CN106771637A - Electric line inspection earthing wire state on-line monitoring method and device - Google Patents
Electric line inspection earthing wire state on-line monitoring method and device Download PDFInfo
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- CN106771637A CN106771637A CN201610958053.3A CN201610958053A CN106771637A CN 106771637 A CN106771637 A CN 106771637A CN 201610958053 A CN201610958053 A CN 201610958053A CN 106771637 A CN106771637 A CN 106771637A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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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
- 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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of electric line inspection earthing wire state on-line monitoring method and device, the method comprising the steps of 1, the negative, positive pole output end of electric power system is connected to ground by the first ground wire and the second ground wire respectively, measures the first current value that first ground wire is flowed through；Step 2, electric power system cathode output end is electrically connected by electrical connection with electric line, measures the second current value that first ground wire flows through and the 3rd current value that the inspection earthing line is flowed through；Step 3, voltage value according to first current value, the second current value, the 3rd current value and electric power system draws the earth resistance of the inspection earthing line, judge that the inspection earthing line is in ground state or removes liftoff state, the digitlization on-line checking of earth wire earth resistance is formed by the device.The present invention can further real-time monitoring ground wire ground state it is whether good, to overcome and be grounded problem that is abnormal and can not being found in time in work progress.
Description
Technical field
The present invention relates to a kind of electric line inspection earthing wire state on-line monitoring method and device.
Background technology
Reliable mounting ground wire can be that high-low voltage power line and safely providing for maintenance of electrical equipment reliably ensure, really
Protect personal safety of the operating personnel during construction operation.Because the operating personnel that unreliable mounting ground wire triggers is constructing
Electric shock event in operation process happens occasionally.Changing after service work is completed and before recovery power transmission, it is necessary to mounting
Ground wire is removed ability recovery system and is powered completely, and the major accident of switching on earth wire will otherwise occur.Although each Electricity Department
Door takes strict control measures, and is configured with coherent detection instrument, but in recent years, distribution line switching on earth wire power transmission
Serious accident still frequently occurs.
Traditional detecting system of connecting wires has the following disadvantages：
It is only capable of judging whether circuit has installing or omit (dismounting) ground connection, but the ground wire grounded resistance that can not achieve a butt joint
Digitlization on-line checking, it is impossible to determine whether whether earthing effect is good, whether effective and real-time monitoring is (whole for ground connection
Continued to monitor during upkeep operation) whether the ground state of ground wire good, can overcome in work progress, due to ground connection
The problem that the problems such as drill rod loosens, earthing clamp disconnects is triggered ground connection abnormal and can not be found in time.
The content of the invention
The invention provides a kind of electric line inspection earthing wire state on-line monitoring method and device, the back of the body is which overcomed
The deficiencies in the prior art described in scape technology.
One of the technical solution adopted for the present invention to solve the technical problems is：
Electric line inspection earthing wire state on-line monitoring method, it includes following monitoring step：
Step 1, cathode output end, the cathode output end of electric power system are connected by the first ground wire and the second ground wire respectively
Ground is connected to, the first earth resistance R is formed1With the second earth resistance R2And the self-impedance of the monitoring device is formed with the electric power system
Measuring loop, measures first earth resistance R1The the first current value I for flowing through1If, first current value I1Less than first threshold,
Then can determine whether first earth resistance R1And/or the second earth resistance R2Ground connection is abnormal；
Step 2, electric power system cathode output end is electrically connected by electrical connection with electric line, and with the transmission and distribution line
The inspection earthing line on road forms electrical circuit, and the equivalent earth resistance R of maintenance is formed after inspection earthing line ground connection3, measure this first
Earth resistance R1The the second current value I for flowing through2Earth resistance R equivalent with the maintenance3The 3rd current value I for flowing through3；
Step 3, according to first current value I1, the second current value I2, the 3rd current value I3And the power supply electricity of electric power system
Pressure value U can draw the first earth resistance R1, the second earth resistance R2Earth resistance R equivalent with maintenance3Resistance value, if the maintenance
Equivalent earth resistance R3Less than Second Threshold, then can determine whether that system overhaul ground wire is in effective grounding state, if maintenance is equivalent
Earth resistance R3More than the Second Threshold, then can determine whether that inspection earthing line is in ground connection abnormality, if the equivalent ground connection electricity of maintenance
Resistance R3It is infinity, then can determine whether that system overhaul ground wire is in and remove liftoff state.
Among one embodiment：First ground wire, the second ground wire and the 3rd ground wire are respectively all by being grounded drill rod
Ground connection.
The two of the technical solution adopted for the present invention to solve the technical problems are：
For the device of the described electric line inspection earthing state on_line monitoring of one of scheme, it includes electric power system
And intelligence control system, the electric power system electrically connects the intelligence control system and for the intelligence control system is powered, and this is intelligently controlled
System processed includes microcontroller, A/D converter, alarm module, the first current transformer and the second current transformer, and the A/D turns
The digital output end of parallel operation is connected to the input of microcontroller, and first current transformer and the second current transformer are connected to
The analog input end of A/D converter, the alarm module is connected to the output end of microcontroller, and first current transformer is installed
On the negative pole output lead of electric power system.
Among one embodiment：Including the first current value I can be shown1, the second current value I2, the 3rd current value I3And first connect
Ground resistance R1, the second earth resistance R2Earth resistance R equivalent with maintenance3Display module, the display module is connected to the microcontroller
The output end of device.
Among one embodiment：The electric power system includes energy-storage module, management of charging and discharging module and charging inlet, the charging
Interface and energy-storage module all connect the charge management module, and the electric energy for completing energy-storage module by the management of charging and discharging module is input into
Storage and output power supply management.
Among one embodiment：First current transformer is arranged on the negative pole output lead of electric power system, and described the
Two current transformers are for convenience of the clamp current transformer for loading and unloading.
Compared with background technology, it has the following advantages that the technical program：
1st, by the ground state monitoring step described in this case, different measuring loops are formed, obtains the first current value, the
Two current values and the 3rd current value and the voltage value with reference to electric power system can obtain the ground connection of each ground wire in monitoring process
Resistance, thus understand each ground wire whether reliable ground and ground state it is whether good.
2nd, by the earthing condition monitor described in this case, the ginseng obtained needed for the ground each step of status monitoring that achieves a butt joint
The intelligence acquisition of numerical value (the first current value, the second current value, the 3rd current value), and the ground connection of each ground wire of intelligence computation is electric
Resistance, forms the digitlization on-line checking of earth wire earth resistance, determines whether whether earthing effect is good, whether ground connection has
Imitate and whether the ground state of real-time monitoring (being continued to monitor during whole upkeep operation) ground wire is good, can overcome
What the problems such as being disconnected due to the loosening of ground connection drill rod, earthing clamp in work progress was triggered ground connection abnormal and can not be found in time
Problem.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structured flowchart of the device of the electric line inspection earthing state on_line monitoring described in the present embodiment.
Fig. 2 is that the circuit of the electric line inspection earthing wire state on-line monitoring method step 1 described in the present embodiment connects
Map interlinking.
Fig. 3 is the connection schematic diagram of electric line inspection earthing line.
Fig. 4 is the equivalent circuit diagram of circuit shown in Fig. 2.
Fig. 5 is that the circuit of the electric line inspection earthing wire state on-line monitoring method step 2 described in the present embodiment connects
Map interlinking.
Fig. 6 is the equivalent circuit diagram of circuit shown in Fig. 5.
Specific embodiment
Refer to Fig. 1, the device of electric line inspection earthing state on_line monitoring, it includes electric power system 1 and intelligence
Control system 2, the electric power system 1 electrically connects the intelligence control system 2 and for the intelligence control system 2 is powered, the Based Intelligent Control
System 2 includes microcontroller 21, A/D converter 22, alarm module 23, the first current transformer 24 and the second current transformer
25, the digital output end of the A/D converter 22 is connected to the input of microcontroller 21, first current transformer 24 and second
Current transformer 25 is connected to the analog input end of A/D converter 22, and the alarm module 23 is connected to the output of microcontroller 21
End, the microcontroller 21 can be using microcontroller chips such as single-chip microcomputers.
Preferably, the monitoring device also includes display module 26, and the display module 26 is connected to the defeated of the microcontroller 21
Go out end, the display module 26 is used to show the current value and respectively connect that the first current transformer 24 and the second current transformer 25 are obtained
Grounding resistance of ground wire etc., enables that each parameter value obtained in measurement process shows in real time by display module 26
Come, so that maintainer pinpoints the problems and solve problem in time according to the parameter value of display.
In the present embodiment, the electric power system 1 includes energy-storage module 11, management of charging and discharging module 12 and charging inlet 13,
The charging inlet 13 and energy-storage module 11 all connect the charge management module 12, and energy storage is completed by the management of charging and discharging module 12
The electric energy input storage of module 11 and output power supply management, the energy-storage module 11 can be lithium battery group.
In the present embodiment, first current transformer 24 is arranged on the negative pole output lead of electric power system 1, for surveying
Direct access flows through the current value on electric power system cathode output end during amount, and second current transformer 25 is for convenience of handling
Clamp current transformer.
With reference to above-mentioned monitoring device, electric line inspection earthing wire state on-line monitoring method, it includes following monitoring
Step：
Step 1, refer to Fig. 2, Fig. 3 and Fig. 4, and cathode output end, the cathode output end of electric power system 1 pass through first respectively
Ground wire and the second ground wire are connected to ground, form the first earth resistance R1With the second earth resistance R2And with the shape of electric power system 1
Into the self-impedance measuring loop of the monitoring device, electric power system 1 is opened, measure first earth resistance R1The first electric current for flowing through
Value I1；The negative pole output lead of first ground wire and electric power system 1 on the same circuit line, therefore by above-mentioned monitoring device
The first current transformer 24 can measure first current value and by first current value store it is stand-by.Meanwhile, maintainer can
By first current value I for measuring1, judge whether first ground wire and the second ground wire of the self-impedance measuring loop are grounded
Well, if first current value I1Less than first threshold (such as 5mA), it is meant that the first earth resistance R1With the second earth resistance
R2Sum is larger, the alarm module alarm of monitoring device, now reminds maintainer to check the first ground wire and the second ground wire
Whether reliable ground (ground connection whether loosen, whether embedded depth enough), whether grounding connection line contacts well.
Step 2, refer to Fig. 5 and Fig. 6, and the cathode output end of electric power system 1 is electrically connected by electrical connection with electric line
Connect, and electrical circuit is formed with the inspection earthing line of the electric line, the equivalent ground connection of maintenance is formed after inspection earthing line ground connection
Resistance R3(the equivalent earth resistance R of the maintenance3It is the parallel equivalent resistance value of all inspection earthing lines of electric line, because transmission ＆ distribution
Electric line upkeep operation may mount a plurality of inspection earthing line), measure the second current value I that first ground wire is flowed through2And this
The 3rd current value I that inspection earthing line is flowed through3；The negative pole output lead of first ground wire and electric power system 1 is in the same circuit
On line, therefore the first current transformer 24 by above-mentioned monitoring device can measure second current value I2；By monitoring device
Second current transformer 25 is articulated in electrical connection, you can measure the 3rd current value I that the inspection earthing line is flowed through3。
Step 3, according to first current value I1, the second current value I2, the 3rd current value I3And the power supply electricity of electric power system
Pressure value U can draw the earth resistance of the inspection earthing line, and its measuring principle is as follows：
First：After system completes wiring diagram shown in Fig. 2, system equivalent schematic diagram is as shown in Figure 3.
KVL kirchhoff loop voltage equations can be arranged according to Fig. 3 as follows：
U=I1(R1+R2) (1)
Secondly：After system completes wiring diagram shown in Fig. 4, systematic schematic diagram is as shown in Figure 5.
KVL kirchhoff loop voltage equations can be arranged according to Fig. 5 as follows：
U=I3R3+I2R1 (2)
0=I3R3-(I2-I3)R2 (3)
Equation is constituted by formula (1), (2), (3), is tried to achieve：
R2=U (I2-I1)/I1I3 (4)
R1=U/I1-R2 (5)
R3=(U-I2R1)/I3 (6)
If drawing the equivalent earth resistance R of the maintenance3Less than Second Threshold, then can determine whether that the inspection earthing line is in ground connection shape
State, if the earth resistance is more than the Second Threshold, can determine whether that the inspection earthing line is in ground connection abnormality, if maintenance is equivalent
Earth resistance R3It is infinity, then can determine whether that inspection earthing line is in and remove liftoff state.
When third step is gone to, two kinds of monitoring situations can be divided into, one kind is whether each inspection earthing line of monitoring can be abutted against
Ground, another kind is whether each inspection earthing line of monitoring is removed completely.
When monitor each inspection earthing line whether reliable ground when, maintainer is filled in actual maintenance process by the monitoring
The first current value I is seen on the display module 26 put1, the second current value I2, the 3rd current value I3And the first earth resistance R1,
Two earth resistance R2Earth resistance R equivalent with maintenance3With registration, if the equivalent earth resistance R of the maintenance3Less than Second Threshold, then
Can determine whether that the inspection earthing line is in ground state, if the earth resistance is more than the Second Threshold, can determine whether the inspection earthing
Line is in ground connection abnormality, and alarm module 23 starts alarm, it is meant that the equivalent earth resistance R of maintenance3It is very big, should now check
Whether electrical connection is reliably connected with by maintenance electric line, all inspection earthing lines whether reliable ground, until alarm module
23 alarms disappear.
When whether each inspection earthing line of monitoring is removed completely, maintainer removes all first in actual maintenance process
Inspection earthing line (disconnects inspection earthing line and the connection by maintenance electric line), if all inspection earthing lines are reliably torn open
Remove, now overhaul equivalent earth resistance R3It is infinity, the alarm module 23 of monitoring device starts alarm；If not alarming or examining
It is not infinity to repair equivalent earth resistance, then need to check the investigation situation of all inspection earthing lines, until all inspection earthing lines
It is reliable to remove, alarm is heard, the first ground wire, the second ground wire, close monitoring device, inspection earthing line prison are finally removed again
Survey end-of-job.
Above-mentioned the first ground wire, the second ground wire and the 3rd ground wire all can be grounded by being grounded drill rod respectively.
The above, only present pre-ferred embodiments, therefore can not according to this limit the scope of present invention implementation, i.e., according to
Equivalence changes that the scope of the claims of the present invention and description are made and modification, all should still belong in the range of the present invention covers.
Claims (6)
1. electric line inspection earthing wire state on-line monitoring method, it is characterised in that：Including following monitoring step：
Step 1, cathode output end, the cathode output end of electric power system are connected to by the first ground wire and the second ground wire respectively
Ground, forms the first earth resistance R1With the second earth resistance R2And the self-impedance measurement of the monitoring device is formed with the electric power system
Loop, measures first earth resistance R1The the first current value I for flowing through1If, first current value I1Less than first threshold, then may be used
Judge first earth resistance R1And/or the second earth resistance R2Ground connection is abnormal；
Step 2, electric power system cathode output end is electrically connected by electrical connection with electric line, and with the electric line
Inspection earthing line forms electrical circuit, and the equivalent earth resistance R of maintenance is formed after inspection earthing line ground connection3, measure first ground connection
Resistance R1The the second current value I for flowing through2Earth resistance R equivalent with the maintenance3The 3rd current value I for flowing through3；
Step 3, according to first current value I1, the second current value I2, the 3rd current value I3And the voltage value of electric power system
U can draw the first earth resistance R1, the second earth resistance R2Earth resistance R equivalent with maintenance3Resistance value, if the maintenance is equivalent
Earth resistance R3Less than Second Threshold, then can determine whether that system overhaul ground wire is in effective grounding state, if overhauling equivalent ground connection
Resistance R3More than the Second Threshold, then can determine whether that inspection earthing line is in ground connection abnormality, if overhauling equivalent earth resistance R3For
Infinity, then can determine whether that system overhaul ground wire is in and remove liftoff state.
2. electric line inspection earthing wire state on-line monitoring method according to claim 1, it is characterised in that：It is described
First ground wire, the second ground wire and the 3rd ground wire are all grounded by being grounded drill rod respectively.
3. the device of electric line inspection earthing state on_line monitoring as claimed in claim 1 is used for, it is characterised in that：Bag
Electric power system and intelligence control system are included, the electric power system electrically connects the intelligence control system and for the intelligence control system is supplied
Electricity, the intelligence control system includes microcontroller, A/D converter, alarm module, the first current transformer and the second Current Mutual Inductance
Device, the digital output end of the A/D converter is connected to the input of microcontroller, and first current transformer and the second electric current are mutual
Sensor is connected to the analog input end of A/D converter, and the alarm module is connected to the output end of microcontroller.
4. the device of electric line inspection earthing state on_line monitoring according to claim 3, it is characterised in that：Including
The first current value I can be shown1, the second current value I2, the 3rd current value I3And the first earth resistance R1, the second earth resistance R2And inspection
Repair equivalent earth resistance R3Display module, the display module is connected to the output end of the microcontroller.
5. the device of electric line inspection earthing state on_line monitoring according to claim 3, it is characterised in that：It is described
Electric power system includes energy-storage module, management of charging and discharging module and charging inlet, and the charging inlet and energy-storage module all connect this and fill
Electric management module, the electric energy for completing energy-storage module by the management of charging and discharging module is input into storage and output power supply management.
6. the device of electric line inspection earthing state on_line monitoring according to claim 3, it is characterised in that：It is described
First current transformer is arranged on the negative pole output lead of electric power system, and second current transformer is for convenience of the pincers for loading and unloading
Type current transformer.
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| CN201610958053.3A CN106771637B (en) | 2016-10-27 | 2016-10-27 | Electric line inspection earthing threadiness state on-line monitoring method |
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| CN201610958053.3A CN106771637B (en) | 2016-10-27 | 2016-10-27 | Electric line inspection earthing threadiness state on-line monitoring method |
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| CN106771637B CN106771637B (en) | 2019-06-25 |
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Cited By (9)
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| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN109799393A (en) * | 2018-12-29 | 2019-05-24 | 王翰凌 | Earth resistance tester for home circuit |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| 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 |
| CN111239644A (en) * | 2019-10-17 | 2020-06-05 | 武汉海尔热水器有限公司 | Grounding detection system and method |
| CN111652389A (en) * | 2020-05-28 | 2020-09-11 | 广东电网有限责任公司 | Distribution network primary equipment grounding maintenance layout method, device, equipment and medium |
| CN113791282A (en) * | 2021-09-13 | 2021-12-14 | 深圳市欧拓自动化科技有限公司 | Power utilization safety monitoring system and building thereof |
| CN113917365A (en) * | 2021-10-26 | 2022-01-11 | 国网河南省电力公司濮阳供电公司 | Multifunctional intelligent grounding wire system and use method thereof |
| CN113933618A (en) * | 2021-09-10 | 2022-01-14 | 荣耀终端有限公司 | Test device, radio frequency device and detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN107607830B (en) * | 2017-09-13 | 2021-07-20 | 广西电网有限责任公司电力科学研究院 | Method for continuously monitoring protective grounding state of electrical equipment |
| 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 |
| CN109799393A (en) * | 2018-12-29 | 2019-05-24 | 王翰凌 | Earth resistance tester for home circuit |
| CN109799393B (en) * | 2018-12-29 | 2024-03-12 | 王翰凌 | Ground resistance tester for household circuit |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
| CN111239644A (en) * | 2019-10-17 | 2020-06-05 | 武汉海尔热水器有限公司 | Grounding detection system and method |
| CN111652389A (en) * | 2020-05-28 | 2020-09-11 | 广东电网有限责任公司 | Distribution network primary equipment grounding maintenance layout method, device, equipment and medium |
| CN111652389B (en) * | 2020-05-28 | 2024-02-27 | 广东电网有限责任公司 | Distribution network primary equipment grounding overhaul layout method, device, equipment and medium |
| CN113933618A (en) * | 2021-09-10 | 2022-01-14 | 荣耀终端有限公司 | Test device, radio frequency device and detection system |
| CN113791282A (en) * | 2021-09-13 | 2021-12-14 | 深圳市欧拓自动化科技有限公司 | Power utilization safety monitoring system and building thereof |
| CN113791282B (en) * | 2021-09-13 | 2024-03-19 | 深圳市欧拓自动化科技有限公司 | Electricity safety monitoring system and building thereof |
| CN113917365A (en) * | 2021-10-26 | 2022-01-11 | 国网河南省电力公司濮阳供电公司 | Multifunctional intelligent grounding wire system and use method thereof |
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