CN107703406A - A kind of power transformer iron core grounding monitor method and system - Google Patents
A kind of power transformer iron core grounding monitor method and system Download PDFInfo
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- CN107703406A CN107703406A CN201710900282.4A CN201710900282A CN107703406A CN 107703406 A CN107703406 A CN 107703406A CN 201710900282 A CN201710900282 A CN 201710900282A CN 107703406 A CN107703406 A CN 107703406A
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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
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention discloses a kind of power transformer iron core grounding monitor method and system, methods described includes：The current signal of substation collection power transformer iron core and folder is monitored, range swithching processing is carried out to current signal and sampling processing obtains measurement result, and measurement result is sent to Managing system of above position machine by wireless communication module；Managing system of above position machine receives measurement result, measurement result is shown, so that operations staff judges whether power transformer iron core multipoint earthing occurs according to measurement result.Monitor substation and current signal is subjected to range swithching processing, can be with automatic conversion milliampere level to the range between tens amperes, be not in be gone to measure the situation of milliampere level electric current with very big range, the resolving power and precision of measurement result ensure that, so that measurement result has very high reliability.Managing system of above position machine shows measurement result in real time so that operations staff just can timely be monitored in central station of floating dock.
Description
Technical field
The present invention relates to monitoring and control technology field, more particularly to a kind of power transformer iron core grounding monitor method
And system.
Background technology
Power transformer is one of equipment crucial in power system, and its normal operation is power system security and reliable
The important leverage of operation, and power transformer iron core is transmission, the critical piece for converting electromagnetic energy, it is electricity again to ensure its safety
The key point of power transformer normal operation.Power transformer iron core is to lead to some reliable grounds outside fuel tank through sleeve pipe,
If iron core when multipoint earthing occur in other positions, can cause circulation to cause hot-spot unshakable in one's determination to cause absolutely for some reason
Edge oil decomposition so that decreasing insulating, when serious, iron core can be burnt out, cause power transformer major accident.Relevant information is united
Meter shows, failure is accounted in the total accident of power transformer caused by problem unshakable in one's determination the 3rd, thus in time, reliably to electric power
Transformer core carries out grounding monitor, to ensureing that the normal operation of power transformer is significant.
At present, field operator has to the monitoring method of Transformer Core Grounding situation：First, stop in power transformer
Its insulation status is checked using measures such as visual examination, physics and chemistry, high voltage electrical tests when electric-examination is repaiied, these conventional methods only can
Lag information after transformer fault or accident is provided；Second, using the method for off-line monitoring, iron core grounding is measured by meter
Electric current reflects the operation conditions of iron core, still, because with the presence of powerful electromagnetic field, normal iron core grounding is electric around transformer
Weak electromagnetic field caused by stream is often submerged in the powerful electromagnetic field of transformer, therefore in normal work unshakable in one's determination, in iron core
The diverse location measurement of ground wire, as a result often difference is very big, and the reliability of measurement result is doubtful；Three are utilized in line
The method of monitoring, reflect the operation conditions of iron core by monitoring the earth current of iron core in real time, during due to normal operation unshakable in one's determination,
Earth current is milliampere level, and when multipoint earthing occurs in iron core, earth current may reach more than ten amperes, or even dozens of Ann
Training, earth current change scope very greatly, and monitoring device measurement so on a large scale earth current measurement result precision very
It is low, the generation of measurement error is often had, therefore, the reliability of measurement result is not also high.
In summary, how to solve the problems, such as can not timely, reliable Monitoring Power Transformer iron core grounding situation, be
Those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide a kind of power transformer iron core grounding monitor method and system, with solve can and
When, reliable Monitoring Power Transformer iron core grounding situation the problem of.
In order to solve the above technical problems, the present invention provides a kind of power transformer iron core grounding monitor method, including：
The current signal of substation collection power transformer iron core and folder is monitored, range swithching is carried out to the current signal
Processing and sampling processing obtain measurement result, and the measurement result is sent into host computer management system by wireless communication module
System；
The Managing system of above position machine receives the measurement result, the measurement result is shown, to run people
Member judges whether the power transformer iron core multipoint earthing occurs according to the measurement result.
