CN105759153A - Thermal aging experiment device of simulating transformer winding overload condition and method thereof - Google Patents
Thermal aging experiment device of simulating transformer winding overload condition and method thereof Download PDFInfo
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- CN105759153A CN105759153A CN201610256144.2A CN201610256144A CN105759153A CN 105759153 A CN105759153 A CN 105759153A CN 201610256144 A CN201610256144 A CN 201610256144A CN 105759153 A CN105759153 A CN 105759153A
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- 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
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
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Abstract
The invention relates to a thermal aging experiment device of simulating a transformer winding overload condition and a method thereof and belongs to the electrical equipment insulation online monitoring and fault diagnosis field. The device comprises a sealing pot, a copper electrode, a vent valve and a sensor support. The sealing pot is used for guaranteeing a sealed and anaerobic condition where a transformer winding is arranged during an aging process. The copper electrode is used for conducting a current and fixing the transformer winding. The vent valve is used for inletting nitrogen and discharging air. The sensor support is used for installing a sensor and measuring a winding temperature in a pot and an oil temperature of each area. By using the thermal aging experiment device of simulating the transformer winding overload condition and the method thereof, a temperature is taken as a target and an oilpaper insulating acceleration thermal aging test is performed through a mode of reaching a target temperature by adjusting a current flowing through the winding. An oilpaper insulation aging rule of the transformer under an overload condition is analyzed.
Description
Technical field
The invention belongs to insulation of electrical installation on-line monitoring and fault diagnosis field, relate to thermal ageing test device and method when a kind of analogue transformer winding overload.
Background technology
Power transformer is as the core of energy conversion in electric energy transmission and delivery process, and its accident caused that lost efficacy will cause the interruption of supply of electric power, and cause huge economic loss.Power transformer overload capability becomes the main cause that restriction electrical network power transformation capacity limit improves further simultaneously, when the accident conditions of N-1 occurs in transformer station, if transformator has higher overload capacity, transformator can not only be avoided to be damaged because of overload, certain time can also be reserved to scheduling, spatial load forecasting " can be effectively improved the running limit of paired running main transformer; improve main transformer rate of load condensate, the operation of electricity net safety stable is significant " within the scope of safety and stability by improving transformer overload ability.
Transformator Oil-Paper Insulation, as the important component part of insulation in transformator, is accounted for major portion by the transformer fault of its initiation.Oilpaper is subject to the impact of the factor such as electricity, heat, machinery, moisture and corrosion and aging gradually in During Process of Long-term Operation, and decreasing insulating also causes insulation defect occur, even causes the main minor insulation fault of transformator, thus threatening the safe operation of transformator.Transformator its hot(test)-spot temperature in an overload condition significantly improves, its insulation ag(e)ing speed is aggravated, and laboratory adopts the aging rule of the technique study transformator Oil-Paper Insulation of accelerated aging test at present, it often carries out in the way of winding and insulating oil heat without the temperature difference in certain oilpaper ratio simultaneously, considering transformer oil flash-point problem, its heating-up temperature is generally not capable of more than 140 DEG C., it is impossible to reaction transformator winding temperature rise in an overload condition is aging comparatively all sidedly.
Summary of the invention
In view of this, it is an object of the invention to provide thermal ageing test device and method when a kind of analogue transformer winding overload, by with temperature for controlled quentity controlled variable, in closed environment, flow through the mode to predetermined temperature of heating in winding by electric current carry out paper oil insulation accelerating thermal aging test.
An object of the present invention is to provide thermal ageing test device when a kind of analogue transformer winding overload, is achieved through the following technical solutions:
Thermal ageing test device when a kind of analogue transformer winding overload, including hermetically sealed can, copper electrode, breather valve, sensor stand；The lid of described hermetically sealed can is provided with breather valve opening, sensor insert port, and copper electrode opening, described breather valve opening is used for installing breather valve, and described sensor insert port is used for installing sensor stand, and described sensor stand is provided with sensor, described copper electrode opening is used for arranging copper electrode, the junction of copper electrode and hermetically sealed can adopts epoxy resin fastener to compress, and described copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding.
Further, described hermetically sealed can includes tank body, seals lid, seal washer and fastening clip, and tank body opening surrounding and the bottom surrounding sealing lid are provided with Baltimore groove, and seal washer is placed in Baltimore groove, is used for ensureing tank body with to seal lid airtight.
