CN110514903A - Ground resistance state evaluation and on-line early warning cloud monitoring system - Google Patents
Ground resistance state evaluation and on-line early warning cloud monitoring system Download PDFInfo
- Publication number
- CN110514903A CN110514903A CN201910933650.4A CN201910933650A CN110514903A CN 110514903 A CN110514903 A CN 110514903A CN 201910933650 A CN201910933650 A CN 201910933650A CN 110514903 A CN110514903 A CN 110514903A
- Authority
- CN
- China
- Prior art keywords
- module
- signal
- conversion module
- cabinet
- ground resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000011156 evaluation Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 15
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 101100236764 Caenorhabditis elegans mcu-1 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention proposes a kind of ground resistance state evaluations and on-line early warning cloud monitoring system, terminal is detected including several, detecting terminal includes cabinet, cabinet is mounted on cross arm of tower, cabinet top is equipped with solar panel, the bottom of box is equipped with outlet hole, signal processing unit is equipped in cabinet, signal processing unit passes through outlet hole by signal wire and is connected with signal acquisition unit, signal processing unit is connected with MCU, MCU respectively with power conversion module, signal generating unit, communication module, clock module, locating module is connected with memory module, power conversion module is connected with solar storage battery and reserve battery respectively, signal generating unit is connected with signal acquisition unit.For the present invention by not limited by distance to ground resistance real-time monitoring in each region, system group network is convenient, realizes the monitoring to multiple data of monitoring point simultaneously in different location, once there is exception, timely notification area responsible person is overhauled.
Description
Technical field
It is the present invention relates to the technical field of insulating resistance measuring more particularly to a kind of ground resistance state evaluation and pre- online
Alert cloud monitoring system.
Background technique
In recent years, lightning stroke trip is constantly in first of all kinds of failures, lightning hazards have become influence transmission line of electricity
An important factor for safe operation, and after route thunderbolt, the Intruding wave for being passed to substation along transmission line of electricity threatens substation again
Interior electrical equipment is often again the principal element for causing substation accident, especially lightening activity is strong, soil resistivity
Distribution transforming equipment failure rate caused by area high, with a varied topography is higher, causes huge economic loss.
And the lightening hazard of route occupies larger specific gravity in the total lightening hazard of electric system.And route thunderbolt
Afterwards, the electrical equipment in substation is threatened again along the Intruding wave that transmission line of electricity is passed to substation, be often again to cause substation's thing
Therefore key factor.In short, the lightning strike accident of transmission line of electricity takes place frequently, and destroyed very greatly caused by electric system.Solution at present
Certainly the method for the above problem is that earthing or grounding means is installed to transmission line of electricity, and it is logical that qualified earthing or grounding means can provide aerial drainage to lightning current
Road, to be effectively prevented from the lightning stroke trip of transmission line of electricity.Grounding resistance be measure earthing or grounding means whether He Ge important finger
Mark, in order to guarantee various electrical equipments and electrical equipment earthing or grounding means safe and reliable operation, it is necessary to periodically be to ground connection by regulation
The grounding resistance of system measures inspection.And since transmission system shaft tower is large number of, to the ground resistance of earthed system into
Row scene actual measurement becomes as very hard work.
Summary of the invention
Large number of for transmission system shaft tower in region, manual measurement work is very heavy, and when manual measurement is also easy
The technical issues of introducing human error, the present invention propose a kind of ground resistance state evaluation and on-line early warning cloud monitoring system.
To solve the above-mentioned problems, the technical scheme of the present invention is realized as follows:
A kind of ground resistance state evaluation and on-line early warning cloud monitoring system, including several detection terminals, detection terminal include
Cabinet, cabinet are mounted on cross arm of tower, and cabinet top is equipped with solar panel, and the bottom of box is equipped with outlet hole, in cabinet
Equipped with signal processing unit, signal processing unit passes through outlet hole by signal wire and is connected with signal acquisition unit, signal letter
Number processing unit is connected with MCU, MCU respectively with power conversion module, signal generating unit, communication module, clock module, fixed
Position module is connected with memory module, and power conversion module is connected with solar storage battery and reserve battery respectively, signal hair
Raw unit is connected with signal acquisition unit；The communication module is connected with host computer, host computer and background control system phase
Connection, background control system are connected with mobile terminal.