Optionally, it is described the current signal is carried out range swithching processing and sampling processing obtain measurement result it
Before, in addition to：
The monitoring substation is filtered processing to the current signal.
Optionally, it is described the current signal is carried out range swithching processing and sampling processing obtain measurement result it
Afterwards, in addition to：
The monitoring substation is shown the measurement result.
Optionally, it is described the current signal is carried out range swithching processing and sampling processing obtain measurement result it
Afterwards, in addition to：
The monitoring substation judges whether the measurement result has exceeded threshold value set in advance, if it does, the prison
Control substation sends alarm.
Optionally, after judging that the measurement result has exceeded threshold value set in advance in the monitoring substation, in addition to：
The switch on-off resistance of the monitoring substation control relay.
Optionally, after the Managing system of above position machine receives the measurement result, in addition to：
The Managing system of above position machine judges whether the measurement result has exceeded threshold value set in advance, if it does,
Managing system of above position machine sends alarm.
Optionally, after the Managing system of above position machine judges that the measurement result has exceeded threshold value set in advance,
Also include：
The instruction of switching resistance is sent to the monitoring substation by the Managing system of above position machine by wireless communication module,
The monitoring substation receives the instruction of the switching resistance, the switch on-off resistance of the monitoring substation control relay.
Optionally, after the Managing system of above position machine receives the measurement result, in addition to：
Curent change curve is generated according to the measurement result and shown, so that operations staff becomes according to the electric current
Change curve to be predicted the ground state of the transformer core and folder.
Optionally, after the Managing system of above position machine receives the measurement result, in addition to：
The Managing system of above position machine stores the measurement result into database, so that operations staff checks history number
According to.
The present invention also provides a kind of power transformer iron core grounding monitor system, including：
Monitor substation, wireless communication module and Managing system of above position machine；
Wherein, the monitoring substation, for gathering the current signal of power transformer iron core and folder, the electric current is believed
Number carry out range swithching processing and sampling processing obtains measurement result, and the measurement result is passed through into the wireless communication module
It is sent to Managing system of above position machine；
The wireless communication module, for transmitting the information between the monitoring substation and the Managing system of above position machine；
The Managing system of above position machine, for receiving the measurement result, the measurement result is shown, to transport
Administrative staff judges whether the power transformer iron core multipoint earthing occurs according to the measurement result.
Power transformer iron core grounding monitor method and system provided by the present invention, monitoring substation collection power transformer
Unshakable in one's determination and folder current signal, range swithching processing is carried out to current signal and sampling processing obtains measurement result, and will be surveyed
Amount result is sent to Managing system of above position machine by wireless communication module；Managing system of above position machine receives measurement result, will measure
As a result shown, so that operations staff judges whether power transformer iron core multipoint earthing occurs according to measurement result.
Above-mentioned technical proposal disclosed in the present application, substation is monitored by the power transformer iron core collected and the electric current of folder
Signal carries out range swithching processing, can be not in very big with automatic conversion milliampere level to the range between tens amperes
Range goes to measure the situation of milliampere level electric current, the resolving power and precision of measurement result is ensure that, so that measurement result has
Very high reliability.Managing system of above position machine shows measurement result in real time so that operations staff can be in central station of floating dock
It inside just can timely be monitored, judge whether power transformer iron core multipoint earthing occurs by real-time measurement result
Situation, for example, during current value when the measurement result of display has exceeded normal work unshakable in one's determination, illustrate that multiple spot occurs in iron core
Ground connection.Therefore, above-mentioned technical proposal disclosed in the present application can timely, reliable Monitoring Power Transformer iron core grounding situation.
