CN115236233A - System and method for detecting gas solubility, voltage resistance and partial discharge gas of transformer - Google Patents
System and method for detecting gas solubility, voltage resistance and partial discharge gas of transformer Download PDFInfo
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- CN115236233A CN115236233A CN202210874876.3A CN202210874876A CN115236233A CN 115236233 A CN115236233 A CN 115236233A CN 202210874876 A CN202210874876 A CN 202210874876A CN 115236233 A CN115236233 A CN 115236233A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 107
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 75
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052802 copper Inorganic materials 0.000 claims abstract description 28
- 239000010949 copper Substances 0.000 claims abstract description 28
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 28
- 238000002360 preparation method Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000004090 dissolution Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 239000003292 glue Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
Abstract
The invention relates to a system and a method for detecting gas solubility, pressure resistance and partial discharge gas production of a transformer, wherein the system comprises an oil tank, the lower part of the oil tank is connected with an oil inlet, the bottom of the oil tank is connected with an oil return port, the upper part of the oil tank is connected with a nitrogen gas bottle, the top of the oil tank is connected with a vacuum pump, an air pump is connected between the top and the bottom of the oil tank, the air pump and the bottom of the oil tank are respectively connected with an air guide pipe, one air guide pipe is inserted into a cup cover of an oil cup, the other air guide pipe is inserted into the cup bottom of the oil cup, the oil cup is arranged on an insulating oil pressure resistance instrument, copper bars are arranged on two sides of the cup wall of the oil cup, and the copper bars are connected with a partial discharge tester. The invention can complete the measurement of the solubility of nitrogen in oil at different temperatures and pressures, simultaneously detect the power frequency withstand voltage of gas-containing oil and the partial discharge of the electrode of the oil cup, provide test data for the oil level calculation and the gas-containing oil insulation performance of the explosion-proof transformer, and provide technical support for the popularization and application of the nitrogen-filled sealed explosion-proof transformer.
Description
Technical Field
The invention belongs to the technical field of transformer oil sample detection, and particularly relates to a system and a method for detecting gas solubility, voltage resistance and partial discharge gas of a transformer.
Background
The nitrogen-filled sealed type explosion-proof transformer has the characteristic that the action of an internal fault pressure release valve has the characteristic of no oil injection during gas injection, the top layer of oil is a nitrogen layer with certain pressure, the transformer operates in a load switching mode under different environmental temperatures, the nitrogen temperature and the nitrogen pressure change and the solubility of the nitrogen in the oil change, the insulating oil dissolves or separates out the nitrogen, and the breakdown voltage level of the oil possibly changes.
Disclosure of Invention
The invention aims to provide a system and a method for detecting gas solubility, voltage resistance and partial discharge gas of a transformer, which are used for detecting nitrogen solubility, breakdown voltage of gas-containing insulating oil and partial discharge level of an oil cup electrode.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a gas solubility, voltage resistance and partial discharge gas detection system for a transformer, which comprises a PLC control system, an oil sample preparation unit and an insulation detection unit;
the oil sample preparation unit is used for preparing a nitrogen-containing gas oil sample with balanced dissolution;
the insulation detection unit is used for carrying out gas-containing oil working frequency voltage withstanding detection and gas-containing oil middle electrode partial discharge detection;
the PLC control system is used for driving the oil sample preparation unit to perform oil injection, vacuum pumping, heating and nitrogen filling, so that the oil sample preparation unit achieves the dissolution balance of different temperatures and pressures, and is used for calculating the solubility of nitrogen;
the oil sample preparation unit comprises: the lower part of the oil tank is provided with an oil inlet, and the bottom of the oil tank is provided with an oil return port; the upper part of the oil tank is connected with a nitrogen cylinder, and the top of the oil tank is connected with a vacuum pump; the oil tank is divided into a lower oil chamber and an upper nitrogen layer; a heating rod and a temperature measuring resistor are arranged in the oil tank; the oil sample preparation unit is electrically connected with the PLC control system;
the insulation detection unit comprises an oil cup, and the oil cup is connected with the air pump and the oil tank through an air duct to form a serial loop; the oil cup is arranged on the insulating oil pressure-resistant instrument; copper bars are inserted into two sides of the wall of the oil cup, the end parts of the two copper bars in the oil cup are used as electrodes, and the other end parts are arranged outside the oil cup; the copper bar is connected with two ends of a capacitive voltage divider, and the capacitive voltage divider is connected with the partial discharge tester.
