CN112635214A - Device and method for protecting deformation of top cover of converter transformer on-load voltage regulation switch - Google Patents
Device and method for protecting deformation of top cover of converter transformer on-load voltage regulation switch Download PDFInfo
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- CN112635214A CN112635214A CN202011468904.9A CN202011468904A CN112635214A CN 112635214 A CN112635214 A CN 112635214A CN 202011468904 A CN202011468904 A CN 202011468904A CN 112635214 A CN112635214 A CN 112635214A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 239000007769 metal material Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
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- 230000018109 developmental process Effects 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0044—Casings; Mountings; Disposition in transformer housing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses a device and a method for protecting the deformation of a top cover of a converter transformer on-load voltage regulating switch, which comprises an oil pressure starting unit and a strain protection unit, wherein the oil pressure starting unit and the strain protection unit are arranged on the top cover of the converter transformer voltage regulating switch, the oil pressure starting unit comprises a high-frequency dynamic oil pressure sensor, the strain protection unit comprises a strain sensor, and the strain monitoring unit is also connected with a tripping unit. The application of the invention has irreplaceable protection function for reliably and quickly discriminating the plastic deformation of the top cover. The device can run reliably for a long time, is not influenced by strong electromagnetism and oil pollution environments, has the advantages of high response speed and high measurement frequency, does not inject harmonic waves into a power system in the running process, and does not influence the normal running of primary and secondary equipment in a transformer substation.
Description
Technical Field
The invention belongs to the field of power equipment protection, and relates to a deformation protection device and method for a top cover of a converter transformer on-load voltage regulating switch, which are used for monitoring, analyzing and recording deformation state characteristics of the top cover of the converter transformer voltage regulating switch to realize fault judgment and removal.
Background
The safe operation of the power grid is the basis for ensuring continuous and stable power supply and the safety of the power grid. With the rapid development of the extra-high voltage direct current transmission project, the operation of the power grid puts higher requirements on the safety and reliability of the power transmission and transformation equipment. Unlike ac components in the system, failure of a dc critical device generally results in a partial loss of dc power, and an imbalance of power will cause frequency and voltage fluctuations in the transmitting and receiving systems. With the increasing transmission power of extra-high voltage direct current, the influence of direct current faults on the operation of an alternating current system is increasingly serious.
The converter transformer is used as a core device for energy conversion and transmission of the converter station, and due to huge economic direct loss (including equipment loss and electric quantity loss) caused by the fault and huge indirect loss caused by power failure, the converter transformer becomes a key and significant influence factor for faults of the transformer substation and the converter station. In 2017, serious converter transformer ignition accidents occur continuously in China, and partial transformer equipment is damaged due to the accidents, so that severe influence and serious economic loss are caused. In these accidents, the top cover of the pressure regulating switch is broken and exploded due to sudden rise of fault oil pressure in the oil chamber, so that a reliable and rapid relay protection device and method aiming at the deformation characteristic of the top cover of the pressure regulating switch are urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a device and a method for protecting the deformation of a top cover of a converter transformer on-load voltage regulating switch, the method realizes the reliable and quick discrimination of the plastic deformation of the metal top cover of the voltage regulating switch by measuring and analyzing the oil pressure of an oil chamber of the voltage regulating switch and the strain transient characteristics of the top cover, and sends a trip signal when the top cover is plastically deformed so as to avoid the occurrence of subsequent rupture and explosion accidents and greatly improve the operation safety of the converter transformer.
In order to achieve the purpose, the invention adopts the technical scheme that:
the converter transformer on-load tap changer top cover state monitoring device comprises an oil pressure starting unit and a strain protection unit, wherein the oil pressure starting unit and the strain protection unit are arranged on a converter transformer top cover, the oil pressure starting unit comprises a high-frequency dynamic oil pressure sensor, the strain protection unit comprises a strain sensor, and the strain monitoring unit is further connected with a tripping unit.
The method for protecting the deformation of the top cover of the converter transformer on-load tap changer comprises the following steps:
step 1: measuring the oil pressure in the oil chamber of the pressure regulating switch in real time to obtain a real-time oil pressure characteristic quantity;
step 2: judging whether the real-time oil pressure characteristic quantity exceeds an oil pressure starting threshold value, if so, entering a step 3, otherwise, returning to the step 1;
and step 3: measuring the deformation of the top cover in real time to obtain real-time strain characteristic quantity;
and 4, step 4: judging whether the real-time strain characteristic quantity exceeds a strain protection threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending out a deformation tripping signal.
The invention is further improved in that the high-frequency dynamic oil pressure sensor arranged at the top of the pressure regulating switch is used for measuring the oil pressure in the oil chamber of the pressure regulating switch in real time to obtain the real-time oil pressure characteristic quantity.
The invention has the further improvement that the deformation of the top cover is measured in real time by the strain sensor arranged on the top cover of the pressure regulating switch to obtain the real-time strain characteristic quantity;
the invention is further improved in that the oil pressure starting unit judges whether the real-time oil pressure characteristic quantity exceeds an oil pressure starting threshold value.
