CN212111597U - System of direct current system feeder ground resistance calibrator - Google Patents
System of direct current system feeder ground resistance calibrator Download PDFInfo
- Publication number
- CN212111597U CN212111597U CN201922151360.2U CN201922151360U CN212111597U CN 212111597 U CN212111597 U CN 212111597U CN 201922151360 U CN201922151360 U CN 201922151360U CN 212111597 U CN212111597 U CN 212111597U
- Authority
- CN
- China
- Prior art keywords
- switch
- direct current
- power supply
- feeder
- terminal
- 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
- 238000009413 insulation Methods 0.000 claims description 17
- 238000012806 monitoring device Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 10
- 230000005669 field effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a system of direct current system feeder ground resistance check gauge, direct current system feeder ground resistance check gauge's system includes: variable resistance, switch and binding post, wherein: the input end of the switch is externally connected with a direct current feeder power supply through the wiring terminal, the output end of the switch is connected with the input end of the variable resistor in series, and the output end of the variable resistor is grounded through the wiring terminal. The utility model discloses in the implementation, the system of direct current system feeder ground resistance check gauge has connect the test wire after the manual work, can be through automatic change resistance value and switching feeder to the record ground connection reports an emergency and asks for help or increased vigilance the resistance, has improved the efficiency of work effectively.
Description
Technical Field
The utility model relates to a 220V DC power supply system's technical field especially relates to a system of DC system feeder ground resistance check gauge.
Background
The direct current system of the transformer substation has certain requirements on ground insulation, if the direct current system and the load equipment connected with the direct current system are influenced to normally operate by a certain insulation resistance value, the insulation resistance value needs to be checked, at present, for the checking of the grounding alarm resistance value of a feeder line of the direct current system, a commonly used method is that one person or two persons use a plurality of resistors or slide rheostats with different resistance values for manual operation and recording, the switching of the resistance value is a large amount of simple repeated operation work, and each direct current system of the transformer substation is provided with dozens or even hundreds of feeder line branches along with the increase of equipment in the transformer substation, so that the checking work time is long, and the work efficiency is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, the utility model provides a system of direct current system feeder ground resistance check gauge can change the resistance value automatically and switch the feeder to the resistance is reported an emergency and asked for help or increased vigilance to the record ground connection.
In order to solve the above problem, the utility model provides a system of direct current system feeder ground resistance check gauge, direct current system feeder ground resistance check gauge's system includes: variable resistance, switch and binding post, wherein: the input end of the switch is externally connected with a direct current feeder power supply through the wiring terminal, the output end of the switch is connected with the input end of the variable resistor in series, and the output end of the variable resistor is grounded through the wiring terminal.
Optionally, the number of the switches is five, and the switches are respectively a first switch K1, a second switch K2, a third switch K3, a fourth switch K4 and a fifth switch K5; correspondingly, the number of the connecting terminals is five, and the connecting terminals are respectively a first connecting terminal, a second connecting terminal, a third connecting terminal, a fourth connecting terminal and a fifth connecting terminal; correspondingly, the number of the external direct current feeder power supplies is also five, and the external direct current feeder power supplies are respectively a first direct current feeder power supply, a second direct current feeder power supply, a third direct current feeder power supply, a fourth direct current feeder power supply and a fifth direct current feeder power supply.
Optionally, an input end of the first switch K1 is externally connected to a first dc feeder power supply through the first connection terminal to form a first branch; the input end of the second switch K2 is externally connected with a second direct-current feeder power supply through the second wiring terminal to form a second branch circuit; the input end of the third switch K3 is externally connected with a third direct-current feeder power supply through the third wiring terminal to form a third branch circuit; the input end of the fourth switch K4 is externally connected with a fourth direct-current feeder power supply through the fourth wiring terminal to form a fourth branch; the input end of the fifth switch K5 is externally connected with a fifth direct-current feeder power supply through the fifth wiring terminal to form a fifth branch.
Optionally, the first branch, the second branch, the third branch, the fourth branch and the fifth branch are respectively connected in parallel, and are converged into a branch to be connected in series with the input end of the variable resistor.
Optionally, the connection terminal further includes a sixth connection terminal; and the input end of the variable resistor is grounded through the sixth wiring terminal.
Optionally, the system of the dc system feeder ground resistance calibrator further includes an interface opened from the outside; and the interface opened from the outside is connected with a grounding alarm signal contact of the insulation monitoring device of the direct current system.
