Simulated traveling wave current generating device and traveling wave distance measuring device performance verification method

Abstract

An analog traveling wave current generating device belongs to the technical field of power system testing, and solves the problem of how to design a high-precision analog traveling wave current generating device, when an electronic switch in the analog traveling wave current generating device receives a trigger signal, a switching device in the electronic switch is switched on, an energy storage capacitor in a charging circuit starts to discharge, and the electronic switch is switched on. The pulse current is generated, and the width and repetition frequency of the pulse current are adjusted by controlling the conduction time and frequency of a switching device in the electronic switch, so that a required traveling wave current signal is formed; the current wave modulation circuit filters and shapes the pulse current generated by the electronic switch according to a preset traveling wave current signal waveform parameter, and adjusts the frequency characteristic and the amplitude characteristic of the traveling wave current signal waveform; according to the invention, the functions of high-precision time delay, waveform regulation and control based on an analog electronic circuit, current generation, monitoring feedback and the like are innovatively and organically integrated in the same system, and a set of high-precision analog traveling wave current generation platform is created.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system testing, and relates to an analog traveling wave current generating device and a method for verifying the performance of a traveling wave ranging device. Background Art

[0002] A traveling wave ranging device is a device used to measure the fault location of a power line, and is mainly applied to transmission and distribution networks. Its working principle is based on the traveling wave theory, and the fault point is determined by detecting the traveling wave signal generated by the fault. The traveling wave ranging device can quickly and accurately locate the power line fault by detecting the traveling wave signal generated by the fault, improving the reliability and maintenance efficiency of the power system.

[0003] Traveling wave ranging generally includes single-end method, double-end method and multi-end method. In distribution network lines, due to the numerous branches of the distribution network lines, the double-end method is generally used. As Figure 1 shown, the principle of the double-end method traveling wave ranging is explained as follows: When a fault occurs on the line, the voltage and current transient disturbances generated at the fault point will form a traveling wave signal propagating at high speed. The traveling wave ranging devices installed at both ends of the channel can accurately locate the fault point by synchronously capturing the characteristics of the traveling wave head and using the corresponding relationship between the time difference of arrival of the double-end signals and the wave velocity of the line.

[0004] Due to the large number of manufacturers of traveling wave ranging devices and the complex technical routes, the performance of these devices varies greatly. Poor-performance traveling wave ranging devices cannot accurately judge the location of the line fault point, seriously affecting the judgment of the fault ranging performance index; and due to the lack of a reliable analog traveling wave current generating device, the research on the performance verification method of traveling wave ranging devices is still in a blank stage at present; therefore, it is urgent to study relevant inspection technologies and devices to guide the verification work of traveling wave ranging devices. Summary of the Invention

[0005] The technical solution of the present invention is used to solve the problems of designing a high-precision analog traveling wave current generating device and how to verify the performance of a traveling wave ranging device.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a simulated traveling wave current generating device, comprising: a traveling wave current signal generating circuit with multiple channels, and the traveling wave current signal generating circuit includes: a power supply module, a charging circuit, an electronic switch, a current wave-shaping circuit, and a current waveform monitoring circuit; wherein, the power supply module provides a high-voltage power supply for the entire device; the charging circuit stores the high-voltage electric energy output by the power supply module into an energy storage capacitor, providing an energy source for the generation of the traveling wave current signal of the device; when the electronic switch receives a trigger signal, the switching device in the electronic switch conducts, and the energy storage capacitor in the charging circuit starts to discharge, generating a pulse current. By controlling the conduction time and frequency of the switching device in the electronic switch, the width and repetition frequency of the pulse current are adjusted, thereby forming the required traveling wave current signal; the current wave-shaping circuit filters and shapes the pulse current generated by the electronic switch according to the preset waveform parameters of the traveling wave current signal, so as to adjust the frequency characteristics and amplitude characteristics of the traveling wave current signal waveform; the current waveform monitoring circuit is used to monitor the waveform of the generated traveling wave current signal.

[0008] Further, the power supply module includes: an AC / DC conversion module and a DC / DC boost module. The input of the AC / DC conversion module is connected to the commercial power, the output end of the AC / DC conversion module is connected to the input end of the DC / DC boost module, and the output end of the DC / DC boost module is connected to the input end of the charging circuit.