The invention has the further improvement that whether the real-time strain characteristic quantity exceeds the strain protection threshold value is judged by the strain monitoring unit.
A further improvement of the invention is that the oil pressure activation threshold is 0.5 times the pressure relief valve actuation threshold.
The invention is further improved in that the strain monitoring threshold value is 1.05 times of the yield strain of the metal material of the top cover of the pressure regulating switch.
A further improvement of the present invention is that the morphed trip signal is issued by the trip unit.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the oil pressure starting unit utilizes the high-frequency dynamic oil pressure sensor to measure the transient oil pressure change characteristic of the top of the pressure regulating switch oil chamber, the strain protection unit utilizes the strain sensor arranged on the top cover of the pressure regulating switch to measure the deformation characteristic of the metal top cover, and the requirements of high-temperature, greasy dirt and strong electromagnetic environment in the converter transformer can be met no matter from precision or application range. The protection device is independent of a power network, the interference on measurement and signal transmission is small, and harmonic waves are not injected into a power system. The invention has the advantages of simple structure, easy realization, reliability, high efficiency and the like.
The invention monitors and analyzes the transient oil pressure at the top of the pressure-regulating switch oil chamber through the oil pressure starting unit so as to avoid protection misoperation caused by the shaking of the top cover due to the action of the mechanical control mechanism. Through being compared with a preset oil pressure starting threshold, the quick and reliable starting under the fault oil pressure is realized. The strain protection unit is directly arranged on the metal top cover, can quickly sense the deformation change characteristics of the top cover, and realizes reliable and quick discrimination of plastic deformation of the top cover by comparing with a preset threshold value. The application of the invention has irreplaceable protection function for reliably and quickly discriminating the plastic deformation of the top cover. The device can run reliably for a long time, is not influenced by strong electromagnetism and oil pollution environments, has the advantages of high response speed and high measurement frequency, does not inject harmonic waves into a power system in the running process, and does not influence the normal running of primary and secondary equipment in a transformer substation.
Drawings
Fig. 1 is a schematic diagram of a deformation protection device for a top cover of a converter transformer on-load tap changer.
FIG. 2 is a logic flow diagram of the present invention.
In the figure, 1 is a converter transformer, 2 is a voltage regulating switch, 3 is a top cover, 4 is an oil conservator, 5 is an oil pressure starting unit, 6 is a strain protection unit, and 7 is a tripping unit.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, change of current transformer on-load tap changer top cap deformation protection device, including the vibration oil pressure start unit 5 and the strain protection unit 6 that top cap 3 set up on change of current transformer 1 tap changer 2, oil pressure start unit 5 includes high frequency developments oil pressure sensor, and strain protection unit 6 includes strain sensor, and strain protection unit 6 still is connected with trip unit 7, and 1 one side of change of current transformer is provided with conservator 4. The top cover 3 is a metal top cover. The pressure regulating switch 2 is arranged on the pressure regulating switch oil chamber.
Referring to fig. 2, the method for protecting the deformation of the top cover of the converter transformer on-load tap changer comprises the following steps:
step 1: after the device is electrified and started, reading a preset oil pressure starting threshold value psetAnd strain protection threshold epsilonset；
Step 2: the oil pressure at the top of the oil chamber of the pressure regulating switch is measured in real time by using a high-frequency dynamic oil pressure sensor arranged at the top of the pressure regulating switch, and the measured real-time oil pressure characteristic quantity p is outputoil(t)；
And step 3: determining real-time oil pressure characteristic quantity p by oil pressure starting unitoil(t) whether or not the oil pressure activation threshold value p is exceededsetWhether or not the oil pressure start criterion p is satisfiedoil(t)≥pset. If yes, entering the step 4, otherwise, returning to the step 2;
and 4, step 4: the strain sensor arranged on the top cover of the pressure regulating switch is used for measuring the deformation of the top cover in real time and outputting the measured real-time strain characteristic quantity epsiloncv(t)；
And 5: the strain monitoring unit is used for judging the real-time strain characteristic quantity epsiloncv(t) whether or not it exceeds a strain protection threshold εsetThat is toWhether the protection criterion epsilon is satisfiedcv(t)≥εset. If the condition is met, entering the step 6, otherwise, returning to the step 2;
step 6: and a deformation trip signal is sent through the trip unit, and transient oil pressure and top cover strain data of 500ms before and after tripping are stored at the same time, so that the whole device is reset.
The invention is further improved in that the oil pressure starting threshold value p is calculated according to a large number of field tests, operation experiences and theoriessetThe setting is made in accordance with 0.5 times the operation threshold value of the installed pressure relief valve.
The invention is further improved in that the strain monitoring threshold value epsilon is calculated according to a large number of field tests, operation experiences and theoretical calculation resultssetThe yield strain of the metal material of the top cover of the pressure regulating switch is set to be 1.05 times.
