CN211179414U - Economical gas density monitoring device and system - Google Patents
Economical gas density monitoring device and system Download PDFInfo
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- CN211179414U CN211179414U CN201921457360.9U CN201921457360U CN211179414U CN 211179414 U CN211179414 U CN 211179414U CN 201921457360 U CN201921457360 U CN 201921457360U CN 211179414 U CN211179414 U CN 211179414U
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Abstract
The application discloses an economical gas density monitoring device and system, which comprise a mechanical part and an electronic part; the mechanical part comprises a base, a pressure detector, a temperature compensation element, a signal generator and a device connecting joint; the electronic part comprises a pressure sensor, a temperature sensor, an intelligent control unit and an electronic signal contact, and the electronic signal contact is connected with the signal generator in series and/or in parallel, or the electronic signal contact is connected with a control loop corresponding to the signal generator in series or in parallel; the intelligent control unit is respectively connected with the pressure sensor and the temperature sensor, acquires a pressure value and a temperature value, and processes the pressure value and the temperature value to obtain a gas density value; the intelligent control unit outputs an electronic signal contact, and when the monitored gas density value is lower than or higher than the set density value, the intelligent control unit outputs an electronic signal contact through which a corresponding contact signal is output. This application is with low costs, can accurate monitoring electrical equipment's gas density value, in time discovers gas leakage, ensures the safe operation of electric wire netting.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to use on high pressure or middling pressure electrical equipment, economical gas density monitoring devices and system.
Background
At present, SF6(sulfur hexafluoride) electrical equipment is widely applied to the power sector and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and SF (sulfur hexafluoride) is6Electrical equipment is used more and more. SF6The gas has functions of arc extinction and insulation in high-voltage electrical equipment, and SF in the high-voltage electrical equipment6The density reduction of the gas will seriously affect the SF6Safe operation of high-voltage electrical equipment: SF6The reduction of the gas density to a certain extent will lead to a reduction or loss of the insulation and arc extinguishing properties.
Detection of SF6The equipment adopted when the electric product leaks gas is generally a gas density relay, and when the gas pressure is reduced to an alarm value, an alarm signal is sent out. At present, the gas density relay is mechanical, such as the gas density relay disclosed in the patent CN108231475B, etc. of the applicant, which includes a base, a pressure detector, a temperature compensation element, a signal generator and a device connection joint, the mechanical gas density relay has poor precision and cannot act when the pressure changes slightly, therefore, when an alarm signal is sent, SF when the alarm signal is sent, the mechanical gas density relay does not work, and the SF is used for detecting the pressure change of the device, so that the device is used for generating6Much of the gas has leaked. For example SF with a nominal pressure of 0.7MPa6The electrical equipment generally adopts a gas density relay with alarm pressure of 0.62Mpa and locking pressure of 0.60 Mpa. When the gas leaks, the pressure is reduced to 0.7MPa and 0.62When the pressure is between MPa, the mechanical gas density relay can not act, namely, the gas leakage alarm can not be sent out.
Many substations are now unattended substations, and for such SF6For the electrical equipment, if gas leakage occurs, only when the gas is reduced from the rated pressure of 0.7Mpa to the alarm pressure of 0.62Mpa, the operator on duty can find the gas leakage and inform the maintainer to deal with the leakage accident on site, and the SF at the moment6Much gas is leaked, which is not beneficial to environmental protection and economic benefit. The existing mechanical density relay generally has the problem of inaccurate measurement, and is difficult to meet the requirements of accurate measurement and accurate management and control. In order to protect the environment more, reduce cost simultaneously, carry out the fine management, need urgently to develop a low cost, economical and practical, can realize accurate measuring gas density monitoring devices.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an economical gas density monitoring devices and system to solve the problem that provides in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect of the present application, an economical gas density monitoring apparatus is provided.
In a second aspect of the present application there is provided an economic gas density monitoring system consisting of or comprising an economic gas density monitoring apparatus as described in the first aspect.
An economical gas density monitoring device, include: a mechanical part and an electronic part;
the mechanical part comprises a base, a pressure detector, a temperature compensation element, at least one signal generator and an equipment connecting joint, and the mechanical part outputs a joint signal through the signal generator;
the electronic part comprises a pressure sensor, a temperature sensor, an intelligent control unit and an electronic signal contact, and the electronic signal contact is connected with the signal generator in series and/or in parallel, or the electronic signal contact is connected with a control loop corresponding to the signal generator in series or in parallel; the intelligent control unit is respectively connected with the pressure sensor and the temperature sensor and is used for acquiring a pressure value acquired by the pressure sensor and a temperature value acquired by the temperature sensor and processing the pressure value and the temperature value to obtain a corresponding gas density value; the intelligent control unit controls the electronic signal contact, and when the gas density value monitored by the electronic part is lower than or higher than a set density value, the intelligent control unit controls the electronic signal contact to act and output a corresponding contact signal;
wherein, the mechanical part and the electronic part are designed separately or integrally.
Preferably, the gas density value is converted to a pressure value of 20 ℃.
Preferably, the pressure sensor is in communication with a pressure detector over the air path.
Preferably, the signal generator includes at least one mechanical signal contact, the mechanical signal contact is a first normally-open switch, the electronic signal contact includes at least one second normally-open switch, and the second normally-open switch is connected in parallel with the first normally-open switch, or the second normally-open switch is connected in parallel with a control loop corresponding to the first normally-open switch; or,
the mechanical signal contact is a first normally-closed switch, the electronic signal contact comprises at least one second normally-closed switch, and the second normally-closed switch is connected with the first normally-closed switch in series or the second normally-closed switch is connected with a control loop corresponding to the first normally-closed switch in series.
Preferably, the contact signal output by the electronic part and the contact signal output by the mechanical part both comprise an alarm and/or a lock.
Preferably, the mechanical part is a density relay or a density switch; the electronic part is a density transmitter or a density sensor.
Preferably, the electronic signal contact comprises one or more of an electromagnetic relay, a solid state relay, a time relay, a power relay, a thyristor, an electronic switch, an electric contact, an optical coupler, DI, a MOS field effect transistor, a triode, a diode and a MOS FET relay.
Preferably, the signal generator comprises a microswitch or a magnetically assisted electrical contact; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element is a compensation element formed by a bimetallic strip or a compensation element filled with compensation gas.
Preferably, the device connection terminal is provided on the mechanical part or on the electronic part, and the monitoring device is in communication with the electrical device via the device connection terminal.
Preferably, when the pressure value monitored by the electronic part is lower than or higher than the set pressure value, the electronic part outputs a contact signal; and/or the presence of a gas in the gas,
when the temperature value monitored by the electronic part is lower than or higher than the set temperature value, the electronic part outputs a contact signal.
Preferably, the monitoring device further comprises a multi-way joint, and the mechanical part and the electronic part are arranged on the multi-way joint.
Preferably, the intelligent control unit calculates the gas density value of the electrical device by using an averaging method (mean method), where the averaging method is as follows: setting the collection frequency in a set time interval, and carrying out average calculation processing on all the collected N gas density values at different time points to obtain a gas density value P20Average value P of20 average(ii) a Or setting temperature interval step length in a set time interval, and carrying out average value calculation processing on density values of N different temperature values acquired in all temperature ranges to obtain a gas density value P20Average value P of20 average(ii) a Or setting pressure interval step length in a set time interval, and carrying out average value calculation processing on density values of N different pressure values acquired in all pressure variation ranges to obtain a gas density value P20Average value P of20 average(ii) a Wherein N is a positive integer greater than or equal to 1.
More preferably, in the averaging method, the obviously abnormal gas density value is deleted first, and specifically, the gas density value outside the set reasonable interval range can be deleted by setting the reasonable interval range; or deleting at least one maximum value, and/or deleting at least one minimum value.
More preferably, the intelligent control unit calculates that the gas density value of the electrical equipment is lower than or higher than the set density value P by using an averaging method20 setThen, the electronic part outputs a contact signal; wherein the set density value P20 setThe density value is set according to the requirement, or the density value is detected in a set time period in the past.
Further, the set density value P20 setCan be modified and stored online.
Preferably, the intelligent control unit further calculates a gas density value P20Trend change value △ P of20When the trend change value is △ P20Lower or higher than the set trend change value △ P20 setThe electronic part outputs a contact signal, wherein the trend change value △ P20Comprises the following steps:
setting collection frequency in a set time interval, and calculating the average value of N gas density values of different time points obtained by all the collections to obtain the gas density value P20Average value P of20 averageThen, a trend calculation period T is setPeriod of timeObtaining a trend change value △ P20＝P20 average (previous T period value)-P20 average (T period)I.e. the mean value P20 averageFront-back period TPeriod of timeA difference of (d); or,
at a set time interval TSpacerGas density value P of the monitored electrical apparatus20Trend change value △ P of20＝P20 (previous T interval)-P20(T interval)I.e. density value P20Front-to-back time interval TSpacerA difference of (d); or,
setting a time interval TSpacerSetting the time length TLength ofWhen adopted at the time of settingInterval TSpacerSetting the collection frequency, and collecting all the N gas density values P obtained at different time points20Performing accumulation calculation to obtain an accumulated value ∑P20Obtaining a trend change value △ P20＝∑P20 (previous T length)-∑P20 (when T length)I.e. the time length T before and afterLength ofAccumulated value ∑P20The difference between them;
wherein N is a positive integer greater than or equal to 1.
More preferably, when the gas density value P is20Is smaller, and the smaller trend change value is greater than or equal to the set trend change value △ P20 setAnd the intelligent control unit uploads abnormal information through an alarm contact signal line of the monitoring device, or uploads an abnormal signal through the communication module.
Preferably, the intelligent control unit is used for controlling the gas density value P at certain intervals20Fourier transform is carried out, the frequency spectrum is converted into a corresponding frequency spectrum, and periodic components are filtered; or,
the gas leakage is judged according to the trend component.
Preferably, the monitoring device is able to input a gassing event and/or a gassing test event and to compare the gas density value P with a corresponding gassing event and/or gassing test event20A new calculation or adjustment is made.
More preferably, the monitoring device monitors the gas density value P within a certain short time20Gradually increasing, judging as gas supplementing event, and when gas density value P20When the maximum value is reached, judging that the gas supplementing event is ended, and comparing the gas density value P20A new calculation or adjustment is made.
More preferably, the monitoring device monitors the gas density value P within a certain short time20Gradually decreases, and is judged as a gas release test (micro-water or decomposition) event, when the gas density value P is20When the value is the minimum value, judging that the air discharge test event is ended, and comparing the gas density value P20To carry outNew calculations or adjustments.
More preferably, the monitoring device records an air-filling event, and/or an air-bleeding test event. Such as recording the time of gas supply, and/or the number of times of gas supply, and/or the gas quality.
Preferably, the monitoring device further comprises a micro-water sensor for monitoring the micro-water value of the gas, and the electronic part outputs a contact signal when the micro-water value of the gas exceeds a set value.
Preferably, the monitoring device further comprises a decomposition product sensor for online monitoring of the gas decomposition product, and the electronic part outputs a contact signal when the content of the gas decomposition product exceeds a set value.
Preferably, the monitoring device uploads the monitored data and information thereof in a regular encoded form through electronic signal contacts, which are connected in parallel or in series to a signal generator or a dedicated line, or other lines. Specifically, the monitored data and information thereof include: the monitored gas density value, pressure value, temperature value, state information of the signal generator, abnormal information (self abnormal phenomena such as gas density value of electrical equipment, gas leakage phenomenon, pressure overhigh, temperature overhigh, pressure sensor of a monitoring device, temperature sensor and the like), and self-diagnosis results.
Preferably, the monitoring device uploads monitored data and information thereof through an alarm signal line, a locking signal line or a special signal line in a P L C power carrier mode.
Preferably, the intelligent control unit further comprises a mechanical contact signal state monitoring circuit for monitoring the state (active and inactive) of the signal generator of the mechanical part.
Preferably, the intelligent control unit automatically controls the state (action and non-action) monitoring and signal remote transmission processes of the electronic signal contacts and the signal generator based on embedded algorithm and control program of the embedded system of the microprocessor, and comprises all peripherals, logic and input and output.
Preferably, the intelligent control unit automatically controls the whole process based on embedded algorithms and control programs such as a general computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a P L C and the like, an industrial control mainboard, an embedded main control board and the like, and comprises all peripherals, logics, input and output.
More preferably, the core element of the intelligent control unit is a processor formed by an integrated circuit, or a programmable controller, or an industrial personal computer, or an industrial computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.
More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.
Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the state monitoring result in a long distance.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a P L C power carrier and a cable.
Further, the wireless communication mode comprises one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar which are arranged in the sensor.
More preferably, the value of gas density P monitored when the electronic part is active20Less than or equal to the set density value P20 setAnd the intelligent control unit uploads the abnormal signal through an alarm contact signal line of the monitoring device, or uploads the abnormal signal through the communication module.
Preferably, the control of the intelligent control unit is controlled by field control and/or the background monitoring terminal.
Preferably, at least one temperature sensor is arranged in the vicinity of, on or integrated in a temperature compensation element of the mechanical part. Preferably, at least one of the temperature sensors is disposed at an end of the pressure detector of the mechanical part near the temperature compensation element.
Preferably, the monitoring device comprises at least two pressure sensors, and the pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.
Preferably, the monitoring device comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.
Preferably, the monitoring means comprises at least one pressure sensor and at least one temperature sensor; randomly arranging and combining the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors, converting the combinations into a plurality of corresponding pressure values at 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and comparing the gas density values to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are subjected to all permutation and combination, and each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristic, namely gas density values, and each gas density value is compared to complete the mutual verification of each pressure sensor and each temperature sensor.
Preferably, the monitoring device compares the environmental temperature value with a temperature value acquired by the temperature sensor to complete the calibration of the temperature sensor.
Preferably, the monitoring device has a self-diagnosis function and can notify abnormality in time. Such as a wire break, short alarm, sensor damage, etc.
Preferably, the monitoring device further comprises an analysis system (for example, an expert management analysis system) for detecting, analyzing and judging the gas density value monitoring, the mechanical part performance and the electronic part performance.
Preferably, the monitoring device further comprises a delay circuit, and the delay circuit comprises an analog circuit delay, a digital circuit delay, or a mixed delay of an analog circuit and a digital circuit.
Preferably, the monitoring device further comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with a display value display.
Preferably, the monitoring device measures the gas pressure value and the temperature value at the working environment temperature, automatically converts the gas pressure value and the temperature value into a gas density value (a corresponding pressure value at 20 ℃), and processes the monitored gas density value, and/or the monitored pressure value and/or the monitored temperature value, that is, the gas density value, the pressure value and the temperature value of the electrical equipment can be monitored online, so that the online monitoring of the state of the gas density of the electrical equipment is realized.
Preferably, the monitoring device further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current data value in real time and/or supports data input.
More preferably, the monitoring device supports the input of basic information of the monitoring device, wherein the basic information includes, but is not limited to, one or more of factory number, precision requirement, rated parameter, manufacturing plant and operation position.
Preferably, monitoring devices still includes leading valve and rearmounted valve, closes through intelligence accuse unit leading valve, then opens rearmounted valve puts pressure sensor's gas pressure to the zero-bit, the current pressure value of intelligence unit simultaneous acquisition is compared, accomplishes the zero-bit check to pressure sensor, and the intelligent cell judges the comparison result, if the error is out of tolerance, sends unusual suggestion: pressure sensors have problems.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
1) the monitoring device comprises a mechanical part and an electronic part, wherein the mechanical part comprises a pressure detector, a temperature compensation element and a plurality of signal generators, the electronic part comprises a plurality of sensors, an intelligent control unit and an electronic signal contact, and the intelligent control unit processes pressure values and temperature values acquired by the sensors to obtain corresponding gas density values; when the gas density value monitored by the electronic part is lower than or higher than a set value, the electronic signal contact of the electronic part outputs a contact signal, so that the operation and inspection personnel know abnormal information, the economical gas density monitoring device has very accurate measurement, can greatly improve the test precision, can find gas leakage in time, deal with the gas leakage problem in time and reduce SF leaked into the atmosphere6The gas is beneficial to environmental protection, saves cost and simultaneously ensures the safety of the power grid.
2) The electronic part has higher precision and can detect the leakage of trace gas so as to give an alarm in time, but the electronic part is easily subjected to electromagnetic interference, and under the condition, the mechanical part plays a role.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic side view of an economical gas density monitoring apparatus according to a first embodiment;
FIG. 2 is a schematic front view of an economical gas density monitoring apparatus according to the first embodiment;
FIG. 3 is a schematic block diagram of an economical gas density monitoring apparatus according to the first embodiment;
FIG. 4 is a schematic front view of an economical gas density monitoring apparatus according to the second embodiment;
fig. 5 is a schematic configuration diagram of an economical gas density monitoring system of a third example;
fig. 6 is a schematic structural diagram of an economical gas density monitoring system according to a fourth example.
Detailed Description
The utility model provides an economic gas density monitoring devices and system, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following refers to the drawing and lifts the example the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, it being understood that the data so used may be interchanged under appropriate circumstances. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first embodiment is as follows:
fig. 1 and fig. 2 are schematic structural views of a high-performance economical gas density monitoring device for high-voltage electrical equipment according to an embodiment of the present invention. As shown in fig. 1 and 2, an economical gas density monitoring device comprises a mechanical part 1 and an electronic part 2 which is independent from the mechanical part; the mechanical part 1 and the electronic part 2 which is independent from the mechanical part are designed integrally. The machine part 1 comprises a pressure detector 103, a temperature compensation element 104, a number of signal generators 109. The electronic part 2 comprises a plurality of sensors (pressure sensor 201, temperature sensor 3) and an intelligent control unit 202. The intelligent control unit 202 is respectively connected with a plurality of transmittersThe sensors (pressure sensor 201, temperature sensor 3) are connected. Pressure and temperature signals are acquired by a plurality of sensors (a pressure sensor 201 and a temperature sensor 3), and corresponding density values P are obtained through processing of an intelligent control unit 202 according to the gas pressure-temperature characteristics20(i.e.a pressure value P of 20 ℃ C.)20) Further realizing the on-line monitoring of the gas density value P of the electrical equipment20(or density value P)20Pressure value P, temperature value T, or pressure value P, temperature value T). The electronic part 2 comprises an electronic signal contact 2012 for monitoring the gas density value P of the electrical apparatus monitored by said electronic part 220Lower or higher than the set density value P20 setWhen the system is used, the electronic part 2 outputs a contact signal A, so that the operation and inspection personnel can know abnormal information; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Trend change value △ P of20Lower or higher than the set trend change value △ P20 setThen, the monitoring device outputs a contact signal A; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Average value P of20 averageLower or higher than the set density average value P20 averageDuring the setting, the monitoring device outputs a contact signal A.
Referring to fig. 1 and 2, the machine part 1 further includes: a mechanical part shell 101, and a base 102, a movement 105, a pointer 106, a dial 1012, an end seat 108, a signal adjusting mechanism 107 and a device connecting joint 1010 which are arranged in the mechanical part shell, wherein the device connecting joint 1010 is arranged on the mechanical part 1 or the electronic part 2. The electronic part 2 further comprises: the communication module 4, the pressure sensor fixing seat 209, the electronic part shell 2010, the intelligent control unit 202 and the power supply (power supply module) 203 are arranged in the electronic part shell 2010. The pressure sensor 201 is fixed on the pressure sensor fixing seat 209, and the pressure sensor 201 is communicated with the pressure detector 103 on an air path. The mechanical part shell 101 and the electronic part shell 2010 are independent or separated from each other, and the intelligent control unit 202 is respectively connected with the temperature sensor 3, the pressure sensor 201 and the communication module 4. The pressure sensor 201 is hermetically fixed on the sensor housing 207 through the insulators 204, 205, 206, and then is installed and fixed on the pressure sensor fixing seat 209. A shield 208 is provided inside the sensor housing 207 to improve the interference rejection capability of the monitoring device. Meanwhile, a shielding member 2011 is arranged on the inner side (or the outer side) of the electronic part shell 2010, so that the anti-interference capacity of the monitoring device is further improved. The shield 2011 may shield the electric field or the magnetic field by utilizing the reflection and/or absorption of the shield material to reduce EMI emissions. The effective addition of the shielding material can reduce or eliminate unnecessary gaps, inhibit electromagnetic coupling radiation and reduce electromagnetic leakage and interference, and a material with higher conductivity and magnetic conductivity can be used as an electromagnetic shielding material (such as iron), and the shielding performance is generally required to be 40-60 dB. In particular, the electronic part 2 is sealed in a housing with a shielding material. The good sealing can well overcome the interference problem caused by electromagnetic leakage due to the electric discontinuity of the gap. One end of the pressure detector 103 and one end of the temperature compensating element 104 are fixed to the end base 108, the other end of the pressure detector 103 is hermetically connected to the base 102, the other end of the temperature compensating element 104 is connected to the movement 105 through a display link or the other end of the temperature compensating element 104 is directly connected to the movement 105, and the pointer 106 is attached to the movement 105 and provided in front of the dial 1012. The signal generator 109 may adopt a micro switch or a magnetic assisted electric contact, and the signal generator 109 outputs a contact signal of the monitoring device. The pressure detector 103 may employ a bourdon tube or a bellows tube. The temperature compensation element 104 may be a compensation plate or a gas enclosed in the mechanical part housing 101. The utility model discloses monitoring devices's mechanical part 1 can also include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge. The embodiment of the present invention provides an economical gas density monitoring device, which is based on the pressure detector 103 and utilizes the temperature compensation element 104 to correct the changed pressure and temperature to reflect the change of the gas density (sulfur hexafluoride). Under the pressure of the measured medium (sulfur hexafluoride) gas, due to the action of the temperature compensation element 104, when the density value of the (sulfur hexafluoride) gas changes, the pressure value of the (sulfur hexafluoride) gas also changes correspondingly, so that the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the measured sulfur hexafluoride gas is indicated on the dial 1012. The signal generator 109 serves as an output alarm latch contact signal. The monitoring device can display the density value of the (sulfur hexafluoride) gas. If the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, the pointer 106 moves towards the direction with small indicating value, the gas leakage degree is specifically displayed on the dial 1012, the signal generator 109 outputs (alarm locking) contact signals, and the density of sulfur hexafluoride gas in equipment such as an electrical switch and the like is monitored and controlled through a mechanical principle, so that the electrical equipment can work safely.
FIG. 3 is a schematic block diagram of a high-voltage electrical device, which is an embodiment of the present invention, showing in FIG. 3, the intelligent control unit 202 can be a general purpose computer, an industrial personal computer, a CPU, a single chip, an ARM chip, an AI chip, a quantum chip, a photonic chip, an MCU, an FPGA, a P L C, an industrial control motherboard, an embedded main control board, etc., the power supply 203 can be a switching power supply, an AC 220V, a DC power supply, a L DO, a programmable power supply, solar energy, a storage battery, a rechargeable battery, a battery, etc., the intelligent control unit 202 collects a pressure signal P through the pressure sensor 201, collects a temperature signal T through the temperature sensor 3, and utilizes SF to collect a temperature signal T6The mathematical model of the relationship between the gas pressure and the temperature is processed by the intelligent control unit 202 by adopting a soft measurement method to obtain the corresponding gas density value P20(i.e.a pressure value P of 20 ℃ C.)20) And the density value P can be further transmitted by the communication module 420Or gas density value P20And the pressure value P and the temperature value T or the pressure value P and the temperature value T are adopted, so that the gas density value P of the electrical equipment is monitored on line20Or gas density value P20Pressure value P and temperature value T, or pressure value P and temperature value T. Such as a monitoring deviceThe data communication modes such as RS-485 are accessed into the comprehensive automatic online monitoring system of the transformer substation and are remotely transmitted to the central monitoring station of the unattended station, the real-time monitoring is carried out at the local and remote central monitoring stations of the transformer substation, and the SF is realized6SF in electrical equipment6On-line monitoring of gas density.
In the present invention, the temperature sensor 3 and the temperature compensation element 104 are provided together; or the temperature sensor 3 is arranged directly on the temperature compensation element 104; or the temperature sensor 3 is arranged near the temperature compensation element 104, so that the temperature detected by the mechanical part is consistent with the temperature detected by the electronic part, the test precision of the monitoring device is greatly improved, and the performance of the monitoring device is greatly improved through the new design and processing.
In addition, the economical gas density monitoring device further comprises a heat insulation piece 5, wherein the heat insulation piece 5 is arranged between the mechanical part shell 101 and the electronic part shell 2010; or the thermal insulation is provided at the power supply (power module) 203. The power supply (power supply module) 203 is located away from the temperature sensor 3 and the temperature compensation element 104.
The electronic part 2 of the monitoring device further comprises a shielding part 2011, and the shielding part 2011 can play a role in shielding an electric field, a magnetic field, or both the electric field and the magnetic field. The shield 2011 is disposed inside or outside the electronics housing 2010. The pressure sensor 201 is provided with a shield 208. The intelligent control unit 202 or the communication module 4 is provided with a shielding piece; or the intelligent control unit 202 and the communication module 4 are both provided with shielding pieces. The economical gas density monitoring device also comprises insulation parts 204, 205 and 206, and the pressure sensor 201 is connected with a pressure sensor shell 207 and a pressure sensor fixing seat 209 through the insulation parts 204, 205 and 206; or the pressure sensor 201 is fixed on the pressure sensor fixing seat 209 in a sealing way through a plurality of insulating pieces 204, 205 and 206. The economical gas density monitoring device also comprises a plurality of insulating pieces, and the pressure sensor 201 is insulated from the electronic part shell 2010, the mechanical part shell 101 and the equipment connecting joint 1010 through the plurality of insulating pieces; or the sensor housing 207 and the housing of the economized gas density monitoring device are insulated. Through the innovative design and treatment, the performance of the device is greatly improved.
As can be known from Table 1, the economic gas density monitoring device adopting the technology has very good precision and stability, meets the high-precision requirement, and can improve the environment adaptability of the monitoring device. Meanwhile, the density testing precision of the gas leakage detector is very high, gas leakage can be found in time, the gas leakage problem can be treated in time, and SF is reduced6Gas leaks into the atmosphere, is favorable to the environmental protection, practices thrift the cost, has also ensured the electric wire netting safety simultaneously.
Table 1 comparison table of contact performance between economical gas density monitoring device of this patent technology and density relay of prior art
The economical gas density monitoring device has a density value P20The gas density value can be monitored in real time, or the gas density value obtained after an average value method, or can also be a trend value. The intelligent control unit 202 calculates and processes the gas density value of the electrical equipment by using an average value method (mean value method) to obtain a gas density value P20Average value P of20 average. The average value method is as follows: setting collection frequency in set time interval, calculating average value of density values (N) of different time points obtained by all the collections to obtain gas density value P20Average value P of20 averageThe trend change value △ P20Comprises the following steps: setting collection frequency in set time interval, calculating average value of density values (N) of different time points obtained by all the collections to obtain gas density value P20Average value P of20 averageThen, a trend calculation period T is setPeriod of timeObtaining a trend change value △ P20＝P20 average (previous T period value)-P20 average (T period)I.e. the mean value P20 averageFront-back period TPeriod of timeA difference of (d); or at a set time interval TSpacerWhen the gas density value P of the monitored electrical equipment is20Trend change value △ P of20＝P20 (previous T interval)-P20(T interval)I.e. density value P20Front-to-back time interval TSpacerA difference of (d); or at a set time interval TSpacerA set time length TLength of. Using a set time interval TSpacerSetting the collection frequency, and collecting all the density values P of different time points20Performing cumulative calculation to obtain cumulative value ∑P20Obtaining a trend change value △ P20＝∑P20 (previous T length)-∑P20 (when T length)I.e. the time length T before and afterLength ofAccumulated value ∑P20The difference between them. Wherein N is an integer of 1 or more.
The intelligent control unit 202 controls the gas density value P at certain intervals20Fourier transform is carried out, the frequency spectrum is converted, periodic components are filtered, or the components are decomposed into trend components, periodic components and random components according to time series, and gas leakage is judged according to the trend components.
The economical gas density monitoring device has a set density value P20 setThe density value can be set according to requirements or detected within a set time period in the past according to requirements. The set values can be modified and stored online.
In addition, the monitoring device can input events such as air supplement or/and air release tests and the like, and can carry out the gas density value P according to the corresponding events such as air supplement or/and air release tests and the like20New calculations or adjustments. The monitoring device monitors the gas density value P in a certain short time20Gradually increasing to determine gas supply event, and monitoring gas density value P20When the gas density is maximum, judging that the gas supplementing event is ended, and carrying out gas density value P20New calculations or adjustments. The monitoring device monitors the gas density value P in a certain short time20Gradually slightly decreasing, a deflation test (micro water or decomposition) event can be judged, and when the event is detectedGas density value P of20When the minimum value is reached, judging that the air discharge test event is ended, and carrying out gas density value P20New calculations or adjustments. The monitoring device can record the events of air supply or/and air discharge test, such as air supply time, air supply times and/or air quality.
The electronic signal contact 2012 can be implemented by an electromagnetic relay, a solid-state relay, a time relay, a power relay, a thyristor, an electronic switch, an electrical contact, an optocoupler, a DI, a MOS FET, a triode, a diode, a MOS FET relay, and other components. The electronic signal contact 2012 is connected in parallel or in series with the signal generator 109, or the electronic signal contact 2012 is connected in series or in parallel with a control circuit corresponding to the signal generator 109. When the gas density value P of the electrical equipment20Lower or higher than the set density value P20 setWhen the electronic signal contact 2012 acts to output the contact signal a, the existing monitoring mode can be economically and conveniently used to upload the air leakage information to the background, so that the operation and maintenance personnel can find the air leakage problem in time and deal with the problem in time, the emission of SF6 gas is reduced, and the method is environment-friendly and safe.
In a preferred embodiment, the signal generator 109 includes at least one mechanical signal contact, the mechanical signal contact is a first normally-open switch, and the electronic signal contact 2012 includes at least one second normally-open switch, the second normally-open switch is connected in parallel with the first normally-open switch, or the second normally-open switch is connected in parallel with a control loop corresponding to the signal generator 109. Alternatively, the mechanical signal contact is a first normally-closed switch, and the electronic signal contact 2012 includes at least one second normally-closed switch, where the second normally-closed switch is connected in series with the first normally-closed switch, or the second normally-closed switch is connected in series with a control circuit corresponding to the signal generator 109.
The intelligent control unit 202 collects pressure values and temperature values through a plurality of sensors, and then converts the pressure values and the temperature values into corresponding pressure values P of 20 ℃ according to gas characteristics and according to the collected gas pressure values and temperature values20I.e. density value P20. When density value P20Is less than or equal to the set value P20 setIn time, the intelligent control unit 202 can upload abnormal signals through the alarm contact signal line of the monitoring device, so that the operation and inspection personnel can know the abnormal information. Or when the density value P is20Is less than or equal to the set value P20 setIn time, the intelligent control unit 202 can upload the abnormal signal through the communication module 4, so that the operation and inspection personnel can know the abnormal information.
Or, the intelligent control unit 202 collects pressure values and temperature values through a plurality of sensors, and then converts the pressure values and temperature values into corresponding pressure values P of 20 ℃ according to gas characteristics and according to the collected gas pressure values and temperature values20I.e. gas density value P20. When the gas density value P is20Is smaller, and the smaller trend value thereof is greater than or equal to the set trend change value △ P20 setIn time, the intelligent control unit 202 can upload an abnormal signal through an alarm contact signal line of the monitoring device, so that the operation and inspection personnel can know abnormal information (air leakage); or the intelligent control unit can upload the abnormal signal through the communication module 4, so that the operation and inspection personnel can know the abnormal information.
The communication module 4 realizes remote transmission of information such as test data or/and state monitoring results. The communication module 4 is disposed at the electronic part housing 2010 or the mechanical part housing 101, or the communication module 4 and the intelligent control unit 202 are integrally designed together. The communication mode of the communication module 4 can be a wired or wireless mode. The sensors may be pressure sensors, temperature sensors, or density measurement sensors. The intelligent control unit 202 can measure a mechanical density relay or density switch of the relative pressure and absolute pressure type. The intelligent control unit 202 is provided with an interface and can complete test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 202 is also provided with a clock which can record test time.
In a preferred embodiment, the electronic part 2 outputs the contact signal B when the gas pressure value of the electrical equipment monitored by the electronic part 2 is lower or higher than the set pressure value, or when the temperature value of the electrical equipment monitored by the electronic part 2 is lower or higher than the set temperature value.
The monitoring device also comprises a micro-water sensor which can monitor the micro-water value of the gas on line, when the micro-water value exceeds a set value, the electronic part 2 outputs a contact signal to monitor the micro-water content of the air chamber of the electrical equipment in time, and the safety of the power grid is guaranteed.
The monitoring device also comprises a decomposed product sensor which can monitor the decomposed products of the gas on line, and when the content of the decomposed products exceeds a set value, the electronic part 2 outputs a contact signal.
The monitoring device can upload the monitored data and information thereof in a regular coded form through electronic signal contacts 2012, the electronic signal contacts 2012 are connected in parallel or in series to the signal generator 109 or a dedicated line, or other lines. Specifically, the monitored data and information include: the monitored density value, pressure value, temperature value, state information of the signal generator, abnormal information (self abnormal phenomena such as over-low density value, over-high pressure, over-high temperature of the electrical equipment, pressure of the monitoring device, temperature sensor and the like), and self-diagnosis result.
The monitoring device can upload monitored data and information thereof in a P L C power carrier mode through an alarm signal line, a locking signal line or a special signal line of the density relay.
The monitoring device also includes a delay circuit. Specifically, the delay of the analog circuit, or the delay of the digital circuit, or the mixed delay of the analog circuit and the digital circuit may be used. In addition, the monitoring device can be automatically calibrated, and operates once within set time after being started up each time; a regular clearing function is designed, fitting of a measurement curve and a theoretical curve is guaranteed, long-term drift is avoided, and long-term stability and accuracy of measurement are guaranteed, so that SF can be well solved6Accurate measurement of gas pressure.
The monitoring device has a self-diagnosis function and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc. When the density of the monitoring device monitors that the gas pressure has a rising trend on line, an abnormal notice should be put forward in time. The monitoring device also comprises a camera for monitoring the monitoring device. The monitoring device has the protection to the environmental temperature of the electronic components, prevents the over-low temperature or over-high temperature from working, and enables the monitoring device to work in an allowable temperature range. A heater and/or a radiator (fan) can be arranged, the heater is started at low temperature, and the radiator (fan) is started at high temperature, so that the pressure sensor and/or the integrated circuit and other electronic elements can reliably work in low-temperature or high-temperature environments. The monitoring device has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment and the monitoring device.
In this application, the electrical equipment comprises SF6Gas electric apparatus, SF6The electrical equipment comprises GIS, GI L, PASS, circuit breaker, current transformer, voltage transformer, gas-filled cabinet, ring main unit, etc. when the mechanical part is density relay or density switch, the density relay or density switch comprises bimetallic strip compensated gas density relay, gas compensated gas density relay, or bimetallic strip and gas compensated mixed gas density relay, fully mechanical gas density relay, digital gas density relay, mechanical and digital combined gas density relay, gas density relay with pointer display, digital gas density relay, gas density switch without display or indication, SF6Gas density relay, SF6A hybrid gas density relay, an N2 gas density relay, other gas density relays, and the like.
Example two:
fig. 4 is a schematic structural diagram of a high-performance economical gas density monitoring device for high-voltage electrical equipment according to the second embodiment of the present invention, as shown in fig. 4, the economical gas density monitoring device includes a mechanical portion 1 and an electronic portion 2 independent from the mechanical portion; wherein the mechanical part 1 and the electronic part 2 are independent and are designed separately. Mechanical part 1 and electronic partThe branch 2 is arranged on a multi-way connector 6 and is arranged on the electrical equipment through the multi-way connector 6. The mechanical part 1 is a density relay, which comprises a pressure detector 103, a temperature compensation element 104, and a plurality of signal generators 109. The electronic part 2 is a density monitor or a transmitter, and comprises a plurality of sensors (a pressure sensor 201 and a temperature sensor 3) and an intelligent control unit 202. The intelligent control unit 202 is respectively connected with a plurality of sensors (pressure sensor 201 and temperature sensor 3). Pressure and temperature signals are acquired by a plurality of sensors (a pressure sensor 201 and a temperature sensor 3), and corresponding density values P are obtained through processing of an intelligent control unit 202 according to the gas pressure-temperature characteristics20(i.e.a pressure value P of 20 ℃ C.)20) Further realizing the on-line monitoring of the gas density value P of the electrical equipment20(or density value P)20Pressure value P, temperature value T, or pressure value P, temperature value T). The electronic part 2 comprises an electronic signal contact 2012 for monitoring the gas density value P of the electrical apparatus monitored by said electronic part 220Lower or higher than the set density value P20When setting, the electronic part outputs a contact signal A, so that the operation and inspection personnel can know abnormal information; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Trend change value △ P of20Lower or higher than the set trend change value △ P20 setMeanwhile, the monitoring device outputs a contact signal; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Average value P of20 averageLower or higher than the set density average value P20 average settingThe monitoring device outputs a contact signal. Similarly, the density monitoring device has very high density testing precision, can find gas leakage in time, deal with the gas leakage problem in time and reduce SF6Gas leaks into the atmosphere, does benefit to the environmental protection, practices thrift the cost, also ensures the electric wire netting safety simultaneously.
Example three:
fig. 5 shows a gas density monitoring system composed of a high-performance economical gas density monitoring device according to a third embodiment of the present invention. As shown in fig. 5, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of gas density monitoring devices are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. And each gas density monitoring device is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber.
In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of gas density monitoring devices, such as a HUB1 connected with gas density monitoring devices Z11, Z12 and … … Z1n, a HUB2 connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and a HUB is connected with gas density monitoring devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
The background monitoring terminal comprises 1) a background software platform, namely, a background software key business module based on Windows, L inux and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS and MacOS.2), such as authority management, equipment management, data storage inquiry and the like, user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data acquisition, data analysis, recording conditions, exception handling and the like, and 3) interface configurations such as a Form interface, a Web interface, a configuration interface and the like.
Example four:
fig. 6 shows a gas density monitoring system composed of a high-performance economical gas density monitoring device according to a fourth embodiment of the present invention. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the third embodiment. In this embodiment, the background monitor terminal PC connects two integrated application servers 1, Server2 through network switch Gateway, two integrated application servers 1, Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2, … … ProCn) through station control layer a network and B network, and protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2, … … bm) through R5485 network. Each HUB is connected with a group of gas density monitoring devices, such as a HUB1 connected with gas density monitoring devices Z11, Z12 and … … Z1n, a HUB2 connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and a HUB is connected with gas density monitoring devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
To sum up, the utility model provides an economical gas density relay and system that high pressure or medium voltage electrical equipment used can overcome traditional mechanical type SF6SF of electrical equipment cannot be accurately monitored by gas density relay6The problem of gas density can overcome the problem that the investment is big, the site operation is inconvenient again, can in time inform fortune dimension personnel of the accurate information of gas leakage, in time handles the gas leakage problem, improves the security performance, reduces the operation maintenance cost, ensures the electric wire netting safe operation. At the same time, SF can be greatly reduced6The gas is discharged, the environment is protected, and the method is beneficial to the nation and the people.
The gas density monitoring device is broadly referred to as a gas density monitoring device, a gas density relay + transmitter, a remote gas density relay, and the like.
The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (22)
1. An economical gas density monitoring device, comprising: a mechanical part and an electronic part;
the mechanical part comprises a base, a pressure detector, a temperature compensation element, at least one signal generator and an equipment connecting joint, and the mechanical part outputs a joint signal through the signal generator;
the electronic part comprises a pressure sensor, a temperature sensor, an intelligent control unit and an electronic signal contact, and the electronic signal contact is connected with the signal generator in series and/or in parallel, or the electronic signal contact is connected with a control loop corresponding to the signal generator in series or in parallel; the intelligent control unit is respectively connected with the pressure sensor and the temperature sensor and is used for acquiring a pressure value acquired by the pressure sensor and a temperature value acquired by the temperature sensor and processing the pressure value and the temperature value to obtain a corresponding gas density value; the intelligent control unit controls the electronic signal contact, and when the gas density value monitored by the electronic part is lower than or higher than a set density value, the intelligent control unit controls the electronic signal contact to act and output a corresponding contact signal;
wherein, the mechanical part and the electronic part are designed separately or integrally.
2. An economical gas density monitoring device according to claim 1, characterized in that: the signal generator comprises at least one mechanical signal contact, the mechanical signal contact is a first normally-open switch, the electronic signal contact comprises at least one second normally-open switch, and the second normally-open switch is connected with the first normally-open switch in parallel or is connected with a control loop corresponding to the first normally-open switch in parallel; or,
the mechanical signal contact is a first normally-closed switch, the electronic signal contact comprises at least one second normally-closed switch, and the second normally-closed switch is connected with the first normally-closed switch in series or the second normally-closed switch is connected with a control loop corresponding to the first normally-closed switch in series.
3. An economical gas density monitoring device according to claim 1, characterized in that: the contact signal output by the electronic part and the contact signal output by the mechanical part both comprise an alarm and/or a lock.
4. An economical gas density monitoring device according to claim 1, characterized in that: the mechanical part is a density relay or a density switch; the electronic part is a density transmitter or a density sensor.
5. An economical gas density monitoring device according to claim 1, characterized in that: the electronic signal contact comprises one or more of an electromagnetic relay, a solid-state relay, a time relay, a power relay, a silicon controlled rectifier, an electronic switch, an electric contact, an optical coupler, DI, an MOS field effect transistor, a triode, a diode and an MOS FET relay.
6. An economical gas density monitoring device according to claim 1, characterized in that: the signal generator comprises a microswitch or a magnetic auxiliary electric contact; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element is a compensation element formed by a bimetallic strip or a compensation element filled with compensation gas.
7. An economical gas density monitoring device according to claim 1, characterized in that: when the pressure value monitored by the electronic part is lower than or higher than the set pressure value, the electronic part outputs a contact signal; and/or the presence of a gas in the gas,
when the temperature value monitored by the electronic part is lower than or higher than the set temperature value, the electronic part outputs a contact signal.
8. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device further comprises a multi-way connector, and the mechanical part and the electronic part are arranged on the multi-way connector.
9. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device also comprises a micro-water sensor for monitoring the micro-water value of the gas, and when the micro-water value of the gas exceeds a set value, the electronic part outputs a contact signal; and/or the presence of a gas in the gas,
the monitoring device also comprises a decomposed product sensor for on-line monitoring of the decomposed product of the gas, and when the content of the decomposed product of the gas exceeds a set value, the electronic part outputs a contact signal.
10. The economical gas density monitoring device according to claim 1, wherein the monitoring device uploads monitored data and information thereof through an alarm signal line, a locking signal line or a special signal line in a P L C power carrier mode.
11. An economical gas density monitoring device according to claim 1, characterized in that: the intelligent control unit is provided with an electrical interface, the electrical interface finishes test data storage, and/or test data export, and/or test data printing, and/or carries out data communication with an upper computer, and/or inputs analog quantity and digital quantity information.
12. An economical gas density monitoring device according to claim 1, characterized in that: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or state monitoring results.
13. An economical gas density monitoring device according to claim 12, characterized in that: the communication mode of the communication module is a wired communication mode or a wireless communication mode; wherein,
the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, P L C power carrier and a cable;
the wireless communication mode comprises one or more of a 5G/NB-IOT communication module arranged in the sensor, a 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.
14. An economical gas density monitoring device according to claim 1, characterized in that: the intelligent control unit is controlled through field control and/or through a background monitoring terminal.
15. An economical gas density monitoring device according to claim 1, characterized in that: at least one temperature sensor is arranged in the vicinity of, on or integrated in a temperature compensation element of the mechanical part.
16. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.
17. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.
18. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device compares the environmental temperature value with the temperature value collected by the temperature sensor to complete the calibration of the temperature sensor.
19. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device further comprises a delay circuit, wherein the delay circuit comprises analog circuit delay, digital circuit delay or mixed delay of an analog circuit and a digital circuit.
20. An economical gas density monitoring device according to claim 1, characterized in that: the monitoring device also comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with a display value display.
21. An economical gas density monitoring device according to claim 1, characterized in that: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current data value in real time and/or supports data input.
22. An economical gas density monitoring system, characterized in that: the system is comprised of the economical gas density monitoring device of any one of claims 1 to 21; alternatively, the system comprises an economical gas density monitoring apparatus as claimed in any one of claims 1 to 21.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426316A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of economical gas density detecting device and system |
| CN113758653A (en) * | 2021-09-09 | 2021-12-07 | 河南平高电气股份有限公司 | A method for real-time monitoring of SF6 density relay and prediction of gas leakage |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426316A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of economical gas density detecting device and system |
| CN110426316B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Economical gas density monitoring device and system |
| CN113758653A (en) * | 2021-09-09 | 2021-12-07 | 河南平高电气股份有限公司 | A method for real-time monitoring of SF6 density relay and prediction of gas leakage |
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