[0009] Further, the charging circuit includes: diode D 10 , resistor R 10 , resistor R 11 , resistor R 12 , resistor R 13 , switch K 12 , capacitor C 10 , capacitor C 11 , capacitor C 12 , capacitor C 13 ; the anode of diode D 10 is connected to the positive pole of the output end of the DC / DC boost module, the cathode of diode D 10 is connected to one end of resistor R 10 , and the other end of resistor R 10 is connected to the positive pole of the electronic switch; after resistor R 11 and resistor R 12 are connected in series, the non-series end of resistor R 11 is connected to the positive pole of the electronic switch, and the non-series end of resistor R 12 is connected to the negative pole of the output end of the DC / DC boost module; after resistor R 13 and switch K 12 are connected in series, the non-series end of resistor R 13 is connected to the positive pole of the electronic switch, and switch K 12The non - series end is connected to the negative pole of the output terminal of the DC / DC boost module; Capacitor C 10 and Capacitor C 11 After being connected in series, the non - series end of Capacitor C 10 is connected to the positive pole of the electronic switch, and the non - series end of Capacitor C 11 is connected to the negative pole of the output terminal of the DC / DC boost module; Capacitor C 12 and Capacitor C 13 After being connected in series, the non - series end of Capacitor C 12 is connected to the positive pole of the electronic switch, and the non - series end of Capacitor C 13 is connected to the negative pole of the output terminal of the DC / DC boost module, and the negative pole of the electronic switch is connected to the positive pole of the input terminal of the current wave - tuning circuit.

[0010] Furthermore, the current wave - tuning circuit includes: Inductor L 10 、Inductor L 11 、Inductor L 12 、Inductor L 13 、Inductor L 14 、Inductor L 15 、Double - pole switch K 13 、Double - pole switch K 14 、Double - pole switch K 15 、Resistor R 14 、Resistor R 15 、Resistor R 16 、Resistor R 17 、Resistor R 18 、Resistor R 19 ; After Inductor L 10 is connected in series with Resistor R 14 , the non - series end of Inductor L 10 is connected to the negative pole of the electronic switch, and the non - series end of Resistor R 14 is connected to the static contact of Double - pole switch K 13 , After Inductor L 11 is connected in series with Resistor R 15 , the non - series end of Inductor L 11 is connected to the negative pole of the electronic switch, and the non - series end of Resistor R 15 is connected to the static contact of Double - pole switch K 14 , After Inductor L 12 is connected in series with Resistor R 16 , the non - series end of Inductor L 12 is connected to the negative pole of the electronic switch, and the non - series end of Resistor R 16 is connected to the static contact of Double - pole switch K 15 , After Resistor R 17 is connected in series with Inductor L 13 , the non - series end of Resistor R 17 is connected to the static contact of Double - pole switch K 13is connected to the first moving contact, inductor L 13 The non - series end of is connected to the negative output terminal of the DC / DC boost module, resistor R 18 and inductor L 14 After being connected in series, the non - series end of resistor R 18 is connected to the first moving contact of the double - pole switch K 14 is connected to the first moving contact, inductor L 14 The non - series end of is connected to the negative output terminal of the DC / DC boost module, resistor R 19 and inductor L 15 After being connected in series, the non - series end of resistor R 19 is connected to the first moving contact of the double - pole switch K 15 is connected to the first moving contact, inductor L 15 The non - series end of is connected to the negative output terminal of the DC / DC boost module, double - pole switch K 13 double - pole switch K 14 and double - pole switch K 15 The second moving contact is connected, and all are connected to the positive output terminal of the traveling - wave current signal generating circuit through wires.

[0011] Furthermore, the working principle of the current wave - tuning circuit is as follows:

[0012] 1) Regulation of traveling - wave current signal in the range of 0.1A to 6A

[0013] Close the double - pole switch K 13 , and open the other double - pole switches. Adjust the charge amount of the energy - storage capacitor in the charging circuit to achieve the regulation of the current amplitude of the traveling - wave current signal in the range of 0.1 - 6A;

[0014] 2) Regulation of traveling - wave current signal in the range of 6A to 60A

[0015] Close the double - pole switch K 14 , and open the other double - pole switches. Adjust the charge amount of the energy - storage capacitor in the charging circuit to achieve the regulation of the current amplitude of the traveling - wave current signal in the range of 6 - 60A;

[0016] 3) Regulation of traveling - wave current signal in the range of 60A to 600A

[0017] Close the double - pole switch K 15 , and open the other double - pole switches. Adjust the charge amount of the energy - storage capacitor in the charging circuit to achieve the regulation of the current amplitude of the traveling - wave current signal in the range of 60 - 600A.

[0018] Furthermore, the current waveform monitoring circuit uses a resistor with R0 = 1Ω.

[0019] The present invention also provides a system for calibrating the ranging error of a traveling wave ranging device based on the above-mentioned simulated traveling wave current generating device. The output end of the first channel of the simulated traveling wave current generating device is connected to both ends of the primary side of the first integrated primary-secondary pole-mounted switch circuit breaker to form a current loop; the output end of the second channel of the simulated traveling wave current generating device is connected to both ends of the primary side of the second integrated primary-secondary pole-mounted switch circuit breaker to form another current loop; the secondary side of the first integrated primary-secondary pole-mounted switch circuit breaker is connected to the first traveling wave ranging device, and the secondary side of the second integrated primary-secondary pole-mounted switch circuit breaker is connected to the second traveling wave ranging device. Both the first traveling wave ranging device and the second traveling wave ranging device are connected to the data receiving master station, and the data receiving master station is connected to the simulated traveling wave current generating device.

[0020] Further, the calibration method of the system is as follows:

[0021] 1) Control the two channels of the simulated traveling wave current generating device to send traveling wave current signals at time t0 and time t1 respectively;

[0022] 2) After the traveling wave current signal passes through the integrated primary-secondary pole-mounted switch circuit breaker on the primary side, its induced current is captured by the traveling wave ranging device on the secondary side;

[0023] 3) The traveling wave ranging device records the wavefront time of the traveling wave current signal and sends the data to the data receiving master station;

[0024] 4) The data receiving master station sends the acquired data to the simulated traveling wave current generating device for comparison and calibration with the standard traveling wave current signal data.

[0025] Further, the calculation formula for comparing and calibrating with the standard traveling wave current signal data is as follows:

[0026] Standard time difference: Δt = t1 - t0; Test time difference: Δt' = t1' - t0'; Calibration judgment basis: |(Δt' - Δt) × Vc| ≤ W o ;

[0027] Wherein, t0' is the moment when the traveling wave current signal sent by the first channel of the simulated traveling wave current generating device at time t0 is received by the first traveling wave ranging device; t1' is the moment when the traveling wave current signal sent by the second channel of the simulated traveling wave current generating device at time t1 is received by the second traveling wave ranging device; Vc is the propagation speed of the traveling wave signal in the line; W o is the specified traveling wave ranging error threshold.

[0028] The present invention also provides a system for calibrating the synchronization error of multiple traveling wave ranging devices based on the above-mentioned simulated traveling wave current generating device. The primary sides of multiple integrated primary and secondary pole-mounted circuit breakers are connected in series, and the traveling wave current signal emitted by one of the channels of the simulated traveling wave current generating device is input to the primary sides of multiple series-connected integrated primary and secondary pole-mounted circuit breakers to form a current loop; a traveling wave ranging device is connected to the secondary side of each integrated primary and secondary pole-mounted circuit breaker.

[0029] The beneficial effects of the present invention are as follows:

[0030] The simulated traveling wave current generating device of the present invention innovatively integrates functions such as high-precision delay, waveform regulation based on analog electronic circuits, current generation, and monitoring feedback in the same system, creating a complete high-precision simulated traveling wave current generation platform; different from the common systems constructed by relying on digital signal processing and other methods, this integrated design based on analog circuits avoids problems such as quantization errors that may be brought by digital systems while achieving precise waveform regulation, improves the fineness and accuracy of waveform regulation, and overall improves the stability and test efficiency of the system; compared with traditional traveling wave current generating devices, it better meets the complex and specific test requirements of the power system. Especially when comprehensively testing equipment such as integrated primary and secondary pole-mounted circuit breakers, it can accurately simulate traveling wave currents under various actual working conditions by virtue of the advantages of analog circuit waveform regulation, providing a more practical one-stop test solution. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the principle of double-ended method traveling wave ranging;

[0032] Figure 2 It is a block diagram of the structure composition of the traveling wave current signal generating circuit;

[0033] Figure 3 It is a schematic diagram of the circuit principle of the traveling wave current signal generating circuit;

[0034] Figure 4 It is a waveform diagram of 0.1A 8 / 20us generated by the simulated traveling wave current generating device;

[0035] Figure 5 It is a waveform diagram of 6A 8 / 20us generated by the simulated traveling wave current generating device;

[0036] Figure 6 It is a waveform diagram of 60A 8 / 20us generated by the simulated traveling wave current generating device;

[0037] Figure 7 It is a waveform diagram of 600A 8 / 20us generated by the simulated traveling wave current generating device;

[0038] Figure 8 It is a physical display diagram of the internal structure of the simulated traveling wave current generating device;

[0039] Figure 9 It is a physical display diagram of the overall structure of the simulated traveling wave current generating device;

[0040] Figure 10 It is a system diagram for calibrating the ranging error of the traveling wave ranging device based on the simulated traveling wave current generating device;

[0041] Figure 11 It is a system diagram for calibrating the synchronization error of traveling wave ranging devices from multiple different manufacturers based on the simulated traveling wave current generating device. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments:

[0044] Embodiment 1

[0045] As Figure 2 shown, a simulated traveling wave current generating device provided in this embodiment includes: traveling wave current signal generating circuits with two independent channels. In this embodiment, there are two independent channels, which can also be three or more channels.

[0046] As Figure 3 shown, the traveling wave current signal generating circuit includes: a power supply module, a charging circuit, an electronic switch 12, a current wave-shaping circuit, and a current waveform monitoring circuit.

[0047] The power supply module provides high-voltage power for the entire device. The power supply module specifically includes: an AC / DC conversion module 10 and a DC / DC boost module 11. The input of the AC / DC conversion module 10 is connected to the commercial power supply, which converts the commercial power supply into a DC voltage. The output end of the AC / DC conversion module 10 is connected to the input end of the DC / DC boost module 11. The DC / DC boost module 11 is a boost circuit composed of a high-frequency transformer and a switching power supply controller, which is used to boost the DC voltage output by the AC / DC conversion module 10 to the required high-voltage value; the output end of the DC / DC boost module 11 is connected to the input end of the charging circuit.

[0048] The charging circuit stores the high-voltage electrical energy output by the power supply module in the energy storage capacitor, providing an energy source for the generation of the traveling wave current signal of the device. The charging circuit specifically includes: diode D 10 , resistor R 10 , resistor R 11 , resistor R 12 , resistor R 13 , switch K 12 , capacitor C 10 , capacitor C 11 , capacitor C 12 , capacitor C 13 ; The anode of diode D 10 is connected to the positive output terminal of the DC / DC boost module 11, and the cathode of diode D 10 is connected to one end of resistor R 10 , and the other end of resistor R 10 is connected to the positive electrode of the electronic switch 12; Resistor R 11 and resistor R 12 are connected in series, and the non-series end of resistor R 11 is connected to the positive electrode of the electronic switch 12, and the non-series end of resistor R 12 is connected to the negative output terminal of the DC / DC boost module 11; Resistor R 13 and switch K 12 are connected in series, and the non-series end of resistor R 13 is connected to the positive electrode of the electronic switch 12, and the non-series end of switch K 12 is connected to the negative output terminal of the DC / DC boost module 11; Capacitor C 10 and capacitor C 11 are connected in series, and the non-series end of capacitor C 10 is connected to the positive electrode of the electronic switch 12, and the non-series end of capacitor C 11 is connected to the negative output terminal of the DC / DC boost module 11; Capacitor C 12 and capacitor C 13 are connected in series, and the non-series end of capacitor C 12 is connected to the positive electrode of the electronic switch 12, and the non-series end of capacitor C 13 is connected to the negative output terminal of the DC / DC boost module 11.

[0049] The negative electrode of the electronic switch 12 is connected to the positive input terminal of the current modulation circuit; The electronic switch 12 can precisely control the on and off of the current to form a traveling wave current signal that meets the requirements; When the electronic switch 12 receives a trigger signal, the switching device in the electronic switch 12 quickly conducts, and the energy storage capacitor in the charging circuit starts to discharge, generating a pulsed current. By precisely controlling the conduction time and frequency of the switching device in the electronic switch 12, the width and repetition frequency of the pulsed current can be adjusted, thereby forming the required traveling wave current signal.

[0050] Preferably, the model of the electronic switch 12 is: GPP-EL-ICG-5000 / 1000.

[0051] The current wave modulation circuit includes: inductor L 10 , inductor L 11 , inductor L 12 , inductor L 13 , inductor L 14 , inductor L 15 , double-pole switch K 13 , double-pole switch K 14 , double-pole switch K 15 , resistor R 14 , resistor R 15 , resistor R 16 , resistor R 17 , resistor R 18 , resistor R 19 ; After the inductor L 10 is connected in series with the resistor R 14 , the non-series end of the inductor L 10 is connected to the negative pole of the electronic switch 12, and the non-series end of the resistor R 14 is connected to the static contact of the double-pole switch K 13 . After the inductor L 11 is connected in series with the resistor R 15 , the non-series end of the inductor L 11 is connected to the negative pole of the electronic switch 12, and the non-series end of the resistor R 15 is connected to the static contact of the double-pole switch K 14 . After the inductor L 12 is connected in series with the resistor R 16 , the non-series end of the inductor L 12 is connected to the negative pole of the electronic switch 12, and the non-series end of the resistor R 16 is connected to the static contact of the double-pole switch K 15 . After the resistor R 17 is connected in series with the inductor L 13 , the non-series end of the resistor R 17 is connected to the first moving contact of the double-pole switch K 13 . The non-series end of the inductor L 13 is connected to the negative output terminal of the DC / DC boost module 11. After the resistor R 18 is connected in series with the inductor L 14 , the non-series end of the resistor R 18 is connected to the first moving contact of the double-pole switch K 14 . The non-series end of the inductor L 14 is connected to the negative output terminal of the DC / DC boost module 11. After the resistor R 19 is connected in series with the inductor L 15 ​19 The non - series end is connected to the first moving contact of the double - pole switch K 15 The non - series end of the inductor L 15 is connected to the negative pole of the output terminal of the DC / DC boost module 11. The double - pole switch K 13 The double - pole switch K 14 The double - pole switch K 15 and the second moving contact of the double - pole switch K are all connected to the positive pole of the output terminal of the traveling - wave current signal generating circuit through wires.

[0052] Preferably, the parameter design of the current wave - tuning circuit is as follows:

[0053] The inductance value of the inductor L 10 is: 7 μH, the inductance value of the inductor L 11 is: 115 μH, the inductance value of the inductor L 12 is: 1195 μH, the inductance value of the inductor L 13 is: 5 μH, the inductance value of the inductor L 14 is: 5 μH, the inductance value of the inductor L 15 is: 5 μH, the resistance value of the resistor R 14 is: 0.33 Ω, the resistance value of the resistor R 15 is: 12.3 Ω, the resistance value of the resistor R 16 is: 132 Ω, the resistance value of the resistor R 17 is: 1 Ω, the resistance value of the resistor R 18 is: 1 Ω, the resistance value of the resistor R 19 is: 1 Ω.

[0054] The working principle of the current wave - tuning circuit:

[0055] (1) Adjustment of the traveling - wave current signal in the range of 0.1 A to 6 A

[0056] Close the double - pole switch K 13 , and the rest of the double - pole switches are open. Adjust the charge amount of the energy - storage capacitor in the charging circuit to achieve the adjustment of the current amplitude of the traveling - wave current signal in the range of 0.1 - 6 A.

[0057] (2) Adjustment of the traveling - wave current signal in the range of 6 A to 60 A

[0058] Close the double - pole switch K 14 , and the rest of the double - pole switches are open. Adjust the charge amount of the energy - storage capacitor in the charging circuit to achieve the adjustment of the current amplitude of the traveling - wave current signal in the range of 6 - 60 A.

[0059] (3) Adjustment of the traveling - wave current signal in the range of 60 A to 600 A

[0060] Close the double - pole switch K 15, the rest of the double - pole switches are disconnected, and the charge amount of the energy - storage capacitor in the charging circuit is adjusted to achieve the adjustment of the current amplitude of the traveling - wave current signal in the range of 60 - 600A.

[0061] The current wave - tuning circuit can finely adjust the current waveform to accurately match the preset traveling - wave current signal waveform, including adjusting parameters such as the amplitude, frequency, and phase of the current. According to the preset waveform parameters of the traveling - wave current signal, the filter network in the current wave - tuning circuit filters and shapes the pulse current generated by the electronic switch. By changing the parameters of components such as inductors and resistors in the filter network, the frequency characteristics and amplitude characteristics of the traveling - wave current signal waveform can be adjusted to achieve precise control of the traveling - wave current signal waveform.

