CN104317319A - Integrated SF6 gas density controller - Google Patents
Integrated SF6 gas density controller Download PDFInfo
- Publication number
- CN104317319A CN104317319A CN201410546636.6A CN201410546636A CN104317319A CN 104317319 A CN104317319 A CN 104317319A CN 201410546636 A CN201410546636 A CN 201410546636A CN 104317319 A CN104317319 A CN 104317319A
- Authority
- CN
- China
- Prior art keywords
- temperature
- pressure
- circuit
- compensation
- microprocessor
- 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
Abstract
The invention relates to an integrated SF6 gas density controller which is mainly composed of a unit, a machine core, an instrument dial and casing, a spring tube, a compensating component, a pressure-leading component, a pressure sensor, a temperature sensor, an amplification and compensation circuit, a V/I conversion circuit, a microprocessor (single chip microcomputer) and an E2PROM (programmable read-only memory). The unit, the pressure sensor and the temperature sensor are connected in series. The unit is connected with a temperature compensating circuit and a dial indicator in sequence. After operational amplifying and conversion through an A/D (analog/digital) conversion circuit, the pressure sensor is connected into the microprocessor, and the temperature sensor is connected into the microprocessor. The microprocessor outputs 4-20mA current signals through a D/A conversion circuit and the V/I conversion circuit. The microprocessor obtains compensation values of output signals at a certain temperature by aid of pressure-temperature comprehensive compensation in the E2PROM according to pressure and temperature signals, the amplification and compensation circuit is input, and an RS485 interface circuit directly outputs pressure and temperature before and after compensation.
Description
Technical field
The invention belongs to intelligent instrumentation manufacturing technology field, is electromechanical integration type product.Product mainly have employed sensor technology, singlechip technology, specified temp compensation technique, makes this product become a novel functions, perfect compound product.This product is except can also exportable three kinds of signals except on-the-spot instruction: switch controlling signal, two-wire system 4 ~ 20mA standard current signal and RS485 digital quantity signal.Product is mainly used in SF in intelligent substation
6the scene of high-voltage electrical equipment (as isolating switch, mutual inductor, combined electrical apparatus etc.) running state parameter indicates, controls and remote online monitoring.
Background technology
SF
6gas is now widely used in the high-voltage electrical equipment (as isolating switch, mutual inductor, combined electrical apparatus etc.) that in electrical network, high voltage grade transformer substation runs as insulation arc-extinguishing medium.In high-tension apparatus operational process, if due to SF
6leakage Gas causes SF
6gas density reduces, thus makes score, closing operation produce electric arc, and this will have a strong impact on the security of operation of this equipment.Therefore monitoring is carried out to the gas density in operational outfit extremely important.
SF in current high-voltage electrical equipment air chamber
6gas density mainly relies on density monitor to monitor.It indicates the pressure under 20 DEG C of environment temperatures by scale.According to diverse location trigger alarm, the block signal of pointer.
The principle of work of density monitor is: the SF that bourdon tube will sense
6gaseous tension is converted to pipe end displacement of the lines, sensed pressure more bassoon end line displacement is larger, and this displacement will pass to gear drive by heat-sensitive duplex metal temperature compensating element, and gear drive is by displacement equations and convert angular displacement to, drive pointer rotates, thus completes pressure instruction.Heat-sensitive duplex metal temperature compensating element is as critical elements, can produce with variation of ambient temperature and expand with heat and contract with cold, just in time eliminate the equipment air chamber pressure that environment temperature causes when transfer tube end movement and change the displacement produced at instrument bourdon tube pipe end, thus reach temperature compensation function, the warning that the force value that instrument is indicated and contact export, pressure when locking force value is always in equipment air chamber 20 DEG C.
Although mechanical type density monitor can by gas density in pointer mode indicating equipment air chamber (namely 20 DEG C time gaseous tension), and when working as gases did escape and cause density to decline, also can send warning and latch switch amount signal, but these functions only can meet at the scene to the needs that equipment running status and parameter are monitored, not there is the signal is far passed and carry out communicating etc. function with computer monitoring system, the limitation place of this this product just.
And for SF
6gas density transmitter, it has the signal is far passed and carries out communicating etc. function with computer monitoring system, and without scene instruction monitoring function, the maintenance work for some scenes brings trouble, and staff intuitively cannot understand the state of current device.
