CN106841892A - Grounding transformer fault detection method and device - Google Patents
Grounding transformer fault detection method and device Download PDFInfo
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- CN106841892A CN106841892A CN201611142024.6A CN201611142024A CN106841892A CN 106841892 A CN106841892 A CN 106841892A CN 201611142024 A CN201611142024 A CN 201611142024A CN 106841892 A CN106841892 A CN 106841892A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention discloses a kind of grounding transformer fault detection method and device.Wherein, the method includes：Grounding transformer to breaking down carries out analysis of experiments and disassembling analysis, obtain analysis result, wherein, analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, and disassembling analysis include coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process analysis of the grounding transformer for breaking down；And the reason that breaks down of the grounding transformer broken down according to analysis result analysis.The failure cause that the present invention solves in correlation technique for the grounding transformer for breaking down detects inaccurate technical problem.
Description
Technical field
The present invention relates to power domain, in particular to a kind of grounding transformer fault detection method and device.
Background technology
Grounding transformer is widely used in transformer station, and grounding transformer breaks down will cause substation fault.Mesh
Before, in order to effectively reduce number of times that grounding transformer breaks down, it is necessary to the reason for being broken down to grounding transformer is divided
Analysis, in order to take corresponding preventative strategies according to analysis result, effectively breaking down for grounding transformer is prevented to reach.But
That the failure cause detection in correlation technique for the grounding transformer that breaks down is inaccurate, will so cause according to
The preventative strategies formulated according to analysis result are not accurate enough, and will be unable to reach prevents grounding transformer from breaking down.
Inaccurate problem is detected for the failure cause in correlation technique for the grounding transformer for breaking down, at present
Not yet propose effective solution.
The content of the invention
A kind of grounding transformer fault detection method and device are the embodiment of the invention provides, at least to solve correlation technique
In detect inaccurate technical problem for the failure cause of grounding transformer for breaking down.
A kind of one side according to embodiments of the present invention, there is provided grounding transformer fault detection method, including：To hair
The grounding transformer of raw failure carries out analysis of experiments and disassembling analysis, obtains analysis result, wherein, analysis of experiments includes event
The Insulation Test of the grounding transformer of barrier and D.C. resistance are tested, and disassembling analysis include the line of the grounding transformer for breaking down
Circle turn-to-turn short circuit analysis, spark location analysis and short-circuit process analysis；And broken down according to analysis result analysis
The reason that breaks down of grounding transformer.
Further, carrying out analysis of experiments to the grounding transformer for breaking down includes：The ground connection that detection is broken down becomes
Depressor it is on high-tension side it is alternate, over the ground and low-pressure side it is alternate, over the ground with the presence or absence of effectively insulation；The ground connection that measurement is broken down
The inside and outside winding of each phase iron core of transformer.
Further, carrying out disassembling analysis to the grounding transformer for breaking down includes：The ground connection that detection is broken down becomes
The outer layer Y windings of the B phase iron cores of depressor determine turn-to-turn short circuit original position；The iron yoke of the grounding transformer for breaking down is pulled down
Check and determine failure coil to iron yoke and the spark tracking of iron core；The B phase coils of the grounding transformer that detection is broken down
Charing situation.
Further, the reason that breaks down of the grounding transformer for being broken down according to analysis result analysis includes：According to
The analysis result of disassembling analysis determines that the outer layer Y windings inside of the B iron core columns of the grounding transformer for breaking down occurs turn-to-turn, layer
Between short trouble.
Further, the reason that breaks down of the grounding transformer for being broken down according to analysis result analysis includes：According to
The analysis result of disassembling analysis determines that the outer layer Y windings inside of the B iron core columns of the grounding transformer for breaking down occurs turn-to-turn, layer
Between short trouble.