[0062] Such as Figures 4 to 7 shown, are the waveform diagrams of 0.1A, 6A, 60A, 600A 8 / 20us generated by the simulated traveling - wave current generating device of this embodiment. It can be seen from the figure that the simulated traveling - wave current generating device of this embodiment can generate traveling - wave current signals from a small current of 0.1A to a large current of 600A.

[0063] 8 / 20us represents the data of the time change of the impulse current. 8 / 20us is the electromagnetic pulse induced over - voltage caused by typical lightning breaking down the ground (lightning rod or adjacent lightning - receiving object). The current curve when this induced over - voltage breaks down and burns the equipment is generally called the induced lightning waveform.

[0064] The current waveform monitoring circuit uses a resistor with R0 = 1Ω. One end of the resistor R0 is connected to the negative output terminal of the DC / DC boost module (11), and the other end of the resistor R0 serves as the negative output terminal of the traveling - wave current signal generating circuit. The current waveform monitoring circuit can monitor the waveform of the generated traveling - wave current signal in real - time and with high precision.

[0065] Such as Figure 8 And such as Figure 9 shown, are respectively the internal - structure physical - display diagram and the overall - structure physical - display diagram of the simulated traveling - wave current generating device of this embodiment.

[0066] Embodiment Two

[0067] Such as Figure 10 shown, the system for calibrating the ranging error of the traveling - wave ranging device based on the simulated traveling - wave current generating device of Embodiment One has the following structure:

[0068] The output end of the first channel of the simulated traveling wave current generating device is connected to both ends of the primary side of the first primary-secondary integrated pole-mounted switch circuit breaker to form a current loop; the output end of the second channel of the simulated traveling wave current generating device is connected to both ends of the primary side of the second primary-secondary integrated pole-mounted switch circuit breaker to form another current loop; the secondary side of the first primary-secondary integrated pole-mounted switch circuit breaker is connected to the first traveling wave ranging device, the secondary side of the second primary-secondary integrated pole-mounted switch circuit breaker is connected to the second traveling wave ranging device, both the first traveling wave ranging device and the second traveling wave ranging device are connected to the data receiving master station, and the data receiving master station is connected to the simulated traveling wave current generating device.

[0069] The specific method of calibration is as follows:

[0070] 1) Control the two channels of the simulated traveling wave current generating device to send traveling wave current signals at time t0 and time t1 respectively;

[0071] 2) After the traveling wave current signal passes through the primary-secondary integrated pole-mounted switch circuit breaker on the primary side, its induced current is captured by the traveling wave ranging device on the secondary side;

[0072] 3) The traveling wave ranging device records the wavefront time of the traveling wave current signal and sends the data to the data receiving master station;

[0073] 4) The data receiving master station sends the acquired data to the simulated traveling wave current generating device for comparison and calibration with the standard traveling wave current signal data;

[0074] The calibration is as follows:

[0075] Standard time difference: Δt = t1 - t0; Test time difference: Δt' = t1' - t0'; Calibration judgment basis: |(Δt' - Δt) × Vc| ≤ W o ;

[0076] Wherein, t0' is the moment when the traveling wave current signal sent by the first channel of the simulated traveling wave current generating device at time t0 is received by the first traveling wave ranging device; t1' is the moment when the traveling wave current signal sent by the second channel of the simulated traveling wave current generating device at time t1 is received by the second traveling wave ranging device; Vc is the propagation speed of the traveling wave signal in the line; W o is the specified traveling wave ranging error threshold.

[0077] Embodiment III

[0078] As Figure 11 shown, based on the simulated traveling wave current generating device of Embodiment I, the synchronization errors of traveling wave ranging devices from multiple different manufacturers are calibrated:

[0079] The primary sides of multiple primary-secondary integrated pole-mounted circuit breakers are connected in series. The traveling wave current signal emitted by one of the channels of the simulated traveling wave current generating device is input to the primary sides of multiple series-connected primary-secondary integrated pole-mounted circuit breakers to form a current loop; a traveling wave ranging device is connected to the secondary side of each primary-secondary integrated pole-mounted circuit breaker; in this way, it is possible to verify whether the synchronization error of traveling wave ranging devices from multiple different manufacturers meets the requirements.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A simulated traveling wave current generating device, characterized in that: include: A traveling wave current signal generating circuit for multiple channels, the traveling wave current signal generating circuit comprising: a power module, a charging circuit, an electronic switch, a current modulation circuit, and a current waveform monitoring circuit; wherein the power module provides a high-voltage power supply for the entire device; the charging circuit stores the high-voltage electric energy output by the power module in an energy storage capacitor, providing an energy source for generating a traveling wave current signal of the device; when the electronic switch receives a trigger signal, the switching device in the electronic switch is turned on, and the energy storage capacitor in the charging circuit starts to discharge, generating a pulse current, and by controlling the on-time and frequency of the switching device in the electronic switch, adjusting the width and repetition frequency of the pulse current, thereby forming the required traveling wave current signal; the current modulation circuit filters and shapes the pulse current generated by the electronic switch according to preset traveling wave current signal waveform parameters, thereby adjusting the frequency characteristics and amplitude characteristics of the traveling wave current signal waveform; the current waveform monitoring circuit is used to monitor the waveform of the generated traveling wave current signal.

2. The simulated traveling wave current generating device according to claim 1, characterized in that: The power supply module includes: an AC / DC conversion module and a DC / DC boost module. The input of the AC / DC conversion module is connected to the mains, the output of the AC / DC conversion module is connected to the input of the DC / DC boost module, and the output of the DC / DC boost module is connected to the input of the charging circuit.

3. The simulated traveling wave current generating device according to claim 2, characterized in that: The charging circuit includes: a diode D 10 , resistor R 10 , resistor R 11 , resistor R 12 , resistor R 13 , switch K 12 , capacitor C 10 , capacitor C 11 , capacitor C 12 , capacitor C 13 ; diode D 10 The anode of the diode D is connected to the positive output terminal of the DC / DC boost module. 10 The cathode and resistor R 10 One end of the resistor R 10 The other end of the resistor R is connected to the positive electrode of the electronic switch; 11 With resistor R 12 After series connection, the resistor R 11 The non-series end is connected to the positive terminal of the electronic switch, and the resistor R 12 The non-series end is connected to the negative output terminal of the DC / DC boost module; the resistor R 13 With switch K 12 After series connection, the resistor R 13 The non-series end is connected to the positive pole of the electronic switch, and the switch K 12 The non-series end of the capacitor is connected to the negative output terminal of the DC / DC boost module; 10 With capacitor C 11 After series connection, capacitor C 10 The non-series end is connected to the positive electrode of the electronic switch, and the capacitor C 11 The non-series end of the capacitor is connected to the negative output terminal of the DC / DC boost module; 12 With capacitor C 13 After series connection, capacitor C 12 The non-series end is connected to the positive electrode of the electronic switch, and the capacitor C 13 The non-series end is connected to the negative electrode of the output end of the DC / DC boost module, and the negative electrode of the electronic switch is connected to the positive electrode of the input end of the current modulation circuit.

4. The simulated traveling wave current generating device according to claim 3, characterized in that: The current modulation circuit includes: an inductor L 10 、Inductance L 11 、Inductance L 12 、Inductance L 13 、Inductance L 14 、Inductance L 15 , Double-pole switch K 13 , Double-pole switch K 14 , Double-pole switch K 15 , resistor R 14 , resistor R 15 , resistor R 16 , resistor R 17 , resistor R 18 , resistor R 19 ; Inductance L 10 With resistor R 14 After series connection, the inductor L 10 The non-series end is connected to the negative electrode of the electronic switch, and the resistor R 14 The non-series end and the double-pole switch K 13 The static contact connection, inductance L 11 With resistor R 15 After series connection, the inductor L 11 The non-series end is connected to the negative electrode of the electronic switch, and the resistor R 15 The non-series end and the double-pole switch K 14 The static contact connection, inductance L 12 With resistor R 16 After series connection, the inductor L 12 The non-series end is connected to the negative electrode of the electronic switch, and the resistor R 16 The non-series end and the double-pole switch K 15 The static contact connection, resistance R 17 With inductance L 13 After series connection, the resistor R 17 The non-series end and the double-pole switch K 13 The first moving contact is connected, the inductance L 13 The non-series end is connected to the negative output terminal of the DC / DC boost module, and the resistor R 18 With inductance L 14 After series connection, the resistor R 18 The non-series end and the double-pole switch K 14 The first moving contact is connected, the inductance L 14 The non-series end is connected to the negative output terminal of the DC / DC boost module, and the resistor R 19 With inductance L 15 After series connection, the resistor R 19 The non-series end and the double-pole switch K 15 The first moving contact is connected, the inductance L 15 The non-series end is connected to the negative output terminal of the DC / DC boost module, and the double-pole switch K 13 , Double-pole switch K 14 , and double-pole switch K 15 The second moving contact is connected to the positive pole of the output end of the traveling wave current signal generating circuit through a wire.

5. The simulated traveling wave current generating device according to claim 4, characterized in that: The working principle of the current modulation circuit is as follows: 1) Traveling wave current signal regulation in the range of 0.1A to 6A Close double-pole switch K 13 , the other double-pole switches are disconnected, and the charging amount of the energy storage capacitor in the charging circuit is adjusted to achieve the adjustment of the current amplitude of the traveling wave current signal within the range of 0.1-6A; 2) Traveling wave current signal regulation in the range of 6A to 60A Close double-pole switch K 14 , the other double-pole switches are disconnected, and the charging amount of the energy storage capacitor in the charging circuit is adjusted to achieve the adjustment of the current amplitude of the traveling wave current signal within the range of 6-60A; 3) Traveling wave current signal regulation in the range of 60A to 600A Close double-pole switch K 15 , the other double-pole switches are disconnected, and the charging amount of the energy storage capacitor in the charging circuit is adjusted to achieve the adjustment of the current amplitude of the traveling wave current signal within the range of 60-600A.

6. The simulated traveling wave current generating device according to claim 1, characterized in that: The current waveform monitoring circuit adopts a resistor of R0=1Ω.

7. A system for verifying the ranging error of a traveling wave ranging device based on the simulated traveling wave current generating device according to any one of claims 1 to 6, characterized in that: The output end of the first channel of the simulated traveling wave current generating device is connected to the two ends of the primary side of the first and second integrated pole-mounted switch circuit breaker to form a current loop; the output end of the second channel of the simulated traveling wave current generating device is connected to the two ends of the primary side of the second and second integrated pole-mounted switch circuit breaker to form another current loop; the secondary side of the first and second integrated pole-mounted switch circuit breaker is connected to the first traveling wave ranging device, and the secondary side of the second and second integrated pole-mounted switch circuit breaker is connected to the second traveling wave ranging device, the first traveling wave ranging device and the second traveling wave ranging device are both connected to the data receiving main station, and the data receiving main station is connected to the simulated traveling wave current generating device.

8. The system for verifying the ranging error of a traveling wave ranging device according to claim 7, characterized in that: The calibration method of the system is as follows: 1) Controlling two channels of the simulated traveling wave current generating device to send traveling wave current signals at time t0 and time t1 respectively; 2) After the traveling wave current signal passes through the primary-side primary-secondary fusion pole-mounted switch circuit breaker, its induced current is captured by the traveling wave ranging device on the secondary side; 3) The traveling wave ranging device records the wave crest moment of the down-going wave current signal and sends the data to the data receiving master station; 4) The data receiving master station sends the acquired data to the simulated traveling wave current generating device for comparison and verification with the standard traveling wave current signal data.

9. The system for verifying the ranging error of a traveling wave ranging device according to claim 8, characterized in that: The calculation formula for comparing and verifying with the standard traveling wave current signal data is as follows: Standard time difference: Δt = t1-t0; Test time difference: Δt' = t1'-t0'; Verification judgment basis: |(Δt'-Δt)×Vc|≤W o ; Wherein, t0' is the time when the traveling wave current signal emitted by the first channel of the simulated traveling wave current generating device at time t0 is received by the first traveling wave ranging device; t1' is the time when the traveling wave current signal emitted by the second channel of the simulated traveling wave current generating device at time t1 is received by the second traveling wave ranging device; Vc is the propagation speed of the traveling wave signal in the line; W o is the specified travelling wave ranging error threshold.

10. A system for verifying synchronization errors of multiple traveling wave distance measuring devices based on the simulated traveling wave current generating device according to any one of claims 1 to 6, characterized in that: The primary sides of multiple primary and secondary fused pole-mounted circuit breakers are connected in series, and the traveling wave current signal emitted by one channel of the simulated traveling wave current generating device is input into the primary sides of the multiple primary and secondary fused pole-mounted circuit breakers connected in series to form a current loop; the secondary side of each primary and secondary fused pole-mounted circuit breaker is connected to a traveling wave ranging device.

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