Brief description of the drawings
, below will be to embodiment or existing for the clearer explanation embodiment of the present invention or the technical scheme of prior art
The required accompanying drawing used is briefly described in technology description, it should be apparent that, drawings in the following description are only this hair
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
The flow chart for the power transformer iron core grounding monitor method that Fig. 1 is provided by the embodiment of the present invention；
The structured flowchart for the power transformer iron core grounding monitor system that Fig. 2 is provided by the embodiment of the present invention；
The structural frames of substation are monitored in the power transformer iron core grounding monitor system that Fig. 3 is provided by the embodiment of the present invention
Figure；
Fig. 4 is shown by range swithching circuit in power transformer iron core grounding monitor system that the embodiment of the present invention provides
It is intended to.
Embodiment
The present invention core be to provide a kind of power transformer iron core grounding monitor method and system, with solve can and
When, reliable Monitoring Power Transformer iron core grounding situation the problem of.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiment is only part of the embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, the flow for the power transformer iron core grounding monitor method that Fig. 1 is provided by the embodiment of the present invention
Figure, comprises the following steps：
Step 101：The current signal of substation collection power transformer iron core and folder is monitored, range is carried out to current signal
Conversion process and sampling processing obtain measurement result, and measurement result is sent into host computer management system by wireless communication module
System.
After monitoring substation collects the current signal of power transformer iron core and folder, by range change-over circuit to collection
The current signal arrived carries out range swithching processing, the purpose of the size automatic conversioning broad according to current signal is realized with this, i.e.,
When power transformer iron core is in normal operation, the electric current collected is milliampere level, is handled by range swithching, will be from turn
Less range is changed to, the measurement accuracy of weak current during with this to ensure normal operation unshakable in one's determination, when power transformer iron core is going out
During existing multipoint earth faults, the electric current collected can reach more than ten amperes even tens amperes, be handled by range swithching, will
Automatically switch to larger quantities journey, rather than less range before being continuing with, ensure that multipoint earth faults occurs in iron core with this
When heavy current measurement range, above-mentioned range swithching processing can be realized by range change-over circuit.
Sampling processing is carried out to the current signal by range swithching processing, the current signal for analog signal is changed into several
It is believed that number, it can so carry out follow-up processing.Sampling processing can be entered by 12 analog-digital converters inside single-chip microcomputer
OK, the spending of hardware aspect can be so reduced, it is cost-effective, while also cause the structure of hardware aspect to become simpler.
Wireless communication module can be GPRS communication modules, naturally it is also possible to be other wireless communication modules, as long as can
Realize the information transmission of monitoring substation and Managing system of above position machine.
Step 102：Managing system of above position machine receives measurement result, measurement result is shown, so as to operations staff's root
Judge whether power transformer iron core multipoint earthing occurs according to measurement result.
Managing system of above position machine receives the real-time measurements of iron core grounding electric current, and measurement result is included showing
On screen, operations staff is according to the real-time measurements of iron core grounding electric current it may determine that operation conditions unshakable in one's determination is normal instantly
Still there are multipoint earth faults, earth current very little during normal operation unshakable in one's determination is generally in below 100mA, therefore when operation
When personnel see that the measurement result shown has exceeded 100mA, it just may determine that iron core multipoint earth faults occurs, it is necessary to enter
Row maintenance is handled.
It can be seen that monitoring substation carries out the current signal of the power transformer iron core collected and folder at range swithching
Reason, can with automatic conversion milliampere level to the range between tens amperes, be not in go to measure milliampere level with very big range it is electric
The situation of stream, the resolving power and precision of measurement result are ensure that, so that measurement result has very high reliability.Host computer
Management system shows measurement result in real time so that operations staff just can timely be supervised in central station of floating dock
Survey, judge whether power transformer iron core multipoint earthing is in the presence of by real-time measurement result, for example, when showing
During current value when measurement result has exceeded normal work unshakable in one's determination, illustrate that multipoint earthing occurs in iron core.Therefore, disclosure
Above-mentioned technical proposal can timely, reliable Monitoring Power Transformer iron core grounding situation.
Method in above-mentioned embodiment can be further improved, improved method is：
Before measurement result is obtained to current signal progress range swithching processing and sampling processing, current signal is carried out
Filtering process.
