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GTU Non Partial Discharge High voltage test system

Suitable for test high voltage, big capacity GIS power equipment insulated withstand voltage test, partial discharge test and GIS transformer accuracy test

It can complete the partial discharge test under normal circumstances, the general background discharge test can debug less than 1Pc.
On the equipment installation of high voltage bushing, can withstand test conventional electric power equipment.

Product Description

GTU series non partial discharge high voltage test system is designed for power equipment factory and GIS substation, GIS power equipment manufacturer, basin type electrical insulator manufacturer. Suitable for test high voltage, big capacity GIS power equipment insulated withstand voltage test, partial discharge test and GIS transformer accuracy test.

GTU series non partial discharge high voltage test system integrate the high voltage boosting, high voltage measurement, high voltage transformer, high voltage coupling capacitors and all components in a sealed space.


1.The non partial discharge tester is small and available with minimal space

2.Components are light in weight

3. Rugged structure capable of handling long distance transportation

4. Direct connection with the subject

5. All high voltage parts are encapsulated in airtight space to ensure high safety of operators

6.Wide range applications, adding installation bushings can do normal withstand voltage testing.

7.Built in high voltage measurement and PD coupling capacitor

8.Built in high voltage isolating switch, which can separate interface of multiple test products, to ensure safety of high voltage test.



Voltage grade : 100kV, 200kV, 250kV, 300kV, 500kV, 750kV, 1000kV ;

Capacity : 50-2000kVA ;

High voltage generated mode: high voltage transformer voltage boost and series resonance(power frequency,frequency conversion);

All methods of boost voltage are one level voltage boost,no need to cascade boost voltage;

Input voltage: 0.35-10kV;

partial discharge capacity: Rated voltage 3pc (normal environment) ;

Impedance voltage: 5%;

Temperature rise: no more than 65k (50Hz) when rated current operates 60mins.



1. Are you manufacture ?

Yeah, we are manufacturer professional in design and produce high voltage test equipment with nearly 20 years experience .


2. When can I get the price ?

We usually quote within 6 hours after get your inquiry . If you are very urgent to get price, please feel free to contact us by Wechat&Whatsapp +86-13720145441 or send us by email, so that we will regard your inquiry priority .


3. Do you supply OEM?

 Of course, we supply OEM.


4. What about leading time for production ?

Honestly , it depends on order quantity and the product . Usually lead time is within 7 working days after deposit .


5. What is your terms of delivery ?

We accept EXW, FOB, CFR, CIF, DDU, etc . You can choose the one which the most convenient and cost effective for you .


6. What’s your payment terms :

TT payment, L/C at sight, Paypal, Western union, etc.


7. How much is the shipping cost and time ?

This is depend on the size and weight of your product, and the method of shipping ( by sea/ by ari/ by Express) and your designated port . Kindly afford us above information to check shipping cost and time for you .


8. What’s the warranty period ?

Our warranty period is one year free and lifelong maintenance .

If produce damage within one year ( not man-made damage ), we will send you spare parts for replacement .  After one year, maintenance is paid service .

9. What kind of Certificate you can provide ?

We can provide CE mark, ISO9001 quality certificate the third part Calibration Certificate (CNAS), factory test report .


10. Do you have Technical Backup to all customers from different countries ?

Surely, we have rich experience engineer to afford professional technical support and quick response to your technical questions .

We are manufacture with rich on site testing experience and understand how to deal with your problems . And our engineer can visit your company to afford technical support face to face if necessary .

Technical parameters:

1.GTU high voltage PD test transformer

GTU high-voltage partial discharge testing transformer is the key of the test system, it is placed in an insulated container designed specifically for SF6 in the high voltage side isolated from other loop through high pressure disc insulator, low voltage terminal all placed in the junction box.

The low voltage side of transformer winding and an excitation winding and measuring winding (measuring winding only for system testing), for large capacity transformer (500kVA) compensation compensation winding independent, to better play the test pressure and load flexibility, improve the efficiency of compensation.

The transformer tank is equipped with an inflatable / vacuum quick joint, a pressure monitoring meter, an over pressure release valve and a temperature and pressure sensor for the operation of the console to carry out remote monitoring.





