CN207571291U - A kind of voltage transformer secondary neutral ground line on-line measuring device - Google Patents
A kind of voltage transformer secondary neutral ground line on-line measuring device Download PDFInfo
- Publication number
- CN207571291U CN207571291U CN201721403157.4U CN201721403157U CN207571291U CN 207571291 U CN207571291 U CN 207571291U CN 201721403157 U CN201721403157 U CN 201721403157U CN 207571291 U CN207571291 U CN 207571291U
- Authority
- CN
- China
- Prior art keywords
- module
- processing module
- microcomputer processing
- input
- measuring device
- 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.)
- Expired - Fee Related
Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 41
- 238000012545 processing Methods 0.000 claims abstract description 57
- 230000003321 amplification Effects 0.000 claims abstract description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000003068 static effect Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000033746 Device malfunction events Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000008521 reorganization Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model is related to power supply safety detection fields, more specifically, it is related to a kind of voltage transformer secondary neutral ground line on-line measuring device, including current transformer, acquisition module, amplification module, data conversion module and the MICROCOMPUTER PROCESSING module being sequentially connected.First output terminal of MICROCOMPUTER PROCESSING module is connected with alarm output unit module, the second output terminal of MICROCOMPUTER PROCESSING module is connected separately with alarm lamp and display module, the third output terminal of MICROCOMPUTER PROCESSING module is connected with storage unit module, the first input end of MICROCOMPUTER PROCESSING module is connected with the module that automatically resets, definite value module is adjusted in module during the second input terminal connection pair of MICROCOMPUTER PROCESSING module, the third input terminal connection of MICROCOMPUTER PROCESSING module.The utility model is simple in structure, can effectively detect power plant transformer voltage mutual inductor secondary neutral ground wire multipoint earth faults, send out alarm signal, and relevant information is passed to main website server.
Description
Technical field
The utility model is related to power supply safety detection field, more particularly, to a kind of voltage transformer secondary neutral point
It is grounded on-line measuring device.
Background technology
According to《Relay protection of power system and automatic safety device anti-accident measures main points》Regulation：It is mutually small through control room zero
Several groups of Secondary Circuit of Potential Transformer of busbar (N600) connection, only should be in control room by N600 one point earths, and each voltage is mutual
Sensor secondary neutral should be disconnected in switch place earth point；To ensure that ground connection is reliable, the neutral conductor of each voltage transformer must not
It is connected to the breaker that may be disconnected or contactor etc..
In actual operation, design, construct and secondary device aging, insulation breakdown due to, voltage may be caused mutual
There are 2 points (or multiple spots) to be grounded by sensor secondary neutral N600, exists and is grounded simultaneously in switch place ground connection and control room, when
System jam, substation ground network flow through major break down electric current, and at this moment N600 both ends will appear potential difference, will cause neutral point
Voltage-phase deviates, and then influences phase voltage and the amplitude and phase of residual voltage.It is thus possible to lead to distance protection, zero sequence
Direction protection tripping or malfunction.Thus it is guaranteed that voltage transformer secondary N600 circuits one point earth seems extremely important.
Power Plant Substation (plant stand) occurred several times due to protecting voltage transformer secondary neutral point N600 multipoint earthings
Cause 220kV and more than protective device malfunction event, the generation again of such event, takes following measures in order to prevent：
1) constituent parts should check administrative plant stand Secondary Circuit of Potential Transformer N600 Groundings；
2) operation and maintenance unit should be before newly-built plant stand puts into operation, neutral point N600 one point earth situations of conscientiously inspecting for acceptance,
Ensure that design drawing and related second loop return wiring are correct, and neutral point N600 is grounded test data file for future examination；
3) plant stand of reorganization and expansion is before putting equipment in service, it is necessary to N600 common ground line currents be tested and record number
According to；
4) running plant stand, operator should carry out the test of a N600 ground connection line current value, hair every half a year
Existing multipoint earthing vertical must check the earth fault excluded other than N600.
