CN106405269A - Dry-type air-core reactor low temperature performance detection method and system - Google Patents
Dry-type air-core reactor low temperature performance detection method and system Download PDFInfo
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- CN106405269A CN106405269A CN201610702593.5A CN201610702593A CN106405269A CN 106405269 A CN106405269 A CN 106405269A CN 201610702593 A CN201610702593 A CN 201610702593A CN 106405269 A CN106405269 A CN 106405269A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
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Abstract
The invention discloses a dry-type air-core reactor low temperature performance detection method. A dry-type air-core reactor test object comprises at least one winding packet. The winding packet comprises a wound wire, an insulating material wound at the external part of the wire and a stress piece arranged between the wire and the insulating material. The detection method comprises the steps of building a connection loop used for performing low temperature performance detection on the dry-type air-core reactor test object, wherein the connection loop comprises a voltage regulator, a test transformer, a high-voltage switch, a compensation capacitor, the dry-type air-core reactor test object and a low-temperature test chamber, the voltage regulator is connected with the test transformer, the high-voltage switch is connected with the test transformer, the compensation capacitor and the dry-type air-core reactor test object so as to from a detection loop, and connection or disconnection of the detection loop is controlled through on or off of the high-voltage switch. According to the invention, a new dry-type air-core reactor is adopted to perform the low temperature performance test, so that a dry-type air-core reactor low temperature performance test can be performed under a condition which is similar to the field environment temperature and running condition.
Description
Technical field
The present invention relates to detection field, more particularly, to a kind of dry-type air-core reactor cryogenic property detection method and
System.
Background technology
Reactor is widely used in T ＆ D Technology field, and wherein dry-type air-core reactor is a kind of important in power system
Reactive-load compensation equipment, prior art produces dry-type air-core reactor, and because its design capacity is big, resistance to shorting impact property is excellent,
Insulation margin is high, is developed rapidly the advantages of on-site maintenance is simple, has covered 10kV～66kV and extra-high-voltage alternating current
Engineering 110kV electric pressure system, maximum individual capacity reaches 40Mvar.The electric current flowing through when dry-type air-core reactor puts into operation is very
Greatly, hundreds of to more than 1,000 amperes are generally reached, for meeting this service condition, dry-type air-core reactor adopts multiple insulation encapsulatings simultaneously
Connection structure, each encapsulating is insulated by monofilament after winding lead or the outside wrapping insulating materials of insulation transposition twisted wire coiling air core coil
Solidification forms.For many years dry reactor operating statistic result is shown, northeastward the fault of regional winter dry reactor occurs
Rate is higher, and the serious accident such as catch fire frequently occurs.But these fault reactance devices are the qualified product of delivery test, this table
Bright existing dry-type air-core reactor test method runs Performance Assessment Shortcomings at low temperature to it.Conventional dry type is empty
The test of core device is to carry out at normal temperatures, and mainly based on electric property examination, but conventional research shows, dry reactor
Insulating materials electric property at low temperature has no significant change it is seen that being to be difficult to look for only by routine test compared with normal temperature state
Go out the high real causes of fault rate under dry-type air-core reactor low temperature it is therefore necessary on the basis of existing test method,
For the feature of dry reactor, the test method proposing the mechanical performance under cryogenic conditions conducts a research, to guarantee product matter
Amount, the operational reliability improving dry reactor under low temperature environment is significant.Prior art is not directed to dry-type hollow
Reactor cryogenic property carries out the research of context of detection.
