A gas density relay

Abstract

The present invention provides a gas density relay. A control processing unit generates a control signal to cause a contact signal unit to switch contacts, thereby switching the operating state of the gas density relay. Due to the structure of a displacement adjustment unit connected at one end to a signal trigger unit and at the other end to a pressure rod fixedly connected to a gas sealing unit, when the gas density value of the electrical equipment to be tested changes, the gas sealing unit generates an axial displacement, driving the pressure rod to move. The displacement stroke is amplified by the displacement adjustment unit, and a switching signal is generated by a signal trigger unit connected to the other end of the displacement adjustment unit and transmitted to the control processing unit. Based on the switching signal, an alarm signal and a contact locking signal are generated, thereby completing the calibration or normal operation of the gas density relay. The gas density relay can switch the operating state and perform self-calibration, reducing the cost of relay calibration.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, and more particularly, to a gas density relay. Background Art

[0002] With the continued rapid development of smart grids, smart high-voltage electrical equipment, as a crucial component and key node in smart substations, plays a crucial role in the security of smart grids. Currently, most high-voltage electrical equipment is SF6 gas-insulated. Currently, gas density relays with microswitch contacts are commonly used to monitor the density of the insulating gas in gas-insulated equipment. Regular inspection of gas density relays on electrical equipment is a necessary preventative measure to ensure the safe and reliable operation of electrical equipment. In actual operation, regular calibration of gas density relays is a necessary measure to ensure the safe and reliable operation of power equipment. However, current calibration of gas density relays requires the use of test personnel, equipment vehicles, and high-value SF6 gas, which is very expensive. Furthermore, improper on-site calibration by test personnel can pose safety risks. Therefore, the development of a self-calibrating gas density relay has become an urgent issue. Summary of the Invention

[0003] In order to solve the technical problems of potential safety hazards and high cost in on-site manual calibration of gas density relays in the prior art, the present invention provides a gas density relay that can achieve self-calibration of the gas density relay by switching the operating state.

[0004] According to one aspect of the present invention, the present invention provides a gas density relay, comprising:

[0005] A gas sensing unit, one end of which is connected to the electrical device under test and the other end of which is connected to the control processing unit, and is used to transmit the airflow of the electrical device under test to the control processing unit;

[0006] a gas sealing unit, located inside the gas sensing unit, for calibrating a standard gas density value using sealed supplementary gas, and for expanding or compressing according to the gas flow, thereby driving a pressure rod to move in an axial direction, wherein the standard gas density value is the gas density value when the electrical equipment to be tested is operating normally, and one end of the pressure rod is fixedly connected to the gas sealing unit;

[0007] a displacement adjustment unit, one end of which is fixedly connected to the other end of the pressure rod, and the other end of which is connected to the signal trigger unit, for transmitting the axial movement of the pressure rod to the signal trigger unit;

[0008] a signal triggering unit, configured to generate a switch signal according to the axial movement transmitted by the pressure rod, and transmit the switch signal to the control processing unit;

[0009] a contact signal unit, configured to perform contact switching according to a first control signal sent by a control processing unit to implement switching of an operating state of the gas density relay, wherein the operating state includes a verification state and a working state;

[0010] A control processing unit is used to generate the first control signal, obtain a temperature signal, obtain a pressure signal according to the airflow, calculate the gas density value of the electrical equipment to be tested according to the temperature signal, the pressure signal and the standard gas density value, and generate an alarm signal and a locking contact signal according to the switch signal.

[0011] The gas density relay of the present invention switches its operating state by sending a first control signal from a control processing unit to cause the contacts of a contact signal unit to switch. Regardless of whether the gas density relay is in an operating state or a calibration state, due to the structure in which one end of a displacement adjustment unit is connected to the control processing unit and the other end is connected to a pressure rod fixedly connected to a gas sealing unit, when the gas density value of the electrical device under test changes and reaches a set value, the first bellows of the gas sealing unit generates an axial displacement, driving the pressure rod to move. The displacement stroke is amplified by the displacement adjustment unit, and a switching signal is generated by a signal trigger unit connected to the other end of the displacement adjustment unit, thereby completing the calibration or normal operation of the gas density relay. When the gas density relay of the present invention performs self-calibration, the control processing unit within the gas density relay controls the switching of an electrically controlled valve connected to the electrical device under test and the pressure of a pressure regulating unit connected to the gas path of the gas density relay, thereby achieving self-calibration of the gas density relay, greatly reducing the time and effort required to calibrate the gas density relay and reducing calibration costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0013] Figure 1 A schematic structural diagram of a gas density relay according to a preferred embodiment of the present invention;

