CN201327463Y - Comprehensive parameter tester for SF 6 density electrical relay - Google Patents
Comprehensive parameter tester for SF 6 density electrical relay Download PDFInfo
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- CN201327463Y CN201327463Y CNU2008202195606U CN200820219560U CN201327463Y CN 201327463 Y CN201327463 Y CN 201327463Y CN U2008202195606 U CNU2008202195606 U CN U2008202195606U CN 200820219560 U CN200820219560 U CN 200820219560U CN 201327463 Y CN201327463 Y CN 201327463Y
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Abstract
The utility model discloses a comprehensive parameter tester for an SF 6 density electrical relay, which consists of a density electrical relay checking device, a brackish water content testing device and a circuit controlling device. The density electrical relay checking device is that a plate valve is connected with the density electrical relay, a gas cylinder is connected with a density gas circuit to be tested through a gas cylinder valve, and the density gas circuit to be tested is connected with a drive mechanism through the gas cylinder and the gas cylinder valve, and a pressure sensor is connected with the density gas circuit to be tested. The brackish water content testing device is that an air outlet is connected with the density gas circuit to be tested through a flow meter, and the plate valve and a humidity sensor are connected with the density gas circuit to be tested. The circuit controlling device is that a keyboard is connected with a single chip, an A / D sampling circuit and a switching sampling circuit are respectively connected with an input port of the single chip, the input port of the single chip is connected with a liquid crystal display device, a motor drive circuit, a micro-printer and a data storage circuit. The device can automatically carry out the real-time testing, and the pressure adjustment can be completed by using the motor to drive the piston cylinder for improving the work efficiency. The comprehensive parameter tester has the advantages that the air tightness is good, no exhaust gas is discharged into the outside in the testing process, and the device is environmentally friendly.
Description
Technical field
It is SF that the utility model relates to a kind of employing sulfur hexafluoride
6As the isolating switch integral test system of insulating medium, can finish SF
6The verification of density monitor table and SF in the isolating switch
6The detection of gas micro-water content is specifically related to the design that high-accuracy data acquisition and robotization detect control module, belongs to fault diagnosis and pick-up unit.
Background technology
Now, adopt SF
6Electrical equipment as insulating medium mainly contains isolating switch, transformer, cable, GIS station etc.The equipment of 220V electric pressure has employing SF over half approximately
6Gas-insulated; The equipment of 330V electric pressure 100% adopts SF nearly
6Gas-insulated; The equipment of 550V electric pressure and GIS all adopt SF
6Gas-insulated; In 110KV and above newly-built power transmission and transforming equipment and urban network restructuring, SF
6Equipment becomes first-selection.
Density monitor is SF
6The important composition parts of equipment, SF
6Density monitor is in recent years at SF
6A kind of new type of safe protection aut.eq. of widespread use is a kind of pressure controller with temperature compensation, at present mainly based on the mechanical type density monitor in the electrical equipment.Its main effect is to detect SF in the electrical equipment body
6The variation of gas density.If SF
6Gas takes place to leak or liquefaction, and density monitor can send alerting signal by the protection loop.If density further descends, latch switch will move, with protection equipment, prevent the generation of accident.The density monitor table comes the density of gas in the indication equipment with pressure.In order to get rid of the influence that temperature variation causes pressure, density monitor has the temperature compensation means compensation temperature and changes the influence that brings.Therefore, density monitor is actually a manometer with temperature compensation function.To sum up, the accuracy of density monitor and reliability are the important leverages that is related to electrical equipment and power grid security, and it all is very necessary checking the reliability of its work and accuracy.
SF
6Moisture in the gas also is SF
6An important indicator of electrical equipment, high its insulating property that influence of moisture.SF
6Gas can produce pulverous sediment after electric arc decomposes, be semi-conductive characteristic after these precipitated solid are made moist, and insulating property are declined to a great extent.In actual motion, the approach that moisture enters breaker apparatus is a lot.For example, the SF that newly charges into
6Itself contains micro-moisture gas; The moisture that part of appliance adsorbs in the course of the work etc., these factors all may cause SF
6Gas water content exceeds standard.SF
6Moisture in the equipment generally is micro-, so the measurement of its water cut is called little water gaging.SF
6The little water yield of gas is SF equally
6The important parameter of gaseous state.