Further, an air pump is connected between the top and the bottom of the oil tank.
Further, the vacuum pump is connected with the injector through an injection valve;
a pressure stabilizing valve is connected between the nitrogen cylinder and the oil tank;
an oil inlet valve is connected between the oil inlet and the oil tank;
an oil pump is connected between the oil return port and the oil tank;
an oil return valve is connected between the oil pump and the oil tank;
a vacuum pump valve is connected between the vacuum pump and the oil tank;
the pressure stabilizing valve, the oil inlet valve, the oil pump, the oil return valve, the vacuum pump, the injection valve, the vacuum pump valve and the air pump are respectively connected with the PLC through control cables;
the heating rod and the temperature measuring resistor are respectively connected with the PLC.
Furthermore, all valves are electric valves, and all pipelines are metal pipelines; the metal pipeline and the gas guide tube are sealed by a metal joint.
Further, the air pump and the bottom of the oil tank are respectively connected with an air duct; the air guide pipe at the bottom of the air pump is inserted into the bottom of the oil cup, and the air guide pipe at the bottom of the oil cup is inserted into the cup cover of the oil cup.
Further, the cup cover of the oil cup is made of resin glass; the cup cover of the oil cup is adhered to the oil cup through the AB glue;
the copper bar and the side wall of the oil cup are sealed through AB glue;
the air duct is sealed by AB glue and led out of the cup cover;
the oil cup is arranged on the insulating oil pressure resistance instrument through a sheath.
Furthermore, the oil tank is made of stainless steel and is internally provided with an oil level switch.
Further, a sheath is arranged outside the copper rod outside the oil cup;
the top end of the sheath is provided with a hole, a cable penetrates through the hole to be connected with the end part of the copper rod outside the oil cup, and the other end of the cable is connected with the end part of the copper rod
The capacitive voltage divider.
Further, the capacitive voltage divider adopts a 170kV capacitive bushing test platform or a 100kV capacitive tower.
Furthermore, the capacitive voltage divider end screen series impedance is connected with a partial discharge tester.
Further, the cable connected with the copper rod is led out from the ground insulating support by 2400 mm.
Furthermore, the PLC controller is connected with a monitoring microcomputer, and the monitoring microcomputer is connected with a display.
The invention also provides a method for detecting the gas solubility, the voltage resistance and the partial discharge gas of the transformer, which comprises the following steps:
driving an oil sample preparation unit through a PLC control system in the detection system for gas solubility, pressure resistance and partial discharge gas of the transformer, starting a control program, controlling an oil inlet valve to inject oil, controlling a pressure stabilizing valve to perform pressure stabilization nitrogen gas filling, controlling a heating rod to perform constant temperature oil heating, controlling an air pump to bubble to accelerate dissolution balance, and controlling a vacuum pump to perform vacuum pumping to perform oil-gas separation;
preparing a nitrogen-containing gas oil sample with dissolution balance at different temperatures and pressures at fixed intervals;
controlling a dissolved and balanced nitrogen-containing gas oil sample prepared by sampling an oil pump through a PLC control system, detecting the gas content on a gas chromatograph, and calculating the solubility of nitrogen in oil in an oil tank;
the gas-containing oil is introduced into the oil cup through the gas guide tube, the electrode partial discharge waveform and the partial discharge quantity of the gas-containing oil cup are detected through the partial discharge tester, and the power frequency withstand voltage of the gas-containing oil is monitored through the insulating oil withstand voltage tester.
Further, the preparation of the nitrogen-containing gas oil sample with balanced dissolution is carried out every 30 min.
Furthermore, the temperature range for preparing the nitrogen-containing gas oil sample is within 30-70 ℃, and the air pressure is within 70-130 kPa.
Further, the PLC control system records a control program in advance.
