Contact network electricity testing equipment

Abstract

The utility model discloses a contact network electricity testing device. The contact network electricity testing equipment comprises a capacitive voltage divider which comprises an access end, a leading-out end and a voltage division output end, the access end is used for being connected with a contact network, the leading-out end is used for being connected with a backflow rail, and the voltage division output end can output a voltage division signal; the voltage collector comprises a first interface module, an active voltage collection module and a second interface module, the active voltage collection module is connected with the partial voltage output end through the first interface module, and the active voltage collection module is configured to obtain real-time voltage of the contact network and an electricity testing result based on the partial voltage signal; and the second interface module is connected with the active voltage acquisition module, and is used for supplying power to the active voltage acquisition module through an external power supply and sending out the real-time voltage acquired by the active voltage acquisition module. According to the contact network electricity testing equipment provided by the embodiment of the utility model, the dependence on manual electricity testing work is reduced, and real-time electricity testing of the contact network can be realized.

Description

Technical Field

[0001] The utility model relates to the field of power system voltage detection equipment, in particular to a catenary voltage detection equipment. Background Art

[0002] In recent years, the electrified railway in China has developed rapidly, constructing an electrified railway network. With the continuous increase of electrified railway lines, new requirements have been put forward for the maintenance work of the catenary. The voltage system of the electrified railway is 25 kV AC, which belongs to high voltage. When maintenance personnel carry out the maintenance of the high-speed railway catenary, they need to open the power isolation switch, detect no voltage and perform the grounding operation of the catenary before they can carry out the maintenance.

[0003] At present, the traditional method for detecting the voltage of the high-voltage AC catenary is: after the power isolation switch is opened, the maintenance personnel use high-voltage voltage detection equipment to detect the voltage of the catenary. The whole process relies more on manual operation, with low work efficiency, bringing great potential safety hazards to the life safety of the maintenance personnel, and unable to perform real-time voltage detection. Content of the Utility Model

[0004] The utility model provides a catenary voltage detection equipment, which reduces the dependence on manual voltage detection work and can realize real-time voltage detection of the catenary.

[0005] An embodiment of the utility model provides a catenary voltage detection equipment, which includes: a capacitive voltage divider, including an access end, a lead-out end and a voltage-dividing output end, the access end is used for connecting to the catenary, the lead-out end is used for connecting to the return rail, the voltage-dividing output end can output a voltage-dividing signal, and the voltage-dividing signal is the catenary voltage signal after being divided by the capacitive voltage divider; a voltage collector, including a first interface module, an active voltage collection module and a second interface module, the active voltage collection module is connected to the voltage-dividing output end through the first interface module, the active voltage collection module is configured to obtain the real-time voltage of the catenary and the voltage detection result based on the voltage-dividing signal, the second interface module is connected to the active voltage collection module, and is used for supplying power to the active voltage collection module through an external power supply and sending the real-time voltage obtained by the active voltage collection module outward.

[0006] According to the foregoing embodiment of the utility model, the capacitive voltage divider includes a high-voltage capacitor and a low-voltage capacitor connected in series in sequence from the access end to the lead-out end, and the voltage-dividing output end is connected to the node between the high-voltage capacitor and the low-voltage capacitor.

[0007] According to any of the foregoing embodiments of the present utility model, the active voltage acquisition module includes an active filtering unit, a data processing unit, and a live test result indicator. The active filtering unit is connected between the data processing unit and the first interface module. The data processing unit is further connected to the second interface module and the live test result indicator. The voltage division signal is filtered by the active filtering unit and then collected and processed by the data processing unit to obtain the real-time voltage and the live test result. The data processing unit controls the indication state of the live test result indicator according to the live test result.

[0008] According to any of the foregoing embodiments of the present utility model, the data processing unit is configured to collect the voltage division signal filtered by the active filtering unit and compare it with a preset first startup voltage value, and obtain the live test result according to the comparison result.

[0009] According to any of the foregoing embodiments of the present utility model, the data processing unit is configured to adjust the first startup voltage value according to a startup voltage setting signal received from the second interface module.

