Transformer partial discharge system

UHV (W) -35KV transformer without partial discharge withstand voltage test device

1、 Meet the scope of the test sample

1. Test voltage less than 35kV

2. Configuration List

2、 Main components of the device

IIIMain functions and features

3.1Non partial discharge coupling capacitor

1 purpose

Non partial discharge coupling capacitor( hereinafter referred to as“ capacitor ”)use Measurement of partial discharge in high-voltage electrical equipment.

2 Meaning of Model

Main specifications and technical parameters

3. Environmental conditions for use

1 、The altitude of the usage area shall not exceed 1000m, The ambient air temperature range is -25+45℃。

2 、When using the productThe relative humidity of the surrounding air should not exceed 80%.

4. Main technical performance

1、 Capacitors at rated voltage UN Can run continuously below 1 Hour.

2、Deviation range of capacitor capacitance:-5+10%CN 。

3、 electricity Rong device between quality damage consume Jiao Zheng Cut value : in 20 ℃ N,0.9 Under 1.1 UN No greater than0.002.

4、 The short-term power frequency withstand voltage value of the capacitor is 1.1UN 。

5、 Capacitor at nominal value Partial discharge capacity at 100% voltage: ≤5PC

6、 Rated voltage100kV

7、 Nominal capacitance:800pF

8 、Measurement uncertainty:≤1%

9 、Power frequency withstand voltage level:100kV/1min

5. Main structure

1、 A capacitor consists of a casing, end cap, core, impregnating agent, and expansion pinComposed of a tensioner, base or support frame, and low-pressure seat.

2、 The shell is a vacuum impregnated epoxy sleeve

3、 The core is composed of several components connected in seriesThe components are made of all paper or paper film composite, and the core is genuineAfter air drying, immerse in excellent insulating oil.

4、 After impregnating the capacitor, a certain amount of oil pressure is applied, Caused by the expander's response to temperature changesCompensate for changes in oil volumeTo ensure that there is no negative pressure inside the capacitor at operating temperature.

Exterior diagram

1 Scope of application

Conduct partial discharge tests on dry-type transformers and other products using an intermediate frequency generator set, when the unit rotates at high speedWhen turning,The spark discharge generated between the carbon brush and the rotor will be tested in partial dischargeMore than on the road 10000pC ofBackground noise makes it impossible to conduct the experiment. This product is designed specifically for this type of testing circuit,Can effectivelyIsolate and attenuate spark discharge signals and various interference signals from the power supply side.

2 Electrical schematic diagram

3 Main technical parameters

1. Three phase;

2、 Rated frequency:100-200Hz；

3、 Rated input line voltage:800V，

4 、right 10kHz～300kHz The attenuation ability of interference signals is highYu 80dB。

5 、After connecting the product, the background partial discharge from the power side is less than3pC.

(Background noise from spatial coupling to partial discharge testing circuit should be eliminated)

4、 Product Features

1、 The primary and secondary coils of the isolation transformer are enclosed, The product has an electrostatic screen protector set in the middleGood isolation function.

2、 The inductor coil adopts an open circular iron core, which can ensure the inductance valueHas good linearity,It can also minimize its own iron loss to a certain extent.

3 、Reasonably select capacitance and inductance parameters to ensure that the product has sufficient attenuation factorsWhen the three-phase currents are basically symmetrical, the output voltage is also basically balanced.

5The transformer without partial discharge AC test meets the following indicators

1. Rated capacity: 30kVA;

2. Rated output voltage: 0-100kV;

3. Rated output current: 0-0.3A;

4. Rated input voltage: 0-400V;

5. Rated input current: 0-75A;

6 Instrument voltage:0～100V

7. Partial discharge capacity: less than rated voltage 3pc

four.UHV-2000A+Technical parameters of partial discharge detector

4.1Product execution standards

Ø GB/T16927--------- "High Voltage Test Techniques"

Ø IEC60270- Partial Discharge Measurement

Ø GB/T7354- Measurement of Partial Discharge

Ø GB1094------------- "Power Transformers"

Ø IEC6067.11- Dry type Transformers

Ø GB1207- Voltage Transformers

Ø GB1208- Current Transformers

Ø DL417 Guidelines for On site Measurement of Partial Discharge in Power Equipment

Ø GB12706.4 Test Requirements for Power Cable Accessories

Ø IEC60885-3- Partial Discharge Test for Whole Squeezed Cable

Ø GB/T3048.12--- "Test Methods for Electrical Properties of Wires and Cables - Partial Discharge Test"

Ø DL/T 846.4-2004- General Technical Conditions for High Voltage Testing Equipment Part 4: Partial Discharge Measuring Instruments

4.2Main technical indicators

4.3Product feature description

The partial discharge comprehensive analyzer is 4Channel, desktopTFTLCD display, reliable system, low failure rate. In addition to being used for partial discharge measurement of high-voltage electrical equipment (standard), it also has the function of accurately locating the fault point of faulty equipment (optional), and can also be used for online continuous monitoring of partial discharge of high-voltage electrical equipment such as large power transformers (optional). Truly achieving the integration of partial discharge measurement, positioning, and online monitoring functions. This local discharge device is a specialized instrument for measuring and analyzing the insulation performance of power equipment. This system adopts modern electronic and computer integrated technology to achieve signal amplification (analog, electronic, digital), filtering, data acquisition, data processing, graphic display, and automatic generation of test reports, thereby completing partial discharge measurement and fault diagnosis.

The scope of application, detection method, test circuit, technical performance parameters, etc. of this discharge device comply with international standardsIEC 60270-2000National standardsGB/T 7354-2003Partial Discharge MeasurementDL/T 417-2006The standard requirements of "Guidelines for On site Measurement of Partial Discharge in Power Equipment".

6、 Supply List

7、 Reference experimental standards