Another aspect according to embodiments of the present invention, additionally provides a kind of grounding transformer failure detector, including：Examination
Solution body unit is tested, for carrying out analysis of experiments and disassembling analysis to the grounding transformer for breaking down, analysis result is obtained, its
In, analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, and disassembling analysis include hair
Coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process analysis of the grounding transformer of raw failure；And failure
Analytic unit, the reason that breaks down of the grounding transformer for being broken down according to analysis result analysis.
Further, experiment solution body unit includes：First detection module is high for detecting the grounding transformer for breaking down
Pressure side it is alternate, over the ground and low-pressure side it is alternate, over the ground with the presence or absence of effectively insulation；, there is event for measuring in measurement module
The inside and outside winding of each phase iron core of the grounding transformer of barrier.
Further, experiment solution body unit includes：Second detection module, for detecting the grounding transformer for breaking down
The outer layer Y windings of B phase iron cores determine turn-to-turn short circuit original position；First determining module, for the ground connection transformation that will be broken down
The iron yoke of device is pulled down to be carried out checking determination failure coil to iron yoke and the spark tracking of iron core；3rd detection module, for detecting
The charing situation of the B phase coils of the grounding transformer for breaking down.
Further, accident analysis unit includes：Second determining module, for being determined according to the analysis result of disassembling analysis
There is turn-to-turn, layer short circuit failure in the outer layer Y windings inside of the B iron core columns of the grounding transformer for breaking down.
Further, device also includes：Determining unit, in the ground connection transformation broken down according to analysis result analysis
After the reason that breaks down of device, trouble-saving strategy is determined according to failure cause, wherein, trouble-saving strategy is used to prevent from connecing
Ground transformer breaks down, and trouble-saving strategy includes at least one of：Improve the Flame Retardancy of grounding transformer；Docking
Ground transformer carries out fault simulating test；Determine the optimal mode of connection of grounding transformer.
In embodiments of the present invention, analysis of experiments and disassembling analysis are carried out by the grounding transformer for breaking down, is obtained
To analysis result, wherein, analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, solution
Body analysis includes coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process point of the grounding transformer for breaking down
Analysis；And the reason that breaks down of the grounding transformer broken down according to analysis result analysis, reach accurate detection ground connection
The purpose of the reason for transformer breaks down, and then solve the failure in correlation technique for the grounding transformer for breaking down
Reason detects inaccurate technical problem, it is achieved thereby that improving the technology effect of grounding transformer failure cause Detection accuracy
Really.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of grounding transformer fault detection method according to embodiments of the present invention；And
Fig. 2 is the schematic diagram of grounding transformer failure detector according to embodiments of the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of present invention protection
Enclose.
It should be noted that term " first ", " in description and claims of this specification and above-mentioned accompanying drawing
Two " it is etc. for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or other intrinsic steps of equipment or unit.
According to embodiments of the present invention, there is provided a kind of embodiment of the method for grounding transformer fault detection method is, it is necessary to say
It is bright, can be held in the such as one group computer system of computer executable instructions the step of the flow of accompanying drawing is illustrated
OK, and, although show logical order in flow charts, but in some cases, can be with different from order herein
Perform shown or described step.
Fig. 1 is the flow chart of grounding transformer fault detection method according to embodiments of the present invention, as shown in figure 1, the party
Method comprises the following steps：
Step S102, the grounding transformer to breaking down carries out analysis of experiments and disassembling analysis, obtains analysis result, its
In, analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, and disassembling analysis include hair
Coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process analysis of the grounding transformer of raw failure；
Step S104, the reason that breaks down of the grounding transformer broken down according to analysis result analysis.
By above-mentioned steps, it is possible to achieve the purpose of the reason for accurate detection grounding transformer breaks down, and then solve
Failure cause in correlation technique for the grounding transformer for breaking down detects inaccurate technical problem, it is achieved thereby that
Improve the technique effect of grounding transformer failure cause Detection accuracy.
Used as a kind of alternatively embodiment, the grounding transformer to breaking down carries out analysis of experiments to be included：Detection occurs
The grounding transformer of failure it is on high-tension side it is alternate, over the ground and low-pressure side it is alternate, over the ground with the presence or absence of effectively insulation；Measurement hair
The inside and outside winding of each phase iron core of the grounding transformer of raw failure.
Used as a kind of alternatively embodiment, the grounding transformer to breaking down carries out disassembling analysis to be included：Detection occurs
The outer layer Y windings of the B phase iron cores of the grounding transformer of failure determine turn-to-turn short circuit original position；By the ground connection transformation for breaking down
The iron yoke of device is pulled down to be carried out checking determination failure coil to iron yoke and the spark tracking of iron core；The ground connection transformation that detection is broken down
The charing situation of the B phase coils of device.
As a kind of alternatively embodiment, the original that breaks down of the grounding transformer broken down according to analysis result analysis
Because including：Analysis result according to disassembling analysis is determined inside the outer layer Y windings of the B iron core columns of the grounding transformer for breaking down
Generation turn-to-turn, layer short circuit failure.
As a kind of alternatively embodiment, in breaking down for the grounding transformer broken down according to analysis result analysis
After reason, method also includes：Trouble-saving strategy is determined according to failure cause, wherein, trouble-saving strategy is used to prevent from connecing
Ground transformer breaks down, and trouble-saving strategy includes at least one of：Improve the Flame Retardancy of grounding transformer；Docking
Ground transformer carries out fault simulating test；Determine the optimal mode of connection of grounding transformer.
The present invention also provides a kind of preferred embodiment, in the preferred embodiment, transformation is grounded with 110kV Suzhou street station 1#
It is specifically described as a example by device accident analysis.
Failure basic condition
Failure overview
56 points during 25 days 21 October in 2015,110kV Suzhou street transformer station 1# transformer differential protection acts, 1# transformers 101
Switch and 10kV 3# bus 201A, 201B switch motion breakings, the switch of 10kV mothers 234,263 are hauled oneself willingly into successfully, and 1# becomes complete
Portion's load is taken out of by 234,263 switches, without loss load.58 points of Suzhou street station fire protection warning host activity alarm when 21, warp
Operation maintenance personnel verification 1# main transformer 10kV sides 1# grounding transformer failures are on fire, and 10 points carry out fire-fighting work when 22.
Fault in-situ situation
The unit technical staff such as company's fortune inspection portion, fortune inspection portion of Haidian company, DianKeYuan rushes towards scene first after failure generation
Time reconnoitres failure situation, and DianKeYuan has transferred Fault Recorder Information simultaneously.
Field condition after the completion of fire-fighting work：Failure 1# grounding transformer B phase coils top produces naked light, top about 1/
4 part surface epoxide resin materials have burnt shortcake, and the glass fiber mesh in epoxy resin is exposed outside；Other two-phases are risen by B phases
Fire influence has part burn traces, but has no obvious original point of origin.B phase coils have obvious glass at low-pressure side scaling loss position
Web breaks, bulge vestige, are that obvious internal heat gathers the phenomenon that shell bursts apart.
The back side (high-voltage connecting line side) of B phase coils, it is seen that its peripheral same scaling loss of epoxy insulation material is serious, while in B
Phase joint and neutral point joint left part find crackle.
The connection bolt that ground connection becomes three-phase high-voltage side line ring has electric discharge phenomena, and bolt surface has the situation of partial melting.
110kV Suzhou street station ruuning situation and 1# grounding transformer facility informations
(1) 110kV Suzhou street station ruuning situation
110kV Suzhou street transformer station starts capital construction in December, 2003, and September in 2004 builds up generating on the 19th, and (2#, 3# are changed into
First stage of the project), No. 16 enlargings of in June, 2010 generate electricity (1#, 4# are changed into the second stage of the project), and the 110kV modes of connection are sectionalized single busbar connection
Wiring, the 10kV modes of connection are the belt wiring of the segmentation of single busbar 8, are semi-subterranean substation.
10kV 3#A and 3#B bus are switched by 1#110kV transformer-supplieds, 1# ground connection through 201A and 201B before failure occurs
Transformer connection meets place in 201A and 201B switch leads T.