[0010] According to any of the foregoing embodiments of the present utility model, the active voltage acquisition module further includes a buck unit. The buck unit is connected to the second interface module, the active filtering unit, the data processing unit, and the live test result indicator. The supply current of the external power supply is stepped down by the buck unit and then supplies power to the active filtering unit, the data processing unit, and the live test result indicator.

[0011] According to any of the foregoing embodiments of the present utility model, the voltage collector further includes a passive live indication module. The passive live indication module is connected to the voltage division output end through the first interface module. The passive live indication module is configured to indicate whether the catenary is live based on the voltage division signal.

[0012] According to any of the foregoing embodiments of the present utility model, the passive live indication module includes a rectifying circuit, an energy storage capacitor, a bidirectional triggering device, and a light-emitting diode. The energy storage capacitor is connected to the first interface module through the rectifying circuit. One pole of the energy storage capacitor is connected to the first pole of the light-emitting diode through the bidirectional triggering device, and the other pole of the energy storage capacitor is connected to the second pole of the light-emitting diode.

[0013] According to any of the foregoing embodiments of the present utility model, the rectifying circuit is a full-wave rectifying circuit, a half-wave rectifying circuit, or a rectifier bridge.

[0014] According to any of the foregoing embodiments of the present utility model, the bidirectional triggering device is a bidirectional trigger diode; or the bidirectional triggering device includes two triodes, the bases of the two triodes are open-circuited and the collectors are connected.

[0015] The catenary voltage detection device according to an embodiment of the present utility model includes a capacitive voltage divider and a voltage collector. The capacitive voltage divider and the voltage collector can be fixedly installed at the site of the voltage detection scenario without disassembly. The capacitive voltage divider is connected to the catenary, and its voltage-dividing output terminal can output the catenary voltage signal after voltage division by the capacitive voltage divider, that is, output a voltage-divided signal. The voltage collector can process the catenary's real-time voltage and the voltage detection result based on this voltage-divided signal. Through the cooperation of the capacitive voltage divider and the voltage collector, the catenary voltage signal can be accurately collected and the voltage detection result of the catenary can be obtained. The catenary voltage detection device arranged at the voltage detection site in the embodiment of the present utility model reduces the dependence on manual on-site operation during voltage detection compared with the traditional handheld capacitive high-voltage voltage detector, has higher efficiency in voltage detection work, and avoids the safety risks brought by maintenance personnel holding the device for on-site voltage detection. In addition, in the catenary voltage detection device in the embodiment of the present utility model, the second interface module can send the real-time voltage obtained by the active voltage acquisition module outward, so as to realize real-time voltage detection of the catenary and make it more convenient to realize remote monitoring of the real-time voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the catenary voltage detection device of the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the capacitive voltage divider in an embodiment of the catenary voltage detection device of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the voltage collector in an embodiment of the catenary voltage detection device of the present utility model;

[0020] Figure 4 It is a schematic structural diagram of the passive live indication module in an embodiment of the catenary voltage detection device of the present utility model;

[0021] Figure 5 It is a schematic structural diagram of the passive live indication module in an alternative embodiment of the catenary voltage detection device of the present utility model.

[0022] Description of the reference numerals:

[0023] 100 - Capacitive voltage divider; 110 - Access terminal; 120 - Lead - out terminal; 130 - Divided - voltage output terminal; C1 - High - voltage capacitor; C2 - Low - voltage capacitor;

[0024] 200 - Voltage collector; 210 - First interface module; 220 - Second interface module; 230 - Active voltage acquisition module; 231 - Active filter unit; 232 - Data processing unit; 233 - Live - line detection result indicator; 234 - Step - down unit; 240 - Passive live - line indication module; U1 - Rectifier circuit; C3 - Energy - storage capacitor; LD1 - Light - emitting diode; D1 - Bidirectional trigger diode; Q1 - First triode; Q2 - Second triode; R1 - First current - limiting resistor; R2 - Second current - limiting resistor; R3 - Third current - limiting resistor;

[0025] V1 - Catenary; V2 - Return rail.

[0026] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0028] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0029] The traditional method for live - line detection of high - voltage AC catenary is as follows: after the power isolation knife switch is opened, the maintenance personnel hold a capacitive high - voltage live - line detector to detect the catenary at the live - line detection site. The whole process relies more on manual operation, with low work efficiency, bringing greater potential safety hazards to the lives and safety of maintenance personnel, and it is impossible to perform real - time live - line detection.

[0030] An embodiment of the present utility model provides a catenary voltage detection device. Figure 1 It is a schematic structural diagram of an embodiment of the catenary voltage detection device of the present utility model. The catenary voltage detection device includes a capacitive voltage divider 100 and a voltage collector 200.

[0031] Figure 2 It is a schematic structural diagram of the capacitive voltage divider in an embodiment of the catenary voltage detection device of the present utility model. The capacitive voltage divider 100 includes an access end 110, a lead-out end 120, and a voltage division output end 130. The access end 110 is used to connect to the catenary V1. The lead-out end 120 is used to connect to the return rail V2. The voltage division output end 130 can output a voltage division signal, and the voltage division signal is the catenary voltage signal after being divided by the capacitive voltage divider 100.

[0032] Figure 3 It is a schematic structural diagram of the voltage collector in an embodiment of the catenary voltage detection device of the present utility model. The voltage collector 200 includes a first interface module 210, an active voltage acquisition module 230, and a second interface module 220. The active voltage acquisition module 230 is connected to the voltage division output end 130 through the first interface module 210. The active voltage acquisition module 230 is configured to obtain the real-time voltage of the catenary and the voltage detection result based on the voltage division signal. The second interface module 220 is connected to the active voltage acquisition module 230 and is used to supply power to the active voltage acquisition module 230 through an external power source and send the real-time voltage acquired by the active voltage acquisition module 230 outward.

[0033] The catenary voltage detection device according to the embodiment of the present utility model includes a capacitive voltage divider 100 and a voltage collector 200. The capacitive voltage divider 100 and the voltage collector 200 can be fixedly installed at the site of the voltage detection scenario without disassembly. The capacitive voltage divider 100 is connected to the catenary V1, and its voltage division output end 130 can output the catenary voltage signal after being divided by the capacitive voltage divider 100, that is, output the voltage division signal. The voltage collector 200 can process the voltage division signal to obtain the real-time voltage of the catenary and the voltage detection result. Through the cooperation of the capacitive voltage divider 100 and the voltage collector 200, the catenary voltage signal can be accurately acquired and the voltage detection result of the catenary V1 can be obtained. The catenary voltage detection device arranged at the voltage detection site in the embodiment of the present utility model reduces the dependence on manual on-site operation during voltage detection compared with the traditional handheld capacitive high-voltage voltage detector, has higher efficiency in voltage detection work, and avoids the safety risks brought by the maintenance personnel holding the device for voltage detection on-site. In addition, in the catenary voltage detection device in the embodiment of the present utility model, the second interface module 220 can send the real-time voltage acquired by the active voltage acquisition module 230 outward, so as to realize real-time voltage detection of the catenary and facilitate remote monitoring of the real-time voltage.

[0034] In the traditional method for verifying the electrification of high-voltage AC catenaries, maintenance personnel hold a capacitive high-voltage electroscope at the verification site to verify the electrification of the catenary. This capacitive high-voltage electroscope determines whether the line or equipment is electrified by detecting the current flowing through the stray capacitance between the capacitive high-voltage electroscope and the ground. However, the capacitance to the ground is a variable and is directly related to the humidity in the air and the ambient temperature. These factors will all affect the normal operation of the capacitive high-voltage electroscope, and in extreme cases, a dead zone phenomenon in verification may occur (the dead zone phenomenon in verification means that the measured high-voltage equipment is indeed electrified, but using a qualified capacitive high-voltage electroscope cannot detect the electrification of the high-voltage equipment).

[0035] For example Figure 2 In some embodiments, the capacitive voltage divider 100 includes a high-voltage capacitor C1 and a low-voltage capacitor C2 connected in series in sequence from the access terminal 110 to the lead-out terminal 120. The voltage division output terminal 130 is connected to the node between the high-voltage capacitor C1 and the low-voltage capacitor C2.

