CN111190055A - Relay contact resistance testing arrangement - Google Patents
Relay contact resistance testing arrangement Download PDFInfo
- Publication number
- CN111190055A CN111190055A CN201811360753.8A CN201811360753A CN111190055A CN 111190055 A CN111190055 A CN 111190055A CN 201811360753 A CN201811360753 A CN 201811360753A CN 111190055 A CN111190055 A CN 111190055A
- Authority
- CN
- China
- Prior art keywords
- load
- relay
- power supply
- contact resistance
- interface
- 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
Images
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
- G01R27/20—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
-
- 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
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides a relay contact resistance testing device which comprises a power supply and a detection interface, wherein the detection interface comprises a positive detection interface and a negative detection interface which are respectively used for connecting two ends of a contact part of a relay to be tested; the device also comprises a control unit, a load box, a current sensor and a voltage sensor; a plurality of resistors are arranged in the load box and are respectively used for being connected with the power supply, the current sensor and the detection interface in series to form a test loop; the voltage sensor is used for detecting the voltage between the positive detection interface and the negative detection interface; and the control unit is connected with the signal output ends of the voltage sensor and the current sensor and used for calculating the contact resistance of the relay to be detected according to the data detected by the voltage sensor and the current sensor. According to the technical scheme provided by the invention, currents of different grades can be provided for the contact part of the relay to be tested, so that the contact resistance of the relay to be tested under different current grades can be tested, the workload in the testing process can be reduced, and the testing efficiency can be improved.
Description
Technical Field
The invention belongs to the technical field of relay contact resistance testing, and particularly relates to a relay contact resistance testing device.
Background
In an electricity utilization system, a relay is the most common and important device, and can realize on-off control of electricity utilization of a user; when relays of different models are used as on-off control devices in an electric power system, the quality of the relays directly affects the operation condition of the electric power system, if the contact resistance of a main circuit of the relay is large, phenomena such as meter burnout and the like can occur when a large load operates, even electrical operation safety accidents are caused, and when trouble is brought to a user, great burden is brought to an electric power maintenance department.
The main circuit of the relay has moving and static contacts made of special material, which directly affects the electric life and running safety of the relay, and the characteristic parameter reflecting the important physical characteristic is the contact resistance, which has different technical requirements for different types of relays.
In the traditional method for testing the contact resistance of the relay, a voltmeter and an ammeter are adopted to detect the voltage and the current of a contact part of the relay, and then the contact resistance of the relay is calculated according to ohm's law; the testing process of the testing method needs manual participation, and different power supplies need to be replaced when the contact resistance of the relay under different currents is tested, so that the testing workload is increased, and the testing efficiency is reduced.
Disclosure of Invention
The invention aims to provide a relay contact resistance testing device, which is used for solving the problems of large workload and low testing efficiency when testing the contact resistance of a relay in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a relay contact resistance testing device comprises a power supply and a detection interface, wherein the detection interface comprises a positive detection interface and a negative detection interface which are respectively used for connecting two ends of a contact part of a relay to be tested; the device also comprises a control unit, a load box, a current sensor and a voltage sensor;
a plurality of load resistors are arranged in the load box and are respectively used for being connected with the power supply, the current sensor and the detection interface in series to form a test loop; the voltage sensor is used for detecting the voltage between the positive detection interface and the negative detection interface; and the control unit is connected with the signal output ends of the voltage sensor and the current sensor and is used for calculating the contact resistance of the relay to be detected according to the data detected by the voltage sensor and the current sensor.
According to the technical scheme provided by the invention, a plurality of resistors are arranged in the load box, and when different resistors are connected with the power supply, the current sensor and the detection interface to form a test loop, currents of different grades can be provided for the contact part of the relay to be tested, so that the contact resistance of the relay to be tested under different current grades can be tested, the workload in the test process can be reduced, and the test efficiency can be improved.
Furthermore, the power supply is a program-controlled power supply, and the control unit is connected with the control end of the program-controlled power supply.
By adopting the program-controlled power supply, the control unit can control the working state of the control unit according to the requirement.
