CN203232119U - High-voltage test grounding intelligent early warning control device - Google Patents
High-voltage test grounding intelligent early warning control device Download PDFInfo
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- CN203232119U CN203232119U CN 201320012299 CN201320012299U CN203232119U CN 203232119 U CN203232119 U CN 203232119U CN 201320012299 CN201320012299 CN 201320012299 CN 201320012299 U CN201320012299 U CN 201320012299U CN 203232119 U CN203232119 U CN 203232119U
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000002474 experimental method Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 12
- 239000004973 liquid crystal related substance Substances 0.000 claims description 11
- 238000004382 potting Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004832 voltammetry Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
A high-voltage test grounding intelligent early warning control device mainly comprises a CPU controller, a grounding resistance measuring loop, a control loop, a voice alarm system, a LCD display and a small keyboard; the CPU controller is connected with a DC voltammetry grounding resistance measuring loop formed by a differential voltage measuring circuit among DC constant current output, grounding and auxiliary grounding points, and timing interruption and triggering are carried out by the CPU controller so as to carry out resistance timing measurement; the CPU controller is connected with a control loop output employing a CPU controller I/O interface to connect with a relay and a contactor controlling on/off of test power; the CPU controller is configured with the keyboard connected with an CPU controller interface for realizing relative operation and resistance set value arrangement; and the high-voltage test grounding intelligent early warning control device can arrange the set value, realizes measurement display of grounding resistance in real time, and controls test power in real time.
Description
Technical field
The utility model relates to a kind of grounding intelligent prior-warning device in the power industry checking experiment, be mainly used in monitoring checking experiment work before, the ground connection situation in the work, the personal device security of the correct and protection test of warranty test data.
Background technology
In the electric power overhaul process of the test, test ground connection reliably and be the assurance of the accurate and personal device security of test figure.Therefore, the grounding requirement to test in the checking experiment is very high, and requirement test ground connection is reliable, stake resistance need satisfy the correlation test condition.But at present owing to influenced by device type, new maintenance mode method etc., there are the following problems:
1) can't guarantee the reliability of ground connection in the process of the test at upkeep operation scene.
In checking experiment, because following problem usually appears in artificial factor: 1. not correctly reliably to test specimen and instrument ground; 2. misoperation causes ground connection coming off; 3. the people is maloperation, and mistake has been torn ground wire open.4. checking experiment though can measure its resistance every 2 years, can not be grasped the resistance of grounded screen for the grounded screen of electric substation in real time, can not guarantee the state of grounded screen when checking experiment, guarantees the reliability of checking experiment ground connection.In a word, be subjected to the earth-continuity situation, ground wire of earth point whether good, the whether influence of factor such as firm of ground connection, losing ground connection or ground connection when defective, experiment power supply is conducting still, and personnel and device security can not get ensureing, the accuracy of test figure also can be affected.
2) secondly, the raising along with electric reliability requires for large-scale centralized maintenance occasion, usually is required to shorten the working time of test as far as possible, recovers as early as possible to send.Generally tested high-tension apparatus being concentrated on a certain suitable zone in the service work tests.Because the place is away from the switch cubicle that overhauls, earthing mode then often adopts clip nearby on switch board housing or the cabinet screw, lack of standardization and poor reliability.
3) moreover, by clip be connected to ground connection bronze medal or shell, screw fashion all is insecure earthing mode, all exists clip to come off or artificial phenomenon such as disconnection, does not meet the requirement of the correct test determination of safety.
Along with the development of intelligent grid, status of electric power maintenance, on-line monitoring technique are had higher requirement the incompatibility development of today of traditional test earthing mode:
1) repair based on condition of component, on-line monitoring technique are online charged detection technique, testing equipment is in the electrification in high voltage district, if test imperfect earth easily produces induced voltage, particularly when system breaks down, even can produce induction (suspension) voltage up to tens thousand of volts.Therefore, for personal device security, require the necessary reliable ground of test; Otherwise need in time to cut off experiment power supply.
2) simultaneously, correct for the warranty test data also explicitly calls for (generally requiring less than 0.5 ohm) to the test stake resistance, can't measure the reliability of assurance checking experiment ground connection in traditional test to the stake resistance of grounded screen;
3) on the other hand, even ground connection was good at that time, but Jiaxing surface layer water level higher (0.5 meter of water level), bigger to the corrosion of substation ground net, may cause the stake resistance regulation that is above standard (to be annotated, checking experiment rules regulation, substation ground resistance need test every two years once, exceed standard to prevent the stake resistance corrosion).
The utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, and provide a kind of checking experiment for power industry, can measure the stake resistance in the checking experiment in real time, automatically relatively the stake resistance of surveying and setting value size, and according to the automatic call through test power supply of comparative result or cut-out experiment power supply, to ensure the checking experiment grounding intelligent prior-warning device of reliable ground in the checking experiment.
The purpose of this utility model is finished by following technical solution, it mainly comprises: cpu controller, grounding resistance measurement loop, control loop, phonetic warning system, LCD display and keypad, described cpu controller connects a dc va method grounding resistance measurement loop with direct current constant current output, ground connection and auxiliary earth point differential voltage metering circuit formation, carries out resistance by cpu controller timing down trigger and regularly measures;
Described cpu controller connects control loop, and described cpu controller adopts the I/O mouth to connect relay and the contactor of control experiment power supply break-make;
Described cpu controller disposes a keyboard that is connected with the cpu controller interface;
Described cpu controller is also connecting the phonetic warning system of realizing setting definite value, detecting the LCD display of resistance demonstration and connect, realize when disconnecting the different phonetic alarm at experiment power supply respectively.
Cpu controller described in the utility model adopt atmel corp, can measure in real time the test stake resistance and with institute's measuring resistance and the safety value that sets relatively, according to surpass or less than the time cut off automatically or 8 single chip computer AT mega128L of call through test power supply by control loop; Described cpu controller and LCD display with the driving Liquid Crystal Module be connected.
LCD display described in the utility model is selected the HGS122321-LYH liquid crystal chip, and described phonetic warning system adopts has the sound chip ISD1110/1420 of recording and reproducing function, and is combined with the loudspeaker of audio power amplifier circuit AD7705BR and power 8W; Described keyboard is selected the 2510-06 keyboard, and is connected with the cpu controller interface.
The utility model can detect stake resistance in the checking experiment, and intelligent early-warning device that can safe call through test power supply in real time, ensures the reliable ground in the checking experiment; The utility model is according to measured stake resistance, and automatic and setting value compares.When institute's measuring resistance during less than setting value, think that ground connection is reliable or stake resistance is qualified, call through test power supply automatically, otherwise ground connection is unreliable or stake resistance is defective, cuts off experiment power supply automatically; The utility model can also be measured the stake resistance of checking experiment in real time, and by the liquid crystal display resistance value; Can also select different audio alerts automatically according to the comparative result of survey stake resistance and setting value.
The utility model has realized testing in the power high voltage test the real-time detection to the testing equipment reliable ground, real-time early warning, specifically by following technique effect:
1) in the checking experiment, real-time measurement of Grounding Resistance, whether detect test ground connection qualified, reliable; The grounding resistance measurement precision can reach 0.1 ohm;
2) be switched on or switched off experiment power supply automatically, automatic call through test power supply when detection ground connection is qualified, otherwise cut off experiment power supply automatically; Can reach break time in 1 second;
3) according to the comparative result of survey stake resistance and setting value, can select different audio alerts automatically;
4) being used for setting value relatively can set, and sets according to different tests scene, different places, and set definite value and actual measurement resistance are shown in real time by liquid crystal; Range of set value can be at 0 ~ 20 ohm.
Description of drawings
Fig. 1 is structural principle synoptic diagram of the present utility model.
Fig. 2 is the schematic diagram in a kind of resistance measurement described in the utility model loop.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail: shown in Figure 1, the utility model mainly comprises: cpu controller 1, grounding resistance measurement loop 2, control loop 3, phonetic warning system 4, LCD display 5 and keyboard 6, described cpu controller 1 connects a dc va method grounding resistance measurement loop 2 with direct current constant current output, ground connection and auxiliary earth point differential voltage metering circuit formation, carries out resistance by cpu controller 1 timing down trigger and regularly measures;
Described cpu controller 1 connects control loop 3, and described cpu controller adopts the I/O mouth to connect relay and the contactor of control experiment power supply break-make;
Described cpu controller 1 disposes a keyboard 6 that is connected with the cpu controller interface;
Described cpu controller 1 is also connecting the phonetic warning system 4 of realizing setting definite value, detecting the LCD display 5 of resistance demonstration and connect, realize when disconnecting the different phonetic alarm at experiment power supply respectively.
Cpu controller described in the utility model 1 adopt atmel corp, can measure in real time the test stake resistance and with institute's measuring resistance and the safety value that sets relatively, according to surpass or less than the time cut off automatically or 8 single chip computer AT mega128L of call through test power supply by control loop; Described cpu controller 1 and LCD display 5 with the driving Liquid Crystal Module be connected, LCD display 5 response keyboards inputs also show the actual measurement resistance value.