The invention organically combines and reasonably matches the oil pressure starting unit, the strain protection unit, the trip unit and the like, so that the whole protection device and method have the advantages of simple structure, easy realization, correctness, high efficiency and the like, and can be directly realized on equipment through programming.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The device for monitoring the state of the top cover of the converter transformer on-load voltage regulating switch is characterized by comprising an oil pressure starting unit (5) and a strain protection unit (6) which are arranged on the top cover (3) of the converter transformer voltage regulating switch, wherein the oil pressure starting unit (5) comprises a high-frequency dynamic oil pressure sensor, the strain protection unit (6) comprises a strain sensor, and the strain monitoring unit (6) is further connected with a tripping unit (7).
2. The method for protecting the deformation of the top cover of the converter transformer on-load tap changer is characterized by comprising the following steps of:
step 1: measuring the oil pressure in the oil chamber of the pressure regulating switch in real time to obtain a real-time oil pressure characteristic quantity;
step 2: judging whether the real-time oil pressure characteristic quantity exceeds an oil pressure starting threshold value, if so, entering a step 3, otherwise, returning to the step 1;
and step 3: measuring the deformation of the top cover in real time to obtain real-time strain characteristic quantity;
and 4, step 4: judging whether the real-time strain characteristic quantity exceeds a strain protection threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending out a deformation tripping signal.
3. The method for protecting the deformation of the top cover of the converter transformer on-load tap changer according to claim 2, wherein the oil pressure inside the pressure regulating switch oil chamber is measured in real time by a high-frequency dynamic oil pressure sensor arranged at the top of the pressure regulating switch.
4. The method for protecting the deformation of the top cover of the converter transformer on-load tap changer according to claim 2, wherein the deformation of the top cover is measured in real time by a strain sensor arranged on the top cover of the tap changer.
5. The method for protecting the deformation of the top cover of the converter transformer on-load tap changer according to claim 2, wherein an oil pressure starting unit is used for judging whether the real-time oil pressure characteristic quantity exceeds an oil pressure starting threshold value.
6. The converter transformer on-load tap changer top cover deformation protection method according to claim 2, characterized in that whether the real-time strain characteristic quantity exceeds a strain protection threshold value is judged through a strain monitoring unit.
7. The converter transformer on-load tap changer top cover deformation protection method according to claim 2, wherein the oil pressure starting threshold value is 0.5 times of the pressure release valve action threshold value.
8. The method for protecting the deformation of the top cover of the converter transformer on-load tap changer according to claim 2, wherein the strain monitoring threshold value is 1.05 times of the yield strain of the metal material of the top cover of the tap changer.
9. The converter transformer on-load tap changer top cover deformation protection method according to claim 2, characterized in that a deformation trip signal is sent through the trip unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011468904.9A CN112635214B (en) | 2020-12-14 | 2020-12-14 | Converter transformer on-load voltage regulation switch top cover deformation protection device and method |
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| CN202011468904.9A CN112635214B (en) | 2020-12-14 | 2020-12-14 | Converter transformer on-load voltage regulation switch top cover deformation protection device and method |
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| CN112635214B CN112635214B (en) | 2022-05-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440783A (en) * | 2021-12-31 | 2022-05-06 | 西安交通大学 | Transformer oil tank body deformation monitoring device and method |
| CN114446599A (en) * | 2021-12-31 | 2022-05-06 | 西安交通大学 | Transformer oil tank deformation monitoring and protecting integrated device and method |
| CN114509705A (en) * | 2021-12-31 | 2022-05-17 | 西安交通大学 | Transformer state monitoring device and method based on strain characteristics of explosion-proof material |
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| CN110061473A (en) * | 2019-05-07 | 2019-07-26 | 北京中瑞和电气有限公司 | A kind of transformer digital protection equipment and method based on pressure list amount information |
| CN110500371A (en) * | 2019-08-27 | 2019-11-26 | 戴腾清 | A kind of stamping line equipment working state detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440783A (en) * | 2021-12-31 | 2022-05-06 | 西安交通大学 | Transformer oil tank body deformation monitoring device and method |
| CN114446599A (en) * | 2021-12-31 | 2022-05-06 | 西安交通大学 | Transformer oil tank deformation monitoring and protecting integrated device and method |
| CN114509705A (en) * | 2021-12-31 | 2022-05-17 | 西安交通大学 | Transformer state monitoring device and method based on strain characteristics of explosion-proof material |
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| CN112635214B (en) | 2022-05-20 |
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Effective date of registration: 20240329 Address after: 101399 5th floor, building 6, courtyard 11, Tengren Road, Niulanshan Town, Shunyi District, Beijing Patentee after: BEIJING ZHONGRUIHE ELECTRICAL Co.,Ltd. Country or region after: China Address before: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee before: XI'AN JIAOTONG University Country or region before: China |