Preferably, the lower box is equipped with connecting plate, and connecting plate bottom offers mounting groove, mounting groove and cross arm of tower
It matches and cross arm of tower is connected with connecting plate.
Preferably, the signal acquisition unit includes current transformer and voltage transformer, and current transformer and voltage are mutual
Sensor is connected with signal processing unit and voltage transformer is connected with signal generating unit.
Preferably, the signal processing unit includes Current Voltage conversion module II, and Current Voltage conversion module II is distinguished
With in signal acquisition unit current transformer and voltage transformer be connected, Current Voltage conversion module II and filter module phase
Connection, filter module are connected with range switching module, and range switching module is connected with AC-DC conversion module, and alternating current-direct current turns
Mold changing block is connected with AD conversion module, and AD conversion module is connected with MCU.
Preferably, the signal generating unit includes signal generating module, and signal generating module is connected with MCU, signal
Module occurs to be connected with Current Voltage conversion module I, Current Voltage conversion module I is connected with signal amplification module, signal
Amplification module is connected with signal selection module, and signal selection module is connected with power amplifier module, power amplifier module with
Voltage transformer is connected.
Preferably, the communication module is GPRS communication module.
Preferably, the voltage transformer and current transformer are respectively annular voltage transformer and ring current mutual inductance
Device.
Beneficial effects of the present invention: the present invention also serves as frequency conversion by current transformer and voltage transformer, voltage transformer
Voltage signal injects coil to ground resistance real-time monitoring in each region, detects the locating module in terminal in real time to detection position
Position monitor is carried out, every detection parameters are transmitted to MCU, and MCU is supreme by every detection parameters real-time Transmission by communication module
Position machine is not limited by distance, and system group network is convenient, background control system receive every detection parameters realize different location simultaneously
Monitoring to multiple data of monitoring point, once there is exception, the timely notification area responsible person of background control system is overhauled.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is system architecture diagram of the invention.
Fig. 2 is the structural schematic diagram that terminal is detected in the present invention.
Fig. 3 is the bottom view of Fig. 2.
Fig. 4 is signal functional block diagram of the invention.
In figure, 1 is MCU, and 2 be signal generating module, and 3 be Current Voltage conversion module I, and 4 be signal amplification module, and 5 are
Signal selection module, 6 be power amplifier module, and 7 be voltage transformer, and 8 be current transformer, and 9 be Current Voltage conversion module
II, 10 be filter module, and 11 be range switching module, and 12 be AC-DC conversion module, and 13 be AD conversion module, and 14 be positioning mould
Block, 15 be power conversion module, and 16 be clock module, and 17 be memory module, and 18 be 4G module, and 19 be solar storage battery, 20
It is solar panel for cabinet, 21,22 be connecting plate, and 23 be mounting groove, and 24 be outlet hole.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of ground resistance state evaluation and on-line early warning cloud monitoring system, including several detections are eventually
End, detection terminal includes cabinet 20, and cabinet 20 is mounted on cross arm of tower, and 20 lower part of cabinet is equipped with connecting plate 22, connecting plate 22
Bottom offers mounting groove 23, and mounting groove 23 is matched with cross arm of tower and cross arm of tower is connected cabinet i.e. with connecting plate 22
It is mounted on cross arm of tower, and is fixedly connected with connecting plate with cross-arm using bolt.
As shown in Figures 2 and 3,20 top of cabinet is equipped with solar panel 21, and solar panel 21 and solar energy store
Battery 19 is connected, and 20 bottom of cabinet is equipped with outlet hole 24, is equipped with signal processing unit in cabinet 20, signal processing unit passes through
Signal wire passes through outlet hole 24 and is connected with signal acquisition unit, and signal processing unit is connected with MCU1, MCU1 difference
With power conversion module 15, signal generating unit, communication module 18,17 phase of clock module 16, locating module 14 and memory module
Connection, power conversion module 15 is connected with solar storage battery 19 and reserve battery respectively, with power conversion module to the sun
The case where energy storage device and reserve battery switch over power supply source, detection case are avoided to power off, clock module by timing, based on
When etc., locating module is GPS positioning module or Beidou positioning module for positioning in real time to measurement position, and memory module is for this
Ground stores detection data, and signal generating unit is connected with signal acquisition unit；The communication module 18 is connected with host computer,
Communication module 18 is GPRS communication module, will test parameter using communication module and is real-time transmitted to host computer, is convenient for monitoring center
Each local ground resistance situation is understood in real time, and host computer is connected with background control system, background control system and mobile terminal phase
Connection, mobile terminal is smart phone or tablet computer, once there is exception in somewhere shaft tower downlead grounding resistance, not in safety
When within value range, background control system is responsible for human hand held mobile terminal into region and sends warning message, reminds Regional Champion
Carry out repair and maintenance.
