CN209070019U - A kind of loop resistance test macro under double ground states - Google Patents
A kind of loop resistance test macro under double ground states Download PDFInfo
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- CN209070019U CN209070019U CN201821533826.4U CN201821533826U CN209070019U CN 209070019 U CN209070019 U CN 209070019U CN 201821533826 U CN201821533826 U CN 201821533826U CN 209070019 U CN209070019 U CN 209070019U
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Abstract
The utility model discloses the loop resistance test macros under a kind of double ground states, including control cabinet, the single-chip microcontroller being arranged in inside control cabinet and constant-current source, setting in the positive I of control cabinet+Terminal, I‑Terminal, V+Terminal, V‑Terminal and sensor input socket and the flexible Hall sensor being connected on sensor input socket；The connection of the control terminal of single-chip microcontroller and constant-current source, I+Terminal and I‑Terminal is connect with the output end of constant-current source respectively, I+Terminal and I‑Terminal is also connect by current output line with the both ends of tested device galvanic circle respectively；V+Terminal, V‑Terminal and sensor input socket are connect with single-chip microcontroller respectively, V+Terminal and V‑Terminal is also connect by voltage tester line with the both ends of tested device galvanic circle respectively, and flexible Hall sensor is mounted on tested device galvanic circle or interference circuit.The utility model can constantly draw, continuous grounding switch in the case where loop resistance value true and that accurately measure various breakers, disconnecting switch.
Description
Technical field
The utility model relates to the loop resistance test macros under a kind of double ground states.
Background technique
GIS (gas insulated metal enclosed switch gear) means gas-insulated metal enclosed switchgear
Equipment, it is by breaker, disconnecting switch, earthing switch, arrester, voltage transformer, current transformer, casing and bus etc.
The combined electrical apparatus that element is directly bound up.Due to GIS have it is compact-sized, occupied area and space are few, and operational safety can
It leans on, installation, the advantages that maintenance workload is small have been more and more widely used in recent years.Contact Resistance of Circuit Breaker is disconnected
One of the main project of road device preventive trial, if the contact resistance of GIS device increases, increase equipment conductor be powered when
Loss, increases the temperature of contact position, the current-carrying capability when size of value will directly affect normal work, and measures conductive time
Road resistance can be found that the defect in GIS device galvanic circle whether there is or not poor contact.Therefore, in order to check GIS manufacture, installation,
Repair quality and the running general level of the health, in delivery test, commissioning test and preventive trial, all defining must be measured
The D.C. resistance of galvanic circle.
The current tester for loop resistance test, its working principle is that direct current pressure drop method.Measured resistance is applied straight
Galvanic electricity stream, added test electric current be can automatic constant 100 amperes direct currents, the pressure drop at both ends adopts inside instrument after tested
After sample conversion, resistance value is directly shown by digital form.Before measurement, the disconnecting switch of GIS device is separated first, with electro-mechanical part
Code insurance holds apparent cut-off point；Secondly, breaker and breaker two sides grounding switch are closed；Again, grounding switch is led
Connecting copper bar between body exit and ground is removed；It is flanked finally, connecing respectively at circuit resistance tester both ends in breaker two
The conductor exit of ground disconnecting link, split-phase measure.
But there are problems for above-mentioned measurement process: in annual overhaul, each working face cross-operation is necessary in many cases
Guarantee that equipment two sides are grounded, still, current circuit resistance tester only allows to be devices under one end ground connection, when tested
Loop resistance measurement can not be carried out when equipment two-terminal-grounding.In addition, when tested device nearby charges, due to faradic presence,
Do not allow equipment ground disconnecting link to pull open, can not carry out loop resistance test to equipment at this time yet yet.Simultaneously for super (spy) high pressure
The direct current field device of direct current transportation, coupling part are provided with large scale grading ring, disconnected to draw that there are great difficulties, can also make when drawing again
The deformation of Cheng Yici terminal board, the risk of equipment damage.For GIS (HGIS) structure, circuit electricity is carried out to breaker, disconnecting switch
When resistance test, needs the ground connection band iron by grounding switch one end (or both ends) to dismantle, not only substantially increase workload, cause
The prerun duration is nervous, also adds the fever risk after drawing again, carrys out security risk to equipment belt.
