CN115877191A - Relay service life assessment method and test system for rail transit - Google Patents
Relay service life assessment method and test system for rail transit Download PDFInfo
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- CN115877191A CN115877191A CN202111138822.2A CN202111138822A CN115877191A CN 115877191 A CN115877191 A CN 115877191A CN 202111138822 A CN202111138822 A CN 202111138822A CN 115877191 A CN115877191 A CN 115877191A
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Abstract
The application provides a relay service life evaluation method and a test system for rail transit, wherein the method comprises the following steps: carrying out contact resistance test on all relays to be tested to respectively obtain the initial contact resistance of each relay to be tested; grouping the relays to be tested, and determining an acceleration model, a degradation model and a stress level; testing the grouped relays to be tested based on preset control logic and the stress level and recording test data, testing the contact resistance of the relays to be tested in an off-line state at intervals of a first preset time length to obtain the test contact resistance of the relays to be tested, and stopping the test until the test meets a tail-end condition; and evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level and the test data to obtain the estimated service life of the relay to be tested.
Description
Technical Field
The application relates to the technical field of rail transit, in particular to a relay service life assessment method and a relay service life testing system for rail transit.
Background
The relay is an electrical element which is widely applied, and the mechanical service life of the relay under different use environments is greatly different. In many application scenarios, the requirements on stability and reliability of the actuation times of the relay are high, and the service life or the failure rate of the relay needs to be evaluated in advance.
The rail transit vehicle-mounted relay has high working environment temperature, requires large application load and long service life, does not apply environmental stress of practical application working conditions to the relay in the conventional relay service life evaluation method, and is difficult to systematically, massively and accurately evaluate the theoretical service life of the relay on a rail transit vehicle-mounted electronic device, so that the service life evaluation result is inaccurate. If the estimated service life is longer than the actual service life, serious traffic accidents may be caused by the damage of the relay in the running process of the rail transit vehicle, and if the estimated service life is shorter than the actual service life, the use efficiency of the relay cannot be fully exerted. Therefore, how to evaluate the service life of the relay used by the rail transit vehicle-mounted electronic device more quickly, effectively, scientifically and accurately is important.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and a system for evaluating a lifetime of a relay used in rail transit.
In view of the above, the present application provides a method for estimating a life of a relay for rail transit, including:
carrying out contact resistance test on all relays to be tested to respectively obtain the initial contact resistance of each relay to be tested;
grouping the relays to be tested, and determining an acceleration model, a degradation model and a stress level;
testing the grouped relays to be tested based on preset control logic and the stress level and recording test data, testing the contact resistance of the relays to be tested in an off-line state at intervals of a first preset time length to obtain the test contact resistance of the relays to be tested, and stopping the test until the test meets a tail-end condition;
and evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level and the test data to obtain the estimated service life of the relay to be tested.
Further, the acceleration model is an Arrhenius model represented as
Where ξ denotes the life characteristic under stress, T i The magnitude of the temperature stress is represented, E represents activation energy, K represents boltzmann constant, and a represents constant coefficient.
Further, the degradation model is expressed as
Wherein R is 0 Denotes initial contact resistance, R t Representing the contact resistance at time t, Q a Represents activation energy, J represents magnitude of electric shock contact stress, a represents size of contact surface atoms, R represents general gas constant, T m Denotes the absolute temperature at the contact patch, t denotes the lifetime, γ denotes the absolute temperature at the contact patch, A 0 Indicating time of zeroAverage diameter of conductive spots, D 0 Indicating a frequency factor.
Further, the testing the grouped relays to be tested based on the preset control logic and the stress level and recording test data includes:
adjusting all normally open contacts of the relay to be tested to be in a disconnected state, detecting the normally open contact state of the relay to be tested, and recording fault data if a fault exists in a detection result;
the following operations are sequentially performed for each group of the grouped relays to be tested,
electrifying the set of relays to be tested, keeping the normally open contact of each relay to be tested in the set of relays to be tested in a closed state within the time range from a first preset time point to a second preset time point,
detecting the normally open contact state of each relay to be detected in the group of relays to be detected at a third preset time point, recording fault data if a fault exists in a detection result, wherein the third preset time point is within the time range from the first preset time point to the second preset time point,
adjusting the normally open contact of each relay to be tested in the set of relays to be tested to be in a disconnected state at the second preset time point, and keeping the disconnected state until a fourth preset time point;
and repeating the operation on all the relays to be tested at intervals of a second preset time length.
Further, the truncation condition includes:
and stopping the test in response to determining that the fault data of the relay to be tested exceeds a first preset threshold value, in response to determining that the switching times of the normally open contact state of the relay to be tested exceeds a second preset threshold value and/or in response to determining that the test contact resistance value is smaller than the manual nominal value.
Further, the evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level and the test data to obtain the estimated service life of the relay to be tested includes:
evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the degradation model and the test data to obtain a first estimated service life of the relay to be tested;
evaluating the service life of the relay to be tested based on the acceleration model, the stress level and the test data to obtain a second estimated service life of the relay to be tested;
and taking the smaller of the first estimated service life and the second estimated service life as the estimated service life of the relay to be tested.
Based on the same inventive concept, the application also provides a relay service life evaluation test system for rail transit, and the test system realizes the service life evaluation method, and comprises the following steps:
the environment box is used for providing environmental stress for the relay;
the case is positioned inside the environment case;
the tooling plate is positioned inside the case and fixedly connected with the case;
the test board is positioned in the case, is fixedly connected with the tooling board and is used for fixing the relay;
the controller is positioned outside the environment box and used for controlling the relay to act;
the monitor is positioned outside the environment box and used for monitoring the on-off state of a normally open contact of the relay;
the analog load is positioned outside the environment box and is electrically connected with the relay;
and the power supply is positioned outside the environment box and used for supplying power to the control circuit, the detection circuit and the analog load.
Furthermore, the test board is provided with a plurality of relays, and each test board is provided with a plurality of relays.
Further, the number of the relays on each test board is the same.
Further, the environmental chamber is a temperature test chamber.
From the above, the method and the system for evaluating the service life of the relay for the rail transit provided by the application integrate the devices such as the control device, the monitoring device, the load device and the environmental box into a system for a relay service life test, and evaluate the service life of the relay by adopting the acceleration model and the degradation model to obtain the conservative and relatively reliable estimated service life. The service life evaluation method and the test system can be used for detecting the relays in batches, the control logic design is simple and reasonable, the test efficiency is improved, and the complicated test flow is simplified. Meanwhile, the monitoring, controlling, power supply and load are arranged outside the environment box, so that the failure caused by the interference of the environment box is avoided to a great extent, irrelevant factors influencing the test result are eliminated, and the accuracy of the relay service life test result is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for evaluating the service life of a relay for rail transit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a relay life evaluation test system for rail transit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a relay life evaluation test system for rail transit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The application discloses a relay service life evaluation method for rail transit, which comprises the following steps with reference to fig. 1:
step S101, performing contact resistance test on all relays to be tested to respectively obtain the initial contact resistance of each relay to be tested. Before testing the relay to be tested, testing the initial contact resistance of the relay to be tested so as to compare the initial contact resistance with the degraded contact resistance of the relay to be tested and analyze the failure mode of the relay to be tested.
And S102, grouping the relays to be tested, and determining an acceleration model, a degradation model and a stress level.
Specifically, referring to fig. 2, according to the actual application environment and the test principle of rail transit, a service life assessment test system is built, the relays to be tested are subjected to batch tests, the relays to be tested are electrically connected with the analog load, the specific connection mode is as shown in fig. 2, an alternating current contactor KM is selected as the analog load, and a resistor R1 is selected as a protection resistor of the analog load. The relays to be tested are grouped, in the embodiment, the relays to be tested are divided into 10 groups, and each group comprises 4 relays to be tested. According to the practical application condition of the rail transit vehicle-mounted electronic device, constant high temperature is adopted as the acceleration stress of the service life evaluation of the relay to be tested, and the stress levels are set to be 85 ℃ and 105 ℃.
Step S103, testing the grouped relays to be tested based on preset control logic and the stress level and recording test data, testing the contact resistance of the relays to be tested in an off-line state at intervals of a first preset time length to obtain the test contact resistance of the relays to be tested, and stopping the test until the test meets the tail-cutting condition.
Specifically, before testing the relay to be tested, the test system is debugged, and meanwhile, whether each component works normally is checked, such as whether the relay is normally opened or closed, whether a monitoring circuit effectively monitors fault data, whether a control circuit normally controls the on-off frequency of the relay, and the like. And after the test system is debugged, carrying out the test, and recording test data including a test time point, the action times corresponding to the time point and the like while testing. And testing the contact resistance of the relay to be tested at intervals of a first preset time length, checking the degradation condition of the relay to be tested, and stopping the test when the tail cutting condition occurs.
And S104, evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level and the test data to obtain the estimated service life of the relay to be tested.
In the embodiment, the acceleration model and the degradation model are selected to respectively evaluate the service life of the relay to be tested, the stress level of the acceleration model is temperature, different test temperatures are selected to carry out a service life test on the relay to be tested, and the service life is evaluated. The degradation model selects the contact resistance as a degradation parameter to evaluate the service life of the relay to be tested, the contact resistance is tested in the test process to obtain a test contact resistance, and the test contact resistance is compared with the initial contact resistance obtained before the test is started, so that the degradation process of the relay to be tested can be analyzed.
In some embodiments, the acceleration model is an arrhenius model, represented as
Where ξ denotes the life characteristic under stress, T i The magnitude of the temperature stress is represented, E represents activation energy, K represents boltzmann constant, and a represents constant coefficient.
In some embodiments, the degradation model is represented as
Wherein R is 0 Denotes initial contact resistance, R t Representing the contact resistance at time t, Q a Represents activation energy, J represents magnitude of electric shock contact stress, a represents size of contact surface atoms, R represents general gas constant, T m Denotes the absolute temperature at the contact patch, t denotes the lifetime, γ denotes the absolute temperature at the contact patch, A 0 Denotes the average diameter of the conductive spot at time zero, D 0 Indicating a frequency factor.
In some embodiments, the testing the grouped relays under test based on the preset control logic and the stress level and recording test data includes:
adjusting the normally open contacts of all the relays to be tested to be in a disconnected state, detecting the normally open contact state of all the relays to be tested when the output of all the relays to be tested is 0, and recording fault data if the detection result has a fault, for example, the output is 1;
for each grouped group of the relays to be tested, the following operations are sequentially executed:
the group of relays to be tested is electrified, the normally open contact of each relay to be tested in the group of relays to be tested is kept in a closed state within the time range from a first preset time point to a second preset time point, the output of the group of relays to be tested is 1 at the moment, the output of the relays to be tested in other groups is still 0, and if a fault occurs, fault data are recorded;
detecting the normally open contact state of each relay to be detected in the group of relays to be detected at a third preset time point, wherein the third preset time point is within the time range from the first preset time point to the second preset time point, namely detecting the electric shock on-off state of the group of relays in the process of keeping the normally open contacts closed, and recording fault data if the group of relays has faults;
adjusting the normally open contact of each relay to be tested in the group of relays to be tested to be in a disconnected state at the second preset time point, keeping the disconnected state until a fourth preset time point, restoring the group of relays to be tested to be in an initial disconnected state, detecting the on-off state of the normally open contact, and recording fault data if a fault exists;
and repeating the operations for all the relays to be tested at every interval of a second preset time, and after each group of relays finishes one-time closing and opening, continuing repeating the closing and opening operations for all the relays to be tested until a tail-truncation condition occurs so as to finish the service life evaluation test for all the relays to be tested.
In some embodiments, the truncation condition comprises: and stopping the test in response to determining that the fault data of the relay to be tested exceeds a first preset threshold value, in response to determining that the switching times of the normally open contact state of the relay to be tested exceeds a second preset threshold value and/or in response to determining that the test contact resistance value is smaller than the manual nominal value. Specifically, the truncation conditions include the three conditions described above, and the test can be terminated when any one of the conditions occurs.
In some embodiments, the evaluating the life of the relay under test based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level, and the test data to obtain an estimated life of the relay under test includes:
evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the degradation model and the test data to obtain a first estimated service life of the relay to be tested;
evaluating the service life of the relay to be tested based on the acceleration model, the stress level and the test data to obtain a second estimated service life of the relay to be tested;
and taking the estimated service life of the relay to be tested as the estimated service life of the relay to be tested, wherein the value of the first estimated service life and the second estimated service life is smaller.
In the embodiment, the service life of the relay to be tested is evaluated through two models to obtain a first estimated service life and a second estimated service life, the service life is shorter and is used as the conservative estimated service life of the relay to be tested, the service life of the relay to be tested can be more accurately evaluated through the service life evaluation method, the service efficiency of the relay is fully exerted, and meanwhile, major traffic accidents are avoided.
It should be noted that the foregoing describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Based on the same inventive concept, corresponding to the method of any embodiment, the application also provides a relay service life evaluation test system for rail transit.
Referring to fig. 3, the relay life evaluation test system for rail transit includes:
the environment box is used for providing environmental stress for the relay;
the case is positioned inside the environment case;
the tooling plate is positioned inside the case and fixedly connected with the case;
the test board is positioned in the case, is fixedly connected with the tooling board and is used for fixing the relay;
the controller is positioned outside the environment box and used for controlling the relay to act;
the monitor is positioned outside the environment box and used for monitoring the on-off state of a normally open contact of the relay;
the analog load is positioned outside the environment box and is electrically connected with the relay;
and the power supply is positioned outside the environment box and used for supplying power to the control circuit, the detection circuit and the analog load.
In some embodiments, the test board is provided in plurality, and each test board is provided with a plurality of relays.
In some embodiments, the number of relays on each of the test boards is the same.
In some embodiments, the environmental chamber is a temperature test chamber.
The test system of the above embodiment is used to implement the corresponding method for estimating the service life of the relay for rail transit in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
The following description will be given by way of example of a test method of a relay life evaluation test system for rail transit:
the test system shown in fig. 3 is built based on the test principle shown in fig. 2, 10 groove positions are formed in the tooling plate, 10 test plates are fixed respectively, 4 relays to be tested are fixed on each test plate, and the test system can simultaneously perform service life detection tests on 40 relays to be tested. And 4 analog loads are arranged outside the environment box, and each analog load corresponds to a relay to be tested. When 4 relays to be tested on each test board are simultaneously electrified, the corresponding 4 analog loads are simultaneously matched with the relays to be tested to complete on-off state conversion under the analog application scene. The analog load is selected according to the actual application scene of the rail transit, the analog load in the embodiment is the inductive load of the direct current contactor of 110V and 0.1A, and the analog load can be properly adjusted in other application scenes. And inputting the preset control logic into the control circuit, debugging the test system and then carrying out the test.
According to the requirements of standard IEC 61810-7:
disconnecting the relays to be tested on all the test boards, wherein the output of the first group of relays to be tested is 0;
and when the time is 0ms, the 4 relays of the first group are electrified simultaneously, the normally open contact is changed from the open state to the closed state until the test board of the No. 1 slot position in 900ms outputs 1, and the test boards of other slot positions keep the initial state. The normally open contact state of the first group of 4 relays is detected at 100 ms. At this time, the first preset time point is 0ms, the second preset time point is 900ms, and the third preset time point is 100ms;
and (3) restoring the initial state of the first group of relays to be tested at 900ms, converting the normally open contact from the closed state to the open state until 1000ms, and at the moment, setting the fourth preset time point to be 1000ms.
After the relay disconnection of 1 number trench test panel, no. 2 trench test panel relays move, the normally open contact of No. 2 trench test panel relays moves as the closure state by the off-state, other trench test panel relays do not move, resume initial state after No. 2 trench test panel reachs the fourth preset time point 1000ms, the relay action of No. 3 trench test panel, until the relay action of No. 10 trench test panel, every test panel relay action logic is the same with No. 1 trench test panel. And when the relay of the No. 10 slot position test board reaches the fourth preset time point and returns to the initial state, the relay of the No. 1 slot position test board restarts to act, the second preset time at this moment is 9s, and a new round of operation is started after 9s until a tail-end condition occurs.
After the above test, the obtained test data is analyzed, specifically as follows:
1. failure analysis: if the relay fails in the test process, failure analysis needs to be carried out on the failed relay to determine whether the failure mechanism is the service life degradation failure, namely whether oxidation and ablation products exist on the surface of the contact is observed, and if the oxidation and ablation products exist, the failure mechanism of the relay is proved to be the service life degradation failure. And synchronously recording the failure time point, the failure mode, the contact resistance in failure and the like of the failure sample of the test.
2. And (3) analyzing degradation trend: samples from the test development to the action times of 1 ten thousand, 5 ten thousand, 10 ten thousand and 20 ten thousand are extracted for Destructive Physical Analysis (DPA), and the relation between the change of the contact morphology and the trend of the contact resistance degradation is observed.
3. And (3) fitting a service life distribution function: and fitting a service life distribution function of the sample by using a data analysis tool according to the failure time of the relay to be tested, wherein the common service life distribution function comprises an exponential function, a normal function, a Weibull function and the like, and the selection of the specific service life distribution function is based on the goodness of fit.
4. And (3) life evaluation: and obtaining the reliable service life corresponding to the relay to be tested according to the service life distribution function, and evaluating the service life of the relay by combining the acceleration model and the degradation model. The first estimated service life of the relay to be measured is obtained through calculation of an Allen model, the Allen model in the formula (1) is a common model for service life estimation, and the calculation process is not repeated. Calculating to obtain a second estimated service life of the relay to be measured through a degradation model, and obtaining the second estimated service life based on the initial contact resistance R according to the formulas (2) and (3) 0 Test contact resistance R t And stress level T m The operating time of the relay to be tested at this stress level, i.e., the second estimated lifetime, can be obtained. And comparing the first estimated service life with the second estimated service life, and taking the smaller value as the final estimated service life of the relay to be tested on the basis of conservative prediction.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.
Claims (10)
1. A relay life evaluation method for rail transit is characterized by comprising the following steps:
performing contact resistance test on all relays to be tested to respectively obtain the initial contact resistance of each relay to be tested;
grouping the relays to be tested, and determining an acceleration model, a degradation model and a stress level;
testing the grouped relays to be tested based on preset control logic and the stress level and recording test data, testing the contact resistance of the relays to be tested in an off-line state at intervals of a first preset time length to obtain the test contact resistance of the relays to be tested, and stopping the test until the test meets the truncation condition;
and evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level and the test data to obtain the estimated service life of the relay to be tested.
2. The life evaluation method according to claim 1, wherein the acceleration model is an arrhenius model expressed as
Where ξ denotes the life characteristic under stress, T i Indicating temperature stressThe size, E, K, and a represent the activation energy, boltzmann constant, and constant coefficient, respectively.
3. The life evaluation method according to claim 1, wherein the degradation model is represented as
Wherein R is 0 Denotes initial contact resistance, R t Representing the contact resistance at time t, Q a Represents activation energy, J represents contact stress of the contact, a represents atomic size of the contact surface, R represents general gas constant, T m Denotes the absolute temperature at the contact spot, t denotes the lifetime, γ denotes the parabolic growth constant of the corrosion film on the contact surface, A 0 Denotes the average diameter of the conductive spot at time zero, D 0 Indicating a frequency factor.
4. The method of claim 1, wherein the testing the grouped relays under test based on the preset control logic and the stress level and recording test data comprises:
adjusting all normally open contacts of the relay to be tested to be in a disconnected state, detecting the normally open contact state of the relay to be tested, and recording fault data if a fault exists in a detection result;
the following operations are sequentially performed for each group of the grouped relays to be tested,
electrifying the set of relays to be tested, keeping the normally open contact of each relay to be tested in the set of relays to be tested in a closed state within the time range from a first preset time point to a second preset time point,
detecting the normally open contact state of each relay to be detected in the group of relays to be detected at a third preset time point, recording fault data if a fault exists in a detection result, wherein the third preset time point is within the time range from the first preset time point to the second preset time point,
adjusting the normally open contact of each relay to be tested in the group of relays to be tested to be in a disconnected state at the second preset time point, and keeping the disconnected state until a fourth preset time point;
and repeating the operation on all the relays to be tested at intervals of a second preset time length.
5. The life evaluation method of claim 1, wherein the truncation condition comprises:
and stopping the test in response to determining that the fault data of the relay to be tested exceeds a first preset threshold value, in response to determining that the switching times of the normally open contact state of the relay to be tested exceeds a second preset threshold value and/or in response to determining that the test contact resistance value is smaller than the manual nominal value.
6. The method of claim 1, wherein the estimating the life of the relay under test based on the initial contact resistance, the test contact resistance, the acceleration model, the degradation model, the stress level, and the test data to obtain the estimated life of the relay under test comprises:
evaluating the service life of the relay to be tested based on the initial contact resistance, the test contact resistance, the degradation model and the test data to obtain a first estimated service life of the relay to be tested;
evaluating the service life of the relay to be tested based on the acceleration model, the stress level and the test data to obtain a second estimated service life of the relay to be tested;
and taking the estimated service life of the relay to be tested as the estimated service life of the relay to be tested, wherein the value of the first estimated service life and the second estimated service life is smaller.
7. A relay life evaluation test system for rail transit, which implements the life evaluation method according to any one of claims 1 to 6, characterized by comprising:
the environment box is used for providing environmental stress for the relay;
the case is positioned inside the environment case;
the tooling plate is positioned inside the case and fixedly connected with the case;
the test board is positioned in the case, is fixedly connected with the tooling board and is used for fixing the relay;
the controller is positioned outside the environment box and used for controlling the relay to act;
the monitor is positioned outside the environment box and used for monitoring the on-off state of a normally open contact of the relay;
the analog load is positioned outside the environment box and is electrically connected with the relay;
and the power supply is positioned outside the environment box and used for supplying power to the control circuit, the detection circuit and the analog load.
8. The testing system of claim 7, wherein said test board is provided in plurality, each of said test board having a plurality of said relays provided thereon.
9. The testing system of claim 8, wherein the number of relays on each of the test boards is the same.
10. The testing system of claim 7, wherein the environmental chamber is a temperature test chamber.
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