A gas relay transient calibration device and method

Abstract

The present application discloses a gas relay transient calibration device and method, comprising: a power generation module, a pulsating flow generating chamber, a gas relay body, an oil storage and return module, a chamber, a processing system, and a control system; the power generation module is connected to the pulsating flow generating chamber; a regulating module is provided inside or at the outlet of the pulsating flow generating chamber; the pulsating flow generating chamber is connected to the gas relay body via a first calibration pipeline; a flow meter is installed on the outer wall of the first calibration pipeline; the gas relay body is connected to the oil storage and return module via a second calibration pipeline; the top of the oil storage and return module is connected to the chamber via an oil extraction pipeline; an oil extraction pump is provided at the inlet of the oil extraction pipeline; the top of the chamber is connected to the second calibration pipeline; and a liquid level gauge is provided in the chamber. The present invention can perform transient calibration on the gas relay, thereby assessing the transient action response of the relay, which conforms to the actual operating conditions and can prevent problems such as low sensitivity of the gas relay and untimely output signals during operation.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment detection, and in particular to a gas relay transient calibration device and method. Background Art

[0002] Gas protection is one of the primary protection features of transformers, effectively detecting internal faults such as interlayer and interturn short circuits, core faults, internal bushing faults, internal winding wire breaks, insulation degradation, and low oil levels. A gas relay (also known as a gas relay) is a functional gas protection device installed on the connecting pipe between the transformer's oil conservator and tank. The relay uses a magnetically controlled dry reed switch (reed switch) as the contact actuating element. It features a simple structure, compact size, low pull-in power, and high sensitivity. Its pull-in and release times are typically within 0.5 to 2 milliseconds, ensuring timely output of the actuation signal. When an internal transformer fault causes oil decomposition and gas production, or causes oil flow surges, the gas relay's contacts actuate, issuing an alarm (minor gas actuation) or trip (major gas actuation) signal. This facilitates the timely detection and removal of faulty equipment, preventing the occurrence or escalation of accidents. The adoption of gas relay contact actuation is of great significance.

[0003] In practice, gas relays require calibration upon shipment and after a certain period of operation (usually in conjunction with transformer overhauls) to verify reliable operation at the light and heavy gas operating settings. The operating flow rate setting for gas relays has traditionally been based on the steady-state flow rate within the connecting pipe. The calibration method, as per standard requirements, is as follows: Adjust the oil flow rate on the relay calibration bench (the oil temperature should be no less than 20°C) from zero. Under steady-state oil flow shocks between 30% and 40% of the set flow rate, allow the relay to stabilize for 3 to 5 minutes and observe its stability. Slowly increase the oil flow rate in increments of no more than 0.02 m / s until a tripping action is detected. The steady-state flow rate is then measured. The error in each relay operating value should be no more than ±10% of the set value.

[0004] The aforementioned calibration method uses a slowly increasing oil flow rate, resulting in a gas relay operating value that is essentially a steady, uniform oil flow. However, actual transformer faults typically produce transient oil surges, with the oil flow rate rapidly reaching the set value within a very short time (hundreds of milliseconds or even a few milliseconds). For some minor internal faults, the transient oil flow surge may exhibit a pulsed pattern, with a peak value near the set value, reaching the set value within a very short time before quickly falling back. The duration of the surge above the set value is extremely short (hundreds of milliseconds or even a few milliseconds). Therefore, even if a gas relay passes the current steady-state oil flow calibration method, its operation under actual transient oil flow shocks cannot be verified, hindering timely fault detection. Furthermore, the current calibration method stipulates that the error in each gas relay operating value must not exceed ±10% of the set value. Under this method, which uses a slowly increasing oil flow rate, the correct operating time of the gas relay is an uncertain, long period (more than several seconds). If the reed switch of the gas relay contacts is stuck, it cannot be detected. In practical applications, when the reed switch has a long sticking time, this hinders timely fault elimination. To sum up, the steady-state oil flow calibration method for gas relays that has been used has obvious shortcomings. It is of great significance to propose a transient calibration method for gas relays that conforms to actual operating conditions and develop a corresponding calibration device. To this end, the present invention proposes a gas relay transient calibration device and method. Summary of the Invention

[0005] The embodiments of the present application provide a gas relay transient calibration device and method, which enables transient calibration of the gas relay, and further assesses the transient action response of the relay, which conforms to the actual operating conditions and can prevent problems such as low sensitivity of the gas relay and untimely output signals during operation.

[0006] The first aspect of the present application provides a gas relay transient calibration device, comprising: a power generation module, a pulsating flow generation chamber, a gas relay body, an oil storage and return module, a chamber, a processing system, and a control system;

[0007] The power generation module is connected to the pulsating flow generation chamber;

[0008] A regulating module for regulating oil flow pulses is provided inside or at the outlet of the pulsating flow generating chamber;

[0009] The pulsating flow generating chamber is connected to the gas relay body through a first calibration pipeline;

[0010] A flow meter is installed on the outer side of the pipe wall of the first calibration pipeline;

[0011] The gas relay body is connected to the oil storage and return module through a second calibration pipeline;

[0012] The top of the oil storage and return module is connected to the cavity via an oil extraction pipeline;

[0013] An oil pump is provided at the inlet of the oil extraction pipeline;

[0014] The top of the chamber is connected to the second calibration pipeline;

[0015] A liquid level gauge is provided in the cavity;

[0016] The control system is electrically connected to the power generation module, the regulation module and the oil pump respectively;

[0017] The processing system is electrically connected to the flow meter, the liquid level meter, the gas relay body and the control system respectively.

[0018] Optionally, a first solenoid valve is provided at the outlet of the power generation module;

[0019] A second solenoid valve is provided at the outlet of the pulsating flow generating chamber;

[0020] A third solenoid valve is provided at the inlet of the oil storage and return module;

[0021] The top of the chamber is connected to the second calibration pipeline via a fourth solenoid valve;

[0022] The bottom of the chamber is connected to the oil extraction pipeline via a fifth solenoid valve;

[0023] The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are all electrically connected to the control system.

[0024] Optionally, the distance between the flow meter and the pulsating flow generating chamber is not less than 1 m.

[0025] Optionally, the oil storage and return module is located above the pulsating flow generating chamber.

[0026] Optionally, the oil storage and return module is provided with an oil level indicator for displaying the oil level therein.

[0027] Optionally, a temperature sensor for detecting the oil temperature during calibration is provided inside the oil storage and return module;

[0028] The temperature sensor is electrically connected to the processing system.

[0029] Optionally, a bleed plug is provided at the top of the first calibration pipeline for balancing the internal and external pressures when pumping and injecting oil.

[0030] Optionally, the power generation module is an air cannon, a high-pressure spray gun or a punching machine.

[0031] Optionally, the flow meter is an ultrasonic flow meter.

[0032] A second aspect of the present application provides a gas relay transient calibration method, which is implemented based on the above-mentioned gas relay transient calibration device, and includes: the power generation module applies a standard oil flow pulse to the insulating oil in the pulsating flow generating chamber, and the processing system generates a synchronization curve based on the detected gas relay heavy gas contact action signal and the oil flow pulse signal;

[0033] According to the synchronization curve, determine whether the flow rate corresponding to the gas relay's heavy gas action moment is within the first preset range. If so, the response time is determined by calculating the difference between the rising time and falling time of the pulse curve corresponding to the gas relay's heavy gas action moment, reset time, and flow rate lower limit. If the response time is within the second preset range, the gas relay passes the verification. If the response time is not within the second preset range, the gas relay fails the verification.

[0034] It can be seen from the above technical scheme that the embodiment of the present application has the following advantages: it includes a power generating module, a pulsating flow generating chamber, a gas relay body, an oil storage and return module, a storage chamber, a processing system and a control system. The power generating module is connected to the pulsating flow generating chamber, and a regulating module for regulating the oil flow pulse is provided inside or at the outlet of the pulsating flow generating chamber. The pulsating flow generating chamber is connected to the gas relay body through a first calibration pipeline. A flow meter is installed on the outside of the pipe wall of the first calibration pipeline. The gas relay body is connected to the oil storage and return module through a second calibration pipeline. The top of the oil storage and return module is connected to the storage chamber through an oil extraction pipeline. An oil extraction pump is provided at the inlet of the oil extraction pipeline. The top of the storage chamber is connected to the second calibration pipeline. A liquid level meter is provided in the storage chamber. The control system is electrically connected to the power generating module, the regulating module and the oil extraction pump respectively. The processing system is electrically connected to the flow meter, the liquid level meter, the gas relay body and the control system respectively. By using a transient power generation module to generate oil flow pulses to perform transient calibration on the gas relay body, the transient action response of the gas relay body can be assessed. The calibration method conforms to the actual operating conditions and can prevent problems such as low sensitivity of the gas relay and untimely output signals during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a gas relay transient calibration device according to an embodiment of the present application;

[0036] Figure 2 This is a calibration synchronization curve diagram actually measured by the gas relay transient calibration device in the embodiment of the present application;

[0037] Figure 3 This is a calibration synchronization curve diagram of the gas relay transient calibration device in the embodiment of the present application taking into account the reed switch sticking factor;

[0038] Wherein, the accompanying drawings are marked as follows:

[0039] 1-Power generation module, 2-First solenoid valve, 3-Pulsating flow generation chamber, 4-Regulation module, 5-First calibration pipeline, 6-Flowmeter, 7-Bleed plug, 8-Gas relay body, 9-Second calibration pipeline, 10-Oil storage and return module, 11-Flange, 12-Second solenoid valve, 13-Third solenoid valve, 14-Fourth solenoid valve, 15-Oil pump, 16-Ventilation chamber, 17-Fifth solenoid valve, 18-Liquid level gauge. DETAILED DESCRIPTION

[0040] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.

[0043] See also Figures 1 to 3 The present application provides a gas relay transient calibration device, including: a power generating module 1, a pulsating flow generating chamber 3, a gas relay body 8, an oil storage and return module 10, a chamber 16, a processing system and a control system, and the power generating module 1 is connected to the pulsating flow generating chamber 3.

[0044] It should be noted that the power generation module 1 provides a transient impact force to the calibration device, acting on the insulating oil within the pulsating flow generating chamber 3 to generate an initial oil flow pulse. Specifically, the power generation module 1 includes, but is not limited to, an air cannon, a high-pressure spray gun, or a punch press. The pulsating flow generating chamber 3 provides the work space for the power generation module 1, stimulating the oil flow surge within the chamber and releasing it through the pipe outlet, forming an oil flow pulse.

[0045] A regulating module 4 for regulating the oil flow pulse is provided inside or at the outlet of the pulsating flow generating chamber 3. It is understandable that once the action energy of the power generating module 1 is set, the characteristics of the initial oil flow pulse generated by the pulsating flow generating chamber 3 (including the rise time t f and peak flow rate V max The two characteristic parameters are also fixed. The greater the action energy, the faster the rise time t of the initial oil flow pulse. f The shorter (i.e. the steeper the rising edge), the higher the peak flow rate V that can be achieved max The higher the f With V max There is a correlation, and a single method of setting action energy cannot guarantee t f and V max At the same time, the standard oil flow pulse parameter requirements required for transient verification are met. Therefore, a regulating module 4 is set inside or at the outlet of the pulsating flow generating chamber 3. Specifically, its regulating method includes but is not limited to controlling the pipe diameter of the outlet of the pulsating flow generating chamber 3, controlling the capacity of the pulsating flow generating chamber 3, adjusting the internal structure of the pulsating flow generating chamber 3, etc., and coordinating the energy setting to jointly generate the standard oil flow pulse required for transient verification (rise time t ref and peak flow rate V ref ), thereby achieving adjustable peak flow rate and rise time of the oil flow pulse.

[0046] The pulsating flow generating chamber 3 is connected to the gas relay body 8 via a first calibration line 5. A flow meter 6 is installed on the outer wall of the first calibration line 5. The gas relay body 8 is connected to the oil storage and return module 10 via a second calibration line 9. The first calibration line 5 and the second calibration line 9 have the same diameter. The first calibration line 5 and the second calibration line 9 divide the main body of the calibration device into two parts. One or both sides of the two parts are located on a movable platform. The distance between the two sides is adjusted by the control system to achieve the loading of the gas relay to be calibrated. Specifically, the two ends of the first calibration line 5 are connected to the pulsating flow generating chamber 3 and the gas relay body 8 respectively via flanges 11, and the two ends of the second calibration line 9 are connected to the gas relay body 8 and the oil storage and return module 10 respectively via flanges 11.

[0047] It should be noted that: the right end of the first verification pipeline 5 and the left end of the second verification pipeline 9 are clamped and connected to the gas relay to be verified, and a flow meter 6 that meets the transient flow velocity measurement requirements is installed on the outside of the pipe wall near the right end of the first verification pipeline 5, wherein the flow meter 6 can be an ultrasonic flow meter 6 (with a response time of milliseconds), which can measure the flow velocity of the first verification pipeline 5 non-contact, thereby not affecting the internal flow field of the first verification pipeline 5.

[0048] The top of the oil storage and return module 10 is connected to the cavity 16 through an oil extraction pipeline. An oil extraction pump 15 is provided at the inlet of the oil extraction pipeline, which is used to drain the oil stored in the first calibration pipeline 5, the second calibration pipeline 9, the cavity 16 and the gas relay body 8 after the calibration is completed; the top of the cavity 16 is connected to the second calibration pipeline 9, and a liquid level gauge 18 is provided in the cavity 16 for gas volume calibration of the gas relay.

[0049] A first solenoid valve 2 is provided at the outlet of the power generating module 1, and the release of energy is controlled by the first solenoid valve 2; a second solenoid valve 12 is provided at the outlet of the pulsating flow generating chamber 3, which seals the insulating oil in the chamber when it is not working; a third solenoid valve 13 is provided at the inlet of the oil storage and return module 10, which seals the internal insulating oil when it is not working; the top of the cavity 16 is connected to the lower part of the second calibration pipeline 9 through a fourth solenoid valve 14, and the internal oil storage amount is measured by but not limited to a built-in liquid level gauge 18, and the fourth solenoid valve 14 at the connection is controlled to open to realize transient calibration of the gas volume; the bottom of the cavity 16 is connected to the oil extraction pipeline through a fifth solenoid valve 17, and when the oil pump 15 is not working, the fifth solenoid valve 17 is in a normally closed state.

[0050] The control system is electrically connected to the power generating module 1, the regulating module 4, the oil pump 15, the first solenoid valve 2, the second solenoid valve 12, the third solenoid valve 13, the fourth solenoid valve 14 and the fifth solenoid valve 17 respectively. The control system controls the opening and closing of each solenoid valve, sets the action energy of the power generating module 1, controls the regulating module 4 and the two parts of the control device to move and load the gas relay to be calibrated, controls the start and stop of the oil pump 15 of the pipeline connecting the oil storage and return module 10 and the second calibration pipeline 9, etc.; the processing system is electrically connected to the flow meter 6, the liquid level meter 18, the gas relay body 8 and the control system respectively. The processing system collects the output information of the flow meter 6, the liquid level meter 18, the temperature sensor, the contacts of the calibrated gas relay, etc., processes the calculation, feedback control system, generates reports, saves data, etc.

[0051] The distance between the flow meter 6 and the pulsating flow chamber 3 is not less than 1m. It should be noted that: in order to ensure the accuracy of the flow velocity measurement, the distance between the left end of the first calibration pipeline 5 and the connection point of the pulsating flow chamber 3 and the flow velocity measurement point is not less than 1m to prevent turbulence and eddy currents caused by the pipeline being too short.

[0052] The oil storage and return module 10 is located above the pulsating flow chamber 3, that is, the horizontal height of the oil storage and return module 10 is higher than the horizontal height of the pulsating flow chamber 3, ensuring that the pulsating flow chamber 3 and the pipeline are filled with insulating oil when the calibration device is in working condition.

[0053] The oil storage and return module 10 is provided with an oil level indicator for displaying the oil level therein; a temperature sensor for detecting the oil temperature during calibration is provided inside the oil storage and return module 10, and the temperature sensor is electrically connected to the processing system; the oil storage and return module 10 achieves internal and external pressure balance of the module through, but not limited to, communication with the external air, built-in capsules, built-in bellows, etc., to prevent damage to the device caused by the pressure generated by transient oil flow surges during calibration.

[0054] A vent plug 7 is provided at the top of the first calibration pipeline 5 for balancing the internal and external pressures when pumping and filling oil.

[0055] The present application also provides a gas relay transient calibration method, which is implemented based on the above-mentioned gas relay transient calibration device, and the method specifically includes: the power generating module 1 applies a standard oil flow pulse to the insulating oil in the pulsating flow generating chamber 3, and the processing system generates a synchronization curve based on the detected gas relay heavy gas contact action signal and the oil flow pulse signal; according to the synchronization curve, it is determined whether the flow rate corresponding to the gas relay heavy gas action moment is within a first preset range. If not, the gas relay fails the calibration; if so, the response time is determined by calculating the difference between the rising time and the falling time of the pulse curve corresponding to the gas relay heavy gas action moment, the reset time, and the flow rate lower limit. If the response time is within the second preset range, the gas relay passes the calibration; if the response time is not within the second preset range, the gas relay fails the calibration.

[0056] Specifically, the gas relays used on transformers of different capacities are divided into several gears, and the flow rate calibration of the gas relays in each gear corresponds to different standard oil flow pulses. Considering the deviation of actual modulation, the rise time of the standard oil flow pulse t ref and peak flow rate V ref A certain range of deviation is allowed.

[0057] like Figure 2 and Figure 3 As shown in the figure, after each oil flow pulse impact, the device automatically measures and processes to generate a synchronous curve. Figure 2 The solid line is the oil flow pulse curve measured by the flow meter 6, and the dotted line is the heavy gas signal. t1 is the heavy gas action moment, and its corresponding flow velocity is Vs. t2 is the heavy gas reset moment. Without considering the sticky factor of the reed switch, the flow velocity corresponding to t2 should also be Vs. V min If the calibrated gas relay is heavily gas-activated under the impact of standard oil flow pulses, and the flow rate corresponding to the action moment is within [Vmin , V ref ](pulse rising edge) and [V ref , V min ](pulse falling edge) range, then proceed to the next step of judgment, otherwise the verification fails. Figure 3 In order to consider the calibration synchronization curve of the reed switch hysteresis factor, the actual time when the gas relay baffle is in place is t1 (t1 cannot be measured), the heavy gas action time is t1', and the reed switch closing hysteresis time t b =t1'-t1,t b Therefore, the viscosity calibration basis is given in combination with the synchronous curve: △t=|(t2'-t1')-(t3-t0)|, and the range of △t is set. If △t meets the requirements, the gas relay flow rate calibration is qualified.

[0058] For gas volume calibration, after the light gas is sent, close the fourth solenoid valve 14, collect the signal of the liquid level meter 18 to calculate the insulating oil volume V in the chamber 16, and compare it with the standard value V ref Compare and verify the gas volume. If the error is within the allowable range, the gas volume calibration is qualified.

[0059] In specific implementation, the transient verification of the gas relay includes the following steps:

[0060] Step 1: Modulate the standard oil flow pulse

[0061] (1) Before modulation, the first solenoid valve 2, the second solenoid valve 12, the third solenoid valve 13, the fourth solenoid valve 14 and the fifth solenoid valve 17 at the power generating module 1, the pulsating flow generating chamber 3, the oil storage and return module 10 and the storage chamber 16 are all in the closed state, the pulsating flow generating chamber 3 and the oil storage and return module 10 are filled with insulating oil, and there is no insulating oil in the first calibration pipeline 5, the second calibration pipeline 9 and the storage chamber 16.

[0062] (2) Adjust the distance between the first calibration pipeline 5 and the second calibration pipeline 9 until they are clamped together, tighten the contact flange 11 to seal it, and open the vent plug 7 at the top of the first calibration pipeline 5.

[0063] (3) Open the second solenoid valve 12 at the outlet of the pulsating flow chamber 3 and the third solenoid valve 13 at the inlet of the oil storage and return module 10 in sequence until oil flows out of the bleed plug 7 at the top of the first calibration pipeline 5. Then tighten the bleed plug 7. At this point, the first calibration pipeline 5 and the second calibration pipeline 9 are fully filled with oil.

[0064] (4) Controlling the power generation module 1 to store and release energy. Taking the power generation module 1 as an air cannon as an example, the control system controls the air compressor to inflate the air cannon. The energy level is set by the pressure value fed back by the pressure gauge. When the air reaches the set energy value, the first solenoid valve 2 at the outlet of the air cannon is triggered to release the energy. After the release is completed, the first solenoid valve 2 is immediately closed.

[0065] (5) Measure the oil flow pulse curve, which is the initial oil flow pulse without adjustment. f0 With V max0 The feedback control system is provided with an adjustment module 4, and the above step (4) is repeated until the standard oil flow pulse curve required for calibration is retrieved.

[0066] (6) Close the second solenoid valve 12 of the pulsating flow chamber 3 and the third solenoid valve 13 of the oil storage and return module 10, open the fourth solenoid valve 14, and start the oil pump 15 to extract the remaining insulating oil in the first calibration pipeline 5 and the second calibration pipeline 9 (the bleed plug 7 must be opened when the oil pump 15 is operating). After the insulating oil is drained, close the fourth solenoid valve 14 and turn off the oil pump 15.

[0067] Step 2: Load the gas relay to be calibrated

[0068] (1) Adjust the distance between the first calibration pipeline 5 and the second calibration pipeline 9 through the control system, clamp the gas relay to be calibrated between the two pipelines, align the flange 11 surface, continue to adjust the distance between the two pipelines until the gas relay is clamped, and tighten the contact flange 11 surface to seal it.

[0069] (2) Connect the light and heavy gas action contacts of the gas relay to the sampling circuit of the processing system.

[0070] Step 3: Flow rate calibration

[0071] (1) Open the air vent plug in the top junction box of the gas relay.

[0072] (2) Open the second solenoid valve 12 at the outlet of the pulsating flow chamber 3 and the third solenoid valve 13 at the inlet of the oil storage and return module 10 until oil flows out of the outlet plug at the top of the gas relay. Tighten the outlet plug again. At this point, the first calibration pipeline 5, the second calibration pipeline 9, and the gas relay are fully filled with oil.

[0073] (3) Control the power generation module 1 to store and release energy, generating modulated standard oil flow pulses.

[0074] (4) Synchronously collect the data of the velocity meter 6 and the output signal of the heavy gas contact to the processing system, save the corresponding data, draw curves, and generate reports.

[0075] Step 4: Gas volume calibration

[0076] (1) After the flow rate calibration is completed and the device returns to stability, proceed to the gas volume calibration. Open the air outlet plug in the junction box at the top of the gas relay until oil comes out, and then tighten the air outlet plug again.

[0077] (2) Close the second solenoid valve 12 at the outlet of the pulsating flow chamber 3 and the third solenoid valve 13 at the inlet of the oil storage and return module 10, and open the fourth solenoid valve 14 at the top of the chamber 16.

[0078] (3) Open the outlet plug of the gas relay and drain the oil from the relay (the draining speed can be controlled by the fourth solenoid valve 14) until the light gas contact output signal is fed back to close the fourth solenoid valve 14 and restore the light gas signal. Synchronously collect the data of the liquid level meter 18 in the cavity 16 and send it to the processing system, save the corresponding data, and generate a report.

[0079] Step 5: Reset the device

[0080] (1) Open the fourth solenoid valve 14 and the fifth solenoid valve 17 at the top and bottom of the chamber 16, and start the oil pump 15 to extract the insulating oil from the first calibration pipeline 5, the second calibration pipeline 9 and the gas relay until the liquid level measured by the liquid level gauge 18 in the chamber 16 is zero.

[0081] (2) Remove the gas relay.

[0082] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas relay transient calibration device, characterized in that: include: Power generation module, pulsating flow generation chamber, gas relay body, oil storage and return module, chamber, processing system and control system; The power generation module is connected to the pulsating flow generation chamber; A regulating module for regulating oil flow pulses is provided inside or at the outlet of the pulsating flow generating chamber; The adjustment method of the adjustment module includes controlling the diameter of the pipe at the outlet of the pulsating flow generating chamber, controlling the capacity of the pulsating flow generating chamber, adjusting the internal structure of the pulsating flow generating chamber, and coordinating the energy setting to jointly generate the standard oil flow pulse required for transient calibration, thereby achieving adjustable peak flow rate and rise time of the oil flow pulse; The pulsating flow generating chamber is connected to the gas relay body through a first calibration pipeline; A flow meter is installed on the outer side of the pipe wall of the first calibration pipeline; The gas relay body is connected to the oil storage and return module through a second calibration pipeline; The top of the oil storage and return module is connected to the cavity via an oil extraction pipeline; An oil pump is provided at the inlet of the oil extraction pipeline; The top of the chamber is connected to the second calibration pipeline; A liquid level gauge is provided in the cavity; The control system is electrically connected to the power generation module, the regulation module and the oil pump respectively; The processing system is electrically connected to the flow meter, the liquid level meter, the gas relay body and the control system respectively; The distance between the flow meter and the pulsating flow generating chamber is not less than 1m; The oil storage and return module is located above the pulsating flow generating chamber.

2. The gas relay transient calibration device according to claim 1, characterized in that: A first solenoid valve is provided at the outlet of the power generation module; A second solenoid valve is provided at the outlet of the pulsating flow generating chamber; A third solenoid valve is provided at the inlet of the oil storage and return module; The top of the chamber is connected to the second calibration pipeline via a fourth solenoid valve; The bottom of the chamber is connected to the oil extraction pipeline via a fifth solenoid valve; The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are all electrically connected to the control system.

3. The gas relay transient calibration device according to claim 1, characterized in that: The oil storage and return module is provided with an oil level indicator for displaying the oil level inside the module.

4. The gas relay transient calibration device according to claim 1, characterized in that: The oil storage and return module is internally provided with a temperature sensor for detecting the oil temperature during calibration; The temperature sensor is electrically connected to the processing system.

5. The gas relay transient calibration device according to claim 1, characterized in that: A bleed plug is provided at the top of the first calibration pipeline for balancing the internal and external pressures when pumping and injecting oil.

6. The gas relay transient calibration device according to claim 1, characterized in that: The power generation module is an air cannon, a high-pressure spray gun or a punching machine.

7. The gas relay transient calibration device according to claim 1, characterized in that: The flow meter is an ultrasonic flow meter.

8. A gas relay transient calibration method, implemented based on the gas relay transient calibration device according to any one of claims 1 to 7, characterized in that: The method comprises: the power generation module applies a standard oil flow pulse to the insulating oil in the pulsating flow generation chamber, and the processing system generates a synchronization curve according to the detected gas relay heavy gas contact action signal and the oil flow pulse signal; According to the synchronization curve, determine whether the flow rate corresponding to the gas relay's heavy gas action moment is within the first preset range. If so, the response time is determined by calculating the difference between the rising time and falling time of the pulse curve corresponding to the gas relay's heavy gas action moment, reset time, and flow rate lower limit. If the response time is within the second preset range, the gas relay passes the verification. If the response time is not within the second preset range, the gas relay fails the verification.

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