Content of the invention
In order to solve the above problems, the invention provides a kind of method, a kind of cryogenic property inspection of dry-type air-core reactor
Survey method, described dry-type air-core reactor test product includes the encapsulating of at least one winding, and described winding encapsulating includes：The leading of coiling
Line, in the insulating materials of the outside coiling of described wire, and the stress section arranged between described wire and described insulating materials,
Wherein said stress section is used for measuring the STRESS VARIATION in described encapsulating, and methods described includes：
Set up the connected loop for dry-type air-core reactor test product is carried out with cryogenic property detection, wherein said connection is returned
Road：Pressure regulator, testing transformer, high-voltage switch gear, compensation capacitor, dry-type air-core reactor test product and low-temperature test chamber, institute
State pressure regulator to be connected with described testing transformer, described high-voltage switch gear and described testing transformer, described compensation capacitor and
Described dry-type air-core reactor test product forms measure loop, controls described measure loop by the closure or disconnection of high-voltage switch gear
On or off；
Close described high-voltage switch gear, by adjusting pressure regulator come a liter high voltage, make described dry-type air-core reactor test product
Electric current reaches and carries out the required current value of cryogenic property detection；
Disconnect described high-voltage switch gear, open and adjust described low-temperature test chamber temperature required to carrying out cryogenic property detection
Temperature value, keeps described dry-type air-core reactor test product temperature constant；
Close described high-voltage switch gear, the winding measuring described dry-type air-core reactor test product encapsulates the change of internal stress piece；
And
Disconnect described high-voltage switch gear, described pressure regulator is depressured back to zero, and closes described low-temperature test chamber.
Preferably, wherein said dry-type air-core reactor test product and dry-type air-core reactor finished product wire and insulating materials phase
With.
Preferably, wherein said stress section is evenly arranged between described wire and described insulating materials.
Preferably, the electric current of wherein said dry-type air-core reactor test product is consistent with dry-type air-core reactor finished product electric current.
Based on another embodiment of the invention, the present invention provides a kind of cryogenic property detection system of dry-type air-core reactor
System, described system includes：The cryogenic property detecting system of dry-type air-core reactor test product and dry-type air-core reactor test product is even
Logical loop；
Described dry-type air-core reactor test product includes：At least one winding is encapsulated, and described winding encapsulating includes：The leading of coiling
Line, in the insulating materials of the outside coiling of described wire, and the stress section arranged between described wire and described insulating materials,
Wherein said stress section is used for measuring the STRESS VARIATION in described encapsulating；
Described dry-type air-core reactor test product cryogenic property detecting system connected loop includes：Pressure regulator, testing transformer,
High-voltage switch gear, compensation capacitor, dry-type air-core reactor test product and low-temperature test chamber, described pressure regulator and described test transformation
Device is connected, described high-voltage switch gear and described testing transformer, described compensation capacitor and described dry-type air-core reactor test product
Composition measure loop, by closure or the on or off disconnecting the described measure loop of control of high-voltage switch gear；
Described dry-type air-core reactor test product cryogenic property detecting system is used for：
Close described high-voltage switch gear, by adjusting pressure regulator come a liter high voltage, make described dry-type air-core reactor test product
Electric current reaches and carries out the required current value of cryogenic property detection；
Disconnect described high-voltage switch gear, open and adjust described low-temperature test chamber temperature required to carrying out cryogenic property detection
Temperature value, keeps described dry-type air-core reactor test product temperature constant；
Close described high-voltage switch gear, the winding measuring described dry-type air-core reactor test product encapsulates the change of internal stress piece；
And
Disconnect described high-voltage switch gear, described pressure regulator is depressured back to zero, and closes described low-temperature test chamber.
Preferably, wherein said dry-type air-core reactor test product and dry-type air-core reactor finished product wire and insulating materials phase
With.
Preferably, wherein said stress section is evenly arranged between described wire and described insulating materials.
Preferably, the electric current of wherein said dry-type air-core reactor test product is consistent with dry-type air-core reactor finished product electric current.
Technical scheme proposed by the invention, carries out cold performance test using new dry-type air-core reactor, can achieve
Carry out dry-type air-core reactor cold performance test at the scene under environment temperature and operation conditions similar conditions.Invention design is a kind of
Dry-type air-core reactor test product, to solve existing dry-type air-core reactor volume greatly it is impossible to carry out asking of the low-temperature test of whole machine
Topic.Technical scheme uses stress test device to measure the cryogenic mechanical characteristic of dry-type air-core reactor test product, obtains
Dry-type air-core reactor mechanical property under true cryogenic conditions.
