CN110082615B - Temperature rise test method for buried transformer - Google Patents
Temperature rise test method for buried transformer Download PDFInfo
- Publication number
- CN110082615B CN110082615B CN201810099317.3A CN201810099317A CN110082615B CN 110082615 B CN110082615 B CN 110082615B CN 201810099317 A CN201810099317 A CN 201810099317A CN 110082615 B CN110082615 B CN 110082615B
- Authority
- CN
- China
- Prior art keywords
- pit
- transformer
- temperature
- test
- buried
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides a temperature rise test method of an underground transformer, which is characterized by comprising the following steps of: the highest position of the transformer in the pit or direct burial environment of the test environment a is 1000mm lower than the ground surface, one side of the pit or the periphery of the transformer is provided with a close heat insulation wall, the distance between the pit or the transformer and the inner wall of the pit is not more than 600mm, the width of the pit or the periphery of the transformer is at least 1.5 times of the width of the inner wall of the pit on the same side and the pit is as deep as the pit, if other building objects are more than 2000mm far away from the pit or the transformer, but at least two sides are more than 5000mm, otherwise, the special temperature rise requirement is considered. b, selecting a temperature measuring point, namely arranging at least 1 temperature measuring point of the direct-buried transformer at the long side and the wide side of the pit, wherein the distance from the temperature measuring point to the outer wall of the transformer is 100mm, and the depth of the temperature measuring point is 1000mm and 1500 mm; the temperature sensor is arranged below a pit top cover plate and used for testing the pit top temperature; a temperature sensor is arranged on the pit wall of the same horizontal line of the pit bottom and the transformer bottom and used for testing the pit bottom temperature; in order to measure the top oil temperature, a temperature sensor is implanted in a thermometer base of the tank cover.
Description
The technical field is as follows:
the invention relates to a temperature rise test method of a transformer, in particular to a temperature rise test method of an underground transformer, and specifically relates to a temperature rise test method of an underground transformer.
Background art:
in recent years, with the continuous development of transformer technology and the buried arrangement of distribution transformers with heavy national power grid, the development prospect of buried transformers is bright, but with the continuous development of the buried transformer technology, the increase of the coverage of products, the change of the requirements of the use environment of the products and the like, the related temperature rise test method and the requirements in the existing standard JB/T10544-2006 cannot comprehensively reflect the technical characteristics of the products: the temperature rise test of the buried transformer is carried out under the buried condition and the rated heating state, whether the total loss (no-load loss and load loss) generated by the transformer and the temperature of the heat balance formed by the peripheral soil meet the regulation of the standard or not is detected, the rationality of the product design and the buried condition is checked, and the degree of local overheating of the product and the periphery of the buried transformer is found. The test method is used for the first time in the temperature rise test of the underground transformer from the design of the environment and the selection of the measurement point, thereby solving the problem that the traditional temperature rise test can not simulate the complete working condition running environment.
The invention content is as follows:
the invention aims to provide a temperature rise test method for an underground transformer, which solves the problems of the temperature rise test of the underground transformer: whether the total loss (no-load loss and load loss) generated by the transformer and the temperature forming heat balance with the peripheral soil in the underground condition and the rated heating state meet the standard regulation or not, the reasonability of the product design and the underground condition is checked, and the degree of local overheating of the product and the periphery of the underground is found.
In order to achieve the aim, the invention provides a temperature rise test method of an underground transformer, which is characterized by comprising the following steps of:
test environment
and a.1, the ventilation phenomenon of heat exchange with the atmosphere does not occur during the test of the buried transformer. The highest position of the transformer when the transformer is buried in a pit or directly buried in the pit is 1000mm lower than the ground surface, one side of the pit or the periphery of the transformer is provided with a close heat insulation wall, the distance between the pit or the periphery of the transformer and the inner wall of the pit is not more than 600mm, the width of the pit or the periphery of the transformer is at least 1.5 times of the width of the inner wall of the pit on the same side and is as deep as the pit, if other building objects are more than 2000mm far away from the pit or the transformer, but at least two sides of the pit or the transformer are more than 5000mm, otherwise, the requirement of special temperature rise is considered.
and a.2, the soil around the pit or the transformer should be composed of fine sand of not less than 50 percent, and stones with the diameter of more than 50mm (except the bottom) cannot exist in the thickness of 500 mm. The pit can be of a concrete or brick wall structure, and the inner wall of the pit is smoothed by applying cement.