The signal acquisition unit includes current transformer 8 and voltage transformer 7, current transformer 8 and voltage transformer 7
It is connected with signal processing unit, voltage transformer 7 and current transformer 8 are respectively annular voltage transformer and ring current
Mutual inductor, voltage transformer and current transformer are placed into mounting groove when not in use, voltage transformer and current transformer
In measurement in use, voltage transformer and current transformer are connect respectively on four downleads of shaft tower, 8 He of current transformer
Voltage transformer 7 is connected with signal processing unit and voltage transformer 7 is connected with signal generating unit.
The signal processing unit includes Current Voltage conversion module II 9, and Current Voltage conversion module II 9 is used for voltage
Mutual inductor or the signal of current transformer detection are converted, and Current Voltage conversion module II 9 is respectively and in signal acquisition unit
Current transformer 8 be connected with voltage transformer 7, Current Voltage conversion module II 9 is connected with filter module 10, utilizes filter
Wave module is filtered the signal of conversion, and filter module 10 is connected with range switching module 11, is switched by range
The signal of filtering is switched to MCU and corresponded in digital quantity range ability by module, range switching module 11 and AC-DC conversion module
12 are connected, using AC-DC conversion module will signal carries out being converted into direct current, AC-DC conversion module 12 to treated
It is connected with AD conversion module 13, DC signal is finally converted into digital signal, AD conversion module 13 is connected with MCU1.
The signal generating unit includes signal generating module 2, and signal generating module 2 is connected with MCU1, MCU control letter
Number module occurs to downlead injecting voltage signal, voltage transformer also serves as voltage injection coil, signal generating module 2 and electric current
Voltage transformation module I 3 is connected, and carries out signal conversion, Current Voltage modulus of conversion to signal source using Current Voltage conversion module I
Block I 3 is connected with signal amplification module 4, and signal amplification module is used for the signal enhanced processing after conversion, signal amplification module
4 are connected with signal selection module 5, and signal selection module is used to provide one and follows the selection exported to signal to three,
By a kind of signal be converted into it is another compared with standard volume or reference quantity after signal, for dividing scope control, valve sequence or defeated
It selects out, signal selection module 5 is connected with power amplifier module 6, and power amplifier module is used to carry out power to selection signal
Enhanced processing, power amplifier module 6 are connected with voltage transformer 7.