The beneficial effects of the invention are:
the invention can complete the measurement of the solubility of nitrogen in oil at different temperatures and pressures, simultaneously detect the power frequency withstand voltage of gas-containing oil and the partial discharge of the electrode of the oil cup, provide test data for the oil level calculation and the gas-containing oil insulation performance of the explosion-proof transformer, and provide technical support for the popularization and application of the nitrogen-filled sealed explosion-proof transformer.
Drawings
Fig. 1 is a schematic structural diagram of a gas solubility, withstand voltage, and partial discharge gas detection system of a transformer according to an embodiment of the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment provides a gas solubility, voltage resistance and partial discharge gas detection system for a transformer, which is shown in fig. 1 and comprises a PLC control system, an oil sample preparation unit and an insulation detection unit.
The oil sample preparation unit is used for preparing a nitrogen-containing gas oil sample with balanced dissolution.
The insulation detection unit is used for carrying out gas-containing oil working frequency voltage withstanding detection and gas-containing oil middle electrode partial discharge detection.
The PLC control system is used for driving the oil sample preparation unit to perform oil injection, vacuum pumping, heating and nitrogen filling, so that the dissolution balance of different temperatures and pressures is realized, and the PLC control system is used for calculating the solubility of nitrogen.
The oil sample preparation unit comprises: the oil tank 1 is characterized in that the lower part of the oil tank 1 is connected with an oil inlet 2, the bottom of the oil tank 1 is connected with an oil return port 3, the upper part of the oil tank 1 is connected with a nitrogen bottle 4, and the top of the oil tank 1 is connected with a vacuum pump 5; an air pump 6 is connected between the top and the bottom of the oil tank 1.
The oil tank 1 is internally provided with a heating rod 13 and a temperature measuring resistor 14.
The vacuum pump 5 is connected to an injector 16 via an injection valve 15.
A pressure stabilizing valve 17 is connected between the nitrogen cylinder 4 and the oil tank 1, an oil inlet valve 18 is connected between the oil inlet 2 and the oil tank 1, an oil pump 19 is connected between the oil return port 3 and the oil tank 1, an oil return valve 20 is connected between the oil pump 19 and the oil tank 1, and a vacuum pump valve 21 is connected between the vacuum pump 5 and the oil tank 1.
The pressure stabilizing valve 17, the oil inlet valve 18, the oil pump 19, the oil return valve 20, the vacuum pump 5, the injection valve 15, the vacuum pump valve 21 and the air pump 6 are respectively connected with a PLC (programmable logic controller) 23 through control cables 22.
The heating rod 13 and the temperature measuring resistor 14 are respectively connected with the PLC 23.
The insulation detection unit comprises an oil cup 8, the air pump 6 and the bottom of the oil tank 1 are respectively connected with an air duct 7, and the two air ducts are all inserted into the oil cup, so that the oil tank, the air pump and the air ducts form a series loop.
Specifically, the air duct at the bottom of the air pump is inserted into the bottom of the oil cup 8, and the air duct at the bottom of the oil tank 1 is inserted into the cup cover of the oil cup 8. The air pump 6 sucks air to flow from the bottom of the oil cup to the cup cover and then flows upwards from the bottom of the oil cup, bubbles in the oil cup flow to exchange air, and the air is accelerated to be dissolved in the oil in a balanced mode.
The oil cup 8 is arranged on an insulating oil pressure-resistant instrument 9, copper bars 10 are arranged on two sides of the cup wall of the oil cup 8 and serve as electrodes, and the electrode distance of the standard oil cup is 2.5mm. Specifically, the copper bars are inserted into the oil cup from two sides of the wall of the oil cup, one ends of the two copper bars are used as electrodes, the distance is 2.5mm, the other ends of the two copper bars are arranged outside the oil cup, and a sheath is arranged outside the copper bars outside the oil cup. The insulating oil pressure resistance instrument 9 is used for detecting the power frequency pressure resistance of the gas-containing oil.
Holes are formed in the top ends of the sheaths on the two sides of the oil cup 8, and a cable is penetrated to connect with a copper bar 10 outside the oil cup; if no hole is formed, the cable welding copper rod 10 is led out along the opening of the sheath. The ends of the two copper bars 10 are connected with two ends of a capacitive voltage divider 12 through cables, and the capacitive voltage divider 12 is connected with the partial discharge tester 11.
The PLC controller 23 is connected with a monitoring microcomputer 24, and the monitoring microcomputer 24 is connected with a display 25.
The system for detecting the gas solubility, the withstand voltage and the partial discharge gas of the transformer comprises a PLC control system, an oil sample preparation unit and an insulation detection unit, and can detect the nitrogen solubility, the breakdown voltage of gas-containing insulating oil and the partial discharge level of an oil cup electrode.
In the embodiment, the oil tank is divided into a lower-layer oil chamber and an upper-layer nitrogen layer; the nitrogen layer is connected with a pressure stabilizing valve 17 of the nitrogen cylinder 4, the vacuum pump 5 and an air inlet pipe of the air pump 6, and the switch side of the pressure stabilizing valve 17 is connected with the nitrogen cylinder 4; the oil chamber is connected with an oil inlet valve 18, an oil pump 19 and an air outlet pipe of the air pump 6; the pipeline from the oil pump 19 to the oil tank 1 is provided with an oil return valve 20, and pipelines on two sides of the vacuum pump 5 are provided with an injection valve 15 and a vacuum pump valve 21.
In this embodiment, a control program for driving the oil sample preparation unit is preset in the PLC control system.
In the embodiment, the PLC control system is adopted to control the preparation of oil samples with different oil temperatures and air pressures, the operation is convenient, and the detection of the gas solubility in oil under the specified temperature and pressure conditions can be completed; the vacuum pump 5 is connected with the oil tank 1 through an electric valve, so that oil-gas separation is realized; the pressure stabilizing valve 17 is connected with the nitrogen cylinder 4 and the oil tank 1, so that constant-pressure inflation with adjustable pressure is realized; the air pump 6 is connected with the upper nitrogen and the lower oil of the oil tank 1, so that the gas is quickly dissolved in the oil, and the dissolving and balancing time of the gas and the oil is shortened; a heating rod 13 and a temperature measuring resistor 14 are arranged in the oil tank 1, and the temperature-adjustable constant-temperature oil heating is realized through control; the oil pump 19 is connected with the oil tank 1 through an electric valve, so that negative air pressure oil sampling is realized;
the oil cup 8 is sealed and connected with the air pump 6 and the oil tank 1, and gas-containing oil in the metal oil tank 1 is introduced into the insulating oil cup 8, so that the working frequency and voltage withstand detection conditions of the gas-containing oil are met;
the oil cup 8 is led out in an insulating mode to the ground through a leading cable, is connected with a partial discharge tester 11 through a capacitive voltage divider 12, and has a partial discharge detection condition for electrodes in gas-containing oil.
In a preferred embodiment, the oil tank 1 is made of stainless steel and has an oil level switch built therein.
In a preferred embodiment, all valves are electrically operated valves and all pipes are metal-sealed pipes. The metal pipeline and the gas guide pipe are sealed by a metal joint.
In a preferred embodiment, the capacitive voltage divider 12 employs a 170kV capacitive bushing test platform or a 100kV capacitive tower.
In a preferred embodiment, the capacitive divider end screen series impedance is connected to the partial discharge tester 11.
In a preferred embodiment, the copper bar 10 is sealed with the side wall of the oil cup by AB glue.
In a preferred embodiment, the oil cup cover is made of resin glass.
As a preferred embodiment, the air duct 7 is inserted into the cup cover and the cup bottom, sealed by AB glue and led out of the cup cover; the cup cover is glued to the oil cup 8 through the glue AB.
As a preferred embodiment, the oil cup 8 is mounted to the oil pressure resistance instrument 9 through a sheath.
In a preferred embodiment, considering that the voltage of a lead wire to earth is 70-80 kV and the creepage distance is 31kV/mm in an oil power frequency test, a cable connected with a copper rod is led out from the ground insulation support by 2400 mm.
Example 2
The embodiment provides a method for detecting gas solubility, withstand voltage and partial discharge gas of a transformer, which comprises the following steps:
the oil sample preparation unit is driven by a PLC control system, a control program is started, and the oil injection, the vacuum pumping, the stable and constant temperature heating, the stable and constant air pressure nitrogen filling and bubbling are controlled by a button, so that the accelerated dissolution balance is realized;
the nitrogen-containing gas oil sample preparation with dissolution balance at different temperatures and pressures is carried out at fixed intervals.
