CN106932682A - A kind of earth-return circuit detection method of voltage whole station one point earth - Google Patents
A kind of earth-return circuit detection method of voltage whole station one point earth Download PDFInfo
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- CN106932682A CN106932682A CN201710178665.5A CN201710178665A CN106932682A CN 106932682 A CN106932682 A CN 106932682A CN 201710178665 A CN201710178665 A CN 201710178665A CN 106932682 A CN106932682 A CN 106932682A
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000002955 isolation Methods 0.000 claims description 9
- 230000003071 parasitic effect Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 14
- 238000012360 testing method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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Abstract
The invention discloses a kind of earth-return circuit detection method of voltage whole station one point earth, it is related to power network detection technique field.The earth-return circuit detection method of described voltage circuit N line whole station one point earths, with earth mat as communication media, by judging the uniformity of the digital current signal data of transmitting-receiving, and judge whether ground connection is good by detecting whether to be formed complete DC loop voltage；Described earth-return circuit detection method can quickly and accurately carry out ground connection judgement; solve the problems, such as that cannot measure voltage using universal meter resistance grade judges whether ground connection; greatly reduce because of ground wire grounded bad caused false protection; reduce detection difficulty; reduce the workload of attendant; the level of network system safe operation is improve, there is significant meaning for the detection of network system.
Description
Technical field
A kind of earth-return circuit the invention belongs to power network detection technique field, more particularly to voltage whole station one point earth is detected
Method.
Background technology
Power system voltage loop N line whole station one point earths are a kind of very typical connection types, especially for double
Bus wiring plant stand and 500kV websites.But the mode of connection have one it is very big the drawbacks of, be exactly because universal meter resistance grade output
Impedance comparison is small, easily causes two points ground fault, leads to not measure voltage using universal meter resistance grade judge whether to have connect
Ground, especially for enlarging, reconstruction project, if once voltage N lines imperfect earth cannot find, belong to long-standing problem secondary returning
The blind area of road inspection；Simultaneously false protection is repeatedly caused in power industry internal system.Only just sent out in extra high voltage system in recent years
Raw multiple, existing method can only obtain empirical value and speculate Grounding by voltage measurement, not have accurate method inspection.
Therefore, a kind of method that can reliably and securely judge Earthing Reliability is needed badly in the industry.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of earth-return circuit inspection of voltage circuit N lines whole station one point earth
Survey method.
The present invention is to solve above-mentioned technical problem by the following technical solutions：A kind of voltage circuit N lines whole station one
The earth-return circuit detection method of point ground connection, including：
1st, the signal generating unit of detecting instrument sends digital current signal to the tested point of earth mat, and detection is flow back into by earth mat
Instrument, signal is gathered by the signal gathering unit of detecting instrument, and the data signal that the microprocessor contrast of detecting instrument sends is electric
Stream and collection signal, if sending inconsistent with the signal of collection, the earth point imperfect earth, if sending the signal one with collection
Cause, then earth point ground connection is good, and touching display screen module by detecting instrument shows；The ratio of receiving and transmitting signal uniformity
Good and external environment condition the annoyance level of ground connection can be reflected；
2nd, the resistance value of measure loop in detecting instrument is adjusted by adjusting the potentiometer of detecting instrument, control sends data signal
The size of electric current controls the size of external detection ground contact resistance, so as to avoid communication failure, external detection ground contact
Resistance is generally tens ohm, if exceeding this numerical value, can cause communication failure；The resistance value one of measure loop in detecting instrument
As reach several kilohms, output impedance is larger, solves because universal meter output impedance is smaller causes two points ground fault, it is impossible to use
Universal meter resistance grade measurement voltage whether grounded defect；
3rd, stop sending digital current signal, high level signal is sent to tested point, detecting instrument is flow back into by earth mat, to inspection
The resistance both end voltage for surveying instrument internal measure loop is judged, if tested point is formed with earth mat being reliably connected, forms straight
Logical circulation road, close to normal reference voltage level, then tested point ground connection is good for the resistance both end voltage；If tested point and earth mat
Disconnect and exist larger parasitic capacitance, although step 1,2 communications are normal, but can not form DC channel, can't detect voltage,
The then tested point loose contact, the step 3 is avoided because the signal sent in step 1 and 2 belongs to high-frequency signal, due to cable
The influence of parasitic capacitance, when parasitic capacitance reaches certain value, although normal for high-frequency signal communication, but it is actually unable in shape
Into DC channel, detection is interfered, the defect of erroneous judgement.