Therefore, inspection, the operation management of plant stand voltage transformer secondary neutral point N600 is that relay protection of power system is special
Industry is periodically manually patrolled an important content of test, however, plant stand voltage transformer secondary neutral point N600 ground wires do not have
The method of relevant real-time online detection, it is mutual for plant stand voltage by analytical judgment usually after false protection occurs for power grid
Sensor secondary neutral multipoint earthing, imperfect earth, wiring error cause, and majority is postmortem, fails to scent a hidden danger in time；
Meanwhile relay protection maintenance personnel inspection needs to consume the plenty of time, plant stand is investigated one by one, and heavy workload, arbitrariness is also big for operation,
Routing inspection efficiency is low, and inspection testing result is inaccurate, may not pinpoint the problems, but during thunderstorm (such as TYD when checking
N600 breakdown fuse conductings etc.) multipoint earthing is formed, it can be just found when accident occurs.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind voltage transformer secondary neutral point
It is grounded on-line measuring device.
In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of voltage transformer secondary is neutral
Point ground wire on-line measuring device, at current transformer, acquisition module, amplification module, data conversion module and microcomputer
Module is managed, the current transformer, acquisition module, amplification module, data conversion module and MICROCOMPUTER PROCESSING module are sequentially connected,
It is characterized in that：First output terminal of the MICROCOMPUTER PROCESSING module is connected with alarm output unit module, the MICROCOMPUTER PROCESSING mould
The second output terminal of block is connected separately with alarm lamp and display module, and the third output terminal of the MICROCOMPUTER PROCESSING module connects
Storage unit module is connected to, the first input end of the MICROCOMPUTER PROCESSING module is connected with the module that automatically resets, the MICROCOMPUTER PROCESSING
Module when second input terminal of module is connected with pair, the third input terminal of the MICROCOMPUTER PROCESSING module are connected with fixed value adjusting mould
Block, the alarm output unit module are also associated with public measure and control device.
Preferably, the current transformer acquires the analog current of ground wire and analog current is input to acquisition module；
The acquisition module is input to amplification module after the analog current value of input is carried out signal processing；The amplification module includes the
Once-through operation amplifier and second of operational amplifier, the amplification module are used for defeated after the analog current inputted is amplified
Enter to data conversion module；Preferably, the data conversion module is used to amplified analog current being converted into digital letter
Number and be input to MICROCOMPUTER PROCESSING module.
Preferably, the microcomputer MICROCOMPUTER PROCESSING module includes logic analysis module and arbitration functions module.
Preferably, described pair when module and fixed value adjusting module, input microcomputer MICROCOMPUTER PROCESSING module.
Preferably, the storage unit module is used to store, inquire nearest fault message.
Preferably, the module that automatically resets includes relay K1, relay K2, involution button S, protection component
R1, protection component R2, protection component R3, power supply E and the alarm lamp L.The protection component R1, relay
The normally opened static contacts of device K1, alarm lamp L are sequentially connected, and the protection component R1, the normally opened static contacts of relay K1, alarm refer to
Show that lamp L forms first group of series circuit；The protection component R2, involution button S are sequentially connected, the protection component
R2, involution button S form second group of series circuit；The protection component R3 is connected with the normally closed static contacts of relay K2, described
Protect the normally closed static contact composition third group series circuits of the component R3 and relay K2；First group of series circuit,
Second group of series circuit and third group series circuit are connected in parallel on respectively on the power supply E.
Preferably, public measure and control device includes monitoring backstage signal alarm module and telemechanical scheduling station detection module.
The collected electric current of on-line measuring device is more than alarm setting current definite value, is judged as multipoint earthing, micro treatment module triggering after
Electric appliance K1 coil motions, the normally opened nodes of relay K1 are closed, the N600 multipoint earthings of triggering control loop to public measure and control device
Alarm signal is closed, and monitoring backstage machine alarm window is lit, alerts window pop-up " N600 multipoint earthings " warning information.