Although it ensure that the essence of measurement result due to having carried out range swithching processing to current signal in such scheme
Degree, but the current signal due to collecting may contain interference signal, can also influence the reliability of measurement result, it is possible to
Processing is filtered to current signal by filter apparatus, weakens or eliminate the influence of interference signal, so as to further
Improve the reliability of measurement result.
Method in above-mentioned embodiment can be further improved, improved method is：
After measurement result is obtained to current signal progress range swithching processing and sampling processing, monitoring substation will measure
As a result shown.
Although measurement result is had been shown on Managing system of above position machine, so that operations staff is supervised in central station of floating dock
Survey, but when operations staff is safeguarded or checked at the scene, it is also desirable to the data of the earth current measured, measurement result is only
It is shown on Managing system of above position machine, the inconvenience of operations staff's work on the spot may be caused.Will measurement after measurement result is obtained
As a result it is shown on the display screen of monitoring substation, reference can be provided for the operations staff for being safeguarded or being checked at the scene.
Method in above-mentioned embodiment can be further improved, improved method is：
After measurement result is obtained to current signal progress range swithching processing and sampling processing, monitoring substation judges to survey
Whether amount result has exceeded threshold value set in advance, if it does, monitoring substation sends alarm.
Earth current very little during normal operation unshakable in one's determination can be set a threshold to generally in below 100mA
100mA, when monitoring substation and judging measurement result more than 100mA, monitoring substation sends alarm.There are multiple transformers at the scene, often
It is responsible for monitoring the earth current of each transformer core, when multipoint earth faults occurs in iron core, operations staff in individual monitoring substation
Need to come to the spot and failure iron core is safeguarded, monitoring substation, which sends alarm, to provide prompting for operations staff.
Set it should be noted that threshold value can be monitoring substation, can be what Managing system of above position machine was set, specifically
Being arranged to how many needs to be determined according to actual conditions, can also be modified according to actual conditions.Send the form of alarm
Can be light alarm, or audible alarm, can also be the form of other alarms.
Method in above-mentioned embodiment can be further improved, improved method is：
After judging that measurement result has exceeded threshold value set in advance in monitoring substation, monitoring substation control relay is opened
Close switching resistance.
Although when operations staff sees that the measurement result shown exceedes threshold value, it just may determine that multiple spot occurs in iron core
Earth fault is, it is necessary to carry out maintenance processing, but in actual conditions, operations staff needs the time to scene, at this section
In, iron core, which cannot be safeguarded, can be constantly in malfunction, and harmful effect is produced to transformer.Therefore, when monitoring substation is sentenced
When disconnected measurement result has exceeded threshold value set in advance, just the switch of relay is opened, resistance is sealed in earthed circuit
To suppress excessive electric current, timely unshakable in one's determination to failure emergency processing can be carried out, avoid the occurrence of the generation of the above situation.
It should be noted that the resistance for sealing in earthed circuit can be one or more, it is necessary to be determined according to actual conditions,
Resistance will select the larger resistance of power, to prevent heating from burning out.
Method in above-mentioned embodiment can be further improved, improved method is：
After Managing system of above position machine receives measurement result, Managing system of above position machine judges whether measurement result exceedes
Threshold value set in advance, if it does, Managing system of above position machine sends alarm.
Although operations staff oneself can judges whether iron core multipoint earth faults occurs according to measurement result,
Managing system of above position machine sends alarm can provide more direct prompting to operations staff, and alarm one is sent it is known that having
There are multipoint earth faults in iron core so that the judgement whether operations staff breaks down to iron core becomes easy, alleviates fortune
The workload of administrative staff.
Set it should be noted that threshold value can be monitoring substation, can be what Managing system of above position machine was set, specifically
Being arranged to how many needs to be determined according to actual conditions, can also be modified according to actual conditions.Send the form of alarm
Can be light alarm, or audible alarm, can also be the form of other alarms.
Method in above-mentioned embodiment can be further improved, improved method is：
After Managing system of above position machine judges that measurement result has exceeded threshold value set in advance, Managing system of above position machine will
The instruction of switching resistance is sent to monitoring substation by wireless communication module, and monitoring substation receives the instruction of switching resistance, monitoring
The switch on-off resistance of substation control relay.
Due to operations staff from judge iron core occur multipoint earth faults again to scene to iron core carry out safeguard need one
The fixed time, therefore operations staff can send the instruction of switching resistance to substation is monitored by Managing system of above position machine, remotely
The switch of relay is opened in control monitoring substation, resistance is sealed in earthed circuit to suppress excessive electric current.Except this it
Outside, can also be after substation automatic switching resistance be monitored, the resistance progress linear quadratic control according to actual conditions to switching, such as when
The resistance of automatic switching relative to electric current it is smaller when, by Managing system of above position machine send instruction seal in again earthed circuit one or
The multiple resistance of person.
Method in above-mentioned embodiment can be further improved, improved method is：
After Managing system of above position machine receives measurement result, curent change curve is generated according to measurement result and shown
Show, so that operations staff is predicted according to curent change curve to the ground state of transformer core and folder.
Managing system of above position machine generates real-time curent change curve, continuous curent change curve phase according to measurement result
For more direct with the digital measurement result shown, earth current somewhat has some raising cans significantly to monitor.
Sometimes the multipoint earth faults unshakable in one's determination that occur be not occur at once but change bit by bit is serious, therefore earth current is not yet
It is that will exceed normal value at once, at this moment curent change curve just can intuitively show this change progressively, fortune
Administrative staff's can is predicted according to curent change curve to the ground state of transformer core and folder, such as curent change
When incremental trend is presented in curve, operations staff can predict iron core and multipoint earth faults occur, it is necessary to which attendant arrives
Safeguarded at scene.
Method in above-mentioned embodiment can be further improved, improved method is：
After Managing system of above position machine receives measurement result, measurement result storage is arrived database by Managing system of above position machine
In, so that operations staff checks historical data.
Managing system of above position machine stores measurement result into database, and operations staff's can is checked or prints these
Historical data, these historical datas can reflect the running status of transformer equipment and the development trend of failure, to run people
Member provides specific data reference.
The power transformer iron core grounding monitor system provided below the embodiment of the present invention is introduced, and is described below
Power transformer iron core grounding monitor system can be mutually corresponding with above-described power transformer iron core grounding monitor method
Reference.
Referring to Fig. 2, the structural frames for the power transformer iron core grounding monitor system that Fig. 2 is provided by the embodiment of the present invention
Figure, power transformer iron core grounding monitor system can include：
Substation 201 is monitored, for gathering the current signal of power transformer iron core and folder, range is carried out to current signal
Conversion process and sampling processing obtain measurement result, and measurement result is sent into host computer pipe by wireless communication module 202
Reason system 203；
Wireless communication module 202, for transmitting the information between monitoring substation 201 and Managing system of above position machine 203；
Managing system of above position machine 203, for receiving measurement result, measurement result is shown, so as to operations staff's root
Judge whether power transformer iron core multipoint earthing occurs according to measurement result.
Wherein monitoring substation 201 can include：Current sensor 301, range swithching circuit 302, filter apparatus 303 and list
Piece machine 304；
Current sensor 301, for gathering the current signal of power transformer iron core and folder；
Current sensor can use punching leakage current sensor, and this leakage current sensor uses special high magnetic conduction
Material makees electromagnetic induction core parts and electronic compensating technology, has high-precision than poor characteristic, high-precision voltage output, measurement
The features such as accurate convenient, strong antijamming capability, while there is the angular difference characteristic of general precision, suitable for 6KV~500KV high-tension electricities
The distribution or integrated system of gas equipment ground lead leakage current and dielectric loss parameter detecting.For equipment safety operation, prevention
Property safeguard, performance evaluation provide reliable basis.It is of course also possible to use other current sensors, this has no effect on the present invention
Realization.
