Bypass switch characteristic testing device

Abstract

The utility model discloses a bypass switch characteristic testing device, particularly relates to the technical field of switch testing, and is technically characterized in that the device comprises an energy storage module, a trigger module, a testing module, a processing module and a control module; the energy storage module comprises an energy storage parallel circuit formed by connecting a plurality of energy storage units in parallel, first ports of branches of the energy storage parallel circuit are connected with one ends of a plurality of switch coils of the bypass switch respectively, and the other ends of the switch coils of the bypass switch are connected with the input end of the trigger module. The output end of the trigger module is connected with the second port of each branch of the energy storage parallel circuit; the energy storage unit comprises a selection switch and a plurality of energy storage capacitors, a movable contact of the selection switch is connected with a first port on a corresponding branch of the energy storage parallel circuit, a plurality of static contacts of the selection switch are respectively connected with one end of each energy storage capacitor, and the other end of each energy storage capacitor is connected with a second port on the corresponding branch of the energy storage parallel circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of switch testing, in particular to a bypass switch characteristic testing device. Background Art

[0002] Fast vacuum bypass switch (hereinafter referred to as bypass switch) is usually used in high-voltage power electronic devices such as flexible DC converter valves and SVG. When a power electronic module connected in parallel fails, it is quickly closed to bypass it, preventing the entire power electronic device from shutting down due to a single module failure. Therefore, whether the bypass switch can operate stably and reliably is directly related to the reliability of the above power electronic devices and the operational stability of the system.

[0003] The characteristic test of the bypass switch is a necessary means to ensure its performance. The current bypass switch test device needs to replace the energy storage capacitor or energy storage power supply to perform characteristic tests on the bypass switch under different working conditions, and the test efficiency is very low. At the same time, the triggering method of the existing bypass switch characteristic device is single. When testing the bypass switch with a multi-coil structure, it is necessary to frequently manually change the trigger wiring method, and the trigger interval time of multiple coils cannot be set.

[0004] Therefore, the utility model aims to provide a bypass switch characteristic testing device to solve the above-mentioned related problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the current bypass switch testing device needs to replace the energy storage capacitor or the energy storage power supply in order to perform characteristic tests on the bypass switch under different working conditions, and the test efficiency is very low; at the same time, the triggering mode of the existing bypass switch characteristic device is single, and when testing the bypass switch with a multi-coil structure, it is necessary to frequently manually change the trigger wiring mode, and the trigger interval time of multiple coils cannot be set. The purpose is to provide a bypass switch characteristic testing device, which is connected to the two coils of the bypass switch through the two energy storage unit branches of the energy storage parallel circuit, so as to form two sets of capacitor energy storage systems that can discharge one of the two coils separately, and at the same time, through the selection switch in the energy storage unit, the energy storage capacitors with different capacities in the energy storage unit can be selected to be connected in series with the branch, so as to achieve the purpose of selecting the energy storage capacitor according to the capacity required for the characteristic test, thereby improving the test efficiency.

[0006] The utility model is realized by the following technical solutions:

[0007] A bypass switch characteristic testing device, the device comprising an energy storage module, a trigger module, a testing module, a processing module and a control module;

[0008] The energy storage module includes an energy storage parallel circuit formed by a plurality of energy storage units connected in parallel, the first port of each branch of the energy storage parallel circuit is respectively connected to one end of a plurality of switch coils of the bypass switch, the other end of the plurality of switch coils of the bypass switch is connected to the input end of the trigger module, and the output end of the trigger module is connected to the second port of each branch of the energy storage parallel circuit;

[0009] The energy storage unit includes a selection switch and multiple energy storage capacitors. The moving contact of the selection switch is connected to the first port on the corresponding branch of the energy storage parallel circuit, the multiple static contacts of the selection switch are respectively connected to one end of the multiple energy storage capacitors, and the other ends of the multiple energy storage capacitors are all connected to the second port on the corresponding branch of the energy storage parallel circuit.

[0010] Furthermore, the energy storage module also includes a digital potentiometer and a charging power supply, one end of the charging power supply is connected to one end of the energy storage parallel circuit, the other end of the charging power supply is connected to the other end of the energy storage parallel circuit, the input end of the digital potentiometer is connected to the first output end of the processing unit, and the output end of the digital potentiometer is connected to the charging power supply.

[0011] Furthermore, each branch of the energy storage parallel circuit is provided with a first diode, and the first diode is provided at one end close to the first port of each branch.

[0012] Furthermore, the trigger module includes multiple drive circuits and multiple thyristors, the output end of the switch coil of the bypass switch is respectively connected to the input end of the multiple thyristors, the output ends of the multiple thyristors are all connected to one end of the energy storage parallel circuit close to the second port, the multiple drive circuits are respectively connected to the multiple thyristors, and the drive circuits correspond to the thyristors one by one.

[0013] Furthermore, a control switch is provided between the charging power source and the energy storage parallel circuit.

[0014] Furthermore, the number of branches of the energy storage parallel circuit is consistent with the number of switch coils of the bypass switch.

[0015] Furthermore, the number of thyristors and the number of switch coils of the bypass switch are kept consistent.

[0016] Furthermore, each capacitor in the energy storage unit uses capacitors with different capacitance.

[0017] Furthermore, the number of static contacts of the selection switch is consistent with the number of energy storage capacitors.

[0018] Furthermore, the second output end of the processing module is connected to the trigger module, the third output end of the processing module is connected to the test module, the output end of the control module is connected to the input end of the processing module, one end of the energy storage module is connected to one end of the switch coil of the bypass switch, the other end of the switch coil of the bypass switch is connected to the input end of the trigger module, the output end of the trigger module is connected to the other end of the energy storage module, and the test module is connected to the bypass switch.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] 1. In the utility model, two energy storage unit branches of the energy storage parallel circuit are respectively connected to the two coils of the bypass switch, thereby forming two sets of capacitor energy storage systems that can discharge one of the two coils separately. At the same time, through the selection switch in the energy storage unit, energy storage capacitors with different capacities in the energy storage unit can be selected to be connected in series with the branches, so as to achieve the purpose of selecting the energy storage capacitor according to the capacity required for the characteristic test, thereby improving the test efficiency and solving the related problems that the current bypass switch test device needs to replace the energy storage capacitor or the energy storage power supply to perform characteristic tests on the bypass switch under different working conditions, and the test efficiency is very low.

[0021] 2. In the utility model, through the multiple thyristors arranged in the trigger module, the single-coil triggering or multi-coil triggering mode can be quickly selected, and the interval time of the trigger signal between the coils when the multi-coil is triggered can be set, thereby improving the flexibility and test efficiency of the multi-coil bypass switch test, and solving the related problems that the triggering mode of the existing bypass switch characteristic device is single, when testing the bypass switch with a multi-coil structure, it is necessary to frequently manually change the trigger wiring mode, and the triggering interval time of multiple coils cannot be set. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a circuit connection diagram of a bypass switch characteristic testing device in this embodiment;

[0024] Figure 2 Schematic diagram of a partial circuit of an energy storage module in a bypass switch characteristic testing device in this embodiment;

[0025] Figure 3Schematic diagram of a circuit for connecting a test module and a main contact of a bypass switch in a bypass switch characteristic test device in this embodiment;

[0026] Figure 4 Schematic diagram of a circuit for connecting a test module and an auxiliary contact of a bypass switch in a bypass switch characteristic test device in this embodiment;

[0027] Figure 5 A schematic diagram of a closing time curve of a bypass switch characteristic test device in this embodiment for performing a switch characteristic test;

[0028] Figure 6 A schematic diagram of a bounce time curve of a bypass switch characteristic test device in this embodiment for performing a switch characteristic test;

[0029] Figure 7 A schematic diagram of an auxiliary contact return time curve for a bypass switch characteristic test device in this embodiment for a switch characteristic test;

[0030] Figure 8 Schematic diagram of a circuit of a driving circuit in a bypass switch characteristic testing device in this embodiment.

[0031] Marks and corresponding parts names in the attached drawings:

[0032] 1. Energy storage module; 2. Trigger module; 3. Test module; 4. Processing module; 5. Control module; 6. Selection switch; 7. Energy storage capacitor; 8. Digital potentiometer; 9. Charging power supply; 10. First diode; 11. Drive circuit; 12. Thyristor; 13. Control switch; 14. Energy storage parallel circuit; 15. Energy storage unit. DETAILED DESCRIPTION

[0033] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0034] In the present disclosure, unless otherwise specified, the use of the terms "first", "second", etc. to describe various elements is not intended to limit the positional relationship, timing relationship, or importance relationship of these elements, and such terms are only used to distinguish one element from another element. In some examples, the first element and the second element may refer to the same instance of the element, and in some cases, based on the description of the context, they may also refer to different instances.

[0035] The terms used in the description of various examples in this disclosure are only for the purpose of describing specific examples and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element can be one or more. In addition, the term "and / or" used in this disclosure covers any one of the listed items and all possible combinations.

[0036] Example

[0037] For example, see Figure 1 As shown, in this embodiment, the bypass switch tested is a double-coil bypass switch, which has two switch coils. Therefore, the energy storage parallel circuit 14 in this embodiment of the double-coil bypass switch is provided with two energy storage units 15, that is, the energy storage parallel circuit 14 has two branches, and the trigger module 2 is provided with two thyristors 12 and two drive circuits 11; at the same time, in this embodiment, each energy storage unit 15 is provided with two energy storage capacitors 7, and the selection switch 6 is provided with two static contacts and one moving contact. In other embodiments, the static contacts can also be three, four or other numbers; it should be noted that, since an instantaneous current of tens of amperes needs to be passed into the switch coil when the bypass switch is closed, it is necessary to store energy through the energy storage capacitor 7 before a sufficiently large current can be provided instantly.

[0038] A bypass switch characteristic test device, the device includes an energy storage module 1, a trigger module 2, a test module 3, a processing module 4 and a control module 5. In this embodiment, the processing module 4 adopts a microprocessor of model ATMEGA128;

[0039] The energy storage module 1 includes an energy storage parallel circuit 14 formed by two energy storage units 15 connected in parallel with each other. The number of branches of the energy storage parallel circuit 14 is consistent with the number of switch coils of the bypass switch. The first ports of the two branches of the energy storage parallel circuit 14 are respectively connected to one end of the two switch coils of the bypass switch, and the other ends of the two switch coils of the bypass switch are connected to the input end of the trigger module 2. The output end of the trigger module 2 is connected to the second ports of the two branches of the energy storage parallel circuit 14.

[0040] The energy storage unit 15 includes a selection switch 6 and two energy storage capacitors 7. The moving contact of the selection switch 6 is connected to the first port on the corresponding branch of the energy storage parallel circuit 14. The two static contacts of the selection switch 6 are respectively connected to one end of the two energy storage capacitors 7. The other ends of the two energy storage capacitors 7 are both connected to the second port on the corresponding branch of the energy storage parallel circuit 14.

[0041] It should be noted that see Figure 2 As shown, the A end of each branch of the energy storage parallel circuit 14 is the first port, and the B end is the second port;

[0042] At the same time, it should be noted that the two energy storage capacitors 7 are capacitors with different capacitances, and the specific capacitances are determined according to actual needs, see Figure 1 or Figure 2 As shown, C1 and C2 in the figure can be set to capacitors of different sizes; C3 and C4 can be set to capacitors of different sizes.

[0043] Specifically, in the present embodiment, two energy storage units 15 branches of the energy storage parallel circuit 14 are respectively connected to the two coils of the bypass switch, thereby forming two independent capacitor energy storage systems capable of discharging the two coils separately, and at the same time, through the selection switch 6 in the energy storage unit 15, energy storage capacitors 7 with different capacities in the energy storage unit 15 can be selected to be connected in series with the branches, thereby achieving the purpose of selecting the energy storage capacitor 7 according to the capacity required for the characteristic test; at the same time, during the charging process, the selection switch 6 can also achieve the selection of the energy storage capacitor 7.

[0044] Furthermore, the energy storage module 1 also includes a digital potentiometer 8 and a charging power supply 9. In the present embodiment, the digital potentiometer 8 adopts an external digital adjustable resistor, one end of the charging power supply 9 is connected to one end of the energy storage parallel circuit 14, the other end of the charging power supply 9 is connected to the other end of the energy storage parallel circuit 14, the input end of the digital potentiometer 8 is connected to the first output end of the processing unit, and the output end of the digital potentiometer 8 is connected to the charging power supply 9.

[0045] Specifically, in this embodiment, each energy storage capacitor 7 in the energy storage parallel circuit 14 is charged by the charging power supply 9, and the charging voltage is customized by the digital potentiometer 8.

[0046] Furthermore, a first diode 10 is disposed on both branches of the energy storage parallel circuit 14 , and the first diode 10 is disposed at one end close to the first port of each branch.

[0047] Specifically, in this embodiment, two branches can be isolated by the first diode 10 on each branch, so that the two branches can be discharged separately without affecting the voltage of the other branch.

[0048] Furthermore, the trigger module 2 includes two drive circuits 11 and two thyristors 12, the number of the thyristors 12 is consistent with the number of switch coils of the bypass switch, the output ends of the switch coils of the two bypass switches are respectively connected to the input ends of the two thyristors 12, the output ends of the multiple thyristors 12 are all connected to one end of the energy storage parallel circuit 14 close to the second port, the two drive circuits 11 are respectively connected to the two thyristors 12, and the drive circuits 11 and the thyristors 12 correspond one to one.

[0049] Specifically, in this embodiment, the discharge of the two switch coils is achieved through two thyristors 12, and the bypass switch is controlled to achieve the closing operation; at the same time, the two thyristors 12 can achieve the simultaneous discharge of the two switch coils, or the discharge of one switch coil alone; the two thyristors 12 are driven and controlled by two driving circuits 11.

[0050] At the same time, in this embodiment, the closing trigger process is that the control module 5 sends a trigger pulse signal -> the pulse signal is amplified -> the closing thyristor 12 is triggered to turn on -> the energy storage capacitor 7 discharges to the closing coil -> the energy storage capacitor 7 is discharged -> the closing thyristor 12 is turned off, and the processing module 4 can be set to trigger a single coil or two coils according to actual needs.

[0051] Furthermore, a control switch 13 is provided between the charging power source 9 and the energy storage parallel circuit 14 .

[0052] Specifically, in this embodiment, the control switch 13 is provided to facilitate the control of the connection switch between the charging power source 9 and the energy storage parallel circuit 14 .

[0053] Furthermore, the second output end of the processing module 4 is connected to the trigger module 2, the third output end of the processing module 4 is connected to the test module 3, the output end of the control module 5 is connected to the input end of the processing module 4, one end of the energy storage module 1 is connected to one end of the switch coil of the bypass switch, the other end of the switch coil of the bypass switch is connected to the input end of the trigger module 2, the output end of the trigger module 2 is connected to the other end of the energy storage module 1, and the test module 3 is connected to the bypass switch.

[0054] It should be noted that, in the present embodiment, the control module 5 adopts a touch display tablet with a control system, and in other embodiments, other devices capable of inputting and outputting control commands may also be adopted.

[0055] Specifically, in this embodiment, the processing module 4 is used to receive instructions issued by the control module 5, control the trigger module 2 to realize the closing operation of the bypass switch, control the charging and discharging of the energy storage capacitor 7, control the selection switch 6 to realize the switching of energy storage capacitors 7 of different capacities, control the test module 3 to apply test excitation and receive and record the test signal quantity, calculate the switch characteristic parameters such as the closing time of the bypass switch and the auxiliary contact return time according to the test signal quantity, and maintain the set test parameters; the test module 3 is used to output a DC 24V test excitation, and convert the test signal returned by the bypass switch into a digital logic level signal and input it into the processing module 4.

[0056] At the same time, in this embodiment, see Figure 3-4As shown, the test module 3 outputs a DC 24V voltage to the outside, which is connected to the main contact of the bypass switch and one port of the two auxiliary contacts. At the same time, the other port of the above contact is connected to the switch signal input port of the tester. The signal is sent to the processing module 4 after filtering and isolation to calculate the performance parameters such as the closing time, bounce time and return time of the auxiliary contact of the bypass switch.

[0057] Workflow: First, connect the test module 3 to the bypass switch to be tested, then select the charging voltage of the energy storage capacitor 7 through the control module 5, and use the processing module 4 to control the digital potentiometer 8 to set the charging voltage of the energy storage capacitor 7, and then charge each energy storage capacitor 7 through the charging power supply 9; then according to the actual needs of the bypass switch characteristic test and the number of switch coils, the user sends a control instruction to the processing module 4 through the control module 5, and the processing module 4 controls the selection switch 6 to select a suitable energy storage capacitor 7 branch for discharge based on the control instruction; at the same time, the control module 5 sends a control instruction to the drive circuit 11, and the drive circuit 11 controls the thyristor 12 to discharge, triggering a single coil or two coils to close the bypass switch, and the control module 5 simultaneously controls the test module 3 to output a DC 24V test excitation, and the test module 3 converts the test signal returned by the bypass switch into a digital logic level signal and inputs it into the control module 5 for output.

[0058] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A bypass switch characteristic test device, characterized in that: The device includes an energy storage module, a trigger module, a test module, a processing module and a control module; The energy storage module includes an energy storage parallel circuit formed by a plurality of energy storage units connected in parallel, the first port of each branch of the energy storage parallel circuit is respectively connected to one end of a plurality of switch coils of the bypass switch, the other ends of the plurality of switch coils of the bypass switch are all connected to the input end of the trigger module, and the output end of the trigger module is connected to the second port of each branch of the energy storage parallel circuit; The energy storage unit includes a selection switch and multiple energy storage capacitors. The moving contact of the selection switch is connected to the first port on the corresponding branch of the energy storage parallel circuit, the multiple static contacts of the selection switch are respectively connected to one end of the multiple energy storage capacitors, and the other ends of the multiple energy storage capacitors are all connected to the second port on the corresponding branch of the energy storage parallel circuit.

2. A bypass switch characteristic testing device according to claim 1, characterized in that: The energy storage module also includes a digital potentiometer and a charging power supply, one end of the charging power supply is connected to one end of the energy storage parallel circuit, the other end of the charging power supply is connected to the other end of the energy storage parallel circuit, the input end of the digital potentiometer is connected to the first output end of the processing unit, and the output end of the digital potentiometer is connected to the charging power supply.

3. A bypass switch characteristic testing device according to claim 2, characterized in that: A first diode is arranged on each branch of the energy storage parallel circuit, and the first diode is arranged at one end close to the first port of each branch.

4. A bypass switch characteristic testing device according to any one of claims 1 or 2, characterized in that: The trigger module includes multiple drive circuits and multiple thyristors. The output end of the switch coil of the bypass switch is respectively connected to the input end of the multiple thyristors, the output ends of the multiple thyristors are all connected to one end of the energy storage parallel circuit close to the second port, the multiple drive circuits are respectively connected to the multiple thyristors, and the drive circuits correspond to the thyristors one by one.

5. A bypass switch characteristic testing device according to claim 2, characterized in that: A control switch is also provided between the charging power source and the energy storage parallel circuit.

6. A bypass switch characteristic testing device according to claim 1, characterized in that: The number of branches of the energy storage parallel circuit is consistent with the number of switch coils of the bypass switch.

7. A bypass switch characteristic testing device according to claim 4, characterized in that: The number of thyristors is consistent with the number of switch coils of the bypass switch.

8. A bypass switch characteristic testing device according to claim 1, characterized in that: Each energy storage capacitor in the energy storage unit uses capacitors with different capacitance.

9. A bypass switch characteristic testing device according to claim 1, characterized in that: Select the number of static contacts of the switch to be consistent with the number of energy storage capacitors.

10. A bypass switch characteristic testing device according to claim 2, characterized in that: The second output end of the processing module is connected to the trigger module, the third output end of the processing module is connected to the test module, the output end of the control module is connected to the input end of the processing module, one end of the energy storage module is connected to one end of the switch coil of the bypass switch, the other end of the switch coil of the bypass switch is connected to the input end of the trigger module, the output end of the trigger module is connected to the other end of the energy storage module, and the test module is connected to the bypass switch.

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