a.3, in order to ensure the anhydrous test effect in the pit, automatic drainage facilities such as a water pump and the like are arranged in the pit; meanwhile, an overflow port is arranged, and the position of the overflow port and the positions of the inlet and the outlet of the high-low voltage cable are in a horizontal plane so as to ensure the control of the water level in the pit when a water test is carried out (if necessary). Because the pit is totally enclosed during the temperature rise test, in order to effectively monitor the condition in the pit during the test, can set up monitoring facility.
a.4 the size of the test pit can be set according to the maximum test capacity, the distance between the periphery of the transformer and the pit wall is not less than 150mm, the distance between the highest point of a cover plate of the transformer tank and the top cover plate of the pit is ensured not to be more than 500mm when the pit is buried, and when the test of the small-capacity transformer is carried out, the transformer can be arranged on the top of the pit and can be filled with liquid such as water and the like to the position of the bottom of the transformer so as to achieve the effect of simulating the bottom of the pit.
and a.5, the buried high-voltage and low-voltage cable is hermetically connected with the transformer and then is led to the ground through a reserved high-voltage and low-voltage cable inlet and outlet hole, so that the requirement of test connection is facilitated.
b temperature measurement Point selection
b.1, setting at least 1 temperature measuring point on each side of the length and the width of the pit according to the heat conductivity and the symmetry principle during the test of the direct-buried transformer, wherein the distance between the temperature measuring points and the outer wall of the transformer is 100mm, and the depths of the temperature measuring points are 1000mm and 1500mm respectively and are used for measuring the ambient temperature;
b.2, for the pit buried type transformer, a temperature sensor is arranged below a pit top cover plate at the inner wall of the pit and used for testing the temperature of the pit top; and meanwhile, a temperature sensor is arranged on the pit wall of the same horizontal line of the pit bottom and the transformer bottom and used for testing the pit bottom temperature.
And b.3, measuring the top oil temperature, implanting a temperature sensor in a thermometer base of the tank cover, and sticking a temperature sensor at the bottom of the oil tank.
The buried transformer temperature rise test method is further characterized in that the temperature rise test wiring and method, the temperature rise test duration and the winding temperature measurement meet the requirements of JB/T501 and GB 1094.2.
The buried transformer temperature rise test method is further characterized in that the winding temperature rise calculation and the top layer oil temperature rise calculation meet the requirements of JB/T501 and GB 1094.2.
Description of the drawings:
FIG. 1 is a schematic view of a temperature rise test pit according to the present invention.
Fig. 2 is a schematic diagram of the temperature measuring point of the direct-buried transformer environment.
FIG. 3 is a schematic view of the temperature measuring point of the buried transformer of the present invention.
The specific implementation mode is as follows:
as shown in fig. 1, the invention provides a temperature rise test method for an underground transformer, which is characterized by comprising the following steps:
a.1, the buried transformer should not have ventilation phenomenon of heat exchange with the atmosphere when tested, the highest position of the transformer when buried in a pit or directly buried should be 1000mm lower than the earth surface, one side of the pit or the periphery of the transformer should be a close heat insulation wall, the distance between the pit and the inner wall of the transformer or the transformer should not be more than 600mm, the width is at least 1.5 times of the width of the inner wall of the pit on the same side and the same depth as the pit, if other building objects should be more than 2000mm away from the pit or the transformer, but at least two sides are more than 5000mm, otherwise, the temperature rise requirement is regarded as special.
and a.2, the soil around the pit or the transformer should be composed of fine sand of not less than 50 percent, and stones with the diameter of more than 50mm (except the bottom) cannot exist in the thickness of 500 mm. The pit can be of a concrete or brick wall structure, and the inner wall of the pit is smoothed by applying cement.
a.3, in order to ensure the anhydrous test effect in the pit, automatic drainage facilities such as a water pump and the like are arranged in the pit; meanwhile, an overflow port is arranged, and the position of the overflow port and the positions of the inlet and the outlet of the high-low voltage cable are in a horizontal plane so as to ensure the control of the water level in the pit when a water test is carried out (if necessary). Because the pit is totally enclosed during the temperature rise test, in order to effectively monitor the condition in the pit during the test, can set up monitoring facility.
a.4 the size of the test pit can be set according to the maximum test capacity, the distance between the periphery of the transformer and the pit wall is not less than 150mm, the distance between the highest point of a cover plate of the transformer tank and the top cover plate of the pit is ensured not to be more than 500mm when the pit is buried, and when the test of the small-capacity transformer is carried out, the transformer can be arranged on the top of the pit and can be filled with liquid such as water and the like to the position of the bottom of the transformer so as to achieve the effect of simulating the bottom of the pit.
and a.5, the buried high-voltage and low-voltage cable is hermetically connected with the transformer and then is led to the ground through a reserved high-voltage and low-voltage cable inlet and outlet hole, so that the requirement of test connection is facilitated.
