Field detection device for state of closing resistor of circuit breaker

Abstract

The utility model relates to the field detection field, and discloses a breaker closing resistance state field detection device, in the device, a voltage and current signal acquisition system is arranged in a device main body, a signal conditioner is arranged on a PCB, a high-speed synchronous sampling terminal is electrically connected with the signal conditioner, and the high-speed synchronous sampling terminal comprises a GNSS taming clock, a high-speed sampling module and an intelligent data terminal; the operation panel is arranged on the outer surface of the device main body; the electric signal input interface is arranged on the device main body and is connected with the high-speed sampling module; and the 4G antenna is arranged on the device main body and is connected with the voltage and current signal acquisition system.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker testing technology, and in particular to a field testing device for the closing resistance status of a circuit breaker. Background Technology

[0002] With the rapid development of ultra-high voltage and extra-high voltage power transmission, switchgear equipped with closing resistors, such as GIS, HGIS, and tank-type circuit breakers, is widely used. The closing resistor in a tank-type circuit breaker is used to suppress inrush current and operational overvoltage during the circuit breaker closing process. It is mainly used in AC filter fields of 800kV and above voltage level transmission lines and converter substations. The special application environment of AC filters leads to a high failure rate of the closing resistor elements. Therefore, monitoring the operating status of the closing resistor through a 750kV circuit breaker closing resistor status field detection device provides technical support for detecting the operating status of the closing resistor and has significant practical implications.

[0003] However, currently, known methods for detecting the operation of closing resistors are scarce, making real-time detection of their operational status extremely difficult. Complex working environments further complicate the monitoring process. More importantly, conventional methods require high levels of synchronization, positional accuracy, and sampling frequency for closing resistor detection, making it challenging to achieve the necessary results with typical methods. By combining protection operation data, fault recordings, and SF6 gas decomposition product detection, the faulty gas chamber was identified. The chamber was then returned to the factory for disassembly and inspection, confirming that the fault was caused by surface discharge along the insulation basin due to foreign matter inside the chamber. This method only detects circuit breaker failures caused by discharge due to foreign matter inside the chamber; it cannot detect faults caused by the closing resistor itself failing. For example, the research on reliability analysis and fault diagnosis technology of circuit breaker closing resistor proposed methods for monitoring the closing resistor status during circuit breaker operation, such as dynamic resistance fitting, acoustic and vibration signal detection, insulation performance testing, and thermal capacity testing. Finally, the feasibility of the proposed method in the process of detecting the closing resistor operating status was verified by disassembling the equipment. However, the method of detecting the closing resistor operating status by acoustic and vibration signals has certain errors and cannot accurately reflect the operating status of the closing resistor.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this utility model, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings or defects of the existing technology, a field detection device for the closing resistance status of a circuit breaker is provided, which solves the problem of cumbersome wiring caused by the excessive distance of the measurement point during field testing, while improving the measurement accuracy.

[0006] The purpose of this utility model is achieved through the following technical solutions.

[0007] A field detection device for the closing resistance status of a circuit breaker includes,

[0008] Main body of the device;

[0009] A voltage and current signal acquisition system, disposed within the main body of the device, comprising:

[0010] PCB board

[0011] The signal conditioner is mounted on the PCB board.

[0012] The high-speed synchronous sampling terminal is electrically connected to the signal conditioner. The high-speed synchronous sampling terminal includes a GNSS disciplined clock, a high-speed sampling module, and an intelligent data terminal.

[0013] An operation panel is located on the outer surface of the main body of the device;

[0014] An electrical signal input interface is located on the main body of the device and connected to the high-speed sampling module;

[0015] A 4G antenna is located on the main body of the device and connected to the voltage and current signal acquisition system.

[0016] The circuit breaker closing resistance status field detection device also includes a memory on the PCB board, which is electrically connected to a programmable gate array (FPGA).

[0017] The circuit breaker closing resistance status field detection device is equipped with an Ethernet interface.

[0018] In the aforementioned on-site detection device for the closing resistance status of the circuit breaker, an Ethernet chip connected to the Ethernet interface is also provided on the PCB board. The Ethernet chip is electrically connected to a programmable gate array (FPGA).

[0019] In the aforementioned on-site detection device for the closing resistance status of the circuit breaker, a wireless data transceiver is also provided on the PCB board, and the wireless data transceiver is electrically connected to the Ethernet chip.

[0020] The circuit breaker closing resistance status field detection device includes a housing, which is equipped with a power supply, a power switch, an interface, and indicator lights.

[0021] The circuit breaker closing resistance status field detection device also includes a power management chip connected to a power source inside the main body of the device.

[0022] In the aforementioned on-site detection device for the closing resistance status of the circuit breaker, the device is connected to both sides of the closing resistance through a current transformer and a voltage transformer probe.

[0023] The circuit breaker closing resistance status field detection device has one high-speed sampling channel and one Ethernet transmission interface on the PCB board.

[0024] The circuit breaker closing resistance status field detection device has a main body that is a sealed hollow rectangular structure.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] This utility model adopts dual-channel high-speed synchronous acquisition, with high sampling accuracy and sampling rate, and can acquire high-precision transient changes of electrical signals that cannot be acquired by general equipment; this disclosure adopts both wired and wireless network signal transmission methods, which eliminates the tedious wiring process that is unavoidable when the measurement point is too far away during on-site measurement, and has the advantages of being drop-resistant, impact-resistant, stable and easy to place.

[0027] The description is merely an overview of the technical solution of this utility model. In order to make the technical means of this utility model clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and in order to make the described and other objects, features and advantages of this utility model more obvious and easy to understand, specific embodiments of this utility model are illustrated below. Attached Figure Description

[0028] Various other advantages and benefits of this invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention. Obviously, the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0029] In the attached diagram:

[0030] Figure 1 This is a front view of a field detection device for the closing resistance status of a 750kV circuit breaker provided in one embodiment of this disclosure;

[0031] Figure 2 This is a test wiring diagram of a 750kV circuit breaker closing resistance status detection system provided in one embodiment of the present disclosure;

[0032] Figure 3This is a schematic diagram of the simulation results of a field detection device for the closing resistance status of a 750kV circuit breaker provided in an embodiment of this disclosure under an impulse current amplitude of 900A.

[0033] Figure 4 This is a schematic diagram of the simulation results of a field detection device for the closing resistance status of a 750kV circuit breaker provided in an embodiment of this disclosure under an impulse current amplitude of 1500A.

[0034] Figure 5 This is a schematic diagram of the simulation results of a field detection device for the closing resistance status of a 750kV circuit breaker provided in an embodiment of this disclosure under an impulse current amplitude of 2100A.

[0035] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0036] Specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0037] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions of the preferred embodiments of the present invention are for the purpose of implementing the general principles of the specification and are not intended to limit the scope of the present invention. The scope of protection of this invention shall be determined by the appended claims.

[0038] To facilitate understanding of the embodiments of this utility model, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of this utility model.

[0039] To better understand, such as Figures 1 to 5 As shown, a field detection device for the closing resistance status of a circuit breaker includes,

[0040] Main body of the device;

[0041] A voltage and current signal acquisition system, disposed within the main body of the device, comprising:

[0042] PCB board

[0043] The signal conditioner is mounted on the PCB board.

[0044] The high-speed synchronous sampling terminal is electrically connected to the signal conditioner. The high-speed synchronous sampling terminal includes a GNSS disciplined clock, a high-speed sampling module, and an intelligent data terminal.

[0045] The operation panel 2 is located on the outer surface of the main body of the device;

[0046] Electrical signal input interface 4 is located on the main body of the device and connected to the high-speed sampling module;

[0047] A 4G antenna 10 is located on the main body of the device and connected to the voltage and current signal acquisition system.

[0048] In a preferred embodiment of the circuit breaker closing resistance status field detection device, a memory is also provided on the PCB board, and the memory is electrically connected to a programmable gate array (FPGA). The FPGA is mounted on the PCB board. When the potential signal of the target under test reaches the trigger threshold of the detection device, the signal conditioner immediately begins to condition the potential signal. The FPGA then integrates and processes the conditioned potential signal, buffers it, and finally transmits the processed potential waveform data to a computer operating platform for further visualization processing via an Ethernet LAN or 4G network.

[0049] In a preferred embodiment of the circuit breaker closing resistance status field detection device, the main body of the device is provided with an Ethernet interface 3.

[0050] In a preferred embodiment of the circuit breaker closing resistance status field detection device, an Ethernet chip connected to the Ethernet interface 3 is also provided on the PCB board, and the Ethernet chip is electrically connected to the programmable gate array (FPGA).

[0051] In a preferred embodiment of the circuit breaker closing resistance status field detection device, a wireless data transceiver is also provided on the PCB board, and the wireless data transceiver is electrically connected to the Ethernet chip.

[0052] In a preferred embodiment of the circuit breaker closing resistance status field detection device, the main body of the device includes a housing, and the housing is provided with a power supply, a power switch 7, an interface, and an indicator light.

[0053] In a preferred embodiment of the circuit breaker closing resistance status field detection device, a power management chip connected to a power supply is also provided inside the main body of the device.

[0054] In a preferred embodiment of the circuit breaker closing resistance status field detection device, the circuit breaker closing resistance status field detection device is connected to both sides of the closing resistance through a current transformer and a voltage transformer probe.

[0055] In a preferred embodiment of the circuit breaker closing resistance status field detection device, the PCB board interface has one high-speed sampling channel and one Ethernet transmission interface.

[0056] In a preferred embodiment of the circuit breaker closing resistance status field detection device, the main body of the device is a sealed hollow rectangular structure.

[0057] In one embodiment, the housing includes a housing 1 and a top cover, which are assembled by round-head screws 8. The housing 1 is lined with foam paper, and the gap between the housing 1 and the top cover is filled with sponge.

[0058] In one embodiment, the housing is provided with a power indicator light 5 and a clock trigger indicator light 6.

[0059] In one embodiment, the housing is provided with a heat dissipation vent 9.

[0060] In one embodiment, the intelligent data terminal includes a data acquisition module, a core data processing unit, and a communication module.

[0061] This disclosure provides a test wiring diagram for a 750kV circuit breaker closing resistor status detection system according to one embodiment. The system comprises two main units, each housing a voltage and current signal acquisition system. This system includes a PCB board with a signal conditioner electrically connected to a GS-XH-4G high-speed synchronous sampling terminal. The GS-XH-4G high-speed synchronous sampling terminal consists of a GNSS disciplined clock, a high-speed sampling module, and an intelligent data terminal. Its conventional hardware interfaces include one high-speed sampling channel and one Ethernet transmission interface. The two main units are connected to both sides of the closing resistor via current transformers and voltage transformer probes, ensuring good contact. The two units record the voltage across the closing resistor and the current flowing through it. Based on the measured voltage and current data, and combined with the closing resistor's operation and maintenance indicators, the operating status of the closing resistor is evaluated to achieve the detection of its operating status. The operating status of the closing resistor is obtained by detecting the fluctuation amplitude, magnitude, and duration of the voltage and current fluctuations.

[0062] Specific operational procedures for implementing 750kV circuit breaker closing resistance status detection loading:

[0063] (1) Equipment connection and installation

[0064] Connect the detection probes of the 750kV circuit breaker closing resistance status detection system to both sides of the closing resistor, ensuring good contact. The test conditions are as follows: use a 1000:1 high-voltage probe for the voltage transformer, a standard 1:1 probe for the current transformer, and a 100A:1V Rogowski coil. The detection probes should have high impedance characteristics to minimize their impact on the circuit under test.

[0065] (2) Equipment commissioning

[0066] Turn on the power to the 750kV circuit breaker closing resistance status detection system and allow it to warm up for a period of time (e.g., 5 minutes) to ensure the stability of the measurement results. Set the range and sensitivity of the detection device according to system requirements, ensuring it can cover the required potential range. Calibrate the equipment using a calibration signal to ensure the accuracy of the measurement data.

[0067] (3) Real-time monitoring

[0068] After the equipment installation and commissioning are completed, real-time monitoring of the AC potential on both sides of the closing resistor begins. The 750kV circuit breaker closing resistor status detection system should have waveform display functionality, capable of displaying the voltage waveform at the measured point in real time to observe voltage and current change characteristics. Data recording is initiated, and voltage data is saved for subsequent analysis.

[0069] (4) Data Analysis

[0070] Based on the measured potential data, analyze the changes in potential across the closing resistor. The following aspects typically need to be considered:

[0071] Voltage and current fluctuations: Check for abnormal voltage fluctuations. Voltage and current waveform fluctuations: ≤2% indicate that the closing resistor is operating normally. Voltage and current waveform fluctuations of 2% to 5% indicate that the closing resistor may have minor hidden dangers. Voltage and current waveform fluctuations of ≥5% indicate that the closing resistor may fail and require targeted inspection.

[0072] Amplitude variation: Observe whether the voltage and current amplitudes are within the normal range. Excessively high or low voltages may affect system stability.

[0073] Voltage-current ratio relationship: Observe whether there are fluctuations in the voltage-current ratio, and reflect whether there are any damaged points between the closing resistors.

[0074] Based on the test requirements for circuit breakers in the national standard GB1984-2014, and combined with the above experimental principles, a simulation was performed. The simulation waveform results are as follows: Figure 3 , Figure 4 and Figure 5As shown. At this time, the test conditions are as follows: the voltage probe uses a 1000:1 high-voltage probe, the current probe uses a conventional probe with a 1:1 ratio, the coil uses a 100A:1V Rogowski coil, the blue curve is the voltage signal waveform, and the red curve is the current signal waveform. Figure 3 The voltage amplitude across the closing resistor is 5.4 × 10⁻⁶. 3 kV, the current amplitude flowing through the closing resistor is 898A; Figure 4 The voltage amplitude across the closing resistor is 8.7 × 10⁻⁶. 3 kV, the current amplitude flowing through the closing resistor is 1.42×10 3 kA, Figure 5 The voltage amplitude across the closing resistor is 1.14 × 10⁻⁶. 4 kV, the current amplitude flowing through the closing resistor is 2.03×10 3 kA.

[0075] This utility model's voltage and current signal acquisition system integrates a signal conditioner and a high-speed synchronous sampling terminal (including a GNSS disciplined clock, a high-speed sampling module, and an intelligent data terminal) on a PCB board. High-precision synchronous acquisition: The GNSS disciplined clock achieves microsecond-level time synchronization (error ≤ 1μs), ensuring the synchronicity of sampling from both devices and meeting the stringent phase consistency requirements of the 750kV high-voltage system. Wideband signal processing: The signal conditioner supports a bandwidth of 0–10MHz, suppresses high-frequency noise (signal-to-noise ratio ≥ 60dB), and adapts to transient currents in the closing resistor (e.g., 1.42 × 10⁻⁶). 3 kA) and steep wave voltage (e.g., 1.14 × 10 ... 4 Accurate acquisition of kV signals. Intelligent data integration: The FPGA integrates the conditioned signal in real time (sampling rate ≥ 1MS / s) and caches it in memory (capacity ≥ 128GB) to reduce the risk of data loss (packet loss rate ≤ 0.01%). The high-speed synchronous sampling terminal consists of a GNSS disciplined clock + high-speed sampling module + intelligent data terminal. Time reference unification: The GNSS disciplined clock (synchronization accuracy ±50ns) solves the clock drift problem during multi-device collaborative sampling, ensuring phase alignment of voltage / current waveforms. Figures 3 to 5(Synchronization of red and blue curves). Transient signal capture: A high-speed sampling module (16-bit resolution) accurately captures microsecond-level transient waveforms (e.g., voltage drop time ≤ 5μs) during the closing resistor operation, supporting fault feature analysis. Edge computing capability: The intelligent data terminal has built-in algorithms (e.g., FFT, wavelet transform) to analyze the voltage-to-current ratio and volatility (≤2% is normal) in real time, directly outputting status assessment results (normal / potential / failure). Multi-mode transmission: Ethernet (bandwidth ≥ 100Mbps) ensures high-speed data transmission in the laboratory environment, while 4G network (supports Cat.6) enables remote on-site monitoring (latency ≤ 100ms), adapting to the complex electromagnetic environment of substations. Data redundancy backup: Parallel transmission via wireless transceiver and wired interface ensures data integrity under extreme conditions (e.g., strong interference) (bit error rate ≤ 10%). -6 Features include a sealed, hollow rectangular shell, sponge-filled gaps, heat dissipation vents, and a power management chip. Electromagnetic shielding: a metal shell (shielding effectiveness ≥60dB) suppresses external electromagnetic interference (such as transient fields generated by GIS equipment switching operations), ensuring sampling accuracy (error ≤0.5%). Environmental adaptability: sponge filling (IP67 protection rating) provides dust and moisture protection, and a heat dissipation duct design (temperature rise ≤15℃) ensures long-term operational stability in high-temperature environments (-40℃~+70℃). Power optimization: a power management chip (conversion efficiency ≥90%) supports wide voltage input (100~240V AC), and a built-in lithium battery (endurance ≥8h) meets the needs of on-site testing without external power. It includes a high-impedance voltage probe (1000:1), a Rogowski current coil (100A:1V), and one high-speed sampling channel. Non-invasive measurement: the voltage probe input impedance is ≥10MΩ, and the current probe is non-inductively coupled, avoiding impact on the 750kV main circuit load characteristics (additional impedance ≤0.1Ω). Wide dynamic range: voltage range 0~20kV (attenuated by probe), current range 0~2kA, covering all operating conditions of the closing resistance (including fault-condition overcurrent 2.03×10). 3 (kA). High-precision synchronous sampling: GNSS disciplined clock + FPGA integration solves the problem of multi-terminal signal synchronization in high-voltage systems, with a phase error ≤0.1°. Anti-interference and reliability: Electromagnetic shielding + signal conditioning + redundant communication ensure data reliability (confidence ≥99.9%) in complex electromagnetic environments. Wide-range power supply + portable design + IP67 protection meet the harsh environmental testing needs of 750kV substations, reducing operation and maintenance costs by 30%–50%.

[0076] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0077] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary 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 field detection device for the closing resistance status of a circuit breaker, characterized in that, It includes, Main body of the device; A voltage and current signal acquisition system, disposed within the main body of the device, comprising: PCB board The signal conditioner is mounted on the PCB board. The high-speed synchronous sampling terminal is electrically connected to the signal conditioner. The high-speed synchronous sampling terminal includes a GNSS disciplined clock, a high-speed sampling module, and an intelligent data terminal. An operation panel is located on the outer surface of the main body of the device; An electrical signal input interface is located on the main body of the device and connected to the high-speed sampling module; A 4G antenna is located on the main body of the device and connected to the voltage and current signal acquisition system.

2. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The PCB board also has a memory, which is electrically connected to a programmable gate array (FPGA).

3. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The main body of the device is equipped with an Ethernet interface.

4. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 3, characterized in that, The PCB board is also equipped with an Ethernet chip that connects to the Ethernet interface, and the Ethernet chip is electrically connected to a programmable gate array (FPGA).

5. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 4, characterized in that, A wireless data transceiver is also provided on the PCB board, and the wireless data transceiver is electrically connected to the Ethernet chip.

6. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The main body of the device includes a housing, which is equipped with a power supply, a power switch, an interface, and indicator lights.

7. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The device also contains a power management chip that is connected to a power source.

8. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The on-site detection device for the closing resistance status of the circuit breaker is connected to both sides of the closing resistance through current transformer and voltage transformer probes.

9. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The PCB board has one high-speed sampling channel and one Ethernet transmission interface.

10. The on-site detection device for the closing resistance status of a circuit breaker as described in claim 1, characterized in that, The main body of the device is a sealed hollow rectangular structure.

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