Four-channel power line fault diagnosis positioning device

Abstract

The utility model discloses a four-channel electric power circuit fault diagnosis and positioning device, which belongs to the field of electric power circuit fault diagnosis and realizes instant detection and high-precision positioning of faults and accurate judgment of fault types by adopting four-channel electric power circuit fault diagnosis and positioning. The system mainly comprises a controller, the controller is respectively connected with a three-phase current transformer and a zero sequence current transformer through a traveling wave acquisition signal conditioning module, the controller is also respectively connected with a power supply module, a positioning module and a communication module, and the communication module is connected with a server. The four-channel power line fault diagnosis device is mainly used for four-channel power line fault diagnosis.

Description

Technical Field

[0001] The utility model relates to the field of power line fault diagnosis, and in particular to a four-channel power line fault diagnosis and positioning device. Background Art

[0002] In power systems, the rapid diagnosis and accurate location of line faults are crucial to ensuring their stable operation. Traditional fault location technologies rely on manual inspections or single-point measurement-based fault location methods, which suffer from slow response and low location accuracy. Traditional single-channel circuit detection is relatively inaccurate for fault detection and location. As power systems expand in size and complexity, the data processing and analysis capabilities of traditional circuit systems are clearly insufficient to meet current operating conditions. There is an urgent need for a new circuit detection system that can monitor power line status in real time and quickly and accurately diagnose and locate faults. Utility Model Content

[0003] The purpose of the utility model is to provide a four-channel power line fault diagnosis and positioning device, which adopts four-channel power line fault diagnosis and positioning to achieve instant fault detection, high-precision positioning and accurate judgment of fault type.

[0004] The utility model is realized through the following technical solutions:

[0005] A four-channel power line fault diagnosis and positioning device includes a controller, which is respectively connected to a three-phase current transformer and a zero-sequence current transformer through a traveling wave acquisition signal conditioning module. The controller is also respectively connected to a power module, a positioning module and a communication module, and the communication module is connected to a server; the traveling wave acquisition signal conditioning module includes a traveling wave acquisition signal conditioning circuit, and the traveling wave acquisition signal conditioning circuit includes an operational amplifier U17, the non-inverting input terminal of the operational amplifier U17 is connected to the connector J4 through a resistor R42, the non-inverting input terminal of the operational amplifier U17 is also connected to a feedback resistor R40, the positive power supply pin of the operational amplifier U17 is connected to an anti-interference capacitor C51, the inverting input terminal of the operational amplifier U17 is connected to a resistor R43, the inverting input terminal of the operational amplifier U17 is connected to the output terminal of the operational amplifier U17 through a resistor R47, the output terminal of the operational amplifier U17 is connected to a unit gain high-pass filter I, and the connector J4 is connected to a unit gain high-pass filter II.

[0006] Furthermore, the unity gain high-pass filter I includes an operational amplifier U18, the output end of the operational amplifier U17 is connected to the non-inverting input end of the operational amplifier U18 through the filter capacitor C53 and the filter capacitor C54, the non-inverting input end of the operational amplifier U18 is connected to the balancing resistor R44, and a feedback resistor R41 is connected between the filter capacitor C53 and the filter capacitor C54, and the feedback resistor R41 is also connected to the output end of the operational amplifier U18.

[0007] Furthermore, the unity gain high-pass filter II includes an operational amplifier U28A and an operational amplifier U28B, the connector J4 is connected to the non-inverting input terminal of the operational amplifier U28A through the filter capacitor C74 and the filter capacitor C73, a feedback resistor R64 is connected between the filter capacitor C74 and the filter capacitor C73, the feedback resistor R64 is connected to the output terminal of the operational amplifier U28A, the non-inverting input terminal of the operational amplifier U28A is also connected to the balancing resistor R63, the output terminal of the operational amplifier U28A is connected to the inverting input terminal of the operational amplifier U28B through the resistor R66, a feedback resistor R67 is connected between the inverting input terminal of the operational amplifier U28B and the output terminal of the operational amplifier U28B, an anti-interference capacitor C114 is connected in parallel to the feedback resistor R67, and the output terminal of the operational amplifier U28B is connected to the filter capacitor C115.

[0008] Furthermore, the power supply module includes a 5V power supply circuit and a 3.3V power supply circuit, and the 5V power supply circuit and the 3.3V power supply circuit are connected through a low voltage difference linear regulator to realize 3.3V and 5V power conversion.