[0014] Figure 2 2 is a schematic structural diagram of a gas density relay according to a second preferred embodiment of the present invention;

[0015] Figure 3 2 is a schematic structural diagram of a shift adjustment unit according to a second preferred embodiment of the present invention;

[0016] FIG4( a ) is a schematic structural diagram of the upper stroke of the displacement adjustment unit according to the second preferred embodiment of the present invention;

[0017] FIG4( b ) is a schematic structural diagram of the lower stroke of the displacement adjustment unit according to the second preferred embodiment of the present invention;

[0018] Figure 5 A circuit schematic diagram of a contact signal unit in a working state according to a second preferred embodiment of the present invention;

[0019] Figure 6 A circuit schematic diagram of a contact signal unit in a verification state according to a second preferred embodiment of the present invention;

[0020] Figure 7 A schematic structural diagram of a gas density relay according to a third preferred embodiment of the present invention;

[0021] Figure 8 A schematic structural diagram of a gas density relay according to a fourth preferred embodiment of the present invention;

[0022] Figure 9 A schematic structural diagram of a device for self-calibrating a gas density relay according to a fourth preferred embodiment of the present invention;

[0023] Figure 10 The figure is a flow chart of a method for performing self-calibration on a gas density relay according to a fourth preferred embodiment of the present invention. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0025] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0026] Example Gas Density Relay

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of a gas density relay according to a preferred embodiment of the present invention. Figure 1As shown, the gas density relay described in this preferred embodiment includes:

[0028] A gas sensing unit 11, one end of which is connected to the electrical device under test and the other end of which is connected to the control processing unit 15, for transmitting the airflow of the electrical device under test to the control processing unit;

[0029] The gas sealing unit 12 is located inside the gas sensing unit 11 and is used to calibrate the standard gas density value using the sealed supplementary gas and expand or compress according to the gas flow, thereby driving the pressure rod 106 to move in the axial direction, wherein the standard gas density value is the gas density value when the electrical equipment to be tested is operating normally. One end of the pressure rod is fixedly connected to the gas sealing unit 12;

[0030] a displacement adjustment unit 13, one end of which is fixedly connected to the other end of the pressure rod 106, and the other end of which is connected to the signal trigger unit 14, for transmitting the axial movement of the pressure rod 106 to the signal trigger unit 14;

[0031] a signal triggering unit 14 for generating a switch signal according to the axial movement transmitted by the pressure rod 106 and transmitting the switch signal to the control processing unit 15;

[0032] a contact signal unit 6, configured to perform contact switching according to a first control signal sent by the control processing unit 15 to implement switching of an operating state of the gas density relay, wherein the operating state includes a verification state and a working state;

[0033] The control processing unit 15 is used to generate the first control signal, obtain the temperature signal, obtain the pressure signal according to the airflow, and calculate the gas density value of the electrical equipment to be tested according to the temperature signal, pressure signal and the standard gas density value, and generate an alarm signal and a locking contact signal according to the switch signal.

[0034] In this preferred embodiment, the gas sealing unit needs to be able to seal and replenish gas, and drive the pressure rod to move in the axial direction through expansion or compression. Therefore, it must be a material that is both sealable and has a certain degree of elasticity, such as a Baden tube or bellows. Since the gas sensing unit needs to transmit the change in gas density to the control processing unit after the electrical equipment under test leaks or after gas replenishment, it must be a sealed structure that can only communicate with the electrical equipment under test and the control processing unit. The displacement adjustment unit transmits the axial movement of the pressure rod to the signal triggering unit. As long as this principle is met, there is no limitation on the implementation method, and either electric or mechanical motion can be used.

[0035] Figure 2FIG. 1 is a schematic structural diagram of a gas density relay according to a second preferred embodiment of the present invention. Figure 2 , a structural diagram of the gas sensing unit 11, the gas sealing unit 12, the signal triggering unit 13, and the control processing unit 15 is described in detail.