In the implementation of the utility model, after the test line is manually connected, the resistance value of the resistor and the feeder line can be automatically changed and switched, and the grounding alarm resistance value is recorded, so that twenty feeder lines can be continuously tested in five minutes; manual operation is not needed in the testing process, repeated operation and working time are reduced, and working efficiency is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a system structure of a dc system feeder ground resistance calibrator.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram of a system structure of a dc system feeder ground resistance calibrator.
Referring to fig. 1, a system of a dc system feeder ground resistance calibrator includes: variable resistance, switch and binding post, wherein: the input end of the switch is externally connected with a direct current feeder power supply through the wiring terminal, the output end of the switch is connected with the input end of the variable resistor in series, and the output end of the variable resistor is grounded through the wiring terminal.
Optionally, the number of the switches is five, and the switches are respectively a first switch K1, a second switch K2, a third switch K3, a fourth switch K4 and a fifth switch K5; correspondingly, the number of the connecting terminals is five, and the connecting terminals are respectively a first connecting terminal, a second connecting terminal, a third connecting terminal, a fourth connecting terminal and a fifth connecting terminal; correspondingly, the number of the external direct current feeder power supplies is also five, and the external direct current feeder power supplies are respectively a first direct current feeder power supply, a second direct current feeder power supply, a third direct current feeder power supply, a fourth direct current feeder power supply and a fifth direct current feeder power supply.
It should be noted that, in the specific implementation of the present invention, the number of the switches is twenty; correspondingly, the number of the wiring terminals is twenty; correspondingly, the number of the external direct current feeder power supplies is twenty.
Optionally, an input end of the first switch K1 is externally connected to a first dc feeder power supply through the first connection terminal to form a first branch; the input end of the second switch K2 is externally connected with a second direct-current feeder power supply through the second wiring terminal to form a second branch circuit; the input end of the third switch K3 is externally connected with a third direct-current feeder power supply through the third wiring terminal to form a third branch circuit; the input end of the fourth switch K4 is externally connected with a fourth direct-current feeder power supply through the fourth wiring terminal to form a fourth branch; the input end of the fifth switch K5 is externally connected with a fifth direct-current feeder power supply through the fifth wiring terminal to form a fifth branch.
It should be noted that in the specific implementation of the present invention, the input terminals of the twenty switches respectively pass through the twenty connecting terminals are externally connected to the twenty direct current feeder power supplies, which respectively form twenty branches.
Optionally, the first branch, the second branch, the third branch, the fourth branch and the fifth branch are respectively connected in parallel, and are converged into a branch to be connected in series with the input end of the variable resistor.
It should be noted that, in the specific implementation of the present invention, the twenty branches are respectively connected in parallel and converged into one branch to be connected in series with the input end of the variable resistor.
Specifically, the variable resistor is connected in two ways:
the first method is as follows: a resistance direct connection method: the variable resistor is connected in series to a value required by a gear, and then controlled by a field effect transistor, one end of the variable resistor is connected to 220V, the other end of the variable resistor is connected to the anode of a field effect transistor 2N60, a singlechip gives a high level signal to a control electrode of the field effect transistor, the field effect transistor works in the same state as a switch state, namely the action of manually switching in the variable resistor is the same;
the second method comprises the following steps: 8421 the method of encoding: the resistance value range of 20K-10K is practical, and the current flowing through the circuit is very large when the circuit works at 10K, so that a high-power load resistor is required to be used; the coding mode is formed by combining four resistors, the resistance value switching can be carried out by controlling a relay and a field effect transistor, the relay does not act when 10K is used, the 220V direct current is connected to a normally closed pin of the relay, the single chip microcomputer transmits a high level signal to the field effect transistor connected with the 10K resistors in series to conduct the field effect transistor, when the measured value is 11K, the switching is carried out by the conducting combination of the relay and the field effect transistor, the 10K resistors and the 1K resistors are connected in series to an instrument, and the switching from 10K to 20K is also carried out by using the mode; the method comprises the steps that a total of 20 feeders are simultaneously connected in, the 20 feeders are firstly input and selected through 20 relays, only one feeder can be tested each time, two decimal calculators are used for driving the 20 relays, therefore, a single chip microcomputer can control the 20 relays only by means of four wires, when the single chip microcomputer sends a pulse signal out of the calculators, the corresponding relays are switched from the first relays, resistance measurement is started after the relays are switched, and when a pin of the single chip microcomputer receives an externally connected alarm signal, the resistance value of the current test resistor is recorded and displayed through a serial port display screen.