Further, described breather valve is two, is separately positioned on the two ends, left and right of sealed tank cap, for air in tank body is carried out emptying process.
Further, described copper electrode is two, and each copper electrode is respectively adopted two epoxy resin fasteners and compresses at the positive and negative of sealed tank cap, and the screw thread again through nut Yu copper electrode self screws.
Further, the upper and lower end parts of described copper electrode is respectively provided with hole, for through Transformer Winding, the upper and lower end parts vertical perforating tapping of copper electrode, connecting with hole.
Further, described sensor stand includes vertical bar, some horizon bars and external member, and described horizon bar is connected with vertical bar by external member；Described vertical bar provides for horizon bar and supports, and regulates the height of horizon bar；Horizon bar is provided with perforate, for mounting temperature sensor.
The two of the purpose of the present invention are to provide a kind of thermal ageing test method when analogue transformer winding overload, are achieved through the following technical solutions:
A kind of thermal ageing test method when analogue transformer winding overload, comprises the following steps:
Step 1) Transformer Winding turned to shape to be measured；
Step 2) transformer oil and Transformer Winding are dried process；
Step 3) Transformer Winding copper cash is put in hermetically sealed can, it is connected with the copper electrode being arranged in hermetically sealed can, sensor is placed near Transformer Winding；Copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding
Step 4) by through step 2) transformer oil that processed pours in tank body, Transformer Winding is dipped in oil, regulates the sensor stand position being arranged in hermetically sealed can, covers the sealing lid of tank body, reinforces, makes Transformer Winding and sensor be in sealed environment；
Step 5) air in hermetically sealed can is discharged；
Step 6) copper electrode is energized, make Transformer Winding self-heating, carry out degradation.
Further, described step 1) as required Transformer Winding is turned to both shaped.
Further, described step 5) by inputting nitrogen by the air discharge in hermetically sealed can, the sealing of hermetically sealed can covers and is provided with two breather valve, and a breather valve is used for inputting nitrogen, and another breather valve is used for air-out.
Further, described step 2) in dried specifically include following steps: step 21) by oil with Transformer Winding in 90 DEG C/50Pa environment, dry 48 hours；Step 22) Transformer Winding is put in oil, immersion oil 24 hours in 40 DEG C/50Pa environment.
For reaching above-mentioned purpose, the present invention provides following technical scheme:
The beneficial effects of the present invention is: thermal ageing test device when a kind of analogue transformer winding overload provided by the invention, the device provides sealing and anaerobic experiment condition, guarantee test method can realize Transformer Winding degradation under higher temperature (>=140 DEG C) less than the situation Imitating winding overload of transformer oil flash-point (140 DEG C) when, thus analyzing transformator paper oil insulation aging rule in an overload condition.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the structural representation of device of the present invention；
Fig. 2 is the structure chart of sealed shell of tank；
Fig. 3 is the mechanism map of sensor stand；
Wherein, 1 is breather valve, and 2 is sensor insert port, and 3 is epoxy resin fastener, and 4 is copper electrode, and 5 is the vertical bar of sensor stand, and 6 is horizon bar and the external member of sensor stand, and 7 is sensor, and 8 is copper electrode perforate.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
The present invention provides thermal ageing test device when a kind of analogue transformer winding overload, and this device includes the rustless steel hermetically sealed can providing ageing environment, copper electrode, breather valve, sensor stand；The lid of hermetically sealed can is provided with breather valve opening, sensor insert port, and copper electrode opening.
Hermetically sealed can includes tank body, seals lid, seal washer and fastening clip, and tank body opening surrounding and the bottom surrounding sealing lid are provided with Baltimore groove, and seal washer is placed in Baltimore groove, is used for ensureing tank body with to seal lid airtight, seals simple in construction, good sealing effect.
Breather valve opening is used for installing breather valve, and breather valve is two, it is possible to be two ball valves, is separately positioned on the two ends, left and right of sealed tank cap, and internal air nitrogen is discharged after having sealed by tank body, it is ensured that the anaerobic experiment condition in ageing process.