Utility model content
For problem of the prior art, the utility model provides the loop resistance test macro under a kind of double ground states,
It can exclude earth current to shunt on loop resistance test bring influence, make equipment in the case where double ground connection, constantly drawing
Loop resistance can be measured, guarantee the safety and stability of equipment.
To achieve the above object, the technical scheme adopted by the utility model is
Loop resistance test macro under a kind of double ground states, including control cabinet, the monolithic being arranged in inside control cabinet
Machine and constant-current source, setting in the positive I+ terminal of control cabinet, I- terminal, V+ terminal, V- terminal and sensor input socket and
The flexible Hall sensor being connected with sensor input socket；The connection of the control terminal of single-chip microcontroller and constant-current source, I+ terminal and the end I-
Son is connect with the output end of constant-current source respectively, and I+ terminal and I- terminal are also returned by current output line and tested device conduction respectively
The both ends on road connect；V+ terminal, V- terminal and sensor input socket are connect with single-chip microcontroller respectively, and V+ terminal and V- terminal also divide
Not Tong Guo voltage tester line connect with the both ends of tested device galvanic circle, flexible Hall sensor be mounted on tested device conduction
On circuit or interference circuit；The front of the control cabinet is additionally provided with the switching switch connecting with single-chip microcontroller, which switchs basis
The measurement pattern of the installation site switching single-chip microcontroller of flexible Hall sensor.
Further, the front of the control cabinet is equipped with the power switch, start button, stopping connecting with single-chip microcontroller and presses
Button and liquid crystal display.
Further, it is defeated to be additionally provided with the printer, ground terminal, power supply connecting with single-chip microcontroller for the front of the control cabinet
Enter socket and RS-232 interface.
It further, further include a sample circuit, which includes being connected to constant-current source and I+Taking between terminal
Sample resistance and the amplifier and A/D converter one for being connected to sample resistance both ends, amplifier and A/D converter one and single-chip microcontroller connect
It connects.Single-chip microcontroller is sampled according to output electric current of the sample circuit to constant-current source, to accurately control the output of constant-current source.
It further, further include amplifier and A/D converter two, V+Terminal, V-Terminal and sensor interface pass through amplification
Device and A/D converter two are connect with single-chip microcontroller.For being sampled to the electric current by tested device galvanic circle, to calculate
The resistance value of galvanic circle.
A kind of loop resistance test macro under double ground states of the utility model, may be used on open type breaker and
GIS device Contact Resistance of Circuit Breaker test in, can constantly draw, continuous grounding switch in the case where really and accurately survey
The loop resistance value of various breakers, disconnecting switch is measured, so that the entire test process of safe and efficient completion, can greatly mention
High working efficiency, reduces work risk, and the effective quality and speed for improving test is saved plenty of time and cost, and improved
The accuracy of test result.Compared with prior art, it has the advantages that
1, without dismantling the ground connection band iron of GIS grounding switch one end (or both ends), avoid the fever risk after drawing again and
The security risk on ground is missed in equipment working earthing, is improved work efficiency and safety.
2, without pulling open open type circuit interrupter grounding disconnecting link, induced electricity is avoided to the personal risk of operating personnel, is guaranteed
Operation safety.
3, using flexible Hall sensor, it is applicable to different GIS device and open type breaker, it is easy for installation.
4, sampling and double ground connection are converted using A/D, avoids influence of the induced electricity to test result, improves test result
Accuracy.
5, pattern switching is measured using key, is suitable for GIS device and open type breaker, there is universality.