Further, the detecting instrument also includes signal isolation transmitter unit, and isolation is played a part of to transmission signal,
The microprocessor of the detecting instrument is connected with signal generating unit, signal gathering unit and touching display screen module respectively,
The signal generating unit is connected with signal isolation transmitter unit.
The microprocessor, for the letter that control signal generating unit sending signal and reception signal sampling unit are collected
Number, and collection signal to sending signal compares and treats, and result is sent into touching display screen module shows；
The signal generating unit, for sending the signals such as digital current signal, high level；Signal isolation transmitter unit, for hair
The signal for going out is isolated；Signal sampling unit, the signal of detecting instrument is input to for gathering, and send the signal to micro-
Processor is processed；Touching display screen module, the setting etc. for showing testing result and detecting instrument parameter.
Further, the signal generating unit includes enabling control unit and high-frequency signal generating unit, enables control
Unit connects high-frequency signal generating unit and microprocessor, high-frequency signal generating unit connection signal isolation transmitter unit respectively.
Further, AD conversion unit, Flash memory cell and USART full duplexs are provided with the microprocessor general
The serial transceiver module of synchronous/asynchronous, and AD conversion unit is connected with signal gathering unit, USART full duplexs universal synchronous/different
Serial transceiver module is walked to be connected with touching display screen module.
Compared with prior art, the earth-return circuit detection side of voltage circuit N lines whole station one point earth provided by the present invention
Method, with earth mat as communication media, the uniformity of the digital current signal data by judging transmitting-receiving, and by detecting whether shape
Judge whether ground connection is good into complete DC loop voltage；Described earth-return circuit detection method can be quickly and accurately
Ground connection judgement is carried out, solves the problems, such as that cannot measure voltage using universal meter resistance grade judges whether ground connection, greatly reduces
Because of ground wire grounded bad caused false protection, detection difficulty is reduced, reduce the workload of attendant, improve power network
The level of system safety operation, has significant meaning for the detection of network system.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, embodiment will be described below needed for the accompanying drawing to be used
It is briefly described, it should be apparent that, drawings in the following description are only one embodiment of the present of invention, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
The step of Fig. 1 is a kind of earth-return circuit detection method of voltage circuit N lines whole station one point earth of the invention flow
Figure；
Fig. 2 is live earth-return circuit detects schematic diagram of the invention；
Fig. 3 is the equivalent resistance schematic diagram of earth-return circuit detection of the invention；
Fig. 4 is the capacitor equivalent schematic diagram of earth-return circuit detection of the invention.
Specific embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made,
Belong to the scope of protection of the invention.
As depicted in figs. 1 and 2, the earth-return circuit detection of voltage circuit N lines whole station one point earth provided by the present invention, surveys
Pilot is generally the grounding shell of protection device, or N lines, and another test point is generally earth mat nearby, is situated between by communication of earth mat
Matter forms communication loop, and specific detecting step includes：
1st, the signal generating unit of detecting instrument sends digital current signal to the test point 2 of earth mat, and inspection is flow back into by earth mat
Instrument is surveyed, signal, the data signal of the microprocessor contrast transmission of detecting instrument are gathered by the signal gathering unit of detecting instrument
Electric current and collection signal, if sending inconsistent with the signal of collection, the earth point imperfect earth, if sending the signal with collection
Unanimously, then earth point ground connection is good, and touching display screen module by detecting instrument shows；
2nd, stop sending digital current signal, high level signal is sent to test point 2, detecting instrument is flow back into by earth mat, it is right
The resistance both end voltage of detecting instrument inside measure loop is judged, if test point 2 is formed with earth mat being reliably connected, is formed
DC channel, the resistance both end voltage is close to normal reference voltage level；If test point 2 disconnects and exists larger with earth mat
Parasitic capacitance, although communication is normal, but can not form DC channel, and detection voltage is zero, then the tested point loose contact.