Brief description
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of dry-type air-core reactor cryogenic property detection method flow chart according to an embodiment of the present invention；
Fig. 2 is a kind of dry-type air-core reactor test product winding encapsulating structure figure according to an embodiment of the present invention；And
Fig. 3 is a kind of dry-type air-core reactor cryogenic property detecting system structure according to an embodiment of the present invention.
Specific embodiment
With reference now to accompanying drawing, introduce the illustrative embodiments of the present invention, however, the present invention can be with many different shapes
Formula is implementing, and is not limited to embodiment described herein, provides these embodiments to be at large and fully disclose
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing of being illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon is remembered.
Unless otherwise stated, term (inclusion scientific and technical terminology) used herein has to person of ordinary skill in the field
Common understand implication.Further it will be understood that the term being limited with the dictionary that is usually used is it should be understood to and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is a kind of dry-type air-core reactor cryogenic property detection method flow chart according to an embodiment of the present invention
100.According to the embodiment of the present invention, the present invention designs a kind of dry-type air-core reactor test product, to solve existing dry-type hollow
Reactor finished-product volume is greatly it is impossible to carry out the problem of the low-temperature test of whole machine.A kind of dry-type air-core reactor proposed by the present invention
Cold performance test method, measures the cryogenic mechanical characteristic of dry-type air-core reactor test product using stress test device, obtains true
Dry-type air-core reactor mechanical property under real cryogenic conditions.Preferably, method 100 includes, the dry-type air-core reactor of acquisition
Test product includes the encapsulating of at least one winding, and winding encapsulating includes：The wire of coiling, the insulating materials of coiling outside wire, with
And between wire and insulating materials arrangement stress section, wherein stress section be used for measurement encapsulating in STRESS VARIATION, method bag
Include：Set up the connected loop for dry-type air-core reactor test product is carried out with cryogenic property detection, wherein connected loop：Pressure regulation
Device, testing transformer, high-voltage switch gear, compensation capacitor, dry-type air-core reactor test product and low-temperature test chamber, pressure regulator and examination
Test transformer to be connected, high-voltage switch gear is detected back with testing transformer, compensation capacitor and dry-type air-core reactor test product composition
Road, by closure or the on or off disconnecting control measure loop of high-voltage switch gear.Carry out dry-type air-core reactor test product low
During warm performance detection, stress section measurement line is accessed stress measurement device, dry-type air-core reactor test product is positioned over low temperature examination
In tryoff.Closed high switch, by adjust pressure regulator come a liter high voltage, make the electric current of dry-type air-core reactor test product reach into
The required current value of row cryogenic property detection.Disconnect high-voltage switch gear, open and adjust low-temperature test chamber temperature to carrying out low temperature properties
Required temperature value can be detected, keep dry-type air-core reactor test product temperature constant.Closed high switchs, measurement dry-type hollow electricity
The winding of anti-device test product encapsulates the change of internal stress piece；And disconnection high-voltage switch gear, pressure regulator is depressured back to zero, and closes low
Temperature test box.
Preferably, as shown in figure 1, method 100 is from the beginning of step 101 place.Dry-type air-core reactor proposed by the invention
Test product is composed in parallel by the encapsulating of multiple windings, and winding encapsulating quantity is more than 1.This method is entered to dry-type air-core reactor test product
During row design, encapsulate number with reference to finished product winding, the part encapsulating quantity from finished product winding is tried as dry-type air-core reactor
Product winding encapsulates number, and makes the current density that each winding is encapsulated equal with finished product winding encapsulating current density, makes detection side
Method is consistent with operation conditions.Wire is set in the winding encapsulating of dry-type air-core reactor test product, wire is plain conductor,
Such as aluminum conductor.It is provided with insulating materials outside wire, in winding encapsulating winding process, stress section is embedded in wire with outward
Between portion's insulating materials, stress section is used for the STRESS VARIATION in measurement encapsulating, by normal process in outside coiling insulating materials simultaneously
Solidification completes winding encapsulating and makes, and insulating materials can be epoxy fibreglass.Dry-type air-core reactor finished product is in low temperature environment
Put into operation, in the presence of through-flow electrodynamic impact and steady too current heating, due to the expansion system of wire and insulating materials
Number is different, and the aluminum conductor in winding package and insulating materials, it may happen that displacement loosens, seriously can affect the cracking of winding encapsulating,
Lead to external humidification to immerse, progressively develop into fault.
