CN106932682B - Grounding loop detection method for one-point grounding of voltage total station - Google Patents
Grounding loop detection method for one-point grounding of voltage total station Download PDFInfo
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- CN106932682B CN106932682B CN201710178665.5A CN201710178665A CN106932682B CN 106932682 B CN106932682 B CN 106932682B CN 201710178665 A CN201710178665 A CN 201710178665A CN 106932682 B CN106932682 B CN 106932682B
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- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 230000003071 parasitic effect Effects 0.000 claims description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011895 specific detection 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 method for detecting a grounding loop of a voltage total station with one point grounded, and relates to the technical field of power grid detection. The grounding loop detection method of the voltage loop N line total station one-point grounding takes a grounding net as a communication medium, and judges whether the grounding is good or not by judging the consistency of received and transmitted digital signal current data and detecting whether a complete direct current loop voltage is formed or not; the grounding loop detection method can quickly and accurately perform grounding judgment, solves the problem that whether the voltage is measured by using a universal meter resistor gear to judge whether the grounding is performed or not, greatly reduces protection misoperation caused by poor grounding of the ground wire, reduces detection difficulty, reduces workload of maintenance personnel, improves the level of safe operation of a power grid system, and has remarkable significance for detection of the power grid system.
Description
Technical Field
The invention belongs to the technical field of power grid detection, and particularly relates to a method for detecting a grounding loop of a voltage total station with one point grounded.
Background
The N-line total station one-point grounding of the voltage loop of the power system is a very typical wiring form, especially for double-bus wiring plant stations and 500kV stations. However, the wiring mode has a great disadvantage that two points are easily grounded because the output impedance of the resistance gear of the universal meter is smaller, so that the voltage measured by the resistance gear of the universal meter cannot be used for judging whether the power supply is grounded, and particularly for the expansion and reconstruction engineering, if the power supply cannot be found once the voltage N line is poorly grounded, the power supply belongs to a blind area which puzzles the secondary circuit inspection for a long time; meanwhile, protection misoperation is caused for many times in the power industry system. The ground condition can only be estimated by the voltage measurement to obtain an empirical value, and the ground condition is not checked by an accurate method.
Therefore, there is a need in the art for a safe and reliable method of determining the reliability of grounding.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for detecting a grounding loop of a voltage loop N-line total station point grounding.
The invention solves the technical problems by the following technical scheme: a method for detecting a grounding loop of a voltage loop N-line total station point grounding comprises the following steps:
1. the signal generating unit of the detecting instrument sends digital signal current to the to-be-detected point of the ground network, the digital signal current flows back to the detecting instrument through the ground network, the signal is collected by the signal collecting unit of the detecting instrument, the microprocessor of the detecting instrument compares the sent digital signal current with the collected signal, if the sent digital signal current is inconsistent with the collected signal, the grounding point is poorly grounded, if the sent digital signal current is consistent with the collected signal, the grounding point is well grounded, and the digital signal current is displayed through the touch display screen module of the detecting instrument; the ratio of the consistency of the received and transmitted signals can reflect the good grounding and the interference degree of the external environment;
2. the resistance value of a detection loop in the detection instrument is regulated by regulating the potentiometer of the detection instrument, the magnitude of the current sending out a digital signal is controlled, and the magnitude of the external detection ground wire contact resistance is controlled, so that communication failure is avoided, the external detection ground wire contact resistance is generally tens of ohms, and if the external detection ground wire contact resistance exceeds the value, communication failure is caused; the resistance value of the detection loop in the detection instrument generally reaches thousands of ohms, the output impedance is larger, and the defect that whether the voltage is grounded or not cannot be measured by using a resistance gear of the universal meter due to the fact that two points are grounded because the output impedance of the universal meter is smaller is overcome;
3. stopping sending the digital signal current, sending a high-level signal to the to-be-detected point, returning to the detection instrument through the grounding network, judging the voltage at two ends of the resistor of the detection loop in the detection instrument, and if the to-be-detected point is reliably connected with the grounding network, forming a direct current path, wherein the voltage at two ends of the resistor is close to a normal reference voltage value, and the to-be-detected point is well grounded; if the point to be measured is disconnected from the ground network and has larger parasitic capacitance, although the communication of the step 1 and the step 2 is normal, a direct current path cannot be formed, and the voltage cannot be detected, then the point to be measured is in poor contact, and the step 3 avoids the defects that the signal sent in the step 1 and the step 2 belongs to a high-frequency signal, and when the parasitic capacitance reaches a certain value due to the influence of the parasitic capacitance of the cable, the direct current path cannot be formed in practice, and the detection is interfered and misjudged.
Further, the detecting instrument further comprises a signal isolation transmitting unit which plays an isolating role on transmitting signals, and the microprocessor of the detecting instrument is respectively connected with the signal generating unit, the signal acquisition unit and the touch display screen module, and the signal generating unit is connected with the signal isolation transmitting unit.
The microprocessor is used for controlling the signal generation unit to send signals and receiving signals acquired by the signal sampling unit, comparing and processing the acquired signals of the sent signals, and sending the processing results to the touch display screen module for display; the signal generating unit is used for sending out signals such as digital signal current, high level and the like; the signal isolation transmitting unit is used for isolating the transmitted signals; the signal sampling unit is used for collecting signals input to the detection instrument and sending the signals to the microprocessor for processing; and the touch display screen module is used for displaying detection results, setting parameters of a detection instrument and the like.
Further, the signal generating unit comprises an enabling control unit and a high-frequency signal generating unit, the enabling control unit is respectively connected with the high-frequency signal generating unit and the microprocessor, and the high-frequency signal generating unit is connected with the signal isolation transmitting unit.
Furthermore, an AD conversion unit, a Flash storage unit and a USART full-duplex universal synchronous/asynchronous serial transceiver module are arranged in the microprocessor, the AD conversion unit is connected with the signal acquisition unit, and the USART full-duplex universal synchronous/asynchronous serial transceiver module is connected with the touch display screen module.
Compared with the prior art, the grounding loop detection method for the one-point grounding of the voltage loop N line total station uses the grounding network as a communication medium, and judges whether the grounding is good or not by judging the consistency of the received and transmitted digital signal current data and detecting whether the complete direct current loop voltage is formed or not; the grounding loop detection method can quickly and accurately perform grounding judgment, solves the problem that whether the voltage is measured by using a universal meter resistor gear to judge whether the grounding is performed or not, greatly reduces protection misoperation caused by poor grounding of the ground wire, reduces detection difficulty, reduces workload of maintenance personnel, improves the level of safe operation of a power grid system, and has remarkable significance for detection of the power grid system.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart showing the steps of a method for detecting a grounding loop of a voltage loop with N-line total station point grounding;
FIG. 2 is a schematic diagram of the field ground loop detection of the present invention;
FIG. 3 is a schematic diagram of the resistance equivalent of the ground loop detection of the present invention;
fig. 4 is a capacitive equivalent schematic diagram of the ground loop detection of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and fig. 2, the detection of a grounding loop of a voltage loop with N-line total station point grounding is provided in the present invention, where a test point is generally a grounding shell of a protection device, or N-line, another test point is generally a nearby ground network, and the ground network is used as a communication medium to form a communication loop, and the specific detection steps include:
1. the signal generating unit of the detecting instrument sends digital signal current to the test point 2 of the ground screen, the digital signal current flows back to the detecting instrument through the ground screen, the signal is collected by the signal collecting unit of the detecting instrument, the microprocessor of the detecting instrument compares the sent digital signal current with the collected signal, if the sent digital signal current is inconsistent with the collected signal, the grounding point is poorly grounded, if the sent digital signal current is consistent with the collected signal, the grounding point is well grounded, and the digital signal current is displayed through the touch display screen module of the detecting instrument;
2. stopping sending the digital signal current, sending a high-level signal to the test point 2, returning to the detection instrument through the ground network, judging the voltage at two ends of a resistor of a detection loop in the detection instrument, and forming a direct current path if the test point 2 is reliably connected with the ground network, wherein the voltage at two ends of the resistor is close to a normal reference voltage value; if the test point 2 is disconnected from the ground network and has larger parasitic capacitance, a direct current path cannot be formed although communication is normal, and the detection voltage is zero, the point to be detected is in poor contact.
As shown in a resistance equivalent schematic diagram of ground loop detection in fig. 3, a resistor R is a ground line resistance between a test point 1 and a test point 2 in fig. 2, a signal (including digital signal current and high level) sent by a signal generating unit of a detecting instrument flows back to a signal collecting unit of the detecting instrument through the resistor R to form normal communication, and when the sent signal is high level, a voltage value U should be close to a reference voltage value VDD instead of zero due to a resistance voltage division principle, so that the ground is good; when the line resistance R is larger than a certain value, communication failure is caused by overlarge attenuation of signal current, and the critical value of the line resistance R is controlled by adjusting the sizes of R1 and R2, so that the communication failure is avoided.
As shown in the capacitive equivalent schematic diagram of the ground loop detection shown in fig. 4, the capacitor C is the parasitic capacitance of the ground cable between the test point 1 and the test point 2 shown in fig. 2 to the ground network, because the digital signal current sent by the signal generating unit of the detecting instrument belongs to the high-frequency signal, the digital signal current flows back to the signal collecting unit of the detecting instrument through the capacitor C to form normal communication, but the impedance of the capacitor to direct current is infinite, a direct current path is not formed when the impedance is input to a high level, the voltage U is zero, the ground fault is represented, and the phenomenon of misjudgment caused by detecting only through the step 1 is avoided.
The invention adopts a grounding loop detection method of the voltage loop N line total station one-point grounding, which takes a grounding net as a communication medium, and judges whether the grounding is good or not by judging the consistency of received and transmitted digital signal current data and detecting whether a complete direct current loop voltage is formed or not; the grounding loop detection method can quickly and accurately perform grounding judgment, solves the problem that whether the voltage is measured by using a universal meter resistor gear to judge whether the grounding is performed or not, greatly reduces protection misoperation caused by poor grounding of the ground wire, reduces detection difficulty, reduces workload of maintenance personnel, improves the level of safe operation of a power grid system, and has remarkable significance for detection of the power grid system.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.
Claims (4)
1. The method for detecting the grounding loop of the voltage loop N-line total station one-point grounding is characterized by comprising the following detection steps:
step 1, a signal generating unit of a detecting instrument sends digital signal current to a to-be-detected point of a ground network, the digital signal current flows back to the detecting instrument through the ground network, a signal collecting unit of the detecting instrument collects signals, a microprocessor of the detecting instrument compares the sent digital signal current with the collected signals, if the sent digital signal current is inconsistent with the collected signals, the to-be-detected point is poorly grounded, if the sent digital signal current is consistent with the collected signals, the to-be-detected point is well grounded, and the to-be-detected point is displayed through a touch display screen module of the detecting instrument; the magnitude of the digital signal current is controlled by adjusting a potentiometer of a detection instrument, so that the magnitude of an external detection ground wire contact resistance is controlled;
step 2, stopping sending the digital signal current, sending a high-level signal to the point to be detected, returning to the detection instrument through the ground network, judging the voltage at two ends of a resistor of a detection loop in the detection instrument, and if the point to be detected is reliably connected with the ground network, forming a direct current path, wherein the voltage at two ends of the resistor is close to a normal reference voltage value, and the point to be detected is well grounded; if the to-be-measured point is disconnected from the ground network and has larger parasitic capacitance, although the communication in the step 1 is normal, a direct current path cannot be formed, and the detection voltage is zero, the to-be-measured point is in poor contact.
2. The ground loop detection method as set forth in claim 1, wherein the detection instrument further comprises a signal isolation transmitting unit for isolating the transmitted signal, and the microprocessor of the detection instrument is respectively connected with the signal generating unit, the signal acquisition unit and the touch display screen module, and the signal generating unit is connected with the signal isolation transmitting unit.
3. The ground loop detection method according to claim 1 or 2, wherein the signal generation unit includes an enable control unit and a high frequency signal generation unit, the enable control unit being connected to the high frequency signal generation unit, the high frequency signal generation unit being connected to the signal isolation transmission unit.
4. The ground loop detection method according to claim 1 or 2, wherein the microprocessor is provided with an AD conversion unit, a Flash storage unit and a USART full duplex universal synchronous/asynchronous serial transceiver module, the AD conversion unit is connected to the signal acquisition unit, and the USART full duplex universal synchronous/asynchronous serial transceiver module is connected to the touch display screen module.
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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 |
| 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 |
| 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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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. |