10kV overhead line traveling wave distance measuring device

Abstract

The invention discloses a traveling wave distance measuring device for a 10KV overhead line. The traveling wave distance measuring device comprises a 10KV deep fusion circuit breaker system, an integrated electricity-taking power supply module, a traveling wave module and a feeder terminal unit (FTU), the 10KV deep fusion circuit breaking system supplies power to the traveling wave module through the integrated electricity-taking power supply module, and the traveling wave module performs signal transmission with the feeder terminal unit FTU through 433M wireless communication. The traveling wave module is composed of three electric signal collection circuits, a signal processing circuit and a communication transmission circuit, a high-frequency current coil in the electric signal collection circuit is connected with single-phase electricity in 10KV three-phase electricity to collect traveling wave electric signals, and the collected electric signals are transmitted to a characteristic signal collection circuit to convert voltage collection values; and the signal conditioning circuit acquires the voltage at the output end of the characteristic signal acquisition circuit, amplifies the voltage and transmits the amplified voltage to the signal processing circuit. According to the scheme, the sampling effect under the condition of small signals is remarkably improved through the integrated design of the system and the optimization of the dual-channel signal conditioning circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of traveling wave distance measuring device, and particularly relates to a 10KV overhead line traveling wave distance measuring device. BACKGROUND

[0002] At present, the traveling wave fault location device in the distribution network usually adopts a distributed architecture, that is, the traveling wave high-frequency sensor is installed on the primary line, the sampling characteristic signal obtained by the high-frequency sensor is introduced to the traveling wave acquisition module installed in the feeder terminal FTU through a dedicated long cable (usually 8-15 meters) for secondary sampling processing, the traveling wave acquisition module interacts with the FTU through a network, a serial port and the like, and finally the information is uploaded to the master station by the feeder terminal FTU.

[0003] The traditional architecture has the following inherent defects: 1. The amplitude range of the traveling wave high-frequency signal is extensive, and the identification accuracy of small signals below 5A is low: (1) Separation of acquisition and processing, and serious signal quality degradation: Noise and interference: The signal collected by the high-frequency sensor is transmitted to the feeder terminal FTU for processing through a long cable. The long-distance signal cable is equivalent to a huge antenna, which is easily coupled with space electromagnetic interference. At the same time, the shielding process and grounding mode of the cable itself can introduce ground loop noise, which has a huge impact on small traveling wave current signals (especially small current faults), resulting in a sharp decrease in signal-to-noise ratio.

[0004] Signal attenuation and distortion: The long cable can introduce distributed capacitance and inductance, which can cause serious attenuation and waveform distortion of the high-frequency traveling wave signal, affecting the accuracy of subsequent wave head identification.

[0005] (2) Small signal precision problem: The existing circuit uses a fixed gain method to process the full range of traveling wave high-frequency characteristic signals, which cannot accommodate small signals and large signals, and often has to sacrifice fault processing under small signal conditions. Generally, high-frequency characteristic signals below 10A cannot meet the precision requirements.

[0006] 2. System complexity and high cost: Compared with the traditional circuit breaker, a dedicated shielding cable needs to be laid, which increases the construction difficulty, material cost and post-maintenance workload, and also reduces the reliability of the system. Long-term operation may cause a decrease in the waterproof level of the cable and other risks.

[0007] The existing system power supply uses an external PT for power supply, which has a complex structure and high cost.

[0008] 3. Low matching of circuit breaker and FTU: In the factory installation link, since the collection and processing of the traveling wave characteristic signal are separated, the circuit breaker needs to be matched and calibrated with the matching feeder terminal FTU, and it is difficult to realize the adaptive matching of the circuit breaker and the feeder terminal FTU. SUMMARY

[0009] The 10KV overhead line traveling wave distance measurement device and system provided by the application can solve the technical problems in the background art.