The equivalent resistance schematic diagram of earth-return circuit detection as shown in Figure 3, resistance R is test point 1 shown in Fig. 2 and test point 2
Between the resistance of ground wire line, the signal that the signal generating unit of detecting instrument sends（Including digital current signal and high level）Pass through
Resistance R is back to the signal gathering unit of detecting instrument, forms proper communication, when signal is sent for high level, due to resistance
Voltage divider principle, magnitude of voltage U close to reference voltage level VDD, and should be not zero, and represent that ground connection is good；When line resistance R arrives greatly certain value
When, due to the excessive critical value for causing communication failure, hindering R come control line by adjusting R1, R2 size of signal code decay, it is to avoid
Communication failure.
The capacitor equivalent schematic diagram of earth-return circuit detection as shown in Figure 4, electric capacity C is test point 1 shown in Fig. 2 and test point 2
Between earth cable to the parasitic capacitance of earth mat, because the digital current signal that the signal generating unit of detecting instrument sends belongs to
High-frequency signal, the signal gathering unit of detecting instrument is back to by electric capacity C, forms proper communication, but electric capacity is to direct current
Impedance is infinitely great, during input high level, does not become DC channel, and voltage U is zero, represent imperfect earth, it is to avoid only logical
Cross step 1 to detect, cause the phenomenon of erroneous judgement.
The earth-return circuit detection method of the voltage circuit N line whole station one point earths that the present invention is used, is situated between by communication of earth mat
Matter, the uniformity of the digital current signal data by judging transmitting-receiving, and to form complete DC loop by detecting whether
Whether voltage is good to judge ground connection；Described earth-return circuit detection method can quickly and accurately carry out ground connection judgement, solution
Having determined cannot measure the problem that voltage judge whether ground connection using universal meter resistance grade, greatly reduce and bad led because ground wire grounded
The false protection of cause, reduces detection difficulty, reduces the workload of attendant, improves the water of network system safe operation
It is flat, there is significant meaning for the detection of network system.
Above disclosed is only specific embodiment of the invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, can readily occur in change or modification, all
Should be included within the scope of the present invention.
Claims (4)
1. a kind of earth-return circuit detection method of voltage circuit N lines whole station one point earth, it is characterised in that including following detection step
Suddenly：
Step 1, the signal generating unit of detecting instrument send digital current signal to the tested point of earth mat, are flow back into by earth mat
Detecting instrument, signal is gathered by the signal gathering unit of detecting instrument, and the numeral that the microprocessor contrast of detecting instrument sends is believed
Number electric current and collection signal, if sending inconsistent with the signal of collection, the earth point imperfect earth, if sending and the letter for gathering
Number consistent, then earth point ground connection is good, and touching display screen module by detecting instrument shows；The data signal electricity
The size of stream is controlled by adjusting the potentiometer of detecting instrument, so as to control the size of external detection ground contact resistance；
Step 2, stopping send digital current signal, and high level signal is sent to tested point, and detecting instrument is flow back into by earth mat,
Resistance both end voltage to detecting instrument inside measure loop judges, if tested point is formed with earth mat being reliably connected, shape
Into DC channel, close to normal reference voltage level, then tested point ground connection is good for the resistance both end voltage；If tested point with
Earth mat disconnects and there is larger parasitic capacitance, although step 1 communicates normally, but can not form DC channel, and detection voltage is
Zero, then the tested point loose contact.