Furthermore, the load box is provided with an input end and an output end, and controllable switches corresponding to the number of the resistors are also arranged in the load box; each load resistor in the load box is respectively connected with the corresponding controllable switch in series to form a resistor branch, and each resistor branch is arranged between the input end and the output end of the load box in parallel; the control unit is connected with the control part of each controllable switch.
And a controllable switch is arranged, and the resistor connected with the detection interface in series can be controlled by the control unit.
Furthermore, load resistors in part or all of the resistor branches are respectively provided with corresponding inductors in parallel.
After the resistor in the resistor branch is connected with the inductor in parallel, an inductive load can be provided when the contact resistance of the relay to be tested is tested.
Furthermore, the power supply is a three-phase alternating-current power supply, the detection interfaces comprise three positive detection interfaces and three negative detection interfaces, the input end of the load box is provided with an A-phase input interface, a B-phase input interface and a C-phase input interface, and the output end of the load box is provided with an N-phase output interface; the load resistors in the load box are divided into set groups, each group comprises three load resistors, the resistance values of the three load resistors in the same group are the same, one end of each load resistor is connected with the A-phase input interface, the B-phase input interface and the C-phase input interface respectively, and the other end of each load resistor is connected with the N-phase output interface.
The three-phase alternating current power supply and the three-phase four-wire load box are adopted, so that three-phase alternating current and three-phase load can be provided when the contact resistance of the relay to be tested is tested.
Further, the intelligent control system also comprises a display screen, and the control unit is connected with the display screen.
And a display screen is arranged, and the control unit can display the detection result through the display screen.
Furthermore, an indicator light is arranged on the display screen, and the control unit is connected with the indicator light and used for controlling the working state of the indicator light according to the state of the test circuit.
The status of the test loop can be displayed by arranging an indicator lamp.
Drawings
FIG. 1 is a schematic structural diagram of a relay contact resistance testing device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a test loop in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit configuration of a load box when the power supply is a single-phase AC power supply or a DC power supply according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit configuration of a load box when a power source is a single-phase AC power source or a DC power source and an inductive load is disposed in the load box according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a circuit structure employing a single-pole multi-throw switch in a load box when the power supply is a single-phase AC power supply or a DC power supply according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a circuit structure of a load box when the power supply is a three-phase power supply according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a circuit structure of a load box when a power supply is a three-phase power supply and an inductive load is disposed in the load box according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a circuit structure of the control unit for controlling the indicator light according to the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the specific embodiments.
The embodiment provides a relay contact resistance testing device, which supplies power to a contact part of a relay through a power supply, and calculates the contact resistance of the relay through the current of the contact part of the relay and the voltage at two ends of the contact part of the relay.
The structure principle of the relay contact resistance testing device provided by the embodiment is shown in fig. 1, and the relay contact resistance testing device comprises a main control unit, a detection interface, a power supply and a load box.
In order to facilitate control over the power supply, the power supply in this embodiment is a program-controlled power supply, and the main control unit is connected to a control end of the program-controlled power supply and is configured to control a working state of the program-controlled power supply.
The detection interface comprises a positive detection interface and a negative detection interface which are respectively used for connecting two ends of a contact part of the relay to be detected; the control unit is connected with a current sensor and a voltage sensor, and a plurality of load resistors are arranged in the load box; when testing the contact resistance of the relay to be tested, one of the load resistors in the power supply, the current sensor, the detection interface and the load box is connected in series to form a test loop, as shown in fig. 2, the voltage sensors are arranged at two ends of the contact part of the relay to be tested and are used for detecting the voltage at two ends of the contact part of the relay to be tested; when the contact part of the relay to be tested is closed, the control unit detects the current in the test loop through the current sensor, and the current is the current I of the contact part of the relay to be tested; the control unit detects the voltage U across the relay contact portion through the voltage sensor.
After the control unit measures the current I of the relay contact part to be measured and the voltage U at the two ends of the current I, the resistance R of the relay contact part to be measured is calculated according to the ohm law:
R＝U/I
and the resistance R of the contact part of the relay to be tested is the contact resistance of the relay to be tested.
According to the test requirements, the circuit structures adopted in the load box are different.