[0010] To achieve the above-mentioned purposes, the application adopts the following technical solutions: A 10KV overhead line traveling wave distance measurement device, comprising: a 10KV deep fusion circuit breaker system, an integrated power supply module, a traveling wave module, and a feeder terminal FTU. The 10KV deep fusion circuit breaker system supplies power to the traveling wave module through the integrated power supply module, and the traveling wave module transmits signals with the feeder terminal FTU through 433M wireless communication.

[0011] Further, the traveling wave module comprises three electric signal collection circuits, a signal processing circuit, and a communication transmission circuit. The three electric signal collection circuits are connected to the signal processing circuit, and the signal processing circuit transmits the processed electric signals to the communication transmission circuit. The electric signal collection circuit comprises a high-frequency current coil, a characteristic signal collection circuit, and a signal conditioning circuit. The high-frequency current coil collects electric signals from single-phase electricity in 10KV three-phase electricity, transmits the collected electric signals to the characteristic signal collection circuit to convert the voltage collection value, and transmits the voltage collection from the output end of the characteristic signal collection circuit to the signal processing circuit through the signal conditioning circuit.

[0012] Further, the high-frequency current coil of the application is selected from an ultra-microcrystalline iron core current coil, which does not limit or does not open an air gap.

[0013] Further, the signal conditioning circuit of the application comprises 4 times gain circuit and 8 times gain circuit connected in parallel. The circuit structures of the 4 times gain circuit and the 8 times gain circuit are the same, and the structure is as follows: a capacitor C6 connected with the characteristic signal collection circuit, the other end of the capacitor C6 connected with a capacitor C7, and the other end of the capacitor C7 connected with the non-inverting input end of an operational amplifier U2A. The inverting power supply input end of the operational amplifier U2A is connected with a capacitor C8, and the other end of the capacitor C8 is grounded. The non-inverting power supply input end of the operational amplifier U2A is connected with a capacitor C4, and the other end of the capacitor C4 is grounded. The inverting input end of the operational amplifier U2A is connected with the capacitor C2, the resistor R4 and the resistor R3, the other end of the resistor R4 is grounded, the capacitor C2 and the resistor R4 are connected in parallel with each other, and the other end is connected with the output end of the operational amplifier U2A; The output end of the operational amplifier U2A is connected with the resistor R5, the other end of the resistor R5 is connected with the capacitor C9 and the non-inverting input end of the operational amplifier U1A, and the other end of the capacitor C9 is grounded;

[0014] The output end of the operational amplifier U2A is connected with the resistor R5, the other end of the resistor R5 is connected with the capacitor C9 and the non-inverting input end of the operational amplifier U1A, and the other end of the capacitor C9 is grounded; The inverting power supply input end of the operational amplifier U1A is connected with the capacitor C5, and the other end of the capacitor C5 is grounded; The non-inverting power supply input end of the operational amplifier U1A is connected with the capacitor C3, and the other end of the capacitor C3 is grounded; The inverting input end of the operational amplifier U1A is connected with the capacitor C1, the resistor R2 and the resistor R1, the other end of the resistor R2 is grounded, the capacitor C1 and the resistor R2 are connected in parallel with each other, the other end is connected with the output end of the operational amplifier U1A, and the output end ADCv1 of the signal conditioning circuit is obtained.

[0015] Further, the integrated power supply module structure comprises: a protection circuit, a step-down voltage stabilizing circuit, an LDO low-noise device and an energy storage capacitor management. The output end of the protection circuit is connected with the input end of the step-down voltage stabilizing circuit, the output end of the step-down voltage stabilizing circuit is connected with the LDO low-noise device, and the LDO low-noise device is connected with the energy storage capacitor management. The protection circuit structure is as follows: one end of the pressure sensitive resistor RV1 is grounded, the other end is connected with the pressure sensitive resistor RV2 and the adjustable resistor F1, the other end of the pressure sensitive resistor RV2 is connected with the pressure sensitive resistor RV3, and the other end of the pressure sensitive resistor RV3 is grounded. The other end of the adjustable resistor F1 is connected with the capacitor CY1, the capacitor CX1 and the input end VIN of the chip U2, the other end of the capacitor CX1 is connected with the capacitor CY2, the other end of the capacitor CY2 is grounded, and the other end of the capacitor CY1 is grounded. The enable end of the chip U2 is connected with the resistor R14 and the resistor R16, the resistor R14 is connected with the capacitor C6 and the input end VIN of the chip U2, the resistor R16 is connected with the capacitor C6 and the resistor R17, and the other end of the resistor R17 is connected with the clock input end RT / SYNC of the chip U2. The BOOT end of the chip U2 is connected with the capacitor C1, the other end of the capacitor C1 is connected with the inductor L1, the negative electrode of the diode D2 and the SW end of the chip U2, the positive electrode of the diode D2 is grounded, the capacitor C4 and the resistor R13, the other end of the capacitor C4 is connected with the SS end of the chip U2, the other end of the resistor R13 is connected with the resistor R8, the other end of the resistor R8 is connected with the inductor L1, and the inductor L1 is connected with the step-down voltage stabilizing circuit.

[0016] From the above technical solutions can be known, the 10KV overhead line traveling wave distance measuring device of the application is integrated and designed, and the optimization of the double-channel signal conditioning circuit, so that the sampling effect under the condition of small signal is significantly improved; the traveling wave module and the feeder terminal FTU are powered by the capacitor power supply mode, the power supply module can be fixed in the pole column, the structure is simple, and the performance is reliable; the feeder terminal FTU and the traveling wave module are powered separately, and the interference is isolated; the current coil with super microcrystalline iron core is selected as the high-frequency current coil, so that the signal conditioning circuit only needs to be filtered and amplified, and does not need to be integrated. The high-fidelity acquisition, conditioning, processing and information transmission of A, B and C three-phase traveling wave characteristic signals are directly completed in the circuit breaker; the original traveling wave characteristic signal transmission cable is cancelled, and the low-noise and non-attenuation signal transmission is ensured. The signal transmission between the traveling wave module and the feeder terminal FTU can be realized through the 433M wireless communication mode, and the stable and reliable communication can be realized without adding additional cable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural block diagram of the 10KV overhead line traveling wave distance measuring device of the application; Figure 2 It is a circuit block diagram of the traveling wave module of the application; Figure 3 It is a circuit block diagram of the double-channel signal conditioning and signal processing circuit of the application; Figure 4 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 5 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 6 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 7 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 8 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 9 It is a schematic diagram of the traveling wave distance measuring processing flow of the application; Figure 10 It is a schematic diagram of the traveling wave distance measuring processing flow of the application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application.

[0019] AsFigure 1 As shown, the 10KV overhead line traveling wave distance measuring device described in the embodiment comprises a 10KV deep fusion circuit breaker system, an integrated power supply module, a traveling wave module, and a feeder terminal FTU. The 10KV deep fusion circuit breaker system supplies power to the traveling wave module through the integrated power supply module, and the traveling wave module transmits signals to the feeder terminal FTU through 433M wireless communication.

[0020] As shown Figure 2 The traveling wave module is integrated in the 10KV deep fusion circuit breaker and comprises a three-way electrical signal collection circuit, a signal processing circuit, and a communication transmission circuit. The three-way electrical signal collection circuit is connected to the signal processing circuit, and the signal processing circuit transmits the processed electrical signals to the communication transmission circuit. The electrical signal collection circuit comprises a high-frequency current coil, a characteristic signal acquisition circuit, and a signal conditioning circuit. The high-frequency current coil collects electrical signals from single-phase electricity in 10KV three-phase electricity, transmits the collected electrical signals to the characteristic signal acquisition circuit for voltage conversion, and transmits the voltage acquisition from the output end of the characteristic signal acquisition circuit to the signal processing circuit after amplification by the signal conditioning circuit.

[0021] Among them, the high-frequency current coil uses a super-microcrystalline iron core, so that the subsequent electrical signal processing circuit only needs to perform filtering and amplification, without the need for integral conversion. The characteristic signal acquisition circuit uses a board-mounted current transformer with a transformation ratio of 10A:3.53V, corresponding to a conversion relationship of 0.83mA converted to an output of 0.293mV, 83.33mA converted to an output of 29.3mV, and 833.33mA converted to an output of 293mV. The converted voltage acquisition value is processed and amplified by the signal conditioning circuit and then processed by AD.

[0022] As shown Figure 3 The signal conditioning circuit comprises a 4x gain circuit and an 8x gain circuit connected in parallel. Among them, the gain circuit comprises a high-precision, low-temperature drift resistor and an operational amplifier circuit connected in sequence. The specific conditioning circuit structure is as follows: As shown Figure 4 The signal conditioning circuit comprises a 4x gain circuit and an 8x gain circuit with the same circuit structure. The 4x gain circuit comprises a capacitor C6 connected to the characteristic signal acquisition circuit, the other end of the capacitor C6 connected to a capacitor C7, and the other end of the capacitor C7 connected to the non-inverting input terminal of an operational amplifier U2A. The inverting power input terminal of the operational amplifier U2A is connected to a capacitor C8, and the other end of the capacitor C8 is grounded. The positive power input terminal of operational amplifier U2A is connected to capacitor C4, and the other end of capacitor C4 is grounded. The inverting input terminal of operational amplifier U2A is connected to capacitor C2, resistor R4, and resistor R3. The other end of resistor R4 is grounded. Capacitor C2 and resistor R4 are connected in parallel, and the other end is connected to the output terminal of operational amplifier U2A. It also includes a resistor R7 with one end connected to the output of operational amplifier U2A and the other end connected to the junction of capacitors C6 and C7.

[0023] The output terminal of operational amplifier U2A is connected to resistor R5. The other end of resistor R5 is connected to capacitor C9 and the non-inverting input terminal of operational amplifier U1A. The other end of capacitor C9 is grounded. The reverse power supply input terminal of operational amplifier U1A is connected to capacitor C5, and the other end of capacitor C5 is grounded. The positive power input terminal of operational amplifier U1A is connected to capacitor C3, and the other end of capacitor C3 is grounded. The inverting input of operational amplifier U1A is connected to capacitor C1, resistor R2, and resistor R1. The other end of resistor R2 is grounded. Capacitor C1 and resistor R2 are connected in parallel, and the other end is connected to the output of operational amplifier U1A, serving as the output of signal conditioning circuit ADCv1.

[0024] Similarly, the output of operational amplifier U3A serves as the output of signal conditioning circuit ADCv2. like Figure 5 As shown, the signal conditioning circuit adjusts the amplification factor according to the level of the signal input. The specific logic is as follows: The traveling wave amplitude range is 0.1A ~ 100A. The existing high-frequency current coil has a turns ratio of 600A:5A. 0.1A is converted to 0.83mA at the output, 10A is converted to 83.33mA at the output, and 100A is converted to 833.33mA at the output.

[0025] The onboard current transformer used in the characteristic signal acquisition module has a ratio of 10A:3.53V, corresponding to the following conversion relationships: 0.83mA is converted to 0.293mV at the output, 83.33mA to 29.3mV at the output, and 833.33mA to 293mV at the output. The converted voltage acquisition values ​​are processed and amplified by the signal conditioning circuit before being sent to the AD converter for further processing.

[0026] Amplifying the entire signal using a single magnification factor across the entire range presents the following problems: it cannot simultaneously satisfy the conflicting requirements of unsaturated (overflow) large signals and undistorted (accurate) small signals. Especially for small signals, insufficient resolution and deteriorated signal-to-noise ratio (SNR) can occur, leading to distortion or loss of the traveling wavefront, ultimately resulting in the system's inability to effectively detect and identify small current faults or traveling wavefronts.