As shown in figure 4, when in use connecing voltage transformer and current transformer on downlead, voltage transformer is utilized
The input coil for also serving as frequency variation signal carries out frequency variation signal injection, the voltage of measurement, current signal real-time Transmission to more downleads
Pass through simultaneously to MCU, MCU by location information, temporal information and the storage to memory module of voltage and current information at this
Above- mentioned information are transmitted to host computer by GPRS communication network, and monitoring center receives detection information everywhere by host computer, with
It is calculated afterwards by the line measurement of exempting to solve of pole tower ground resistance using specific matrix equation, by measuring earth conductor voltage, electricity
Stream, establishes the matrix equation of voltage, electric current, sets Zg specially to be tested pole tower ground resistance impedance value, ZL is all bars in left side
Tower parallel equivalent resistance impedance value, ZR are all shaft tower parallel equivalent resistance impedance values in right side, and Z1 and Z2 are respectively tested shaft tower
The two lightning protection line equivalent resistance impedance value between the first base shaft tower of the left and right sides.By solution matrix equation, that is, it can determine circuit
Parameter.If the ground resistance of shaft tower is Rg, then Rg=Re (Zg), may be implemented the rapid survey of pole tower ground resistance, avoid survey
Examination personnel must unlock the hard work of extra downlead, be applicable to alleviate containing the shaft tower of any a plurality of downlead
The labor intensity of staff, also greatly improved measuring accuracy and measurement efficiency.Once being connect at shaft tower downlead in region
When ground resistance value is not in safe range value, background control system sends alarm signal to Regional Champion, and region is reminded to be responsible for
People carries out repair and maintenance to downlead in region.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of ground resistance state evaluation and on-line early warning cloud monitoring system, which is characterized in that terminal is detected including several,
Detecting terminal includes cabinet (20), and cabinet (20) is mounted on cross arm of tower, and cabinet (20) top is equipped with solar panel
(21), solar panel (21) is connected with solar storage battery (19), and cabinet (20) bottom is equipped with outlet hole (24), cabinet
(20) signal processing unit is equipped in, signal processing unit passes through outlet hole (24) by signal wire and is connected with signal acquisition unit
Connect, signal processing unit is connected with MCU(1), MCU(1) respectively with power conversion module (15), signal generating unit,
Communication module (18), clock module (16), locating module (14) are connected with memory module (17), power conversion module (15) point
It is not connected with solar storage battery (19) and reserve battery, signal generating unit is connected with signal acquisition unit；It is described logical
News module (18) are connected with host computer, and host computer is connected with background control system, and background control system is connected with mobile terminal
It connects.
2. ground resistance state evaluation according to claim 1 and on-line early warning cloud monitoring system, which is characterized in that described
Cabinet (20) lower part is equipped with connecting plate (22), and connecting plate (22) bottom offers mounting groove (23), and mounting groove (23) and shaft tower are horizontal
Load matches and cross arm of tower is connected with connecting plate (22).
3. ground resistance state evaluation according to claim 1 and on-line early warning cloud monitoring head, which is characterized in that described
Signal acquisition unit includes current transformer (8) and voltage transformer (7), current transformer (8) and voltage transformer (7) with
Signal processing unit is connected and voltage transformer (7) is connected with signal generating unit.
4. ground resistance state evaluation according to claim 1 or 3 and on-line early warning cloud monitoring system, which is characterized in that
The signal processing unit includes Current Voltage conversion module II (9), Current Voltage conversion module II (9) respectively with signal acquisition
Current transformer (8) in unit is connected with voltage transformer (7), Current Voltage conversion module II (9) and filter module
(10) it is connected, filter module (10) is connected with range switching module (11), range switching module and (11) AC-DC conversion
Module (12) is connected, and AC-DC conversion module (12) is connected with AD conversion module (13), AD conversion module (13) and MCU
(1) it is connected.
5. ground resistance state evaluation according to claim 3 and on-line early warning cloud monitoring system, which is characterized in that described
Signal generating unit includes signal generating module (2), and signal generating module (2) is connected with MCU(1), signal generating module (2)
It is connected with Current Voltage conversion module I (3), Current Voltage conversion module I (3) is connected with signal amplification module (4), signal
Amplification module (4) is connected with signal selection module (5), and signal selection module (5) is connected with power amplifier module (6), function
Rate amplification module (6) is connected with voltage transformer (7).
6. ground resistance state evaluation according to claim 1 and on-line early warning cloud monitoring system, which is characterized in that described
Communication module (18) is GPRS communication module.