SF in the market
6Density monitor calibration equipment automaticity is very low, when using, instrument need external gas bomb and manual adjustments pressure just can finish test, and detect required gas at every turn and after being used to complete, all enter in the air, not only air consumption is big but also environment also polluted.In addition, the existing equipment universal functionality is single, carries out little water as need and detects, and then needs equipment in addition, makes troubles to test.
Summary of the invention
The purpose of this utility model is to provide a kind of SF
6The density monitor comprehensive parameter tester, this equipment has SF
6Density monitor verification and two kinds of functions of micro-water content test, the automaticity height, gas does not have leakage.
This device can be realized SF
6The robotization verification of density monitor judges whether the relay table is working properly, and whether the gaseous tension the when warning of relay table is exported with block signal conforms to rating number;
Realization is to SF
6The test of equipment gas micro-water content judges whether the gas micro-water content meets the requirements;
Instrument can be stored the result of each test, can carry out the inquiry of historical data, and is furnished with the mini-printer output data.
The technical solution of the utility model is as follows:
Technical scheme of the present invention is made of whole gas circuit scheme and circuit control device;
Above-mentioned whole gas circuit is made up of density monitor calibration equipment and micro-water content proving installation two parts; Said density monitor calibration equipment is that density monitor connects the panel valve, this valve connects tested density gas circuit, gas-holder connects tested density gas circuit through the gas storage pot valve, and driving mechanism connects tested density gas circuit through cylinder, cylinder valve, and pressure transducer inserts above-mentioned tested gas circuit; Described micro-water content proving installation is that the gas outlet connects tested gas circuit through flowmeter, and the panel valve connects tested gas circuit, and humidity sensor inserts tested gas circuit;
Circuit control device is made of primary controller, liquid crystal display, keyboard, motor-driven, mini-printer, data storage, A/D sampling, switch acquisition and power supply; Power supply, keyboard insert the primary controller that is made of the ATmega128 single-chip microcomputer, A/D sample circuit, switch acquisition circuit connect above-mentioned input of single chip respectively, and this single machine output end connects liquid crystal indicator, motor-drive circuit, mini-printer, data storage circuitry.
The power supply of foregoing circuit control device, keyboard insert the primary controller of the core ATmega128 single-chip microcomputer formation of this device, the A/D sample circuit is made of integrated circuit ADS7841 and peripheral cell thereof, 2,3 pin of this integrated circuit connect humidity, the pressure signal of sensor acquisition, 12,13,14,15,116 pin connect 17,16,15,32 pin of above-mentioned single-chip microcomputer respectively, this circuit also has temperature sampling circuit, it is a digital temperature chip DS1620, and its 1,2,3 pin connect 29,30,31 pin of single-chip microcomputer; The switch acquisition circuit adopts optocoupler TLP521-4 to realize, TLP521-4 includes four road photoelectricity coupled circuits, gather low pressure alarming, alarm for high voltage, locking 1 and 2 four groups of switching values of locking respectively, its optocoupler pin 1,2 links to each other with switch, 16,14,12, the 10 pin output of optocoupler TLP521-4,6,7,8,9 pin of access single-chip microcomputer; The output termination liquid crystal indicator LCD of single-chip microcomputer, it is to be the Liquid Crystal Module of core with the T6963C controller, 51,50,49,48,47,46,45, the 44 pin output of single-chip microcomputer, 10,11,12,13,14,15,16,17 pin of access T6963C; Adopting integrated circuit 24LC512 is data storage circuitry, and these circuit 5,6 pin insert 42,41 pin of above-mentioned single-chip microcomputer; Motor-drive circuit is the pulse input end that the PWM pin of monolithic counter 0 inserts driver, and 37 pin with single-chip microcomputer link to each other with the direction control end of driver simultaneously, and single-chip microcomputer connects mini-printer.
This device rotates by the control circuit drive stepping motor and drives the piston-cylinder motion, thereby realize density monitor inflation and venting automatically, sample circuit pick-up transducers signal in charging and discharging the process of gas, obtain locking and alarm pressure value through after the processor processing, the ratings of this value and tested density monitor can be judged relatively whether density monitor is working properly, and whole test process is carried out fully automatically under the control of circuit control device.Simultaneously, the function of humidity measurement that this tester is integrated can be carried out the measurement of gas humidity.