Sampling the prepared oil sample containing the dissolved balanced nitrogen gas, detecting the gas content on a gas chromatograph, and calculating the solubility of the nitrogen gas in the oil tank 1; meanwhile, the electrode partial discharge waveform and partial discharge quantity of the oil cup 8 containing the gas oil are detected through a partial discharge tester, and the power frequency withstand voltage of the gas oil is monitored through an insulating oil withstand voltage tester.
In the embodiment, a program is programmed and input into the PLC control system in advance according to the functional requirements of oil injection, vacuum pumping, steady heating, steady inflation, bubbling and the like.
As a preferred embodiment, the preparation of the nitrogen-containing gas oil sample with the dissolution equilibrium is carried out every 30 min.
In a preferred embodiment, the nitrogen-containing gas oil sample is prepared at a temperature within a range of 30 to 70 ℃ and a gas pressure within a range of 70 to 130 kPa.
As a preferred embodiment, 40mL of sample is taken at a time.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (16)
1. A gas solubility, withstand voltage and partial discharge gas detection system of a transformer is characterized by comprising a PLC control system, an oil sample preparation unit and an insulation detection unit;
the oil sample preparation unit is used for preparing a nitrogen-containing gas oil sample with balanced dissolution;
the insulation detection unit is used for carrying out gas-containing oil working frequency voltage withstanding detection and gas-containing oil middle electrode partial discharge detection;
the PLC control system is used for driving the oil sample preparation unit to perform oil injection, vacuum pumping, heating and nitrogen filling, so that the oil sample preparation unit achieves the dissolution balance of different temperatures and pressures, and is used for calculating the solubility of nitrogen;
the oil sample preparation unit comprises: the lower part of the oil tank is provided with an oil inlet, and the bottom of the oil tank is provided with an oil return port; the upper part of the oil tank is connected with a nitrogen cylinder, and the top of the oil tank is connected with a vacuum pump; the oil tank is divided into a lower oil chamber and an upper nitrogen layer; a heating rod and a temperature measuring resistor are arranged in the oil tank; the oil sample preparation unit is electrically connected with the PLC control system;
the insulation detection unit comprises an oil cup, and the oil cup is connected with the air pump and the oil tank through an air duct to form a serial loop; the oil cup is arranged on the insulating oil pressure-resistant instrument; copper bars are inserted into two sides of the wall of the oil cup, the end parts of the two copper bars in the oil cup are used as electrodes, and the other end parts are arranged outside the oil cup; the copper bar is connected with two ends of a capacitive voltage divider, and the capacitive voltage divider is connected with the partial discharge tester.
2. The transformer gas solubility, withstand voltage and partial discharge gas detection system according to claim 1, wherein an air pump is connected between the top and the bottom of the oil tank.
3. The system for detecting gas solubility, withstand voltage and partial discharge of transformer according to claim 1,
the vacuum pump is connected with the injector through an injection valve;
a pressure stabilizing valve is connected between the nitrogen cylinder and the oil tank;
an oil inlet valve is connected between the oil inlet and the oil tank;
an oil pump is connected between the oil return port and the oil tank;
an oil return valve is connected between the oil pump and the oil tank;
a vacuum pump valve is connected between the vacuum pump and the oil tank;
the pressure stabilizing valve, the oil inlet valve, the oil pump, the oil return valve, the vacuum pump, the injection valve, the vacuum pump valve and the air pump are respectively connected with the PLC through control cables;
the heating rod and the temperature measuring resistor are respectively connected with the PLC.
4. The system for detecting gas solubility, pressure resistance and partial discharge of a transformer according to claim 3, wherein all valves are electrically operated valves, and all pipelines are metal pipelines; the metal pipeline and the gas guide pipe are sealed by a metal joint.
5. The system for detecting the gas solubility, the pressure resistance and the partial discharge gas of the transformer according to claim 1, wherein the gas pump and the bottom of the oil tank are respectively connected with a gas guide pipe; the air guide pipe at the bottom of the air pump is inserted into the bottom of the oil cup, and the air guide pipe at the bottom of the oil tank is inserted into the cup cover of the oil cup.
6. The system for detecting gas solubility, pressure resistance and partial discharge gas of a transformer according to claim 5, wherein the cover of the oil cup is made of resin glass; the cup cover of the oil cup is adhered to the oil cup through the AB glue;
the copper bar and the side wall of the oil cup are sealed through AB glue;
the air duct is sealed by AB glue and led out of the cup cover;
the oil cup is arranged on the insulating oil pressure resistance instrument through a sheath.
7. The system according to claim 1, wherein the oil tank is made of stainless steel and is provided with an oil level switch inside.
8. The system for detecting the gas solubility, the pressure resistance and the partial discharge gas of the transformer according to claim 1, wherein a sheath is arranged outside the copper rod outside the oil cup;
the top end of the sheath is provided with a hole, a cable penetrates through the hole to be connected with the end part of the copper rod outside the oil cup, and the other end of the cable is connected with the end part of the copper rod
The capacitive voltage divider.
9. The transformer gas solubility, withstand voltage and partial discharge gas detection system of claim 1, wherein the capacitive voltage divider employs a 170kV capacitive bushing test platform or a 100kV capacitive tower.
10. The system according to claim 9, wherein the capacitive voltage divider end shield series impedance is connected to a partial discharge tester.
11. The system according to claim 8, wherein the cable connected to the copper rod is led out from the ground insulating support by 2400 mm.
12. The system for detecting gas solubility, withstand voltage and partial discharge gas of a transformer according to claim 1, wherein the PLC controller is connected with a monitoring microcomputer, and the monitoring microcomputer is connected with a display.
13. A method for detecting gas solubility, withstand voltage and partial discharge gas of a transformer is characterized by comprising the following steps:
the method comprises the steps of driving an oil sample preparation unit through a PLC control system in the transformer gas solubility, pressure resistance and partial discharge gas detection system according to any one of claims 1 to 12, starting a control program, controlling an oil inlet valve to inject oil, controlling a pressure stabilizing valve to perform pressure stabilization nitrogen gas filling, controlling a heating rod to perform constant temperature oil heating, controlling an air pump to bubble to accelerate dissolution balance, and controlling a vacuum pump to perform vacuum pumping for oil-gas separation;
preparing a nitrogen-containing gas oil sample with dissolution balance at different temperatures and pressures at fixed intervals;
controlling a dissolved and balanced nitrogen-containing gas oil sample prepared by sampling an oil pump through a PLC control system, detecting the gas content on a gas chromatograph, and calculating the solubility of nitrogen in oil in an oil tank;
the method comprises the steps of introducing the gas-containing oil into an oil cup through a gas guide tube, detecting electrode partial discharge waveforms and partial discharge quantity of the gas-containing oil cup through a partial discharge tester, and monitoring power frequency withstand voltage of the gas-containing oil through an insulating oil withstand voltage tester.
14. The method for detecting the gas solubility, the pressure resistance and the partial discharge gas of the transformer according to claim 13, wherein the preparation of the nitrogen-containing gas oil sample with balanced dissolution is performed every 30 min.
15. The method for detecting the gas solubility, the withstand voltage and the partial discharge gas of the transformer according to claim 13, wherein the temperature range for preparing the nitrogen-containing oil sample is 30-70 ℃, and the gas pressure is 70-130 kPa.
16. The method for detecting the gas solubility, the withstand voltage and the partial discharge gas of the transformer according to claim 13, wherein a control program is pre-recorded into the PLC control system.
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| CN202210874876.3A CN115236233A (en) | 2022-07-25 | 2022-07-25 | System and method for detecting gas solubility, voltage resistance and partial discharge gas of transformer |
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| CN202210874876.3A CN115236233A (en) | 2022-07-25 | 2022-07-25 | System and method for detecting gas solubility, voltage resistance and partial discharge gas of transformer |
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| CN111707711A (en) * | 2020-06-28 | 2020-09-25 | 西安西电变压器有限责任公司 | Simulation method and device for detecting dissolved gas in oil under insulating oil electrical fault |
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