(2) 1# grounding transformers facility information
Failure 1# grounding transformers are epoxy resins insulation type dry-type transformer, and its coil uses polyester-imide enamel covered wire
Carry out turn-to-turn insulation.Beijing Electrical Equipment Factory's in October, 2009 produces, and in June, 2010 puts into operation, model DSBC-315/
10.5, rated capacity 315kVA.
Unit faults recorder analysis
Fault Recorder Information：There is voltage decline phenomenon and (are down to first in 56 points 46 seconds when 21,10kV 3# bus B phases
0.51kV, the value is the virtual value of a cycle after the blue left vernier of event recording software), slightly swashing occur in A phases and C phase voltages
Increase, the phenomenon is obvious single-phase earthing phenomenon.Three-phase voltage declines simultaneously after 3ms is understood from failure wave-recording, while 101 is disconnected
Road device three-phase current increases sharply, and the phenomenon is obvious three-phase shortcircuit situation.Therefore, from unit faults recorder analysis, break down
Moment B phase occur at first ground connection, three-phase shortcircuit is developed into after 3ms.
Understood through consequent malfunction analysis, 1# grounding transformer B phases high-voltage connection terminals connect with zero sequence first during failure starting
Electric arc is produced to cause of short duration ground connection between line terminals, the electric arc lighted quickly grows after 3ms, causes three-phase shortcircuit.By failure
Wave-record chart understands that breaker A, B, C the three-phase secondary current of 1# main transformer 110kV high-pressure sides 101 is respectively when failure occurs
2.151A, 2.070A, 2.197A, the difference with 10kV low-pressure side 201A, 201B breaker secondary current sums are about 2A (three-phases
Respectively 0.140A, 0.101A, 0.153A), more than differential protection operating valve value 0.26A, therefore 1# transform er differential protections are normal
Action, 1# main transformer breakings.Detailed failure reason analysis will hereinafter continue to illustrate.
Experiment and disassembling analysis
On October 27th, 2015, fortune inspection portion of company, fortune inspection portion of Haidian company, DianKeYuan, Beijing Electrical Equipment Factory are in electricity
Institute of section is tested fault ground transformer and disassembling analysis jointly.Hereafter will be to result of the test, mainly disintegration process, failure
Phenomenon is described, and failure cause and anomaly Producing reason are analyzed.
Analysis of experiments
1st, the transformer insulated experiment of fault ground：
Due to fault ground, to become the covering of surface carbon serious, therefore finds that ground connection becomes on high-tension side alternate, over the ground in experiment,
And low-pressure side it is alternate, over the ground without effectively insulation, therefore pressure test cannot be carried out.
2nd, fault ground DC Resistance Test of Transformer：
(1) fault ground transformer coil wiring is introduced
110kV Suzhou street transformer station 1# ground connection is changed into ZN type transformers, is made up of two parts per phase winding, rotating around not
On same core limb, due to the same phase of zero-sequence current that A, B, C three-phase are provided, two concentric windings constitute ampere-turns conversely, therefore per phase
Zero sequence magnetomotive force be almost equal to zero.
Needing emphasis to describe the model grounding transformer each iron core has two sections of high pressure windings, is divided into inside and outside two-layer.
By taking B phases as an example, its outer coil is Y windings, and Y windings are connected in wiring with C phase internal layer windings；B phases inner coil is B phases
The upper semisection of winding, its lower semisection X windings are then located at A phases outer coil unshakable in one's determination.Therefore, to each phase in D.C. resistance experiment
Inside and outside winding unshakable in one's determination is measured respectively.
(2) test result
From test result, the B phases B windings unshakable in one's determination winding test value unshakable in one's determination with the more other two-phase of Y windings is wound in
It is less than normal more, therefore judge there is turn-to-turn and layer short circuit inside B, Y winding, cause DC resistance less than normal, with phenomenon of the failure
Meet.