When the power supply is a single-phase alternating-current power supply or a direct-current power supply, the circuit structure in the load box is as shown in fig. 3, the load box comprises an input interface and an output interface, and is provided with load resistors R1 to Rn and controllable switches K1 to Kn, the number of which corresponds to that of the load resistors; each load resistor is respectively connected with the corresponding controllable switch in series to form a resistor branch circuit, and then each resistor branch circuit is arranged between the input interface and the output interface of the load box in parallel. The control unit is connected with the control parts of the control switches, and the current of the relay contact part to be tested is adjusted by controlling the state of each control switch to select the load resistor connected to the test loop.
In order to meet the requirement of the inductive load during the test, the resistors in the branch circuit of the partial resistor inside the load box of the present embodiment are provided with inductors in parallel, as shown in fig. 4, wherein the load resistors R1 to Rm are respectively provided in parallel with the inductors L1 to Lm, where m is greater than 1 and less than n. In other embodiments, an inductor may also be connected in parallel to each load resistor.
As another embodiment, when the power supply is a single-phase ac power supply or a dc power supply, the current interface in the load box is as shown in fig. 5, a single-pole multi-throw switch K is disposed in the load box, one end of each load resistor is connected to the output interface of the load box, and the other end is connected to each interface of the stationary end in the single-pole multi-throw switch K; the moving end of the single-pole multi-throw switch K is connected with an input interface of the load box.
The control unit is connected with the control part of the single-pole multi-throw switch K, and the current of the relay contact part to be tested is adjusted by controlling the state of the single-pole multi-throw switch K to select the load resistance connected to the test loop.
When the power supply is a three-phase power supply, the circuit structure in the load box is as shown in fig. 6, the load box comprises an input interface and an output interface, and is provided with controllable switches corresponding to the number of load resistors; the input interface of the load box comprises an A-phase input interface, a B-phase input interface and a C-phase input interface, and the output interface comprises an N-phase output interface. The load resistors are divided into a plurality of groups, and each group comprises three load resistors with the same resistance value; and after the load resistors in the same group are respectively connected with the corresponding controllable switches in series to form resistor branches, one end of each resistor branch is connected with the N-phase output interface, and the other end of each resistor branch is respectively connected with the A-phase input interface, the B-phase input interface and the C-phase input interface. The control unit is connected with the control parts of the control switches, and the current of the relay contact part to be tested is adjusted by controlling the state of each control switch to select the load resistor connected to the test loop.
In order to meet the requirement of the inductive load during the test, the resistors in all or part of the resistor branches in the load box of the embodiment are provided with inductors in parallel, as shown in fig. 7.
The control unit is also connected with a display screen, and when the control unit acquires the current of the contact part of the relay to be tested and the voltage at two ends of the contact part of the relay to be tested through the current sensor, the current and the voltage are displayed on the display screen, and the calculated contact resistance of the relay to be tested is displayed on the display screen.
The display screen is also provided with an indicator light, the circuit structure of the indicator light is shown in fig. 8, the indicator light comprises a triode Q, a collector of the triode Q is connected with a 5V power supply, an emitter of the triode Q is grounded through a pull-down resistor Rp, and a base of the triode Q is connected with the control unit; the indicator light is a light emitting diode D, the anode of the indicator light is connected with the emitting stage of the triode Q, and the cathode of the indicator light is grounded.
When the power supply is a single-phase alternating current power supply or a direct current power supply, an indicator lamp is arranged on the display screen, when the control unit detects that the contact part of the relay to be tested has current through the current sensor, a control signal is sent to the triode Q to control the conduction of the triode Q, and the light-emitting diode D is electrified after the triode is conducted to start to emit light; whether the contact part of the relay to be tested has current can be judged by observing the indicator light.
When the power supply is a three-phase alternating current power supply, three indicator lights are arranged on the display screen, and the sub-parts correspond to the three-phase circuit direction; when the control unit detects that the contact part of the relay to be tested in a certain phase circuit has current through the current sensor, a control signal is sent to the triode Q of the corresponding indicator lamp to control the conduction of the triode Q, and the triode Q is electrified D corresponding to the light-emitting diode after being conducted to start to emit light; whether the relay contact part to be tested of each phase circuit has current can be judged by observing the indicator lamp.
