CN110187258B - Remote control loop tester of measurement and control device - Google Patents
Remote control loop tester of measurement and control device Download PDFInfo
- Publication number
- CN110187258B CN110187258B CN201910392778.4A CN201910392778A CN110187258B CN 110187258 B CN110187258 B CN 110187258B CN 201910392778 A CN201910392778 A CN 201910392778A CN 110187258 B CN110187258 B CN 110187258B
- Authority
- CN
- China
- Prior art keywords
- unit
- remote control
- measurement
- control device
- delay
- 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.)
- Active
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 50
- 230000009471 action Effects 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000011664 signaling Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 abstract description 15
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a remote control loop tester of a measurement and control device, which is used for solving the problems that in the prior art, power failure test is needed, the remote control signal outlet time is short, and a multimeter is adopted to test staff to observe results. Comprising the following steps: the device comprises a power supply unit, a time delay unit, an alarm unit, an action unit and a feedback unit; the power supply unit supplies power for the action unit and the delay unit, the measurement and control device sends a remote control signal to the action unit, the delay unit works after the action unit acts, the delay unit controls the alarm unit to perform action alarm, and meanwhile, the action unit feeds back an action result to the measurement and control device. The beneficial effects include: the remote control outlet time of the measurement and control device can be prolonged, the remote control outlet time testing range is adjustable, and convenience is provided for the work of overhaulers. Meanwhile, the dispatching automation monitoring system can display the change condition of the remote control object in real time. The test working efficiency is improved by 30%, the power grid overhaul efficiency is improved, and the power supply reliability is ensured.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a remote control loop tester of a measurement and control device.
Background
The current 'regulation and control integrated' mode of the regional power grid is greatly carried out, and a regional master station data acquisition and monitoring control system (Supervisory Control And Data Acquisition, SCADA) is required, namely, more and more of dispatching system upgrading and transformer substation comprehensive automatic transformation are required. Along with the upgrade of a dispatching automation master station system and the comprehensive self-transformation of a transformer substation, a plurality of remote control and remote signaling experiments are required to be completed under the condition of no power failure. The time and accuracy of remote control loop test directly affect the overhaul time of team work and regional power grid safety. Therefore, accurate remote control loop test of the measurement and control device is a non-negligible important link in the work.
The current remote control loop test method is to use a universal meter to measure the on-off of a loop on site, and the method has the adverse phenomena of loud noise in the site environment and unclear indication of the universal meter. In the process of system upgrading or comprehensive self-improvement, if a test method is incorrect or operation is not standard, the situation of remote control misoperation is easily caused. Meanwhile, the remote control signal outlet time is too short, so that the phenomenon is not observed by conventional instruments and workers. In operation, a fast and accurate instrument is needed to perform the testing of the remote control loop.
Disclosure of Invention
The embodiment of the invention provides a remote control loop tester of a measurement and control device, which is used for solving the problems that in the prior art, power failure test is needed, the remote control signal outlet time is short, and a multimeter is adopted to test staff to observe results.
The embodiment of the invention provides a remote control loop tester of a measurement and control device, which comprises the following components: the device comprises a power supply unit, a time delay unit, an alarm unit, an action unit and a feedback unit; the power supply unit supplies power for the action unit and the delay unit, the measurement and control device sends a remote control signal to the action unit, the delay unit works after the action unit acts, the delay unit controls the alarm unit to perform action alarm, and meanwhile, the action unit feeds back an action result to the measurement and control device;
the action unit comprises an intermediate relay, one end of a coil of the intermediate relay is connected with a remote control signal output end of the measurement and control device, the other end of the coil of the intermediate relay is connected with a negative electrode of the power supply unit, the delay unit comprises a charging capacitor, a triode, a delay resistor and a delay chip, the two ends of a first normally open contact of the intermediate relay are respectively connected with a positive electrode of the power supply unit and a positive electrode of the charging capacitor, the positive electrode of the charging capacitor is connected with a base of the triode, the negative electrode of the charging capacitor is connected with a negative electrode of the power supply unit, a collector of the triode is connected with a positive electrode of the power supply unit, the triode is connected with an input end of the delay chip, the delay resistor is connected between the input end of the delay chip and the negative electrode of the power supply unit, and the feedback unit is a normally closed contact and a second normally open contact of the intermediate relay are respectively connected with a remote signaling signal input end of the measurement and control device.
Preferably, the power supply unit comprises a plug connected with 220V alternating current, a power switch, a direct current inverter and a remote control loop switch which are sequentially connected.