Table 1：Each winding D.C. resistance test result of 1# grounding transformers
Disassembling analysis
1st, coil turn-to-turn short circuit and scaling loss situation
Its glass outer fiber reinforcing mat exposes to be checked to B phases outer layer Y windings unshakable in one's determination before disintegrating, other insulation
Material has been presented powdered, can push aside easily.The electric discharge of winding inner lead is serious, and winding has many places disconnection layer and with high temperature
The molten copper phenomenon that electric discharge is produced, therefore judge to be herein turn-to-turn short circuit section start.
Checked after fault ground iron yoke on transformer is pulled down, top iron yoke and iron core column have ablation trace because of high temperature
Mark, but do not find coil to iron yoke and the spark tracking of iron core.
It is checked after B phase coils are hung out.Pushed aside one by one to copper coil from the charred portion of abort situation and melted down
All expose part, it is seen that outer layer Y winding inter-turns and interlayer there are many places to discharge, break point, and have the molten copper cavity of large area；Pass through
Check that inside does not find that inner layer B winding has substantially electric discharge broken string phenomenon, dimension infers that the reduction of inner layer B winding D.C. resistance should be carbon
Caused by element influence.By disassembling analysis, confirm that abort situation occurs turn-to-turn, layer short circuit for the outer layer Y windings inside of B core limbs
Failure.
2nd, spark location and short-circuit process are analyzed
Solution body running in starting over the ground spark location found one by one, first, do not find failure coil to iron yoke,
There are obvious electric discharge phenomena over the ground in unshakable in one's determination and other positions；Again, three-phase terminal screw has serious scorification at high-voltage connection
Phenomenon, combination failure wave-record chart is deduced, its discharge process should be B connect line end first centering point terminals occur electricity
Arc discharge, electric arc quickly grows, and other two-phase high-voltage terminal is same after 3ms produces electric arc to zero sequence terminals, causes three-phase
Ground short circuit.
The analysis of causes
1# grounding transformer failure reason analysis
Fault ground transformer body winding in the process of running B phases Y winding epimeres coil occur turn-to-turn and interlayer it is short
Road, the coil temperature of layer short circuit significantly rises, and causes the epoxy insulation material of surrounding to decompose, and produces fuel gas；It is flammable
Gas catching fire in the presence of coil interlayer short circuiting arc, and discharge substantial amounts of carbon.Influenceed by flame and carbon,
Dielectric level between high-voltage terminal declines, and causes B phases high-voltage connection that arc discharge occurs to B phase windings neutral point first；
Electric arc quickly grows, and the high-voltage terminal of other two phase winding is same after 3ms produces electric arc to zero sequence terminals, causes three to connect
Ground short circuit.Because coil temperature is still higher, the fuel gas for continuing to produce makes fire endurance period, and staff reaches the spot laggard
Row extinguishing operation.
1# main transformer differential protections action reason is analyzed
This ground connection becomes three-phase ground short trouble and causes 1# main transformers differential protection to act, and its reason is revived for 110kV
The T that station 1# ground connection changes in state street are connected to 10kV 201A, 201B switch leads meets place, the grounding transformer in system wiring mode
In the range of 1# main transformer differential protections.
From Fault Recorder Information, breaker A, B, C three-phase of 1# main transformer 110kV high-pressure sides 101 is secondary when failure occurs
Electric current is respectively 2.151A, 2.070A, 2.197A, the difference with 10kV low-pressure side 201A, 201B breaker secondary current sums
About 2A (three-phase is respectively 0.140A, 0.101A, 0.153A), more than differential protection operating valve value 0.26A, therefore 1# main transformers are poor
Dynamic protection regular event, 1# main transformer breakings.
1# grounding transformers turn-to-turn and the layer short circuit analysis of causes
There are insulation weak defects in the body winding of this fault ground transformer.May cause to lack in the stage of manufacturing
Falling into the link for occurring mainly has two aspects：One is occur bag paint uneven thickness in the production process of insulating lacquer layer, very
To not enough situation；Two is there is problem in the production process of coil winding, causes the insulated paint of coil surface to sustain damage,
Cause turn-to-turn insulation weak defects.