Detailed description of the invention
Fig. 1 is the schematic illustration of the utility model loop resistance test macro；
Fig. 2 is the positive structure schematic of the utility model control cabinet；
Fig. 3 is that wiring when the utility model loop resistance test macro carries out loop resistance test to GIS breaker is shown
It is intended to；
Fig. 4 is wiring when the utility model loop resistance test macro carries out loop resistance test to open type breaker
Schematic diagram.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
As illustrated in fig. 1 and 2, the loop resistance test macro under a kind of double ground states of the utility model, including control
Case 100, the single-chip microcontroller 200 being arranged in inside control cabinet 100 and constant-current source 300 and the flexibility being arranged in outside control cabinet 100
Hall sensor 400.
The front of control cabinet 100 is equipped with power switch 1, switching switch 2, start button 3, stop button 4, liquid crystal display
5, printer 6, I+Terminal 7, V+Terminal 8, I- terminal 9, V- terminal 10, sensor input socket 11, ground terminal 12, power supply are defeated
Enter socket 13 and RS-232 interface 14.
Inside control cabinet 100, single-chip microcontroller 200 is connect with the control terminal of constant-current source 300；I+Terminal 7 and I- terminal 9 are distinguished
It is connect with the output end of constant-current source 300；In constant-current source 300 and I+Sample resistance 500 is equipped between terminal 7, sample resistance 500
Both ends are connect by amplifier and A/D converter 1 with single-chip microcontroller 200, sample resistance 500 and amplifier and A/D converter
One 600 constitute a sample circuit, are sampled for the output electric current to constant-current source 300, so that single-chip microcontroller 200 can be accurate
Control the output electric current of constant-current source 300；V+Terminal 8, V- terminal 10 and sensor input socket 11 are turned by amplifier and A/D
Parallel operation 2 700 is connect with single-chip microcontroller 200, for 800 galvanic circle of tested device electric current and voltage be sampled；Power supply is opened
Close 1, switching switch 2, start button 3, stop button 4, liquid crystal display 5, printer 6, ground terminal 12, power input socket
13 and RS-232 interface 14 connect with single-chip microcontroller 200.
Outside control cabinet 100, flexible Hall sensor 400 is for being mounted on 800 galvanic circle of tested device or interference
On circuit, and it is connected on sensor input socket 11 by conducting wire；I+Terminal 7 and I- terminal 9 are defeated by the electric current of Band clamp
Outlet 21 is connect with the both ends of 800 galvanic circle of tested device；V+Terminal 8 and V- terminal 10 pass through the voltage tester line of Band clamp
22 connect with the both ends of 800 galvanic circle of tested device；There are two types of the mounting means of flexible Hall sensor 400, respectively interior
Connection and method for externally, inscribed methods refer to that flexible Hall sensor 400 is located at I+The inside of terminal 7 and 800 tie point of tested device,
I.e. flexible Hall sensor 400 is mounted on 800 galvanic circle of tested device, and method for externally refers to flexible Hall sensor 400
In I+The outside of terminal 7 and 800 tie point of tested device, i.e., flexible Hall sensor 400 are mounted on conductive with tested device 800
On loop-coupled interference circuit, inscribed methods are typically chosen to GIS device, the open type breaker of double ground connection are typically chosen outer
Connection；Switch switch 2 then according to the mounting means of flexible Hall sensor 400, switches the measurement pattern of single-chip microcontroller 200, measurement
Mode includes internal wiring 10s, internal wiring 60s, external connection 10s, (10s refers to that the time of electric current output is 10s, 60s to external connection 60s
The time for referring to electric current output is 60s), it is defeated by setting time to control constant-current source 300 according to selected measurement pattern for single-chip microcontroller 200
Electric current out measures the resistance of 800 galvanic circle of tested device, and is shown by liquid crystal display 5.
Constant-current source 300 is that tested device 800 applies constant DC current；V+Terminal 8 and V- terminal 10 are for obtaining quilt
Try the voltage of 800 galvanic circle of equipment；V+Terminal 8 and flexible Hall sensor 400 are for obtaining 800 galvanic circle of tested device
Electric current；Control processing center of the single-chip microcontroller 200 as this system measures tested device using existing direct current pressure drop principle
The resistance of 800 galvanic circle calculates subject by pre-set programs according to the electric current and voltage of 800 galvanic circle of tested device
The resistance value of 800 galvanic circle of equipment.
Power switch 1 is used to control the on-off of power supply of the whole machine；Switch switch 2 according to the test request of tested device, carries out
It is artificially pressed after wiring, liquid crystal display 5 circulation display internal wiring 10S, internal wiring 60s, external connection 10S, external connection 60s, generation
The different wiring of table flexibility Hall sensor 400 and constant-current source 300 it is different output electric current time；Start button 3 can be artificial
It presses, system is tested in the way of selection；Stop button 4 then when test is in an emergency, is artificially pressed, system
It stops working；Liquid crystal display 5 use 320X240 dot matrix LCD, be system human-computer dialogue window, show various test modes,
The contents such as test mode, result, prompt information；Printer 6 is stylus printer, for printing out test result；Ground connection
Terminal 12 is system working earthing；13 self carried fuse of power input socket is connected with the power supply line and power supply being equipped at random
Logical, power supply pattern is AC 220V, single-phase 50/60Hz；RS-232 interface 14 is for single-chip microcontroller 200 and computer (host computer)
On-line communication.
Below with reference to specific test process explanation working principle of the utility model is:
As shown in figure 3, for the utility model loop resistance test macro to GIS breaker carry out loop resistance test when
Wiring schematic diagram, wherein 15: disc insulator, 16:GIS metal shell, the metal of 17:GIS breaker and two sides grounding switch
Conductor, the grounding switch outlet of 18:GIS breaker two sides.
I+Terminal 7 and I- terminal 9 are grounded 18 phases with the grounding switch of GIS breaker two sides respectively through current output line 21
Even, the disc insulator 15 that flexible Hall sensor 400 is close to the grounding switch outlet of GIS breaker two sides is installed, V+Terminal 8
With V- terminal 10 through voltage tester line 22 respectively with the grounding switch of GIS breaker two sides ground line 18 be connected and positioned at electric current it is defeated
The inside that outlet 21 is connected a little with the grounding switch of GIS breaker two sides ground line 18.Turn on the power switch 1 connection complete machine electricity
Switching switch 2 is pressed in source, selects internal wiring 10S or internal wiring 60S, and single-chip microcontroller 200 controls constant-current source 300 according to preset mode
To GIS breaker Injection Current, after rising to constant DC current, current stabilization and start timing, system will be certainly after timing
Dynamic to terminate beam, single-chip microcontroller 200 is according to pre-set programs, by V+The potential difference of terminal 8 and V- terminal 10 is divided by flexible hall sensing
The electric current that device 400 samples is calculated, and the result obtained is the loop resistance value of GIS breaker, and passes through liquid crystal display 5
It pops up test record and saves dialog box, this time test terminates after carrying out the storage, inquiry, printing of test result.