Preferably, the delay chip is an NE555 timing integrated circuit, the input end of the delay chip is a trigger end 6 pin and a threshold end 2 pin, a power supply end 8 pin and a reset end 4 pin are connected with the positive electrode of the power supply unit, and the output end 3 pin is connected with the alarm unit.
Preferably, the alarm unit comprises a buzzer and an indicator lamp connected in series.
Preferably, the intermediate relay is an ohm dragon intermediate relay comprising two pairs of normally open normally closed nodes.
Preferably, the delay resistor comprises a fixed resistor and a sliding rheostat connected in series.
The beneficial effects of the invention include: the remote control outlet time of the measurement and control device can be prolonged, the remote control outlet time testing range is adjustable, and convenience is provided for the work of overhaulers. Meanwhile, the dispatching automation monitoring system can display the change condition of the remote control object in real time. The remote control loop tester of the measurement and control device enables the testing working efficiency of the remote control loop to be improved by 30%, greatly improves the overhaul efficiency of the power grid, and ensures the power supply reliability.
Drawings
FIG. 1 is a circuit diagram of a remote control loop tester of a measurement and control device in an embodiment of the invention;
fig. 2 is a circuit diagram of a feedback unit in an embodiment of the invention.
Detailed Description
In order to facilitate a tester to observe a remote control output result of a measurement and control device, the invention provides a remote control loop tester of the measurement and control device, and a preferred embodiment of the invention is described below with reference to the accompanying drawings of the specification.
The current power grid sends out a remote control signal from the dispatching center and transmits the remote control signal to the measurement and control device 104, the measurement and control device 104 controls the switch of the transformer substation to be switched on or off after passing through a remote control loop, the transformer substation switch can control the user to use electricity, after the transformer substation switch acts, the action signal is fed back to the measurement and control device 104 through a remote signaling loop, the measurement and control device 104 feeds back to the dispatching center, and the dispatching center determines that the operation is successful.
The remote control loop tester of the measurement and control device 104 in the embodiment of the invention replaces part of the transformer substation switch, so that the dispatching center does not directly control the transformer substation switch to cause the problem of power failure of a user in the test process, and the remote control loop can be tested without power failure. The remote control loop tester of the measurement and control device 104 needs to be connected with 220V alternating current mains supply, a power line of the tester is plugged into a power socket, then a remote control object, namely a remote control line and a shaking signal line of a transformer substation switch are removed, the remote control line of the remote control loop tester of the measurement and control device 104 is connected to a remote control signal output end of the measurement and control device 104, and the remote control line is two lines connecting the measurement and control device 104 in FIG. 1; the shaking signal line of the remote control loop tester of the measurement and control device 104 is connected to the shaking signal input end of the measurement and control device 104, and the remote signal line is shown in fig. 2, and two lines led out by a pair of normally open and normally closed contacts H3Y-3 of an intermediate relay H3Y are connected to the measurement and control device 104.
The following is a detailed structure of the remote control loop tester of the measurement and control device 104.
Referring to fig. 1 and 2, an embodiment of the present invention provides a remote control loop tester of a measurement and control device 104, including: the device comprises a power supply unit, a time delay unit, an alarm unit, an action unit and a feedback unit; the power supply unit supplies power to the action unit and the delay unit, the measurement and control device 104 sends a remote control signal to the action unit, the delay unit works after the action unit acts, the delay unit controls the alarm unit to perform action alarm, and meanwhile the action unit feeds back an action result to the measurement and control device 104.
The power supply unit comprises a plug connected with 220V alternating current, a power switch 101, a direct current inverter 102 and a remote control loop switch 103 which are sequentially connected. The action unit comprises an intermediate relay H3Y, and the intermediate relay H3Y is an ohm dragon intermediate relay H3Y comprising two pairs of normally open and normally closed nodes. One end of a coil of the intermediate relay H3Y is connected with a remote control signal output end of the measurement and control device 104, the other end of the coil is connected with a negative electrode of the power supply unit, the delay unit comprises a charging capacitor C, a triode VT, a delay resistor and a delay chip 105, two ends of a first normally open contact H3Y-1 of the intermediate relay H3Y are respectively connected with an anode of the power supply unit and an anode of the charging capacitor C, the anode of the charging capacitor C is connected with a base of the triode VT, the cathode of the charging capacitor C is connected with the negative electrode of the power supply unit, a collector of the triode VT is connected with the anode of the power supply unit, the emitter of the triode VT is connected with the input end of the delay chip 105, the delay resistor is connected between the input end of the delay chip 105 and the negative electrode of the power supply unit, and the delay resistor comprises a constant resistor R and a sliding rheostat PR which are connected in series. The output end of the delay chip 105 is connected with an alarm unit, specifically, the delay chip 105 is an NE555 timing integrated circuit, the input end of the delay chip is a trigger end 6 pin and a threshold end 2 pin, a power supply end 8 pin and a reset end 4 pin are connected with the positive electrode of the power supply unit, and an output end 3 pin is connected with the alarm unit. The alarm unit comprises a buzzer HA and an indicator light LED which are connected in series. The feedback unit is a normally closed contact H3Y-3 and a second normally open contact H3Y-2 of the intermediate relay H3Y, which are respectively connected with the remote signaling signal input end of the measurement and control device 104.