7. ground resistance state evaluation according to claim 1 and on-line early warning cloud monitoring system, which is characterized in that described
Voltage transformer (7) and current transformer (8) are respectively annular voltage transformer and ring current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933650.4A CN110514903A (en) | 2019-09-29 | 2019-09-29 | Ground resistance state evaluation and on-line early warning cloud monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933650.4A CN110514903A (en) | 2019-09-29 | 2019-09-29 | Ground resistance state evaluation and on-line early warning cloud monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110514903A true CN110514903A (en) | 2019-11-29 |
Family
ID=68633993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910933650.4A Pending CN110514903A (en) | 2019-09-29 | 2019-09-29 | Ground resistance state evaluation and on-line early warning cloud monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110514903A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351988A (en) * | 2019-12-29 | 2020-06-30 | 武昌首义学院 | Intelligent tower grounding resistance measuring system and method based on mobile internet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680798A (en) * | 2012-02-28 | 2012-09-19 | 山东建筑大学 | Online measurement method and device for grounding resistor of rod tower |
| KR101795617B1 (en) * | 2017-07-10 | 2017-11-08 | 에스엠인스트루먼트 주식회사 | A realtime measuring device for multi earthing resistence |
| CN107656144A (en) * | 2017-11-14 | 2018-02-02 | 国网山东省电力公司电力科学研究院 | A kind of comprehensive detection system and method for transmission line of electricity earthed system |
| CN107782975A (en) * | 2017-09-19 | 2018-03-09 | 山东建筑大学 | Distributed grounding resistance detection system and detection method based on radio signal source |
| CN210803587U (en) * | 2019-09-29 | 2020-06-19 | 国网河南省电力公司濮阳供电公司 | Online ground resistance in-situ detection terminal |
-
2019
- 2019-09-29 CN CN201910933650.4A patent/CN110514903A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680798A (en) * | 2012-02-28 | 2012-09-19 | 山东建筑大学 | Online measurement method and device for grounding resistor of rod tower |
| KR101795617B1 (en) * | 2017-07-10 | 2017-11-08 | 에스엠인스트루먼트 주식회사 | A realtime measuring device for multi earthing resistence |
| CN107782975A (en) * | 2017-09-19 | 2018-03-09 | 山东建筑大学 | Distributed grounding resistance detection system and detection method based on radio signal source |
| CN107656144A (en) * | 2017-11-14 | 2018-02-02 | 国网山东省电力公司电力科学研究院 | A kind of comprehensive detection system and method for transmission line of electricity earthed system |
| CN210803587U (en) * | 2019-09-29 | 2020-06-19 | 国网河南省电力公司濮阳供电公司 | Online ground resistance in-situ detection terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351988A (en) * | 2019-12-29 | 2020-06-30 | 武昌首义学院 | Intelligent tower grounding resistance measuring system and method based on mobile internet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105988063B (en) | A kind of comprehensive on-line monitoring method of transmission line malfunction hidden danger and device | |
| CN106556766A (en) | A kind of distribution network failure monitoring system based on distribution line multidate information | |
| CN106569089A (en) | Power distribution line dynamic Information-based power distribution network fault monitoring method | |
| CN106597213B (en) | Distributed electric line upkeep operation safeguard protection digitized monitoring system | |
| CN109521335A (en) | It is a kind of to take the high-voltage cable insulating state on-line detecting system that powered based on self-induction | |
| WO2014154164A1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN108362950A (en) | A kind of thunder and lightning intelligent monitor system | |
| CN204269739U (en) | Based on thunderbolt diagnosis and the real time warning device of leakage conductor | |
| CN106526288A (en) | Transmission line voltage and current monitoring system and method | |
| CN103366479B (en) | The tamper-proof theft protection long-distance monitorng device of transformer | |
| CN108107328A (en) | A kind of transformer substation monitoring system | |
| CN105527499A (en) | Grounding resistance detection and analysis system with automatic alarm function | |
| CN107478909A (en) | A kind of smart grounding resistance on-line computing model and its system | |
| CN110246054A (en) | A kind of intelligent electricity anti-theft total management system and method | |
| CN209690443U (en) | A kind of high-voltage cable insulating state on-line detecting system | |
| CN110514903A (en) | Ground resistance state evaluation and on-line early warning cloud monitoring system | |
| CN103941160B (en) | Power distribution network loop closing detection device and method | |
| CN201724969U (en) | Intelligent measurement display device of switch cabinet | |
| CN203071655U (en) | Comprehensive monitoring device for switch cabinet of electric power system | |
| CN107490748A (en) | A kind of overhead transmission line lightning monitoring device based on snap ring power taking technology | |
| CN106526428A (en) | 0.4kV low-voltage distribution line on-line monitoring system | |
| CN208334541U (en) | A kind of portable power distribution line fault positioner | |
| CN103439550A (en) | Electricity stealing prevention device capable of being mounted in electrified mode and mounting method thereof | |
| CN109188098A (en) | A kind of ground resistance on-line monitoring management system | |
| CN110514904A (en) | Insulating resistance measuring early warning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |