Performance detection setting test method and system for gas relay

Abstract

The invention relates to the field of relay performance detection, and discloses a performance detection setting test method and system for a gas relay, and the method comprises the steps: configuring a verification table which is used for providing an environment and an interface required by verification for the gas relay, introducing oil flow at a preset flow rate through an oil path system, enabling the relay to be filled with oil, and slowly discharging the oil, the displacement sensor sequentially monitors the displacement fluency of the upper edges of the baffle and the floater and performs jamming detection; heavy gas fixed value verification and light gas fixed value verification are executed respectively; and the control system is used for recording the detection data and the jam state and generating a detection report containing performance evaluation. The hidden fault of the gas relay is detected in a targeted manner, and the problem of loopholes of the hidden fault of the relay in an existing method is solved. Personal errors are reduced, and the verification precision is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of relay performance detection, and particularly relates to a performance detection and setting test method and system for a gas relay. BACKGROUND

[0002] Power equipment detection technology is an important guarantee for the safe and stable operation of the power system. With the continuous development of the power system and the increasing complexity of power equipment, higher requirements are put forward for the detection and verification of power equipment. As a key protection device of oil-immersed power transformers, the reliability of the performance of the gas relay is directly related to the safe operation of the transformer. Therefore, periodic verification of the gas relay, especially heavy gas setting and light gas setting, to ensure that it can accurately and timely send signals when a fault occurs in the transformer, is an important task in the field of power equipment detection.

[0003] The existing automatic gas relay performance detection method realizes efficient verification of conventional relays through mechanical arm adjustment and sensor monitoring, solving the problems of time-consuming and damage in traditional disassembly methods, but this method mainly targets normal operation of conventional relays and does not consider the characteristics of relays, such as oil deposition, component aging and other problems caused by long-term operation, which are prone to hidden faults such as jamming and sensitivity decay. The existing method only focuses on whether the relay action value meets the setting value, and cannot effectively identify such hidden faults. In addition, the existing method lacks evaluation of the aging degree of the relay, and only makes a simple determination of pass or fail, which cannot provide accurate reference for equipment reuse or replacement. SUMMARY

[0004] Therefore, the present application provides a performance detection and setting test method and system for a gas relay to solve the above problems.

[0005] To solve the above technical problems, the present application provides a performance detection and setting test method for a gas relay, comprising:

[0006] A verification table configured to provide the required environment and interface for verification of the gas relay, the verification table comprising an oil circuit system and a gas circuit system; wherein the oil circuit system is configured with a flow rate sensor, and the sealing test device is configured with a force sensor; the verification table further comprises a mechanical arm for fine adjustment of the gas relay, and the execution end of the mechanical arm is configured with a displacement sensor;

[0007] The oil flow of a preset flow rate is introduced through the oil circuit system to trigger the action of the weight and the baffle, and the displacement sensor is used to monitor the smoothness of the component displacement and perform jamming detection;

[0008] Heavy gas setting verification and light gas setting verification are performed respectively; wherein,

[0009] Heavy gas calibration is verified by flow sensor and force sensor to detect and verify stability, and light gas calibration is verified by liquid level sensor.

[0010] The control system is used to record the detection data and the sticking state, and generate a detection report containing performance evaluation.

[0011] As an optional way, the sticking detection includes:

[0012] A preset flow rate of oil is introduced into the relay inlet, and the displacement sensor is used to monitor and record the displacement of the upper edge during the deflection process of the internal baffle;

[0013] After the relay is filled with oil, the oil is slowly discharged, and the displacement sensor is used to monitor and record the displacement of the upper edge during the descent of the float;

[0014] Then, the monitored displacement curve with time is compared and analyzed with the pre-set normal displacement threshold curve;

[0015] If there is a stagnation segment or the fluctuation amplitude exceeds the normal threshold range in the displacement change curve, it can be determined that there is a sticking risk.

[0016] As an optional way, if it is determined that there is a sticking risk, the control system instructs the oil circuit system to output a pulse oil flow, and the impact force is formed by the periodic fluctuation of the oil flow rate within the preset range, and the baffle deflection center shaft, the float and the center point of the weight are flushed multiple times; After flushing, the preset flow rate of oil is introduced again, and the relay is filled with oil and slowly discharged. The displacement sensor monitors the displacement of the baffle and the upper edge of the float again, and if the displacement change curve returns to the normal threshold range, the current sticking state is recorded and subsequent verification is performed.

[0017] As an optional way, the heavy gas calibration includes:

[0018] The control system instructs the oil circuit system to adjust the oil flow rate, which starts from a preset oil flow rate and gradually increases to a preset heavy gas calibration value, and the flow sensor synchronously monitors the oil flow rate at the gas relay inlet; When the baffle is deflected to the limit position and the heavy gas reed contact point is attracted to trigger a signal, record the flow rate data v d monitored by the flow sensor at this time as the actual action value of the heavy gas.

[0019] As an optional way, the heavy gas calibration further includes:

[0020] After the actual action value of the heavy gas is obtained, the control system controls the oil circuit system to restore the initial flow rate and stabilize for a preset time length, the verification is repeated at least twice, and at least three groups of actual action values of the heavy gas are obtained; the control system calculates the deviation values of the groups of action values, compares the fluctuation range of the deviation values with the preset heavy gas setting value, and evaluates the performance stability of the heavy gas in combination with the jamming state of the baffle recorded by the jamming detection.

[0021] As an optional mode, the heavy gas setting value verification further includes: the mechanical arm applies a periodic pulling force to the spring, the slope change of the actual pulling force curve is calculated in real time based on a preset pulling force parameter interval, if the slope fluctuation is in the preset pulling force parameter interval, it is determined that the spring state is normal, and the verification is continued; if the slope gradually decreases, it is determined that the spring is fatigued, the verification strategy is automatically adjusted, the verification times of the heavy gas setting value are increased to at least four repeated verifications, if the deviation of the results of the multiple verifications is less than a preset threshold value, the verification is continued, and the spring fatigue risk is marked in the report; if the deviation is greater than the preset threshold value, it is prompted that the spring needs to be disassembled and replaced.

[0022] As an optional mode, the light gas setting value verification includes:

[0023] After the control system instructs the oil circuit system to fill the relay with oil, the oil is slowly discharged by opening the air release valve, and the oil level sensor monitors the change of the oil surface position; when the float drops to a certain position with the oil surface, the light gas reed switch contact is attracted to trigger a signal, and the oil volume value (i.e., the gas volume action value V d ) discharged from the relay at this time is recorded as the actual action value of the light gas.

[0024] As an optional mode, the light gas setting value verification further includes:

[0025] After the actual action value of the light gas is obtained, the control system controls the oil circuit system to continue to fill the relay with oil, and the verification process is repeated at least twice to obtain at least three groups of actual action values of the light gas; the control system calculates the deviation values of the groups of action values, compares the fluctuation range of the deviation values with the preset light gas setting value, and evaluates the performance stability of the light gas if the deviation values are within the threshold value range in combination with the float jamming state recorded by the jamming detection.

[0026] On the other hand, the present application also provides a performance detection and setting test system of a gas relay for executing the performance detection method of the gas relay, which includes:

[0027] The mechanical arm, the flow rate sensor, the force sensor, the displacement sensor, the liquid level sensor control system, and the verification table;

[0028] The mechanical arm is used for adjusting the action value of the heavy gas and adjusting the action value of the light gas.

[0029] The flow rate sensor is installed in the oil circuit of the calibration table, the force sensor is installed on the force transmission path of the spring, the displacement sensor is installed at the execution end of the mechanical arm, and the liquid level sensor is installed on the inner wall of the gas relay; wherein, the control system is in communication connection with the above-mentioned sensors respectively;

[0030] The calibration table mainly comprises an oil circuit system and a gas circuit system.

[0031] The beneficial effects of the present application are:

[0032] The present application optimizes the detection logic for the hidden faults and structural vulnerability of the gas relay, accurately captures the hidden problems of the gas relay caused by aging through the recognition of sticking and repetitive verification on the basis of continuing advantages, solves the problem of insufficient adaptability of the existing method to the relay, and provides reliable support for the performance evaluation and reuse decision of the relay. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the performance detection setting test flowchart of the prior art gas relay;

[0034] Figure 2 is the performance detection setting test flowchart of the gas relay of the present application;

[0035] Figure 3 is the mechanical arm structure diagram of the present application;

[0036] Figure 4 is the heavy gas setting adjustment mechanical operation flowchart of the present application;

[0037] Figure 5 is the light gas setting adjustment mechanical operation flowchart of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the reader better understand the present application. However, the technical scheme claimed by the present application can be realized even without these technical details and various changes and modifications based on the following embodiments.

[0039] In the following description, certain specific details are set forth in order to provide a thorough understanding of various disclosed embodiments. However, one skilled in the relevant arts will recognize that embodiments can be practiced without one or more of the specific details, or with certain implementations involving somewhat different methodologies, artwork, structures and techniques. In other instances, well-known apparatuses, structures, and techniques have not been shown or described in order to avoid obscuring the description of the embodiments.

[0040] The gas relay is the core protection device of the oil-immersed power transformer, and its performance reliability is directly related to the safe operation of the transformer, which needs to be checked regularly. The gas relay (relay that has been operated for a long time or removed from the equipment for inspection) is prone to hidden failures due to long-term oil flow scouring, oil deposition, and component natural aging, such as deflection of the baffle center shaft, sticking of the float and heavy hammer center point due to oil contamination, and reduced trigger stability of the spring due to fatigue. Therefore, the purpose of the present embodiment is to solve the above problems. Specifically, as shown in Figures 1-2 In one application embodiment, the present embodiment provides a performance detection and setting test method for a gas relay, comprising:

[0041] A verification table is configured to provide the required environment and interface for the gas relay verification, and the verification table includes an oil circuit system and a gas circuit system; wherein the oil circuit system is configured with a flow rate sensor, a force sensor is arranged on the force transmission path of the spring, and a liquid level sensor is arranged on the inner wall of the gas relay; the verification table further includes a mechanical arm for fine adjustment of the gas relay, and the execution end of the mechanical arm is configured with a displacement sensor;

[0042] A preset flow rate oil flow is introduced through the oil circuit system, and the relay is filled with oil and then slowly drained, and the displacement sensor monitors the displacement smoothness of the baffle and the upper edge of the float and performs sticking detection;

[0043] Respectively perform heavy gas setting value verification and light gas setting value verification; wherein the heavy gas setting value verification is detected and verified by the flow rate sensor and the force sensor in cooperation, and the light gas setting value verification is detected by the liquid level sensor; the control system is used to record the detection data and the sticking state, and generate a detection report containing performance evaluation.

[0044] In the present embodiment, the sticking detection includes:

[0045] First, introduce a preset flow rate oil flow at the relay inlet, and use the displacement sensor to monitor and record the upper edge displacement during the deflection of the internal baffle. Second, fill the relay with oil and then slowly drain it, and use the displacement sensor to monitor and record the upper edge displacement during the descent of the float. Then, compare and analyze the monitored displacement change curve with the pre-set normal displacement change threshold curve. If there is a stagnation segment or the fluctuation amplitude exceeds the normal threshold range in the displacement change curve, it can be determined that there is a sticking risk.

[0046] The displacement change curve refers to the curve of the displacement amount changing with time, which is used to reflect the movement state of the component under the action of the oil flow.

[0047] In actual detection, when the oil circuit system introduces a low flow rate oil flow, the baffle will slowly deflect and swing under the push of the oil flow; the relay slowly drains after being filled with oil, and the float slightly floats up and down during the descending process, and the displacement sensor will record the displacement of the baffle and the upper edge of the float in turn and form a continuous curve through multiple records. Under normal circumstances, the curve is smooth and continuously rising; if there is oil dirt adhesion and other jamming, the curve will have abnormal characteristics, such as stagnation, which indicates that the component is stuck and cannot continue to move with the oil flow; if there is a large fluctuation, it indicates that the component is repeatedly jammed and loosened, and the movement is not smooth.

[0048] Therefore, in one implementation scenario, the jamming detection can be:

[0049] Through the oil circuit system of the verification platform, a standard low flow rate oil flow of 0.3-0.5 m / s is simulated to trigger the baffle to deflect and swing, and the displacement sensor records the displacement trajectory of the component in real time: if the displacement trajectory has a stagnation segment, i.e., the displacement of the upper edge of the baffle per unit time during the deflection process is less than the conventional historical data or the built-in standard of the relay, or there is a reciprocating jitter, it is determined that there is a jamming risk;

[0050] Through the oil circuit system of the verification platform, a standard slow oil discharge of 10 mL / s is simulated to trigger the float to descend, and the displacement sensor records the displacement trajectory of the component in real time: if the displacement trajectory has a stagnation segment, i.e., the displacement of the upper edge of the float per unit time during the descending process is less than the conventional historical data or the built-in standard of the relay, it is determined that there is a jamming risk;

[0051] Then, the jamming is relieved by controlling the oil flow rate of the oil circuit system to be quickly switched between 0.3-0.8 m / s for multiple pulse flushing, using the impact force of the oil flow to strip the floating oil on the surface of the component, and the displacement sensor detects the displacement trajectory again. If the jamming feature disappears, it enters the subsequent verification; if it persists, it is recorded as a jamming fault that needs to be focused on.

[0052] In this embodiment, the mechanical arm is a mechanical device that can automatically perform various actions, and through precise motion control, it can complete tasks such as positioning, disassembly, adjustment, installation, etc. The sensor is a device for detecting and measuring physical quantities (such as flow rate, force, displacement, etc.), which can convert the detected physical quantity into an electrical signal output. The control system is responsible for the process control and data processing of the entire verification device, and can automatically adjust the actions of the mechanical arm and the verification platform according to the data feedback from the sensor. The verification platform provides the environment and interface required for the verification of the gas relay, including the oil circuit system, the gas circuit system, etc.

[0053] In this embodiment, the gas relay is verified by a telescopic mechanical arm, which enters through the opening of the oil circuit system, adjusts the spring tension F and the distance L of the weight to the fulcrum cThe control system calculates the ideal tension of the spring according to the flow rate data of the flow rate sensor and the preset heavy gas set value, and sends an instruction to the mechanical arm for adjustment; or the control system calculates the ideal distance of the weight to the fulcrum according to the oil discharge volume data of the liquid level sensor and the preset light gas set value, and sends an instruction to the mechanical arm for adjustment. Specifically, please refer to Figure 3 In the embodiment, the gas relay is fixed on the calibration table, and the oil passage openings at both ends are connected to the oil passage system of the calibration table, which includes oil tanks on both sides and an oil tank for storage, and the mechanical arm is arranged in the oil tanks on both sides. After the oil pump is started, the oil passage system and the gas relay are filled with oil flow, and the mechanical arm can extend into the gas relay through the connected oil passage pipeline to operate and adjust.

[0054] During the heavy gas set value adjustment process, the spring tension F and the force F oil of the baffle on the oil flow are in a balance relationship. When the oil flow speed increases, the force F oil of the oil flow on the baffle increases. According to the principle of fluid mechanics, the force of the oil flow on the baffle is proportional to the square of the oil flow speed, so the formula is established as follows:

[0055]

[0056] In the formula,

[0057] C d is the resistance coefficient of the baffle, which is related to the shape of the baffle and the characteristics of the oil flow, and generally has a value range of 0.5-1.2;

[0058] ρ is the density of the transformer oil, and the unit is kg / m 3 .

[0059] A is the effective force area of the baffle, and the unit is m 2 .

[0060] k is the spring stiffness, and the unit is N / mm;

[0061] δ is the pre-stretching amount of the spring, and the unit is mm.

[0062] In the balanced state, the spring tension F and the force F oil of the baffle on the oil flow are equal, the locking nut is loosened by the mechanical arm, the stretching amount δ of the spring is adjusted, the spring tension F is changed, the flow rate action value v d is changed, and it is ensured that v d falls within the range of v z .

[0063] Therefore, in the heavy gas setting adjustment process, the mechanical arm adjusts the spring tension through the adjusting rod to change the heavy gas action value. The control system instructs the oil circuit system to adjust the oil flow rate, starting from the preset oil flow rate and gradually increasing to the preset heavy gas setting value. The flow rate sensor synchronously monitors the oil flow rate at the gas relay inlet. When the baffle is deflected to the limit position and the heavy gas reed contact is attracted to trigger the signal, the flow rate data monitored by the flow rate sensor at this time is recorded as the actual heavy gas action value. d , as the heavy gas actual action value.

[0064] The specific operation steps are as follows: first, the mechanical arm is positioned to the locking nut of the adjusting rod, and the locking nut and the adjusting nut are loosened in turn, so that the adjusting rod can move freely. Second, the spring is stretched outward to increase the heavy gas setting value, or compressed inward to decrease the heavy gas setting value. After adjusting to the appropriate position, the adjusting nut is tightened first, and then the locking nut is fixed and tightened. The process is shown in Figure 3 .

[0065] After obtaining the actual heavy gas action value, the control system controls the oil circuit system to restore the initial flow rate and stabilize for a preset period of time. The verification is repeated at least 2 times, and at least 3 groups of actual heavy gas action values are obtained. The control system calculates the deviation value of each group of action values, compares the deviation value fluctuation range with the preset heavy gas setting value, and evaluates the heavy gas performance stability in combination with the baffle sticking state recorded by the sticking detection.

[0066] The deviation value refers to the difference between the actual heavy gas action values obtained by multiple detections, which is the difference between the maximum value and the minimum value. Because the relay may have a large difference in multiple detection results due to component aging, even if a single detection meets the standard, the deviation value of the present embodiment is used to quantify the fluctuation degree. The larger the deviation value, the more unstable the performance.

[0067] In addition, for spring fatigue detection, the operation of the present embodiment is to finely adjust the tension applied to the spring by the mechanical arm, and the force sensor monitors the real-time change of the spring tension.

[0068] Based on the preset tension parameter interval, the slope change of the actual tension curve is calculated in real time:

[0069] If the slope fluctuation is within the preset tension parameter interval: determine that the spring state is normal, and continue to verify;

[0070] If the slope gradually decreases, it is determined that the spring is fatigued, and the verification strategy is automatically adjusted. The verification number of the heavy gas setting value is increased to at least 4 repeated verifications. If the deviation of the results of multiple verifications is less than the preset threshold, the verification is continued, and the spring fatigue risk is marked in the report. If the deviation is greater than the preset threshold, it is prompted to disassemble and replace the spring.

[0071] The fatigue detection logic is that the mechanical arm applies periodic tension to the spring, and the force sensor detects that when the slope fluctuation is maintained within the preset interval (k≈constant), the spring elasticity is stable, the force transmission is uniform, and the regular calibration process can continue; if the slope gradually decreases (k continues to decrease), the force transmission will gradually weaken, indicating that the spring elasticity continues to decay with the increase of impact times, and the spring should be replaced.

[0072] In the light gas setting adjustment process, the balance relationship formula of the float and the weight lever is:

[0073] F d ·L f =mg·L c

[0074] In the formula,

[0075] F d is the reaction force of the oil to the float force, with the unit of N;

[0076] L f is the length of the float arm (fixed value), with the unit of m;

[0077] m is the mass of the weight (fixed value), with the unit of kg;

[0078] g is the acceleration of gravity, with the unit of m / s 2 ;

[0079] δ is the spring pre-tensioning amount, with the unit of mm;

[0080] L c is the distance from the weight to the fulcrum, with the unit of m.

[0081] By loosening the fixed nut with the mechanical arm, the distance L c from the weight to the fulcrum is adjusted, and the buoyancy F d of the float will change accordingly. When L c increases, F d increases accordingly, and the light gas reed switch will only be attracted when the float drops to a deeper position, causing the light gas action value to increase; on the contrary, when L c decreases, the corresponding light gas action value decreases.

[0082] The principle of light gas verification is to fill the gas relay with oil first, then slowly unload the oil, and the float will gradually descend with the oil surface position (decrease in buoyancy) to a certain position, and the light gas dry reed contact will be attracted, and an alarm signal will be sent. Therefore, in this embodiment, the mechanical arm adjusts the distance of the weight from the center point to change the light gas action value. The specific operation steps are as follows: first, the mechanical arm positions the fixed nut of the weight and loosens it to ensure that the weight can move freely. Then, according to the light gas setting value adjustment requirement, the mechanical arm rotates the weight to adjust the distance of the weight from the center point. After adjusting to the appropriate position, tighten the fixed nut. The specific operation process is shown in Figure 4 .

[0083] After obtaining the actual action value of light gas, the control system controls the oil circuit system to restore the initial flow rate and stabilize for a preset time, and the verification process is repeated at least 2 times to obtain at least 3 groups of actual action values of light gas; the control system calculates the deviation value of each group of action values, compares the deviation value fluctuation range with the preset light gas setting value, and evaluates the light gas performance stability in combination with the sticking detection state if the deviation value is within the threshold range.

[0084] In addition, the control system of this embodiment adopts an adaptive anti-saturation PID control algorithm, which can automatically adjust the control parameters according to the real-time collected data to ensure the stability and response speed of the system. The formula of the control algorithm is as follows:

[0085]

[0086] where,

[0087] u(t) is the control output;

[0088] K p , K i , and K d are the proportional, integral, and derivative control parameters, respectively;

[0089] e(t) is the system error;

[0090] η and Δ are anti-saturation parameters for preventing integral saturation;

[0091] sat is a saturation function.

[0092] The parameter dynamic range is set as: K p ∈ [0.8, 1.0], and η = 0.02. By adjusting the control parameters in real time, this algorithm can effectively cope with various dynamic changes in the gas relay performance detection process, ensuring the accuracy and stability of the verification process.

[0093] To verify the above method, two types of gas relay (specifications as shown in Table 1) are selected as experimental objects, and the traditional calibration method and the detection method and device of the embodiment are used for calibration respectively. The calibration results, calibration time and error and other indicators are compared. The specific comparison method is as follows: first, divide the two types of relays into two groups evenly, 30 units in each group, and under the same environmental conditions, the experimental gas relay is calibrated in turn by traditional calibration and automatic detection device calibration. The traditional group mainly adjusts the heavy gas and light gas setting value by professional personnel according to the conventional process; the automatic group adjusts the heavy gas and light gas setting value according to the method steps proposed in this paper.

[0094] Table 1 Specific parameters of experimental objects

[0095] Serial number Relay model Number (units) Flow rate setting value vz (m / s) Gas volume setting value Vz (ml) Oil temperature (°C) 1 QJ4-25 30 1 200～300 25～40 2 QJ4-80 30 0.7～1.2 250～300 25～40

[0096] Through the comparison of the calibration results, it is found that the consistency of the calibration results of the method and device proposed in this paper and the traditional calibration method is good, and the error is within the allowable range, which indicates that the calibration results of the method and device are accurate and reliable. See Table 2 for details.

[0097] Table 2 Comparison of detection accuracy (n=60)

[0098] Index Traditional group Automated group Promotion rate Light gas error 2.8％±0.7％ 0.41％±0.05％ 85.4％ Heavy gas error 3.1％±0.6％ 0.38％±0.03％ 87.7％ Sealing qualification rate 92.0％ 100％ 8.0％

[0099] Compared with the traditional method, the proposed method and device significantly shorten the calibration time and improve the calibration efficiency. For example, the traditional method takes about 40 minutes to calibrate one gas relay, while the method and device proposed in this paper only takes about 10 minutes. See Table 3 for details.

[0100] Table 3 Comparison of detection efficiency (n=60)

[0101] Process Traditional time consumption (min) Automated time consumption (min) Saving ratio Disassembly / assembly 15.2 2 80.3％ Light gas adjustment 10.5 2.8 73.3％ Heavy gas adjustment 12.3 3.5 71.5％ Total time consumption per unit 38.0±3.1 9.3±0.9 75.5％

[0102] In repeated experiments, the device has stable performance and no failure or abnormal situation occurs, and the repeated test precision is high and the reliability is strong.

[0103] On the other hand, the embodiment also provides a performance detection and setting test system of a gas relay, which is used to execute the performance detection method of the gas relay, and includes:

[0104] The mechanical arm, flow rate sensor, force sensor, displacement sensor, liquid level sensor control system and calibration table;

[0105] The mechanical arm is used to adjust the light gas setting value and the heavy gas setting value;

[0106] The flow rate sensor is installed in the oil circuit of the calibration table, the force sensor is installed on the force transmission path of the spring, the displacement sensor is installed on the execution end of the mechanical arm, and the liquid level sensor is installed on the inner wall of the gas relay; wherein, the control system is in communication connection with the above-mentioned sensors respectively;

[0107] The calibration table comprises an oil circuit system, a gas circuit system and a sealing test device.

[0108] Through the above scheme, the method and device of the embodiment can accurately and quickly complete the performance test of the gas relay, significantly improve the calibration efficiency and accuracy, reduce human error, avoid the damage risk of disassembling the relay, and have good stability and reliability. The research provides an effective solution for the field of power equipment detection, and has important significance for ensuring the safe and stable operation of the power system. In the future, the performance of the device will be continuously optimized, and its functions will be expanded to adapt to the detection needs of more types of power equipment, and the automation level of power equipment detection will be further improved.

[0109] The embodiments of the present application are described in detail above. Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, it is described more simply, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A method for detecting and setting the performance of a gas relay, characterized in that, The application relates to a calibration platform for providing a required environment and interface for calibrating a gas relay, the calibration platform comprising an oil circuit system and a gas circuit system; wherein the oil circuit system is provided with a flow rate sensor and a force sensor in the force transmission path of a spring, and a liquid level sensor is arranged on the inner wall of the gas relay; the calibration platform further comprises a mechanical arm for fine adjustment of the gas relay, and the execution end of the mechanical arm is provided with a displacement sensor. A preset flow rate oil flow is introduced through the oil circuit system, and the relay is filled with oil and then slowly discharged; the displacement sensor sequentially monitors the displacement smoothness of the baffle and the upper edge of the float and performs jam detection. The heavy gas setting value calibration and the light gas setting value calibration are respectively performed; wherein The heavy gas setting value calibration is detected and verified by the flow rate sensor and the force sensor, and the light gas setting value calibration is detected by the liquid level sensor. The control system is used for recording detection data and jam state and generating a detection report containing performance evaluation. The jam detection comprises:

2. The performance detection setting test method of a gas relay according to claim 1, characterized in that, A preset flow rate oil flow is introduced into the relay inlet, and the displacement sensor is used to monitor and record the upper edge displacement during the deflection process of the internal baffle; After the gas relay is filled with oil, the oil is slowly discharged, and the displacement sensor is used to monitor and record the upper edge displacement during the descent process of the float; The monitored displacement-time curve is compared with a preset normal displacement threshold curve; if a stagnation section or a fluctuation amplitude exceeding the normal threshold range is found in the displacement-time curve, it is determined that there is a jam risk. If it is determined that there is a jam risk, the control system instructs the oil circuit system to output a pulse type oil flow, and an impact force is formed by the periodic fluctuation of the oil flow rate within a preset range to flush the baffle deflection center shaft, the float and the heavy hammer center point multiple times; 3. The performance detection setting test method of a gas relay according to claim 2, characterized in that, After the flushing is completed, the preset flow rate oil flow is introduced again, the relay is filled with oil and then slowly discharged, and the displacement sensor monitors the displacement of the baffle and the upper edge of the float again; if the displacement-time curve returns to the normal threshold range, the current jam state is recorded and subsequent calibration is performed. The heavy gas setting value calibration comprises:

4. The performance detection setting test method of a gas relay according to claim 1, characterized in that, The heavy gas setting value calibration further comprises: The control system instructs the oil circuit system to adjust the oil flow rate, gradually increasing it from a preset rate to a preset heavy gas setpoint. Simultaneously, the flow rate sensor monitors the oil flow rate at the gas relay inlet. When the baffle deflects to its limit position and the heavy gas reed contact engages to trigger the signal, the flow rate data v monitored by the flow rate sensor at this moment is recorded. d This serves as the actual action value for heavy gas.

5. The method of claim 4, wherein the method further comprises: determining the performance of the gas relay by measuring the pressure of the gas relay. After the actual action value of the heavy gas is obtained, the control system controls the oil circuit system to restore the initial flow rate and stabilize for a preset time length, the calibration is repeated at least twice, and at least three groups of actual action values of the heavy gas are obtained; the control system calculates the deviation values of the action values, compares the fluctuation range of the deviation values with a preset heavy gas setting value, and evaluates the performance stability of the heavy gas in combination with the baffle jam state recorded by the jam detection. The heavy gas setting value calibration further comprises:

6. The performance detection setting test method of a gas relay according to claim 5, characterized in that, The mechanical arm applies a periodic pulling force to the spring, and the slope change of the actual pulling force curve is calculated in real time based on a preset pulling force parameter interval; If the slope fluctuation is within the preset pulling force parameter interval, it is determined that the spring state is normal, and the calibration is continued; If the slope gradually decreases, it is determined that the spring is fatigued, the calibration strategy is automatically adjusted, the calibration times of the heavy gas setting value are increased to at least four repeated calibrations, if the deviation of the results of multiple calibrations is less than a preset threshold value, the calibration is continued, and the spring fatigue risk is marked in the report; If the deviation is greater than the preset threshold value, it is prompted that the spring needs to be disassembled and replaced. ​ 7. The performance detection and setting test method of a gas relay according to claim 1, characterized in that, The light gas fixed value verification comprises: After the control system instructs the oil circuit system to fill the relay with oil, the control system opens the air release valve to slowly release the oil. The liquid level sensor monitors the change in the oil level position. When the float drops to a certain position with the oil level, the light gas reed switch contact is attracted to trigger a signal, and the volume of oil discharged from the relay at this time is recorded as the actual action value of the light gas.

8. The performance detection setting test method of a gas relay according to claim 7, characterized in that, The light gas fixed value verification further comprises: After obtaining the actual action value of the light gas, the control system controls the oil circuit system to continue to fill the relay with oil, and the verification process is repeated at least twice to obtain at least three groups of actual action values of the light gas. The control system calculates the deviation values of each group of action values, compares the fluctuation range of the deviation values with the preset fixed value of the light gas, and evaluates the stability of the light gas performance if the deviation values are within the threshold range, in combination with the jamming state of the float recorded by the jamming detection.

9. A performance detection setting test system of a gas relay for executing the performance detection method of the gas relay according to any one of claims 1 to 8, characterized by Comprise: Mechanical arm, flow rate sensor, force sensor, displacement sensor, liquid level sensor, control system and verification table; The mechanical arm is used for heavy gas action value adjustment and light gas action value adjustment; The flow rate sensor is installed in the oil circuit of the verification table, the force sensor is installed on the force transmission path of the spring, the displacement sensor is installed at the execution end of the mechanical arm, and the liquid level sensor is installed on the inner wall of the gas relay; wherein the control system is respectively connected with the above-mentioned sensors in communication; The verification table comprises an oil circuit system and a gas circuit system.

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