Meanwhile multipoint earthing threadiness condition is occurred for Power Plant Substation voltage transformer secondary neutral point N600 by telemechanical in standing
Scheduling station monitoring system, perfect Power Plant Substation neutral point N600 ground wire online test methods and device are sent in time
It is contacted with scheduling station monitoring system, on-line measuring device will acquire, the detection state of identification is uploaded by telemechanical apparatus in station
To scheduling station server, realize accurately and efficiently to Power Plant Substation voltage transformer secondary neutral point N600 ground wires
Detection in real time.
Preferably, power supply processing module, the power supply processing module and the acquisition module, amplification mould are further included
Block, data conversion module and MICROCOMPUTER PROCESSING module are connected.Power supply processing module is to provide the Power Plant Substation voltage
Mutual inductor secondary neutral N600 is grounded the working power of on-line measuring device, using plant stand DC power supply (110V or 220V)
The stable operation of ensuring equipment working condition.
Compared with prior art, the beneficial effects of the utility model are：
The utility model is a kind of voltage transformer secondary neutral ground line on-line measuring device, passes through Current Mutual Inductance
Device, acquisition module, amplification module, data conversion module, MICROCOMPUTER PROCESSING module, the module that automatically resets, storage unit module, pair when
The setting of module, fixed value adjusting module and alarm output unit is realized to substation power station neutral ground line current
Always Online" detection function；The setting for the module that automatically resets simultaneously, which has, resets relay K1 coil motions, makes in report
Device under alert state is restored to on-line checking working condition；Monitoring backstage signal alarm module and the detection of telemechanical scheduling station
The detection state being provided with conducive to that will acquire, identify of module is uploaded to scheduling station server by telemechanical apparatus in station, real
The now accurate and efficiently real-time detection to Power Plant Substation voltage transformer secondary neutral point N600 ground wires.
Description of the drawings
Fig. 1 is a kind of module map of voltage transformer secondary neutral ground line on-line measuring device of the utility model；
Fig. 2 is to alert to control back in a kind of voltage transformer secondary neutral ground line on-line measuring device of the utility model
Road circuit diagram；
Fig. 3 is a kind of voltage transformer secondary neutral ground line on-line measuring device surface structure main view of the utility model
Figure；
Fig. 4 is a kind of voltage transformer secondary neutral ground line on-line measuring device surface structure backsight of the utility model
Figure；
Fig. 5 is that a kind of flow of voltage transformer secondary neutral ground line on-line measuring device of the utility model is illustrated
Figure.
Specific embodiment
The utility model is further described With reference to embodiment.Wherein, being given for example only property of attached drawing
Illustrate, expression is only schematic diagram rather than pictorial diagram, it is impossible to be interpreted as the limitation to this patent；In order to which this reality is better described
With novel embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To ability
For field technique personnel, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the utility model embodiment；In this practicality
In novel description, it is to be understood that if thering is the orientation of the instructions such as term " on ", " under ", "left", "right" or the position relationship to be
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description rather than instruction
Or imply that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore retouched in attached drawing
State the term of position relationship only for illustration, it is impossible to the limitation to this patent is interpreted as, for the common skill of this field
For art personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiment
Fig. 1 to Fig. 5 is the first of a kind of voltage transformer secondary neutral ground line on-line measuring device of the utility model
Embodiment, including current transformer 1, acquisition module 2, amplification module 3, data conversion module 4 and MICROCOMPUTER PROCESSING module 5, electricity
Current transformer 1, acquisition module 2, amplification module 3, data conversion module 4 and MICROCOMPUTER PROCESSING module 5 are sequentially connected, MICROCOMPUTER PROCESSING
First output terminal of module 5 is connected with alarm output unit module 6, and the second output terminal of MICROCOMPUTER PROCESSING module 5 is connected separately with
Alarm lamp 11 and display module 12, the third output terminal of MICROCOMPUTER PROCESSING module 5 are connected with storage unit module 14, microcomputer
The first input end of processing module 5 is connected with the module 7 that automatically resets, when the second input terminal of MICROCOMPUTER PROCESSING module 5 is connected with pair
Module 15, the third input terminal of MICROCOMPUTER PROCESSING module 5 are connected with fixed value adjusting module 16, and alarm output unit module 6 is also connected with
There is public measure and control device 8.
