Method for testing electrical characteristic temperature rise conversion of relay

Abstract

The invention relates to the technical field of relay characteristic test, in particular to a relay electrical characteristic temperature rise conversion test method, which comprises the following steps: S1, building a test environment; s2, recording a test environment temperature t1; s3, testing the coil resistance Rt1 of the relay, converting the coil resistance Rt1 to obtain a 20 DEG C coil resistance R20, and recording the 20 DEG C coil resistance R20; s4, obtaining the function relation of the coil resistance Rt of the relay at the coil temperature t through the coil resistance R20 at the temperature of 20 DEG C; s5, the coil resistance Rt2 of the relay at the moment is tested, and the coil temperature t2 at the moment is obtained through the function relation between the coil resistance Rt and the coil temperature t; s6, the working value and the release value of the relay at the coil temperature t2 are tested, and the working value and the release value of the relay at the temperature of 20 DEG C are obtained. According to the method, more accurate testing can be realized under the condition that the existing hardware environment is not changed, and the method has the advantages of simplicity in implementation, high controllability, low cost and the like.

Description

Technical Field

[0001] The invention relates to the technical field of relay characteristic testing, and in particular to a method for testing temperature rise conversion of relay electrical characteristics. Background Art

[0002] Railway signal relay refers to the electromagnetic switch device in railway signal equipment or system. The electrical characteristics of railway signal relay are the key parameters for evaluating the working state of the relay, and these parameters directly affect the use effect and performance of the relay. The electrical characteristics of the relay usually mainly include the working value and the release value. Whether the working value and the release value meet the specified performance requirements is related to whether the signal equipment and system can operate safely and reliably. Therefore, the relay needs to be tested both at the factory and at each application site. The working value and the release value are generally tested manually or automatically through an adjustable power supply and auxiliary tooling. Since the working value and the release value of the relay are related to the temperature of the coil, it is required that when the ambient temperature is 20°C, the value of the electrical characteristics of the relay should meet the range specified by the standard. At other ambient temperatures, it is converted according to the formula to obtain the value corresponding to 20°C and then compared with the specified range.

[0003] In order to ensure the accuracy of the electrical characteristics test, general test equipment or tooling are equipped with thermometers to test the actual temperature of the environment. Under normal circumstances, the temperature of the coil of the relay remains consistent with the ambient temperature after being placed for a period of time. Therefore, if only one test is performed, it is only necessary to record the ambient temperature and the measured value and convert them according to the formula to obtain the electrical specific value when the ambient temperature is 20°C. However, in reality, there is often a need for multiple tests. After multiple tests, it is found that the test values ​​are getting larger and larger, resulting in unqualified electrical characteristics of the relay. After analysis, this situation is due to a certain difference between the actual temperature of the coil and the ambient temperature. After the coil is energized, there will be a certain temperature rise, and the temperature is a local change. The ambient temperature will not be greatly affected, but the electrical characteristics of the relay will be more sensitive, which will eventually cause inaccurate test results, errors, and misjudgments. Relays with qualified electrical characteristics will be judged as unqualified, bringing unnecessary influences and troubles. Therefore, it is urgent to design a test method that can avoid the interference of coil power-on temperature rise and more accurately test the electrical characteristics of the relay itself. Summary of the invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a test method for temperature rise conversion of relay electrical characteristics. The accurate temperature after the coil temperature changes can be obtained through a functional relationship, thereby avoiding the error caused by directly testing the ambient temperature, ensuring the accuracy of the test value, and obtaining true and reliable test data.

[0005] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0006] A method for testing temperature rise conversion of relay electrical characteristics comprises the following steps:

[0007] S1. Build the test environment, connect the test equipment, and fix the relay;

[0008] S2, power on the test environment equipment to prepare for the test, and record the test environment temperature t1;

[0009] S3, test the coil resistance R of the relay t1 , the coil resistance R t1 Convert to 20℃ coil resistance R 20 and record;

[0010] S4, through 20℃ coil resistance R 20 Get the relay coil resistance R t As a function of coil temperature t;

[0011] S5. Test the coil resistance R of the relay at this time t2 And through the coil resistance R t The functional relationship with the coil temperature t gives the coil temperature t2 at this time;

[0012] S6: Test the working value and release value of the relay at the coil temperature t2 and record them. Obtain the working value and release value of the relay at 20°C through the electrical characteristic conversion formula and the coil temperature t2 to complete the test.

[0013] Furthermore, the test equipment in step S1 includes a micro-ohmmeter, a programmable power supply, a thermometer, a relay test socket and a test connection line.

[0014] Furthermore, the test environment equipment in step S2 includes a micro-ohmmeter and a programmable power supply, and the test environment temperature t1 is obtained by reading a thermometer placed next to the relay.

[0015] Furthermore, the conversion in step S3 uses the coil resistance conversion formula:

[0016]

[0017] Among them, R 20 The coil resistance at 20°C, R t is the coil resistance when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

[0018] Furthermore, the functional relationship obtained in step S4 is:

[0019]

[0020] Further, the relay state in step S5 is the electrical characteristics of the relay tested for the first time or tested multiple times.

[0021] Furthermore, the electrical characteristic conversion formula in step S6 is:

[0022]

[0023] Among them, U 20 is the coil voltage at 20℃, U t is the voltage value when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

[0024] The beneficial effects of the present invention are:

[0025] A test method for temperature rise conversion of electrical characteristics of a relay of the present invention is based on the identification and collection of the change differences between the relay coil temperature and the ambient temperature at different times, and obtains the accurate temperature after the coil temperature changes through a functional relationship, thereby avoiding the error caused by directly testing the ambient temperature, ensuring the accuracy of the test value, and obtaining real and reliable test data. The electrical characteristic parameters of the relay are tested and converted more accurately. The test method of the present invention can achieve more accurate testing without changing the existing hardware environment conditions, and has the advantages of simple implementation, strong controllability and low cost, and this test method can be used to achieve automated testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart of a test method for temperature rise conversion of electrical characteristics of a relay according to the present invention;

[0027] Figure 2 It is a test comparison chart of the conventional test method and the test method of the present invention. DETAILED DESCRIPTION

[0028] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, a test method for temperature rise conversion of relay electrical characteristics includes the following steps:

[0030] S1. Build the test environment, connect the test equipment, and fix the relay;

[0031] S2, power on the test environment equipment to prepare for the test, and record the test environment temperature t1;

[0032] S3, test the coil resistance R of the relay t1 , the coil resistance R t1 Convert to 20℃ coil resistance R20 and record;

[0033] S4, through 20℃ coil resistance R 20 Get the relay coil resistance R t As a function of coil temperature t;

[0034] S5. Test the coil resistance R of the relay at this time t2 And through the coil resistance R t The functional relationship with the coil temperature t gives the coil temperature t2 at this time;

[0035] S6: Test the working value and release value of the relay at the coil temperature t2 and record them. Obtain the working value and release value of the relay at 20°C through the electrical characteristic conversion formula and the coil temperature t2 to complete the test.

[0036] Specifically, the test equipment in step S1 includes a micro-ohmmeter, a programmable power supply, a thermometer, a relay test socket and a test connection line.

[0037] Specifically, the test environment equipment in step S2 includes a micro-ohmmeter and a programmable power supply, and the test environment temperature t1 is obtained by reading a thermometer placed next to the relay.

[0038] Specifically, the conversion in step S3 adopts the coil resistance conversion formula:

[0039]

[0040] Among them, R 20 The coil resistance at 20°C, R t is the coil resistance when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

[0041] More specifically, in step S3, the test wires of the micro-ohmmeter are connected to both ends of the coil of the relay to test the coil resistance R of the electrical appliance. t1 , the coil resistance R t1 Convert and record the 20℃ coil resistance R2, and disconnect the test line after the test;

[0042] Specifically, the functional relationship obtained in step S4 is:

[0043]

[0044] Specifically, the relay state in step S5 is the relay of the electrical characteristics of the initial test or multiple tests. The relay in this step can be in any state, regardless of whether the temperature change of the coil is caused by whether it has been worked. Before the test in step S6, the coil resistance R of the relay at this time is tested in step S5.t2 And through the coil resistance R t The coil temperature t2 is obtained from the functional relationship with the coil temperature t, and then the positive and negative terminals of the output line of the DC programmable power supply are connected to the positive and negative electrodes of the relay coil respectively;

[0045] Specifically, the electrical characteristic conversion formula in step S6 is:

[0046]

[0047] Among them, U 20 is the coil voltage at 20℃, U t is the voltage value when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

[0048] Since both the working value and the release value are voltage values, a standard test process has been established, and the present invention mainly describes the conversion method used to improve the test accuracy after the actual test value is obtained, so the test process of the working value and the release value will not be described in detail.

[0049] like Figure 2 As shown, the actual test results of the working value are analyzed by example. By performing a temperature rise conversion test on the working value after the relay randomly operates a certain number of times and comparing it with the test value that only records the ambient temperature, it can be obviously seen that the working value of the relay tested by the temperature rise conversion test method provided by the present invention is more horizontal, that is, the test result is stable, which reflects the real characteristic status of the relay and greatly reduces the erroneous judgment of poor relay characteristic parameters caused by test errors.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limiting the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test method for temperature rise conversion of relay electrical characteristics, characterized in that: The following steps are involved: S1. Build the test environment, connect the test equipment, and fix the relay; S2, power on the test environment equipment to prepare for the test, and record the test environment temperature t1; S3, test the coil resistance R of the relay t1 , the coil resistance R t1 Convert to 20℃ coil resistance R 20 and record; S4, through 20℃ coil resistance R 20 Get the relay coil resistance R t As a function of coil temperature t; S5. Test the coil resistance R of the relay at this time t2 And through the coil resistance R t The functional relationship with the coil temperature t gives the coil temperature t2 at this time; S6: Test the working value and release value of the relay at the coil temperature t2 and record them. Obtain the working value and release value of the relay at 20°C through the electrical characteristic conversion formula and the coil temperature t2 to complete the test.

2. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 1, characterized in that: The test equipment in step S1 includes a micro-ohmmeter, a programmable power supply, a thermometer, a relay test socket and a test connection line.

3. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 1, characterized in that: The test environment equipment in step S2 includes a micro-ohmmeter and a programmable power supply, and the test environment temperature t1 is obtained by reading a thermometer placed next to the relay.

4. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 1, characterized in that: The conversion in step S3 uses the coil resistance conversion formula: Among them, R 20 The coil resistance at 20°C, R t is the coil resistance when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

5. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 4, characterized in that: The functional relationship obtained in step S4 is:

6. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 1, characterized in that: The relay state in step S5 is the electrical characteristics of the relay in the initial test or multiple tests.

7. A method for testing temperature rise conversion of relay electrical characteristics as claimed in claim 1, characterized in that: The electrical characteristic conversion formula in step S6 is: Among them, U 20 is the coil voltage at 20℃, U t is the voltage value when the coil temperature is t, α is the resistance temperature coefficient of the conductor material being measured, and the copper is 0.0041 / ℃.

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