Advantage of the present utility model is: 1, the density monitor check test has the ability of automatic test, utilizes the driven by motor piston-cylinder to finish the adjusting of pressure, need not manual adjustments.2, impermeability is good, and the gas in the instrument is stored in after test is finished in the gas-holder all the time, and test process to extraneous emission gases, is not beneficial to environmental protection.3, anti-preferably electromagnetic interference (EMI) circuit design is adopted in the main electronic modular unit design of equipment, gets rid of the influence of electromagnetic interference (EMI).4, the instrument purposes is various, can carry out two kinds of tests of density monitor verification and micro-water content.
Description of drawings
Fig. 1 is the utility model density monitor verification gas circuit synoptic diagram;
Fig. 2 is the little water test of a utility model gas circuit synoptic diagram;
Fig. 3 is the utility model density monitor check test process flow diagram;
Fig. 4 is the little water test flow chart of the utility model;
Fig. 5 is the utility model circuit control device circuit block diagram;
Fig. 6 is the utility model primary controller single chip circuit schematic diagram;
Fig. 7 is the utility model liquid crystal interface circuit theory diagrams;
Fig. 8 is the utility model data storage circuitry schematic diagram;
Fig. 9 is the utility model A/D sample circuit schematic diagram;
Figure 10 is the utility model optocoupler inner structure synoptic diagram
Figure 11 is the utility model switch acquisition circuit theory diagrams;
Figure 12 is the utility model temperature collection circuit schematic diagram;
Figure 13 is the utility model serial communication circuit schematic diagram;
Figure 14 is the utility model driver and single-chip microcomputer connecting interface circuit theory diagrams.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Can see that by Fig. 1-2 the gas circuit of this device is made up of density monitor calibration equipment and micro-water content proving installation two parts; Said density monitor calibration equipment is that density monitor 1 connects panel valve 2, this valve connects tested density gas circuit, gas-holder 8 connects tested density gas circuit through gas storage pot valve 4, and driving mechanism 7 connects tested density gas circuit through cylinder 6, cylinder valve 5, and pressure transducer 3 inserts above-mentioned gas circuit; Described micro-water content proving installation is that gas outlet 11 connects tested gas circuit through flowmeter 10, and panel valve 2 connects tested gas circuit, and humidity sensor 9 inserts tested gas circuit.
This device totally is divided into two-layer, and bottom is a mechanical mechanism, comprises cylinder, stepper motor and leading screw slide block mechanism, and gas circuit loop and circuit part are then placed in the upper strata.Connect by support between two-layer, be covered with instrument panel topmost.Instrument integral body places in the instrument container, and cabinet design becomes the pull bar pulley-type, equally can spur easily with common luggage case.External 220V alternating current during the instrument use only needs before the test gas circuit is connected to test port, and the switch acquisition socket of switch acquisition signal introducing panel is got final product.
Fig. 3, Fig. 4 are respectively density monitor check test process flow diagram and little water test flow chart, at first instrument are connected with tested density gas circuit when carrying out the density monitor check test, open panel valve, the gentle cylinder valve of gas storage pot valve.Gas-holder has big volume, has stored the gas of testing required certain pressure in advance.After opening three valves, tested density monitor table, gas-holder and piston-cylinder form and are communicated with gas circuit, have identical pressure.Close the gas storage pot valve then, the control circuit drive stepping motor drives cylinder piston and moves the rated pressure that the air pressure in the gas circuit is adjusted to density monitor, the driven by motor piston moves the gas circuit internal gas pressure is descended then, when air pressure drops to the alarm set point of density monitor table and locking point, density monitor output switching value signal, the gas circuit pressure that instrument is gathered this signal and read signal when taking place can obtain measured value.The ratings contrast of measured value and density monitor can be judged whether density monitor is working properly.After test finishes, open the gas storage pot valve, the driven by motor piston pushes back gas-holder with gas, closes all valves then and finishes test.At first equipment under test is connected with the humidity measurement mouth during humidity measurement, opens valve then and make tested gas flow into gas circuit, regulate flowmeter gas flow is reached about 0.6L/min, can finish test.
Can see that by Fig. 5-14 circuit control device mainly is made up of primary controller, liquid crystal display, keyboard, motor-driven, mini-printer, data storage, A/D sampling, switch acquisition and power supply.Below its chief component is introduced.
Can see the primary controller of this circuit control device by Fig. 6, its adopts ATmega128 single-chip microcomputer.