Learnt by the understanding to Beijing Electrical Equipment Factory's production procedure, enamel-covered wire delivery test is qualified, total in equipment
Factory carries out the turn-to-turn pressure test of 3kV, the coil winding production link of next step of being allowed for access after pass the test after buying.Simultaneously
Investigation apparatus head factory was occurred without other failure situations in recent years using the dry type equipment with batch enamel-covered wire.Therefore, polyester is excluded
There is problem in the production process of imines enamel-covered wire, that is, think that the inter-turn insulation of this fault ground transformer results from coil
The process of coiling, judges that Beijing Electrical Equipment Factory has asking for production technology deficiency in the production process of the faulty equipment
Topic.
Analyze in sum, this time failure cause is summarized as follows：
Failure 1# grounding transformer body coils, because production technology deficiency has Insulation Problems, cause circle in winding process
Between and layer short circuit；
Failure 1# grounding transformer fire proofings performance is not enough, and short circuit in winding causes epoxy resin to occur larger after bursting apart
Fiery phenomenon；
Generation is on fire rear and discharging a large amount of carbons declines the dielectric level between 1# grounding transformer high-voltage terminals, enters
And cause A, B, C three-phase terminal centering point terminals that arc discharge occurs, cause three-phase ground short circuit.
In system wiring mode in the range of 1# transform er differential protections, fault current makes 1# main transformers to 1# grounding transformers
High and low pressure side current differential reaches differential protection definite value, therefore differential protection is operating normally, 1# main transformer breakings.
By above-mentioned disassembling analysis, 110kV Suzhou street station 1# transform er differential protections action reason be 1# grounding transformers because
Coil turn-to-turn, layer short circuit generation are on fire, cause and produced at high-voltage connection electric arc to be developed to three-phase ground short circuit.Because the ground connection
Transformer is in the mode of connection in the range of differential protection, and it is differential that fault current reaches 1# main transformer high and low pressure side current differentials
Protection definite value, causes differential protection to be operating normally, 1# main transformer breakings.
Next step measure
1st, for dry type equipment, each O＆M unit is combined makes an inspection tour work development infrared temperature work, and records temperature-measuring results,
Thermometric comparison work is carried out, discovery has growth trend to arrange the inspection that has a power failure in time, it is ensured that dry type equipment safety operation；
2nd, dry type equipment and materials Study of flame retardancy is strengthened.It is responsible for contacting national chemical materials research in Beijing Electrical Equipment Factory
Institute is tested the fire resistance of its epoxy resin insulation material；The follow-up same insulation class for Beijing Electrical Equipment Factory
Type equipment is carried out further investigation and is collected evidence.
3rd, the fault simulating test that dry type equipment artificially presets defect is carried out.Coordinate Beijing Electrical Equipment Factory and manufacture one
The equipment of artificial default defect, the evolution of its short-circuit burning by test simulation, assessment dry type equipment is deposited in the stage of dispatching from the factory
In the actual operating mode of tiny flaw.
4th, the wiring position that investigation ground connection becomes.Research ground connection becomes by bus special switch or is connected on main transformer and opens to 10kV master
The T of pass connects the difference at lead, analyzes and investigate the optimal mode of connection, and safeguards system is stablized and lifts maintenance work effect.
According to embodiments of the present invention, additionally provide a kind of device embodiment of grounding transformer failure detector, it is necessary to
Illustrate, the grounding transformer failure inspection that the grounding transformer failure detector can be used for performing in the embodiment of the present invention
Survey method, the grounding transformer fault detection method in the embodiment of the present invention can be in the grounding transformer failure detector
Perform.