As shown in fig. 2 and 3, the invention provides a temperature rise test method for an underground transformer, which is characterized by comprising the following steps:
b.1, setting at least 1 temperature measuring point on each side of the length and the width of the pit according to the heat conductivity and the symmetry principle during the test of the direct-buried transformer, wherein the distance between the temperature measuring points and the outer wall of the transformer is 100mm, and the depths of the temperature measuring points are 1000mm and 1500mm respectively and are used for measuring the ambient temperature;
b.2, for the pit buried type transformer, a temperature sensor is arranged below a pit top cover plate at the inner wall of the pit and used for testing the temperature of the pit top; and meanwhile, a temperature sensor is arranged on the pit wall of the same horizontal line of the pit bottom and the transformer bottom and used for testing the pit bottom temperature.
And b.3, measuring the top oil temperature, implanting a temperature sensor in a thermometer base of the tank cover, and sticking a temperature sensor at the bottom of the oil tank.
The buried transformer temperature rise test method is further characterized in that the temperature rise test wiring and method, the temperature rise test duration and the winding temperature measurement meet the requirements of JB/T501 and GB 1094.2.
The buried transformer temperature rise test method is further characterized in that the winding temperature rise calculation and the top layer oil temperature rise calculation meet the requirements of JB/T501 and GB 1094.2.
c temperature determination
The temperature of the top layer is determined by a thermometer or temperature sensor in a thermometer seat implanted in the lid of the case. For the determination of the ambient temperature:
a direct-buried transformer:
in the formula: thetaa-ambient temperature C
θ1-pit edge temperature measurement point 1 deg.C
θ2-pit edge temperature measurement point 2 deg.C
A buried transformer:
in the formula: thetaa-ambient temperature C
θk1-temperature of the top layer in the pit
θk2Bottom temperature in pit
Average temperature of oil:
in the formula: thetaoAverage temperature of oil C
θo1Oil top layer temperature C
θo2-temperature of bottom layer of oil tank
Winding hot spot temperature rise:
in the formula: τ r-winding hot spot temperature rise deg.C
τ o-average temperature rise of oil ℃
Delta tau-average temperature rise of winding to oil DEG C
θo1Oil top layer temperature C
θo2-temperature of bottom layer of oil tank
KH-hot point factor, KH 1.1-1.5, 1.1 for distribution transformer, 1.3 for large and medium-sized transformer
d discrimination of test results
The temperature rise or temperature of the test result meets the temperature-resistant grade requirements of the turn insulation and layer insulation material and the insulating liquid of the underground transformer.
Claims (3)
1. A temperature rise test method for an underground transformer is characterized by comprising the following steps:
a test environment
a.1, the buried transformer test should not generate the ventilation phenomenon of heat exchange with the atmosphere, the highest position of the transformer when buried in a pit or directly buried should be 1000mm lower than the ground surface, one side of the pit or the periphery of the transformer should be provided with a near heat insulation wall, the distance between the pit and the inner wall of the transformer or the transformer should not be more than 600mm, the width is at least 1.5 times of the width of the inner wall of the pit on the same side and the same depth as the pit, if other building objects are more than 2000mm far away from the pit or the transformer, but at least two sides are more than 5000mm, otherwise, the special temperature rise requirement is considered;
a.2, the soil around the pit or the transformer is composed of fine sand which is not less than 50 percent, and stones with the diameter of more than 50mm cannot exist in the thickness of 500 mm; the pit adopts a concrete or brick wall structure, and the inner wall of the pit is trowelled by applying cement;
a.3, in order to ensure the anhydrous test effect in the pit, a water pump is arranged in the pit for draining water; meanwhile, an overflow port is arranged, and the position of the overflow port and the positions of the high-voltage cable inlet and the low-voltage cable outlet are in the same horizontal plane, so that the control of the water level in the pit is ensured during a water test; because the pit is fully sealed during the temperature rise test, a monitoring facility is arranged for effectively monitoring the condition in the pit during the test;
a.4, setting the size of a test pit according to the maximum test capacity, wherein the distance between the periphery of a transformer and the pit wall is not less than 150mm, the distance between the highest point of a transformer box cover and a pit top cover plate when the pit is buried is not more than 500mm, and when a small-capacity transformer test is carried out, raising the transformer at the bottom of the pit and filling water to the position of a transformer bottom pin so as to achieve the effect of simulating the bottom of the pit;