Can see with the T6963C controller being the annexation of the Liquid Crystal Module and the single-chip microcomputer of core by Fig. 7, wherein, pin 21 output negative pressure are connected to pin 4 after the slide rheostat dividing potential drop.Pin 19,20 is used for lighting the backlight of Liquid Crystal Module.Pin 10-17 is 8 position datawires, and pin 5,6 is respectively and writes, read control signal, and pin 7 is sheet choosing end, and pin 8 is the channel selecting end, and selection instruction passage when single-chip microcomputer exports 1 is exported and selected data channel at 0 o'clock.
Can see the 24LC512 circuit by Fig. 8, data storage function is user's test data to be preserved be convenient to the follow-up inquiry of user, has therefore selected for use 24LC512 as outside eeprom chip in the design.This chip capacity is 512 kilobits, i.e. 64K.24LC512 has the write-protect function, and the read-write number of times is up to 1000000 times.24LC512 adopts the I2C bus communication, has multiple read-write modes such as byte writes, whole page or leaf writes, byte reads, whole page or leaf reads.I/O port Simulation with I 2C bus timing and chip with single-chip microcomputer in the application communicate, and finish read-write operation.
Can see the circuit of A/D sampling module by Fig. 9, the A/D sample circuit mainly is a signal of gathering pressure and humidity sensor output, temperature signal is gathered by digital temperature chip DS1620, pressure transducer adopts the CERALINE-S pressure unit, the output of 4-20mA two-wire system, measurement range 0-1MPa, 0.25 grade of precision.Humidity sensor adopts DMT142 dew point transmitter, and scope-60-60 ℃ of dew point measured in the output of 4-20mA two-wire system, accuracy ± 3 ℃.Owing to only need gather two paths of signals, and single-chip microcomputer residue pin is limited, has therefore selected 4 tunnel serial AD chip ADS7841 for use.ADS7841 adopts synchronous serial interface, only has 5 pins to link to each other with single-chip microcomputer.The passage 0 of ADS7841 and passage 1 are gathered the signal of humidity and pressure transducer respectively.Because humidity and pressure transducer are the output of 4-20mA electric current, the sampling resistor that has therefore connected 250 Ω is respectively sampled.
Can see the switch acquisition circuit by Figure 10,11, the switch acquisition module is gathered the warning and the block signal of density monitor.The collection of switching value adopts optocoupler TLP521-4 to realize.TLP521-4 includes four road photoelectricity coupled circuits, and its inner structure synoptic diagram is simplification repeat specification as shown in figure 10, and this figure only is the structural drawing of one road light lotus root.Pin 1,2 links to each other with switch, and pin 4 is pulled to 5V, pin 3 ground connection through pull-up resistor.When switch is not closed, pin 3,4 access failures, 4 pin output high level, during switch closure, 3,4 conductings, pin 4 output low levels.Four road light lotus roots are arranged among Figure 11, gather low pressure alarming, alarm for high voltage, locking 1 and 2 four groups of switching values of locking respectively. Input end pin 1,3,5,7 inserts current-limiting resistance R25-27, and output terminal pin 16,14,12,10 is through resistance R
28-31Be pulled to VCC (supply voltage).Therefore, when switch does not have closure, output high level, output low level when switch closure.For most of density monitors, have only locking and two groups of switching values of warning to need to gather.Also there is the partial density relay to contain alarm for high voltage, is used for the prompt facility hypertonia, and contain two locking points.Therefore, in order to expand the usable range of instrument, gathered the four-way switch amount.
Can see temperature acquisition and serial communication circuit by Figure 12,13, temperature acquisition is realized by the DS1620 temperature collection circuit.Digital temperature sensor DS1620 is the novel temperature sensor that American Dallas company produces, and it is with digital quantity output temperature measured value, characteristics such as have that measurement range is wide, long transmission distance, temperature are reliable.Can be connected with PC or single-chip microcomputer with serial mode easily, form intelligent temperature measuring instrument or intelligent temperature detection system.The key technical indexes: temperature-measuring range is-55 ℃～+ 125 ℃, resolution can reach 0.5 ℃, temperature is exported with 9 bit digital, and the numerical value conversion DS1620 that can finish dut temperature in 1s realizes that by the pulse number of high temperature coefficient oscillator control low-temperature coefficient oscillator the numeral of dut temperature measures.At first, the temperature register sum counter presets-55 ℃ reference value, if temperature register and counter were 0 before the recurrence interval finishes, then temperature register increases number, and the numerical value in temperature register is the dut temperature value.This chip and single-chip microcomputer are by data, clock and the three-way communication of finishing that resets.Serial communication circuit is mainly used in being connected of tester and host computer, is convenient to expand in the future.The serial communication function adopts MAX232 level transferring chip commonly used to finish, and it connects as shown in figure 13, realizes communication with host computer with the serial ports 0 of single-chip microcomputer.