In the load box of the embodiment, all controllable switches are relay switches, coil parts of the relay switches are control parts of the relay switches, the main control unit is connected with the coil parts of the relay switches, and the coil parts of the relay switches control the contact parts of the relay switches to act, so that the controllable switches are controlled; as other embodiments, the controllable switch may adopt devices such as a thyristor and a switching tube, and when the controllable switch adopts these devices, the control electrode of these devices is the control part thereof.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (7)
1. A relay contact resistance testing device comprises a power supply and a detection interface, wherein the detection interface comprises a positive detection interface and a negative detection interface which are respectively used for connecting two ends of a contact part of a relay to be tested; the device is characterized by also comprising a control unit, a load box, a current sensor and a voltage sensor;
a plurality of load resistors are arranged in the load box and are respectively used for being connected with the power supply, the current sensor and the detection interface in series to form a test loop; the voltage sensor is used for detecting the voltage between the positive detection interface and the negative detection interface; and the control unit is connected with the signal output ends of the voltage sensor and the current sensor and is used for calculating the contact resistance of the relay to be detected according to the data detected by the voltage sensor and the current sensor.
2. The relay contact resistance testing device according to claim 1, wherein the power supply is a programmable power supply, and the control unit is connected to a control terminal of the programmable power supply.
3. The relay contact resistance testing device according to claim 1, wherein the load box is provided with an input end and an output end, and controllable switches corresponding to the number of load resistors are further arranged in the load box; each load resistor in the load box is respectively connected with the corresponding controllable switch in series to form a resistor branch, and each resistor branch is arranged between the input end and the output end of the load box in parallel; the control unit is connected with the control part of each controllable switch.
4. The relay contact resistance testing device according to claim 3, wherein the load resistors in some or all of the resistor branches are respectively provided with corresponding inductors in parallel.
5. The relay contact resistance testing device according to claim 3 or 4, wherein the power supply is a three-phase alternating current power supply, the detection interfaces comprise three positive detection interfaces and three negative detection interfaces, the input end of the load box is provided with an A-phase input interface, a B-phase input interface and a C-phase input interface, and the output end of the load box is provided with an N-phase output interface; the load resistors in the load box are divided into set groups, each group comprises three load resistors, the resistance values of the three load resistors in the same group are the same, one end of each load resistor is connected with the A-phase input interface, the B-phase input interface and the C-phase input interface respectively, and the other end of each load resistor is connected with the N-phase output interface.
6. The relay contact resistance testing device according to claim 1, further comprising a display screen, wherein the control unit is connected to the display screen.
7. The relay contact resistance testing device according to claim 6, wherein an indicator light is arranged on the display screen, and the control unit is connected with the indicator light and used for controlling the working state of the indicator light according to the state of the testing loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360753.8A CN111190055A (en) | 2018-11-15 | 2018-11-15 | Relay contact resistance testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360753.8A CN111190055A (en) | 2018-11-15 | 2018-11-15 | Relay contact resistance testing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111190055A true CN111190055A (en) | 2020-05-22 |
Family
ID=70707123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811360753.8A Pending CN111190055A (en) | 2018-11-15 | 2018-11-15 | Relay contact resistance testing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111190055A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2151468Y (en) * | 1993-03-02 | 1993-12-29 | 杭州桥兴电讯设备厂 | AC/DC Loader |
| CN201982283U (en) * | 2011-03-11 | 2011-09-21 | 中国农业科学院农田灌溉研究所 | Automatic water pumping device for water collection pits |
| CN201993444U (en) * | 2010-12-09 | 2011-09-28 | 华北电网有限公司计量中心 | Relay testing device and system |
| CN103033744A (en) * | 2012-12-25 | 2013-04-10 | 山东泰山抽水蓄能电站有限责任公司 | Relay automatic verifying platform |
| CN104898049A (en) * | 2015-05-22 | 2015-09-09 | 湖南华峰新宇电子有限公司 | Electromagnetic circuit breaker debugging and detection equipment system |
| CN204719206U (en) * | 2015-06-30 | 2015-10-21 | 深圳市赛格导航科技股份有限公司 | Electromagnetic relay proving installation |
| CN106154156A (en) * | 2016-09-23 | 2016-11-23 | 上海地铁维护保障有限公司 | Relay contact analog control system table apparatus |
| CN205958678U (en) * | 2016-08-30 | 2017-02-15 | 凌云科技集团有限责任公司 | Contactor test equipment |
| CN206960614U (en) * | 2017-06-23 | 2018-02-02 | 西安中车永电捷通电气有限公司 | Contactor test device |
-
2018
- 2018-11-15 CN CN201811360753.8A patent/CN111190055A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2151468Y (en) * | 1993-03-02 | 1993-12-29 | 杭州桥兴电讯设备厂 | AC/DC Loader |
| CN201993444U (en) * | 2010-12-09 | 2011-09-28 | 华北电网有限公司计量中心 | Relay testing device and system |
| CN201982283U (en) * | 2011-03-11 | 2011-09-21 | 中国农业科学院农田灌溉研究所 | Automatic water pumping device for water collection pits |
| CN103033744A (en) * | 2012-12-25 | 2013-04-10 | 山东泰山抽水蓄能电站有限责任公司 | Relay automatic verifying platform |
| CN104898049A (en) * | 2015-05-22 | 2015-09-09 | 湖南华峰新宇电子有限公司 | Electromagnetic circuit breaker debugging and detection equipment system |
| CN204719206U (en) * | 2015-06-30 | 2015-10-21 | 深圳市赛格导航科技股份有限公司 | Electromagnetic relay proving installation |
| CN205958678U (en) * | 2016-08-30 | 2017-02-15 | 凌云科技集团有限责任公司 | Contactor test equipment |
| CN106154156A (en) * | 2016-09-23 | 2016-11-23 | 上海地铁维护保障有限公司 | Relay contact analog control system table apparatus |
| CN206960614U (en) * | 2017-06-23 | 2018-02-02 | 西安中车永电捷通电气有限公司 | Contactor test device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102435886B (en) | Test bed and test system for inverter of rail transit vehicle | |
| CN207557429U (en) | The test device of Morse Shi Mite relays | |
| CN204347214U (en) | A kind of injection type power generator carbon brush contact detecting apparatus | |
| CN204575726U (en) | A kind of LED drive power detection system and equipment | |
| CN110673054B (en) | DC/DC power supply test system and aging test method of DC/DC power supply | |
| CN206960614U (en) | Contactor test device | |
| CN108594107B (en) | Comprehensive tester for circuit breaker loop resistance test and mechanical characteristic test | |
| CN113447856A (en) | Automatic quality inspection testing device and method for transformer | |
| CN106569125A (en) | Automatic test apparatus for airplane DC switch controller | |
| CN204649867U (en) | Switch cart detects commissioning device | |
| CN111190055A (en) | Relay contact resistance testing arrangement | |
| CN106124946A (en) | The control coil turn-to-turn insulation failure detector of primary cut-out and detection method | |
| CN209979826U (en) | Testing device of distribution transformer | |
| CN115453141A (en) | Three-phase transfer speed measuring device of circuit breaker | |
| CN109270424A (en) | Automobile air conditioner electromagnetic clutch coil freewheeling diode detection device and detection method | |
| CN209086383U (en) | Automobile air conditioner electromagnetic clutch coil freewheeling diode detection device | |
| CN212207607U (en) | Quick wiring control device for temperature rise test of motor winding | |
| CN211603357U (en) | Three-phase test load | |
| CN210803672U (en) | Motor detection device and motor detection system | |
| CN208156155U (en) | A kind of air switch pneumatic type test fixture | |
| CN207457430U (en) | A kind of relay protection circuit integrity tester | |
| CN220584322U (en) | Low-voltage contactor testing device | |
| CN110726956A (en) | Electric leakage detection circuit and device | |
| CN218647107U (en) | Direct current switch test platform | |
| CN205280842U (en) | Low voltage apparatus electricity life test examination article switch closes branch state detection device |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200522 |