Sensor insert port is used for installing sensor stand, and sensor stand is provided with temperature sensor, ensureing by signal derivation on bubble-tight basis, measures winding and oil temperature temperature in tank in real time.Sealing has covered two sensor insert ports.Sensor stand includes vertical bar, some horizon bars and external member, and horizon bar is connected with vertical bar by external member；Can need different number of horizontal stand is installed according to measurement.External member has substrate hold-down function copper ring for being threaded, and horizontal stand is connected with copper ring, and copper ring and vertical bar are connected as horizon bar and provide support, it is also possible to regulate the height of horizon bar；Horizon bar is provided with perforate, for mounting temperature sensor.In experimentation, after copper winding technique is become given shape, be placed on fixing with copper electrode carries out energising after ageing can seals and heats up, and by internal sensor, the temperature of winding in tank body and each region oil temperature is carried out monitor in real time simultaneously.
Opening is used for arranging copper electrode, the junction of copper electrode and hermetically sealed can adopts epoxy resin fastener to compress, copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding, copper electrode is two, each copper electrode is respectively adopted two epoxy resin fasteners and compresses at the positive and negative of sealed tank cap, is screwed by the screw thread of nut Yu copper electrode self, makes copper electrode carry out strong bonded with sealing lid.The upper and lower end parts of copper electrode is respectively provided with porose, is used for through the flat winding of transformator, the upper and lower end parts vertical perforating tapping of copper electrode, connect with hole, the copper winding that available screw is opposite in square hole compresses, it is ensured that it is combined closely, and strengthens its frame for movement stability.
Present invention also offers a kind of thermal ageing test method when analogue transformer winding overload, specifically include following steps:
Step 1) Transformer Winding is turned to given shape；
As required Transformer Winding is turned to both shaped, as three-layer type winding can be turned to, joining end to end of its each layer ensures that electric current continues through, in ageing process identical with layer winding temperature, different layers temperature is different, therefore can obtain test temperature three kinds different in experimentation and carry out aging；What therefore can obtain under three different temperatures in experimentation in single test is aging.
Step 2) transformer oil and transformer insulated winding are dried process.
Dried specifically includes following steps: step 21) by oil and Transformer Winding in 90 DEG C/50Pa environment, dry 48 hours；Step 22) Transformer Winding is put in oil, immersion oil 24 hours in 40 DEG C/50Pa environment.
Step 3) winding copper cash is put in hermetically sealed can, it is connected with the copper electrode being arranged in hermetically sealed can, sensor is placed in winding precalculated position.Copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding.
Step 4) by through step 2) transformer oil that processed pours in tank body, Transformer Winding is dipped in oil, regulates the sensor stand position being arranged in hermetically sealed can, cover lid, reinforces and seal；
Step 5) air in hermetically sealed can is discharged；Discharging the air in hermetically sealed can by inputting high-purity nitrogen, the top of hermetically sealed can is provided with two breather valve, and a breather valve is used for inputting nitrogen, and another breather valve is used for air-out.
Step 6) copper electrode is energized, make winding self-heating, carry out degradation.Electric current is produced by strong current generator, is flowed into by the copper electrode of sealing lid exposed parts and is flowed out by another pole after making it generate heat then through winding again, forms loop.Undertaken temperature is controlled by internal sensor, it is ensured that ageing environment temperature is consistent.
What finally illustrate is, preferred embodiment above is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail by above preferred embodiment, but skilled artisan would appreciate that, in the form and details it can be made various change, without departing from claims of the present invention limited range.
Claims (10)
1. a thermal ageing test device when analogue transformer winding overload, it is characterised in that: include hermetically sealed can, copper electrode, breather valve, sensor stand；The lid of described hermetically sealed can is provided with breather valve opening, sensor insert port, and copper electrode opening, described breather valve opening is used for installing breather valve, and described sensor insert port is used for installing sensor stand, and described sensor stand is provided with sensor fastening device, described copper electrode opening is used for arranging copper electrode, the junction of copper electrode and hermetically sealed can adopts epoxy resin fastener to compress, and described copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding.
2. thermal ageing test device when a kind of analogue transformer winding overload according to claim 1, it is characterized in that: described hermetically sealed can includes tank body, seals lid, seal washer and fastening clip, tank body opening surrounding and the bottom surrounding sealing lid are provided with Baltimore groove, seal washer is placed in Baltimore groove, is used for ensureing that tank body is airtight with sealing lid.
