Unlock instant, AI-driven research and patent intelligence for your innovation.

Test method and device for evaluating the tendency of transformer oil and gas production in electric-heat mixing field

An electrothermal mixing field and transformer oil technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to realize vacuum oil injection, low electric field strength, and no comprehensive influence factors of electric field force on transformer oil.

Active Publication Date: 2016-10-12
PETROCHINA CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of this type of method is that the electric field strength it can withstand is low, and it cannot simulate the problem of transformer oil gas generation under high electric field strength in the transformer; second, because part of the high-voltage electric field is exposed above the transformer oil, the ionization position of the transformer oil is at the gas-liquid interface , this phenomenon is inconsistent with the actual working conditions of transformer oil. There is no gas-liquid interface in a power transformer under a high-voltage electric field. It affects the accurate measurement of the gas content in the oil, thus affecting the correct judgment of the electric field strength on the gas production trend in the oil
The other is to evaluate the gas production performance of transformer oil under low heat conditions, such as the ASTM D7150 method. This method simulates the gas production trend of transformer oil at 120°C and in a non-fault state, and simply examines the effect of temperature on transformer oil. The influence of characteristic gas trend is not combined with the comprehensive influence factors of electric field force on transformer oil gas generation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Test method and device for evaluating the tendency of transformer oil and gas production in electric-heat mixing field
  • Test method and device for evaluating the tendency of transformer oil and gas production in electric-heat mixing field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: as figure 1 , figure 2 As shown, the test device for evaluating the gas production trend of transformer oil under the electrothermal mixing field, the power control box 1 is connected to the high-voltage power supply 2, the high-voltage power supply 2 is connected to the high-voltage electrode connecting rod 12 of the electrode cup 4 through the protection resistor 3, and the low-voltage electrode of the electrode cup 4 is connected. The cylinder 14 is connected to the ground wire through the ground terminal 15, the high-pressure argon cylinder 6 is connected to the inlet valve 18 of the electrode cup 4 through a valve, and the oil inlet valve 17 of the electrode cup is connected to the degassing device 7 through the three-way valve F. The gas enters the gas chromatography analysis system 8 along with the carrier gas, the oil recovery device 9 is connected to the three-way valve F, the ground terminal 10 is connected to the shell of the high voltage power su...

Embodiment 2

[0021] Example 2: as figure 1 , figure 2 As shown in the figure, the test device for evaluating the gas production trend of transformer oil under the electrothermal mixing field includes a power control box 1, a high-voltage power supply 2, a protection resistor 3, an electrode cup 4, a constant temperature box 5, a high-voltage argon gas cylinder 6, a degassing device 7, a gas phase Chromatographic analysis system 8, oil recovery device 9, grounding terminal 10 and several valves. The power control box 1 controls the high-voltage power supply 2. The high-voltage power supply 2 is connected to the high-voltage electrode connecting rod 12 of the electrode cup 4 through the protection resistor 3. The low-voltage electrode cylinder 14 of the electrode cup is connected to the ground wire through the ground terminal 15. The high-voltage argon gas cylinder 6 The valve is connected to the inlet valve 18 of the electrode cup 4, and the oil inlet valve 17 of the electrode cup is conn...

Embodiment 3

[0023] Embodiment 3: a test method for evaluating the gas production trend of transformer oil under an electrothermal mixing field, specific implementation steps:

[0024] Step 1. First, clean, dry and assemble the components of the electrode cup 4 . Degas and dehydrate at least 300mL of No. 25 transformer oil sample, and use a 250mL syringe to seal the sample.

[0025] Step 2: For the assembled electrode cup 4, vacuumize and vacuum leak test through the air inlet valve 18 under the residual pressure of 10mmHg, connect the 250mL syringe with the sample to the oil inlet valve 17 of the electrode cup 4, In the vacuum state, the No. 25 transformer oil sample is sucked into the electrode cup 4. When the oil sample flows out of the vacuum pipeline, the injection is stopped, and the inlet valve 18 and the oil inlet valve 17 of the electrode cup 4 are closed. The electrode cup 4 is filled with oil.

[0026] Step 3. Place the oil-filled electrode cup 4 in the constant temperature tes...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a test method and device for evaluating gas production trend of transformer oil under an electric-heat mixed filed, and belongs to the technical field of transformer oil insulation performance evaluation. The method comprises the following steps: washing, drying, and assembling each part of an electrode cup; removing gas and water from transformer oil, sampling the transformer oil by a large-volume injector hermetically; butting the assembled electrode cup to an air inlet valve through a vacuum system, vacummizing the electrode cup, connecting the large-volume injector full of samples to the oil inlet valve of the electrode cup, filling the electrode cup by the samples until the whole electrode cup is filled with samples; placing the electrode cup in a thermostat, connecting the high-voltage electrode of the electrode cup to a high-voltage power supply through a protective resistor, connecting the low-voltage electrode of the electrode cup to a ground electrode through a grounding terminal; connecting a high-pressure argon gas bottle to the air inlet valve of the electrode cup through a valve; connecting the oil inlet / outlet to gas chromatography (GC) through an oil inlet valve, a three-way valve, and a degassing device; setting a voltage and power-on time on a high-voltage power supply control cabinet; setting temperature and running time on the thermostat, and starting the test.

Description

technical field [0001] The invention relates to a test method and device for evaluating the gas production trend of transformer oil in an electrothermal mixing field, and belongs to the technical field of transformer oil insulation performance evaluation. Background technique [0002] With the development of power transmission and transformation system towards high voltage, large capacity and low loss, 500kV, 750kV and 1000kV ultra-high voltage and ultra-high voltage and large-capacity transformers have been put into use one after another. higher requirements. The gas production of transformer oil refers to the phenomenon that when the transformer oil is subjected to strong electrical stress and thermal action during use, some characteristic gases will be produced and dissolved in the oil. As the most important power supply equipment in the power system, the reliability of the transformer is directly related to the safe operation of the power grid. The composition and cont...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/06G01N30/02
Inventor 于会民马书杰郭春梅张绮王会娟张培恒王鹏
Owner PETROCHINA CO LTD