Among Fig. 1, also has JAT debugging interface 7, AC220V power supply input 8, out-put supply plug-in strip 9, auxiliary supply transformer 10, earth leakage protective device 11, power supply output 12.
Embodiment:
The utility model mainly comprises: cpu controller 1, grounding resistance measurement loop 2, control loop 3, LCD display 4, phonetic warning system 5 and keyboard 6.
Described cpu controller 1 is the control center of whole device, adopt 8 single chip computer AT mega128L of atmel corp, it measures the test stake resistance in real time, and with institute's measuring resistance and the safety value comparison that sets, according to surpass or less than the time, cut off automatically or the call through test power supply by control loop; Simultaneously, CPU also drives the keyboard circuit response and receives the keyboard input, so that set the ground connection reference value; On the other hand, CPU drives Liquid Crystal Module, and the input of response keyboard also shows actual measurement resistance value etc.
2 designs dc va method resistance measuring module based on differential voltage metering circuit between 0.5A direct current constant current output, ground connection and the auxiliary earth point in grounding resistance measurement loop adopts 12 AD modules, and the resistance measurement precision reaches 1 milliohm.Be grounded the measurement of detection and resistance value thereof.Carry out resistance by CPU timing down trigger and regularly measure, sense cycle can be less than 100 milliseconds in real time.Shown in Figure 2 is the schematic diagram in a kind of resistance measurement loop, belongs to a kind of of the utility model embodiment, and wherein diagramatic content is the content of the utility model embodiment.
3 I/O mouths that adopt CPU of control loop, by relay and contactor control experiment power supply break-make, make-and-break time was less than 1 second.
Keyboard 6 is selected the 2510-06 keyboard, by 4-keystroke input method and cpu i/f design, realizes the setting of associative operation and resistance definite value.
The utlity model has following several function:
1) in the checking experiment, real-time measurement of Grounding Resistance, whether detect test ground connection qualified, reliable;
2) be switched on or switched off experiment power supply automatically.Automatic call through test power supply when detection ground connection is qualified, otherwise cut off experiment power supply automatically.
3) device is selected different audio alerts automatically according to the comparative result of survey stake resistance and setting value.
4) being used for setting value relatively can set, and sets according to different tests scene, different places, and set definite value and actual measurement resistance are shown in real time by liquid crystal.
Claims (3)
1. high-potting grounding intelligent early warning control device, it mainly comprises: cpu controller, grounding resistance measurement loop, control loop, phonetic warning system, LCD display and keypad, it is characterized in that described cpu controller connects a dc va method grounding resistance measurement loop with direct current constant current output, ground connection and auxiliary earth point differential voltage metering circuit formation, carries out resistance by cpu controller timing down trigger and regularly measures;
Described cpu controller connects control loop, and described cpu controller adopts the I/O mouth to connect relay and the contactor of control experiment power supply break-make;
Described cpu controller disposes a keyboard that is connected with the cpu controller interface;
Described cpu controller is also connecting the phonetic warning system of realizing setting definite value, detecting the LCD display of resistance demonstration and connect, realize when disconnecting the different phonetic alarm at experiment power supply respectively.
2. high-potting grounding intelligent early warning control device according to claim 1, it is characterized in that described cpu controller adopt atmel corp, can measure in real time the test stake resistance and with institute's measuring resistance and the safety value that sets relatively, according to surpass or less than the time cut off automatically or 8 single chip computer AT mega128L of call through test power supply by control loop; Described cpu controller and LCD display with the driving Liquid Crystal Module be connected.
3. high-potting grounding intelligent early warning control device according to claim 1 and 2, it is characterized in that LCD display selection HGS122321-LYH liquid crystal chip, described phonetic warning system adopts has the sound chip ISD1110/1420 of recording and reproducing function, and is combined with the loudspeaker of audio power amplifier circuit AD7705BR and power 8W; Described keyboard is selected the 2510-06 keyboard, and is connected with the cpu controller interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320012299 CN203232119U (en) | 2013-01-10 | 2013-01-10 | High-voltage test grounding intelligent early warning control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320012299 CN203232119U (en) | 2013-01-10 | 2013-01-10 | High-voltage test grounding intelligent early warning control device |
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| CN203232119U true CN203232119U (en) | 2013-10-09 |
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| CN 201320012299 Expired - Fee Related CN203232119U (en) | 2013-01-10 | 2013-01-10 | High-voltage test grounding intelligent early warning control device |
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2013
- 2013-01-10 CN CN 201320012299 patent/CN203232119U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20200110 |