3. thermal ageing test device when a kind of analogue transformer winding overload according to claim 1, it is characterised in that: described breather valve is two, is separately positioned on the two ends, left and right of sealed tank cap, for air in tank body is carried out emptying process.
4. thermal ageing test device when a kind of analogue transformer winding overload according to claim 1, it is characterized in that: described copper electrode is two, each copper electrode is respectively adopted two epoxy resin fasteners and compresses at the positive and negative of sealed tank cap, and the screw thread again through nut Yu copper electrode self screws.
5. thermal ageing test device when a kind of analogue transformer winding overload according to claim 1, it is characterized in that: the upper and lower end parts of described copper electrode is respectively provided with porose, for through Transformer Winding, the upper and lower end parts vertical perforating tapping of copper electrode, connecting with hole.
6. thermal ageing test device when a kind of analogue transformer winding overload according to claim 1, it is characterised in that: described sensor stand includes vertical bar, some horizon bars and external member, and described horizon bar is connected with vertical bar by external member；Described vertical bar provides for horizon bar and supports, and regulates the height of horizon bar；Horizon bar is provided with perforate, for mounting temperature sensor.
7. a thermal ageing test method when analogue transformer winding overload, it is characterised in that: comprise the following steps:
Step 1) Transformer Winding turned to shape to be measured；
Step 2) transformer oil and Transformer Winding are dried process；
Step 3) Transformer Winding copper cash is put in hermetically sealed can, it is connected with the copper electrode being arranged in hermetically sealed can, sensor is placed near Transformer Winding and winding；Copper electrode is used for connecting tank body internal and external parts, conduction electric current and stationary transformer winding；
Step 4) by through step 2) transformer oil that processed pours in tank body, Transformer Winding is dipped in oil, regulates the sensor stand position being arranged in hermetically sealed can, covers the sealing lid of tank body, reinforces, makes Transformer Winding and sensor be in sealed environment；
Step 5) use nitrogen to be discharged by the air in hermetically sealed can；
Step 6) copper electrode is energized, make Transformer Winding self-heating, carry out degradation.
8. thermal ageing test method when a kind of analogue transformer winding overload according to claim 7, it is characterised in that: described step 1) as required Transformer Winding is turned to both shaped.
9. thermal ageing test method when a kind of analogue transformer winding overload according to claim 7, it is characterized in that: described step 5) by inputting nitrogen by the air discharge in hermetically sealed can, the sealing of hermetically sealed can covers and is provided with two breather valve, one breather valve is used for inputting nitrogen, and another breather valve is used for air-out.
10. thermal ageing test method when a kind of analogue transformer winding overload according to claim 7, it is characterized in that: described step 2) in dried specifically include following steps: step 21) by oil and Transformer Winding in 90 DEG C/50Pa environment, dry 48 hours；Step 22) Transformer Winding is put in oil, immersion oil 24 hours in 40 DEG C/50Pa environment.
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| CN201610256144.2A CN105759153B (en) | 2016-04-22 | 2016-04-22 | A kind of thermal ageing test device and method under the conditions of analogue transformer winding overload |
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| CN201610256144.2A CN105759153B (en) | 2016-04-22 | 2016-04-22 | A kind of thermal ageing test device and method under the conditions of analogue transformer winding overload |
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| CN105759153B CN105759153B (en) | 2018-06-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106644557A (en) * | 2017-01-04 | 2017-05-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Transformer-insulating-material same-condition-aging staging sampling testing device |
| CN107843789A (en) * | 2017-11-02 | 2018-03-27 | 国家电网公司 | Transformer Winding entirety aging testing method |
| CN110275095A (en) * | 2019-06-12 | 2019-09-24 | 国网浙江省电力有限公司电力科学研究院 | Transformer insulated accelerated deterioration simulator and method |
| CN110462361A (en) * | 2016-12-31 | 2019-11-15 | Abb瑞士股份有限公司 | System and method for the component in Monitoring Power Transformer etc. |
| CN111371069A (en) * | 2020-04-14 | 2020-07-03 | 攀钢集团西昌钢钒有限公司 | Overtemperature protection device for transformer |
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| CN107843789B (en) * | 2017-11-02 | 2020-02-28 | 国家电网公司 | Integral aging test method for transformer winding |
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| CN111371069A (en) * | 2020-04-14 | 2020-07-03 | 攀钢集团西昌钢钒有限公司 | Overtemperature protection device for transformer |
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