[0036] Preferably, if Figure 2 As shown, the gas sensing unit 11 includes a first outer shell 102, a base 101, a sealing partition 107, a second bellows 104, a second gas pipe 10102, a third gas pipe 203 and a relay connector 8, wherein:

[0037] The inner side of the first outer shell 102 is sealed with the sealing partition 107. The sealing partition 107 divides the interior of the first outer shell 102 into an upper half and a lower half. The bottom of the first outer shell 102 is sealed with a base 101.

[0038] The gas sealing unit 12 is located in the lower half of the first outer shell 102 and is fixed on the base 101;

[0039] The first open end of the second bellows 104 is fixed to the sealing partition 107 , and the second open end of the second bellows 104 is sealedly connected to the middle portion of the pressure rod 106 ;

[0040] The lower half of the interior of the first outer shell 102, the gas sealing unit 12, the sealing partition 107 and the second bellows 104 together define a second sealed air chamber G2;

[0041] The second sealed air chamber G2 is connected to the relay connector 8 via a second air pipe 10102 provided on the base 101, and is sealedly connected to the electrical device to be tested via the relay connector 8;

[0042] The third air pipe 203 passes through the sealed partition 107 and the upper half of the first shell 102 in sequence and is connected to the control processing unit 14, so that the air flow of the electrical equipment under test passes through the second sealed air chamber G2 and is transferred to the control processing unit 104 through the third air pipe 203.

[0043] Preferably, if Figure 2 As shown, the gas sealing unit 12 includes a first bellows 103 and a sealing member 105, wherein:

[0044] The first open end of the first bellows 103 is fixed to the base 101 , and the second open end of the first bellows 103 is sealed to the sealing member 105 ;

[0045] The first bellows 103 and the sealing member 105 jointly define a first sealed air chamber G1;

[0046] The first sealed gas chamber G1 is sealed after the supplementary gas is injected, so that the gas density value in the first sealed gas chamber is the standard gas density value.

[0047] Preferably, the gas sealing unit 12 further includes a first gas pipe 10101 disposed at the first open end of the first bellows for injecting supplemental gas into the first sealed gas chamber. The provision of the first gas pipe facilitates the injection of varying amounts of supplemental gas and subsequent sealing when the gas density relay is used to measure electrical equipment with varying standard gas density values, without requiring disassembly of the first bellows and the seal, resulting in greater ease and convenience.

[0048] Figure 3 FIG. 1 is a schematic structural diagram of a displacement adjustment unit according to a second preferred embodiment of the present invention. Figure 3 As shown, the displacement adjustment unit 13 of this preferred embodiment includes a fixed subunit 131, a rotating subunit 132 and a moving subunit 133, wherein:

[0049] The fixing subunit 131 is used on the top of the gas sensing unit 11;

[0050] The moving subunit 133 passes through the fixed subunit 131 and is fixedly connected to the signal triggering unit 14;

[0051] Part of the rotating subunit 132 is hinged to the fixed subunit 131, and the other part is hinged to the moving subunit 133 and the pressure rod 106 respectively, so that when the pressure rod 106 moves in the axial direction, it drives the rotating subunit 132 to rotate, driving the moving subunit 133 to move in the axial direction.

[0052] Preferably, the fixed subunit 131 includes a bracket portion 1311, a rotating shaft 10905 and a fixing pin 10906, the rotating subunit 132 includes a first pull rod 10908, a second pull rod 10909 and a third pull rod 10910, and the moving subunit 133 includes a trigger shaft 10911, wherein:

[0053] Fix one end of the rotating shaft 10905 and the bracket portion 1311 to the top of the gas sensing unit 11 through the fixing pin 10906;

[0054] The bracket portion 1311 includes an upper clamping plate 10901 and a lower clamping plate 10902, a limiting plate 10903, and a bottom plate 10904. The upper clamping plate 10901 and the lower clamping plate 10902 are correspondingly assembled by a plurality of fixing pins 10906. The bottom plate 10904 and the limiting plate 10903 are disposed between the upper clamping plate 10901 and the lower clamping plate 10902 and are relatively fixed.