Wherein, current transformer 1 acquires the analog current of ground wire and analog current is input to acquisition module 2；Acquisition
Module 2 is input to amplification module 3 after the analog current value of input is carried out signal processing；Amplification module 3 includes first time operation
Amplifier and second of operational amplifier, amplification module 3 are used to be input to data conversion after the analog current of input is amplified
Module 4；Data conversion module 4 is used to amplified analog current being converted into digital signal and is input to MICROCOMPUTER PROCESSING module 6.
In addition, microcomputer MICROCOMPUTER PROCESSING module 6 includes logic analysis module and arbitration functions module.
Wherein, pair module 15 and fixed value adjusting module 16 are input into microcomputer MICROCOMPUTER PROCESSING module when.
In addition, the output connection storage unit of MICROCOMPUTER PROCESSING module 6 module 14 is used to store, inquire nearest fault message.
Wherein, the module that automatically resets includes relay K1, relay K2, involution button S, protection component R1, protection member
Device R 2, protection component R3, power supply E and the alarm lamp L；Protect component R1, the normally opened stationary contacts of relay K1
Piece, alarm lamp L are sequentially connected, and protection component R1, the normally opened static contacts of relay K1, alarm lamp L form first group
Series circuit；Protection component R2, involution button S are sequentially connected, and protection component R2, involution button S form the second string formation connection
Circuit；Protection component R3 is connected with the normally closed static contacts of relay K2, protection component R3 and the normally closed static contact groups of relay K2
Into third group series circuit；First group of series circuit, second group of series circuit and third group series circuit are connected in parallel on electricity respectively
On the E of source.
In the present embodiment, R1, R2, R3 one kind in the related protection element (resistance, inductance, capacitance) in circuit in order to control
Or it is a variety of, K1, K2 are relay, and L is alarm indicator, and S is involution mould involution button in the block.Neutral point N600 is examined online
Survey the alarm control operation principle of device：The plant stand voltage transformer neutral point acquired by high-precision split core type current transformer 1
N600 is grounded line current, and analog quantity current value progress signal processing will be inputted by being input to acquisition module 2, and interference volume is removed, is located
Amplification module 3 will be inputted after reason, A/D data conversion modules 4 are input to after two-stage amplifying circuit, pass through A/D data conversions
Computer processor module 5 is input to after module 4, microprocessor carries out logic judgment, when acquisition electric current is more than MICROCOMPUTER PROCESSING module
Definite value (50mA) is adjusted, by certain Time-delayed trigger relay K1, relay K1 action, relay K1 action normal opened contacts close
Conjunction triggering leads to the signal contact of public measure and control device, and monitoring backstage alarm window is lit, alerts the related alarm " neutrality of window pop-up
Point N600 multipoint earthings " information；Meanwhile another pair normal opened contact of relay K1 is closed, the action of trigger device alarm module, letter
Signal lamp is lighted, while is stored and constantly stored relevant action information.Involution button S is acted, trigger relay K2, device slot signal
Alarm and relay K1, device restore normal operating conditions.
In addition, public measure and control device 8 includes monitoring backstage signal alarm module 9 and telemechanical scheduling station detection module
10, the voltage transformer secondary neutral point N600 multipoint earthing works that Power Plant Substation occurs telemechanical scheduling station monitoring system
Make, message form is presented, pops up related " plant stand N600 multipoint earthings " information.