[0036] In the above embodiments, the capacitance values of the high-voltage capacitor C1 and the low-voltage capacitor C2 in the capacitive voltage divider 100 are both fixed, less affected by temperature and humidity, and will not cause the voltage division ratio of the capacitive voltage divider 100 to change due to environmental changes, thereby affecting the verification result, thus avoiding the phenomenon that the traditional capacitive high-voltage electroscope is prone to verification errors due to being easily affected by the external environment during verification.

[0037] For example Figure 3 In some embodiments, the active voltage acquisition module 230 includes an active filter unit 231, a data processing unit 232, and a verification result indicator light 233. The active filter unit 231 is connected between the data processing unit 232 and the first interface module 210. The data processing unit 232 is also connected to the second interface module 220 and the verification result indicator light 233. The voltage division signal is filtered by the active filter unit 231 and then collected and processed by the data processing unit 232 to obtain the real-time voltage and the verification result. The data processing unit 232 controls the indication state of the verification result indicator light 233 according to the verification result.

[0038] In some embodiments, the data processing unit 232 communicates with an external device through the second interface module 220, for example, by using RS485 communication, so as to send the real-time voltage to other devices or a background device.

[0039] In some embodiments, the data processing unit 232 is configured to collect the voltage division signal filtered by the active filter unit 231 and compare it with a preset first start voltage value, and obtain the verification result according to the comparison result. The data processing unit 232 controls the indication state of the verification result indicator light 233 according to the verification result.

[0040] In some embodiments, the data processing unit 232 includes a processor, a memory, a watchdog circuit, and a communication circuit.

[0041] In the traditional method for verifying the power of a high-voltage AC catenary, maintenance personnel hold a capacitive high-voltage voltage detector at the power verification site to verify the power of the catenary. This capacitive high-voltage voltage detector complies with the test standard of "the starting voltage value is not higher than 45% of the nominal voltage and not lower than 10% of the nominal voltage" according to the national electric power industry standard. The nominal voltage of the catenary is 25 kV, and the starting voltage value range of the capacitive high-voltage voltage detector for the catenary is 2.5 - 11.25 kV. Due to the influence of the induced voltage of the catenary (generally there is a residual voltage of 1 - 6 kV during measurement, and up to 7 - 9 kV in severe cases), the traditional capacitive high-voltage voltage detector is prone to give a false alarm of live electricity during the power verification process. The traditional capacitive high-voltage voltage detector cannot measure the magnitude of the catenary voltage or residual voltage.

[0042] In some embodiments, the data processing unit 232 is configured to adjust the first starting voltage value according to the starting voltage setting signal received from the second interface module 220.

[0043] In the above embodiments, the capacitive voltage divider 100 and the voltage collector 200 cooperate to accurately collect the real-time power supply voltage or the magnitude of the residual voltage of the catenary, and the appropriate first starting voltage value can be set according to the magnitude of the collected residual voltage, thereby avoiding the phenomenon of false alarm of live electricity detected due to the residual voltage during the power verification of the traditional capacitive high-voltage voltage detector.

[0044] In some embodiments, the active voltage acquisition module 230 further includes a buck unit 234. The buck unit 234 is connected to the second interface module 220, the active filter unit 231, the data processing unit 232, and the power verification result indicator 233. The supply current of the external power supply is stepped down by the buck unit 234 and then supplies power to the active filter unit 231, the data processing unit 232, and the power verification result indicator 233.

[0045] In the traditional method for verifying the power of a high-voltage AC catenary, maintenance personnel hold a capacitive high-voltage voltage detector at the power verification site to verify the power of the catenary. This capacitive high-voltage voltage detector is powered by a built-in power supply. When the power supply is exhausted, the battery needs to be replaced or charged. However, during the maintenance operation, there is no condition to replace the battery or charge the battery. Therefore, the traditional capacitive high-voltage voltage detector is prone to affect the progress of the maintenance operation due to power exhaustion.

[0046] In some embodiments, the voltage collector 200 further includes a passive live indication module 240. The passive live indication module 240 is connected to the voltage division output terminal 130 through the first interface module 210, and the passive live indication module 240 is configured to indicate whether the catenary is live based on the voltage division signal.

[0047] Figure 4 This is a schematic structural diagram of a passive live indication module in an embodiment of the catenary live verification device of the present utility model. In some embodiments, the passive live indication module 240 includes a rectifying circuit U1, an energy storage capacitor C3, a bidirectional triggering device, and a light-emitting diode LD1. The energy storage capacitor C3 is connected to the first interface module 210 through the rectifying circuit U1. One pole of the energy storage capacitor C3 is connected to the first pole of the light-emitting diode LD1 through the bidirectional triggering device, and the other pole of the energy storage capacitor C3 is connected to the second pole of the light-emitting diode LD1. In this embodiment, the first pole of the light-emitting diode LD1 is the anode, and the second pole of the light-emitting diode LD1 is the cathode.

[0048] The rectifying circuit U1 is a full-wave rectifying circuit, a half-wave rectifying circuit, or a rectifier bridge. In this embodiment, the rectifying circuit U1 being a rectifier bridge is taken as an example for illustration.

[0049] In this embodiment, the bidirectional triggering device is a bidirectional trigger diode D1. In some other embodiments, the bidirectional triggering device can be other types of devices or a combination of devices.

[0050] Figure 5 This is a schematic structural diagram of a passive live indication module in an alternative embodiment of the catenary live verification device of the present utility model. The passive live indication module 240 includes a rectifying circuit U1, an energy storage capacitor C3, a bidirectional triggering device, and a light-emitting diode LD1. In this alternative embodiment, the bidirectional triggering device includes two triodes, and the bases of the two triodes are open and the collectors are connected. In this embodiment, the two triodes are the first triode Q1 and the second triode Q2, and both the first triode Q1 and the second triode Q2 are NPN-type triodes. The bases of the first triode Q1 and the second triode Q2 are open and the collectors are connected. The emitter of the first triode Q1 is connected to one pole of the energy storage capacitor C3, and the emitter of the second triode Q2 is connected to the first pole of the light-emitting diode LD1.

[0051] As Figure 4 or Figure 5, in some embodiments, the passive live indication module 240 further includes a first current-limiting resistor R1, a second current-limiting resistor R2, and a third current-limiting resistor R3. The first current-limiting resistor R1 and the second current-limiting resistor R2 are respectively connected between two input terminals of the rectifier circuit U1 and the first interface module 210. The third current-limiting resistor R3 is connected in series between the bidirectional trigger device and the light-emitting diode LD1. The third current-limiting resistor R3 is used to adjust the conduction current and the light-emitting brightness of the light-emitting diode. The voltage across the two poles of the energy storage capacitor C3 depends on the voltage of the voltage-dividing output terminal 130 of the capacitive voltage divider 100 and the resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2. The minimum catenary voltage value that can light up the light-emitting diode LD1 is the second startup voltage value of the passive live indication module 240, and the magnitude of the second startup voltage value is determined by the voltage division ratio of the capacitive voltage divider 100, the resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2, and the breakdown voltage of the bidirectional trigger device.

[0052] In the above embodiments, the voltage collector 200 of the catenary live verification device has two working modes, namely an active working mode and a passive working mode.

[0053] Specifically, in the active working mode, an external power supply supplies power to the voltage collector 200 through the second interface module 220. The voltage collector 200 collects the voltage-dividing signal through the active voltage acquisition module 230, processes and calculates to obtain the real-time voltage and judges the live verification result, so as to realize the real-time live verification of the catenary. The active voltage acquisition module 230 also sends the real-time voltage to other devices or background equipment through the second interface module 220. The active voltage acquisition module 230 can also support the background equipment to adjust the first startup voltage value.

[0054] In the passive working mode, there is no external power supply to supply power to the voltage collector 200. At this time, the voltage collector 200 takes power from the voltage-dividing output terminal 130 of the capacitive voltage divider 100 through the passive live indication module 240 and conducts live verification. The passive live indication module 240 indicates whether the catenary is live based on the voltage-dividing signal. At this time, the catenary can be indicated in two states of "voltage present" and "voltage absent" in the passive state. Therefore, when the secondary equipment loses power, that is, when there is no external power supply to supply power to the voltage collector 200, the maintenance personnel can also judge whether the catenary is live through the indication state of the light-emitting diode LD1 of the passive live indication module 240, so as to further ensure the safety of on-site maintenance personnel and equipment when the catenary live verification device is in a passive environment.

[0055] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the concept of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A contact network electrical testing device, characterized in that: include: A capacitive voltage divider, comprising an access terminal, an output terminal and a voltage-dividing output terminal, wherein the access terminal is used to connect to a contact network, the output terminal is used to connect to a return rail, and the voltage-dividing output terminal can output a voltage-dividing signal, wherein the voltage-dividing signal is a contact network voltage signal after voltage division by the capacitive voltage divider; A voltage collector comprises a first interface module, an active voltage collection module and a second interface module, wherein the active voltage collection module is connected to the voltage divider output terminal via the first interface module, and the active voltage collection module is configured to obtain the real-time voltage and electrical test result of the contact network based on the voltage divider signal, and the second interface module is connected to the active voltage collection module and is used to supply power to the active voltage collection module via an external power supply and to send the real-time voltage obtained by the active voltage collection module to the outside.

2. The contact network electrical testing equipment according to claim 1, characterized in that: The capacitive voltage divider comprises a high-voltage capacitor and a low-voltage capacitor which are sequentially connected in series from the input end to the output end, and the voltage-dividing output end is connected to a node between the high-voltage capacitor and the low-voltage capacitor.

3. The contact network electrical testing equipment according to claim 1, characterized in that: The active voltage acquisition module includes an active filtering unit, a data processing unit and an electrical test result indicator light. The active filtering unit is connected between the data processing unit and the first interface module. The data processing unit is also connected to the second interface module and the electrical test result indicator light. The voltage division signal is filtered by the active filtering unit and then collected and processed by the data processing unit to obtain the real-time voltage and the electrical test result. The data processing unit controls the indication state of the electrical test result indicator light according to the electrical test result.

4. The contact network electrical testing equipment according to claim 3, characterized in that: The data processing unit is configured to collect the voltage division signal filtered by the active filter unit and compare it with a preset first starting voltage value, and obtain the electrical test result according to the comparison result.

5. The contact network electrical testing equipment according to claim 4, characterized in that: The data processing unit is configured to adjust the first startup voltage value according to a startup voltage setting signal received from the second interface module.

6. The contact network electrical testing equipment according to claim 3, characterized in that: The active voltage acquisition module also includes a step-down unit, which is connected to the second interface module, the active filtering unit, the data processing unit and the power test result indicator light. The power supply current of the external power supply is stepped down by the step-down unit to supply power to the active filtering unit, the data processing unit and the power test result indicator light.

7. The contact network electrical testing equipment according to claim 1, characterized in that: The voltage collector also includes a passive live indication module, which is connected to the voltage division output terminal through the first interface module, and is configured to indicate whether the contact network is live based on the voltage division signal.

8. The contact network electrical testing equipment according to claim 7, characterized in that: The passive powered indication module includes a rectifier circuit, an energy storage capacitor, a bidirectional trigger device and a light emitting diode. The energy storage capacitor is connected to the first interface module through the rectifier circuit, one pole of the energy storage capacitor is connected to the first pole of the light emitting diode through the bidirectional trigger device, and the other pole of the energy storage capacitor is connected to the second pole of the light emitting diode.

9. The contact network electrical testing equipment according to claim 8, characterized in that: The rectifier circuit is a full-wave rectifier circuit, a half-wave rectifier circuit or a rectifier bridge.

10. The contact network electrical testing equipment according to claim 8, characterized in that: The bidirectional trigger device is a bidirectional trigger diode; or The bidirectional trigger device comprises two triodes, the bases of the two triodes are open and the collectors are connected.

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