The material of the circuit board is selected to be convenient for welding and the glass fiber circuit board is convenient for use. The delay chip 105 of the device selects an NE555 (Timer IC) delay chip 105, the delay time is adjustable, and the remote control outlet time can be prolonged to 7-100 s. The intermediate relay H3Y adopts the 4 pairs of node ohm dragon intermediate relay H3Y, can provide two pairs of normally open nodes, and two pairs of normally closed nodes can accurately provide various nodes. The time adjusting knob selects the adjustable resistance knob, so that resistance adjustment can be rapidly performed, and the operation is convenient. The charging capacitor C adopts a common capacitor which is convenient for wiring, meets the requirement of a tester and is not influenced by electrostatic induction.
The tester shell adopts a firm and attractive plastic package steel plate, and the control switch of the tester selects a power button switch CBSY-330 with simple wiring and clear indication. The power module needs external 220V alternating current power supply access, a direct current 24V transmitter is arranged in the power module, and voltage conversion can provide long-time power supply for the tester. The indicator light LED is on when the instrument is operated, and the indicator light LED adopts AD16-22, is firm, durable and attractive, has high brightness and definite indication. The buzzer HA is small in size and loud, and accords with the continuous buzzer 3015A supported by the electric power of the tester, and is powered by direct current 24V. After the measurement and control screen, whether the remote control loop of the measurement and control device 104 at each corresponding interval is normal or not is tested. The tester verifies the remote control loop at each interval correctly and quickly, the testing time of the remote control loop is reduced from 15 minutes to 5 minutes, and the efficiency is improved by 33%.
Specifically, after the power supply is connected, the remote control line and the remote signaling line are connected, the power switch 101 and the remote control loop switch 103 are pressed, the dispatching center starts to send remote control signals, then remote control operation is executed, the buzzer HA sends out an alarm when the indicator light LED is on, and the time is more than 7s, so that the test experiment is successful.
The working principle of the intelligent power supply is that when the measurement and control device 104 receives signals, the corresponding node of the measurement and control device 104 is closed, the signal output end of the control device outputs signals, namely, the intermediate relay H3Y is electrified, after the coil of the intermediate relay H3Y is electrified, the first normally open contact H3Y-1 is closed, the charging capacitor C starts to charge, after the triode VT conduction current is reached, the output current of the triode emitter level is reached, the voltage of the two input ends of the NE555 starts to increase, when the output end 3 pin outputs a high level, the buzzer HA alarms, and the indicator lamp LED is lighted. The slide rheostat PR in the delay resistor is adjustable, when the total resistance value of the delay resistor is large, the delay resistor consumes large power, the charging capacitor C discharges quickly, and the delay time is short; when the total resistance of the delay resistor is small, the delay resistor consumes less power, the charging capacitor C discharges slowly, and the delay time is long; by adjusting the resistance of the slide rheostat PR, the delay time is adjusted to be 7 to 100 seconds. After the measurement and control device 104 receives the signal, the coil of the intermediate relay H3Y is electrified, and meanwhile, a pair of normally open and normally closed contacts of the intermediate relay H3Y are taken and connected with the remote signaling signal input end, the action result of the action unit at the moment is transmitted back, and the pair of normally open and normally closed contacts can ensure misoperation compared with a single contact, so that the accuracy of the test result is ensured.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. The utility model provides a measurement and control device remote control loop tester which characterized in that includes: the device comprises a power supply unit, a time delay unit, an alarm unit, an action unit and a feedback unit; the power supply unit supplies power for the action unit and the delay unit, the measurement and control device sends a remote control signal to the action unit, the delay unit works after the action unit acts, the delay unit controls the alarm unit to perform action alarm, and meanwhile, the action unit feeds back an action result to the measurement and control device;
the action unit comprises an intermediate relay, one end of a coil of the intermediate relay is connected with a remote control signal output end of the measurement and control device, the other end of the coil of the intermediate relay is connected with a negative electrode of the power supply unit, the delay unit comprises a charging capacitor, a triode, a delay resistor and a delay chip, the two ends of a first normally open contact of the intermediate relay are respectively connected with a positive electrode of the power supply unit and a positive electrode of the charging capacitor, the positive electrode of the charging capacitor is connected with a base of the triode, the negative electrode of the charging capacitor is connected with a negative electrode of the power supply unit, a collector of the triode is connected with the positive electrode of the power supply unit, the triode is connected with an input end of the delay chip, the delay resistor is connected between the input end of the delay chip and the negative electrode of the power supply unit, the output end of the delay chip is connected with an alarm unit, and the feedback unit is a normally closed contact and a second normally open contact of the intermediate relay are respectively connected with a remote signaling signal input end of the measurement and control device;
the delay chip is an NE555 timing integrated circuit, the input end of the delay chip is a trigger end 6 pin and a threshold value end 2 pin, the power supply end 8 pin and the reset end 4 pin are connected with the positive electrode of the power supply unit, the output end 3 pin is connected with the alarm unit, and the delay resistor comprises a fixed value resistor and a sliding rheostat which are connected in series.
