grounded.
The specific structural types of test transformers are generally single-sleeve type, double-sleeve type and insulation tube type.