[0027] On the basis of high-resolution ADC oversampling technology, a double-channel parallel acquisition structure is adopted. One way of the traveling wave current signal is sent to the first ADC channel through the low-gain amplifier, and the other way is sent to the second ADC channel through the high-gain amplifier; the processor is configured to: compare the data of the two channels in real time, and select the channel data without distortion for the traveling wave head extraction and fault judgment based on the criterion whether the low-gain channel is saturated, so as to realize the full-range accurate measurement from 0.1A to 100A.

[0028] The data processing logic is as follows: the double-channel simultaneously amplifies and samples the input signal, and the back-end processor monitors the double-channel data in real time. Below 10A, 8 times of amplification gain is adopted, and above 10A, 4 times of amplification gain is adopted. Specifically, the large and small values of AD sampling are compared: when the small value of AD sampling exceeds 234.4mV, it is considered that the amplitude of the traveling wave characteristic signal exceeds 20A, at this time, the small value amplified by 4 times is used by default; when the small value of AD sampling does not exceed 234.4mV, it is considered that the amplitude of the traveling wave characteristic signal is less than 20A, at this time, the large value amplified by 8 times is used by default.

[0029] In summary, the signal conditioning circuit can adaptively switch according to the size of the input characteristic signal. It can meet the high-precision sampling of 5A high-frequency traveling wave characteristic signal, and can guarantee the identification and processing of the traveling wave characteristic signal in the full range of 1A~120A.

[0030] As shown in Figure 6 , the working process of traveling wave sampling and processing is as follows: FTU is responsible for sampling A, B and C three-phase power frequency quantities (including alternating voltage and alternating current), and preliminarily determines the fault type; the traveling wave module samples A, B and C three-phase high-frequency characteristic signals (current) through the high-frequency current coil, and performs traveling wave high-frequency characteristic signal recording and collection; after the FTU determines, it communicates with the traveling wave module through the serial port and the like, selects the time range of the traveling wave according to the fault time sent by the FTU, and performs wave head information extraction and determination, and returns the information to the FTU after success, and performs main station information uploading.

[0031] The signal processing circuit includes AD and MCU, the AD receives the electrical signal output from the signal conditioning circuit to identify and process the traveling wave characteristic signal, and transmits the processed electrical signal to the MCU minimum system.

[0032] As shown in Figure 7 , power is taken from the 10KV overhead line A phase power supply side and the C phase load side, the power supply system of the traveling wave distance measurement device includes a capacitor power taking module which can directly power the feeder terminal FTU, and the integrated power supply module powers the traveling wave module separately; Among them, as shown in Figure 8As shown, the integrated power supply module structure includes: protection circuit, voltage reduction type voltage stabilizing circuit, LDO low noise device, energy storage capacitor management. The output end of the protection circuit is connected to the input end of the voltage reduction type voltage stabilizing circuit, the output end of the voltage reduction type voltage stabilizing circuit is connected to the LDO low noise device, and the LDO low noise device is simultaneously connected to the energy storage capacitor management. The circuit structure is as shown in Figure 9 、 10 As shown, the specific implementation is as follows: One end of the voltage-dependent resistor RV1 is grounded, the other end is connected to the voltage-dependent resistor RV2 and the adjustable resistor F1, the other end of the voltage-dependent resistor RV2 is connected to the voltage-dependent resistor RV3, and the other end of the voltage-dependent resistor RV3 is grounded. The other end of the adjustable resistor F1 is connected to the capacitor CY1, the capacitor CX1 and the input end VIN of the chip U2, the other end of the capacitor CX1 is connected to the capacitor CY2, the other end of the capacitor CY2 is grounded, and the other end of the capacitor CY1 is grounded. The enable end of the chip U2 is connected to the resistor R14 and the resistor R16, the resistor R14 is connected to the capacitor C6 and the input end VIN of the chip U2, the resistor R16 is connected to the capacitor C6 and the resistor R17, the other end of the resistor R17 is connected to the clock input end RT / SYNC of the chip U2. The BOOT end of the chip U2 is connected to the capacitor C1, the other end of the capacitor C1 is connected to the inductor L1, the negative electrode of the diode D2 and the SW end of the chip U2, the positive electrode of the diode D2 is grounded, the capacitor C4 and the resistor R13, the other end of the capacitor C4 is connected to the SS end of the chip U2, the other end of the resistor R13 is connected to the resistor R8, the other end of the resistor R8 is connected to the inductor L1, and the inductor L1 is connected to the voltage reduction type voltage stabilizing circuit.

[0033] The capacitor power supply module outputs a voltage of about DC 30V to provide power supply for the feeder terminal FTU and the traveling wave module. The power supply of the feeder terminal FTU and the traveling wave module in the scheme is independent of each other, avoiding the interference of the power supply system of the feeder terminal FTU on the traveling wave module.

[0034] At the same time, after power failure, the requirements for processing, storage and transmission of traveling wave signals need to be met, and energy storage capacitors need to be configured.

[0035] In summary, the power supply provided by the capacitor power supply in the deep fusion circuit breaker is designed to provide power supply for the traveling wave module. The power input is the output of the capacitor power supply of the circuit breaker, and the circuit provides stable, low-noise and reliable independent power supply for the traveling wave module, avoiding interference from the FTU system; equipped with energy storage elements to meet the requirements of 500mS signal processing, storage and transmission after power failure.

[0036] 10KV deep fusion circuit breaker system, can be power frequency AC sampling signal acquisition, realize the function such as breaking, closing, using capacitor power supply scheme;At the same time support the collection function of traveling wave high frequency characteristic signal, the high frequency traveling wave characteristic signal collected by the sampling current sensor can be directly transmitted to the traveling wave module through the internal wiring, which reduces the influence of the connector impedance and long cable parasitic parameters on the signal.

[0037] After the high frequency characteristic signal is collected, the traveling wave module processes it, and after the processing is completed, it communicates with the feeder terminal FTU through wireless communication mode.

[0038] Capacitor power supply module, including: high voltage, low voltage capacitor power supply module, power supply transformer, rectifier protection circuit, which can be directly powered to the traveling wave module through the power supply integrated power supply circuit.

[0039] Feeder terminal FTU can realize the functions of conventional power frequency signal acquisition, remote signaling, remote control, fault judgment, etc., and the traveling wave module exchanges information through wireless communication and other ways, and reports fault information and fault positioning information to the master station through wireless communication and other ways.

[0040] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0041] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. Especially, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can refer to the part of the method embodiment.

[0042] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent 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 application.

Claims

1. A 10 KV overhead line traveling wave distance measuring device comprising: 10KV deep fusion circuit breaker system, integrated power supply module, traveling wave module, feeder terminal FTU, characterized in that the traveling wave module comprises three electric signal collection circuits, a signal processing circuit and a communication transmission circuit; The 10KV deep fusion circuit breaker system supplies power to the traveling wave module through the integrated power supply module, and the traveling wave module transmits signals to the feeder terminal FTU through 433M wireless communication. The three electric signal collection circuits are connected to the signal processing circuit, and the signal processing circuit transmits the processed electric signals to the communication transmission circuit. The electric signal collection circuit comprises a high-frequency current coil, a characteristic signal acquisition circuit and a signal conditioning circuit. The high-frequency current coil collects electric signals from single-phase power in 10KV three-phase power, converts the collected electric signals into voltage acquisition values, and transmits the voltage acquisition values to the signal conditioning circuit for amplification and transmission to the signal processing circuit.

2. The 10 KV overhead line traveling wave distance relay device of claim 1, wherein, The high-frequency current coil uses an ultra-microcrystalline iron core.

3. The 10 KV overhead line traveling wave distance relay device of claim 1, wherein, The signal conditioning circuit comprises a 4-gain circuit and an 8-gain circuit connected in parallel. The 4-gain circuit and the 8-gain circuit have the same circuit structure, which is as follows: a capacitor C6 connected to the characteristic signal acquisition circuit, the other end of the capacitor C6 connected to a capacitor C7, and the other end of the capacitor C7 connected to the non-inverting input terminal of an operational amplifier U2A. The inverting power input terminal of the operational amplifier U2A is connected to a capacitor C8, and the other end of the capacitor C8 is grounded. The non-inverting power input terminal of the operational amplifier U2A is connected to a capacitor C4, and the other end of the capacitor C4 is grounded. The inverting input terminal of the operational amplifier U2A is connected to a capacitor C2, a resistor R4 and a resistor R3, the other end of the resistor R4 is grounded, the capacitor C2 and the resistor R4 are connected in parallel, and the other end is connected to the output terminal of the operational amplifier U2A. It also includes a resistor R7 connected to the output terminal of the operational amplifier U2A at one end and connected to the connection between the capacitor C6 and the capacitor C7 at the other end. The output terminal of the operational amplifier U2A is connected to a resistor R5, the other end of the resistor R5 is connected to a capacitor C9 and the non-inverting input terminal of an operational amplifier U1A, and the other end of the capacitor C9 is grounded. The inverting power input terminal of the operational amplifier U1A is connected to a capacitor C5, and the other end of the capacitor C5 is grounded. The non-inverting power input terminal of the operational amplifier U1A is connected to a capacitor C3, and the other end of the capacitor C3 is grounded. The inverting input terminal of the operational amplifier U1A is connected to a capacitor C1, a resistor R2 and a resistor R1, the other end of the resistor R2 is grounded, the capacitor C1 and the resistor R2 are connected in parallel, and the other end is connected to the output terminal of the operational amplifier U1A, which is the output terminal ADCv1 of the signal conditioning circuit.

4. The 10 KV overhead line traveling wave distance relay device of claim 1, wherein, The structure of the integrated power supply module comprises a protection circuit, a step-down voltage stabilizing circuit, an LDO low-noise device and an energy storage capacitor management. The output terminal of the protection circuit is connected to the input terminal of the step-down voltage stabilizing circuit, the output terminal of the step-down voltage stabilizing circuit is connected to the LDO low-noise device, and the LDO low-noise device is connected to the energy storage capacitor management. The protection circuit structure is as follows: one end of the pressure sensitive resistor RV1 is grounded, the other end is connected with the pressure sensitive resistor RV2 and the adjustable resistor F1, the other end of the pressure sensitive resistor RV2 is connected with the pressure sensitive resistor RV3, the other end of the pressure sensitive resistor RV3 is grounded; The other end of the adjustable resistor F1 is connected with the capacitor CY1, the capacitor CX1 and the input end VIN of the chip U2, the other end of the capacitor CX1 is connected with the capacitor CY2, the other end of the capacitor CY2 is grounded, and the other end of the capacitor CY1 is grounded; The enabling end of the chip U2 is connected with the resistor R14 and the resistor R16, the resistor R14 is connected with the capacitor C6 and the input end VIN of the chip U2, the resistor R16 is connected with the capacitor C6 and the resistor R17, the other end of the resistor R17 is connected with the clock input end RT / SYNC of the chip U2; The BOOT end of the chip U2 is connected with the capacitor C1, the other end of the capacitor C1 is connected with the inductor L1, the negative electrode of the diode D2 and the SW end of the chip U2, the positive electrode of the diode D2 is grounded, the capacitor C4 and the resistor R13, the other end of the capacitor C4 is connected with the SS end of the chip U2, the other end of the resistor R13 is connected with the resistor R8, the other end of the resistor R8 is connected with the inductor L1, and the inductor L1 is connected to the step-down voltage stabilizing circuit.

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