Wherein, the present apparatus further includes power supply processing module 13, power supply processing module 13 and the acquisition module 2, amplification
Module 3, data conversion module 4 and MICROCOMPUTER PROCESSING module 5 are connected, while relay is defeated during installation's power source processing module failure
Go out passive alarm contact.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made within the spirit and principles of the present invention etc., should be included in
Within the protection domain of the utility model claims.
Claims (8)
1. a kind of voltage transformer secondary neutral ground line on-line measuring device, including current transformer（1）, acquisition module
（2）, amplification module（3）, data conversion module（4）And MICROCOMPUTER PROCESSING module（5）, the current transformer（1）, acquisition module
（2）, amplification module（3）, data conversion module（4）And MICROCOMPUTER PROCESSING module（5）It is sequentially connected, it is characterised in that：It is described micro-
Machine processing module（5）The first output terminal be connected with alarm output unit module（6）, the MICROCOMPUTER PROCESSING module（5）Second
Output terminal is connected separately with alarm lamp（11）And display module（12）, the MICROCOMPUTER PROCESSING module（5）Third output
End is connected with storage unit module（14）, the MICROCOMPUTER PROCESSING module（5）First input end be connected with the module that automatically resets
（7）, the MICROCOMPUTER PROCESSING module（5）The second input terminal module when being connected with pair（15）, the MICROCOMPUTER PROCESSING module（5）
Three input terminals are connected with fixed value adjusting module（16）, the alarm output unit module（6）It is also associated with public measure and control device
（8）.
2. voltage transformer secondary neutral ground line on-line measuring device according to claim 1, it is characterised in that：It is described
Current transformer（1）It acquires the analog current of ground wire and analog current is input to acquisition module（2）；
The acquisition module（2）Amplification module is input to after the analog current value of input is carried out signal processing（3）；
The amplification module（3）Including first time operational amplifier and second of operational amplifier, the amplification module（3）
For data conversion module will to be input to after the amplification of the analog current of input（4）；
The data conversion module（4）For amplified analog current to be converted into digital signal and is input to MICROCOMPUTER PROCESSING
Module（5）.
3. voltage transformer secondary neutral ground line on-line measuring device according to claim 2, it is characterised in that：It is described
MICROCOMPUTER PROCESSING module（5）Including logic analysis module and arbitration functions module.
4. voltage transformer secondary neutral ground line on-line measuring device according to claim 3, it is characterised in that：It is described
Pair when module（15）With fixed value adjusting module（16）It is input into MICROCOMPUTER PROCESSING module（5）.
5. voltage transformer secondary neutral ground line on-line measuring device according to claim 1, it is characterised in that：It is described
Storage unit module（14）For storing, inquiring nearest fault message.
It is 6. special according to claim 3 to 5 any one of them voltage transformer secondary neutral ground line on-line measuring device
Sign is：The module that automatically resets includes relay K1, relay K2, involution button S, protection component R1, the first device of protection
Part R2, protection component R3, power supply E and the alarm lamp L；
The protection component R1, the normally opened static contacts of relay K1, alarm lamp L are sequentially connected, the protection component R1,
The normally opened static contacts of relay K1, alarm lamp L form first group of series circuit；
The protection component R2, involution button S are sequentially connected, and the protection component R2, involution button S form second group
Series circuit；
The protection component R3 is connected with the normally closed static contacts of relay K2, and the protection component R3 and relay K2 is normal
Close static contact composition third group series circuit；
First group of series circuit, second group of series circuit and the third group series circuit is connected in parallel on the power supply E respectively
On.
7. voltage transformer secondary neutral ground line on-line measuring device according to claim 6, it is characterised in that：Institute
The public measure and control device stated（8）Including monitoring backstage signal alarm module（9）And telemechanical scheduling station detection module（10）.
8. voltage transformer secondary neutral ground line on-line measuring device according to claim 7, it is characterised in that：Also
Including power supply processing module（13）, the power supply processing module（13）With the acquisition module（2）, amplification module（3）, number
According to modular converter（4）And MICROCOMPUTER PROCESSING module（5）It is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721403157.4U CN207571291U (en) | 2017-10-27 | 2017-10-27 | A kind of voltage transformer secondary neutral ground line on-line measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721403157.4U CN207571291U (en) | 2017-10-27 | 2017-10-27 | A kind of voltage transformer secondary neutral ground line on-line measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207571291U true CN207571291U (en) | 2018-07-03 |
Family
ID=62692714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721403157.4U Expired - Fee Related CN207571291U (en) | 2017-10-27 | 2017-10-27 | A kind of voltage transformer secondary neutral ground line on-line measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207571291U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655661A (en) * | 2019-02-21 | 2019-04-19 | 广东电网有限责任公司 | The voltage check device and method of substation |
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110716075A (en) * | 2019-10-10 | 2020-01-21 | 西安科技大学 | Current transformer array switching circuit and control method |
| CN114217167A (en) * | 2021-12-06 | 2022-03-22 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Distributed voltage transformer secondary circuit N600 grounding current detection system |
-
2017
- 2017-10-27 CN CN201721403157.4U patent/CN207571291U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655661A (en) * | 2019-02-21 | 2019-04-19 | 广东电网有限责任公司 | The voltage check device and method of substation |
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110196345B (en) * | 2019-07-09 | 2024-06-04 | 国网宁夏电力有限公司宁东供电公司 | Secondary neutral point protection device of voltage transformer |
| CN110716075A (en) * | 2019-10-10 | 2020-01-21 | 西安科技大学 | Current transformer array switching circuit and control method |
| CN114217167A (en) * | 2021-12-06 | 2022-03-22 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Distributed voltage transformer secondary circuit N600 grounding current detection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10794945B2 (en) | Method for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| EP2985613B1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN203490313U (en) | PT secondary loop multi-point grounding alarming and positioning system | |
| CN101551432B (en) | Power distribution network fault positioning method | |
| CN207571291U (en) | A kind of voltage transformer secondary neutral ground line on-line measuring device | |
| CN104076243B (en) | A kind of small current neutral grounding one-phase earthing failure in electric distribution network detection indicating means and equipment | |
| CN102590700A (en) | Method and device for quickly locating faults of overhead line on basis of time synchronization | |
| CN104779595B (en) | Distribution two level earth leakage protective monitoring system | |
| CN103344809A (en) | Measuring equipment and measuring method for leakage currents of high-voltage holding test of security equipment | |
| CN109274177A (en) | Power distribution station safety utilization of electric power monitoring system and monitoring method | |
| CN101776723B (en) | Method for detecting earth fault of direct current system by utilizing frequency deviation method | |
| CN202735448U (en) | Multipoint grounding monitoring device | |
| Uddin et al. | Detection and locating the point of fault in distribution side of power system using WSN technology | |
| CN104614603B (en) | On-site protection device status detection system and detection method thereof | |
| CN101750540B (en) | Method for detecting parasitic loop of transformer station direct current system | |
| CN103487725A (en) | Overhead distributing line ground fault indicating device based on zero-sequence component method | |
| CN112162179B (en) | Power distribution network line fault positioning method and system | |
| CN202676825U (en) | Electrical and communication system grounding safety monitoring alarm device | |
| CN105182157A (en) | Neutral point multi-point grounding detection device based on high-accuracy detection current | |
| Lebedev et al. | Development of a method for location of a damaged overhead power line section in case of single-phase earth faults | |
| CN203587736U (en) | Overhead distributing line ground fault indicating device based on zero-sequence component method | |
| CN202433480U (en) | Fast fault location device of overhead lines based on time synchronization | |
| CN206541018U (en) | A kind of multipoint grounding seeking instrument of voltage transformer | |
| CN106841920B (en) | The judgement of distribution line real time fail and Fault Locating Method | |
| CN203350385U (en) | Direct current system parasitic circuit on-line detection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180703 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |