A gas density relay calibration method based on monitoring device

Abstract

The present invention discloses a gas density relay calibration method based on a monitoring device, wherein the monitoring device comprises a signal acquisition intelligent control unit and a pressure regulating mechanism, wherein the pressure regulating mechanism comprises a shell, a pressurizing device and a plugging mechanism; the shell constitutes a sealed cavity, and the pressurizing device and the plugging mechanism are located in the sealed cavity; the gas density relay calibration method comprises: when the connecting pipeline between the sealed cavity and the electrical equipment is closed and the sealed cavity and the gas density relay are connected, the gas density relay is calibrated down and up; the in-situ calibration of the gas density relay is realized by the method of the present invention, thereby ensuring that the gas in the gas density relay will not leak, thereby ensuring the safe operation of the power grid.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power and relates to a calibration method for a gas density relay. In particular, the method can be applied to upgrading and reconstructing density relays in existing substations. Background Art

[0002] With the continuous and vigorous development of smart grids, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a vital role in the safety of smart grids. At present, most high-voltage electrical equipment is SF6 gas-insulated equipment. If the gas density is reduced (such as caused by leakage, etc.), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. Therefore, regular inspection of SF6 gas density relays on SF6 electrical equipment is a necessary measure to ensure the safe and reliable operation of SF6 electrical equipment.

[0003] At present, the calibration of SF6 gas density relays has been highly valued and popularized in the power system. All power supply companies, power plants, and large factories and mines have implemented it. In order to complete the on-site calibration and inspection of density relays, power supply companies, power plants, and large factories and mines need to be equipped with testers, equipment vehicles, and high-value SF6 gas. Including the power outage business losses during the inspection, a rough calculation shows that the annual testing costs of each high-voltage switch station are tens of thousands to hundreds of thousands of yuan; in addition, if the on-site calibration of the inspectors is not standardized, there are safety hazards.

[0004] Therefore, it is very important to automatically calibrate the gas density relay of an existing substation (i.e., an already built substation) and complete online monitoring of gas density. That is, how to provide a method for calibrating a gas density relay for an already operating substation has become a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the prior art and disclose a gas density relay calibration method based on a monitoring device. The in-situ calibration of the gas density relay is realized through the method of the present invention, ensuring that the gas in the gas density relay will not leak, thereby ensuring the safe operation of the power grid.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] A gas density relay calibration method based on a monitoring device, the monitoring device includes a signal acquisition intelligent control unit and a pressure regulating mechanism, wherein the pressure regulating mechanism includes a shell, a boosting device and a plugging mechanism; the shell constitutes a sealed cavity, and the boosting device and the plugging mechanism are located in the sealed cavity; the gas density relay calibration method is: when the connecting pipeline between the sealed cavity and the electrical equipment is closed and the sealed cavity and the gas density relay are connected, the gas density relay is subjected to a downstroke calibration and an upstroke calibration; wherein the downstroke calibration includes: the boosting device drives the gas in the sealed cavity to be compressed into the cavity of the plugging mechanism, so that the air pressure in the sealed cavity decreases, and the gas density relay is subjected to a downstroke calibration and an upstroke calibration in the sealed cavity. During the pressure reduction process, the signal acquisition intelligent control unit collects and records the corresponding pressure and temperature values ​​in the sealed cavity when each contact of the gas density relay is triggered, as the downstroke action verification value of the gas density relay, and draws the downstroke verification conclusion by comparing and analyzing with the corresponding standard values; the upstroke verification includes: after the downstroke verification is completed, the gas in the cavity of the sealing mechanism is released to flow into the sealed cavity, so that the air pressure in the sealed cavity rises. During the pressurization process of the sealed cavity, the signal acquisition intelligent control unit collects and records the corresponding pressure and temperature values ​​in the sealed cavity when each contact of the gas density relay is triggered, as the upstroke action verification value of the gas density relay, and draws the upstroke verification conclusion by comparing and analyzing with the corresponding standard values.

[0008] According to a preferred embodiment, the sealed cavity is arranged on the pipeline between the gas density relay to be measured and the electrical equipment; the air inlet end of the boosting equipment is connected to the sealed cavity, and the air outlet end of the boosting equipment is connected to the inner cavity of the blocking mechanism through a connecting pipeline.

[0009] According to a preferred embodiment, a flow control valve and a check valve are sequentially provided on the connecting pipeline in the direction from the boosting device to the blocking mechanism.

[0010] According to a preferred embodiment, the blocking mechanism is provided with an elastic sealing element and an exhaust mechanism, one end of the blocking mechanism is fixed on the shell, and the other end selectively closes or opens the connecting pipeline between the sealing cavity and the electrical equipment through the elastic sealing element.

[0011] According to a preferred embodiment, the pressure regulating mechanism further comprises an elastic element, and the elastic element enables the elastic sealing element to have a tendency to open a connecting pipeline between the sealing cavity and the electrical device.

[0012] According to a preferred embodiment, a sensor is also provided on the blocking mechanism.

[0013] According to a preferred embodiment, the blocking mechanism is a corrugated spring mechanism.

[0014] According to a preferred embodiment, a pressure sensor and a temperature sensor are provided in the signal acquisition and intelligent control unit; the signal acquisition and intelligent control unit is connected to the sealed cavity to realize the gas pressure and temperature data collection in the sealed cavity and complete the control of various functional components in the pressure regulating mechanism.

[0015] According to a preferred embodiment, the signal acquisition intelligent control unit is connected to the gas density relay via a signal line to complete the acquisition of the contact status data inside the gas density relay.

[0016] The aforementioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the present invention. After understanding the scheme of the present invention, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present invention, and they are not exhaustively listed here.

[0017] Beneficial effects of the present invention:

[0018] When the method of the present invention is used for online verification, the device can be turned on through the background or control unit. After the boosting device in the pressure regulating mechanism is started, the gas is compressed toward the blocking mechanism, so that its expansion moves to cut off the connection between the electrical equipment and the gas density relay gas path. The boosting device continues to compress the gas toward the spring bellows mechanism, so that the pressure at the gas density relay end drops to the contact action value after the downstroke verification is completed, and the boosting device stops working. The exhaust mechanism on the blocking mechanism discharges gas outside the blocking mechanism, so that the pressure at the gas density relay end rises to the contact value after the upstroke verification is completed, and the blocking mechanism continues to exhaust gas outside the bellows until the cavity pressure in the blocking mechanism is balanced with the gas pressure in the sealed cavity, and the spring mechanism automatically pops open the blocking mechanism, so that the gas path of the density relay body returns to the device, and the connection between the electrical equipment and the gas density relay body gas path can be restored. The benefits of the device mainly include: the body is shut down inside a sealed cavity during the entire verification process, the gas pressure rises and falls, and SF6 gas will not leak to the atmospheric environment, so that the density relay running on site can be verified without leakage online. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the monitoring device of the gas density relay in the embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the electrical principle of the monitoring device of the gas density relay in the embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the working state structure of the pressure regulating mechanism of Example 3 in the self-checking intelligent gas density monitoring device;

[0022] Figure 4 It is a schematic diagram of the state structure of the pressure regulating mechanism of Example 3 after the gas density relay of the self-checking intelligent gas density monitoring device is turned off;

[0023] Figure 5 This is a schematic structural diagram of the pressure regulating mechanism of Example 3 in the positive stroke calibration state of the self-calibrating intelligent gas density monitoring device;

[0024] Figure 6 It is a schematic diagram of the gas circuit state structure of the pressure regulating mechanism of Example 3 during the reverse stroke verification of the self-verifying intelligent gas density monitoring device to open the gas density relay;

[0025] Among them, 1-gas density relay, 2-signal line, 3-signal acquisition intelligent control unit, 4-pressure regulating mechanism, 401-housing, 402-sealing element, 403-fixing part, 404-boosting equipment, 4041-connecting pipeline, 4042-flow control valve, 4043-check valve, 405-blocking mechanism, 405A-elastic sealing element, 406-exhaust mechanism, 407-sensor, 408-elastic element, 409-sealing cavity, 5-multi-way connector, 6-electrical equipment. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the present invention should be pointed out that, in the present invention, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present invention are all known by those skilled in the art on the basis of the prior art without creative work.

[0032] Embodiment 1:

[0033] refer to Figure 1 , 2 As shown, this embodiment discloses a monitoring device for a gas density relay, and the monitoring device includes: a signal acquisition intelligent control unit 3 and a pressure regulating mechanism 4.

[0034] The pressure regulating mechanism 4 is arranged on the pipeline between the gas density relay 1 to be tested and the electrical equipment 6, and is used to cut off the connection between the electrical equipment 6 and the gas density relay 1 during calibration. The pressure regulating mechanism 4 is also used to increase and decrease the gas pressure during the calibration of the gas density relay 1, and is used together with the signal acquisition intelligent control unit 3 to achieve the purpose of calibrating the various contacts (alarm and / or locking contacts) of the gas density relay 1.

[0035] The signal acquisition intelligent control unit 3 includes a pressure sensor, a temperature sensor and (or) a gas density sensor, which is used to collect pressure, temperature and (or) density signals in the gas passage. The signal acquisition intelligent control unit 3 also includes two functions: one is to monitor the gas density, temperature, pressure and other parameters of the electrical equipment 6 online when it is not in the calibration state (when the gas density relay 1 is working normally), and transmit the relevant data to the background; the other is to control the signal on and off or switch between the contact of the gas density relay 1 and the monitoring circuit of the density relay when calibrating the gas density relay 1, and control the pressure regulating mechanism 4 to cut off the gas path connection between the electrical equipment 6 and the density relay body 1, and increase or decrease the gas pressure of the density relay body 1, and complete the online calibration of the density relay according to the software algorithm of the control unit in the signal acquisition intelligent control unit 3. The signal acquisition intelligent control unit 3 is connected to the gas density relay 1 through a signal line 2.

[0036] from Figure 2 It can be known that in this embodiment, the signal acquisition intelligent control unit 3 controls the signal on / off or switching between the contact of the gas density relay 1 and the monitoring circuit of the density relay through the intermediate relay K1. Specifically, when calibrating the gas density relay 1, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to disconnect the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal between the contacts of the gas density relay 1 and the monitoring circuit of the density relay is disconnected, and the density relay 1 can be calibrated online; and after the calibration, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to close the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal between the contacts of the gas density relay 1 and the monitoring circuit of the density relay is connected, so that the density relay 1 can monitor the gas density of the electrical equipment 6 to ensure the reliable operation of the electrical equipment 6, that is, in the non-calibration state (when the gas density relay 1 is working normally), the gas density relay 1 is used to monitor the gas density in the gas chamber of the electrical equipment 6. When the gas pressure in the gas chamber of the electrical equipment 6 reaches the alarm / lockout value, it will trigger the signal conduction between the contacts and the monitoring circuit of the density relay, and send an alarm or lockout signal to the background or secondary equipment through the monitoring circuit of the density relay.

[0037] Specifically, the pressure regulating mechanism 4 includes a housing 401 , a pressurizing device 404 and a blocking mechanism 405 .

[0038] In this embodiment, the housing 401 constitutes a sealed cavity 409 , the boosting device 404 and the blocking mechanism 405 are located in the sealed cavity, and the sealed cavity 409 is arranged on the pipeline between the gas density relay 1 to be measured and the electrical device 6 .

[0039] The air inlet of the booster device 404 is connected to the sealed cavity 409, and the air outlet of the booster device 404 is connected to the inner cavity of the blocking mechanism 405 via the connecting pipeline 4041. The booster device 404 can include, but is not limited to, a booster pump, an air pump, and the like.

[0040] Furthermore, a flow control valve 4042 and a check valve 4043 are sequentially provided on the connecting pipeline 4041 in the direction from the boosting device 404 to the blocking mechanism 405 .

[0041] The plugging mechanism 405 is provided with an elastic sealing element 405A and an exhaust mechanism 406. One end of the plugging mechanism 405 is fixed on the housing 401, and the other end thereof selectively closes or opens the connection pipeline between the sealed cavity 409 and the electrical device 6 through the elastic sealing element 405A. The driving force for closing the corresponding pipeline of the elastic sealing element 405A on the plugging mechanism 405 is provided by the high-pressure gas input by the booster device 404.

[0042] Furthermore, the pressure regulating mechanism 4 further comprises an elastic element 408. The elastic element 408 makes the elastic sealing element 405A have a tendency to open the connecting pipeline between the sealing cavity 409 and the electrical device 6. That is, the elastic force provided by the elastic element 408 makes the elastic sealing element 405A no longer complete the sealing of the corresponding connecting pipeline.

[0043] Preferably, a sensor 407 is also provided on the blocking mechanism 405. The blocking mechanism 405 is a corrugated spring mechanism.

[0044] Preferably, the signal acquisition intelligent control unit 3 is connected to the sealed cavity 409 to realize the gas pressure and temperature data acquisition in the sealed cavity 409 and complete the control of each functional component in the pressure regulating mechanism 4. And the signal acquisition intelligent control unit 3 is connected to the gas density relay 1 to be measured to complete the acquisition of the contact state data in the gas density relay 1.

[0045] When the gas density relay 1 is calibrated online, the blocking mechanism 405 in the pressure regulating mechanism 4 is used to seal the connecting pipeline between the sealed cavity 409 and the electrical device 6. That is, the gas path of the gas density relay 1 and the electrical device 6 is cut off, and the pressure regulating mechanism 4 and the gas path inside the gas density relay 1 form a sealed gas chamber, and the pressure regulating mechanism 4 can easily adjust the pressure of the sealed gas chamber. During the pressure regulation process of the pressure regulating mechanism 4, the gas pressure inside the electrical device 6 will not be affected in any way; there will be no gas leakage to the outside, and during the calibration of the gas density relay 1, the electrical device 6 does not need to be powered off and can work normally.

[0046] Example 2

[0047] refer to Figure 1 and Figure 2 Based on Example 1, the detection device of the present invention also includes a multi-way connector 5.

[0048] In this embodiment, the housing 401 is fixed to the side wall of the multi-way connector 5 via the fixing member 403, and a sealing element 402 is provided between the housing 401 and the side wall of the multi-way connector 5. Thus, the housing 401 and the multi-way connector 5 form a sealed cavity 409.

[0049] The gas density relay 1 and the signal acquisition intelligent control unit 3 are respectively connected to the sealed cavity 409 via the pipeline in the multi-way connector 5. The electrical device 6 is connected to the sealed cavity 409 via the pipeline in the multi-way connector 5.

[0050] Example 3

[0051] refer to Figure 3 , 4 , 5, 6, based on Example 1 or Example 2, this embodiment discloses a gas density relay calibration method based on a monitoring device.

[0052] To verify that the gas density relay 1 is in operation, perform the following operations:

[0053] First, the pressure and temperature values ​​of the gas chamber of the electrical equipment 6 are collected in real time through the signal acquisition intelligent control unit 3, and the conclusion that the verification is allowed is obtained by comparing and analyzing with the corresponding preset threshold value that allows verification. Under the premise of allowing verification, it is necessary to avoid the contacts triggered during the verification process from sending false alarm signals to the background. Therefore, before the formal verification of the gas density relay 1, the signal acquisition intelligent control unit 3 needs to cut off the signal connection between the gas density relay 1 and the background system, and keep the signal state of the background system consistent with the signal state before the verification; specifically, from Figure 2It can be known that in this embodiment, the signal acquisition intelligent control unit 3 issues an instruction to control the signal on and off between the contacts of the gas density relay 1 and the monitoring circuit of the density relay through the intermediate relay K1. That is, when the gas density relay 1 can be allowed to be checked online, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to disconnect the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal between the contacts of the gas density relay 1 and the monitoring circuit of the density relay is disconnected, so that the density relay 1 can be checked online; then, the signal acquisition intelligent control unit 3 instructs the exhaust mechanism 406 to close the valve, and the booster device 404 drives the gas from the sealed cavity 409 through the connecting pipe 4041 to the flow control valve 4042 (or controller), and the flow control valve 4042 (or controller) performs flow control. The amount of control or regulation processing then enters the cavity of the plugging mechanism 405 through the check valve 4043 (the check valve 4043 has the function of preventing air pressure backflow), causing the plugging mechanism 405 (corrugated spring mechanism) to expand and move, driving the plugging mechanism 405 to move and compress the elastic element 408. The air pressure in the cavity of the plugging mechanism 405 continues to increase, causing the plugging mechanism 405 to expand and move to the interface of the corresponding connecting pipeline of the electrical equipment 6. The elastic sealing element 405A on the plugging mechanism 405 forms a sealing surface with the interface of the corresponding connecting pipeline of the electrical equipment 6, that is, the plugging mechanism 405 shuts off the gas path connection between the gas density relay 1 and the electrical equipment 6. At this moment, the gas density relay 1 and the pressure regulating mechanism 4 and the sensor in the signal acquisition intelligent control unit 3 are in the same sealed cavity.

[0054] Then, the booster device 404 continues to drive the gas in the sealed cavity 409 to be compressed into the cavity of the sealing mechanism 405, so that the air pressure in the sealed cavity 409 slowly decreases. Assuming that the gas density relay 1 has three contacts, the pressure reduction process in the cavity will trigger the action of the three contacts. During the entire pressure reduction process (i.e., the downstroke verification), the signal acquisition and intelligent control unit 3 automatically collects, records, and saves the corresponding pressure and temperature values ​​in the cavity when the contacts are triggered (including when the contacts are connected or disconnected). The signal acquisition and intelligent control unit 3 processes the temperature and pressure values ​​when the above contacts are triggered through a preset algorithm and records and / or saves them, which are the action verification values ​​of the contacts of the gas density relay 1.

[0055] After the signal acquisition intelligent control unit 3 acquires the required contact trigger state information, or after the signal acquisition intelligent control unit 3 meets the setting value of the sensor 407, the signal acquisition intelligent control unit 3 issues a corresponding instruction to stop the boosting device 404 (i.e., complete the downstroke verification).

[0056] Then, the signal acquisition intelligent control unit 3 processes and issues instructions to control the exhaust mechanism 406 to start working, and the exhaust mechanism 406 opens the valve. The valve of the exhaust mechanism 406 can be one of a flow controller, a pulse valve, a solenoid valve, an electric valve, a pressure reducing orifice plate, etc.

[0057] After the exhaust mechanism 406 opens the valve, the gas in the cavity of the sealing mechanism 405 overflows into the sealed cavity 409, causing the air pressure in the sealed cavity 409 to rise. The air pressure in the sealed cavity 409 is connected to the gas density relay 1, causing the gas density relay 1 to rise as the air pressure in the sealed cavity 409 rises. The gas density relay 1 then generates a contact action (upward stroke action value). During the entire pressure boosting process, the signal acquisition and intelligent control unit 3 will automatically collect, record, and save the cavity pressure and temperature values ​​when the contact is triggered (including whether the contact is connected or disconnected). The signal acquisition and intelligent control unit 3 records the temperature and pressure values ​​when the above-mentioned contacts are triggered through a preset algorithm, which is the reset (return) check value of the contacts of the gas density relay 1.

[0058] Then, the signal acquisition intelligent control unit 3 analyzes, processes and determines whether the downstroke and upstroke verification values ​​of the gas density relay 1 being verified are qualified, and can send the verification conclusion to the background system so that the operation and maintenance personnel can check and determine whether to perform maintenance on the density relay.

[0059] At the same time, the gas in the cavity of the plugging mechanism 405 continuously overflows, and finally the gas pressure in the cavity of the plugging mechanism 405 reaches a balance with the gas pressure of the sealed cavity 409, that is, they are connected. Due to the action of the elastic element 408 itself, the plugging mechanism 405 is automatically opened, and the elastic sealing element 405A on the plugging mechanism 405 is separated from the interface sealing surface of the corresponding connecting pipeline of the electrical equipment 6. The gas circuit of the electrical equipment 6 is connected with the gas density relay 1, the pressure regulating mechanism 4, and the sensor in the signal acquisition intelligent control unit 3. After the verification is completed, the signal acquisition intelligent control unit 3 automatically switches the secondary circuit signal back to the gas density relay 1 and connects it with the background signal, so that the gas density relay 1 resumes normal monitoring of the gas density of the gas chamber of the electrical equipment 6, so that the electrical equipment 6 can work safely and reliably.

[0060] Specifically, the signal acquisition intelligent control unit 3 controls the intermediate relay K1 to close the normally closed contacts K11 and K12 of the intermediate relay K1, so that the signal connection between the contacts of the gas density relay 1 and the monitoring circuit of the density relay is made, so that the density relay 1 can monitor the gas density of the electrical equipment 6 to ensure the reliable operation of the electrical equipment 6, that is, in the non-calibration state (when the gas density relay 1 works normally), such as Figure 2As shown, the gas density relay 1 is used to monitor the gas density in the gas chamber of the electrical equipment 6. When the gas pressure in the gas chamber of the electrical equipment 6 reaches the alarm / lockout value, it will trigger the signal conduction between the contact and the monitoring circuit of the density relay, and send an alarm or lockout signal to the background or secondary equipment through the monitoring circuit of the density relay.

[0061] Through the structural design of the monitoring device of the present invention, the gas density relay 1 completes the shutdown of the main body in a sealed cavity during the entire calibration process, and the gas pressure rises and falls, and SF6 gas will not leak into the atmosphere, thereby realizing a leak-free online calibration of the density relay in field operation.

[0062] It should be noted that the electrical equipment in the embodiment of the present invention may specifically be a switchgear, such as a GIS device. Of course, the gas density monitoring device may also be used for other electrical equipment that needs to monitor the internal gas density, which will not be elaborated here.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas density relay calibration method based on a monitoring device, characterized in that: The monitoring device comprises a signal acquisition intelligent control unit (3) and a pressure regulating mechanism (4), wherein the pressure regulating mechanism (4) comprises a housing (401), a pressurizing device (404) and a blocking mechanism (405); the housing (401) constitutes a sealed cavity (409), and the pressurizing device (404) and the blocking mechanism (405) are located in the sealed cavity (409); The gas density relay (1) calibration method comprises: performing a downstroke calibration and an upstroke calibration on the gas density relay (1) when the connecting pipeline between the sealed cavity (409) and the electrical equipment (6) is closed and the sealed cavity (409) and the gas density relay (1) are in conduction; Among them, the downstroke verification includes: The booster device (404) drives the gas in the sealed cavity (409) to be compressed into the cavity of the blocking mechanism (405), so that the gas pressure in the sealed cavity (409) decreases. During the pressure reduction process of the sealed cavity (409), the signal acquisition intelligent control unit (3) collects and records the corresponding pressure and temperature values ​​in the sealed cavity (409) when each contact of the gas density relay (1) is triggered, as the downstroke action verification value of the gas density relay (1), and draws a downstroke verification conclusion by comparing and analyzing with the corresponding standard value; The upper stroke calibration includes: After the downstroke verification is completed, the gas in the cavity of the sealing mechanism (405) is released to flow into the sealed cavity (409), so that the gas pressure in the sealed cavity (409) increases. During the pressure increase process of the sealed cavity (409), the signal acquisition intelligent control unit (3) collects and records the corresponding pressure and temperature values ​​in the sealed cavity (409) when each contact of the gas density relay (1) is triggered, which are used as the upstroke action verification value of the contact of the gas density relay (1), and the upstroke verification conclusion is obtained by comparing and analyzing with the corresponding standard value.

2. The gas density relay calibration method according to claim 1, characterized in that: The sealed cavity (409) is arranged on a pipeline between the gas density relay (1) to be measured and the electrical equipment (6); The air inlet end of the pressurizing device (404) is in communication with the sealed cavity (409), and the air outlet end of the pressurizing device (404) is in communication with the inner cavity of the blocking mechanism (405) via a connecting pipeline (4041).

3. The gas density relay calibration method according to claim 2, characterized in that: The connecting pipeline (4041) is provided with a flow control valve (4042) and a check valve (4043) in sequence in the direction from the boosting device (404) to the blocking mechanism (405).

4. The gas density relay calibration method according to claim 1, characterized in that: The blocking mechanism (405) is provided with an elastic sealing element (405A) and an exhaust mechanism (406); one end of the blocking mechanism (405) is fixed on the housing (401), and the other end thereof is used to selectively close or open the connection pipeline between the sealing cavity (409) and the electrical device (6) via the elastic sealing element (405A).

5. The gas density relay calibration method according to claim 4, characterized in that: The pressure regulating mechanism (4) further comprises an elastic element (408), wherein the elastic element (408) enables the elastic sealing element (405A) to have a tendency to open a connecting pipeline between the sealing cavity (409) and the electrical device (6).

6. The gas density relay calibration method according to claim 4, characterized in that: The blocking mechanism (405) is also provided with a sensor (407).

7. The gas density relay calibration method according to claim 4, characterized in that: The blocking mechanism (405) is a corrugated spring mechanism.

8. The gas density relay calibration method according to claim 1, characterized in that: The signal acquisition intelligent control unit (3) is provided with a pressure sensor and a temperature sensor; The signal acquisition intelligent control unit (3) is connected to the sealed cavity (409) and is used to acquire the gas pressure and temperature data in the sealed cavity (409) and complete the control of various functional components in the pressure regulating mechanism (4).

9. The gas density relay calibration method according to claim 8, characterized in that: The signal acquisition intelligent control unit (3) is connected to the gas density relay (1) via a signal line (2) to complete the acquisition of contact state data within the gas density relay (1).

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