At present, the intelligent grid engine request that country has come into effect carries out remote online to the running status of substation equipment and parameter and monitors in real time, and this just requires Density Measuring Instrument table to have the signal is far passed and carries out communicating etc. function with computer monitoring system; Meanwhile, the maintenance work of conveniently field personnel.The density instrument that can be used for on-the-spot instruction is also absolutely necessary.Integrated product can eliminate the drawback of above two kinds of products simultaneously, and is that client provides good economic benefit in cost control, I&M etc.
Summary of the invention
The present invention seeks to design a kind of integral type SF
6gas density controller, to reduce costs, is convenient to safeguard.
Integral type SF
6gas density controller, it is primarily of unit, movement, meter dial and shell, bourdon tube, compensating element, impulse element, pressure transducer, temperature sensor, enlarged circuit and compensation circuit, V/I change-over circuit, microprocessor, E
2pROM forms, unit in parallel, pressure transducer and temperature sensor, and unit indicates with temperature-compensation circuit, scale successively and is connected; Pressure transducer is by accessing microprocessor after operation amplifier and A/D change-over circuit, and temperature sensor accesses microprocessor; Microprocessor exports 4-20mA current signal by D/A and V/I change-over circuit; Microprocessor utilizes E according to pressure, temperature signal
2the offset that pressure in PROM-temperature integrated compensation outputs signal under obtaining this temperature, input enlarged circuit and compensation circuit, and directly export the rear pressure of compensation by RS485 interface circuit, compensate front pressure and temperature.
The mechanical part of unit, movement, bourdon tube, scale, compensating element, assembly controller also carries out adjustment, and impulse element is that pressure is caused pressure transducer end by argon arc welding solder technology from unit lower end by U-shaped structure; Pressure survey adopts the oil-filled isolation core body of small-sized silicon piezoresistive pressure sensor, this core body is placed in the sensor shell of having welded, adopt the sealing of end face, side twice O-ring seals, gland nut is coordinated to be fixed in sensor shell by core body, temperature survey adopts temperature sensor to be placed in the cavity of temperature sensor shell, circuit board is screwed on its bearing, and be connected with pressure transducer, temperature sensor, connector with flexible circuit conductor, connector is fixed on sensor outer housing by screw.
The change of responsible data processing, on the basis of density monitor, by the bamboo product of structure, is sent printed board to be fixed on thereafter, is made it to become integrated product by the present invention.This product has still continued to use silicon piezoresistive pressure sensor and temperature sensor, is respectively used to measure SF
6the pressure and temperature parameter of gas, and convert thereof into corresponding electric signal, after processing of circuit, be sent to single-chip microcomputer do further process.For the design of pressure source, specialized designs a set of two ends all-welded impulse elements, also ensure that the homogeneity of pressure source, in addition to the optimization of temperature compensation while ensureing to meet high leak rate requirement, stem-winder registration and the change number of delivering letters are exported more reach unanimity, reduce unnecessary error.
Accompanying drawing explanation
Fig. 1 is integral type SF of the present invention
6gas density controller theory diagram,
Fig. 2 is integral type SF of the present invention
6gas density controller temperature characteristics and compensation characteristic curve synoptic diagram,
Fig. 3-6 is structural representation of the present invention.
Figure number illustrates: 1-unit, 2-washer screw, 3-packing ring, 4-contact group, 5-screw, 6-case, 7-tempered glass, 8-indicating hand component, 9-scale, 10-tempered glass O-ring seal, 11-bracing ring, 12-density controller gib screw, 13-seals controller O-ring seal, 14-terminal box, 15-label, 16-plug, 17-sender unit cap, 18-sender unit cap O-ring seal, 19-silicon piezoresistive pressure oil filling core body, 20-circuit board cover, 21-circuit board, 22-nut, 23-density controller, 24-joint.
Embodiment
As shown in figures 1 to 6, integral type SF
6gas density controller is primarily of unit, movement, meter dial and shell, bourdon tube, compensating element, impulse element, pressure transducer, temperature sensor, enlarged circuit and compensation circuit, V/I change-over circuit, microprocessor (single-chip microcomputer), E
2the compositions such as PROM (including temperature compensation program).The mechanical part of the composition control devices such as unit, movement, meter dial, shell, bourdon tube, compensating element, exports for registration instruction and control signal; Pressure transducer and temperature sensor are respectively used to detect SF
6the pressure and temperature of gas in high-voltage electrical equipment, and convert thereof into corresponding electric signal and be sent to single-chip microcomputer, single-chip microcomputer utilizes E according to pressure, temperature signal
2the offset that pressure in PROM-temperature integrated compensation software outputs signal under obtaining this temperature, enlarged circuit and compensation circuit carries out corresponding temperature compensation to the output signal of pressure transducer after receiving the compensating instruction of single-chip microcomputer and offset data, and by the result after compensating by RS485 interface circuit directly export compensate after pressure, compensate before pressure and temperature.Result after compensation also becomes the standard current signal of the 4 ~ 20mA corresponding with gas pressure value under 20 DEG C of conditions by D/A, V/I circuit conversion.Signals collecting is carried out real-time communication with computer remote monitoring system by collector by user.Data/control center monitors running status and the parameter of on-the-spot individual device at any time by network and fieldbus, understands equipment SF
6the leakage situation of gas, so that the maintenance cycle of reasonable arrangement equipment, thus makes transformer station's unmanned become a reality.
The core of this design project is the correction algorithm design of the new component designs that combines of electromechanical and Chip Microprocessor Temperature compensation software.
On the one hand, because pressure transducer needs to respond to homology pressure with mechanical part, and user is generally for SF
6the leak rate of gas requires (1 × 10
-9pam
3/ s) higher, therefore to ensure, on the basis that leak rate requires, ensure the normal boot of pressure and be unlikely to decline of pressure, corresponding impulse element and the relevant processing technology of establishment need designed.
On the other hand, due to SF
6gas belongs to non-ideal gas, and therefore its pressure-temperature characterisitic does not meet the Ideal-Gas Equation.Other SF in the market
6the algorithm design of gas density controller temperature compensation software is according to mostly adopting Beattie-Bridgman formula
P＝56.2(1+B)γT-Aγ
2
Wherein A=74.9 (1-0.727 × 10
-3γ)
B＝2.51×10
-3γ(1-0.846×10
-3γ)
Because this is an approximate formula, in formula gaseous tension and temperature linear, but in fact SF
6pressure-temperature characterisitic the various degrees of gas non-linear, during algorithm design foundation therefore using this formula as temperature compensation software, temperature compensation precision can produce certain deviation, in addition, temperature compensation also cannot comprise the temperature error of pressure transducer itself.Therefore the present invention when the algorithm design of Chip Microprocessor Temperature comprehensive compensation software by SF
6gaseous tension-temperature characterisitic and sensor temperature error synthesis are considered, by Special testing device simulated field working environment, condition, test the pressure-temperature characterisitic of every controller, and be stored in the pressure of each controller when reference temperature 20 DEG C, low temperature-20 DEG C and high temperature 60 DEG C, temperature parameter as temperature compensation foundation in respective single-chip data unit, thus reach the full compensation effect of controller at low temperature-20 DEG C and high temperature 60 DEG C of two temperature spots.When controller is operated in the low-temperature space lower than reference temperature 20 DEG C, controller output pressure signal compensation amount calculates with following formula in the algorithm
Compensation rate △ P and figure middle conductor ED ', integrated temperature additive error and figure middle conductor ED, the two is very close, illustrates thus, its compensation characteristic curve of this compensation scheme extremely approaches actual temperature family curve, and temperature compensation algorithm has higher temperature compensation precision.
In like manner, when controller is operated in the high-temperature region higher than reference temperature 20 DEG C, controller output pressure signal compensation amount calculates with following formula in the algorithm
Feature of the present invention:
1) impulse element two ends adopt argon arc welding welding, can meet high leak rate requirement, and reasonable in design,
Not easily cause pipe blocking and the decline of pressure caused;
2) devise complete brand-new technique, ensure that the properties of controller.
3) temperature compensation program has considered SF in closed container when algorithm design
6the pressure of gas---temperature characterisitic and pressure sensor temperature characteristic, the complete simulated field working environment of temperature compensated reference data carries out test and obtains, and makes controller have higher temperature compensation precision; 4) pressure transducer adopts small-sized welding silicon piezoresistive pressure sensor, and sealing property is reliable, and signal stabilization performance is good;
5) installation site of temperature sensor and the design of special heat isolating structure can experience tested SF more truly
6the temperature of gas, decreases internal circuit temperature rise impact;
6) output signal antijamming capability strong, transmission range is long;
7) compact conformation, easy to install.
Conventionally use the mechanical part of the assembly controllers such as unit, movement, bourdon tube, scale, compensating element, and carry out adjustment.
Impulse element is U-shaped structure, avoids the stop of various parts dexterously, from unit lower end, pressure is caused pressure transducer end by argon arc welding solder technology.
Pressure survey adopts the oil-filled isolation core body of small-sized silicon piezoresistive pressure sensor, this core body is placed in the sensor shell of having welded, adopt the sealing of end face, side twice O-ring seals, coordinate gland nut to be fixed in sensor shell by core body, not only ensure that safety but also sealing is promoted further.Through test of many times, sealing property is reliable and stable.
Temperature survey adopts temperature sensor, according to general way, this sensor directly can be installed on circuit board, but due to the work of circuit will certainly release heat, thus make deviation appears in temperature sensor measurement.For above problem, temperature sensor is placed in the cavity of temperature sensor shell by we, makes it away from circuit board, and gives packing with the good silicon rubber of effect of heat insulation.
Circuit board is screwed on its bearing, is connected with pressure transducer, temperature sensor, connector with flexible circuit conductor.Connector is fixed on sensor outer housing by screw, adopts special wrench set mounting circuit boards lid.
With computing machine by program and calibration data write single-chip microcomputer, then carry out pressure zero, pressure rated point, pressure full scale linear calibration.Be contained in after linear calibration completes and there is good sealing property, and inside is filled with SF
6on the container of gas, entirety is inserted high-low temperature test chamber and is carried out reference temperature (20 DEG C) test, treats the SF in container
6after gas and controller equalized temperature, by the SF in container
6after gaseous tension is released into controller rated pressure (i.e. filling apparatus atmospheric pressure), by computer temperature compensation calibration software, reference temperature calibration is carried out to controller, by the pressure under reference temperature condition and temperature parameter stored in EEPROM, then heating and cooling, to low temperature-20 DEG C and high temperature+60 DEG C, treat the SF in container respectively
6after gas and controller equalized temperature, by computer temperature compensation calibration software, low temperature and high-temperature temperature calibration are carried out to controller, by the pressure under low temperature-20 DEG C and high temperature 60 DEG C of temperature conditions and temperature parameter stored in EEPROM, this process is temperature compensation calibration process.When environment temperature changes, single-chip microcomputer is according to E
2the data collected when the temperature compensation parameter in PROM and temperature compensation rating test, calculation process is carried out to the pressure received, temperature signal, complete the temperature compensation to pressure signal, by circuit export with gas density in equipment air chamber (namely 20 DEG C time force value represent) corresponding two-wire system 4 ~ 20mA standard current signal, or by RS485 interface export gas pressure value after temperature compensation (namely 20 DEG C time force value, corresponding with gas density), compensate front pressure (i.e. equipment air chamber actual pressure) and gas temperature.
Claims (3)
1. integral type SF
6gas density controller, is characterized in that primarily of unit, movement, meter dial and shell, bourdon tube, compensating element, impulse element, pressure transducer, temperature sensor, enlarged circuit and compensation circuit, V/I change-over circuit, microprocessor, E
2pROM forms, unit in parallel, pressure transducer and temperature sensor, and unit indicates with temperature-compensation circuit, scale successively and is connected; Pressure transducer is by accessing microprocessor after operation amplifier and A/D change-over circuit, and temperature sensor accesses microprocessor; Microprocessor exports 4-20mA current signal by D/A and V/I change-over circuit; Microprocessor utilizes E according to pressure, temperature signal
2the offset that pressure in PROM-temperature integrated compensation outputs signal under obtaining this temperature, input enlarged circuit and compensation circuit, and directly export the rear pressure of compensation by RS485 interface circuit, compensate front pressure and temperature.
2. integral type SF according to claim 1
6gas density controller, is characterized in that the mechanical part of unit, movement, bourdon tube, scale, compensating element, assembly controller and carries out adjustment, and impulse element is that pressure is caused pressure transducer end by argon arc welding solder technology from unit lower end by U-shaped structure; Pressure survey adopts the oil-filled isolation core body of small-sized silicon piezoresistive pressure sensor, this core body is placed in the sensor shell of having welded, adopt the sealing of end face, side twice O-ring seals, gland nut is coordinated to be fixed in sensor shell by core body, temperature survey adopts temperature sensor to be placed in the cavity of temperature sensor shell, circuit board is screwed on its bearing, and be connected with pressure transducer, temperature sensor, connector with flexible circuit conductor, connector is fixed on sensor outer housing by screw.
3. integral type SF according to claim 2
6gas density controller, is characterized in that for measuring SF
6the pressure transducer pressure-sensitive cavity of gaseous tension adopts multiple-sealed measure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410546636.6A CN104317319A (en) | 2014-10-15 | 2014-10-15 | Integrated SF6 gas density controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410546636.6A CN104317319A (en) | 2014-10-15 | 2014-10-15 | Integrated SF6 gas density controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104317319A true CN104317319A (en) | 2015-01-28 |
Family
ID=52372561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410546636.6A Pending CN104317319A (en) | 2014-10-15 | 2014-10-15 | Integrated SF6 gas density controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104317319A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105183021A (en) * | 2015-09-18 | 2015-12-23 | 四川菲博斯科技有限责任公司 | Sulfur hexafluoride gas leakage monitoring system |
| CN110567840A (en) * | 2019-09-04 | 2019-12-13 | 上海乐研电气有限公司 | Overvoltage-resistant gas density transmitter and monitoring system |
-
2014
- 2014-10-15 CN CN201410546636.6A patent/CN104317319A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105183021A (en) * | 2015-09-18 | 2015-12-23 | 四川菲博斯科技有限责任公司 | Sulfur hexafluoride gas leakage monitoring system |
| CN105183021B (en) * | 2015-09-18 | 2018-03-06 | 四川菲博斯科技有限责任公司 | Sulfur hexafluoride gas leakage monitoring system |
| CN110567840A (en) * | 2019-09-04 | 2019-12-13 | 上海乐研电气有限公司 | Overvoltage-resistant gas density transmitter and monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104616931B (en) | A kind of low temperature resistant digital SF6 relay | |
| CN207301823U (en) | A kind of mixed gas density controller | |
| CN205919907U (en) | A equipment for sensing process variable | |
| WO2021218291A1 (en) | Gas density relay with online self-checking function and checking method therefor | |
| WO2021218288A1 (en) | Online checking apparatus for gas density relay and online checking method thereof | |
| CN105609368B (en) | A kind of gas density relay with gas density level indicator | |
| CN211426165U (en) | Gas density relay with online self-checking function and monitoring device | |
| WO2021218284A1 (en) | Gas density relay having simulation check function and simulation check method thereof | |
| CN110487670A (en) | A kind of gas density relay and its method of calibration with online self checking function | |
| WO2021218286A1 (en) | Gas density relay with online self-checking function, and checking method therefor | |
| CN110501260A (en) | A kind of gas density relay and its method of calibration with online self checking function | |
| CN103454004B (en) | A kind of digital multi-drop temp measuring system and implementation method | |
| CN211718032U (en) | Gas density relay with online self-checking function and monitoring device | |
| CN202305360U (en) | Intelligent sulfur hexafluoride gas density transmitter | |
| CN104317319A (en) | Integrated SF6 gas density controller | |
| CN201653851U (en) | SF6 gas density transmitter and on-line monitoring system applying same | |
| CN204314743U (en) | Integral type SF6 gas density controller | |
| CN110412226A (en) | A kind of high-precision gas density monitor and system based on edge calculations | |
| WO2021043039A1 (en) | Transformation method for gas density relay, and gas density relay having online self-check function and check method thereof | |
| CN110534377A (en) | A kind of non-maintaining gas density relay | |
| CN110514996A (en) | A kind of remodeling method of gas density relay | |
| CN110411894A (en) | A kind of gas density monitoring system | |
| CN110618060A (en) | Electromechanical integral digital display gas density relay | |
| CN110426315A (en) | A kind of gas density relay and system of electromechanical integration | |
| CN110514995A (en) | A kind of gas density relay and its method of calibration with online self checking function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150128 |