2. The remote control loop tester of the measurement and control device according to claim 1, wherein the power supply unit comprises a plug for connecting 220V alternating current, a power switch, a direct current inverter and a remote control loop switch which are sequentially connected.
3. The remote control loop tester of a measurement and control device according to claim 1, wherein the alarm unit comprises a buzzer and an indicator lamp connected in series.
4. The measurement and control device remote control loop tester of claim 1, wherein the intermediate relay is an ohmmeter intermediate relay comprising two pairs of normally open and normally closed nodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392778.4A CN110187258B (en) | 2019-05-13 | 2019-05-13 | Remote control loop tester of measurement and control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392778.4A CN110187258B (en) | 2019-05-13 | 2019-05-13 | Remote control loop tester of measurement and control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110187258A CN110187258A (en) | 2019-08-30 |
| CN110187258B true CN110187258B (en) | 2024-04-02 |
Family
ID=67714491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910392778.4A Active CN110187258B (en) | 2019-05-13 | 2019-05-13 | Remote control loop tester of measurement and control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110187258B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000324687A (en) * | 1999-05-10 | 2000-11-24 | Uro Denshi Kogyo Kk | Power supply-breaking apparatus for saving power |
| CN2893811Y (en) * | 2006-04-07 | 2007-04-25 | 汪德宝 | Radio remote-control dialing antitheft alarm |
| CN202033630U (en) * | 2011-03-25 | 2011-11-09 | 杨健 | Electricity utilization time-limiting and timing control device for household appliances |
| CN103490504A (en) * | 2011-10-28 | 2014-01-01 | 安徽省电力公司芜湖供电公司 | Method for testing inter-station SOE through substation measuring and control device telecommand quantity testing system |
| CN103594290A (en) * | 2013-11-29 | 2014-02-19 | 山东三龙智能技术有限公司 | Control circuit for alternating current contactor |
| CN104155557A (en) * | 2014-09-04 | 2014-11-19 | 国家电网公司 | Special testing device for remote signaling and remote control of transformer substation |
| CN105486413A (en) * | 2014-09-16 | 2016-04-13 | 哈尔滨恒誉名翔科技有限公司 | Infrared temperature measurement alarm device |
| CN106774237A (en) * | 2016-11-18 | 2017-05-31 | 中国电力科学研究院 | A kind of observing and controlling remote control sluggish detection method and its system |
| CN107583262A (en) * | 2016-07-10 | 2018-01-16 | 郭洪 | Footrace based on 555 timers detects circuit in violation of rules and regulations |
| CN108439222A (en) * | 2018-05-10 | 2018-08-24 | 河钢股份有限公司承德分公司 | Crane remote control detects resetting apparatus, remote control system and crane automatically |
| CN208284068U (en) * | 2018-06-13 | 2018-12-25 | 国通（北京）电信工程有限公司 | A kind of fire-fighting alarm system in conjunction with security protection |
| CN208506207U (en) * | 2018-07-27 | 2019-02-15 | 广西电网有限责任公司柳州供电局 | A kind of terminal remote control circuit self-diagnosis unit switches |
| CN210270068U (en) * | 2019-05-13 | 2020-04-07 | 国网宁夏电力有限公司培训中心 | Remote control loop tester for measurement and control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7173428B2 (en) * | 2001-11-13 | 2007-02-06 | Hurwicz Maxim D | Portable circuit interrupter shutoff testing device and method |
-
2019
- 2019-05-13 CN CN201910392778.4A patent/CN110187258B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000324687A (en) * | 1999-05-10 | 2000-11-24 | Uro Denshi Kogyo Kk | Power supply-breaking apparatus for saving power |
| CN2893811Y (en) * | 2006-04-07 | 2007-04-25 | 汪德宝 | Radio remote-control dialing antitheft alarm |
| CN202033630U (en) * | 2011-03-25 | 2011-11-09 | 杨健 | Electricity utilization time-limiting and timing control device for household appliances |
| CN103490504A (en) * | 2011-10-28 | 2014-01-01 | 安徽省电力公司芜湖供电公司 | Method for testing inter-station SOE through substation measuring and control device telecommand quantity testing system |
| CN103594290A (en) * | 2013-11-29 | 2014-02-19 | 山东三龙智能技术有限公司 | Control circuit for alternating current contactor |
| CN104155557A (en) * | 2014-09-04 | 2014-11-19 | 国家电网公司 | Special testing device for remote signaling and remote control of transformer substation |
| CN105486413A (en) * | 2014-09-16 | 2016-04-13 | 哈尔滨恒誉名翔科技有限公司 | Infrared temperature measurement alarm device |
| CN107583262A (en) * | 2016-07-10 | 2018-01-16 | 郭洪 | Footrace based on 555 timers detects circuit in violation of rules and regulations |
| CN106774237A (en) * | 2016-11-18 | 2017-05-31 | 中国电力科学研究院 | A kind of observing and controlling remote control sluggish detection method and its system |
| CN108439222A (en) * | 2018-05-10 | 2018-08-24 | 河钢股份有限公司承德分公司 | Crane remote control detects resetting apparatus, remote control system and crane automatically |
| CN208284068U (en) * | 2018-06-13 | 2018-12-25 | 国通（北京）电信工程有限公司 | A kind of fire-fighting alarm system in conjunction with security protection |
| CN208506207U (en) * | 2018-07-27 | 2019-02-15 | 广西电网有限责任公司柳州供电局 | A kind of terminal remote control circuit self-diagnosis unit switches |
| CN210270068U (en) * | 2019-05-13 | 2020-04-07 | 国网宁夏电力有限公司培训中心 | Remote control loop tester for measurement and control device |
Non-Patent Citations (2)
| Title |
|---|
| 主动式红外线探测报警系统在监狱安全工作的设计;李克强;《中国优秀硕士学位论文全文数据库信息科技辑》(第5期);第I140-270页 * |
| 电磁阀检测仪的设计和应用;马亮;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》(第2期);第C035-40页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110187258A (en) | 2019-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110554351A (en) | real load detection method and system of non-invasive load electric energy meter | |
| CN111880516A (en) | Automatic detection device and method based on lithium battery controller of electric vehicle | |
| CN110609190A (en) | Relay protection device outlet checking instrument and method thereof | |
| CN210270068U (en) | Remote control loop tester for measurement and control device | |
| CN209591246U (en) | A kind of three-phase three-wire electric energy meter device for simulating false wiring with self-checking function | |
| CN110187258B (en) | Remote control loop tester of measurement and control device | |
| CN108020748B (en) | Cable testing device | |
| CN211426651U (en) | Relay protection device export check-up instrument | |
| CN204882853U (en) | Electric energy meter pressure resistance test installation | |
| CN110596522A (en) | Portable wireless current transformer polarity testing device | |
| CN110609184A (en) | Comprehensive experimental device and method for relay protection of power system | |
| CN110208599A (en) | A kind of electric energy meter with detection function | |
| CN103092184B (en) | A kind of automatic testing stand of integrated protection and monitoring device | |
| CN104237838A (en) | Metering working voltage drop automatic test platform and voltage drop modes | |
| CN112858881A (en) | Circuit fault overhauling device for electronic technology major | |
| CN211123224U (en) | Portable wireless current transformer polarity testing device | |
| CN212229071U (en) | Instrument aging testing cabinet | |
| CN203673059U (en) | Three-phase electric energy meter simulation system | |
| CN103487752B (en) | A kind of electromagnetic relay microcomputer debugging instrument | |
| CN208872836U (en) | Mutual inductor is wireless polarity tester | |
| CN108418284B (en) | Working power supply circuit | |
| CN207502984U (en) | A kind of portable intelligent actuating of relay power measuring | |
| CN212275868U (en) | Terminal data acquisition module | |
| CN219245718U (en) | Dual-power change-over switch checking device | |
| CN104749546A (en) | Novel type-III specific power transformer acquisition terminal testing device and testing method thereof |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |