WO2021227583A1

WO2021227583A1 - Digital gas density relay having self-diagnosis function and self-diagnosis method of relay

Info

Publication number: WO2021227583A1
Application number: PCT/CN2021/076137
Authority: WO
Inventors: 金海勇
Original assignee: 上海乐研电气有限公司
Priority date: 2020-05-15
Filing date: 2021-02-09
Publication date: 2021-11-18
Also published as: CN111508770A

Abstract

Disclosed are a digital gas density relay having a self-diagnosis function and a self-diagnosis method of the relay. The relay comprises a gas density detection sensor, an intelligent control unit, an annunciator, a communication module, a normally-open electric control valve, and a normally-closed electric control valve; one end of the normally-open electric control valve is provided with an interface communicated with an electrical device, the other end of the normally-open electric control valve is communicated with one end of the normally-closed electric control valve, the other end of the normally-closed electric control valve is communicated with air, and the gas density detection sensor is provided on a gas path between the normally-open electric control valve and the normally-closed electric control valve; the intelligent control unit is connected to the gas density detection sensor, the annunciator, the communication module, the normally-open electric control valve, and the normally-closed electric control valve, respectively, so as to complete on-line monitoring of the gas density value of the electrical device and control the annunciator to control switching of the on-off states of the normally-open electric control valve and the normally-closed electric control valve. According to the present application, online self-inspection or self-diagnosis is completed while the gas density of the gas-insulated or arc-extinguished electrical device is monitored, no maintenance is required, operation and maintenance costs are reduced, and safe operation of a power grid is guaranteed.

Description

Digital gas density relay with self-diagnosis function and self-diagnosis method thereof

This application claims the application on May 15 2020, Application No. 202010416649.7 (Title: Digital gas density relay having a self-diagnostic function and self-diagnostic method) priority of Chinese patent application.

Technical field

The invention relates to the field of electric power technology, in particular to a digital gas density relay with self-diagnosis function applied to high-voltage and medium-voltage electrical equipment and a self-diagnosis method thereof.

Background technique

With the development of unmanned substations in the direction of networking and digitization, and the increasing requirements for remote control and remote measurement, the online monitoring of the gas density and micro water content status of SF6 electrical equipment has important practical significance. With the continuous vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important part and key node of smart substations, plays a pivotal role in the security of smart grids. High-voltage electrical equipment is currently mostly SF6 gas insulated equipment. If the gas density is reduced (caused by leakage, etc.), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, online monitoring of gas density values in SF6 high-voltage electrical equipment has become very common. For this reason, the application of gas density monitoring systems (gas density relays) will flourish. The current gas density monitoring system (gas density relay) is basically: 1) The use of remote SF6 gas density relay to realize the collection and upload of density, pressure and temperature, and to realize on-line monitoring of gas density. 2) Use gas density transmitter to realize the collection and upload of density, pressure and temperature, and realize online monitoring of gas density. The remote transmission type SF6 gas density relay or gas density transmitter is the core and key component, and how to ensure normal operation is very important.

Therefore, it is now very necessary to develop a digital gas density relay or gas density monitoring device with self-diagnosis function, which is used in the gas density monitoring system based on the ubiquitous power Internet of Things, and passes the zero calibration of the gas density detection sensor. Diagnosis, to obtain the current working status of the digital gas density relay, can realize the self-diagnosis or self-check of the digital gas density relay, realize maintenance-free, improve work efficiency, and ensure the safe operation of the power grid.

Summary of the invention

The present invention provides a digital gas density relay (gas density monitoring device) with self-diagnostic function for high-voltage or medium-voltage electrical equipment and a self-diagnostic (or self-test) method for gas insulation or arc extinguishing While monitoring the gas density of electrical equipment, it also obtains the current working status of the digital gas density relay through the zero calibration diagnosis of the digital gas density detection sensor, and completes the online self-check or self-diagnosis of the digital gas density relay , Improve work efficiency, no passive maintenance, reduce operation and maintenance costs, and ensure the safe operation of the power grid.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

The first aspect of this application discloses a digital gas density relay (or gas density monitoring device) with a self-diagnostic function, including: a gas density detection sensor, an intelligent control unit, an annunciator, a communication module, and a normally open electric control valve And normally closed electric control valve;

One end of the normally open electronic control valve is provided with an interface communicating with electrical equipment, the other end is connected to one end of the normally closed electronic control valve, and the other end of the normally closed electronic control valve is connected to air, and a gas density detection sensor Installed on the gas circuit between the normally open electronic control valve and the normally closed electronic control valve, used to collect the pressure value and temperature value, and/or the gas density value of the gas circuit between the normally open electronic control valve and the normally closed electronic control valve ；

The intelligent control unit is respectively connected with a gas density detection sensor, an annunciator, a communication module, a normally open electronic control valve, and a normally closed electronic control valve; the intelligent control unit is configured to obtain data collected by the gas density detection sensor The gas density value, or, the intelligent control unit is configured to obtain the pressure value and temperature value collected by the gas density detection sensor, and convert it into a gas density value according to the gas pressure-temperature characteristic; the intelligent control unit uploads it through the communication module One or more of the gas density value, pressure value, and temperature value is used to complete the online monitoring of the gas density of the monitored electrical equipment by the digital gas density relay; the intelligent control unit is also configured as a control annunciator, The annunciator outputs alarm and/or blocking contact signals, and controls the switching state of the normally open electric control valve and the normally closed electric control valve.

Among them, the above-mentioned digital gas density relay with self-diagnosis function refers to the design of its constituent elements into an integrated structure; and the gas density monitoring device with self-diagnosis function refers to the design of its constituent elements into a body structure and flexible composition.

Preferably, the normally open electronic control valve is configured to close the gas path between the electrical equipment and the gas density detection sensor and the normally closed electronic control valve; the normally closed electronic control valve is configured to open the gas density detection sensor The gas circuit connects the gas density detection sensor with the air, and is used to realize the zero calibration diagnosis of the gas density detection sensor.

Preferably, the intelligent control unit controls the annunciator to not output an alarm and/or lock contact signal during the zero check diagnosis.

Preferably, when the gas density value is lower and/or higher than the set preset threshold value, the intelligent control unit controls the annunciator to make the annunciator output an alarm and/or blocking contact signal for completing the pairing Monitoring of gas density values in electrical equipment.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a digital gas density relay housing, the gas density detection sensor, intelligent control unit, annunciator, communication module, One or more of the normally open electronic control valve and the normally closed electronic control valve are located in the housing of the digital gas density relay. Preferably, the gas density detection sensor, the normally open electric control valve, and the normally closed electric control valve are located in the housing of the digital gas density relay.

Preferably, the gas density detection sensor includes a pressure sensor and a temperature sensor; or, the gas density detection sensor is a gas density transmitter composed of a pressure sensor and a temperature sensor; or, the gas density detection sensor is Density detection sensor of quartz tuning fork technology.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a display unit, and the intelligent control unit displays the gas density value, pressure value, temperature value, and current working status through the display unit. One or more of the monitoring signals and/or information.

Preferably, the current working state of the digital gas density relay (or gas density monitoring device) with self-diagnosis function includes: normal working state and abnormal working state.

More preferably, when the current working state is an abnormal working state, the digital gas density relay (or gas density monitoring device) with a self-diagnosis function sends out an abnormal prompt.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a multi-way connector, the normally open electronic control valve, the gas density detection sensor, and the normally closed electronic control valve They are respectively arranged on the multi-way joints; on the gas path, the other end of the normally open electric control valve is respectively connected with the gas density detection sensor and one end of the normally closed electric control valve through the multi-way joint.

In a preferred embodiment, the first port of the multi-way connector is connected to the other end of the normally open electronic control valve, the second port of the multi-way connector is connected to one end of the normally closed electronic control valve, and the gas density detection The sensor is installed on the gas path between the normally open electric control valve and the normally closed electric control valve through the third interface of the multi-way joint.

In a preferred embodiment, the gas density detection sensor is installed on the third interface of the multi-way joint; or the third interface of the multi-way joint is connected with a gas collection pipeline, and the gas density detection sensor is installed On the gas collection pipeline.

More preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a comparison sensor, the comparison sensor is also arranged on the multi-way connector, and the comparison sensor passes through the multi-pass The joint is connected with the gas density detection sensor on the gas path.