Can see the driver interface circuit by Figure 14, the selected motor of this instrument is the 56BYG25C-SASSBL-0241 model two-phase hybrid stepping motor of company when closing profit, selects the SH-20403 two-phase hybrid stepping motor subdivision driver with this electric drilling match.Seven kinds of optional segmentation patterns of maximum 64 segmentations.The control aspect, utilize the PWM pin of monolithic counter 0 to produce the PWM ripple, this signal is input to the pulse input end of driver, PC2 mouth with single-chip microcomputer links to each other with the direction control end of driver simultaneously, motor just changes when the CW of PC2 mouth pin output high level, motor counter-rotating when the CW of PC2 mouth pin output low level.
Claims (2)
1, SF
6The density monitor comprehensive parameter tester is characterized in that: it is made of whole gas circuit scheme and circuit control device;
Above-mentioned whole gas circuit is made up of density monitor calibration equipment and micro-water content proving installation two parts; Said density monitor calibration equipment is that density monitor (1) connects panel valve (2), this valve connects tested density gas circuit, gas-holder (8) connects tested density gas circuit through gas storage pot valve (4), driving mechanism (7) connects tested density gas circuit through cylinder (6), cylinder valve (5), and pressure transducer (3) inserts above-mentioned tested gas circuit; Described micro-water content proving installation is that gas outlet (11) connects tested gas circuit through flowmeter (10), and panel valve (2) connects tested gas circuit, and humidity sensor (9) inserts tested gas circuit;
Circuit control device is made of primary controller, liquid crystal display, keyboard, motor-driven, mini-printer, data storage, A/D sampling, switch acquisition and power supply; Power supply, keyboard insert the primary controller that is made of the ATmega128 single-chip microcomputer, A/D sample circuit, switch acquisition circuit connect above-mentioned input of single chip respectively, and this single machine output end connects liquid crystal indicator, motor-drive circuit, mini-printer, data storage circuitry.
2, according to the described SF of claim 1
6The density monitor comprehensive parameter tester, it is characterized in that: the power supply of its circuit control device, keyboard insert the primary controller of the core ATmega128 single-chip microcomputer formation of this device, the A/D sample circuit is made of integrated circuit ADS7841 and peripheral cell thereof, 2,3 pin of this integrated circuit connect humidity, the pressure signal of sensor acquisition, 12,13,14,15,16 pin connect 17,16,15,32 pin of above-mentioned single-chip microcomputer respectively, this circuit also has temperature sampling circuit, it is a digital temperature chip DS1620, and its 1,2,3 pin connect 29,30,31 pin of single-chip microcomputer; The switch acquisition circuit adopts optocoupler TLP521-4 to realize, TLP521-4 includes four road photoelectricity coupled circuits, gather low pressure alarming, alarm for high voltage, locking 1 and 2 four groups of switching values of locking respectively, its optocoupler pin 1,2 links to each other with switch, 16,14,12, the 10 pin output of optocoupler TLP521-4,6,7,8,9 pin of access single-chip microcomputer; The output termination liquid crystal indicator LCD of single-chip microcomputer, it is to be the Liquid Crystal Module of core with the T6963C controller, 51,50,49,48,47,46,45, the 44 pin output of single-chip microcomputer, 10,11,12,13,14,15,16,17 pin of access T6963C; Adopting integrated circuit 24LC512 is data storage circuitry, and these circuit 5,6 pin insert 42,41 pin of above-mentioned single-chip microcomputer; Motor-drive circuit is the pulse input end that the PWM pin of monolithic counter 0 inserts driver, and 37 pin with single-chip microcomputer link to each other with the direction control end of driver simultaneously, and single-chip microcomputer connects mini-printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202195606U CN201327463Y (en) | 2008-11-15 | 2008-11-15 | Comprehensive parameter tester for SF 6 density electrical relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202195606U CN201327463Y (en) | 2008-11-15 | 2008-11-15 | Comprehensive parameter tester for SF 6 density electrical relay |