[0055] The other end of the rotating shaft 10905 is hinged to one end of the second pull rod 10909;

[0056] The other end of the second pull rod 10909 is hinged to one end of the third pull rod 10910;

[0057] One end of the first pull rod 10908 is hinged to the middle of the third pull rod 10910;

[0058] One end of the pressure rod 106 away from the gas sealing unit 12 is hinged to the other end of the first pull rod 10908, so that the pressure rod 106 moves in the axial direction;

[0059] One end of the trigger shaft 10911 is hinged to the other end of the third pull rod 10910 to achieve movement in the axial direction, wherein the other end of the trigger shaft passes through the limit plate 10903 and is fixedly connected to the lower part of the signal trigger rod of the signal trigger unit 14.

[0060] FIG4(a) is a schematic diagram of the structure of the displacement adjustment unit in the upper stroke according to the second preferred embodiment of the present invention. FIG4(b) is a schematic diagram of the structure of the displacement adjustment unit in the lower stroke according to the preferred embodiment of the present invention. As shown in FIG4(a) and FIG4(b), when airflow occurs in the electrical sensing unit 11, the gas sealing unit 12 expands or compresses due to the airflow in the gas sensing unit 11, generating axial displacement. The pressure rod 106 moves upward or downward, causing the displacement adjustment unit 13 to enter the upper stroke or lower stroke. The displacement transmitted by the pressure rod 106 is amplified by the displacement adjustment unit 13, causing the trigger shaft 10911 to move upward or downward, driving the signal trigger rod 114 connected thereto to move upward or downward accordingly, causing the button on the micro switch 113 to move away from the adjustment trigger member 116 and release, or the button to be squeezed and triggered by the adjustment trigger member 116, thereby causing the micro switch 113 to generate a corresponding switching signal, completing the function of the gas density relay.

[0061] Preferably, if Figure 2As shown, the signal trigger unit 14 includes a signal trigger rod 114, a fixing member 115, an adjustment trigger member 116 and a micro switch 113. The fixing member 115 is fixed to the upper part of the signal trigger rod 114, the adjustment trigger member 116 is fixed to the fixing member 115, and the lower part of the signal trigger rod 114 is fixedly connected to one end of the motion subunit 133;

[0062] The micro switch 113 is circumferentially distributed on the outer periphery of the middle part of the signal trigger rod 114. A button is set on the side of the micro switch 113 opposite to the adjustment trigger member 116. The button is electrically connected to the control processing unit 15. When the gas sensing unit 11 transmits the airflow of the electrical equipment to be tested to the control processing unit 15, the gas sealing unit 12 is compressed or expanded to generate axial displacement, which is transmitted through the displacement of the pressure rod 106 and amplified by the displacement adjustment unit, so that the lower part of the signal trigger rod 114 fixedly connected to the moving sub-unit 133 drives the adjustment trigger member 116 to displace. When the adjustment trigger member 116 squeezes or moves away from the button, a switch signal is generated and transmitted to the control processing unit 15.

[0063] Preferably, the contact signal unit 6 includes a first contact for an intermediate relay and a second contact controlled by the intermediate relay to be opened or closed.

[0064] Figure 5 FIG. 1 is a circuit diagram of a contact signal unit in a working state according to a second preferred embodiment of the present invention. Figure 5 As shown, the contact signal unit 6 is connected to the control subunit 7 and includes an intermediate relay J1, first contacts J11 and J12, and a second contact PJ. When the gas density relay according to this preferred embodiment is in operation, the control coil of the intermediate relay J1 is energized, and its contacts J1 and J2 are closed. At this time, the contact signal of the gas density relay is connected to the control circuit during normal operation.

[0065] Figure 6 FIG. 1 is a circuit diagram of a contact signal unit in a verification state according to a second preferred embodiment of the present invention. Figure 6As shown, when the gas density relay is in the working state, in order to switch the operating state from the working state to the verification state, the control subunit 7 controls the contact signal unit 6 to de-energize the control coil of its intermediate relay J1, disconnecting its contacts J11 and J12, thereby disconnecting the contact signal of the gas density relay from the contact signal control loop. At the same time, the contact PJ of the gas density relay is connected to the control subunit 7, thereby completing the transition of the gas density relay from the operating state to the verification state. When the gas density relay is in the verification state, the self-verification function can be achieved by the device for verifying the gas density relay of the present invention.

[0066] Preferably, the control processing unit 15 includes: a second outer shell 111 and a circuit board 112 located inside the second outer shell 111, a control subunit 7, a pressure sensor 2 and a temperature sensor 3, wherein:

[0067] The pressure sensor 2 is connected to the gas sensing unit 11 and is used to generate a pressure signal according to the airflow;

[0068] The temperature sensor 3 and the pressure sensor 2 are both connected to the circuit board 112 and are used to transmit the temperature signal and pressure signal collected by each to the control subunit 7;

[0069] The control subunit 7 is connected to the circuit board 112, and is used to calculate the gas density value of the electrical equipment to be tested based on the received temperature signal and pressure signal, and the standard gas density value, and to generate an alarm signal and a locking contact signal based on the switch signal.

[0070] Preferably, if Figure 2 As shown, the gas density relay further includes a guide member 110 , which is disposed at the bottom of the inner side of the second outer shell 111 . The signal trigger unit 14 passes through the guide member 110 and is fixedly connected to the displacement adjustment unit 14 .

[0071] like Figure 2 As shown, the lower portion of the signal trigger rod 114 passes through the center of the guide member 110 and is connected to the trigger shaft 10911 of the displacement adjustment unit 13, which penetrates the bottom of the inner side of the second outer shell 111. The provision of the guide member 110 ensures that the vertical movement of the signal trigger rod 114 and the trigger shaft 10911 remains in a straight line without deviation even when vibration occurs, thereby ensuring accurate displacement transmission.

[0072] In this preferred embodiment, after the control subunit 7 receives the temperature signal and the pressure signal, it uses the mathematical model of the relationship between gas pressure and temperature to calculate and process to obtain the gas density value. It can use the embedded algorithm and control program of the microprocessor-based embedded system such as general-purpose computers, industrial computers, CPUs, single-chip microcomputers, ARM chips, AI chips, quantum chips, photonic chips, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc. to automatically control the entire monitoring process, including all peripherals, logic and input and output.

[0073] Alternatively, the gas density relay can be a remote transmission relay that uploads gas density, temperature, and pressure values ​​via data communication. For example, the remote transmission relay can be connected to the substation's integrated automation online monitoring system via data communication methods such as RS-485, and transmit the information remotely to a central monitoring station at an unmanned station. Real-time monitoring is performed at both the local substation and a remote central monitoring station, enabling online monitoring of SF6 gas density in SF6 electrical equipment.

[0074] The gas density relay can realize long-distance transmission of test data and / or results and other information through data communication. The gas density relay can also include a clock to record the test time. The gas density relay can have the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like. When the gas density relay detects that the gas pressure has an increasing trend online, it can issue an abnormality notice in time. The gas density relay also has a protection function for the ambient temperature of electronic components to prevent them from working at too low or too high temperatures and make them work within the allowable temperature range. The gas density relay can also be provided with a heater and / or a radiator (such as a fan), and the heater is turned on at low temperature and the radiator is turned on at high temperature to ensure that electronic components such as pressure sensors and / or integrated circuits can work reliably in low or high temperature environments. The gas density relay can also have data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on electrical equipment and the gas density relay itself.

[0075] Preferably, the gas density relay further comprises a display portion 117 for displaying a digital indication of the gas density in the electrical equipment to be tested, wherein the display portion comprises a digital display screen 11701 , an indicator light 11702 and a display housing 11703 .

[0076] Preferably, the display portion 117 and the signal triggering unit 14 can be separate or integrated.

[0077] Figure 7 FIG. 1 is a schematic structural diagram of a gas density relay according to a third preferred embodiment of the present invention. Figure 7As shown, the gas density relay 200 includes a display portion 117 separated from the second housing 111. The display portion 117 and the second housing 117 communicate with each other via a data line.

[0078] Figure 8 FIG. 1 is a schematic structural diagram of a gas density relay according to a fourth preferred embodiment of the present invention. Figure 8 As shown, the gas density relay 300 includes a display portion 117 integrated with the signal trigger module 118. The bottom of the display housing 11703 of the display portion 117 is tightly fitted with the top of the second housing 111.