a.5, after the buried high-voltage and low-voltage cables are hermetically connected with the transformer, the buried high-voltage and low-voltage cables are led to the ground through the reserved high-voltage and low-voltage cable inlet and outlet holes so as to facilitate the requirement of test connection;
b temperature measurement Point selection
b.1, setting at least 1 temperature measuring point on each side of the length and the width of the pit according to the heat conductivity and the symmetry principle during the test of the direct-buried transformer, wherein the distance between the temperature measuring points and the outer wall of the transformer is 100mm, and the depths of the temperature measuring points are 1000mm and 1500mm respectively and are used for measuring the ambient temperature;
b.2, for the pit buried type transformer, a temperature sensor is arranged below a pit top cover plate at the inner wall of the pit and used for testing the temperature of the pit top; meanwhile, a temperature sensor is arranged on the pit wall of the same horizontal line of the pit bottom and the transformer bottom and used for testing the pit bottom temperature;
b.3, measuring the top oil temperature, implanting a temperature sensor in a thermometer base of the tank cover, and simultaneously attaching a temperature sensor at the bottom of the oil tank;
c. temperature determination:
the temperature of the top layer is determined by a thermometer or a temperature sensor in a thermometer seat implanted on the box cover; for the determination of the ambient temperature:
a direct-buried transformer:
in the formula: thetaa-ambient temperature C
θ1-pit edge temperature measurement point 1 deg.C
θ2-pit edge temperature measurement point 2 deg.C
A buried transformer:
in the formula: thetaa-ambient temperature C
θk1-temperature of the top layer in the pit
θk2Bottom temperature in pit
Average temperature of oil:
in the formula: thetaoAverage temperature of oil C
θo1Oil top layer temperature C
θo2-temperature of bottom layer of oil tank
Winding hot spot temperature rise:
in the formula: tau isr-winding hot spot temperature rise deg.C
τoAverage temperature rise of oil C
Δτ-average temperature rise of winding to oil
θo1Oil top layer temperature C
θo2-temperature of bottom layer of oil tank
KH-hot point factor, KH 1.1-1.5, 1.1 for distribution transformer, 1.3 for large and medium-sized transformer
d. And (3) judging test results:
the temperature rise or temperature of the test result meets the temperature-resistant grade requirements of the turn insulation and layer insulation material and the insulating liquid of the underground transformer.
2. The buried transformer temperature rise test method according to claim 1, characterized in that: the temperature rise test wiring and method, the temperature rise test duration and the winding temperature measurement meet the requirements of JB/T501 and GB 1094.2.
3. The buried transformer temperature rise test method according to claim 2, characterized in that: and the winding temperature rise calculation and the top oil temperature rise calculation meet the requirements of JB/T501 and GB 1094.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810099317.3A CN110082615B (en) | 2018-01-26 | 2018-01-26 | Temperature rise test method for buried transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810099317.3A CN110082615B (en) | 2018-01-26 | 2018-01-26 | Temperature rise test method for buried transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110082615A CN110082615A (en) | 2019-08-02 |
| CN110082615B true CN110082615B (en) | 2021-08-24 |
Family
ID=67412715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810099317.3A Active CN110082615B (en) | 2018-01-26 | 2018-01-26 | Temperature rise test method for buried transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110082615B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835006A (en) * | 2021-09-24 | 2021-12-24 | 南方电网科学研究院有限责任公司 | Method and device for testing step temperature rise test of thermosetting epoxy insulating part and application |
| CN116432406B (en) * | 2023-03-09 | 2024-02-02 | 广东电网有限责任公司佛山供电局 | Method and device for calculating hot spot temperature of working winding of oil immersed transformer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200969278Y (en) * | 2006-10-24 | 2007-10-31 | 上海置信电气非晶有限公司 | Direct-buried amorphous alloy oil transformer |
| CN101651013A (en) * | 2008-08-13 | 2010-02-17 | 上海市电力公司 | Radiating structure of buried distribution transformer |
| CN101964245A (en) * | 2009-07-24 | 2011-02-02 | 上海瑞奇电气设备有限公司 | Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection |
| CN103558810A (en) * | 2006-03-16 | 2014-02-05 | 功率监视器公司 | Underground monitoring system and method |
| CN106932219A (en) * | 2017-05-03 | 2017-07-07 | 国网上海市电力公司 | A kind of transformer Cooling simulation test device that formula is arranged based on split |
