Transformer Tester

A: 1. Frequency conversion anti-interference
Using frequency conversion anti-interference technology, it can still measure accurately under 200% interference, and the test data is stable, which is suitable for anti-interference dielectric loss test in the field.
2. High-precision measurement
Using the technology of frequency fluctuation, digital waveform analysis and bridge self-calibration, the high-precision dielectric loss measurement can be achieved by combining with the high-precision three-terminal standard capacitor, and the accuracy and stability of forward/reverse connection measurement are consistent.
All range input resistance is lower than 2 Ω instrument, which eliminates the influence of additional capacitance test line.
Can be externally connected to oil cup for precision insulation oil dielectric loss test, can be externally connected to solid material measurement electrode for precision insulation material dielectric loss test.
3. Good compatibility
Automatic identification of 50Hz / 60Hz system power supply, support generator power supply, even if the frequency fluctuation is large, it can be measured normally.
The built-in series and parallel dielectric loss measurement models are fully compatible with the calibration platform and dielectric loss standard, so as to facilitate instrument verification.
4. Multi-stage safety protection to ensure the safety of person and equipment
High voltage protection: short circuit, breakdown or high voltage current fluctuation, can cut off the output by short circuit.
Low voltage protection: misconnected 380V, power fluctuation or sudden power failure, start protection, it will not cause overvoltage.
Grounding protection: when the instrument is not grounded properly and the enclosure has dangerous voltage, start the grounding protection.
C V T: high voltage and current, low voltage and current four protection limits, will not damage the equipment; Incorrect menu will not output excitation voltage. No 10kV high voltage output when CVT is measured.
Anti-misoperation: two-stage power switch; Real-time voltage and current monitoring; Multiple button confirmation; Clear high/low voltage terminals; Slow speed boost, can quickly reduce the pressure, sound and light alarm.
Anti "capacitance rise" : the voltage rise effect occurs when measuring large volume test products. The instrument can automatically track the output voltage and keep the test voltage constant.
Seismic performance: the instrument adopts unique seismic design, which can withstand strong long-distance transportation vibration and turbulence without damage.
High voltage cable: it is high voltage resistant insulated conductor, which can be towed.
5. Technological breakthrough, powerful function
(1) With forward/reverse connection, internal/external standard capacitor, internal/external high voltage, multiple working modes and integrated structure, it can do all kinds of conventional dielectric loss test and insulation resistance measurement without any external auxiliary equipment.
(2) It has external standard capacitor interface, which can automatically track the frequency of external test power supply from 40Hz to 70Hz, supports power frequency power supply and series resonant power supply to conduct large-capacity and high-voltage dielectric loss test.
(3) It has the function of reminding the circuit of bad contact discharge, so as to determine whether the connection is reliable or not.
(4) With CVT self-excitation measurement function, C1/C2 can be measured at the same time by wiring, and automatically compensate for the influence of bus grounding and voltage division of standard capacitor. There is no need to change the wire and connect any accessories externally, and the high-voltage connection line can drag the ground.
(5) With the function of CVT variable ratio, CVT variable ratio, polarity and phase error can be measured.(optional)
(6) It has anti-wiring low-voltage shielding function. Under the condition of 220kV CVT bus grounding, 12kV anti-wiring dielectric loss measurement can be carried out on C11 without disconnecting the wires, and the main and subordinate capacitors can be measured at the same time with one connection.
(7) English text and text menu, large-screen backlight LCD display.
(8) Equipped with thermal printer, the printing data is clear, fast and noiseless.
(9) With calendar clock, can store 100 sets of measurement data.
(10) With computer interface. Through this interface, measurement, data processing and report output can be achieved, and internal measurement software can be upgraded. A computer can control 32 instruments, which can be integrated into the comprehensive high-voltage test vehicle.
(11) With the function of four-channel forward connection, the transformer bushing can measure three bushing of A/B/C at one time, saving time and effort (function optional)

A: Preparation and wiring:
1. Disconnect the high-voltage and low-voltage sides of the transformer, and disconnect the grounded winding.
2. Adjust the transformer tap changer to position 1
3. According to the instrument label, connect the yellow, green, and red high-voltage test lines to A. on the high-voltage side of the transformer B. C;
Connect the low-voltage test line yellow, green, and red to the low-voltage side a, b, and c of the transformer
(Please note that the high and low voltage measurements should not be reversed as it may burn out the instrument fuse or directly damage the instrument.)
Equipment; Please follow ABC three-phase for wiring. If there are any problems during testing, it will be easier to determine the faulty winding
Operation:
1. Connect the AC220V power supply and turn on the instrument power switch.
2. Press the button on the instrument panel to activate the transformer
Nameplate settings, wiring methods, and standard variations
Ratio (voltage regulation ratio). (Normally, according to regulations, all components of the transformer need to be tested.)
We need to follow the nameplate for the gear ratio under the gear shift
Require setting of voltage regulation ratio. If only one gear is measured or
Transformers without gears, with a voltage regulation ratio set to 0.00%)
3. Keep the settings and start data measurement. Instrument output
Current result: Transformer group, transformer ratio and error

A: Sweep Frequency Response Analyzer based on the measurement of the windings characteristic parameters inside the transformer, the tester using the world's developed countries sound internal fault frequency response analysis (FRA) method, able to make an accurate internal transformer fault judgment.
After the completion of the design and manufacture transformers, coils and its internal structure to be finalized, therefore a transformer coil winding, if the voltage level, method of winding are the same, each coil corresponding parameters (Ci, Li) is determined. Thus the frequency domain response characteristics of each coil also will determine, among the corresponding three-phase coil has a comparable frequency spectrum.  
It occurs inter-turn, phase short circuit during the test or collision during transport, causing the coil relative displacement, and during operation under short circuit and fault conditions due to the tension caused by the electromagnetic, coil is deformed, it will make the distribution parameters of the transformer windings changes. Thus influent and change the existing frequency domain transformer frequency response feature, that frequency response amplitude changes occur and resonance frequency shift, etc.

A: Transformer On-Load Tap-Changer Tester mainly used for measurement of transition waveform, transition time, various instantaneous transition resistances and three-phase synchronism etc. of the transformer OLTC.
Characterized by high intelligence, whole-process prompt from English menu, simple operation, small volume, light weight, strong anti-interference capability, this kind of instrument can greatly relieve labor intensity for on-site workers and is an ideal product for assuring production safety and improving product quality in the transformer manufacturing industry for power generation & supply enterprises.