Product Details

Working Principle

1. AC, AC/DC Test Transformer:

Input the power frequency power supply into the operation box (or operation console), and adjust the voltage through the auto voltage regulator to input into the primary winding of the test transformer. According to the principle of electromagnetic induction, power frequency high voltage can be obtained on the secondary (high voltage) winding. This power frequency high voltage can be rectified by high voltage silicon stack and filtered by capacitor to obtain DC high voltage, whose amplitude is 1.4 times the effective value of the power frequency high voltage. However, when using DC, the short-circuit rod should be pulled out; when using AC, insert the short-circuit rod.

2. Test Transformer with Taps:

In order to simultaneously satisfy the contradiction between high voltage and small current, and low voltage and large current, the high voltage winding is divided into two windings: one with larger current and the other with smaller current. Then the two windings are connected in series and led out separately, as shown in the schematic diagram.

3. Cascade Test Transformer:

Standards and Scope of Application:

JB/T9641－1999.    《Test Transformer Standard》
GB1094.1－1996.    《Power Transformer Part 1 General》
GB1094.2－1996.    《Power Transformer Part 2 Temperature Rise》
GB1094.2－1996.    《Power Transformer Part 3 Insulation Levels and Insulation Tests》
GB1094.2－1996.    《Power Transformer Part 5》
GB311.1－1997      《Insulation and Coordination of High Voltage Transmission and Transformation Equipment》
GB/T16927.1－1997  《High Voltage Test Techniques Part 1 General Test Requirements》
GB/T16927.1－1997  《High Voltage Test Techniques Part 2 Measuring Systems》
GB/7345－1987      《Partial Discharge Measurement》
GB2536－1990.      《Transformer Oil》
GB7252－1987.      《Guide to the Analysis and Judgment of Dissolved Gases in Transformer Oil》
GB7328－1987.      《Measurement of Sound Level of Transformers and Reactors》
JB8749－1998..      《General Technical Conditions for Voltage Regulators》
JB/T8169           《Coupling Capacitors and Capacitor Voltage Dividers》
JB/T563-1999       《Coupling Capacitors and Capacitors Ordering Technical Conditions》
DL/T848.3          《General Technical Conditions for High Voltage Test Devices》

Parameters:

◆ Input Current: 0 ～ 25A◆ Power Supply Voltage: AC220V ±10%,50Hz±1 Hz

◆ Meter Voltage: 0 ～ 100V (Other ranges can be customized)

◆ Output Voltage: 0 ～ 250V

◆ Output Current: 0 ～ 20A

◆ Voltage Measurement Accuracy: 0.5 %FS ±3 digits

◆ Current Measurement Accuracy: 0.5 %FS ±3 digits

◆ Timing Length: 0 ～ 9999 S (Special mode allows long-term operation)

◆ Operating Environment: Ambient temperature 0～50 ℃ Relative humidity ≤85 RH

Product Structure:

1. Its design concept, material selection, and process flow are all new. Therefore, it is not only small in size, light in weight, and beautiful in appearance, but also all technical indicators meet the requirements of the <<JB3570－９８>> standard.

Using high-quality cold-rolled DQ－151 oriented silicon steel sheets stacked into a multi-stage cylindrical frame-shaped iron core, and directly winding the high-voltage tower coil continuously with QZ type wire on a specially made high-strength insulating cylinder. The shell is of suitable shape and size, filled with SF6 gas inside.

2. The difference between products lies in the clever installation of the high-voltage rectifier silicon stack inside the high-voltage bushing. By inserting or pulling out the short-circuit rod, it can be switched between power frequency high voltage AC output or high voltage DC output.

3. The difference between products lies in the internal structure of the bushing