In the specific implementation of the present invention, the connection terminal further includes a sixth connection terminal; and the input end of the variable resistor is grounded through the sixth wiring terminal.
In the specific implementation of the present invention, the system of the dc system feeder ground resistance calibrator further includes an interface opened from the outside; and the interface opened from the outside is connected with a grounding alarm signal contact of the insulation monitoring device of the direct current system.
In specific implementation, 20 wiring terminals are arranged at the back of the instrument, the wiring terminals are connected to a feeder terminal on a feeder screen of a direct current system by using test wires, a common terminal is grounded, a ground fault signal contact of a direct current insulation monitoring device is connected to a signal input terminal of the instrument, and then the instrument touch screen is clicked to start testing; when the calibration is started, the first switch K1 is switched on, the variable resistor automatically reduces from 1M omega, when the resistance value of the variable resistor reduces to the grounding alarm fixed value of the insulation monitoring device, the grounding alarm signal contact of the insulation monitoring device is switched on, the instrument receives a signal and records the resistance value at the moment, and meanwhile, the resistance value of the variable resistor restores to 1M omega; then the first switch K1 is switched off, the second switch K2 is switched on, the variable resistor automatically starts to reduce from 1M omega, when the resistance value of the variable resistor is reduced to the grounding alarm fixed value of the insulation monitoring device, the grounding alarm signal contact of the insulation monitoring device is switched on, the instrument receives a signal, the resistance value at the moment is recorded, and meanwhile, the resistance value of the variable resistor is restored to 1M omega; then the second switch K2 is switched off, the third switch K3 is switched on, the variable resistor automatically starts to reduce from 1M omega, when the resistance value of the variable resistor is reduced to the grounding alarm fixed value of the insulation monitoring device, the grounding alarm signal contact of the insulation monitoring device is switched on, the instrument receives a signal and records the resistance value at the moment, and meanwhile, the resistance value of the variable resistor is restored to 1M omega; then the third switch K3 is switched off, the fourth switch K4 is switched on, the variable resistor automatically starts to reduce from 1M omega, when the resistance value of the variable resistor is reduced to the grounding alarm fixed value of the insulation monitoring device, the grounding alarm signal contact of the insulation monitoring device is switched on, the instrument receives a signal, the resistance value at the moment is recorded, and meanwhile, the resistance value of the variable resistor is recovered to 1M omega; then the fourth switch K4 is switched off, the fifth switch K5 is switched on, the variable resistor automatically starts to reduce from 1M omega, when the resistance value of the variable resistor is reduced to the grounding alarm fixed value of the insulation monitoring device, the grounding alarm signal contact of the insulation monitoring device is switched on, the instrument receives a signal and records the resistance value at the moment, and meanwhile, the resistance value of the variable resistor is restored to 1M omega; and after the fifth switch K5 is disconnected, repeating the steps until the twentieth switch is switched on and off, namely completing the grounding resistance verification of the feeder line of the direct current system.
In the implementation of the utility model, after the test line is manually connected, the resistance value of the resistor and the feeder line can be automatically changed and switched, and the grounding alarm resistance value is recorded, so that twenty feeder lines can be continuously tested in five minutes; manual operation is not needed in the testing process, repeated operation and working time are reduced, and working efficiency is effectively improved.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The system of the dc system feeder ground resistance calibrator provided by the embodiment of the present invention is introduced in detail, and the principle and the implementation of the present invention are explained by using specific embodiments, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (6)
1. A system of a direct current system feeder ground resistance calibrator, characterized in that the system of the direct current system feeder ground resistance calibrator comprises: variable resistance, switch and binding post, wherein: the input end of the switch is externally connected with a direct current feeder power supply through the wiring terminal, the output end of the switch is connected with the input end of the variable resistor in series, and the output end of the variable resistor is grounded through the wiring terminal.
2. A system of a dc system feeder ground resistance calibrator as claimed in claim 1, wherein the number of said switches is five, respectively, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4 and a fifth switch K5; correspondingly, the number of the connecting terminals is five, and the connecting terminals are respectively a first connecting terminal, a second connecting terminal, a third connecting terminal, a fourth connecting terminal and a fifth connecting terminal; correspondingly, the number of the external direct current feeder power supplies is also five, and the external direct current feeder power supplies are respectively a first direct current feeder power supply, a second direct current feeder power supply, a third direct current feeder power supply, a fourth direct current feeder power supply and a fifth direct current feeder power supply.
