Capacitive voltage transformer with change-over switch, measuring method and system

Abstract

The embodiment of the invention discloses a capacitor voltage transformer with a change-over switch, a measuring method and a measuring system.The capacitor voltage transformer with the change-over switch comprises a capacitor unit, a lower end oil tank, a change-over switch controller and an electromagnetic unit installed in the oil tank, the electromagnetic unit comprises an intermediate transformer, a lightning arrester, a damping device, a first change-over switch, a second change-over switch and a compensation reactor, the change-over switch controller is externally connected with the oil tank, and the change-over switch controller controls the closing state of the first change-over switch and the closing state of the second change-over switch. According to the invention, the change-over switch is arranged in the capacitive voltage transformer, so that the measurement and maintenance of part of elements of the electromagnetic unit can be safely and conveniently carried out under the condition that the normal operation of the capacitive voltage transformer is not influenced, thereby improving the measurement efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical testing, and in particular to a capacitive voltage transformer with a switching switch, a measuring method and a system. Background Art

[0002] Capacitor Voltage Transformer (CVT) is a widely used device in power systems, mainly used to convert the voltage signal on the high voltage side into a low voltage signal for monitoring and measurement. The design of CVT usually includes two main parts: a capacitor voltage divider and an electromagnetic unit. The capacitor voltage divider is responsible for converting the high voltage into a relatively low voltage, while the electromagnetic unit further converts this low voltage signal into a standard signal that can be read by the instrument. Over time, the performance of the capacitor unit and the electromagnetic unit may be affected by various factors, such as environmental changes, equipment aging, etc. Therefore, in order to ensure the long-term reliability and accuracy of the CVT, it must be regularly maintained and inspected.

[0003] However, existing CVT designs have some limitations when conducting these tests under field conditions. Measuring some components of the electromagnetic unit can be very difficult and time-consuming due to its complex structure and highly integrated design. Existing detection technologies are unable to monitor and evaluate the key components of the electromagnetic unit in real time when the equipment is running, making detection and maintenance more difficult, which may miss potential performance issues and even affect the normal operation of the equipment. Summary of the invention

[0004] The main purpose of the present invention is to provide a capacitive voltage transformer with a switching switch, a measuring method and a system, which are used to solve the technical problem that the electromagnetic unit components in the capacitive voltage transformer cannot be detected.

[0005] To achieve the above-mentioned objectives, the first aspect of the present application provides a capacitive voltage transformer with a switching switch, including a capacitor unit, a lower oil tank, a switching switch controller, and an electromagnetic unit installed in the oil tank, the electromagnetic unit including an intermediate transformer, a lightning arrester, a damping device, a first switching switch, a second switching switch and a compensating inductor, the switching switch controller is externally connected to the oil tank, and the switching switch controller controls the closed state of the first switching switch and the second switching switch.

[0006] Optionally, one end of the capacitor unit is grounded, and the other end of the capacitor unit is connected in parallel to the intermediate transformer.

[0007] Optionally, the first end of the primary winding of the intermediate transformer is connected to the capacitor unit, the second end of the primary winding of the intermediate transformer is connected to the first end of the compensating inductor, the secondary winding of the intermediate transformer is connected in parallel with the damping device, the second end of the compensating inductor is grounded, the lightning arrester is connected in parallel with the compensating inductor, one end of the first switching switch is connected to the first grounding terminal of the oil tank, the other end of the first switching switch is connected to the first end of the primary winding of the intermediate transformer, the first end of the second switching switch is connected to the parallel circuit between the lightning arrester and the compensating inductor, the second end of the second switching switch is connected to the first end of the lightning arrester, the third end of the second switching switch is connected to the second grounding terminal of the oil tank, and the second end of the lightning arrester is grounded.

[0008] Optionally, when the capacitor voltage transformer with a switching switch is in a first mode, the switching switch controller controls the first switching switch to be in an open state, and the line between the intermediate transformer and the first grounding terminal of the oil tank is disconnected. The switching switch controller controls the second switching switch to be in a first closed state, and the second switching switch connects the lightning arrester and the parallel line between the lightning arrester and the compensating reactor, and disconnects the line between the second grounding terminal of the oil tank.

[0009] Optionally, when the capacitor voltage transformer with a switching switch is in the second mode, the switching switch controller controls the first switching switch to be in a closed state, connecting the intermediate transformer and the line at the first grounding terminal of the oil tank, and the switching switch controller controls the second switching switch to be in a second closed state, and the second switching switch connects the lightning arrester and the line at the second grounding terminal of the oil tank.

[0010] On the other hand, the present application further provides a measurement method, which is applied to a switch controller in a capacitor voltage transformer with a switch, wherein the capacitor voltage transformer with a switch further includes a first switch and a second switch, and the method includes:

[0011] Sending a control signal to the first switch and the second switch according to the operation mode of the capacitor voltage transformer with a switch;

[0012] According to the control signal, controlling the closing state of the first switch and the second switch to obtain a measurement circuit;

[0013] According to the measuring circuit, the capacitor voltage transformer with a switching switch is measured.

[0014] On the other hand, the present application further provides a measurement system, which is applied to a capacitor voltage transformer with a switching switch, so that the capacitor voltage transformer with a switching switch performs the steps of the second aspect and any possible implementation method thereof.

[0015] On the other hand, the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes each step of the method described in the second aspect.

[0016] The beneficial effects of the present invention are as follows: by controlling the closing state of the first switching switch and the second switching switch, the present invention can flexibly adjust the working mode of the capacitor voltage transformer with a switching switch, which helps to obtain more accurate data during the measurement and maintenance process, improve detection accuracy and reliability, and adapt to different operating requirements and measurement scenarios. Furthermore, through the external design of the switching switch controller, the intervention inside the oil tank is reduced, thereby reducing the complexity and risk during the maintenance and repair process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in:

[0019] Figure 1A A schematic diagram of the structure of a capacitive voltage transformer with a switching switch provided in an embodiment of the present application;

[0020] Figure 1B A circuit diagram of a capacitive voltage transformer with a switching switch provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a measurement method according to an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a measurement system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The technical solution of the present application can be applied to various capacitive voltage transformer scenarios with switching switches.

[0027] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0028] See also Figure 1A , is a schematic diagram of a capacitive voltage transformer with a switching switch provided in an embodiment of the present application, such as Figure 1A As shown, a capacitive voltage transformer 10 with a switching switch includes a capacitor unit 20, a lower oil tank 30, a switching switch controller 40, and an electromagnetic unit 50 installed in the oil tank. The electromagnetic unit includes an intermediate transformer 60, a lightning arrester 70, a damping device 80, a first switching switch 90, a second switching switch 100 and a compensating inductor 110. The switching switch controller 40 is externally connected to the oil tank 30, and the switching switch controller 40 controls the closed state of the first switching switch 90 and the second switching switch 100.

[0029] Among them, the oil tank is the external protection oil tank of the capacitive voltage transformer, which provides physical protection and insulation functions; the capacitor unit may include multiple capacitors, which are designed to divide the high-voltage side voltage and convert it into a low-voltage signal. The capacitors in the capacitor unit usually include a first capacitor and a second capacitor. The above capacitors are connected in series or in parallel to achieve the required voltage division function; the intermediate transformer is responsible for further converting the low-voltage signal output by the capacitor unit into a standard measurable voltage signal; the lightning arrester is used to protect the electromagnetic unit and the entire capacitive voltage transformer from the influence of lightning overvoltage, Ensure the safe and stable operation of the equipment; the damping device is composed of a damping resistor Rd, a damping reactance L, and a damping capacitor C. Under the power frequency condition, the damping reactance L and the damping capacitor C work in a parallel resonance state, the circuit presents a high impedance, and consumes only a small amount of power. When the CVT is disturbed and enters the frequency division resonance overvoltage, the damping reactance L and the damping capacitor C stop the resonance working state due to the frequency change, the circuit presents a low impedance, and the resonance overvoltage is suppressed by the damping resistor Rd; the compensating reactor is used to adjust the reactance value in the circuit to ensure that the capacitive voltage transformer maintains stability and accuracy under different working conditions.

[0030] Among them, the first switching switch is used to control the current path in the electromagnetic unit, and different working states or test configurations can be selected; the second switching switch is similar to the first switching switch, and is used to further adjust the working state of the electromagnetic unit, which is usually related to the connection of the compensating inductor and the lightning arrester.

[0031] The switch controller can send a control signal to the first switch and the second switch to control the closed state of the first switch and the closed state of the second switch, thereby conveniently adjusting the working state of the capacitive voltage transformer.

[0032] Further, the control signal of the switching switch controller can be sent according to wireless technology, such as Wi-Fi, Bluetooth, ZigBee or long-distance LoRa technology, to achieve remote communication with the first and second switching switches. This communication not only provides a larger control distance, but also increases the flexibility of deployment. Alternatively, the control signal of the switching switch controller can be sent according to wired technology, such as the switching switch controller is connected to a line with the first switching switch and the second switching switch respectively, which is not limited here.

[0033] One end of the capacitor unit 20 is grounded, and the other end of the capacitor unit 20 is connected in parallel with the intermediate transformer 60 .

[0034] Optionally, the capacitor unit includes a first capacitor and a second capacitor, the first capacitor is connected in series with the second capacitor, one end of the first capacitor is grounded, the other end of the first capacitor is connected to the second capacitor, and the connection point between the first capacitor and the second capacitor (i.e., their series connection point) is connected in parallel with the high voltage end of the intermediate transformer.

[0035] Among them, the first end of the primary winding of the intermediate transformer 60 is connected to the capacitor unit 20, the second end of the primary winding of the intermediate transformer 60 is connected to the first end of the compensating inductor 110, the secondary winding of the intermediate transformer 60 is connected in parallel with the damping device 80, the second end of the compensating inductor 110 is grounded, the lightning arrester 70 is connected in parallel with the compensating inductor 110, one end of the first switching switch 90 is connected to the first grounding end of the oil tank 30, the other end of the first switching switch 90 is connected to the first end of the primary winding of the intermediate transformer 60, the first end of the second switching switch 100 is connected to the parallel circuit between the lightning arrester 70 and the compensating inductor 110, the second end of the second switching switch 100 is connected to the first end of the lightning arrester 70, the third end of the second switching switch 100 is connected to the second grounding end of the oil tank 30, and the second end of the lightning arrester 70 is grounded.

[0036] Among them, you can refer to Figure 1B , Figure 1B A circuit diagram of a capacitive voltage transformer with a switching switch provided in an embodiment of the present application. Figure 1B In the figure, N, XL, D, C, E, and F are all connection points, among which N, XL, E, and F are grounding terminals, and D and C are connection points of the line.

[0037] Among them, when the capacitor voltage transformer 10 with a switching switch is in the first mode, the switching switch controller 40 controls the first switching switch 90 to be in an open state, and the line between the intermediate transformer 60 and the first grounding terminal of the oil tank 30 is disconnected. The switching switch controller 40 controls the second switching switch 100 to be in a first closed state, and the second switching switch 100 connects the lightning arrester 70 and connects the lightning arrester 70 and the parallel line of the compensating inductor 110, and disconnects the line of the second grounding terminal of the oil tank 30.

[0038] The first mode may be a normal operating mode. In the normal operating mode, the capacitor voltage transformer with a switching switch is designed to ensure the stability and safety of the equipment. The first switching switch is in the open state, ensuring that there is no direct current path between the intermediate transformer and the grounding terminal of the oil tank, which helps to avoid electrical interference and reduce the current load of the equipment. The second switching switch is in the closed state, ensuring that the lightning arrester and the compensating reactor work normally, thereby providing overvoltage protection and reactance regulation, and ensuring that the grounding of the oil tank does not participate in the circuit in this mode.

[0039] In a specific implementation, the switch controller sets the first switch to an open state. In this state, the first switch disconnects the line between the intermediate transformer and the first grounding terminal of the oil tank, that is, the electrical connection between the high voltage terminal of the intermediate transformer and the grounding terminal of the oil tank is cut off, thereby preventing the current from flowing through the path.

[0040] In a specific implementation, the switching switch controller places the second switching switch in a first closing state. The second switching switch is used to connect the parallel circuit of the lightning arrester and the compensating inductor. The lightning arrester provides overvoltage protection for the capacitive voltage transformer. At the same time, the compensating inductor is connected in parallel with the lightning arrester to adjust the reactance value of the circuit. At this time, the line of the second grounding terminal of the oil tank is cut off, thereby preventing direct electrical connection between the grounding terminal and the circuit.

[0041] Among them, when the capacitor voltage transformer 10 with a switching switch is in the second mode, the switching switch controller 40 controls the first switching switch 90 to be in a closed state, connecting the intermediate transformer 60 and the line of the first grounding terminal of the oil tank 30, and the switching switch controller 40 controls the second switching switch 100 to be in a second closed state, and the second switching switch 100 connects the lightning arrester 70 and the line connecting the second grounding terminal of the oil tank 30.

[0042] Among them, the second mode can be a measurement mode. In the measurement mode, the high-voltage end of the intermediate transformer is directly connected to the grounding end of the oil tank. This connection provides a complete current path, so that the performance and electrical status of the intermediate transformer can be accurately detected during the measurement process; ensure that the grounding ends of the lightning arrester and the oil tank are connected to the measurement circuit, thereby stabilizing the electrical environment during the measurement process and ensuring the accuracy of the measurement data. Through this connection, the measurement system can obtain comprehensive electrical characteristics, including the performance of the lightning arrester and the grounding system.

[0043] It can be seen that in this embodiment, when conducting the test of the key components of the electromagnetic unit of the capacitive voltage transformer, there is no need to dismantle the equipment, which saves a lot of manpower and time, and can regularly and accurately detect the key components of the electromagnetic unit, timely discover and solve potential problems, avoid equipment damage caused by long-term non-detection, thereby extending the service life of the capacitive voltage transformer, reducing power outages caused by the failure to timely discover potential faults in the CVT electromagnetic unit, and ensuring the stable operation of the power system.

[0044] In a specific implementation, the switch controller sets the first switch to a closed state. In this state, the first switch is closed, connecting the line between the intermediate transformer and the first grounding terminal of the oil tank, indicating that the high voltage end of the intermediate transformer is directly electrically connected to the grounding terminal of the oil tank, so that the current can flow through this path during the measurement process.

[0045] In a specific implementation, the switching switch controller places the second switching switch in the second closing state, maintains the connection between the lightning arrester and the circuit to continue to provide overvoltage protection, connects the second grounding terminal of the oil tank to the circuit, and ensures that the grounding terminal of the oil tank is effectively grounded during the measurement process to stabilize the measurement results and prevent electrical interference.

[0046] The beneficial effects of the present invention are as follows: by controlling the closing state of the first switching switch and the second switching switch, the present invention can flexibly adjust the working mode of the capacitor voltage transformer with a switching switch, which helps to obtain more accurate data during the measurement and maintenance process, improve detection accuracy and reliability, and adapt to different operating requirements and measurement scenarios. Furthermore, through the external design of the switching switch controller, the intervention inside the oil tank is reduced, thereby reducing the complexity and risk during the maintenance and repair process.

[0047] See also Figure 2 , is a flow chart of a measurement method provided in an embodiment of the present application, such as Figure 2 As shown, a switch controller is applied to a capacitor voltage transformer with a switch, wherein the capacitor voltage transformer with a switch further includes a first switch and a second switch, and the method includes:

[0048] 101. Send a control signal to the first switch and the second switch according to an operation mode of the capacitor voltage transformer with a switch.

[0049] The operation mode includes a first mode and a second mode. The first mode may be a normal operation mode; the second mode may be a measurement mode.

[0050] The specific description of the control signal has been described in the previous embodiment and will not be repeated here.

[0051] In one embodiment, sending a control signal to the first switching switch and the second switching switch according to the operating mode of the capacitor voltage transformer with a switching switch includes: when the capacitor voltage transformer with a switching switch is in the first mode, sending a disconnect instruction to the first switching switch, and sending a first close instruction to the second switching switch; or, when the capacitor voltage transformer with a switching switch is in the second mode, sending a second close instruction to the first switching switch, and sending a third close instruction to the second switching switch.

[0052] Among them, the above-mentioned disconnection instruction is used to control the opening of the first switching switch, which helps to isolate the electricity during normal operation and avoid electrical interference; the above-mentioned first closing instruction is used to control the second switching switch to be in the first closing state, that is, the lightning arrester and the compensating inductor are connected in parallel to provide overvoltage protection and ensure stable operation of the system.

[0053] Among them, the second closing instruction is used to control the closing of the first switching switch, providing a complete measurement current path, which helps to accurately obtain equipment performance data; the above-mentioned third closing instruction is used to control the second switching switch to be in the second closing state, ensuring the stability of the electrical environment during the measurement process and providing reliable measurement results.

[0054] It can be seen that in this embodiment, by accurately controlling the switch state, the equipment configuration can be flexibly adjusted according to actual needs, thereby achieving the best working effect and maintenance efficiency.

[0055] 102. According to the control signal, control the closing states of the first switch and the second switch to obtain a measurement circuit.

[0056] The measurement circuit refers to the electrical path or connection method formed when the device enters the measurement mode. This circuit can be used to perform various electrical measurements and tests.

[0057] For example, in the measurement mode, the closed state of the switch causes the high voltage end of the intermediate transformer to be directly grounded and connected to the ground terminal of the oil tank, providing a suitable electrical environment for measuring electrical parameters such as resistance, inductance, insulation status, etc.

[0058] It can be seen that in this embodiment, by accurately controlling the closed state of the first switch and the second switch, the obtained measurement circuit ensures that the capacitive voltage transformer can perform accurate and stable electrical testing in the measurement mode, thereby improving the testing effect and operation convenience of the equipment.

[0059] 103. According to the measurement circuit, measure the capacitor voltage transformer with a switching switch.

[0060] The above measurements may include but are not limited to: capacitance measurement, insulation test, current and voltage test and resistance measurement. Capacitance measurement is to measure the capacitance value of the capacitor unit to confirm whether it meets the design parameters; insulation test is to check the insulation performance of the capacitive voltage transformer, including the insulation status of the intermediate transformer and the ground terminal; current and voltage test is to measure the output current and voltage of the intermediate transformer to ensure that it works within the specified range; resistance measurement is to check the resistance value of the compensating reactor to evaluate its working status and effectiveness.

[0061] Optionally, after the measurement, a measurement result is obtained. After the measurement is completed, the obtained data is analyzed to evaluate whether the overall performance of the capacitor voltage transformer meets the standards and specifications. If performance degradation or failure is found, corresponding maintenance or component replacement can be performed according to the measurement results.

[0062] It can be seen that in this embodiment, the key components of the capacitive voltage transformer can be accurately measured without power outage, which greatly improves the maintenance efficiency and reliability of the power system.

[0063] This method can flexibly control the operating state of the voltage transformer by sending control signals to the first switching switch and the second switching switch. It can be applied to the normal operating mode or switched to the measurement mode, thereby optimizing the operating efficiency and performance of the equipment. Furthermore, during equipment maintenance or testing, by switching to different operating modes and controlling the switch state, comprehensive measurement and evaluation can be performed without disassembling the equipment.

[0064] In one embodiment, when the capacitor voltage transformer with a switching switch is in the first mode, the control signal includes a disconnection instruction and a first closing instruction, and the closing state of the first switching switch and the second switching switch is controlled according to the control signal to obtain a measurement circuit, including: according to the disconnection instruction, the first switching switch is controlled to be in an open state to obtain a first measurement circuit, in which the intermediate transformer in the capacitor voltage transformer with a switching switch is disconnected from the grounding terminal of the oil tank; according to the first closing instruction, the second switching switch is controlled to be in a first closed state to obtain a second measurement circuit, in which the lightning arrester in the capacitor voltage transformer with a switching switch is connected to the parallel circuit of the compensating inductor and is in an ungrounded state.

[0065] The first measurement circuit is formed when the first switching switch is in the open state and the second switching switch is in the first closed state. The first measurement circuit allows the insulation state of the capacitor unit to be measured without affecting the normal operation of the intermediate transformer.

[0066] Among them, the second measurement circuit is formed when the first switching switch is in the closed state and the second switching switch is in the second closed state. The second measurement circuit is mainly used to provide overvoltage protection to ensure that when the voltage suddenly rises, the lightning arrester and the compensating inductor can intervene quickly to protect the voltage transformer and the entire power system from damage.

[0067] It can be seen that in this embodiment, by configuring the measurement circuit, interference with the normal operation of the device during the test process can be avoided, ensuring that the device is stable and reliable during the test process, and avoiding inaccurate results or device damage caused by improper measurement settings.

[0068] In one embodiment, when the capacitor voltage transformer with a switching switch is in the second mode, the control signal includes a second closing instruction and a third closing instruction, and the closing state of the first switching switch and the second switching switch is controlled according to the control signal to obtain a measurement circuit, including: according to the second closing instruction, the first switching switch is controlled to be in a closed state to obtain a third measurement circuit, in which the intermediate transformer in the capacitor voltage transformer with a switching switch is connected to the grounding terminal of the oil tank; according to the third closing instruction, the second switching switch is controlled to be in a second closed state to obtain a fourth measurement circuit, and the lightning arrester in the capacitor voltage transformer with a switching switch in the second measurement circuit is in a grounded state.

[0069] Among them, the third measurement circuit is that when the first switching switch receives the second closing instruction, the switch is closed, so that a connection is established between the intermediate transformer in the capacitive voltage transformer and the grounding terminal of the oil tank. In this state, parameters such as the transformation ratio error and phase error of the intermediate transformer and the working status of the entire electromagnetic unit can be measured.

[0070] Among them, the fourth measurement circuit is when the second switching switch is in the second closing state, the lightning arrester and the compensating inductor parallel circuit are grounded, thereby allowing the grounding performance of the lightning arrester to be measured to ensure that the lightning arrester can effectively protect the equipment in the event of a system failure.

[0071] It can be seen that in this embodiment, through two switching switches, multiple components in the electromagnetic unit of the capacitive voltage transformer can be measured without dismantling the equipment, saving a lot of manpower and time, and can regularly and accurately detect multiple components of the electromagnetic unit, avoiding equipment damage caused by long-term non-detection, and further ensuring the stable operation of the power system.

[0072] See also Figure 3 , Figure 33 is a schematic diagram of a measurement system provided in an embodiment of the present application. The measurement system includes one or more processors 31 and a memory 32. The memory 32 is connected to the one or more processors 31, for example, connected to the processor 31 via a bus.

[0073] The processor 31 is configured to support the measurement system to perform the corresponding functions in the method in the above method embodiment. The processor 31 can be a central processing unit (CPU), a network processor (NP), a hardware chip or any combination thereof. The above hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0074] The memory 32 is used to store program codes, etc. The memory 32 may include a volatile memory (VM), such as a random access memory (RAM); the memory 32 may also include a non-volatile memory (NVM), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory 32 may also include a combination of the above-mentioned types of memories.

[0075] The memory 32 can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the measurement method in the embodiment of the present application. The processor 31 executes the measurement method and various functional applications and data processing of the capacitor voltage transformer device with a switching switch by running the non-volatile software programs, instructions and modules stored in the memory 32, that is, realizes the measurement method provided by the above method embodiment and the functions of each module or unit of the capacitor voltage transformer device with a switching switch.

[0076] The memory 32 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function. The data storage area may store data created according to the use of the capacitor voltage transformer device with a switch, etc. In some embodiments, the memory 32 may optionally include a memory 32 remotely arranged relative to the processor 31, and these remote memories 32 may be connected to the capacitor voltage transformer device with a switch via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0077] The one or more modules are stored in the memory 32, and when executed by the one or more processors 31, the measurement method in any of the above method embodiments is executed, for example, the method steps described in the above method embodiments are executed to realize the functions of the modules described in the above device embodiments.

[0078] In one embodiment, a computer-readable storage medium is further provided. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes any step in the above method embodiment.

[0079] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0080] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A capacitor voltage transformer with a switching switch, characterized in that: It includes a capacitor unit, a lower oil tank, a switching switch controller, and an electromagnetic unit installed in the oil tank. The electromagnetic unit includes an intermediate transformer, a lightning arrester, a damping device, a first switching switch, a second switching switch and a compensating inductor. The switching switch controller is externally connected to the oil tank and controls the closed state of the first switching switch and the second switching switch.

2. The capacitor voltage transformer with a switching switch according to claim 1, characterized in that: One end of the capacitor unit is grounded, and the other end of the capacitor unit is connected in parallel with the intermediate transformer.

3. The capacitor voltage transformer with a switching switch according to claim 1, characterized in that: The first end of the primary winding of the intermediate transformer is connected to the capacitor unit, the second end of the primary winding of the intermediate transformer is connected to the first end of the compensating inductor, the secondary winding of the intermediate transformer is connected in parallel with the damping device, the second end of the compensating inductor is grounded, the lightning arrester is connected in parallel with the compensating inductor, one end of the first switching switch is connected to the first grounding terminal of the oil tank, the other end of the first switching switch is connected to the first end of the primary winding of the intermediate transformer, the first end of the second switching switch is connected to the parallel circuit between the lightning arrester and the compensating inductor, the second end of the second switching switch is connected to the first end of the lightning arrester, the third end of the second switching switch is connected to the second grounding terminal of the oil tank, and the second end of the lightning arrester is grounded.

4. The capacitor voltage transformer with a switching switch according to claim 1 or 3, characterized in that: When the capacitor voltage transformer with a switching switch is in the first mode, the switching switch controller controls the first switching switch to be in an open state, and the line between the intermediate transformer and the first grounding terminal of the oil tank is disconnected. The switching switch controller controls the second switching switch to be in a first closed state, and the second switching switch connects the lightning arrester and the parallel line between the lightning arrester and the compensating inductor, and disconnects the line of the second grounding terminal of the oil tank.

5. The capacitor voltage transformer with a switching switch according to claim 1 or 3, characterized in that: When the capacitor voltage transformer with a switching switch is in the second mode, the switching switch controller controls the first switching switch to be in a closed state, connecting the intermediate transformer and the line of the first grounding terminal of the oil tank. The switching switch controller controls the second switching switch to be in a second closed state, and the second switching switch connects the lightning arrester and the line of the second grounding terminal of the oil tank.

6. A measurement method, characterized in that: A switch controller applied to a capacitor voltage transformer with a switch, wherein the capacitor voltage transformer with a switch further comprises a first switch and a second switch, and the method comprises: Sending a control signal to the first switch and the second switch according to the operation mode of the capacitor voltage transformer with a switch; According to the control signal, controlling the closing state of the first switch and the second switch to obtain a measurement circuit; According to the measuring circuit, the capacitor voltage transformer with a switching switch is measured.

7. The method according to claim 6, characterized in that The step of sending a control signal to the first switch and the second switch according to the operation mode of the capacitor voltage transformer with a switch includes: When the capacitor voltage transformer with a switch is in the first mode, a disconnection instruction is sent to the first switch, and a first closing instruction is sent to the second switch; or, When the capacitor voltage transformer with a switching switch is in the second mode, a second closing instruction is sent to the first switching switch, and a third closing instruction is sent to the second switching switch.

8. The method according to claim 6, characterized in that When the capacitor voltage transformer with a switching switch is in the first mode, the control signal includes a disconnection instruction and a first closing instruction, and the closed state of the first switching switch and the second switching switch is controlled according to the control signal to obtain a measurement circuit, including: According to the disconnection instruction, the first switching switch is controlled to be in an open state, so as to obtain a first measurement circuit, in which the intermediate transformer in the capacitor voltage transformer with the switching switch in the first measurement circuit is disconnected from the grounding terminal of the oil tank; According to the first closing instruction, the second switching switch is controlled to be in the first closing state to obtain a second measuring circuit, in which the lightning arrester in the capacitor voltage transformer with the switching switch is connected to the compensating reactor parallel circuit and is in an ungrounded state.

9. The method according to claim 6, characterized in that When the capacitor voltage transformer with a switching switch is in the second mode, the control signal includes a second closing instruction and a third closing instruction, and the closed state of the first switching switch and the second switching switch is controlled according to the control signal to obtain a measurement circuit, including: According to the second closing instruction, the first switching switch is controlled to be in a closed state, so as to obtain a third measuring circuit, in which the intermediate transformer in the capacitor voltage transformer with the switching switch in the third measuring circuit is connected to the grounding terminal of the oil tank; According to the third closing instruction, the second switch is controlled to be in a second closing state to obtain a fourth measurement circuit, and the lightning arrester in the capacitor voltage transformer with the switch in the second measurement circuit is in a grounded state.

10. A measurement system, characterized in that: Applied to a capacitor voltage transformer with a switching switch, the capacitor voltage transformer with a switching switch performs the steps of the measurement method as described in any one of claims 6 to 9.

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