A gap-type controllable lightning arrester trigger discharge test circuit

Abstract

The invention discloses a gap-type controllable lightning arrester trigger discharge test circuit, which comprises three parts, wherein the first part is a capacitor charging and discharging main circuit, a pulse measuring coil TQ and a passive electro-optical conversion module respectively arranged at a gap high potential end and a ground potential end; the second part is a charging control module, a trigger control module, a voltage synchronization module and a trigger feedback module arranged in a personnel operation area; the third part is an optical fiber connecting the first part and the second part; the pulse measuring coil TQ is connected to the gap trigger circuit, the output of the pulse measuring coil TQ is connected to the passive electro-optical conversion module, and the pulse measuring coil TQ is used to detect the gap trigger pulse; the charging control module corresponds to the capacitor charging main circuit, the trigger control module corresponds to the capacitor discharging main circuit, the voltage synchronization module is connected to the trigger control module, and the trigger feedback module corresponds to the pulse measuring coil TQ and the passive electro-optical conversion module.

Description

Technical Field

[0001] The present invention relates to the research field of overvoltage protection of power systems, and more particularly to a gap-type controllable lightning arrester triggering discharge test circuit. Background Art

[0002] In ultra-high and extra-high voltage power systems, the use of controllable lightning arrester technology can deeply limit system operating overvoltage. Figure 1 The figure shows a specific principle of a gap-type controllable lightning arrester for AC system applications, using a gap as the control element. The gap is a forced-trigger type, with trigger circuits at both the high-potential and ground-potential ends. The trigger circuits consist of a trigger coil, a coaxial cable, and an ignition gap. In actual system applications, the trigger circuit does not require an external trigger source. Instead, it uses the arrester's own operating current i as the trigger source, energizing the trigger coil to generate a trigger voltage. This voltage is then transferred from the coaxial cable to the ignition gap, causing it to break down and generate an initial discharge plasma. Once the plasma is injected into the gap, the electric field forces the gap to conduct.

[0003] However, for the above-mentioned gap-type controllable lightning arrester, although the gap triggering does not require an external trigger source in actual applications, under laboratory conditions, due to the limited capacity of the test power supply, the gap triggering source current i cannot be generated, and it is difficult to use the test power supply to directly carry out the gap triggering discharge test. It is necessary to specially design a gap triggering discharge test circuit to solve the triggering discharge test research problem of the gap-type controllable lightning arrester under laboratory conditions. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides a gap-type controllable lightning arrester trigger discharge test circuit, comprising: three parts, wherein the first part is a capacitor charge and discharge main circuit, a pulse measurement coil TQ, and a passive electro-optical conversion module respectively arranged at the high potential end and the ground potential end of the gap; the second part is a charging control module, a trigger control module, a voltage synchronization module, and a trigger feedback module arranged in the personnel operation area; the third part is an optical fiber connecting the first step part and the second part;

[0005] The capacitor charging and discharging main circuit includes a capacitor charging main circuit and a capacitor discharging main circuit. The capacitor charging main circuit is used to charge the capacitor C; the capacitor discharging main circuit is used to control the discharge of the capacitor C. After the capacitor C is discharged, it forms an oscillation with the inductor L, generating an excitation source current i that triggers the high potential end coil Q1 and the ground potential end coil Q2.

[0006] The pulse measuring coil TQ is connected to the gap trigger circuit, and the output of the pulse measuring coil TQ is connected to the passive electro-optical conversion module. The pulse measuring coil TQ is used to detect the gap trigger pulse;

[0007] The charging control module corresponds to the capacitor charging main circuit, the trigger control module corresponds to the capacitor discharging main circuit, the voltage synchronization module is connected to the trigger control module, and the trigger feedback module corresponds to the pulse measurement coil TQ and the passive electro-optical conversion module.

[0008] Optionally, the capacitor charging main circuit is composed of a battery pack V, a DC / DC charging module, a light-controlled switch K and a capacitor C. The capacitor charging main circuit uses the battery pack V as a power source, and after DC / DC voltage conversion, the light-controlled switch K controls the charging of the capacitor C.

[0009] Optionally, the capacitor discharge main circuit is composed of a capacitor C, a photo-controlled thyristor S and an inductor L. The capacitor discharge main circuit controls the discharge of the capacitor C through the photo-controlled thyristor S. After the capacitor C is discharged, it forms an oscillation with the inductor L, generating an excitation source current i that triggers the high potential end coil Q1 and the ground potential end coil Q2.

[0010] Optionally, the passive electro-optical conversion module converts the electrical pulse signal into an optical pulse signal in a passive manner and then transmits the optical pulse signal through the optical fiber.

[0011] Optionally, the charging control module receives a manual button input to control the light-controlled switch K to be on and off, closing the switch K to charge the capacitor C, and opening the switch K after the capacitor C is charged.

[0012] Optionally, after the capacitor C is fully charged and the switch K is disconnected, the trigger control module triggers the light-controlled thyristor S. After the light-controlled thyristor S is triggered and turned on, the capacitor discharge main circuit will generate the trigger source current i required for the gap.

[0013] Optionally, the voltage synchronization module is used to measure the gap voltage u in real time to achieve time synchronization between the gap trigger and its voltage, and when the voltage reaches a preset value, it synchronously outputs a trigger instruction to the trigger control module to trigger the gap conduction.

[0014] Optionally, the trigger feedback module is used to receive a trigger light pulse signal to provide feedback to an operator on whether the ignition gap is broken down and whether the gap is triggered.

[0015] Optionally, the optical fiber is used for both signal transmission between the first step part and the second part and voltage isolation between the high-voltage area and the operating area.

[0016] The gap-type controllable lightning arrester trigger discharge test circuit proposed in the present invention can carry out gap trigger discharge characteristic tests when the gap voltage reaches any preset value, and has a trigger feedback function to ensure that the gap is forcibly triggered and turned on during each test. Optical fiber transmission can also ensure the safety of high-voltage tests. The present invention is fully functional and safe and reliable, and solves the problem of trigger discharge testing of gap-type controllable lightning arresters under laboratory conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0018] Figure 1 This is the principle diagram of the existing gap-type controllable lightning arrester;

[0019] Figure 2 This is a schematic diagram of the trigger discharge test circuit of the gap-type controllable lightning arrester provided by the present invention. DETAILED DESCRIPTION

[0020] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0021] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0022] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0023] It should also be understood that, in the embodiments of the present invention, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0024] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0025] In addition, the term "and / or" in this invention merely describes an association relationship between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this invention generally indicates that the related objects are in an "or" relationship.

[0026] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced with each other. For the sake of brevity, they will not be described one by one.

[0027] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] The present invention provides a gap type controllable lightning arrester trigger discharge test circuit, such as Figure 2 As shown, the specific implementation is as follows:

[0032] The gap-type controllable lightning arrester trigger discharge test circuit consists of three parts:

[0033] Part 1: The capacitor charging and discharging main circuits, pulse measurement coil TQ, and passive electro-optical conversion module are located at the high-potential and ground-potential ends of the gap, respectively. The capacitor charging main circuit consists of a battery pack V, a DC / DC charging module, a light-controlled switch K, and a capacitor C; the capacitor discharging main circuit consists of a capacitor C, a light-controlled thyristor S, and an inductor L. The high-potential and ground-potential ends share the same structure. The capacitor charging main circuit uses the battery pack V as its power source. After DC / DC voltage conversion, the light-controlled switch K controls the charging of capacitor C. The capacitor discharging main circuit uses the light-controlled thyristor S to control the discharge of capacitor C. After discharge, capacitor C oscillates with inductor L, generating the excitation source current i for the high-potential trigger coil Q1 and the ground-potential trigger coil Q2. The pulse measurement coil TQ is connected to the gap trigger circuit, and its output is connected to the passive electro-optical conversion module. The pulse measurement coil TQ detects the gap trigger pulse, while the passive electro-optical conversion module passively converts the electrical pulse signal into an optical pulse signal, which is then transmitted through an optical fiber.

[0034] Part II: The charging control module, trigger control module, voltage synchronization module, and trigger feedback module are located in the operator's operating area. The charging control module corresponds to the capacitor charging main circuit, receives manual button input, and controls the opening and closing of the light-controlled switch K. Closing switch K charges capacitor C, and disconnecting switch K after capacitor C is fully charged. The trigger control module corresponds to the capacitor discharge main circuit. When capacitor C is fully charged and switch K is disconnected, it triggers the light-controlled thyristor S. After the light-controlled thyristor S is triggered and turned on, the capacitor discharge main circuit will generate the trigger source current i required for the gap. The voltage synchronization module is connected to the trigger control module and measures the gap voltage u in real time to achieve time synchronization between the gap trigger and its voltage. That is, when the voltage reaches a preset value, it synchronously outputs a trigger instruction to the trigger control module to trigger the gap conduction. The trigger feedback module corresponds to the pulse measurement coil TQ and the passive electro-optical conversion module, and is used to receive the trigger light pulse signal to provide feedback to the operator on whether the ignition gap has been broken down and whether the gap has been triggered.

[0035] The third part is the optical fiber connecting the first and second parts. Since the first part is located in the high-voltage area and the second part is in the operating area, the optical fiber is used for both signal transmission between the first and second parts and voltage isolation between the high-voltage area and the operating area.

[0036] Therefore, the gap-type controllable lightning arrester trigger discharge test circuit proposed in the present invention can carry out gap trigger discharge characteristic tests when the gap voltage reaches any preset value, and has a trigger feedback function to ensure that the gap is forcibly triggered and turned on during each test. Optical fiber transmission can also ensure the safety of high-voltage tests. The present invention is fully functional and safe and reliable, and solves the problem of trigger discharge testing of gap-type controllable lightning arresters under laboratory conditions.

[0037] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A gap-type controllable lightning arrester trigger discharge test circuit, characterized in that: It consists of three parts, the first of which is the main capacitor charging and discharging circuit, pulse measurement coil TQ and passive electro-optical conversion module respectively set at the high potential end and ground potential end of the gap; the second part is the charging control module, trigger control module, voltage synchronization module and trigger feedback module set in the personnel operation area; the third part is the optical fiber connecting the first and second parts; The capacitor charging and discharging main circuit includes a capacitor charging main circuit and a capacitor discharging main circuit. The capacitor charging main circuit is used to charge the capacitor C; the capacitor discharging main circuit is used to control the discharge of the capacitor C. After the capacitor C is discharged, it forms an oscillation with the inductor L, generating an excitation source current i that triggers the high potential end coil Q1 and the ground potential end coil Q2. The pulse measuring coil TQ is connected to the gap trigger circuit, and the output of the pulse measuring coil TQ is connected to the passive electro-optical conversion module. The pulse measuring coil TQ is used to detect the gap trigger pulse; The charging control module corresponds to the capacitor charging main circuit, the trigger control module corresponds to the capacitor discharging main circuit, the voltage synchronization module is connected to the trigger control module, and the trigger feedback module corresponds to the pulse measurement coil TQ and the passive electro-optical conversion module; The capacitor discharge main circuit consists of a capacitor C, a light-controlled thyristor S, and an inductor L. The capacitor discharge main circuit controls the discharge of the capacitor C through the light-controlled thyristor S. After the capacitor C is discharged, it forms an oscillation with the inductor L, generating an excitation source current i that triggers the high-potential end coil Q1 and the ground-potential end coil Q2. When the capacitor C is fully charged and the switch K is disconnected, the trigger control module triggers the light-controlled thyristor S. After the light-controlled thyristor S is triggered and turned on, the capacitor discharge main circuit will generate the trigger source current i required for the gap; Among them, the voltage synchronization module is used to measure the gap voltage u in real time to achieve time synchronization between the gap trigger and its voltage. When the voltage reaches the preset value, it synchronously outputs a trigger instruction to the trigger control module to trigger the gap conduction.

2. The gap-type controllable lightning arrester trigger discharge test circuit according to claim 1, characterized in that: The capacitor charging main circuit consists of a battery pack V, a DC / DC charging module, a light-controlled switch K, and a capacitor C. The capacitor charging main circuit uses the battery pack V as a power source. After DC / DC voltage conversion, the light-controlled switch K controls the charging of the capacitor C.

3. The gap-type controllable lightning arrester triggered discharge test circuit according to claim 1, characterized in that: The passive electro-optical conversion module converts electrical pulse signals into optical pulse signals in a passive manner and transmits them through optical fibers.

4. The gap-type controllable lightning arrester triggered discharge test circuit according to claim 1, characterized in that: The charging control module receives manual button input and controls the light-controlled switch K to be opened and closed. When the switch K is closed, the capacitor C is charged. When the capacitor C is charged, the switch K is opened.

5. The gap-type controllable lightning arrester triggered discharge test circuit according to claim 1, characterized in that: The trigger feedback module is used to receive the trigger light pulse signal to provide feedback to the operator on whether the ignition gap is broken down and whether the gap is triggered.

6. The gap-type controllable lightning arrester triggered discharge test circuit according to claim 1, characterized in that: Optical fiber is used for both signal transmission between the first and second parts and voltage isolation between the high-voltage area and the operating area.

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