Range swithching circuit 302, handle to obtain conversion signal for carrying out range swithching to current signal；
Range swithching circuit can use circuit as shown in Figure 4, and the main body of the circuit is to apply OP27 operation amplifiers
The anti-phase ratio circuit of device, two multiway analog switches are accessed in the feedback line and in-phase input end of anti-phase ratio circuit
AD7503, the two multiway analog switches AD7503 are controlled by same control line, are synchronized action.When circuit 1 is connected
When, now multiplication factor is 0.15 times, likewise, when circuit 2, circuit 3 are connected with circuit 4, the multiplication factor difference of circuit
For 1.5 times, 15 times and 150 times, so by controlling multiway analog switch to can be realized as the automatic conversion of range.Certainly,
The automatic conversion of range can be realized using other circuits.
Filter apparatus 303, filtering signal is obtained for being filtered processing to conversion signal；
Single-chip microcomputer 304, measurement result is obtained for carrying out sampling processing to filtering signal, and measurement result passed through wireless
Communication module 202 is sent to Managing system of above position machine 203.
Single-chip microcomputer can use the single-chip microcomputer of C8051F020 models, and sampling processing then passes through 12 moulds inside single-chip microcomputer
Number converter is carried out, and can so reduce the spending of hardware aspect, cost-effective, while also the structure of hardware aspect is become
It is simpler.It is of course also possible to use the single-chip microcomputer with similar functions of other models, and sampling processing can also pass through
Analog-digital converter outside single-chip microcomputer is carried out, and these have no effect on the realization of the present invention.
Some further improvement can be carried out to the system in above-mentioned embodiment, improved method is：
Monitoring substation 201 can further include：
Display screen 305, for measurement result to be shown.
Single-chip microcomputer 304 can be also used for judging whether measurement result has exceeded threshold value set in advance；
Accordingly, monitoring substation 201 can further include：Alarm device 306, for judging to survey in single-chip microcomputer 304
After amount result has exceeded threshold value set in advance, alarm is sent.
Single-chip microcomputer 304 can be also used for after judging that measurement result has exceeded threshold value set in advance, control relay
Switch on-off resistance.
Single-chip microcomputer 304 can be also used for given threshold.
Managing system of above position machine 203 can be also used for judging whether measurement result has exceeded threshold value set in advance；
Accordingly, Managing system of above position machine 203 can further include：Alarm device, in host computer management system
After system judges that measurement result has exceeded threshold value set in advance, alarm is sent.
Managing system of above position machine 203 can be also used for sending the instruction of switching resistance to prison by wireless communication module 202
Substation 201 is controlled, to monitor the instruction that substation 201 receives switching resistance, the switch on-off resistance of control relay.
Managing system of above position machine 203 can further include：
Database, for storing measurement result, so that operations staff checks historical data.
Managing system of above position machine 203 can be also used for given threshold.
The power transformer iron core grounding monitor system of the present embodiment is used to realize foregoing power transformer iron core ground connection
Monitoring method, therefore the visible power transformer hereinbefore of embodiment in power transformer iron core grounding monitor system
The embodiment part of iron core grounding monitoring method, so, its embodiment is referred to corresponding various pieces embodiment
Description, will not be repeated here.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be with it is other
The difference of embodiment, between each embodiment same or similar part mutually referring to.For dress disclosed in embodiment
For putting, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part
Explanation.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think beyond the scope of this invention.
Directly it can be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Power transformer iron core grounding monitor method provided by the present invention and system are described in detail above.
Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is simply used
Understand the method and its core concept of the present invention in help.It should be pointed out that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these are improved and modification
Fall into the protection domain of the claims in the present invention.
Claims (10)
- A kind of 1. power transformer iron core grounding monitor method, it is characterised in that including：The current signal of substation collection power transformer iron core and folder is monitored, range swithching processing is carried out to the current signal Measurement result is obtained with sampling processing, and the measurement result is sent to Managing system of above position machine by wireless communication module；The Managing system of above position machine receives the measurement result, the measurement result is shown, so as to operations staff's root Judge whether the power transformer iron core multipoint earthing occurs according to the measurement result.