3. A system of a dc system feeder ground resistance calibrator as claimed in claim 2, wherein an input terminal of said first switch K1 is externally connected to a first dc feeder power supply via said first connection terminal to form a first branch; the input end of the second switch K2 is externally connected with a second direct-current feeder power supply through the second wiring terminal to form a second branch circuit; the input end of the third switch K3 is externally connected with a third direct-current feeder power supply through the third wiring terminal to form a third branch circuit; the input end of the fourth switch K4 is externally connected with a fourth direct-current feeder power supply through the fourth wiring terminal to form a fourth branch; the input end of the fifth switch K5 is externally connected with a fifth direct-current feeder power supply through the fifth wiring terminal to form a fifth branch.
4. A system as claimed in claim 3, wherein said first, second, third, fourth and fifth branches are connected in parallel and converged into a single branch to be connected in series with said input terminal of said variable resistor.
5. A system as claimed in claim 1, wherein said terminals further comprise a sixth terminal; and the input end of the variable resistor is grounded through the sixth wiring terminal.
6. The system of a dc system feeder ground resistance verifier according to claim 1, wherein the system of dc system feeder ground resistance verifier further comprises an externally open interface; and the interface opened from the outside is connected with a grounding alarm signal contact of the insulation monitoring device of the direct current system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922151360.2U CN212111597U (en) | 2019-12-04 | 2019-12-04 | System of direct current system feeder ground resistance calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922151360.2U CN212111597U (en) | 2019-12-04 | 2019-12-04 | System of direct current system feeder ground resistance calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212111597U true CN212111597U (en) | 2020-12-08 |
Family
ID=73620012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922151360.2U Expired - Fee Related CN212111597U (en) | 2019-12-04 | 2019-12-04 | System of direct current system feeder ground resistance calibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212111597U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589210A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Portable grounding test device and method for DC power supply system for plant station |
-
2019
- 2019-12-04 CN CN201922151360.2U patent/CN212111597U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589210A (en) * | 2021-08-27 | 2021-11-02 | 广东电网有限责任公司 | Portable grounding test device and method for DC power supply system for plant station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104793058A (en) | High-voltage insulating resistance monitoring alarm device and working method thereof | |
| CN110940898A (en) | Insulation and voltage resistance testing device for electric connector | |
| CN212111597U (en) | System of direct current system feeder ground resistance calibrator | |
| CN106405375A (en) | Multipath resistance and voltage testing method, device and system | |
| CN108427053A (en) | A kind of electrical safety auto Testing System and test method | |
| CN111505562A (en) | Test system for metering performance self-monitoring capability of electric energy meter | |
| CN209707671U (en) | Transformer station direct current system resistance test device over the ground | |
| CN212229042U (en) | Multichannel automatic switching device of grounding on-resistance tester | |
| CN205404719U (en) | Mutual -inductor common return multipoint earthing detector | |
| CN112230166A (en) | Module harness on-off test device and method and module offline test system | |
| CN111505456A (en) | Electric component testing and monitoring device | |
| CN111880007A (en) | Method and system for judging circuit breaker loop resistance qualification | |
| CN116047286A (en) | Mechanical life test system and method for high-voltage switch equipment | |
| CN217034170U (en) | Portable relay automatic check platform | |
| CN211123208U (en) | Direct-current ground fault finding experimental platform for DCS (distributed control system) of nuclear power plant | |
| CN110857953A (en) | Tester and method for measuring resistance of conductor connection point in power-on circuit | |
| CN108931699A (en) | DC break down voltage test device | |
| CN210166483U (en) | Portable device for ground resistance alarm value verification and line selection verification | |
| CN114113923A (en) | Long-time direct-current insulation impedance testing method and device for flexible wire for decorative lighting loop | |
| CN220730400U (en) | Early monitoring device for program control cabinet ground fault | |
| KR100961170B1 (en) | Automatic diagnostic system for power electronics device | |
| CN220625608U (en) | Acquisition device and containment overall tightness test system | |
| CN110531232A (en) | A kind of a variety of insulation defect Characteristics of Partial Discharge measuring systems of XLPE cable | |
| CN110579691A (en) | Storage battery pack insulation descending positioning monitoring device and method | |
| CN213210208U (en) | A wiring conversion equipment for circuit breaker characteristic test |
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: 20201208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |