Device and method for testing operating characteristics of direct-current field suppression switch

Abstract

The invention provides a device and a method for testing the operating characteristics of a direct-current field suppression switch, and relates to the technical field of testing the operating characteristics of the direct-current field suppression switch. The closing control loop is used for controlling closing of the first coil; the first opening control loop is used for controlling opening of the first coil; the second opening control loop is used for controlling opening of the second coil; two ends of the closing control loop, the first opening control loop and the second opening control loop are respectively connected to a power supply positive electrode and a power supply negative electrode; wherein the closing control loop comprises a first closing switch, the first coil and a second closing switch which are sequentially connected in series; the first opening control loop comprises a first opening switch, the first coil and a second opening switch which are sequentially connected in series; and the second opening control loop comprises a third opening switch and the second coil which are sequentially connected in series. According to the scheme, the problems of complex operation and low safety of the DC field suppression switch operation characteristic test can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of DC de-excitation switch action characteristic test, in particular to a DC de-excitation switch action characteristic test device and method. BACKGROUND

[0002] As the core protection device of the excitation system of a large synchronous generator, the core function of the DC de-excitation switch is to cut off thousands of amperes of excitation current in milliseconds when a serious fault (such as stator short circuit or rotor grounding) occurs in the generator or when emergency shutdown is required, and to safely transfer the ultra-high energy level magnetic field energy stored in the rotor winding to the nonlinear de-excitation resistor for dissipation.

[0003] A fast and reliable de-excitation process is the last line of defense for protecting key equipment such as rotor windings, excitation systems, and excitation cables from damage caused by fault currents or induced overvoltages. If the switch fails to act or has poor characteristics, it may result in catastrophic consequences such as rotor winding burnout, insulation breakdown, and excitation equipment destruction.

[0004] During long-term operation, the mechanical mechanisms (such as springs and connecting rods) of the switch, the contact system, and the arc chamber are prone to wear, aging, or carbon deposition, which may result in prolonged action time, transfer failure, or decreased breaking capacity. In the event of an emergency, such deterioration will directly lead to the loss of protection function, causing forced shutdown of large generator sets or severe damage to equipment, resulting in significant economic losses.

[0005] Therefore, it is crucial to conduct action characteristic tests regularly. This test is a key means of assessing the current state of the DC de-excitation switch and discovering potential problems, ensuring that it can reliably act in an emergency and ensuring the safety of equipment and the stability of the power system. Currently, action characteristic tests of DC de-excitation switches rely on temporary manual wiring, which has the problems of complex operation process, high risk of wiring errors, and difficulty in efficiently and accurately detecting the state of the switch. Therefore, a special test device and method are needed to simplify the operation process, improve test safety and accuracy, and ensure the timely discovery of potential problems in the switch. SUMMARY

[0006] Embodiments of the present application provide a DC de-excitation switch action characteristic test device and method to solve the technical problems existing in the prior art.

[0007] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present application.

[0008] According to a first aspect of the embodiments of the present application, a DC de-excitation switch action characteristic test device is provided, the DC de-excitation switch comprising a No. 1 coil and a No. 2 coil, comprising: A closing control circuit for controlling closing of the No. 1 coil, a first opening control circuit for controlling opening of the No. 1 coil, and a second opening control circuit for controlling opening of the No. 2 coil; Two ends of the closing control circuit, the first opening control circuit and the second opening control circuit are respectively connected to a positive electrode of a power supply and a negative electrode of the power supply; The closing control circuit comprises a first closing switch, the No. 1 coil and a second closing switch connected in series. The first opening control circuit comprises a first opening switch, the No. 1 coil and a second opening switch connected in series. The second opening control circuit comprises a third opening switch and the No. 2 coil connected in series.

[0009] In some embodiments of the present application, based on the foregoing scheme, the device further comprises a first terminal row X1; X1:1-X1:3 of the terminal row X1 is connected to the positive electrode of the power supply, and X1:4-X1:6 is connected to the negative electrode of the power supply. The first closing switch is connected to X1:1 of the terminal row X1. The first opening switch is connected to X1:2 of the terminal row X1. The third opening switch is connected to X1:3 of the terminal row X1. The second closing switch is connected to X1:4 of the terminal row X1. The second opening switch is connected to X1:5 of the terminal row X1. The No. 2 coil is connected to X1:6 of the terminal row X1.

[0010] In some embodiments of the present application, based on the foregoing scheme, a first diode is connected in parallel with the No. 2 coil.

[0011] In some embodiments of the present application, based on the foregoing scheme, further comprising: An energy dissipation circuit connected to the first opening control circuit and the second opening control circuit respectively.

[0012] In some embodiments of the present application, based on the foregoing scheme, the energy dissipation circuit comprises: A second diode, a first resistor and a second resistor connected in series. The second diode is connected to the first opening switch. The second resistor is connected to the second opening switch.

[0013] In some embodiments of the present application, based on the foregoing scheme, the direct-current magnetic blowout switch is connected with an aviation plug, and the aviation plug is connected with the second terminal row X2.

[0014] According to a second aspect of the embodiments of the present application, a direct-current magnetic blowout switch action characteristic test method is provided, applied to the device as described in the first aspect, and comprising: 1# coil closing test: close the first closing switch and the second closing switch, turn on the power to make the 1# coil act immediately after power-off, and record the action state; 1# coil opening test: close the first opening switch and the second opening switch, turn on the power to make the 1# coil act immediately after power-off, and record the action state; 2# coil opening test: close the third opening switch, turn on the power to make the 2# coil act immediately after power-off, and record the action state.

[0015] In some embodiments of the present application, based on the foregoing scheme, the process of the 1# coil closing test comprises: connect the positive pole of the power supply and the negative pole of the power supply to the closing control circuit; close the first closing switch and the second closing switch, and keep the first opening switch, the second opening switch and the third opening switch open; close the power output control switch to make the 1# coil conduct electricity, and immediately disconnect the power switch after the closing action of the direct-current magnetic blowout switch is completed; record the closing action response time and the switch state feedback signal, and determine whether the closing function is normal.

[0016] In some embodiments of the present application, based on the foregoing scheme, the process of the 1# coil opening test comprises: connect the positive pole of the power supply and the negative pole of the power supply to the first opening control circuit; close the first opening switch and the second opening switch, and keep the first closing switch, the second closing switch and the third opening switch open; close the power output control switch to make the 1# coil conduct electricity, and immediately disconnect the power switch after the opening action of the direct-current magnetic blowout switch is completed; record the 1# coil opening action response time and the switch state feedback signal, and determine whether the 1# coil function is normal.

[0017] In some embodiments of the present application, based on the foregoing scheme, the process of the 2# coil opening test comprises: connect the positive pole of the power supply and the negative pole of the power supply to the second opening control circuit; close the third opening switch, and keep the other switches, i.e., the first closing switch, the second closing switch, the first opening switch and the second opening switch, open; The power output control switch is closed to energize the No. 2 coil, and the power supply switch is opened immediately after the DC de-excitation switch completes the opening operation. The response time of the No. 2 coil opening operation and the switch state feedback signal are recorded to determine whether the No. 2 coil is normal.

[0018] The technical solution of the present application has the following advantages: 1. Integrated device structure: By integrating the voltage dividing resistor, diode, control switch and terminal row, the test wiring process is simplified, the amount of manual operation is reduced, and the risk of wiring errors is reduced. 2. High operation safety: By setting the voltage dividing current limiting element and the clear "power off immediately after operation" operation specification, the problem of overheating and burning caused by long-time energization of the coil is avoided, and the safety of personnel and equipment is improved. 3. Strong detection accuracy: The closing operation, No. 1 coil opening operation and No. 2 coil opening operation can be tested independently, the action response time and state feedback can be accurately captured, potential hazards such as mechanical mechanism wear and abnormal contact can be found in time, and the non-stop accident of the generator caused by poor switch characteristics can be avoided. 4. Good versatility: It is suitable for testing different types of large synchronous generator DC de-excitation switches, and has a wide range of applications.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings herein are incorporated into the specification and form part of the specification, show embodiments consistent with the present application, and together with the specification serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art. In the drawings: Figure 1 Fig. 1 shows a circuit schematic diagram of a DC de-excitation switch operation characteristic testing device according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations, however, can be implemented in many different ways and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

[0022] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.

[0023] It should be noted that the terms "first", "second", and so on as used in the description and the claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the objects thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described.

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Some embodiments of the present application will be described in detail below with reference to the drawings. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0026] To solve the problems of complex operation and low safety of the action characteristic test of the existing direct-current de-excitation switch, the embodiments of the present application provide a direct-current de-excitation switch action characteristic test device.

[0027] The direct-current de-excitation switch includes a No. 1 coil and a No. 2 coil. The device includes a closing control circuit for controlling the No. 1 coil, a first opening control circuit for controlling the No. 1 coil, and a second opening control circuit for controlling the No. 2 coil. The closing control circuit, the first opening control circuit, and the second opening control circuit are respectively connected to a positive electrode and a negative electrode of a power supply. The closing control circuit includes a first closing switch, the No. 1 coil, and a second closing switch connected in series. The first opening control circuit includes a first opening switch, the No. 1 coil, and a second opening switch connected in series. The second opening control circuit comprises a third opening switch and the No. 2 coil connected in series.

[0028] It should be noted that in the embodiment, when the first closing switch and the second closing switch are closed, the No. 1 coil is closed and powered on. When the first opening switch and the second opening switch are closed, the No. 1 coil is opened and powered on. When the third opening switch is closed, the No. 2 coil is opened and powered on.

[0029] For example, referring to Figure 1 , a circuit schematic diagram of a DC magnetic blowout switch action characteristic test device according to an embodiment of the application is shown.

[0030] As shown in Figure 1 , one end of the first closing switch K1 is connected to the positive pole of the power supply, and the other end is connected to the No. 1 coil of the DC magnetic blowout switch Q02. One end of the second closing switch K11 is connected to the negative pole of the power supply, and the other end is connected to the No. 1 coil of the DC magnetic blowout switch Q02. The first closing switch K1, the No. 1 coil of the DC magnetic blowout switch Q02, and the second closing switch K11 form a closing control circuit.

[0031] As shown in Figure 1 , one end of the first opening switch K2 is connected to the positive pole of the power supply, and the other end is connected to the No. 1 coil of the DC magnetic blowout switch Q02. One end of the second opening switch K22 is connected to the negative pole of the power supply, and the other end is connected to the No. 1 coil of the DC magnetic blowout switch Q02. The first opening switch K2, the No. 1 coil of the DC magnetic blowout switch Q02, and the second opening switch K22 form a first opening control circuit.

[0032] As shown in Figure 1 , one end of the third opening switch K3 is connected to the positive pole of the power supply, and the other end is connected to the No. 2 coil of the DC magnetic blowout switch Q02. The other end of the No. 1 coil of the DC magnetic blowout switch Q02 is connected to the negative pole of the power supply. The third opening switch K3 and the No. 2 coil of the DC magnetic blowout switch Q02 form a second opening control circuit.

[0033] In some possible embodiments, based on the foregoing scheme, the device further comprises: a first terminal row X1; X1:1-X1:3 of the terminal row X1 are connected to the positive pole of the power supply, and X1:4-X1:6 are connected to the negative pole of the power supply. The first closing switch is connected to X1:1 of the terminal row X1. The first opening switch is connected to X1:2 of the terminal row X1. The third opening switch is connected to X1:3 of the terminal row X1. The second closing switch is connected to X1:4 of the terminal row X1. The second trip switch is connected to X1:5 of the terminal block X1; The No. 2 coil is connected to X1:6 of the terminal block X1.

[0034] For example, such as Figure 1 As shown, the first closing switch K1 is connected to X1:1 of terminal block X1; the first opening switch K2 is connected to X1:2 of terminal block X1; the third opening switch K3 is connected to X1:3 of terminal block X1; X1:1, X1:2 and X1:3 of terminal block X1 are all connected to the positive terminal of the power supply.

[0035] The second closing switch K11 is connected to X1:4 of terminal block X1; the second opening switch K22 is connected to X1:5 of terminal block X1; the second coil of DC demagnetizing switch Q02 is connected to X1:6 of terminal block X1; X1:4, X1:5 and X1:6 of terminal block X1 are all connected to the negative terminal of the power supply.

[0036] In some feasible embodiments, based on the aforementioned scheme, a first diode is connected in parallel with the second coil.

[0037] For example, such as Figure 1 As shown, a first diode V21 is connected in parallel to the No. 2 coil of the DC demagnetizing switch Q02. This diode is used for reverse cutoff to prevent reverse voltage in the circuit from damaging the components.

[0038] In some feasible embodiments, based on the foregoing scheme, the following further applies: An energy dissipation circuit is provided, which is connected to the first trip control circuit and the second trip control circuit respectively.

[0039] In some feasible embodiments, based on the foregoing scheme, the energy dissipation loop includes: The second diode, the first resistor, and the second resistor are connected in series. The second diode is connected to the first trip switch; The second resistor is connected to the second trip switch.

[0040] For example, such as Figure 1 As shown, the energy dissipation circuit consists of a second diode V22, a first resistor R21, and a second resistor R22 connected in series. One end of the second diode V22 is connected to the closing control circuit and the first opening control circuit, respectively, and the other end is connected to the first resistor R21. The other end of the first resistor R21 is connected to the closing control circuit and the second resistor R22, and the other end of the second resistor R22 is connected to the second opening switch K22.

[0041] The first resistor R21 and the second resistor R22 are used for voltage division and current limiting, and ensure that the circuit elements work in the rated current range; the second diode V22 is used for reverse blocking, and prevents the elements from being damaged by reverse voltage in the circuit.

[0042] In some possible embodiments, based on the foregoing scheme, the DC magnetic blowout switch is connected with an aviation plug, and the aviation plug is connected with the second terminal row X2.

[0043] It should be noted that, in the embodiment, the terminal rows X1 and X2 and the aviation plug are used to realize circuit connection and signal feedback, and assist in monitoring the on-off state of the circuit.

[0044] In the embodiment of the application, a DC magnetic blowout switch action characteristic test method is also provided, which is applied to the device in any of the foregoing embodiments, and specifically includes the following steps: 1# coil closing test: close the first closing switch and the second closing switch, turn on the power supply to make the 1# coil act immediately, and then turn off the power supply to record the action state; 1# coil opening test: close the first opening switch and the second opening switch, turn on the power supply to make the 1# coil act immediately, and then turn off the power supply to record the action state; 2# coil opening test: close the third opening switch, turn on the power supply to make the 2# coil act immediately, and then turn off the power supply to record the action state.

[0045] In some possible embodiments, based on the foregoing scheme, the process of the 1# coil closing test includes the following steps: connect the positive pole of the power supply and the negative pole of the power supply to the closing control circuit; close the first closing switch and the second closing switch, and keep the first opening switch, the second opening switch and the third opening switch open; close the power supply output control switch to make the 1# coil be electrified, and then immediately turn off the power supply switch after the DC magnetic blowout switch completes the closing action; record the closing action response time and the switch state feedback signal, and determine whether the closing function is normal.

[0046] It should be noted that, in the embodiment, connecting the positive pole of the power supply and the negative pole of the power supply to the closing control circuit specifically means: connect the positive pole of the power supply to X1:1 of the terminal row X1, and connect the negative pole of the power supply to X1:4; and connect the female head of the aviation plug connected to the terminal row X2 to the male head on the DC magnetic blowout switch Q02.

[0047] In some possible embodiments, based on the foregoing scheme, the process of the 1# coil opening test includes the following steps: connect the positive pole of the power supply and the negative pole of the power supply to the first opening control circuit; Close the first and second opening switches, and keep the first, second closing switches and third opening switch open; Close the power output control switch to energize the No. 1 coil, and immediately open the power switch after the DC de-excitation switch completes the opening operation. Record the response time of the No. 1 coil opening operation and the switch state feedback signal to determine whether the No. 1 coil is functioning properly.

[0048] It should be noted that, in this embodiment, connecting the positive and negative power supply to the first opening control circuit specifically means: Connecting the positive power supply to X1:2 of the terminal row X1, and the negative power supply to X1:5; and connecting the female head of the aviation plug on the terminal row X2 to the male head on the DC de-excitation switch Q02.

[0049] In some feasible embodiments, based on the foregoing scheme, the process of the No. 2 coil opening test includes: Connecting the positive and negative power supply to the second opening control circuit; Closing the third opening switch, and keeping the first and second closing switches and the first and second opening switches open; Closing the power output control switch to energize the No. 2 coil, and immediately opening the power switch after the DC de-excitation switch completes the opening operation. Recording the response time of the No. 2 coil opening operation and the switch state feedback signal to determine whether the No. 2 coil is functioning properly.

[0050] It should be noted that, in this embodiment, connecting the positive and negative power supply to the second opening control circuit specifically means: Connecting the positive power supply to X1:3 of the terminal row X1, and the negative power supply to the No. 2 coil; and connecting the female head of the aviation plug on the terminal row X2 to the male head on the DC de-excitation switch Q02.

[0051] In summary, the technical scheme of the present application has the following advantages: 1. Integrated device structure: By integrating the voltage dividing resistor, diode, control switch and terminal row, the test wiring process is simplified, the amount of manual operation is reduced, and the risk of wiring errors is reduced. 2. High operation safety: By setting the voltage dividing current limiting element and the clear “immediately power off after operation” operation specification, the problem of overheating and burning caused by long-time energization of the coil is avoided, and the safety of personnel and equipment is improved. 3. Strong detection accuracy: The closing operation, No. 1 coil opening operation and No. 2 coil opening operation can be tested independently, the action response time and state feedback can be accurately captured, potential hidden dangers such as mechanical mechanism wear and abnormal contact can be found in time, and the non-stop accident of the generator caused by poor switch characteristics can be avoided. 4. Good versatility: suitable for testing different models of large synchronous generator DC de-excitation switch, wide application range.

[0052] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

Claims

1. A device for testing the operating characteristics of a direct current de-excitation switch, said direct current de-excitation switch comprising a No. 1 coil and a No. 2 coil, characterized by, The device comprises: a closing control circuit for controlling closing of the No. 1 coil, a first opening control circuit for controlling opening of the No. 1 coil, and a second opening control circuit for controlling opening of the No. 2 coil; two ends of the closing control circuit, the first opening control circuit and the second opening control circuit are respectively connected to a positive pole of a power supply and a negative pole of the power supply; the closing control circuit comprises a first closing switch, the No. 1 coil and a second closing switch connected in series; the first opening control circuit comprises a first opening switch, the No. 1 coil and a second opening switch connected in series; the second opening control circuit comprises a third opening switch and the No. 2 coil connected in series.

2. The apparatus of claim 1, wherein, The device further comprises a first terminal row X1; X1:1-X1:3 of the terminal row X1 is connected to the positive pole of the power supply, and X1:4-X1:6 is connected to the negative pole of the power supply; the first closing switch is connected to X1:1 of the terminal row X1; the first opening switch is connected to X1:2 of the terminal row X1; the third opening switch is connected to X1:3 of the terminal row X1; the second closing switch is connected to X1:4 of the terminal row X1; the second opening switch is connected to X1:5 of the terminal row X1; the No. 2 coil is connected to X1:6 of the terminal row X1.

3. The apparatus of claim 1, wherein, A first diode is connected in parallel to the No. 2 coil.

4. The apparatus of claim 1, wherein, The device further comprises: an energy dissipation circuit connected to the first opening control circuit and the second opening control circuit respectively.

5. The apparatus of claim 4, wherein, The energy dissipation circuit comprises: a second diode, a first resistor and a second resistor connected in series; the second diode is connected to the first opening switch; the second resistor is connected to the second opening switch.

6. The apparatus of claim 4, wherein, An aviation plug is connected to the DC de-excitation switch, and the aviation plug is connected to a second terminal row X2.

7. A method for testing the operating characteristics of a DC breaker, applied to the device according to any one of claims 1-6, characterized in that, The device comprises: No. 1 coil closing test: close the first closing switch and the second closing switch, turn on the power supply to make the No. 1 coil act, then turn off the power supply immediately, and record the action state; No. 1 coil opening test: close the first opening switch and the second opening switch, turn on the power supply to make the No. 1 coil act, then turn off the power supply immediately, and record the action state; No. 2 coil opening test: close the third opening switch, turn on the power supply to make the No. 2 coil act, then turn off the power supply immediately, and record the action state.

8. The method of claim 7, wherein, The process of the No. 1 coil closing test comprises: connect the positive pole of the power supply and the negative pole of the power supply to the closing control circuit; close the first closing switch and the second closing switch, and keep the first opening switch, the second opening switch and the third opening switch open; close the power supply output control switch to make the No. 1 coil conduct electricity, and then turn off the power supply switch immediately after the DC de-excitation switch completes the closing action; record the closing action response time and the switch state feedback signal, and determine whether the closing function is normal.

9. The method of claim 7, wherein, The process of the No. 1 coil opening test comprises: connect the positive pole of the power supply and the negative pole of the power supply to the first opening control circuit; close the first opening switch and the second opening switch, and keep the first closing switch, the second closing switch and the third opening switch open; close the power supply output control switch to make the No. 1 coil conduct electricity, and then turn off the power supply switch immediately after the DC de-excitation switch completes the opening action; Record the response time of the No.1 coil tripping action and the feedback signal of the switch state to determine whether the No.1 coil is normal.

10. The method of claim 7, wherein, The process of the No.2 coil tripping test includes: connect the positive pole and the negative pole of the power supply to the second tripping control circuit; close the third tripping switch and keep the first closing switch, the second closing switch, the first tripping switch and the second tripping switch open; close the power supply output control switch to energize the No.2 coil, and immediately disconnect the power supply switch after the DC de-excitation switch completes the tripping action; Record the response time of the No.2 coil tripping action and the feedback signal of the switch state to determine whether the No.2 coil is normal.

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