PD under rated voltPc

Short circuit resistance



Temp rising (60mins at rated current)





















≤50K(Power frequency)
















2. ZST voltage regulator

The voltage regulator adopts an air insulated column voltage regulator, and a smooth voltage output can be obtained. The component is isolated from the power supply, and the transformer and the compensating reactor are arranged in the same frame to facilitate transportation. The input and output of the regulator are equipped with air circuit breaker which is isolated from the power supply of the system, and the drive motor allows slow and fast voltage regulation. Zero start chain enables step-up operation to be guaranteed step by step from zero pressure.

































3.GLB power isolation transformer

The main function of the power isolation transformer is to reduce the interference from the main power line, so as to ensure that the background of the partial discharge measurement is below 1Pc.

Capacity matching with voltage regulator.

4.High voltage measurement

High voltage measurement signal from the installation of built-in system pipeline divider, with peak voltage meter can display the peak voltage of 2 V / and effective value.

-Measuring accuracy + 1% measurement value (10%--100% rated voltage)

-Measuring ratio 10000:1

-Rated voltage: matching maximum voltage of system

-Rated capacitance 50pF

-Partial discharge  ≤1.5pc

 5.Coupling capacitor

The coupling capacitor is mounted on a specially designed SF6 insulated tank, high voltage electrode disk insulator is connected with the high voltage end through the main system. Since the capacitor is mounted in a fully enclosed metal tank, it is free from any other stray capacitance and ensures high sensitivity to partial discharge measurements. The low voltage electrode of the coupling capacitor is directly drawn to the terminal seat of the tank through the shielding lead wire, and is connected with the measuring impedance.

-Rated voltage matches the maximum voltage of the system

-Rated capacitance: 100pF

-Partial discharge quantity ≤1.5pc

 6.BCL compensation reactor

The compensation reactor is used to compensate the capacitive current of the tested product. The reactor consists of two coils, and through the tap of the coil, a combination of a plurality of compensating powers can be formed. The combination can be switched by hand, and the remote operation can be realized on the operation console

Technical parameters of compensation reactor (partial model)







































7. GTU operation control system

The operation control system provides safe and convenient computer operation for AC high voltage test.


- High voltage test system shown on the big screen can be easy and intuitive operation

- Main circuit breaker on/off

- on/off operation (high voltage contactor start / stop)

- Automatic zero start

- Preset speed boost (up to 3 speed)

- Preset pressure value required

- Preset time pressure (withsand time after finishing automatic up/down voltage.

- Compensation reactor on/off

- High voltage isolation switch on/off interface


- First input current and voltage display

- Transformer input current and voltage display

- High voltage display

- Withsand test time display

- Testing system SF6 gas chamber pressure display

- Transformer chamber temperature display SF6


- Preset value of over voltage protection

- Preset value of overcurrent protection

- Gas chamber pressure / temperature automatic protection

- Lock other operation - Boost

 8.Universal adjustable butt joint platform

The platform is specially designed for the GIS switch test system, which can be easily connected with the GIS system flange.

Adjustable range

-Vertical adjustment: ±200mm

-Level adjustment (X): ±100mm

-Level adjustment (Y): ± 100mm

-Angle adjustment :   ±5º

(Remark: this is one of the specifications we showed on the website,for more specifications, please feel free to contact us.)

Test system composition

Basic system components

1.Column voltage regulator (GIS voltage transformer system adopts frequency conversion power supply module)

2.GLB power isolating transformer

3.BCL compensating reactor

4.GTU PD test transformer

5.High voltage divider (capacitor type)

6.A basic test interface

7.Digital operation console

8.Coupling capacitor


Factory test and shippment

We will do factory test for every product before devilering, to ensure qualified of the product.

We will pack the product carefully and choose suitbale shippment for client,to ensure the safe arrival.

Installation and commissioning

we provide installation and commissioning assistance to get you up and running. Domestically within China or internationally, we will be there to support you. During the installation, integration and operation of a new test system, a variety of special services are involved. If it ’ s necessary, we can offer oversea commissioning service for our clients.

Service and support

In any fault case of our product, we will arrange engineer to deal with your problem within 24hours

Service guarantee

Contact purchase

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