- 2. the method as described in claim 1, it is characterised in that it is described to the current signal carry out range swithching processing and Before sampling processing obtains measurement result, in addition to：The monitoring substation is filtered processing to the current signal.
- 3. method as claimed in claim 2, it is characterised in that it is described to the current signal carry out range swithching processing and After sampling processing obtains measurement result, in addition to：The monitoring substation is shown the measurement result.
- 4. method as claimed in claim 3, it is characterised in that it is described to the current signal carry out range swithching processing and After sampling processing obtains measurement result, in addition to：The monitoring substation judges whether the measurement result has exceeded threshold value set in advance, if it does, monitoring Station sends alarm.
- 5. method as claimed in claim 4, it is characterised in that it is pre- to judge that the measurement result has exceeded in the monitoring substation After the threshold value first set, in addition to：The switch on-off resistance of the monitoring substation control relay.
- 6. the method as described in claim 1, it is characterised in that the Managing system of above position machine receive the measurement result it Afterwards, in addition to：The Managing system of above position machine judges whether the measurement result has exceeded threshold value set in advance, if it does, upper Machine management system sends alarm.
- 7. method as claimed in claim 6, it is characterised in that judge that the measurement result surpasses in the Managing system of above position machine Cross after threshold value set in advance, in addition to：The instruction of switching resistance is sent to the monitoring substation by the Managing system of above position machine by wireless communication module, described Monitor the instruction that substation receives the switching resistance, the switch on-off resistance of the monitoring substation control relay.
- 8. method as claimed in claim 7, it is characterised in that the Managing system of above position machine receive the measurement result it Afterwards, in addition to：Curent change curve is generated according to the measurement result and shown, so that operations staff is bent according to the curent change Line is predicted to the ground state of the transformer core and folder.
- 9. method as claimed in claim 8, it is characterised in that the Managing system of above position machine receive the measurement result it Afterwards, in addition to：The Managing system of above position machine stores the measurement result into database, so that operations staff checks historical data.
- A kind of 10. power transformer iron core grounding monitor system, it is characterised in that including：Monitor substation, wireless communication module and Managing system of above position machine；Wherein, the monitoring substation, for gathering the current signal of power transformer iron core and folder, the current signal is entered The processing of row range swithching and sampling processing obtain measurement result, and the measurement result is sent by the wireless communication module To Managing system of above position machine；The wireless communication module, for transmitting the information between the monitoring substation and the Managing system of above position machine；The Managing system of above position machine, for receiving the measurement result, the measurement result is shown, to run people Member judges whether the power transformer iron core multipoint earthing occurs according to the measurement result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900282.4A CN107703406A (en) | 2017-09-28 | 2017-09-28 | A kind of power transformer iron core grounding monitor method and system |
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| CN109085451A (en) * | 2018-08-30 | 2018-12-25 | 国网北京市电力公司 | The detection method and device of iron core grounding in transformer, storage medium |
| CN110954845A (en) * | 2019-12-19 | 2020-04-03 | 深圳供电局有限公司 | CT secondary circuit multipoint earth fault on-line monitoring system and method |
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Address after: 311199 No. 165, Star Bridge Road, Star Bridge Street, Yuhang District, Hangzhou, Zhejiang Applicant after: ZHEJIANG TRULY ELECTRIC Co.,Ltd. Applicant after: STATE GRID ZHEJIANG HANGZHOU YUHANG POWER SUPPLY Co. Applicant after: HANGZHOU POWER SUPPLY COMPANY, STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: 311199 No. 165, Star Bridge Road, Star Bridge Street, Yuhang District, Hangzhou, Zhejiang Applicant before: ZHEJIANG TRULY ELECTRIC Co.,Ltd. Applicant before: STATE GRID ZHEJIANG HANGZHOU YUHANG POWER SUPPLY Co. Applicant before: HANGZHOU POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER Co. |
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