Fig. 2 is the schematic diagram of grounding transformer failure detector according to embodiments of the present invention, as shown in Fig. 2 the dress
Putting to include：
Experiment solution body unit 22, for carrying out analysis of experiments and disassembling analysis to the grounding transformer for breaking down, obtains
Analysis result, wherein, analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, disintegrates
Analysis includes coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process point of the grounding transformer for breaking down
Analysis；And accident analysis unit 24, the reason that breaks down of the grounding transformer for being broken down according to analysis result analysis.
It should be noted that the experiment solution body unit 22 in the embodiment can be used for performing the step in the embodiment of the present application
Rapid S102, the accident analysis unit 24 in the embodiment can be used for performing the step S104 in the embodiment of the present application.Above-mentioned mould
Block is identical with example and application scenarios that the step of correspondence is realized, but is not limited to above-described embodiment disclosure of that.
Alternatively, experiment solution body unit includes：First detection module, for detecting the grounding transformer high pressure for breaking down
Side it is alternate, over the ground and low-pressure side it is alternate, over the ground with the presence or absence of effectively insulation；Measurement module, breaks down for measuring
Grounding transformer each phase iron core inside and outside winding.
Alternatively, experiment solution body unit includes：Second detection module, the B for detecting the grounding transformer for breaking down
The outer layer Y windings of phase iron core determine turn-to-turn short circuit original position；First determining module, for by the grounding transformer for breaking down
Iron yoke pull down carry out check determine failure coil to iron yoke and the spark tracking of iron core；3rd detection module, sends out for detecting
The charing situation of the B phase coils of the grounding transformer of raw failure.
Alternatively, accident analysis unit includes：Second determining module, for being determined to send out according to the analysis result of disassembling analysis
There is turn-to-turn, layer short circuit failure in the outer layer Y windings inside of the B iron core columns of the grounding transformer of raw failure.
Alternatively, device also includes：Determining unit, in the grounding transformer broken down according to analysis result analysis
The reason that breaks down after, trouble-saving strategy is determined according to failure cause, wherein, trouble-saving strategy be used for prevent ground connection
Transformer breaks down, and trouble-saving strategy includes at least one of：Improve the Flame Retardancy of grounding transformer；To ground connection
Transformer carries out fault simulating test；Determine the optimal mode of connection of grounding transformer.
By said units and module, purpose the reason for accurate detection grounding transformer breaks down is reached, and then
Solve the failure cause in correlation technique for the grounding transformer for breaking down and detect inaccurate technical problem, so that real
The technique effect for improving grounding transformer failure cause Detection accuracy is showed.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in certain embodiment
The part of detailed description, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, can be by other
Mode is realized.Wherein, device embodiment described above is only schematical, such as division of described unit, Ke Yiwei
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can be according to the actual needs selected to realize the purpose of this embodiment scheme.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list
Unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is to realize in the form of SFU software functional unit and as independent production marketing or use
When, can store in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part for being contributed to prior art in other words or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are used to so that a computer
Equipment (can be personal computer, server or network equipment etc.) perform each embodiment methods described of the invention whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of grounding transformer fault detection method, it is characterised in that including：
Grounding transformer to breaking down carries out analysis of experiments and disassembling analysis, obtains analysis result, wherein, the experiment point
Analysis includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, and the disassembling analysis include described
Coil turn-to-turn short circuit analysis, spark location analysis and the short-circuit process analysis of the grounding transformer for breaking down；And
The reason that breaks down of the grounding transformer broken down according to analysis result analysis.
2. method according to claim 1, it is characterised in that the grounding transformer to breaking down carries out analysis of experiments bag
Include：
The grounding transformer that breaks down described in detection it is on high-tension side it is alternate, over the ground and low-pressure side it is alternate, whether deposit over the ground
Effectively insulating；
The inside and outside winding of each phase iron core of the grounding transformer broken down described in measurement.
3. method according to claim 1, it is characterised in that the grounding transformer to breaking down carries out disassembling analysis bag
Include：
The outer layer Y windings of the B phase iron cores of the grounding transformer broken down described in detection determine turn-to-turn short circuit original position；
The iron yoke of the grounding transformer for breaking down is pulled down to be carried out checking that determination failure coil puts iron yoke and iron core
Electric vestige；
The charing situation of the B phase coils of the grounding transformer broken down described in detection.
4. method according to claim 1, it is characterised in that is broken down according to analysis result analysis connects
The reason that breaks down of ground transformer includes：
Analysis result according to the disassembling analysis determine described in the outer layer Y of the B iron core columns of grounding transformer that breaks down around
Group is internal to there is turn-to-turn, layer short circuit failure.
5. method according to claim 1, it is characterised in that what is broken down according to analysis result analysis
After the reason that breaks down of grounding transformer, methods described also includes：
Trouble-saving strategy is determined according to the failure cause, wherein, the trouble-saving strategy is used to prevent grounding transformer
Break down, the trouble-saving strategy includes at least one of：
Improve the Flame Retardancy of the grounding transformer；
Fault simulating test is carried out to the grounding transformer；
Determine the optimal mode of connection of the grounding transformer.
6. a kind of grounding transformer failure detector, it is characterised in that including：
Experiment solution body unit, for carrying out analysis of experiments and disassembling analysis to the grounding transformer for breaking down, obtains analysis knot
Really, wherein, the analysis of experiments includes the Insulation Test of the grounding transformer for breaking down and D.C. resistance experiment, institute
Stating disassembling analysis includes that the coil turn-to-turn short circuit analysis of the grounding transformer for breaking down, spark location are analyzed and short
Road process analysis procedure analysis；And
Accident analysis unit, the original that breaks down of the grounding transformer for being broken down according to analysis result analysis
Cause.
7. device according to claim 6, it is characterised in that the experiment solution body unit includes：
First detection module, for detecting that the grounding transformer for breaking down is on high-tension side alternate, over the ground and low-pressure side
It is alternate, over the ground with the presence or absence of effectively insulation；
Measurement module, the inside and outside winding of each phase iron core for measuring the grounding transformer for breaking down.
8. device according to claim 6, it is characterised in that the experiment solution body unit includes：
Second detection module, for detecting that the outer layer Y windings of B phase iron cores of the grounding transformer for breaking down determine turn-to-turn
Short-circuit original position；
First determining module, carries out checking determination failure coil for the iron yoke of the grounding transformer for breaking down to be pulled down
To iron yoke and the spark tracking of iron core；
3rd detection module, the charing situation of the B phase coils for detecting the grounding transformer for breaking down.
9. device according to claim 6, it is characterised in that the accident analysis unit includes：
Second determining module, for the grounding transformer broken down described in being determined according to the analysis result of the disassembling analysis
There is turn-to-turn, layer short circuit failure in the outer layer Y windings inside of B iron core columns.
10. device according to claim 6, it is characterised in that described device also includes：
Determining unit, for the reason that breaks down in the grounding transformer broken down according to analysis result analysis
Afterwards, trouble-saving strategy is determined according to the failure cause, wherein, the trouble-saving strategy is used to prevent grounding transformer
Break down, the trouble-saving strategy includes at least one of：
Improve the Flame Retardancy of the grounding transformer；
Fault simulating test is carried out to the grounding transformer；
Determine the optimal mode of connection of the grounding transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142024.6A CN106841892A (en) | 2016-12-12 | 2016-12-12 | Grounding transformer fault detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142024.6A CN106841892A (en) | 2016-12-12 | 2016-12-12 | Grounding transformer fault detection method and device |
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| Publication Number | Publication Date |
|---|---|
| CN106841892A true CN106841892A (en) | 2017-06-13 |
Family
ID=59139935
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611142024.6A Pending CN106841892A (en) | 2016-12-12 | 2016-12-12 | Grounding transformer fault detection method and device |
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| CN112968423A (en) * | 2021-02-06 | 2021-06-15 | 山东理工大学 | Overcurrent protection method for protecting turn-to-turn short circuit fault of low-voltage winding of grounding transformer |
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Application publication date: 20170613 |