The method for designing of dry-type air-core reactor test product and the volume employing grade ratio unit of finished product, dry-type air-core reactor tries
Product are identical with the wire of finished product, insulating materials.Dry-type air-core reactor test product is in operation as making each winding load balancing, electric current
It is the key parameter on the impact of dry-type air-core reactor test product performance parameter, in embodiments of the present invention, each winding is encapsulated
On current density substantially coincident.Dry-type air-core reactor, as inactivity compensation equipment, needs according to System Reactive Power
Change and frequent switching operation.
Preferably, stress section is evenly arranged between wire and insulating materials.Stress section is along dry-type air-core reactor test product
Axially and radially it is evenly arranged in wire outer surface, measurement signal line is drawn through end.
Preferably, when carrying out the detection of dry-type air-core reactor test product cryogenic property, closed high switch first, by adjusting
Whole pressure regulator carrys out a liter high voltage, so that the electric current of dry-type air-core reactor test product is reached and carries out the required electric current of cryogenic property detection
Value.It is then turned off high-voltage switch gear, open and adjust low-temperature test chamber temperature to carrying out the required temperature value of cryogenic property detection, examine
Surveying required temperature value should be basically identical with live low temperature environment temperature value.Keep dry-type air-core reactor test product temperature constant.
Closed high switch again, the winding of measurement dry-type air-core reactor test product encapsulates the change of internal stress piece, and, finally disconnect
High-voltage switch gear, and close low-temperature test chamber, terminate test.By embodiments of the present invention so that dry-type air-core reactor
Test product can be detected at low ambient temperatures, obtains dry-type air-core reactor mechanical performance parameter at low ambient temperatures,
There is provided reference for improving and optimizing dry-type air-core reactor material and production technology art, reduce dry-type air-core reactor in low temperature ring
Rate of breakdown under border, improves dry-type air-core reactor reliability of operation.
Fig. 2 is a kind of dry-type air-core reactor test product winding encapsulating structure figure according to an embodiment of the present invention.Preferably
Ground, dry-type air-core reactor test product proposed by the invention is composed in parallel by multiple windings encapsulating 200, and winding encapsulates 200 quantity
For more than 1.When this method is designed to dry-type air-core reactor test product winding encapsulating 200, encapsulate number with reference to finished product winding,
The part encapsulating quantity from finished product winding encapsulates number as dry-type air-core reactor test product winding, and so that each winding is encapsulated
On current density and finished product winding encapsulating current density equal, so that detection method is consistent with operation conditions.Empty in dry type
Setting wire 201 in the winding encapsulating 200 of core device test product, wire 201 is plain conductor, such as aluminum conductor.Outside wire
Be provided with insulating materials, encapsulate in 200 winding process in winding, by stress section 202 be embedded in wire and exterior insulation material it
Between, stress section is evenly arranged between wire and insulating materials.Stress section 202 is used for the STRESS VARIATION in measurement encapsulating, by just
Often technique in outside coiling insulating materials 203 and solidifies and completes winding encapsulating and make.Insulating materials is epoxy fibreglass.Dry type is empty
Core device test product is identical with dry-type air-core reactor finished product wire and insulating materials.The making of dry-type air-core reactor test product with
Dry-type air-core reactor finished product is designed by the way of waiting than unit, dry-type air-core reactor finished product and dry-type hollow reactance
The ratio range of the volume ratio of device test product is 2 to 15.