2. earth-return circuit detection method as claimed in claim 1, it is characterised in that the detecting instrument also includes signal isolation
Transmitter unit, plays a part of isolation to transmission signal, the microprocessor of the detecting instrument respectively with signal generating unit, letter
Number collecting unit and the connection of touching display screen module, the signal generating unit are connected with signal isolation transmitter unit.
3. earth-return circuit detection method as claimed in claim 1 or 2, it is characterised in that the signal generating unit includes making
Can control unit and high-frequency signal generating unit, enable control unit connection high-frequency signal generating unit, high-frequency signal generation list
Unit's connection signal isolation transmitter unit.
4. earth-return circuit detection method as claimed in claim 1 or 2, it is characterised in that AD is provided with the microprocessor and is turned
Change unit, Flash memory cell and USART full duplexs universal synchronous/asynchronous serial transceiver module, and AD conversion unit and letter
Number collecting unit is connected, and USART full duplexs universal synchronous/asynchronous serial transceiver module is connected with touching display screen module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178665.5A CN106932682B (en) | 2017-03-23 | 2017-03-23 | Grounding loop detection method for one-point grounding of voltage total station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178665.5A CN106932682B (en) | 2017-03-23 | 2017-03-23 | Grounding loop detection method for one-point grounding of voltage total station |
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| Publication Number | Publication Date |
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| CN106932682A true CN106932682A (en) | 2017-07-07 |
| CN106932682B CN106932682B (en) | 2023-09-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107765131A (en) * | 2017-10-12 | 2018-03-06 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of earth-return circuit detecting system of transformer substation voltage whole station one point earth |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
| CN108594312A (en) * | 2018-07-30 | 2018-09-28 | 吉林省电力科学研究院有限公司 | A kind of the grounded screen breakpoint detection device and method of arch form solenoid transmission coil |
| CN110007180A (en) * | 2018-01-05 | 2019-07-12 | 深圳康普盾科技股份有限公司 | A kind of ground line connection reliability test method and device |
| CN110988741A (en) * | 2019-12-20 | 2020-04-10 | 深圳海致洋科技有限公司 | Full-automatic line inspection method and full-automatic line inspection instrument |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107765131A (en) * | 2017-10-12 | 2018-03-06 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of earth-return circuit detecting system of transformer substation voltage whole station one point earth |
| CN107843784A (en) * | 2017-10-27 | 2018-03-27 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics method of testing to be flowed back using earth mat |
| CN107843784B (en) * | 2017-10-27 | 2019-10-11 | 国网陕西省电力公司电力科学研究院 | A kind of large-scale grounding network high frequency characteristics test method to be flowed back using earth mat |
| CN110007180A (en) * | 2018-01-05 | 2019-07-12 | 深圳康普盾科技股份有限公司 | A kind of ground line connection reliability test method and device |
| CN108594312A (en) * | 2018-07-30 | 2018-09-28 | 吉林省电力科学研究院有限公司 | A kind of the grounded screen breakpoint detection device and method of arch form solenoid transmission coil |
| CN108594312B (en) * | 2018-07-30 | 2024-05-07 | 吉林省电力科学研究院有限公司 | Grounding grid breakpoint detection device and method for arch solenoid transmitting coil |
| CN110988741A (en) * | 2019-12-20 | 2020-04-10 | 深圳海致洋科技有限公司 | Full-automatic line inspection method and full-automatic line inspection instrument |
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| CN106932682B (en) | 2023-09-29 |
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Effective date of registration: 20231103 Address after: 530021 the Guangxi Zhuang Autonomous Region Qingxiu District of Nanning Hui Chun Road No. 3 Patentee after: EXTRA-HIGH VOLTAGE POWER TRANSMISSION (NANJING) CORPORATION OF CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: 530021 the Guangxi Zhuang Autonomous Region Qingxiu District of Nanning Hui Chun Road No. 3 Patentee before: EXTRA-HIGH VOLTAGE POWER TRANSMISSION (NANJING) CORPORATION OF CHINA SOUTHERN POWER GRID Co.,Ltd. Patentee before: GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT Co.,Ltd. |