| CN107066799A (en) * | 2017-01-03 | 2017-08-18 | 国网上海市电力公司 | A kind of split type cooling hot-spot temperature of transformer computational methods in underground substation |
| CN107462802A (en) * | 2017-08-18 | 2017-12-12 | 国网上海市电力公司 | A kind of 500kV underground substations earthed system state evaluating method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140172327A1 (en) * | 2012-12-18 | 2014-06-19 | Eaton Corporation | Underground transformer electrical fault detection using acoustic sensing technology |
| US20140176336A1 (en) * | 2012-12-21 | 2014-06-26 | eLuminon, LLC. | System, method, and apparatus for remotely monitoring surge arrester conditions |
-
2018
- 2018-01-26 CN CN201810099317.3A patent/CN110082615B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558810A (en) * | 2006-03-16 | 2014-02-05 | 功率监视器公司 | Underground monitoring system and method |
| CN200969278Y (en) * | 2006-10-24 | 2007-10-31 | 上海置信电气非晶有限公司 | Direct-buried amorphous alloy oil transformer |
| CN101651013A (en) * | 2008-08-13 | 2010-02-17 | 上海市电力公司 | Radiating structure of buried distribution transformer |
| CN101964245A (en) * | 2009-07-24 | 2011-02-02 | 上海瑞奇电气设备有限公司 | Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection |
| CN107066799A (en) * | 2017-01-03 | 2017-08-18 | 国网上海市电力公司 | A kind of split type cooling hot-spot temperature of transformer computational methods in underground substation |
| CN106932219A (en) * | 2017-05-03 | 2017-07-07 | 国网上海市电力公司 | A kind of transformer Cooling simulation test device that formula is arranged based on split |
| CN107462802A (en) * | 2017-08-18 | 2017-12-12 | 国网上海市电力公司 | A kind of 500kV underground substations earthed system state evaluating method |
Non-Patent Citations (2)
| Title |
|---|
| Direct-Buried Transformer Thermal Tests;NICHOLAS A. LUCIC;《IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS》;19701031;第89卷(第7期);第1662-1669页 * |
| 地埋式变压器温升及地埋系统热传递过程;胡敏 等;《高电压技术》;20090630;第35卷(第6期);第1497-1501页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110082615A (en) | 2019-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110082615B (en) | Temperature rise test method for buried transformer | |
| CN104330659B (en) | Quasi dynamic compatibilization method based on cable heat transmission model | |
| CN205374438U (en) | Deformation test device of salinized soil road bed under dry -wet cycle effect | |
| CN205120702U (en) | Water quality monitoring device for aquaculture | |
| CN101988886B (en) | Simulation test device for studying slope runoff and underground hole fissure flow | |
| CN205134394U (en) | Detect device of suction bucket shape basis resistance to plucking bearing capacity under slope loading | |
| CN104502562A (en) | Vertical well drainage consolidation soft foundation processing model test device and test method | |
| CN105784935B (en) | A kind of multi-functional ice-melt snow pavement test device and evaluation method | |
| CN108181446A (en) | A kind of permafrost region tunnel-liner local ponding Frozen-thawed cycled effect behind is simulated, monitoring device | |
| CN102864793A (en) | Test device for simulating permafrost region well heat insulation or heating | |
| CN203720123U (en) | Cold region tunnel indoor testing device | |
| CN109030236A (en) | A kind of Urban Underground comprehensive pipe gallery structure fire-resistance behavior experimental rig and test method | |
| CN110824141A (en) | Multifunctional frozen soil model test device and test method thereof | |
| CN104712847B (en) | A kind of shallow embedding flexible duct construction method | |
| CN108802349B (en) | Indoor test method considering influence of thermo-oxidative aging and water damage coupling effect on OGFC performance under normal pressure environment | |
| CN109723025B (en) | Underground structure boundary seepage test device and using method thereof | |
| CN105806676B (en) | A kind of accurate device for preparing different water cut ground sample | |
| CN109540463B (en) | Testing device and testing method for circulating water flow freezing model of long-distance water diversion channel | |
| CN107653911B (en) | A kind of battery well and its application method monitoring valve chamber | |
| CN203367936U (en) | Cable trench | |
| CN206339363U (en) | A kind of simple underground structure Analysis of Buoyancy model test apparatus | |
| CN114018970B (en) | Multifunctional freezing low-temperature model test device for cold region | |
| CN109188333A (en) | A kind of Resistance of Grounding Grids small scale test model and modification method | |
| CN212159795U (en) | Debris flow starting indoor simulation test device | |
| CN206992198U (en) | A kind of Liftable type underground waterproof battery compartment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: SHANGHAI RUIQI ELECTRICAL EQUIPMENT Co.,Ltd. Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
|
| DD01 | Delivery of document by public notice | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Xu Xingcai Document name: Notification of conformity |
|
| DD01 | Delivery of document by public notice |