[0079] In this preferred embodiment, by using the display part 117, the gas density relay of the present invention also has a human-computer interaction function, which not only has a data display interface that can refresh the current data value in real time, but also has a data input function that can input parameter setting values.

[0080] In addition, the gas density relay may also have the following functional structure:

[0081] 1. The electrical interface can be equipped with a protection function, so that misconnection will not cause damage to the interface;

[0082] 2. The gas density relay further comprises a plurality of transition pieces, wherein the first open end of the second bellows is fixed to the sealing partition through the transition piece, and / or the second open end of the second bellows is sealedly connected to the middle portion of the pressure rod through the transition piece;

[0083] 3. The gas density relay also includes a temperature-sensing package, which is a sealed cavity with good thermal conductivity and serves as an extension cavity of the first sealed gas chamber for setting the compensation gas; the temperature-sensing package can increase the amount of compensation gas and improve the compensation accuracy, and can also be used as a sealed cavity for external compensation gas and set at a location where temperature collection is required.

[0084] In summary, the gas density relay described in this preferred embodiment can realize the switching of the operating state through the contact signal unit, which can not only measure and alarm the gas density value of the electrical equipment to be tested, but also perform self-inspection, which greatly reduces the cost of self-inspection; further, through the displacement stroke amplification effect of the displacement adjustment unit, the accuracy of the signal triggering is greatly improved. At the same time, through the guide part, the separated outer shells each fix the corresponding parts, and then the sealed connection and other structures, the vibration resistance of the gas density relay is improved, thereby improving the stability and reliability of the gas density relay.

[0085] Figure 9 FIG. 1 is a schematic diagram of a self-calibration device for a gas density relay according to a fourth preferred embodiment of the present invention. Figure 9As shown, the device for self-calibration of the gas density relay 300 according to the fourth preferred embodiment of the present invention includes: a pressure regulating unit 5, an electric control valve 4 and a multi-way connector 9, wherein:

[0086] The gas density relay 300 is connected to the first port of the multi-way connector 9 via the relay connector 8;

[0087] One end of the electric control valve 4 is connected to the second port of the multi-way connector 9, and the other end is fixed to the air inlet 10 of the electrical equipment to be tested;

[0088] The pressure regulating unit 5 is connected to the third port of the multi-way connector 9;

[0089] The control unit 7 is further configured to generate a second control signal to control the pressure regulating unit 5 , and generate a third control signal to control the switching of the electric control valve 4 .

[0090] It should be noted that, the preferred embodiment adopts the gas density relay 300 as an example, but in fact, any gas density relay protected by the present invention can be substituted as the gas density relay 300 .

[0091] The pressure regulating unit 5 includes a third air chamber 501 and a heating component 502 , and the gas pressure value of the third air chamber 501 is regulated by heating of the heating component 502 .

[0092] Figure 10 FIG. 4 is a flow chart of a method for self-testing a gas density relay according to a fourth preferred embodiment of the present invention. Figure 10 As shown, the method for performing self-calibration on the gas density relay 300 according to the fourth preferred embodiment starts from step 1001 .

[0093] In step 1001, the electrically controlled valve is closed to cut off the gas path between the electrical device to be tested and the gas density relay, and the operating state of the gas density relay is switched to a verification state.

[0094] In this preferred embodiment, the control subunit sends a second control signal to close the electric control valve to cut off the gas path between the electrical equipment to be tested and the gas density relay; the control subunit sends a first control signal to the contact signal unit to switch the operating state of the gas density relay to the verification state.

[0095] In step 1002, the first alarm function and the locking contact action function of the gas density relay are verified by increasing the pressure through a pressure regulating unit and then gradually reducing the pressure.

[0096] In this preferred embodiment, the control subunit sends a third control signal to the pressure regulating unit to increase the pressure of the pressure regulating unit; the control subunit then sends a third control signal to gradually reduce the pressure of the pressure regulating unit, triggering the gas density relay to generate a first alarm and a locking contact action; the control subunit then calculates the gas density value of the gas density relay at the time of the first alarm and contact action based on the first alarm signal and the locking contact action signal transmitted by the contact signal unit as the locking contact signal action value of the gas density relay;

[0097] In step 1003, the pressure is gradually increased by the pressure regulating unit to verify the second alarm function and the locking contact reset function of the gas density relay.

[0098] In this preferred embodiment, the control subunit sends a third control signal to the pressure regulating unit, causing the pressure of the pressure regulating unit to gradually increase, triggering the gas density relay to generate a second alarm and reset the locking contact; then the control subunit calculates the gas density value of the gas density relay at the time of the second alarm and the locking contact reset based on the second alarm signal and the locking contact reset signal transmitted by the contact signal unit as the locking contact signal return value of the gas density relay.

[0099] After the self-test of the gas density relay of the present invention is completed, when it is necessary to switch to the working state, the control subunit can send a second control signal to open the electric control valve to connect the gas path between the electrical equipment to be tested and the gas density relay, and send a first control signal to the contact signal unit to switch the operating state of the gas density relay from the verification state to the working state.

[0100] In this preferred embodiment, after the gas density relay is switched to the verification state, the control subunit 7 controls the pressure regulating unit 5 by sending a third control signal, so that the temperature of the pressure regulating unit 5 increases and the pressure increases under the action of the heating component 502, or the heating component 502 stops heating, the temperature drops, and the pressure decreases, thereby changing the pressure of the third gas chamber 501, adjusting the gas pressure of the gas density relay, and promoting the gas density relay to generate the first alarm, the locking contact signal action, the second alarm, and the locking contact signal reset, etc. to complete the verification of the contact signal action value / contact signal return value of the gas density relay. When all the contact signal verification work is completed, the control subunit 7 controls the electric control valve 4 to open, so that the gas density relay and the gas path of the electrical equipment to be tested are interconnected, and the contact signal unit 6 is adjusted to the working state. At this time, Figure 5As shown, the control subunit 7 controls the contact signal unit 6, so that the control coil of the intermediate relay J1 of the contact signal unit 6 is energized, and its contacts J11 and J12 are closed, so that the contact signal of the gas density relay is connected to the control circuit of the contact signal, and the control circuit of the contact signal of the gas density relay resumes normal working state.

[0101] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0102] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / the [means, component, etc.]" are to be interpreted openly as referring to at least one instance of the means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0103] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0104] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0105] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A gas density relay, characterized in that: The gas density relay comprises: A gas sensing unit, one end of which is connected to the electrical device under test and the other end of which is connected to the control processing unit, is used to transmit the airflow of the electrical device under test to the control processing unit. The gas sensing unit includes a first outer shell, a base, a sealing partition, a second bellows, a second air pipe, a third air pipe, and a relay connector, wherein: The inner side of the first outer shell is sealed with the sealing partition, and the interior of the first outer shell is divided into an upper half and a lower half by the sealing partition, and the bottom of the first outer shell is sealed with a base; The gas sealing unit is located in the lower half of the first outer shell and is fixed to the base; The first open end of the second bellows is fixed to the sealing partition, and the second open end of the second bellows is sealedly connected to the middle part of the pressure rod; The lower half of the interior of the first outer shell, the gas sealing unit, the sealing partition and the second bellows together define a second sealed air chamber; The second sealed air chamber is in communication with the relay connector via a second air pipe provided on the base, and is in sealed communication with the electrical device to be tested via the relay connector; The third air pipe passes through the sealed partition and the upper half of the first outer shell in sequence and is connected to the control processing unit, so as to pass the air flow of the electrical equipment under test through the second sealed air chamber and then to the control processing unit through the third air pipe; The gas sealing unit is located inside the gas sensing unit and is used to calibrate the standard gas density value using the sealed supplementary gas, and to expand or compress according to the gas flow, thereby driving the pressure rod to move in the axial direction. The standard gas density value is the gas density value when the electrical equipment to be tested is operating normally. One end of the pressure rod is fixedly connected to the gas sealing unit. The gas sealing unit includes a first bellows and a sealing member, wherein: The first open end of the first bellows is fixed to the base, and the second open end of the first bellows is sealedly connected to the sealing member; The first bellows and the sealing member jointly define a first sealed air chamber; The first sealed air chamber is sealed after the supplementary gas is injected, so that the gas density in the first sealed air chamber is a standard gas density value; A displacement adjustment unit, one end of which is fixedly connected to the other end of the pressure rod and the other end of which is connected to the signal trigger unit, is used to transmit the axial movement of the pressure rod to the signal trigger unit. The displacement adjustment unit includes a fixed subunit, a rotating subunit and a moving subunit, wherein: The fixing subunit is used to be fixed on the top of the gas sensing unit; The moving subunit is fixedly connected to the signal triggering unit through the fixed subunit; The rotating subunit is partially hinged to the fixed subunit, and the other part is respectively hinged to the moving subunit and the pressure rod, so that when the pressure rod moves in the axial direction, the rotating subunit is driven to rotate, thereby driving the moving subunit to move in the axial direction; a signal triggering unit, configured to generate a switch signal according to the axial movement transmitted by the pressure rod, and transmit the switch signal to the control processing unit; a contact signal unit, configured to perform contact switching according to a first control signal sent by a control processing unit to implement switching of an operating state of the gas density relay, wherein the operating state includes a verification state and a working state; A control processing unit is used to generate the first control signal, obtain a temperature signal, obtain a pressure signal according to the airflow, calculate the gas density value of the electrical equipment to be tested according to the temperature signal, the pressure signal and the standard gas density value, and generate an alarm signal and a locking contact signal according to the switch signal.

2. The gas density relay according to claim 1, characterized in that: The gas sealing unit further includes a first gas pipe provided at a first open end of the first bellows, for injecting supplementary gas into the first sealed gas chamber.

3. The gas density relay according to claim 1, characterized in that: The fixed subunit includes a bracket portion, a rotating shaft and a fixing pin, the rotating subunit includes a first pull rod, a second pull rod and a third pull rod, and the moving subunit includes a trigger shaft, wherein: Fixing one end of the rotating shaft and the bracket portion to the top of the gas sensing unit through a fixing pin; The other end of the rotating shaft is hinged to one end of the second pull rod; The other end of the second pull rod is hinged to one end of the third pull rod; One end of the first pull rod is hinged to the middle of the third pull rod; One end of the pressure rod away from the gas sealing unit is hinged to the other end of the first pull rod, so that the pressure rod moves in the axial direction; One end of the trigger shaft is hinged to the other end of the third pull rod to achieve movement in the axial direction, wherein the other end of the trigger shaft passes through the bracket part and is fixedly connected to the signal trigger unit.

4. The gas density relay according to claim 1, characterized in that: The signal trigger unit includes a signal trigger rod, a fixing member, an adjustment trigger member and a micro switch, wherein: The fixing member is fixed to the upper portion of the signal trigger rod, the adjustment trigger member is fixed to the fixing member, and the lower portion of the signal trigger rod is fixedly connected to one end of the motion subunit; The micro switches are circumferentially distributed on the outer periphery of the middle part of the signal trigger rod. A button is provided on the side of the micro switch opposite to the adjustment trigger member. The button is electrically connected to the control processing unit. When the gas sensing unit transmits the airflow of the electrical equipment to be tested to the control processing unit, the gas sealing unit is compressed or expanded to generate axial displacement, which is transmitted through the displacement of the pressure rod and amplified by the displacement adjustment unit, so that the lower part of the signal trigger rod fixedly connected to the motion subunit drives the adjustment trigger member to displace. When the adjustment trigger member squeezes or moves away from the button, a switch signal is generated and transmitted to the control processing unit.

5. The gas density relay according to claim 1, characterized in that: The contact signal unit includes an intermediate relay, a first contact whose opening and closing is controlled by the intermediate relay, and a second contact.

6. The gas density relay according to claim 1, characterized in that: The control processing unit includes: a second outer shell and a circuit board located inside the second outer shell, a control subunit, a pressure sensor, and a temperature sensor, wherein: The pressure sensor is connected to the gas sensing unit and is used to generate a pressure signal according to the airflow; The temperature sensor and the pressure sensor are both connected to the circuit board, and are used to transmit the temperature signal and pressure signal collected by each to the control subunit; The control subunit is connected to the circuit board, and is used to calculate the gas density value of the electrical equipment to be tested based on the received temperature signal and pressure signal, and the standard gas density value, and to generate an alarm signal and a locking contact signal based on the switch signal.

7. The gas density relay according to claim 1, characterized in that: The gas density relay further includes a guide member, and the signal triggering unit is fixedly connected to the displacement adjustment unit after passing through the guide member.

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