In a preferred embodiment, the first port of the multi-way connector is connected to the other end of the normally open electronic control valve, the second port of the multi-way connector is connected to one end of the normally closed electronic control valve, and the gas density detection The sensor is installed to the gas circuit between the normally open electric control valve and the normally closed electric control valve through the third interface of the multi-way connector, and the comparison sensor is installed to the normally open electric valve through the fourth interface of the multi-way connector. The gas path between the control valve and the normally closed electric control valve.

In a preferred embodiment, the comparison sensor is installed on the fourth interface of the multi-way connector; or the fourth interface of the multi-way connector is connected with a second gas collection pipe, and the comparison sensor is installed On the second gas collection pipeline.

Further, the comparison sensor includes a second pressure sensor; or, the comparison sensor includes a second pressure sensor and a second temperature sensor; or, the comparison sensor is a second pressure sensor and a second pressure sensor. A second gas density transmitter composed of temperature sensors; or, the comparison sensor is a second density detection sensor using quartz tuning fork technology.

Among them, the above-mentioned density detection sensor of quartz tuning fork technology, or the second density detection sensor of quartz tuning fork technology, both use the constant resonance frequency of a quartz oscillator in a vacuum and a quartz oscillator of the same origin in the measured gas. The resonance frequency difference of the detector is proportional to the density of the gas to be measured. After processing, an analog signal or a digital signal of the gas density value is obtained.

Among them, the above-mentioned temperature sensor, or the second temperature sensor, can be a thermocouple, a thermistor, or a semiconductor type; it can be a contact or non-contact type; it can be a thermal resistance or a thermocouple; it can be a digital or analog type .

Among them, the above-mentioned pressure sensor or the second pressure sensor can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil attached to a Baden tube), or a resistance pressure sensor (For example, pressure sensor with slide wire resistance attached to the Baden tube); it can be an analog pressure sensor or a digital pressure sensor.

Further, the intelligent control unit compares and diagnoses the first pressure value P1 collected by the gas density detection sensor and the second pressure value P2 collected by the comparison sensor under the same gas pressure; and/or, the intelligent control unit Perform comparison diagnosis between the first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor at the same gas temperature; or, the intelligent control unit performs comparison diagnosis on the same gas density by the gas density detection sensor The first density value P1 ₂₀ collected and the second density value P2 ₂₀ collected by the comparison sensor are compared and diagnosed to obtain the current working status of the digital gas density relay.

Further, the intelligent control unit uploads the received data to the backend through the communication module, and the backend compares the first pressure value P1 collected by the gas density detection sensor and the second pressure value P2 collected by the comparison sensor under the same gas pressure. Perform comparison diagnosis; and/or, the background performs comparison diagnosis on the first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor at the same gas temperature; or, the background _{The first density value P1 20} collected by the gas density detection sensor and the second density value P2 ₂₀ collected by the comparison sensor under the same gas density are compared and diagnosed to obtain the current working status of the digital gas density relay.

In a preferred embodiment, the gas density detection sensor includes a pressure sensor and a temperature sensor, and the comparison sensor includes a second pressure sensor and a second temperature sensor; the pressure value collected by the pressure sensor of the gas density detection sensor is the first pressure value P1 , The temperature value collected by the temperature sensor is the first temperature value T1; the pressure value collected by the second pressure sensor of the comparison sensor is the second pressure value P2, and the temperature value collected by the second temperature sensor is the second temperature value T2; The intelligent control unit and/or the background compares the first pressure value P1 with the second pressure value P2 to obtain the pressure difference |P1-P2|, and/or compares the first temperature value T1 with the second temperature value T2 , Obtain the temperature difference |T1-T2|; if the pressure difference |P1-P2| and/or the temperature difference |T1-T2| are respectively within its preset threshold, the digital gas density relay (or gas density monitoring device The current working state of) is the normal working state, otherwise, it is the abnormal working state.

In a preferred embodiment, the gas density value collected by the gas density detection sensor is the first density value P1 ₂₀ , and the gas density value collected by the comparison sensor is the second density value P2 ₂₀ ; the intelligent control unit and/or background The first density value P1 _{20 is} compared with the second density value P2 ₂₀ to obtain the density difference |P1 ₂₀ -P2 ₂₀ |; if the density difference |P1 ₂₀ -P2 ₂₀ | is within its preset threshold, the number The current working state of the gas density relay (or gas density monitoring device) is the normal working state, otherwise, it is the abnormal working state.

Further, at the time of zero check diagnosis, that is, at zero pressure, the pressure signal collected by the gas density detection sensor is the first pressure signal P1 ₀ , and the pressure signal collected by the comparison sensor is the second pressure signal P2 ₀ . The intelligent control unit and/or the background compares the first pressure signal P1 ₀ and the second pressure signal P2 ₀ with zero pressure respectively; if the pressure difference |P1 ₀ -0|≥ the preset threshold, the intelligent control unit detects the gas density pressure sensor signals acquired by correcting the first corrected pressure signal P1 _{0 repair} less than a corresponding predetermined threshold value; and / or, if the pressure differential | P2 ₀ -0 | ≥ preset threshold value, the sensor matching unit ITES correcting the acquired pressure signal, the second corrected pressure signal P2 _{0 repair} less than a corresponding preset threshold.

Further, the gas density detection sensor includes a temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the temperature sensor of the gas density detection sensor to complete the gas density detection sensor Temperature sensor verification; and/or, the comparison sensor includes a second temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the second temperature sensor of the comparison sensor Yes, complete the verification of the second temperature sensor against the sensor.

In a preferred embodiment, the collected temperature value is the first temperature value T1, the ambient temperature value is the second temperature value TH, and the intelligent control unit and/or the background combines the first temperature value T1 with the second temperature value TH Perform comparison to obtain the temperature difference |T1-TH|; if the temperature difference |T1-TH| is within its preset threshold, the current working state of the digital gas density relay (or gas density monitoring device) is normal operation State, otherwise, it is an abnormal working state; wherein, the first temperature value T1 comes from the gas density detection sensor or from the comparison sensor.

Among them, the above-mentioned environmental temperature value is obtained by comprehensive judgment of the temperature value of other detection points of the system including a digital gas density relay (or gas density monitoring device); or it is obtained according to the weather forecast; or it is obtained from the same The temperature values of other detection points in the substation are obtained through comprehensive judgment.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are randomly arranged and combined, and each combination is converted according to the gas pressure-temperature characteristic Become multiple pressure values corresponding to 20°C, that is, gas density values, compare each gas density value to complete the self-diagnosis of each pressure sensor and each temperature sensor; or,

The pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor traverse all permutations and combinations, and convert each combination into multiple pressure values corresponding to 20°C according to the gas pressure-temperature characteristics, that is, the gas density value, and the density of each gas Compare the values to complete the self-diagnosis of each pressure sensor and each temperature sensor; or,

The multiple gas density values, pressure values, and temperature values obtained by each pressure sensor and each temperature sensor are compared to complete the self-diagnosis of each pressure sensor and each temperature sensor.

Among them, the above-mentioned self-diagnosis of each pressure sensor and each temperature sensor can be completed by the intelligent control unit or the background.

Preferably, the intelligent control unit uses an average value method (average value method) to calculate the gas density value, and the average value method is: within a set time interval, set the collection frequency, and collect all the different time points obtained Calculate the average value of N gas density values to obtain the gas density value; or,

In the set time interval, set the temperature interval step length, and calculate the average value of the density values corresponding to the N different temperature values collected in the entire temperature range to obtain the gas density value; or,

In the set time interval, set the pressure interval step length, and calculate the average value of the density values corresponding to the N different pressure values collected in the entire pressure change range to obtain the gas density value;

Among them, N is a positive integer greater than or equal to 1.

Preferably, the annunciator includes, but is not limited to, one of an electromagnetic relay, a solid state relay, a MOS FET relay, a power relay, an electronic switch, and a thyristor.

Preferably, the digital gas density relay (or gas density monitoring device) with a self-diagnostic function further includes a filter connected to the other end of the normally closed electric control valve.

Preferably, the communication mode of the communication module includes a wired communication mode and a wireless communication mode.

More preferably, the wired communication mode includes one of RS232 bus, RS485 bus, RS422 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable Or several.

More preferably, the wireless communication method includes a built-in sensor 5G/NB-IOT communication module (such as 5G, NB-IOT), 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, One or more of sound waves, satellites, light waves, quantum communications, and sonar.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a protection circuit, the protection circuit is arranged on the intelligent control unit or connected to the intelligent control unit, and the protection circuit includes , But not limited to one or more of surge protection circuit, filter circuit, short circuit protection circuit, polarity protection circuit, and overvoltage protection circuit.

Preferably, the digital gas density relay (or gas density monitoring device) with a self-diagnostic function further includes a short circuit and/or open circuit diagnostic circuit, and the short circuit and/or open circuit diagnostic circuit is configured to detect the digital gas density relay. Diagnose the circuits that have short-circuit and/or open-circuit faults.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a heater and/or radiator connected to the intelligent control unit, and the intelligent control unit is connected to the intelligent control unit when the temperature is lower than the set value. Turn on the heater, or the intelligent control unit turns on the radiator when the temperature is higher than the set value.

Preferably, the intelligent control unit includes, but is not limited to, a microprocessor, a power supply, and data storage.

Preferably, the control of the intelligent control unit is through on-site control and/or through background control.

Preferably, the preset threshold can be modified on-site and/or in the background.

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 Analog quantity, digital quantity information.

Preferably, the intelligent control unit is further provided with a clock, and the clock is configured to periodically set the self-calibration time of the digital gas density relay, or record the test time, or record the event time.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes a display interface for human-computer interaction, and the display interface is connected with the intelligent control unit to display the current Verify data, and/or support data entry.

Preferably, the digital gas density relay (or gas density monitoring device) with self-diagnosis function further includes: micro water sensors respectively connected to the gas density detection sensor and the intelligent control unit, and/or respectively Decomposition sensor connected with the gas density detection sensor and the intelligent control unit.

Preferably, the digital gas density relay (or gas density monitoring device) with a self-diagnostic function further comprises: a contact resistance detection unit, the contact resistance detection unit is connected or connected with the contact signal of the digital gas density relay It is directly connected with the annunciator in the digital gas density relay; when the contact of the digital gas density relay is activated, and/or when an instruction to detect the contact resistance of the contact is received, the contact resistance detection unit can detect the digital The contact resistance value of the contact point of the type gas density relay.

Preferably, at least two of the digital gas density relays (or gas density monitoring devices) with self-diagnosis function are connected to a remote background detection system through a communication module; wherein, the digital gas density relays or gas density monitoring devices Set on the electrical equipment of the corresponding air chamber, the communication mode of the communication module includes a wired communication mode and a wireless communication mode.

More preferably, at least two of the digital gas density relays (or gas density monitoring devices) with self-diagnosis function are connected to the remote background detection system through a hub and a protocol converter in sequence; wherein, the digital gas density relay (Or gas density monitoring device) is installed on the electrical equipment of its corresponding gas chamber.

Further, the hub uses an RS485 hub; the protocol converter uses an IEC61850 or IEC104 protocol converter.

More preferably, the intelligent control unit completes the online diagnosis of the digital gas density relay (or gas density monitoring device) according to the setting of the remote background detection system or the remote control command; or, according to the setting of the digital gas density relay Diagnosis time, complete the online diagnosis of the digital gas density relay (or gas density monitoring device).

The second aspect of this application discloses a self-diagnostic method for a digital gas density relay with self-diagnostic function, including:

The intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor, and converts it into a gas density value according to the gas pressure-temperature characteristics; the intelligent control unit passes The communication module uploads one or more of the gas density value, pressure value, and temperature value to complete the online monitoring of the gas density of the monitored electrical equipment by the digital gas density relay; when the gas density value is lower than and/ Or when it is higher than the preset threshold, the intelligent control unit controls the annunciator to make the annunciator output alarm and/or blocking contact signals to complete the monitoring of the gas density value in the electrical equipment;

The normally open electronic control valve is closed by the intelligent control unit, and the gas path between the electrical equipment and the gas density detection sensor and the normally closed electronic control valve is shut off, and then the normally closed electronic control valve is controlled to open by the intelligent control unit to make the gas density The detection sensor is connected with the air to realize the zero calibration diagnosis of the gas density detection sensor;

When the zero calibration diagnosis is completed, the intelligent control unit controls the normally closed electric control valve to close, and then controls the normally open electric control valve to open, so that the digital gas density relay returns to the monitoring working state.

Preferably, the self-diagnosis method further includes: the gas density detection sensor includes a pressure sensor; when the normally open electronic control valve is in the closed state, that is, in the zero-check diagnosis state, the intelligent control unit controls the normally closed electric When the control valve is opened and the gas pressure of the gas path of the gas density detection sensor slowly drops to zero, the intelligent control unit receives the pressure signal P1 ₀ collected by the pressure sensor of the gas density detection sensor. If the pressure difference |P1 _0- 0|≥the preset threshold, the intelligent control unit sends out signals and/or information that the zero deviation of the pressure sensor of the gas density detection sensor is abnormal.

Preferably, the digital gas density relay further includes a comparison sensor, and the comparison sensor is in communication with the gas density detection sensor, the normally open electronic control valve, and the normally closed electronic control valve on the gas path; the self-diagnosis method further includes :

In the zero check diagnosis, the pressure signal collected by the gas density detection sensor is the first pressure signal P1 ₀ , and the pressure signal collected by the comparison sensor is the second pressure signal P2 ₀ , and the intelligent control unit and/or the background A pressure signal P1 ₀ and/or a second pressure signal P2 ₀ are respectively compared with zero pressure; if the pressure difference |P1 ₀ -0| ≥ the preset threshold, the intelligent control unit performs a check on the pressure signal collected by the gas density detection sensor Correction so that the corrected first pressure signal P1 _{0 is} smaller than the corresponding preset threshold; and/or, if the pressure difference |P2 ₀ -0|≥ the preset threshold, the intelligent control unit compares and corrects the pressure signal collected by the sensor a second pressure signal, the correction P2 _{0 repair} less than a corresponding preset threshold.

The intelligent control unit compares and diagnoses the first pressure value P1 collected by the gas density detection sensor and the second pressure value P2 collected by the comparison sensor under the same gas pressure; and/or, the intelligent control unit compares and diagnoses the same gas The first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor under temperature are compared and diagnosed; or, the intelligent control unit performs comparison diagnosis on the first temperature value T1 collected by the gas density detection sensor under the same gas density. A density value P1 ₂₀ and a second density value P2 ₂₀ collected by the comparison sensor are compared and diagnosed to obtain the current working status of the digital gas density relay; or,

The intelligent control unit uploads the received data to the background through the communication module, and the background compares the first pressure value P1 collected by the gas density detection sensor with the second pressure value P2 collected by the comparison sensor under the same gas pressure Diagnosis; and/or, the background compares and diagnoses the first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor at the same gas temperature; or, the background performs a comparison diagnosis on the same gas a first density value by the density of the collected gas density detection sensor P1 ₂₀ and the second sensor by the ratio of density values acquired P2 ₂₀ ratio for the diagnosis, obtain the current operating state of the digital relay gas density.

More preferably, the gas density detection sensor includes a pressure sensor and a temperature sensor, and the comparison sensor includes a second pressure sensor and a second temperature sensor; the pressure value collected by the pressure sensor of the gas density detection sensor is the first pressure value P1, and the temperature sensor collects The temperature value of is the first temperature value T1; the pressure value collected by the second pressure sensor of the comparison sensor is the second pressure value P2, and the temperature value collected by the second temperature sensor is the second temperature value T2; the intelligent control unit and / Or compare the first pressure value P1 with the second pressure value P2 under the same gas pressure in the background to obtain the pressure difference |P1-P2|, and/or compare the first temperature value T1 with the second pressure value P2 under the same gas temperature The temperature value T2 is compared to obtain the temperature difference |T1-T2|; if the pressure difference |P1-P2| and/or the temperature difference |T1-T2| are respectively within its preset threshold, the digital gas density relay The current working state of is the normal working state, otherwise, it is the abnormal working state.

More preferably, the gas density value collected by the gas density detection sensor is a first density value P1 ₂₀ , and the gas density value collected by the comparison sensor is a second density value P2 ₂₀ ; The first density value P1 ₂₀ and the second density value P2 ₂₀ are compared to obtain the density difference |P1 ₂₀ -P2 ₂₀ |; if the density difference |P1 ₂₀ -P2 ₂₀ | is within its preset threshold, then The current working state of the digital gas density relay is normal working state, otherwise, it is abnormal working state.

The above-mentioned comparison diagnosis is performed on the first pressure value and the second pressure value collected under the same gas pressure, and/or the first temperature value and the second temperature value collected under the same gas temperature are compared and diagnosed, or the same The comparison and diagnosis of the first density value and the second density value collected under the gas density can be performed by the intelligent control unit for comparison calculation, or the above-mentioned data can be transmitted to the background for comparison and calculation.

The gas density detection sensor includes a temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the temperature sensor of the gas density detection sensor to complete the temperature sensor of the gas density detection sensor. Check; and/or,

The gas density detection sensor includes a temperature sensor, and the intelligent control unit and/or background compares the corresponding temperature values collected by the temperature sensors of the gas density detection sensors of different electrical equipment in the same substation to complete the gas density detection The calibration of the temperature sensor of the sensor; and/or,

The comparison sensor includes a second temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the second temperature sensor of the comparison sensor to complete the comparison of the second temperature of the sensor Calibration of the sensor.

More preferably, the collected temperature value is the first temperature value T1, the ambient temperature value is the second temperature value TH, and the intelligent control unit and/or the background compares the first temperature value T1 with the second temperature value TH, Obtain the temperature difference |T1-TH|; if the temperature difference |T1-TH| is within its preset threshold, the current working state of the digital gas density relay or gas density monitoring device is the normal working state, otherwise, it is abnormal Working state; wherein, the first temperature value T1 comes from the gas density detection sensor or from the comparison sensor.

Among them, the above ambient temperature value is obtained by comprehensive judgment from the temperature values of other detection points of the system including the digital gas density relay; or it is obtained according to the weather forecast; or it is obtained from the temperature of other detection points in the same substation. The value is obtained through comprehensive judgment.

Among them, in the above-mentioned self-diagnosis method, in addition to judging whether the corresponding difference is within its preset threshold, it can also be judging whether the detection value is within its set range, or judging whether the quotient of the division of two corresponding detection values is Within its preset threshold.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the self-diagnosis method further includes:

The pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are randomly arranged and combined, and each combination is converted into multiple pressure values corresponding to 20°C according to the gas pressure-temperature characteristics, that is, the gas density value, and each gas density value is performed Comparing to complete the self-diagnosis of each pressure sensor and each temperature sensor; or,

Among them, the above-mentioned self-diagnosis of each pressure sensor and each temperature sensor can be completed by the background or the intelligent control unit.

Preferably, the intelligent control unit can generate a verification report after completing the self-diagnosis, and if there is an abnormality, an alarm is issued, and the report is uploaded to the remote end or sent to the designated receiver.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

1) A digital gas density relay (or gas density monitoring device) with self-diagnosis function is provided, which monitors and monitors the gas density of gas-insulated or arc-extinguishing electrical equipment, and at the same time, it also detects the zero of the sensor through the gas density Check and diagnose the digital gas density relay to obtain the current working status of the digital gas density relay, complete the online self-check or self-diagnosis of the digital gas density relay, improve work efficiency, no maintenance, reduce operation and maintenance costs, and ensure the safe operation of the power grid .

2) A self-diagnostic method for a digital gas density relay with self-diagnosis function is provided, which can support the normal operation of the above-mentioned digital gas density relay with self-diagnosis function.

Description of the drawings

The drawings constituting a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Fig. 1 is a schematic diagram of the circuit principle of a digital gas density relay with self-diagnosis function in the first embodiment;

2 is a schematic diagram of the gas circuit structure of the digital gas density relay with self-diagnosis function in the first embodiment;

3 is a schematic diagram of the circuit principle of the digital gas density relay with self-diagnosis function in the second embodiment;

4 is a schematic diagram of the gas circuit structure of the digital gas density relay with self-diagnosis function in the second embodiment;

Fig. 5 is a schematic diagram of the circuit principle of the digital gas density relay with self-diagnosis function in the third embodiment.

Detailed ways

In order to make the objectives, technical solutions, and effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments are only used to explain the present invention, but not used to limit the present invention.

Example one:

Figure 1 is a schematic diagram of the circuit principle of a digital gas density relay (or gas density monitoring device) with self-diagnosis function for high and medium voltage electrical equipment in the first embodiment of the present invention, and Figure 2 is a circuit diagram for the high and medium voltage electrical equipment in embodiment one , A schematic diagram of the gas circuit structure of a digital gas density relay (or gas density monitoring device) with self-diagnosis function.

As shown in Figure 1 and Figure 2, a digital gas density relay (or gas density monitoring device) with self-diagnosis function includes: digital gas density relay housing 14, gas density detection sensor 1, intelligent control unit 2 , Communication module 3, display unit 4, annunciator 5, temperature control unit 7, protection circuit (surge protection circuit 801, filter circuit 802, short circuit protection circuit 803), short circuit and/or open circuit diagnosis circuit 9, normally open electric control Valve 10, multi-way connector 11, normally closed electric control valve 12, filter 13. The gas density detection sensor 1 includes a pressure sensor 101 and a temperature sensor 102. The pressure sensor 101 is used to collect pressure values, and the temperature sensor 102 is arranged on the housing 14 of the digital gas density relay. The intelligent control unit 2 is connected to the pressure sensor 101 and the temperature sensor 102 of the gas density detection sensor 1, the communication module 3, the display unit 4, the annunciator 5, the heater 701, the fan 702, the short circuit and/or open circuit diagnosis circuit 9, and the normally open The electric control valve 10 and the normally closed electric control valve 12 are connected. The digital gas density relay housing 14 can also be provided with a shielding member outside or inside to improve the anti-electromagnetic interference capability.

Wherein, one end of the normally open electronically controlled valve 10 is provided with an interface communicating with electrical equipment for communicating with the electrical equipment on the gas path, and the other end is connected with a multi-way connector 11; the normally closed electronically controlled valve 12 One end of the gas density detection sensor 1 is connected to the multi-way connector 11, and the other end of the normally closed electronic control valve 12 is connected to the air (or directly connected to the air) through the filter 13; the pressure sensor 101 of the gas density detection sensor 1 is connected to the multi-way connector on the air path 11 Connected. The normally open electronic control valve 10 is configured to close the gas path between the electrical equipment and the gas density detection sensor 1 and the normally closed electronic control valve 12, and the normally closed electronic control valve 12 is configured to open the gas density detection sensor The gas path of 1 connects the gas density detection sensor 1 with the air, and realizes the zero calibration diagnosis of the pressure sensor 101 of the gas density detection sensor 1. During the zero check diagnosis, the intelligent control unit 2 controls the annunciator 5, and the annunciator 5 will not output alarm and/or blocking contact signals.

Among them, the intelligent control unit 2 includes a microprocessor 201, a memory 202, and a power supply 203.

The communication mode of the communication module 3 can be wired or wireless. For example, the wired mode of RS485 bus or the wireless mode of 5G/NB-IOT communication modules (such as 5G, NB-IOT) can be used to upload data or information. Of course, the wired communication method can also be any one or several of industrial buses such as RS232, RS422, CAN-BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, and PLC power carrier. The wireless communication method can also be any one or more of 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, acoustic wave, satellite, light wave, quantum communication, sonar .

Among them, the display unit 4 adopts liquid crystal or nixie tube elements to realize on-site display of data or information.

Among them, the annunciator 5 adopts an electromagnetic relay or a solid state relay, and the intelligent control unit 2 controls to turn on or off. Of course, the annunciator 5 may also be any one of a MOS FET relay, a power relay, an electronic control relay, an electronic switch, and a silicon controlled rectifier.

Among them, the temperature control unit 7 includes a heater 701 and a fan 702. When the ambient temperature is too low and the temperature is lower than the set value, the intelligent control unit 2 controls the heater 701 to turn on. When the ambient temperature is too high and the temperature is higher than the set value, the intelligent control unit 2 controls the fan 702 to turn on to make the digital The temperature inside the housing 14 of the type gas density relay is kept within a reasonable range to prevent excessively low or excessively high temperatures.

Among them, the surge protection circuit 801 adopts a discharge tube. When the voltage value of the instantaneous surge is too high, the discharge tube functions to release the excessively high surge voltage to protect the intelligent control unit 2. The filter circuit 802 adopts inductance and/or capacitance to filter, also to protect the intelligent control unit 2. The short-circuit protection circuit 803 adopts a thermistor or a self-recovery fuse. When a short circuit occurs, the self-recovery fuse of the short-circuit protection circuit 803 is disconnected to protect the intelligent control unit 2. Of course, the protection circuit may also include any one or more of a polarity protection circuit and an overvoltage protection circuit.

Among them, the short circuit and/or open circuit diagnosis circuit 9 is used to diagnose the main circuit of the digital gas density relay that has a short circuit and/or open circuit fault. In this embodiment, the short circuit and/or open circuit diagnosis circuit 9 adopts a current transformer or a Hall current sensor. When the short circuit and/or open circuit diagnosis circuit (ie, the Hall current sensor) 9 has too much current (short circuit occurs) or there is no current When (open circuit occurs), the intelligent control unit 2 can determine that there is a short circuit and/or an open circuit fault.

In addition, it may also be that at least two of the digital gas density relays (or gas density monitoring devices) are connected to a remote background detection system through a communication module; wherein, the digital gas density relays (or gas density monitoring devices) Set on the electrical equipment of its corresponding air chamber. The control of the intelligent control unit 2 is through on-site control and/or through background control. For example, at least two of the digital gas density relays (or gas density monitoring devices) are connected to a remote background detection system through a hub and a protocol converter in turn, wherein the hub may be an RS485 hub, and the protocol converter may Use IEC61850 or IEC104 protocol converter.

The working principle and working process of this embodiment are:

The intelligent control unit 2 obtains the pressure value P1 collected by the pressure sensor 101 of the gas density detection sensor 1, and the temperature value T1 collected by the temperature sensor 102, and converts it into a gas density value P1 ₂₀ according to its gas pressure-temperature characteristics; or the intelligent control unit 2 acquires a value of the density of the gas density of the gas detection sensor 1, a pressure sensor 101 and temperature sensor 102 acquired P1 _20. The intelligent control unit 2 uploads through the communication module 3, including, but not limited to _{, one or more of the} gas density value P120, the pressure value P1, and the temperature value T1 to complete the digital gas density relay's monitoring of the electrical equipment. Online monitoring of gas density. When the gas density value is lower or higher than the set contact preset threshold, the intelligent control unit 2 controls the annunciator 5 to make the annunciator 5 output alarm and/or lock contact signals to complete the electrical equipment Monitoring of gas density value. That is, the contact of the annunciator 5 is turned on, and the corresponding contact signal (alarm or lock) is sent to achieve the purpose of monitoring and controlling the sulfur hexafluoride gas density in electrical switches and other equipment, so that the electrical equipment can work safely. If the gas density value increases, the intelligent control unit 2 controls the annunciator 5, the contact of the annunciator 5 is disconnected, and the contact signal (alarm or lockout) is released. For example, suppose that the parameters of a digital gas density relay are: the rated pressure value is 0.6 MPa, the alarm contact pressure value is 0.55 MPa, and the locking contact pressure value is 0.50 MPa. When the equipment is running, there is a gas leak, and the gas density value drops to the alarm contact preset threshold value of 0.55MPa, then the intelligent control unit 2 controls the annunciator 5 to make the annunciator 5 output the alarm contact signal; and the gas density value drops to the lockout When the contact preset threshold is 0.50MPa, the intelligent control unit 2 controls the annunciator 5 to make the annunciator 5 output a latching contact signal to complete the monitoring of the gas density value in the electrical equipment, so that the electrical equipment can operate safely and reliably. The preset threshold value of the contact can be modified on-site and/or in the background. In the above monitoring state, the normally open electronic control valve 10 is in an open state, and the normally closed electronic control valve 12 is in a closed state.

Wherein, the intelligent control unit 2 uses an average value method (average value method) to calculate the gas density value for the purpose of making the monitoring data more accurate. Specifically, the average value method is: within a set time interval, set the collection frequency, and calculate the average value of all N gas density values at different time points obtained through the collection to obtain the gas density value; or, In the set time interval, set the temperature interval step length, calculate the average value of the density values corresponding to the N different temperature values collected in the entire temperature range to obtain the gas density value; or, in the setting In the time interval of, set the pressure interval step length, and calculate the average value of the density values corresponding to the N different pressure values collected in the entire pressure range to obtain the gas density value; where N is greater than or equal to 1 Is a positive integer.

In the zero check diagnosis, through the control of the intelligent control unit 2, the normally open electronic control valve 10 is in a closed state, and the intelligent control unit 2 controls and opens the normally closed electronic control valve 12 to make the gas pressure slowly drop to zero At the time, the intelligent control unit 2 receives the pressure signal P1 ₀ collected by the pressure sensor 101 of the gas density detection sensor 1, and if the pressure difference |P1 ₀ -0|≥ the preset threshold, the intelligent control unit 2 sends out a gas density detection The signal and/or information of the abnormal zero deviation of the pressure sensor 101 of the sensor 1. When the zero check diagnosis is completed, the intelligent control unit 2 closes the normally closed electric control valve 12, and then opens the normally open electric control valve 10 to restore the digital gas density relay to the monitoring working state. _{In addition, when the pressure signal P1 0} collected by the pressure sensor 101 of the gas density detection sensor 1, if the pressure difference |P1 ₀ -0|≥ the preset threshold, the intelligent control unit 2 can also collect the pressure sensor 101 of the gas density detection sensor 1 The pressure signal is corrected so that the corrected P1 _{0 correction} meets the corresponding preset threshold. Specifically, when there is no zero pressure, the pressure signal collected by the pressure sensor 101 of the gas density detection sensor 1 can be zeroed to restore the normal state.

In addition, after the digital gas density relay completes the zero calibration diagnosis of the pressure sensor 101 of the gas density detection sensor 1, if there is an abnormality, it can automatically send an alarm, and it can also be uploaded to the remote (monitoring room, background) through the communication module 3. Monitoring platform, etc.), or can be sent to a designated receiver, for example, sent to a mobile phone, and can also display notices on the spot. In short, multiple methods and multiple combinations can be used to fully ensure the reliable performance of the digital gas density relay.

Embodiment two:

Figure 3 is a schematic diagram of the circuit principle of a digital gas density relay (or gas density monitoring device) with self-diagnosis function for high and medium voltage electrical equipment of the second embodiment; Figure 4 is a schematic diagram of the circuit for the high and medium voltage electrical equipment of the second embodiment, A schematic diagram of the gas circuit structure of a digital gas density relay (or gas density monitoring device) with self-diagnosis function.

As shown in FIGS. 3 and 4, the difference from the first embodiment is that in this embodiment, a comparison sensor 6 is further included, and the comparison sensor 6 includes a second pressure sensor 601. In the gas path, the pressure sensor 101 of the gas density detection sensor 1 and the second pressure sensor 601 of the comparison sensor 6 are respectively connected to the multi-way connector 11. The normally open electronic control valve 10 is configured to shut off the gas density detection sensor 1, the comparison sensor 6, and the normally closed electronic control valve 12 and the gas path of the electrical equipment, and the normally closed electronic control valve 12 is configured to open the gas The gas path of the density detection sensor 1 and the comparison sensor 6 connects the gas density detection sensor 1 and the comparison sensor 6 with the air to realize the second pressure of the pressure sensor 101 of the gas density detection sensor 1 and/or the comparison sensor 6 The zero check diagnosis of the sensor 601. Similarly, during the zero check diagnosis, the intelligent control unit 2 can control the annunciator 5, and the annunciator 5 will not output alarm and/or blocking contact signals.

The working principle and working process of this embodiment are:

The working principle of the gas density value monitoring and the gas density value monitoring in this embodiment is the same as that of the first embodiment, and will not be repeated here.

In the zero check diagnosis, through the control of the intelligent control unit 2, the normally open electronic control valve 10 is in a closed state, and the intelligent control unit 2 controls and opens the normally closed electronic control valve 12 to make the gas pressure slowly drop to zero At the same time, the intelligent control unit 2 receives the pressure signal P1 ₀ _{collected by the pressure sensor 101 of the gas density detection sensor 1, and receives the second pressure signal P2 0} collected by the second pressure sensor 601 of the comparison sensor 6 . If the pressure difference |P1 ₀ -0|≥the preset threshold, the intelligent control unit 2 sends out a signal and/or information that the zero deviation of the pressure sensor 101 of the gas density detection sensor 1 is abnormal; if the pressure difference |P2 ₀ -0|≥preset A threshold is set, and the intelligent control unit 2 sends out a signal and/or information that the zero deviation of the second pressure sensor 601 of the comparison sensor 6 is abnormal.

When the zero check diagnosis is completed, the intelligent control unit 2 closes the normally closed electric control valve 12, and then opens the normally open electric control valve 10 to restore the digital gas density relay to the monitoring working state. In addition, if the pressure difference |P1 ₀ -0| ≥ the preset threshold, the intelligent control unit 2 can also correct the pressure signal collected by the pressure sensor 101 of the gas density detection sensor 1, so that the corrected P1 _{0 correction} meets the corresponding preset threshold. Set the threshold; if the pressure difference |P2 ₀ -0| ≥ the preset threshold, the intelligent control unit 2 can also compare and correct the pressure signal collected by the second pressure sensor 601 of the sensor 6, so that the corrected P20 _{correction is in} line with the corresponding Preset threshold. Specifically, when there is no zero pressure, the pressure signal collected by the pressure sensor 101 of the gas density detection sensor 1 and/or the second pressure sensor 601 of the comparison sensor 6 can be zeroed to restore the normal state.

In addition, in this embodiment, in real time or according to a preset time, the intelligent control unit 2 and/or the background can detect the first pressure value P1 and the first pressure value P1 collected by the pressure sensor 101 of the gas density detection sensor 1 under the same gas pressure. The second pressure value P2 collected by the second pressure sensor 601 of the comparison sensor 6 is compared to obtain the pressure difference |P1-P2|. If the pressure difference |P1-P2| is within its preset threshold, the digital The current working state of the gas density relay (or gas density monitoring device) is a normal working state, otherwise, it is an abnormal working state.

The intelligent control unit 2 and/or the background may also compare the ambient temperature value with the temperature value collected by the temperature sensor 102 of the gas density detection sensor 1 to complete the verification of the temperature sensor 102 of the gas density detection sensor 1. Specifically, the intelligent control unit 2 and/or the background monitors the first temperature value T1 and the ambient temperature value (the second temperature value TH) collected by the temperature sensor 102 of the gas density detection sensor 1 at the same gas temperature. Provided) perform comparison to obtain the temperature difference |T1-TH|, if the temperature difference |T1-TH| is within its preset threshold, the current working state of the digital gas density relay (or gas density monitoring device) is Normal working state, otherwise, it is abnormal working state.

Or, through the same substation in the background, the first temperature value T1A collected by the temperature sensor 102 of the gas density detection sensor 1 of the A device, and the first temperature value T1B collected by the temperature sensor 102 of the gas density detection sensor 1 of the B device , The first temperature value T1C collected by the temperature sensor 102 of the gas density detection sensor 1 of the C device, and so on. In the background, T1A, T1B, and T1C can be compared and diagnosed. If a certain temperature value deviates significantly, the current working state of the temperature sensor 102 of the gas density detection sensor 1 of the monitoring device is an abnormal working state; if it is basically close, it means The current working state of the digital gas density relay or the gas density monitoring device is the normal working state.

Embodiment three:

As shown in FIG. 5, the difference from the second embodiment is that in this embodiment, the comparison sensor 6 includes a second pressure sensor 601 and a second temperature sensor 602. In the gas path, the pressure sensor 101 of the gas density detection sensor 1 and the second pressure sensor 601 of the comparison sensor 6 are respectively connected to the multi-way connector 11.

Specifically, the pressure value collected by the pressure sensor 101 of the gas density detection sensor 1 is the first pressure value P1, and the temperature value collected by the temperature sensor 102 is the first temperature value T1; The pressure value is the second pressure value P2, and the temperature value collected by the second temperature sensor 602 is the second temperature value T2. Alternatively, the gas density value collected by the gas density detection sensor 1 is the first density value P1 ₂₀ , and the gas density value collected by the comparison sensor 6 is the second density value P2 ₂₀ .

The intelligent control unit 2 and/or the background can compare the first pressure value P1 with the second pressure value P2 under the same gas pressure to obtain the pressure difference |P1-P2|, and/or the intelligent control unit 2 And/or compare the first temperature value T1 with the second temperature value T2 at the same gas temperature in the background to obtain the temperature difference |T1-T2|; if the pressure difference |P1-P2| and/or the temperature difference |T1- If T2| is within its preset threshold, the current working state of the digital gas density relay (or gas density monitoring device) is the normal working state, otherwise, it is the abnormal working state. Alternatively, the intelligent control unit 2 and/or the background compares the first density value P1 ₂₀ with the second density value P2 ₂₀ to obtain the density difference |P1 ₂₀ -P2 ₂₀ |, if the density difference |P1 ₂₀ -P2 ₂₀ |Within its preset threshold, the current working state of the digital gas density relay (or gas density monitoring device) is a normal working state; otherwise, it is an abnormal working state.

As long as the detection data of the pressure sensor 101, the temperature sensor 102, the second pressure sensor 601, and the second temperature sensor 602 are consistent and normal, it means that the digital gas density relay itself is normal, so there is no need to use it. In the traditional way, maintenance personnel go to the site to verify the digital gas density relay, which can avoid manual verification for the whole life. Unless the detection data of the pressure sensor 101, temperature sensor 102, second pressure sensor 601, second temperature sensor 602, etc. of a certain electrical equipment in the substation is inconsistent or abnormal, the maintenance personnel will be arranged to deal with it. As for the coincident and normal ones, manual verification is not necessary. In this way, the reliability and work efficiency are greatly improved, and the cost is reduced. In addition, in the absence of zero pressure, the pressure signal collected by the pressure sensor 101 of the gas density detection sensor 1 and/or the pressure sensor 601 of the comparison sensor 6 can be zeroed to restore the normal state and prolong the service life. Or return to normal as soon as possible.

The intelligent control unit 2 and/or the background can also compare the ambient temperature value with the first temperature value collected by the temperature sensor 102 of the gas density detection sensor 1 to complete the calibration of the temperature sensor 102 of the gas density detection sensor 1 And compare the environmental temperature value with the second temperature value collected by the second temperature sensor 602 of the comparison sensor 6, to complete the verification of the second temperature sensor 602 of the comparison sensor 6. Specifically, the intelligent control unit 2 and/or the background monitors the first temperature value T1 and the ambient temperature value (the second temperature value TH) collected by the temperature sensor 102 of the gas density detection sensor 1 at the same gas temperature. Provided) Perform comparison to obtain the temperature difference |T1-TH|. If the temperature difference |T1-TH| is within its preset threshold, the current working state of the temperature sensor 102 of the gas density detection sensor 1 is the normal working state , Otherwise, it is abnormal working state. The intelligent control unit 2 and/or the background performs the second temperature value T2 and the ambient temperature value (the second temperature value TH, which can be provided by the background) collected by the second temperature sensor 602 of the comparison sensor 6 at the same gas temperature Compare to obtain the temperature difference |T2-TH|, if the temperature difference |T2-TH| is within its preset threshold, the current working state of the second temperature sensor 602 of the comparison sensor 6 is the normal working state, otherwise , Is an abnormal working state.

In addition, the gas density detection sensor 1 can also realize self-diagnosis of its own components. In a preferred embodiment, the gas density detection sensor 1 includes at least one pressure sensor and at least one temperature sensor. The pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are randomly arranged and combined, and each combination is converted into multiple pressure values corresponding to 20°C according to the gas pressure-temperature characteristics, that is, the gas density value, and each gas density value is performed Comparing to complete the self-diagnosis of each pressure sensor and each temperature sensor; or, the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor traverse all permutations and combinations, and convert each combination according to the gas pressure-temperature characteristics Become multiple pressure values corresponding to 20°C, that is, gas density values, compare each gas density value to complete the self-diagnosis of each pressure sensor and each temperature sensor; or combine multiple pressure sensors and temperature sensors. The gas density value, pressure value, and temperature value are compared to complete the self-diagnosis of each pressure sensor and each temperature sensor.

Through the above comparison, online self-checking, or zero-checking diagnosis, or comparison diagnosis of the digital gas density relay can be realized without maintenance, improving work efficiency, reducing costs, and ensuring the safe operation of the power grid.

The above-mentioned gas density detection sensor 1 may include a pressure sensor 101 and a temperature sensor 102; alternatively, a gas density transmitter composed of a pressure sensor and a temperature sensor can also be used; alternatively, gas density detection using quartz tuning fork technology can also be used sensor. The aforementioned comparison sensor 6 may include a second pressure sensor 601; or, may also include a second pressure sensor 601 and a second temperature sensor 602; or, may also be composed of a second pressure sensor and a second temperature sensor. The comparison gas density transmitter; alternatively, the second gas density detection sensor of quartz tuning fork technology can also be used.

In this embodiment, other working principles are the same as in the second embodiment, and will not be repeated here.

The type of the pressure sensor in this application can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number can be several. The pressure sensor can be in the form of a diffused silicon pressure sensor, MEMS pressure sensor, chip pressure sensor, coil induction pressure sensor (such as a pressure measurement sensor with an induction coil in a Baden tube), a resistance pressure sensor (such as a slip wire resistance with a Baden tube) The pressure measurement sensor) can be an analog pressure sensor or a digital pressure sensor. Pressure collection is a variety of pressure-sensitive components such as pressure sensors and pressure transmitters, such as diffused silicon type, sapphire type, piezoelectric type, strain gauge type (resistance strain gauge type, ceramic strain gauge type).

The temperature sensor in this application can be a thermocouple, a thermistor, or a semiconductor type; it can also be a contact type or a non-contact type; according to the sensor material and the characteristics of the electronic components, the temperature sensor can be a thermal resistance or a thermocouple. In short, temperature collection can use various temperature sensing elements such as temperature sensors and temperature transmitters.

The digital gas density relay in this application has the functions of pressure and temperature measurement and software conversion. On the premise of not affecting the safe operation of electrical equipment, the alarm and/or blocking contact action value and/or return value of the digital gas density relay can be detected online. Of course, the return value of the alarm and/or blocking contact signal can also be tested without testing.

The intelligent control unit 2 in this application mainly completes the control of the normally open electric control valve 10 and the normally closed electric control valve 12, signal collection, and control of the signal device 5. Of course, the intelligent control unit 2 can also realize: test data storage; and/or test data export; and/or test data can be printed; and/or host computer can perform data communication; and/or can input analog and digital information . Through the intelligent control unit 2, the digital gas density relay will automatically make a comparison and judgment. If the error is large, an abnormal prompt will be issued: the pressure sensor, temperature sensor, etc. of the digital gas density relay have problems, that is, the digital gas density relay It can complete the self-diagnosis function of its own pressure sensor, temperature sensor, or density transmitter. The intelligent control unit 2 can also automatically generate a comparison diagnosis report of the gas density relay. If there is an abnormality, it can automatically send an alarm or send it to a designated receiver, such as a mobile phone; and it can also be displayed on-site or through the background Display the gas density value and the comparison diagnosis result, the specific method can be set flexibly. Intelligent control unit 2 can also have real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and other functions; it can monitor gas density value, or density value, pressure value, temperature value online ; With self-diagnosis function, it can promptly notify abnormalities, such as disconnection, short circuit alarm, sensor damage, etc.; can compare the error performance of gas density relays at different temperatures and different time periods, that is, different periods, the same The comparison within the temperature range is used to determine the performance of the digital gas density relay; it has the comparison of each period of history, and the comparison between history and the present. The intelligent control unit 2 can also judge whether the gas density value of the digital gas density relay itself and the monitored electrical equipment is normal, that is, it can judge the gas density value of the electrical equipment itself, the pressure sensor, temperature sensor of the gas density relay itself, etc. Perform normal and abnormal judgment, analysis and comparison. The intelligent control unit 2 can also contain an analysis system (expert management analysis system) to detect, analyze and determine gas density monitoring, gas density relays, and monitoring components, and know where the problem is, whether it is the electrical equipment or the gas density relay itself. ; It also monitors the contact signal status of the gas density relay, and remotely transmits its status. You can know the contact signal status of the gas density relay in the background: whether it is open or closed, thereby adding a layer of monitoring to improve reliability . The intelligent control unit 2 can also detect, or detect and determine the contact resistance of the digital gas density relay; it has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on electrical equipment.

In summary, a digital gas density relay (or gas density monitoring device) with a self-diagnostic function has a self-diagnostic function and can perform self-diagnosis on each component. The digital gas density relay (or gas density monitoring device) with self-diagnosis function contains multiple pressure sensors and temperature sensors. The test data of multiple pressure sensors and the test data of multiple temperature sensors can be compared. diagnosis. The digital gas density relay (or gas density monitoring device) with self-diagnosis function can also compare the ambient temperature value with the sampling value of the temperature sensor to complete the calibration of the temperature sensor. This application realizes the online self-check or self-diagnosis of the digital gas density relay (or gas density monitoring device), improves work efficiency, does not require passive maintenance, reduces operation and maintenance costs, and ensures the safe operation of the power grid.

It should be noted that the digital gas density relay with self-diagnosis function described in this application generally refers to the design of its constituent elements into an integrated structure; while the gas density monitoring device generally refers to the design of its constituent elements in a body structure. Flexible composition. Gas temperature generally refers to the temperature in the gas, or the corresponding ambient temperature. The verification and diagnosis method in the present invention includes, but is not limited to, the corresponding difference is within its preset threshold, the detection value is within its set range, and the quotient of the division of two corresponding detection values is within its preset threshold. Any kind. In the self-diagnosis method, the comparison of the corresponding detection results can be completed by the intelligent control unit and/or the background, and the method can be flexible.

The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention should all fall within the scope of the present invention.

Claims

The digital gas density relay with self-diagnosis function is characterized by including: gas density detection sensor, intelligent control unit, annunciator, communication module, normally open electric control valve and normally closed electric control valve;

One end of the normally open electronic control valve is provided with an interface communicating with electrical equipment, the other end is connected to one end of the normally closed electronic control valve, and the other end of the normally closed electronic control valve is connected to air, and a gas density detection sensor Installed on the gas circuit between the normally open electronic control valve and the normally closed electronic control valve, used to collect the pressure value and temperature value, and/or the gas density value of the gas circuit between the normally open electronic control valve and the normally closed electronic control valve ；

The intelligent control unit is respectively connected with a gas density detection sensor, an annunciator, a communication module, a normally open electronic control valve, and a normally closed electronic control valve; the intelligent control unit is configured to obtain data collected by the gas density detection sensor The gas density value, or, the intelligent control unit is configured to obtain the pressure value and temperature value collected by the gas density detection sensor, and convert it into a gas density value according to the gas pressure-temperature characteristic; the intelligent control unit uploads it through the communication module One or more of the gas density value, pressure value, and temperature value is used to complete the online monitoring of the gas density of the monitored electrical equipment by the digital gas density relay; the intelligent control unit is also configured as a control annunciator, The annunciator outputs alarm and/or blocking contact signals, and controls the switching state of the normally open electric control valve and the normally closed electric control valve.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that the intelligent control unit controls the annunciator not to output alarm and/or lock contact signals during zero check diagnosis.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that: when the gas density value is lower than and/or higher than the preset threshold value, the intelligent control unit controls the signal The annunciator enables the annunciator to output an alarm and/or blocking contact signal, which is used to complete the monitoring of the gas density value in the electrical equipment.
The digital gas density relay with self-diagnosis function according to claim 1, wherein the gas density detection sensor includes a pressure sensor and a temperature sensor; or, the gas density detection sensor is a pressure sensor and a temperature sensor. A gas density transmitter composed of sensors; or, the gas density detection sensor is a density detection sensor using quartz tuning fork technology.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that it further comprises a multi-way connector, the normally open electric control valve, the gas density detection sensor, and the normally closed electric control valve They are respectively arranged on the multi-way joints; on the gas path, the other end of the normally open electric control valve is respectively connected with the gas density detection sensor and one end of the normally closed electric control valve through the multi-way joint.
The digital gas density relay with self-diagnostic function according to claim 5, characterized in that it further comprises a comparison sensor, the comparison sensor is also arranged on the multi-way connector, and the comparison sensor passes through the multi-way connector. Connect with the gas density detection sensor on the gas path;

Wherein, the comparison sensor includes a second pressure sensor; or, the comparison sensor includes a second pressure sensor and a second temperature sensor; or, the comparison sensor is a second pressure sensor and a second temperature sensor. A second gas density transmitter composed of sensors; or, the comparison sensor is a second density detection sensor using quartz tuning fork technology.
The digital gas density relay with self-diagnostic function according to claim 1, characterized in that: the annunciator includes one of electromagnetic relay, solid state relay, MOS FET relay, power relay, electronic switch, and thyristor .
The digital gas density relay with self-diagnosis function according to claim 1, wherein the digital gas density relay further comprises a filter, and the filter is connected to the other end of the normally closed electric control valve.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that: the digital gas density relay further comprises a protection circuit, and the protection circuit is arranged on the intelligent control unit or is connected to the intelligent control unit. Connected, the protection circuit includes one or more of a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, and an overvoltage protection circuit; and/or

The digital gas density relay further includes a short circuit and/or open circuit diagnostic circuit, which is configured to diagnose a circuit that has a short circuit and/or open circuit fault.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that: the digital gas density relay further comprises a heater and/or radiator connected to the intelligent control unit, and the temperature is lower than The intelligent control unit turns on the heater when the set value is set, or the intelligent control unit turns on the radiator when the temperature is higher than the set value.
The digital gas density relay with self-diagnosis function according to claim 1, characterized in that: at least two of the digital gas density relays with self-diagnosis function are connected to a remote background detection system through a communication module; wherein, The digital gas density relay is arranged on the electrical equipment corresponding to the gas chamber, and the communication mode of the communication module includes a wired communication mode and a wireless communication mode.
A self-diagnostic method for a digital gas density relay with self-diagnostic function according to claim 1, characterized in that it comprises:

The intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor, and converts it into a gas density value according to the gas pressure-temperature characteristics; the intelligent control unit passes The communication module uploads one or more of the gas density value, pressure value, and temperature value to complete the online monitoring of the gas density of the monitored electrical equipment by the digital gas density relay; when the gas density value is lower than and/ Or when it is higher than the preset threshold, the intelligent control unit controls the annunciator to make the annunciator output alarm and/or blocking contact signals to complete the monitoring of the gas density value in the electrical equipment;

The normally open electronic control valve is closed by the intelligent control unit, and the gas path between the electrical equipment and the gas density detection sensor and the normally closed electronic control valve is shut off, and then the normally closed electronic control valve is controlled to open by the intelligent control unit to make the gas density The detection sensor is connected with the air to realize the zero calibration diagnosis of the gas density detection sensor;

When the zero calibration diagnosis is completed, the intelligent control unit controls the normally closed electric control valve to close, and then controls the normally open electric control valve to open, so that the digital gas density relay returns to the monitoring working state.
The self-diagnostic method of a digital gas density relay with self-diagnostic function according to claim 12, characterized in that: the gas density detection sensor comprises a pressure sensor; when the normally open electronic control valve is in the closed state, that is, In the zero check diagnosis state, the intelligent control unit controls the normally closed electric control valve to open, and when the gas pressure of the gas path of the gas density detection sensor slowly drops to zero, the intelligent control unit receives the pressure of the gas density detection sensor The pressure signal P1 0 collected by the sensor, if the pressure difference |P1 0 -0| ≥ the preset threshold, the intelligent control unit sends out a signal and/or information that the zero deviation of the pressure sensor of the gas density detection sensor is abnormal.
The self-diagnostic method of a digital gas density relay with self-diagnosis function according to claim 12, wherein the digital gas density relay further comprises a comparison sensor, the comparison sensor and the gas density detection sensor, The normally open electric control valve and the normally closed electric control valve are connected on the gas path; the self-diagnosis method further includes:

In the zero check diagnosis, the pressure signal collected by the gas density detection sensor is the first pressure signal P1 0 , and the pressure signal collected by the comparison sensor is the second pressure signal P2 0 , and the intelligent control unit and/or the background A pressure signal P1 0 and/or a second pressure signal P2 0 are respectively compared with zero pressure; if the pressure difference |P1 0 -0| ≥ the preset threshold, the intelligent control unit performs a check on the pressure signal collected by the gas density detection sensor Correction so that the corrected first pressure signal P1 0 is smaller than the corresponding preset threshold; and/or, if the pressure difference |P2 0 -0|≥ the preset threshold, the intelligent control unit compares and corrects the pressure signal collected by the sensor a second pressure signal, the correction P2 0 repair less than a corresponding preset threshold.
The self-diagnostic method of a digital gas density relay with self-diagnosis function according to claim 12, wherein the digital gas density relay further comprises a comparison sensor, the comparison sensor and the gas density detection sensor, The normally open electric control valve and the normally closed electric control valve are connected on the gas path; the self-diagnosis method further includes:

The intelligent control unit compares and diagnoses the first pressure value P1 collected by the gas density detection sensor and the second pressure value P2 collected by the comparison sensor under the same gas pressure; and/or, the intelligent control unit compares and diagnoses the same gas The first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor under temperature are compared and diagnosed; or, the intelligent control unit performs comparison diagnosis on the first temperature value T1 collected by the gas density detection sensor under the same gas density. A density value P1 20 and a second density value P2 20 collected by the comparison sensor are compared and diagnosed to obtain the current working status of the digital gas density relay; or,

The intelligent control unit uploads the received data to the background through the communication module, and the background compares the first pressure value P1 collected by the gas density detection sensor with the second pressure value P2 collected by the comparison sensor under the same gas pressure Diagnosis; and/or, the background compares and diagnoses the first temperature value T1 collected by the gas density detection sensor and the second temperature value T2 collected by the comparison sensor at the same gas temperature; or, the background performs a comparison diagnosis on the same gas a first density value by the density of the collected gas density detection sensor P1 20 and the second sensor by the ratio of density values acquired P2 20 ratio for the diagnosis, obtain the current operating state of the digital relay gas density.
The self-diagnostic method of a digital gas density relay with self-diagnostic function according to claim 15, wherein the gas density detection sensor comprises a pressure sensor and a temperature sensor, and the comparison sensor comprises a second pressure sensor and The second temperature sensor; the pressure value collected by the pressure sensor of the gas density detection sensor is the first pressure value P1, the temperature value collected by the temperature sensor is the first temperature value T1; the pressure value collected by the second pressure sensor of the comparison sensor is the first Two pressure values P2, the temperature value collected by the second temperature sensor is the second temperature value T2; the self-diagnosis method further includes:

The intelligent control unit and/or background compares the first pressure value P1 with the second pressure value P2 under the same gas pressure to obtain the pressure difference |P1-P2|, and/or compare the first pressure value at the same gas temperature The temperature value T1 is compared with the second temperature value T2 to obtain the temperature difference |T1-T2|; if the pressure difference |P1-P2| and/or the temperature difference |T1-T2| are within their preset thresholds, then The current working state of the digital gas density relay is normal working state, otherwise, it is abnormal working state.
The self-diagnosis method of a digital gas density relay with self-diagnosis function according to claim 15, wherein the gas density detection sensor comprises a gas density detection sensor, and the comparison sensor comprises a second gas density detection sensor The gas density value collected by the gas density detection sensor is the first density value P1 20 , and the gas density value collected by the comparison sensor is the second density value P2 20 ; the self-diagnosis method further includes:

The intelligent control unit and/or background compares the first density value P1 20 with the second density value P2 20 under the same gas density to obtain the density difference |P1 20 -P2 20 |; if the density difference | P1 20- P2 20 | Within its preset threshold, the current working state of the digital gas density relay is a normal working state, otherwise, it is an abnormal working state.
The self-diagnostic method of a digital gas density relay with self-diagnosis function according to claim 12, wherein the digital gas density relay further comprises a comparison sensor, the comparison sensor and the gas density detection sensor, The normally open electric control valve and the normally closed electric control valve are connected on the gas path; the self-diagnosis method further includes:

The gas density detection sensor includes a temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the temperature sensor of the gas density detection sensor to complete the temperature sensor of the gas density detection sensor. Check; and/or,

The gas density detection sensor includes a temperature sensor, and the intelligent control unit and/or background compares the corresponding temperature values collected by the temperature sensors of the gas density detection sensors of different electrical equipment in the same substation to complete the gas density detection The calibration of the temperature sensor of the sensor; and/or,

The comparison sensor includes a second temperature sensor, and the intelligent control unit and/or background compares the ambient temperature value with the temperature value collected by the second temperature sensor of the comparison sensor to complete the comparison of the second temperature of the sensor Calibration of the sensor.
The self-diagnostic method of a digital gas density relay with self-diagnostic function according to claim 18, characterized in that it comprises: the collected temperature value is the first temperature value T1, the ambient temperature value is the second temperature value TH, so The intelligent control unit and/or the background compares the first temperature value T1 with the second temperature value TH to obtain the temperature difference |T1-TH|; if the temperature difference |T1-TH| is within its preset threshold, then The current working state of the digital gas density relay or gas density monitoring device is a normal working state, otherwise, it is an abnormal working state; wherein, the first temperature value T1 comes from the gas density detection sensor or comes from the comparison sensor .
The self-diagnosis method of a digital gas density relay with self-diagnosis function according to claim 12, wherein the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; the self-diagnosis method further comprises :

The pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are randomly arranged and combined, and each combination is converted into multiple pressure values corresponding to 20°C according to the gas pressure-temperature characteristics, that is, the gas density value, and each gas density value is performed Comparing to complete the self-diagnosis of each pressure sensor and each temperature sensor; or,

The pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor traverse all permutations and combinations, and convert each combination into multiple pressure values corresponding to 20°C according to the gas pressure-temperature characteristics, that is, the gas density value, and the density of each gas Compare the values to complete the self-diagnosis of each pressure sensor and each temperature sensor; or,

The multiple gas density values, pressure values, and temperature values obtained by each pressure sensor and each temperature sensor are compared to complete the self-diagnosis of each pressure sensor and each temperature sensor.