Relay detection method and equipment

Abstract

The present invention discloses a relay detection method and device, which relates to the field of control equipment detection technology, and the main purpose is to solve the problem of low relay detection efficiency. It mainly includes connecting the relay to be tested to the relay detection device through a matching relay base; the relay detection device responds to the detection start instruction, and supplies and cuts off power to the relay to be tested according to the preset power supply duration, preset power-off duration and preset power supply times; in the process of supplying and cutting off power to the relay to be tested, the contact resistance measurement value of the relay to be tested is collected; the detection result of the relay to be tested is determined according to the contact resistance measurement value, and the detection result includes normal state, abnormal state and close inspection state. It is mainly used to detect the contact state of the relay.

Description

Technical Field

[0001] The present invention relates to the technical field of control device detection, and in particular to a relay detection method and device. Background Art

[0002] Relays are essential devices for control circuits and are widely used in various factories. They have simple functions and high reliability, and can be used reliably in various environments on site. However, as the years of use increase, the contact resistance of the relay contacts will continue to increase under the long-term influence of humidity, high temperature, overcurrent and other use environments, causing the relay to break, and the control circuit cannot be controlled, which in turn affects the control of the on-site equipment.

[0003] At present, the inspection of relays in the existing operation and maintenance environment is usually carried out by workers using an ohmmeter to measure the resistance of the relay contacts one by one, and record and analyze the measured resistance data. The inspection takes a long time, resulting in low relay inspection efficiency. The large number of relay devices in the control loop cannot meet the timeliness requirements for maintenance and troubleshooting. Summary of the invention

[0004] In view of this, the present invention provides a relay detection method and device, the main purpose of which is to solve the problem of low resistance detection efficiency of existing relay contacts.

[0005] According to one aspect of the present invention, there is provided a relay detection method, comprising:

[0006] Connect the relay to be tested to the relay testing equipment through the matching relay base;

[0007] The relay detection device responds to the detection start instruction to supply and disconnect power to the relay to be tested according to the preset power supply duration, the preset power off duration and the preset power supply times;

[0008] In the process of supplying and disconnecting power to the relay to be tested, collecting the contact resistance measurement value of the relay to be tested;

[0009] The detection result of the relay to be tested is determined according to the contact resistance measurement value, and the detection result includes a normal state, an abnormal state and a close inspection state.

[0010] Further, determining the detection result of the relay to be tested according to the contact resistance measurement value includes:

[0011] When the contact resistance measurement value does not meet the preset judgment condition, retest and power off the relay to be detected according to the retest power supply times, and the retest power supply times are greater than the preset power supply times;

[0012] In the process of powering on and off the relay to be tested, collecting the re-measured value of the contact resistance of the relay to be tested;

[0013] The detection result of the relay to be tested is determined according to the contact resistance measurement value and the contact resistance re-measurement value.

[0014] Furthermore, the method further comprises:

[0015] In the case that any of the contact resistance re-measured values ​​is greater than the critical resistance, determining the number of critical resistance values ​​greater than the critical resistance value in the contact resistance measurement value and the contact resistance re-measured value;

[0016] If the critical resistance value quantity is greater than or equal to a first quantity threshold, determining that the detection result is in an abnormal state;

[0017] If the critical resistance value quantity is greater than a second quantity threshold value and less than the first quantity threshold value, determining that the detection result is a close inspection state;

[0018] If the critical resistance value is less than or equal to the second quantity threshold, the detection result is determined to be in a normal state.

[0019] Further, the method of determining the detection result of the relay to be tested based on the contact resistance measurement value and the contact resistance re-measurement value further includes:

[0020] In the case that all the contact resistance re-measured values ​​are less than or equal to the critical resistance, obtaining the historical average resistance of the relay to be tested, and calculating the total average resistance of the contact resistance measurement value and the contact resistance re-measured value;

[0021] If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state;

[0022] If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

[0023] Further, the method of determining the detection result of the relay to be tested according to the contact resistance measurement value further includes:

[0024] Calculating a difference between the contact resistance measurement value and a first resistance threshold value;

[0025] In the case where the corresponding differences of all the contact resistance measurement values ​​are negative, determining that the contact resistance measurement value meets the normal determination condition, and determining the detection result as a normal state;

[0026] When the corresponding difference of any of the contact resistance measurement values ​​is positive, if the mean of the difference is less than zero and the standard deviation of the difference is less than a first standard deviation threshold, it is determined that the contact resistance measurement value meets the normal judgment condition and the detection result is determined to be in a normal state.

[0027] Further, the method of determining the detection result of the relay to be tested according to the contact resistance measurement value further includes:

[0028] If the standard deviation of the difference is greater than the second standard deviation threshold, or any of the contact resistance measurements is greater than the second resistance threshold, it is determined that the contact resistance measurement meets the abnormality determination condition, and the detection result is determined as an abnormal state.

[0029] Furthermore, before connecting the relay to be tested to the relay detection device through a matching relay base, the method further includes:

[0030] Connecting a 0 ohm relay to the relay detection device and collecting a first verification resistance value;

[0031] Connecting a standard resistance relay to the relay detection device and collecting a second verification resistance value;

[0032] If the first verification resistance value is 0 ohms, and the second verification resistance value matches the resistance value of the standard resistance relay, then determining that the relay detection device can be used to perform the detection of the relay to be tested;

[0033] If the first verification resistance value is not equal to 0 ohms, or the second verification resistance value does not match the resistance value of the standard resistance relay, then determining that the relay detection device cannot be used to perform the detection of the relay to be tested;

[0034] Wherein, during the collection process of the first verification resistance value and the second verification resistance value, the 0 ohm relay and the standard resistance relay are in a power-off state.

[0035] According to another aspect of the present invention, there is provided a relay detection device, comprising:

[0036] The relay detection device is used to perform the relay detection method according to any one of claims 1 to 7, and the relay detection device includes a detection interface, an internal power supply, an ohmmeter and a power supply and power failure control module;

[0037] The detection interface includes a first interface connected to the coil power supply wiring position corresponding to the relay base and a second interface connected to the contact wiring position corresponding to the relay base; the first interface is electrically connected to the first output end of the internal power supply, and the control component of the power supply and power failure control module is connected in series between the first output end of the internal power supply and the first interface; the second interface is electrically connected to the ohmmeter measurement contact, and the second output end of the internal power supply is electrically connected to the power supply end of the ohmmeter;

[0038] The detection interface is used to connect to a relay base that matches the relay to be detected;

[0039] The internal power supply is used to supply power to the relay to be detected and the ohmmeter;

[0040] The ohmmeter is used to collect the contact resistance measurement value and the contact resistance re-measurement value of the relay to be tested;

[0041] The power supply and power failure control module is used to determine the detection result of the relay to be tested according to the contact resistance measurement value.

[0042] Furthermore, the power supply and power off control module is specifically used to retest and supply and cut off power to the relay to be tested according to the number of retest power supplies when the contact resistance measurement value does not meet the preset judgment condition, and the number of retest power supplies is greater than the preset number of power supplies; in the process of supplying and cutting power to the relay to be tested, collect the contact resistance remeasurement value of the relay to be tested; determine the detection result of the relay to be tested based on the contact resistance measurement value and the contact resistance remeasurement value.

[0043] Furthermore, the power supply and off control module is specifically used to determine the number of critical resistance values ​​greater than the critical resistance value in the contact resistance measurement value and the contact resistance remeasurement value when any of the contact resistance remeasurement values ​​is greater than the critical resistance value; if the number of critical resistance values ​​is greater than or equal to a first quantity threshold, the detection result is determined to be in an abnormal state; if the number of critical resistance values ​​is greater than a second quantity threshold and less than the first quantity threshold, the detection result is determined to be in a close inspection state; if the number of critical resistance values ​​is less than or equal to the second quantity threshold, the detection result is determined to be in a normal state.

[0044] Furthermore, the power supply and power failure control module is specifically used to obtain the historical average resistance of the relay to be tested, and calculate the total average resistance of the contact resistance measurement value and the contact resistance re-measurement value, when all the contact resistance re-measurement values ​​are less than or equal to the critical resistance value;

[0045] If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state;

[0046] If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

[0047] Furthermore, the power supply and power failure control module is specifically used to calculate the difference between the contact resistance measurement value and the first resistance threshold;

[0048] In the case where the corresponding differences of all the contact resistance measurement values ​​are negative, determining that the contact resistance measurement value meets the normal determination condition, and determining the detection result as a normal state;

[0049] When the corresponding difference of any of the contact resistance measurement values ​​is positive, if the mean of the difference is less than zero and the standard deviation of the difference is less than a first standard deviation threshold, it is determined that the contact resistance measurement value meets the normal judgment condition and the detection result is determined to be in a normal state.

[0050] Furthermore, the power supply and off control module is specifically used to determine that the contact resistance measurement value meets the abnormal judgment condition and determine the detection result as an abnormal state if the standard deviation of the difference is greater than a second standard deviation threshold, or any of the contact resistance measurement values ​​is greater than a second resistance threshold.

[0051] Further, the relay detection device also includes a 0 ohm relay and a standard resistance relay;

[0052] The 0 ohm relay is a short-circuit relay equipped with a relay base, and the 0 ohm relay is used to zero the relay detection device;

[0053] The standard resistance relay is a relay equipped with a relay base and having a standard resistor connected in series between contacts. The standard resistance relay is used to calibrate the relay detection device.

[0054] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0055] The present invention provides a relay detection method and device. Compared with the prior art, the embodiment of the present invention first connects the relay to be tested to the relay detection device through a matching relay base; the relay detection device responds to the detection start instruction to supply and disconnect power to the relay to be tested according to a preset power supply time, a preset power off time and a preset number of power supplies; in the process of supplying and disconnecting power to the relay to be tested, the contact resistance measurement value of the relay to be tested is collected; the detection result of the relay to be tested is determined according to the contact resistance measurement value, and the detection result includes a normal state, an abnormal state and a close inspection state. The number of detection times is automatically controlled by the relay detection device, and the relay detection device and the relay to be tested are stably connected based on the relay base, thereby avoiding manual measurement and analysis of the relay state, greatly reducing the time consumption of detection, and reducing the labor cost of detection. At the same time, the precise analysis by the relay detection device improves the granularity of the detection result on the basis of ensuring the accuracy of the detection, thereby greatly improving the efficiency of relay detection.

[0056] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0058] Figure 1 A flow chart of a relay detection method provided by an embodiment of the present invention is shown;

[0059] Figure 2 Another relay detection method flow chart provided by an embodiment of the present invention is shown;

[0060] Figure 3 A block diagram of a relay detection device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0061] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0062] Aiming at the problem of low relay detection accuracy. The embodiment of the present invention provides a relay detection method, such as Figure 1 As shown, the method includes:

[0063] 101. Connect the relay to be tested to the relay testing equipment through the matching relay base.

[0064] In an embodiment of the present invention, the relay to be tested is a relay that needs to be tested, for example, a relay that needs to be checked in a fault control loop, or a relay that needs to be tested daily in daily inspections. The type of relay is any relay containing contacts, for example, an electromagnetic relay, a solid-state relay, etc., which is not specifically limited in the embodiment of the present invention. The relay detection device is a device including an internal power supply, an ohmmeter, a relay connection interface (detection interface), a power switch, a measurement switch, and a display screen. The detection interface includes a first interface connected to the coil power supply wiring position corresponding to the relay base and a second interface connected to the contact wiring position corresponding to the relay base; the first interface is electrically connected to the first output end of the internal power supply, and the control component of the power supply and power failure control module is connected in series between the first output end of the internal power supply and the first interface. That is, the first interface connected to the relay power supply end in the detection interface is connected to the first output end of the internal power supply via the control component of the power supply and power failure control module, so that the power supply and power failure control module can control the power supply on and off of the relay to be tested. The measuring contacts (test probe ends) of the ohmmeter are respectively connected to the two second interfaces to measure the resistance value when the contacts are closed. The second output terminal of the power supply is electrically connected to the power supply terminal of the ohmmeter. The internal power supply provides 24V DC power to the ohmmeter while supplying power to the relay to be detected.

[0065] Before measuring the relay to be tested, connect the relay to be tested to the relay detection device through the relay base that matches it. By connecting the relay base to the relay detection device, the test point of the ohmmeter can be fixed, which is more stable than the conventional manual test pen test, thereby obtaining a more accurate measured resistance value. Since the interface positions of the contacts and power supply terminals of different relays are slightly different, by connecting the relay base that matches the relay to the detection interface of the relay detection device, the relay detection device can measure different relays through the relay base that matches different relays, thereby ensuring the scope of application of the relay detection device.

[0066] 102. The relay detection device responds to the detection start instruction to supply and disconnect power to the relay to be tested according to a preset power supply duration, a preset power off duration, and a preset number of power supplies.

[0067] In an embodiment of the present invention, the relay detection device also includes a power supply and power off control module, which can be a control loop composed of a time delay relay and a register, or a control loop composed of a processor and a time delay relay, so as to realize the control of the internal power supply to supply power to and power off the relay to be tested according to a fixed delay. When the power switch of the relay detection device is turned on, when the operator presses the start detection switch of the relay detection device, the delay relay in the relay detection device obtains the preset power supply duration, the preset power off duration and the preset power supply times from the register or the processor, and controls the power supply to the relay to be tested according to the power supply times. The preset power supply duration, the preset power off duration and the preset power supply times can be customized according to time operation experience or on-site needs, and the embodiment of the present invention does not make specific limitations.

[0068] 103. In the process of supplying and disconnecting power to the relay to be tested, collect a contact resistance measurement value of the relay to be tested.

[0069] In the embodiment of the present invention, the internal power supply of the relay detection device supplies and disconnects power to the relay to be detected, and the test contact of the relay to be detected is closed or disconnected (the normally open contact is closed when power is supplied, and the normally closed contact is closed when power is disconnected). The resistance value in the closed state of the contact is measured by the ohmmeter of the relay detection device to obtain the contact resistance measurement value.

[0070] 104. Determine a detection result of the relay to be tested according to the contact resistance measurement value.

[0071] In an embodiment of the present invention, the detection result includes an abnormal state, a normal state, and a close inspection state. The contact resistance measurement value includes the resistance value measured each time the contact is closed. According to the maximum value and the total average resistance value of multiple resistance values, the detection result of the relay to be tested can be determined. For example, if the total average resistance value of all resistance values ​​is greater than 10 ohms, or the maximum resistance value is greater than 20 ohms, it indicates that the resistance value has reached a level that can cause a short circuit, then the detection result of the relay to be tested is judged to be an abnormal state and needs to be repaired or replaced. For example, if the total average resistance value of all resistance values ​​is less than 1 ohm, or the maximum resistance value is less than 3 ohms, then the detection result of the relay to be tested is judged to be a normal state. Of course, there are also situations between the above two situations. For example, if one resistance value is 8 ohms and the other resistance values ​​are between 1 and 3 ohms, it is impossible to accurately judge the state of the relay to be tested, and it is not clear whether 8 ohms is a measurement error or a contact problem. Further retesting is required, and then the test result of the relay to be tested is determined based on the retested data and the currently measured data. If it is still not determined to be normal or abnormal based on the retested state, for example, the resistance value is large, but it has not reached the level of short circuit, it is necessary to determine that it is in a close inspection state, that is, the relay is inspected more frequently than the normal state. The relay detection device is equipped with a display screen and an indicator light. The display screen can display the measured resistance value each time during the measurement process, and display the corresponding mark of the final test result when the test is completed, for example, Usual represents normal, Unusual represents abnormal, and Check represents the close inspection state. The indicator light is used to indicate the power supply and test status. For example, after the switch power is pressed, a red power-on indicator light will be displayed to indicate; after the measurement switch is pressed, a blue circuit connection indicator light will be displayed to indicate, etc. The embodiment of the present invention does not make specific limitations.

[0072] By using the relay detection equipment to detect the side relay, the automatic multiple measurements of the relay contact resistance are realized, avoiding the manual measurement and recording of each measurement data, greatly reducing the time for testing and judgment, and at the same time, ensuring the accuracy of the measurement, thereby effectively improving the detection efficiency of the relay.

[0073] In an embodiment of the present invention, for further explanation and limitation, as Figure 2 As shown, the step of determining the detection result of the relay to be tested according to the contact resistance measurement value includes:

[0074] 201. When the contact resistance measurement value does not satisfy a preset determination condition, retest and cut off power to the relay to be detected according to the number of retest power supply times.

[0075] 202. In the process of powering on and off the relay to be tested, collect a re-measured value of the contact resistance of the relay to be tested.

[0076] 203. Determine a detection result of the relay to be tested according to the contact resistance measurement value and the contact resistance re-measurement value.

[0077] In an embodiment of the present invention, the preset judgment condition includes an abnormal judgment condition and a normal judgment condition. When the measured contact resistance value is insufficient to obtain a detection result according to the preset judgment condition, the relay to be tested is powered on, powered off and measured again according to the number of retest power supplies to obtain more measured resistance values ​​for evaluating the detection result of the relay to be tested. Among them, the number of retest power supplies is greater than the preset number of power supplies, that is, the number of contact closures during the retest is greater than the number of contact closures during the first measurement. Since the data collected under the preset number of power supplies is not sufficient to determine the state of the relay to be tested, it indicates that the contact resistance of the relay to be tested is not very stable, so more measured resistance values ​​are required as a basis for judgment.

[0078] It should be noted that the power supply duration in the retest process uses the preset power supply duration, and the power-off duration uses the preset power-off duration. First, measure the contact resistance of the relay to be tested with the least number of measurements. If the test result can be determined, the number of tests can be greatly reduced and the test speed can be improved. If the test result cannot be determined, further retesting is performed to ensure the accuracy of the test while improving the test efficiency.

[0079] In one embodiment of the present invention, for further explanation and limitation, determining the detection result of the relay to be tested according to the contact resistance measurement value and the contact resistance re-measurement value includes:

[0080] In the case that any of the contact resistance re-measured values ​​is greater than the critical resistance, determining the number of critical resistance values ​​greater than the critical resistance value in the contact resistance measurement value and the contact resistance re-measured value;

[0081] If the critical resistance value quantity is greater than or equal to a first quantity threshold, determining that the detection result is in an abnormal state;

[0082] If the critical resistance value quantity is greater than a second quantity threshold value and less than the first quantity threshold value, determining that the detection result is a close inspection state;

[0083] If the critical resistance value is less than or equal to the second quantity threshold, the detection result is determined to be in a normal state.

[0084] In an embodiment of the present invention, after obtaining the contact resistance re-measurement value, the contact resistance measurement value and the contact resistance re-measurement value are compared with the critical resistance value in turn, and the resistance values ​​greater than the critical resistance value are counted to obtain the number of critical resistance values. Among them, the critical resistance value is a resistance value close to the abnormal resistance value, for example, the abnormal resistance value is 15 ohms, and the critical resistance value is 13 ohms. The first quantity threshold is a value greater than 1 / 2 of the total number of measurements, and the second quantity threshold is a value less than 1 / 10 of the total number of measurements. For example, if the total number of contact resistance measurement values ​​and contact resistance re-measurement values ​​is 30, the first quantity threshold can be 20; the second quantity threshold can be 3. If the number of critical resistance values ​​is greater than or equal to the first quantity threshold, it indicates that more than half of the measured resistances exceed the critical resistance value, and the contact reliability of the relay cannot meet the requirements, then the detection result is determined to be an abnormal state. If the number of critical resistance values ​​is between the first quantity threshold and the second quantity threshold, it indicates that the relay can continue to be used, but continuous inspection is required to ensure that problems are discovered in a timely manner, then the detection result is determined to be a close inspection state. If the critical resistance value is less than or equal to the second quantity threshold, it indicates that the value exceeding the critical value may be a measurement error, and the relay can be used normally, and the detection result is determined to be normal. It should be noted that the critical resistance value can characterize the situation where the abnormal resistance value is expected to be exceeded, and the state of the relay to be tested can be accurately determined according to the proportion of the critical resistance value in the measured resistance value.

[0085] In one embodiment of the present invention, for further explanation and limitation, the step of determining the detection result of the relay to be tested based on the contact resistance measurement value and the contact resistance re-measurement value further includes:

[0086] In the case that all the contact resistance re-measured values ​​are less than or equal to the critical resistance, obtaining the historical average resistance of the relay to be tested, and calculating the total average resistance of the contact resistance measurement value and the contact resistance re-measured value;

[0087] If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state;

[0088] If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

[0089] In the embodiment of the present invention, due to the customer's fixed value requirements and other reasons, the contact resistance of some relays to be tested will be too large when they leave the factory, resulting in the contact resistance re-measurement value and the contact resistance measurement value being less than or equal to the critical resistance value, rather than being caused by contact oxidation. In view of this situation, the historical average resistance of the relay to be tested is obtained, and the total average resistance of all measured resistances (contact resistance measurement value and contact resistance re-measurement value) is calculated. If the difference between the historical average resistance and the total average resistance is small (less than the average difference threshold), it indicates that the contact resistance of the current relay to be tested is relatively large when it leaves the factory, and there will be no circuit breakage in the current control loop, and the detection result of this relay to be tested can be determined as a normal state. If the difference between the historical average resistance and the total average resistance is large (greater than the average difference threshold), it indicates that the large contact resistance of the current relay to be tested is caused by contact oxidation, and the detection result is determined as a close inspection state as a close inspection state. The historical average resistance may be the total average resistance of the contact resistance measured just after the relay to be tested is installed, or the total average resistance of the contact resistance within a period of installation, such as 3 months, 6 months, etc. The average difference threshold may be customized according to application requirements, such as 5 ohms, 3 ohms, etc. The specific value of the average difference threshold and the calculation method of the historical average resistance are not specifically limited in the embodiment of the present invention. By introducing the historical average resistance into the determination of the test result, the contact resistance of the relay to be tested itself can be excluded, thereby improving the accuracy of the test result.

[0090] In one embodiment of the present invention, for further explanation and limitation, the determining the detection result of the relay to be tested according to the contact resistance measurement value further includes:

[0091] Calculating a difference between the contact resistance measurement value and a first resistance threshold value;

[0092] In the case where the corresponding differences of all the contact resistance measurement values ​​are negative, determining that the contact resistance measurement value meets the normal determination condition, and determining the detection result as a normal state;

[0093] When the corresponding difference of any of the contact resistance measurement values ​​is positive, if the mean of the difference is less than zero and the standard deviation of the difference is less than a first standard deviation threshold, it is determined that the contact resistance measurement value meets the normal judgment condition and the detection result is determined to be in a normal state.

[0094] In an embodiment of the present invention, the normal determination condition includes the case where the corresponding differences of all the contact resistance measurement values ​​are negative, and the case where the corresponding difference of any of the contact resistance measurement values ​​is positive. When the corresponding differences of all the contact resistance measurement values ​​are negative, the relay to be tested can be directly determined to be normal. When the corresponding difference of any of the contact resistance measurement values ​​is positive, the relay to be tested can be determined to be normal only when the mean of the difference is less than zero and the standard deviation of the difference is less than the first standard deviation threshold. If the corresponding difference of all the contact resistance measurement values ​​is negative, it indicates that all the contact resistance measurement values ​​are less than the first resistance threshold, and the relay to be tested is in a normal state. When the corresponding difference of any contact resistance measurement value is not negative, that is, there is a contact resistance measurement value greater than the first resistance threshold, the average value of the difference is calculated. If the average value of the difference is less than zero, it indicates that only individual contact resistance measurement values ​​are greater than the first resistance threshold. If the standard deviation of the difference is less than the first standard deviation threshold, it indicates that the difference distribution is relatively uniform, that is, the contact resistance measurement value fluctuates little, and the relay to be tested can also be determined to be in a normal state.

[0095] In an embodiment of the present invention, for further explanation and limitation, the method further includes:

[0096] If the standard deviation of the difference is greater than the second standard deviation threshold, or any of the contact resistance measurements is greater than the second resistance threshold, it is determined that the contact resistance measurement meets the abnormality determination condition, and the detection result is determined as an abnormal state.

[0097] In an embodiment of the present invention, the second standard deviation threshold is greater than the first standard deviation threshold. If the standard deviation of the difference between the contact resistance measurement value and the first resistance threshold is greater than the second standard deviation threshold, it indicates that the contact resistance measurement value fluctuates greatly and the performance of the relay to be tested is not reliable enough, and the detection result is determined to be an abnormal state. The second resistance threshold is a resistance value that can cause a short circuit determined based on historical experience, such as 20 ohms, 15 ohms, etc. If any contact resistance measurement value is greater than the second resistance threshold, it indicates that the contact resistance of the relay to be tested may cause a short circuit, and the detection result is determined to be an abnormal state.

[0098] In one embodiment of the present invention, for further explanation and limitation, before connecting the relay to be tested to the relay detection device through a matching relay base, the method further includes:

[0099] Connecting a 0 ohm relay to the relay detection device and collecting a first verification resistance value;

[0100] Connecting a standard resistance relay to the relay detection device and collecting a second verification resistance value;

[0101] If the first verification resistance value is 0 ohms, and the second verification resistance value matches the resistance value of the standard resistance relay, then determining that the relay detection device can be used to perform the detection of the relay to be tested;

[0102] If the first verification resistance value is not equal to 0 ohms, or the second verification resistance value does not match the resistance value of the standard resistance relay, then determining that the relay detection device cannot be used to perform the detection of the relay to be tested;

[0103] In an embodiment of the present invention, a 0 ohm relay and a standard resistance relay are obtained based on the improvement of existing relays and are standard relays used to calibrate a relay detection device. During the collection process of the first verification resistance value and the second verification resistance value, the 0 ohm relay and the standard resistance relay are in a power-off state. Since the 0 ohm relay is obtained by short-circuiting the contacts on the basis of the existing relay, it does not need to be powered on and can be directly connected to the relay detection device, and the actual resistance is 0 ohms. Similarly, since the standard resistance relay is obtained by connecting a standard resistor in series between the contacts on the basis of the existing relay, when the standard resistance relay is connected to the relay detection device, it does not need to be powered on and the actual resistance is the resistance value of the standard resistor. By improving the existing relays to obtain 0 ohm relays and standard resistance relays, convenient calibration of the relay detection device can be achieved.

[0104] The present invention provides a relay detection method, and the embodiments of the present invention are as follows.

[0105] Furthermore, as a response to the above Figure 1 To implement the method shown in the figure, an embodiment of the present invention provides a relay detection device, such as Figure 3 As shown, the device includes: a detection interface 31, an internal power supply 32, an ohmmeter 33 and a power supply and power failure control module 34;

[0106] The detection interface 31 includes a first interface connected to the coil power supply wiring position corresponding to the relay base and a second interface connected to the contact wiring position corresponding to the relay base; the first interface is electrically connected to the first output end of the internal power supply 32, and the control component of the power supply and power failure control module is connected in series between the first output end of the internal power supply 32 and the first interface; the second interface is electrically connected to the measurement contact of the ohmmeter 33, and the second output end of the internal power supply 32 is electrically connected to the power supply end of the ohmmeter 33;

[0107] The detection interface 31 is used to connect to a relay base that matches the relay to be detected;

[0108] The internal power supply 32 is used to supply power to the relay to be detected and the ohmmeter;

[0109] The ohmmeter 33 is used to collect the contact resistance measurement value and the contact resistance re-measurement value of the relay to be tested;

[0110] The power supply and power failure control module 34 is used to determine the detection result of the relay to be tested according to the contact resistance measurement value.

[0111] Furthermore, the power supply and power off control module is specifically used to, when the contact resistance measurement value does not meet the preset judgment condition, retest and supply and cut off the power to the relay to be tested according to the retest power supply times, and the retest power supply times are greater than the preset power supply times; in the process of supplying and cutting off the power to the relay to be tested, collect the contact resistance remeasurement value of the relay to be tested; and determine the detection result of the relay to be tested based on the contact resistance measurement value and the contact resistance remeasurement value.

[0112] Furthermore, the power supply and off control module is specifically used to determine the number of critical resistance values ​​greater than the critical resistance value in the contact resistance measurement value and the contact resistance remeasurement value when any of the contact resistance remeasurement values ​​is greater than the critical resistance value; if the number of critical resistance values ​​is greater than or equal to a first quantity threshold, the detection result is determined to be in an abnormal state; if the number of critical resistance values ​​is greater than a second quantity threshold and less than the first quantity threshold, the detection result is determined to be in a close inspection state; if the number of critical resistance values ​​is less than or equal to the second quantity threshold, the detection result is determined to be in a normal state.

[0113] Furthermore, the power supply and power failure control module is specifically used to obtain the historical average resistance of the relay to be tested, and calculate the total average resistance of the contact resistance measurement value and the contact resistance re-measurement value, when all the contact resistance re-measurement values ​​are less than or equal to the critical resistance value;

[0114] If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state;

[0115] If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

[0116] Furthermore, the power supply and power failure control module is specifically used to calculate the difference between the contact resistance measurement value and the first resistance threshold;

[0117] In the case where the corresponding differences of all the contact resistance measurement values ​​are negative, determining that the contact resistance measurement value meets the normal determination condition, and determining the detection result as a normal state;

[0118] When the corresponding difference of any of the contact resistance measurement values ​​is positive, if the mean of the difference is less than zero and the standard deviation of the difference is less than a first standard deviation threshold, it is determined that the contact resistance measurement value meets the normal judgment condition and the detection result is determined to be in a normal state.

[0119] Furthermore, the power supply and off control module is specifically used to determine that the contact resistance measurement value meets the abnormal judgment condition and determine the detection result as an abnormal state if the standard deviation of the difference is greater than a second standard deviation threshold, or any of the contact resistance measurement values ​​is greater than a second resistance threshold.

[0120] Further, the relay detection device also includes a 0 ohm relay and a standard resistance relay;

[0121] The 0 ohm relay is a short-circuit relay equipped with a relay base, and the 0 ohm relay is used to zero the relay detection device;

[0122] The standard resistance relay is a relay equipped with a relay base and having a standard resistor connected in series between contacts. The standard resistance relay is used to calibrate the relay detection device.

[0123] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0124] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A relay detection method, characterized in that: include: Connect the relay to be tested to the relay detection device through a matching relay base, wherein the relay detection device includes a detection interface, an internal power supply, an ohmmeter and a power supply and disconnection control module; The relay detection device responds to the detection start instruction to supply and disconnect power to the relay to be tested according to the preset power supply duration, the preset power off duration and the preset power supply times; In the process of supplying and disconnecting power to the relay to be tested, collecting the contact resistance measurement value of the relay to be tested; Determine the detection result of the relay to be tested according to the contact resistance measurement value, wherein the detection result includes a normal state, an abnormal state and a close inspection state; When the measured contact resistance value is insufficient to obtain a test result according to the preset judgment condition, the relay to be tested is powered on, powered off and measured again according to the retest power supply times; When all the contact resistance re-measured values ​​are less than or equal to the critical resistance, obtaining the historical average resistance of the relay to be tested, and calculating the total average resistance of the contact resistance measurement value and the contact resistance re-measured value; If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state; If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

2. The method according to claim 1, characterized in that Determining the detection result of the relay to be tested according to the contact resistance measurement value includes: When the contact resistance measurement value does not meet the preset judgment condition, retest and power off the relay to be tested according to the retest power supply times, wherein the retest power supply times are greater than the preset power supply times; In the process of supplying and disconnecting power to the relay to be tested, collecting a re-measured value of the contact resistance of the relay to be tested; The detection result of the relay to be tested is determined according to the contact resistance measurement value and the contact resistance re-measurement value.

3. The method according to claim 2, characterized in that The step of determining the detection result of the relay to be tested based on the contact resistance measurement value and the contact resistance re-measurement value includes: In the case that any of the contact resistance re-measured values ​​is greater than the critical resistance, determining the number of critical resistance values ​​greater than the critical resistance value in the contact resistance measurement value and the contact resistance re-measured value; If the critical resistance value quantity is greater than or equal to a first quantity threshold, determining that the detection result is in an abnormal state; If the critical resistance value quantity is greater than a second quantity threshold value and less than the first quantity threshold value, determining that the detection result is a close inspection state; If the critical resistance value is less than or equal to the second quantity threshold, the detection result is determined to be in a normal state.

4. The method according to claim 2, characterized in that: The method of determining the detection result of the relay to be tested according to the contact resistance measurement value further includes: Calculating a difference between the contact resistance measurement value and a first resistance threshold value; In the case where the corresponding differences of all the contact resistance measurement values ​​are negative, determining that the contact resistance measurement value meets the normal determination condition, and determining the detection result as a normal state; When the corresponding difference of any of the contact resistance measurement values ​​is positive, if the mean of the difference is less than zero and the standard deviation of the difference is less than a first standard deviation threshold, it is determined that the contact resistance measurement value meets the normal judgment condition and the detection result is determined to be in a normal state.

5. The method according to claim 4, characterized in that The method of determining the detection result of the relay to be tested according to the contact resistance measurement value further includes: If the standard deviation of the difference is greater than the second standard deviation threshold, or any of the contact resistance measurements is greater than the second resistance threshold, it is determined that the contact resistance measurement meets the abnormality determination condition, and the detection result is determined as an abnormal state.

6. The method according to any one of claims 1 to 5, characterized in that Before connecting the relay to be tested to the relay detection device through a matching relay base, the method further includes: Connecting a 0 ohm relay to the relay detection device and collecting a first verification resistance value; Connecting a standard resistance relay to the relay detection device and collecting a second verification resistance value; If the first verification resistance value is 0 ohms, and the second verification resistance value matches the resistance value of the standard resistance relay, then determining that the relay detection device can be used to perform the detection of the relay to be tested; If the first verification resistance value is not equal to 0 ohms, or the second verification resistance value does not match the resistance value of the standard resistance relay, it is determined that the relay detection device cannot be used to perform the detection of the relay to be tested; Wherein, during the collection process of the first verification resistance value and the second verification resistance value, the 0 ohm relay and the standard resistance relay are in a power-off state.

7. A relay detection device, characterized in that: The relay detection device is used to perform the relay detection method according to any one of claims 1 to 6, and the relay detection device includes a detection interface, an internal power supply, an ohmmeter and a power supply and power failure control module; The detection interface includes a first interface connected to the coil power supply wiring position corresponding to the relay base and a second interface connected to the contact wiring position corresponding to the relay base; the first interface is electrically connected to the first output end of the internal power supply, and the control component of the power supply and power failure control module is connected in series between the first output end of the internal power supply and the first interface; the second interface is electrically connected to the ohmmeter measurement contact, and the second output end of the internal power supply is electrically connected to the power supply end of the ohmmeter; The detection interface is used to connect to a relay base that matches the relay to be detected; The internal power supply is used to supply power to the relay to be detected and the ohmmeter; The ohmmeter is used to collect the contact resistance measurement value and the contact resistance re-measurement value of the relay to be tested; The power supply and power failure control module is used to determine the detection result of the relay to be detected according to the contact resistance measurement value; When the measured contact resistance value is insufficient to obtain a test result according to the preset judgment condition, the relay to be tested is powered on, powered off and measured again according to the retest power supply times; When all the contact resistance re-measured values ​​are less than or equal to the critical resistance, obtaining the historical average resistance of the relay to be detected, and calculating the total average resistance of the contact resistance measurement value and the contact resistance re-measured value; If the difference between the total average resistance and the historical average resistance is less than the average difference threshold, determining that the detection result is in a normal state; If the difference is greater than the average difference threshold, the detection result is determined to be in a close inspection state.

8. The device according to claim 7, characterized in that The power supply and power-off control module is specifically used to, when the contact resistance measurement value does not meet the preset judgment condition, retest and power off the relay to be detected according to the retest power supply times, and the retest power supply times are greater than the preset power supply time, the preset power off time and the preset power supply times; in the process of powering on and off the relay to be detected, collect the contact resistance retest value of the relay to be detected; The detection result of the relay to be detected is determined according to the contact resistance measurement value and the contact resistance re-measurement value.

9. The device according to claim 7, characterized in that The relay detection device also includes a 0 ohm relay and a standard resistance relay; The 0 ohm relay is a short-circuit relay equipped with a relay base, and the 0 ohm relay is used to zero the relay detection device; The standard resistance relay is a relay equipped with a relay base and having a standard resistor connected in series between contacts. The standard resistance relay is used to calibrate the relay detection device.

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