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| CN201327463Y true CN201327463Y (en) | 2009-10-14 |
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| CNU2008202195606U Expired - Fee Related CN201327463Y (en) | 2008-11-15 | 2008-11-15 | Comprehensive parameter tester for SF 6 density electrical relay |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937060A (en) * | 2010-09-09 | 2011-01-05 | 辽宁省电力有限公司抚顺供电公司 | Checking system and checking method for sulfur hexafluoride density relay |
| CN102156229A (en) * | 2011-03-03 | 2011-08-17 | 哈姆林电子(苏州)有限公司 | Final product tester |
| CN102768166A (en) * | 2012-07-30 | 2012-11-07 | 常兴 | Micro water density measuring device |
| CN109342938A (en) * | 2018-11-29 | 2019-02-15 | 国网四川省电力公司检修公司 | A kind of SF6 density monitor calibration equipment based on secondary singal |
| CN110426314A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | On-line sampling check-up gas density electrical relay with defencive function |
| CN110441679A (en) * | 2019-09-04 | 2019-11-12 | 上海乐研电气有限公司 | Realize the non-maintaining electrical equipment of density monitor, method and system |
| CN110514996A (en) * | 2019-09-04 | 2019-11-29 | 上海乐研电气有限公司 | A kind of remodeling method of gas density relay |
| CN110568350A (en) * | 2019-09-04 | 2019-12-13 | 上海卓电电气有限公司 | Maintenance-free intelligent gas density monitoring device, method and system |
| CN112504355A (en) * | 2020-08-25 | 2021-03-16 | 中铁七局集团电务工程有限公司 | Inflation flow monitoring system for pneumatic tension compensator |
| CN116990468A (en) * | 2023-09-28 | 2023-11-03 | 国网江苏省电力有限公司电力科学研究院 | System and method for testing and evaluating gas state of simulated sulfur hexafluoride electrical equipment |
-
2008
- 2008-11-15 CN CNU2008202195606U patent/CN201327463Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937060A (en) * | 2010-09-09 | 2011-01-05 | 辽宁省电力有限公司抚顺供电公司 | Checking system and checking method for sulfur hexafluoride density relay |
| CN102156229A (en) * | 2011-03-03 | 2011-08-17 | 哈姆林电子(苏州)有限公司 | Final product tester |
| CN102768166A (en) * | 2012-07-30 | 2012-11-07 | 常兴 | Micro water density measuring device |
| CN103954530A (en) * | 2012-07-30 | 2014-07-30 | 常兴 | Device for measuring moisture and density of SF6 gas in SF6 electrical equipment |
| CN109342938A (en) * | 2018-11-29 | 2019-02-15 | 国网四川省电力公司检修公司 | A kind of SF6 density monitor calibration equipment based on secondary singal |
| CN109342938B (en) * | 2018-11-29 | 2024-03-15 | 国网四川省电力公司检修公司 | SF6 density relay calibration device based on secondary signal |
| CN110441679A (en) * | 2019-09-04 | 2019-11-12 | 上海乐研电气有限公司 | Realize the non-maintaining electrical equipment of density monitor, method and system |
| CN110514996A (en) * | 2019-09-04 | 2019-11-29 | 上海乐研电气有限公司 | A kind of remodeling method of gas density relay |
| CN110568350A (en) * | 2019-09-04 | 2019-12-13 | 上海卓电电气有限公司 | Maintenance-free intelligent gas density monitoring device, method and system |
| CN110426314A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | On-line sampling check-up gas density electrical relay with defencive function |
| CN112504355A (en) * | 2020-08-25 | 2021-03-16 | 中铁七局集团电务工程有限公司 | Inflation flow monitoring system for pneumatic tension compensator |
| CN116990468A (en) * | 2023-09-28 | 2023-11-03 | 国网江苏省电力有限公司电力科学研究院 | System and method for testing and evaluating gas state of simulated sulfur hexafluoride electrical equipment |
| CN116990468B (en) * | 2023-09-28 | 2023-12-05 | 国网江苏省电力有限公司电力科学研究院 | System and method for testing and evaluating gas state of simulated sulfur hexafluoride electrical equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20101115 |