Fig. 3 is a kind of system construction drawing of the dry-type air-core reactor cryogenic property detection according to an embodiment of the present invention
300.Set up the system construction drawing 300 for dry-type air-core reactor test product is carried out with cryogenic property detection, wherein connected loop：
Pressure regulator 301, testing transformer 302, high-voltage switch gear 303, compensation capacitor 304, dry-type air-core reactor test product 305 and low
Temperature test box 306, pressure regulator 301 is connected with testing transformer 302, high-voltage switch gear 303 and testing transformer 302, compensating electric capacity
Device 304 and dry-type air-core reactor test product test product 305 composition measure loop, by closure or the disconnection control of high-voltage switch gear 303
The on or off of measure loop processed.When carrying out the detection of dry-type air-core reactor test product 305 cryogenic property, stress section is measured line
Access stress measurement device, dry-type air-core reactor test product 305 is positioned in low-temperature test chamber 306.Experiment power supply is by testing
Transformer 302 provides, because dry-type air-core reactor test product 305 capacity is larger, in embodiments of the present invention, electric using compensating
The power supply capacity needed for method minimizing of container 304 shunt compensation.First closed high switch 303, by adjust pressure regulator 301
Rise high voltage, so that the electric current of dry-type air-core reactor test product 305 is reached and carry out the required current value of cryogenic property detection.Disconnect high
Compress switch 303, open and adjust low-temperature test chamber temperature 306 to carrying out the required temperature value of cryogenic property detection, and can protect
Hold dry-type air-core reactor test product 305 temperature constant.The required temperature value of detection should with dry-type air-core reactor finished product actual fortune
The low temperature environment temperature value of row is consistent.Closed high switch 303, in the winding encapsulating of measurement dry-type air-core reactor test product 305
The change of stress section.And disconnect high-voltage switch gear 303, pressure regulator 301 is depressured back to zero and closes low-temperature test chamber, terminate examination
Test.
Technical scheme proposed by the invention, carries out cold performance test using new dry-type air-core reactor test product, can
Realize carrying out dry-type air-core reactor cold performance test under environment temperature and operation conditions similar conditions at the scene.Invention design
A kind of dry-type air-core reactor test product, to solve existing dry-type air-core reactor finished-product volume greatly it is impossible to carry out the low temperature of whole machine
The problem of test.Technical scheme uses stress test device to measure the cryogenic mechanical spy of dry-type air-core reactor test product
Property, obtain the dry-type air-core reactor mechanical property under true cryogenic conditions.The technical scheme that the present invention provides is used for reducing dry
Formula air reactor rate of breakdown at low ambient temperatures, for improving and optimizing dry-type air-core reactor material and production technology art
Reference is provided, improves dry-type air-core reactor reliability of operation.
The present invention is described by reference to a small amount of embodiment.However, known in those skilled in the art, as
Subsidiary Patent right requirement is limited, except present invention others disclosed above embodiment equally falls the present invention's
In the range of.
Normally, all terms using in the claims are all solved in the usual implication of technical field according to them
Release, unless in addition clearly defined wherein.All of reference "/described/be somebody's turn to do [device, assembly etc.] " is all opened ground
It is construed at least one of described device, assembly etc. example, unless otherwise expressly specified.Any method disclosed herein
Step all need not be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (8)
1. the cryogenic property detection method of a kind of dry-type air-core reactor,
Described dry-type air-core reactor test product includes the encapsulating of at least one winding, and described winding encapsulating includes：The wire of coiling,
The insulating materials of the outside coiling of described wire, and the stress section arranged between described wire and described insulating materials, wherein
Described stress section is used for measuring the STRESS VARIATION in described encapsulating, and methods described includes：
Set up the connected loop for dry-type air-core reactor test product is carried out with cryogenic property detection, wherein said connected loop：
Pressure regulator, testing transformer, high-voltage switch gear, compensation capacitor, dry-type air-core reactor test product and low-temperature test chamber, described tune
Depressor is connected with described testing transformer, described high-voltage switch gear and described testing transformer, described compensation capacitor and described
Dry-type air-core reactor test product forms measure loop, by closure or the conducting disconnecting the described measure loop of control of high-voltage switch gear
Or cut-off；
Close described high-voltage switch gear, by adjusting pressure regulator come a liter high voltage, make the electric current of described dry-type air-core reactor test product
Reach and carry out the required current value of cryogenic property detection；
Disconnect described high-voltage switch gear, open and adjust described low-temperature test chamber temperature to the temperature carrying out needed for cryogenic property detection
Value, keeps described dry-type air-core reactor test product temperature constant；
Close described high-voltage switch gear, the winding measuring described dry-type air-core reactor test product encapsulates the change of internal stress piece；And
Disconnect described high-voltage switch gear, described pressure regulator is depressured back to zero, and closes described low-temperature test chamber.
2. method according to claim 1, wherein said dry-type air-core reactor test product and dry-type air-core reactor finished product
Wire is identical with insulating materials.
3. method according to claim 1, wherein said stress section is uniform between described wire and described insulating materials
Arrangement.
4. method according to claim 1, the electric current of wherein said dry-type air-core reactor test product and dry-type hollow reactance
Device finished product electric current is consistent.
5. the cryogenic property detecting system of a kind of dry-type air-core reactor, described system includes：Dry-type air-core reactor test product with
And the cryogenic property detecting system connected loop of dry-type air-core reactor test product；
Described dry-type air-core reactor test product includes：At least one winding is encapsulated, and described winding encapsulating includes：The wire of coiling,
In the insulating materials of the outside coiling of described wire, and the stress section arranged between described wire and described insulating materials, its
Described in stress section be used for measure described encapsulating in STRESS VARIATION；
Described dry-type air-core reactor test product cryogenic property detecting system connected loop includes：Pressure regulator, testing transformer, high pressure
Switch, compensation capacitor, dry-type air-core reactor test product and low-temperature test chamber, described pressure regulator and described testing transformer phase
Even, described high-voltage switch gear and described testing transformer, described compensation capacitor and described dry-type air-core reactor test product composition
Measure loop, by closure or the on or off disconnecting the described measure loop of control of high-voltage switch gear；
Described dry-type air-core reactor test product cryogenic property detecting system is used for：
Close described high-voltage switch gear, by adjusting pressure regulator come a liter high voltage, make the electric current of described dry-type air-core reactor test product
Reach and carry out the required current value of cryogenic property detection；
Disconnect described high-voltage switch gear, open and adjust described low-temperature test chamber temperature to the temperature carrying out needed for cryogenic property detection
Value, keeps described dry-type air-core reactor test product temperature constant；
Close described high-voltage switch gear, the winding measuring described dry-type air-core reactor test product encapsulates the change of internal stress piece；And
Disconnect described high-voltage switch gear, described pressure regulator is depressured back to zero, and closes described low-temperature test chamber.
6. system according to claim 5, wherein said dry-type air-core reactor test product and dry-type air-core reactor finished product
Wire is identical with insulating materials.
7. system according to claim 5, wherein said stress section is uniform between described wire and described insulating materials
Arrangement.
8. system according to claim 5, the electric current of wherein said dry-type air-core reactor test product and dry-type hollow reactance
Device finished product electric current is consistent.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931715A (en) * | 2018-07-17 | 2018-12-04 | 哈尔滨理工大学 | A kind of test method that reactor turn-to-turn insulation is influenced by temperature changing stress and device |
| CN109342892A (en) * | 2018-08-24 | 2019-02-15 | 天津经纬正能电气设备有限公司 | The test method of dry-type air-core reactor air duct slats insulation performance |
| CN110068752A (en) * | 2019-04-29 | 2019-07-30 | 国网吉林省电力有限公司电力科学研究院 | Dry type hollow shunt reactor low temperature is through-flow simulated testing system and its test method |
| CN111289824A (en) * | 2020-03-05 | 2020-06-16 | 国网吉林省电力有限公司电力科学研究院 | Strain temperature characteristic detection method for dry-type air-core reactor |
| CN111929516A (en) * | 2020-06-30 | 2020-11-13 | 国网黑龙江省电力有限公司电力科学研究院 | Reactor low-temperature resistance detection system and detection method based on optical fiber sensor |
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| CN111929516A (en) * | 2020-06-30 | 2020-11-13 | 国网黑龙江省电力有限公司电力科学研究院 | Reactor low-temperature resistance detection system and detection method based on optical fiber sensor |
| CN111929516B (en) * | 2020-06-30 | 2024-04-26 | 国网黑龙江省电力有限公司电力科学研究院 | Reactor low temperature resistance detection system and method based on optical fiber sensor |
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