As shown in figure 4, carrying out loop resistance survey to open type breaker 19 for the utility model loop resistance test macro
Wiring schematic diagram when examination.I+Terminal 7 and I- terminal 9 are through the earthing with open type breaker two sides respectively of current output line 21
Lock ground line 20 is connected, V+Terminal 8 and V- terminal 10 are through the earthing with open type breaker two sides respectively of voltage tester line 22
Lock ground line 20 is connected and is located at current output line 21 and is connected a little with the grounding switch of open type breaker two sides ground line 20
Inside, flexible Hall sensor 400 is connected with the grounding switch ground line 20 on the left of open type breaker is mounted to and in electric current
The outside that output line 21 is connected a little with the grounding switch ground line 20 on the left of open type breaker.It is whole to turn on the power switch 1 connection
Electromechanical source presses switching switch 2, selects external connection 10S or external connection 60S, and single-chip microcontroller 200 controls constant-current source according to preset mode
300 pairs of 19 Injection Currents of open type breaker, after rising to constant DC current, current stabilization simultaneously starts timing, is after timing
System will end automatically beam, and single-chip microcontroller 200 is according to pre-set programs, by V+The potential difference of terminal 8 and V- terminal 10 is divided by V+Terminal
The difference of 8 output electric currents and 400 sampling current of flexible Hall sensor is calculated, and the result obtained is open type breaker
19 loop resistance value, and test record is popped up by liquid crystal display 5 and saves dialog box, it carries out the storage of test result, look into
It askes, this time test terminates after printing.
For above-described embodiment simply to illustrate that the technical ideas and features of the present invention, its purpose is allows this field
Interior those of ordinary skill can understand the content of the utility model and implement accordingly, can not limit the utility model with this
Protection scope.The equivalent changes or modifications that all essence according to the content of the present invention is made, should all cover in this reality
With in novel protection scope.
Claims (5)
1. the loop resistance test macro under a kind of double ground states, it is characterised in that: including control cabinet, be arranged in control cabinet
The single-chip microcontroller and constant-current source in portion, setting are in the positive I of control cabinet+Terminal, I-Terminal, V+Terminal, V-Terminal and sensor input are inserted
Seat and the flexible Hall sensor being connected with sensor input socket；The connection of the control terminal of single-chip microcontroller and constant-current source, I+Terminal
And I-Terminal is connect with the output end of constant-current source respectively, I+Terminal and I-Terminal also passes through current output line and tested device respectively
The both ends of galvanic circle connect；V+Terminal, V-Terminal and sensor input socket are connect with single-chip microcontroller respectively, V+Terminal and V-End
Son is also connect by voltage tester line with the both ends of tested device galvanic circle respectively, and flexible Hall sensor is mounted on subject and sets
On standby galvanic circle or interference circuit, the front of the control cabinet is additionally provided with the switching switch connecting with single-chip microcontroller, which opens
Close the measurement pattern for switching single-chip microcontroller according to the installation site of flexible Hall sensor.
2. the loop resistance test macro under a kind of double ground states according to claim 1, it is characterised in that: described
The front of control cabinet is equipped with power switch, start button, stop button and the liquid crystal display connecting with single-chip microcontroller.
3. the loop resistance test macro under a kind of double ground states according to claim 2, it is characterised in that: described
The front of control cabinet is additionally provided with the printer connecting with single-chip microcontroller, ground terminal, power input socket and RS-232 interface.
4. the loop resistance test macro under a kind of double ground states according to claim 1 to 3, it is characterised in that:
It further include a sample circuit, which includes being connected to constant-current source and I+Sample resistance between terminal and it is connected to sampling
The amplifier and A/D converter one at resistance both ends, amplifier and A/D converter one are connect with single-chip microcontroller.
5. the loop resistance test macro under a kind of double ground states according to claim 4, it is characterised in that: further include
Amplifier and A/D converter two, V+Terminal, V-Terminal and sensor interface pass through amplifier and A/D converter two and single-chip microcontroller
Connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821533826.4U CN209070019U (en) | 2018-09-19 | 2018-09-19 | A kind of loop resistance test macro under double ground states |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821533826.4U CN209070019U (en) | 2018-09-19 | 2018-09-19 | A kind of loop resistance test macro under double ground states |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116119A (en) * | 2018-09-19 | 2019-01-01 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of loop resistance test macro under double ground states |
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2018
- 2018-09-19 CN CN201821533826.4U patent/CN209070019U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116119A (en) * | 2018-09-19 | 2019-01-01 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of loop resistance test macro under double ground states |
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