Transformer Dissipation Factor Tan Delta Tester

The MOEORW- W4700C+ dielectric loss tester is a high-precision instrument for testing the dielectric loss tangent and capacitance of various high-voltage power equipment in power plants, substations, and other field or laboratory settings. The instrument features an integrated design, incorporating a dielectric loss test bridge, a variable frequency and voltage power supply, a step-up transformer, and SF6 high-stability standard capacitors. The high-voltage source is generated by the instrument's internal inverter and stepped up by the transformer before being used for testing the test object. The frequency can be varied to 45.0 Hz, 50.0 Hz , 55.0 Hz , 47.5Hz/52.5Hz , 45.0 Hz / 55.0 Hz , 60.0 Hz, 65.0 Hz, 57.5Hz/62.5Hz, 55.0 Hz/65.0 Hz . It employs digital notch filtering technology to avoid interference from the power frequency electric field, fundamentally solving the problem of accurate measurement under strong electric field interference. It is also suitable for testing applications powered by a generator after a complete power outage. This instrument can be used in conjunction with an insulating oil cup and a temperature control device to test the dielectric loss of insulating oil.

Extra Large LCD English Display
The instrument is equipped with a 7-inch large-screen touch-screen color display, featuring a super-large, fully touch-operated interface. Operation is simple and each process is clearly explained, requiring no additional professional training for operators. A single click completes the entire measurement process, making it an ideal intelligent dielectric loss measurement device.
 

Massive data storage
The instrument is equipped with a calendar chip and a large-capacity memory, which can store 100 sets of data. It can save the test results in chronological order, view the historical records at any time, and print them out.
 

Scientific and advanced data management
Instrument data can be exported via USB flash drive and viewed and managed on any PC.
 

Multiple test modes
The instrument can perform tests using various methods, including internal high voltage, external high voltage, internal standard, external standard, positive connection method, reverse connection method, and self-excitation method. Under the external standard, external high voltage, and positive connection method, it can measure high voltage (greater than 10kV) dielectric loss.
 

Measuring CVT without disconnecting high-voltage leads
The instrument can accurately measure the dielectric loss and capacitance values of a CVT without disconnecting the high-voltage leads.
 

C0 measurement using CVT reverse connection shielding method
The instrument can measure the dielectric loss and capacitance values of C0 at the upper end of the CVT using the reverse shielding method.
 

High-speed sampling signal
The inverter and sampling circuit inside the instrument are all digitally controlled, and the output voltage is continuously adjustable.
 

Multiple protections ensure safety and reliability.
The instrument is equipped with multiple protection measures, including protection against input voltage fluctuations, high-voltage current, output short circuits, power failures, overvoltage, overcurrent, and temperature fluctuations, ensuring its safety and reliability. It also features a grounding detection function to ensure that ungrounded equipment is not allowed to be operated or started for testing. An alarm function is also available to prevent damage to the instrument in case of accidental connection to a 380V power supply.
 

CVT testing completed in one step.
This instrument can also test the dielectric loss and capacitance of fully sealed CVT (capacitive voltage transformer) C1 and C2, enabling simultaneous testing of C1 and C2. It can also test the CVT turning ratio and voltage angle difference.
 

LCR Fully Automated Measurement
Fully automatic inductance, capacitance, and resistance measurement with angle display.
 

Supports Bluetooth data query
The instrument is equipped with a Bluetooth module, which supports Bluetooth data transmission and the protocol complies with the State Grid's "Technical Specifications for Data and Communication of Digital Testing Instruments for Electrical Equipment".

Inspection of main power equipment

• Power Transformer Dielectric Loss and Capacitance Testing
• Voltage/current transformer insulation loss detection
• Measurement of dielectric loss of high-voltage wall bushings and circuit breakers
   

CVT-specific test

• Capacitive voltage transformer C1/C2 / turns ratio / angle difference test
• Measuring CVT dielectric loss and capacitance without disconnecting leads
• CVT upper C0 reverse connection shielding method test
   

Field and laboratory testing

• High-interference environment testing at power plants and substations
• Laboratory high voltage equipment insulation performance testing
• Testing of equipment under generator power supply conditions during power outage
   

Insulation material testing

• Insulating oil dielectric loss and temperature control test
• Dielectric loss testing of high voltage capacitors and insulation products
   

Data-driven inspection operations

• Supports Bluetooth/USB flash drive data export
• Digital ledger and reporting management of power equipment