[0009] Furthermore, the 3.3V power supply circuit includes a power management chip U62, the EN pin of the power management chip U62 is connected to pin 3 of the field effect transistor Q21, the FB pin of the power management chip U62 is respectively connected to the resistor R146 and the resistor R148, the VIN pin of the power management chip U62 is respectively connected to the filter capacitor C150 and the filter capacitor C151, and the output end of the power management chip U62 is connected to the filter capacitor C152, the filter capacitor C153, the filter capacitor C154, and the filter capacitor C155, and the filter capacitor C155 is connected in parallel with the current limiting resistor R145 and the indicator light D10.

[0010] Furthermore, the 5V power supply circuit includes a power management chip U63, a resistor R151 is connected between the VIN pin and the EN pin of the power management chip U63, the FB pin of the power management chip U62 is connected to the resistor R154 and the resistor R157 respectively, the VIN pin of the power management chip U63 is connected to the filter capacitor C158 and the filter capacitor C159 respectively, the output end of the power management chip U63 is connected to the filter capacitor C160, the filter capacitor C161, and the filter capacitor C162, and the filter capacitor C162 is connected in parallel with the current limiting resistor R153 and the indicator light D11.

[0011] Furthermore, the positioning module is a GPS positioning module or a Beidou positioning module.

[0012] Furthermore, the communication module is a 4G wireless communication module.

[0013] Furthermore, the three-phase current transformer includes an A-phase current transformer, a B-phase current transformer and a C-phase current transformer, and the A-phase current transformer, the B-phase current transformer and the C-phase current transformer are all magnetic core open current transformers.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. Four-channel traveling wave acquisition signal conditioning module: It can collect traveling wave signals in the line in real time, including transient changes in voltage and current, and provide raw data for fault detection.

[0016] 2. The GPS / Beidou positioning module provides high-precision timing for the device.

[0017] 3. Use 4G / 5G or private network communication technology to send fault diagnosis and location information to the monitoring center in real time, enabling remote monitoring and fault response.

[0018] 4. Power management system: A combination of solar panels and lithium iron phosphate batteries is used to ensure long-term stable operation of the device in field environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 It is a traveling wave acquisition signal conditioning circuit of the utility model;

[0021] Figure 3 It is a 3.3V power supply circuit of the utility model;

[0022] Figure 4 The utility model relates to a 5.5V power supply circuit. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figure 1 – Figure 2 As shown, a four-channel power line fault diagnosis and positioning device includes a controller, which is respectively connected to a three-phase current transformer and a zero-sequence current transformer through a traveling wave acquisition signal conditioning module. The controller is also respectively connected to a power module, a positioning module and a communication module, and the communication module is connected to a server; the traveling wave acquisition signal conditioning module includes a traveling wave acquisition signal conditioning circuit, and the traveling wave acquisition signal conditioning circuit includes an operational amplifier U17, the non-inverting input terminal of the operational amplifier U17 is connected to the connector J4 through a resistor R42, the non-inverting input terminal of the operational amplifier U17 is also connected to a feedback resistor R40, the positive power supply pin of the operational amplifier U17 is connected to an anti-interference capacitor C51, the inverting input terminal of the operational amplifier U17 is connected to a resistor R43, the inverting input terminal of the operational amplifier U17 is connected to the output terminal of the operational amplifier U17 through a resistor R47, the output terminal of the operational amplifier U17 is connected to a unit gain high-pass filter I, and the connector J4 is connected to a unit gain high-pass filter II.

[0026] Example 2

[0027] like Figure 3 – Figure 4As shown, a four-channel power line fault diagnosis and positioning device, the unit gain high-pass filter I includes an operational amplifier U18, the output end of the operational amplifier U17 is connected to the non-inverting input end of the operational amplifier U18 through the filter capacitor C53 and the filter capacitor C54, the non-inverting input end of the operational amplifier U18 is connected to the balancing resistor R44, a feedback resistor R41 is connected between the filter capacitor C53 and the filter capacitor C54, and the feedback resistor R41 is also connected to the output end of the operational amplifier U18; the unit gain high-pass filter II includes an operational amplifier U28A and an operational amplifier U28B, the connector J4 is connected to the non-inverting input end of the operational amplifier U28A through the filter capacitor C74 and the filter capacitor C73, and a feedback resistor R41 is connected between the filter capacitor C74 and the filter capacitor C73. Resistor R64, feedback resistor R64 is connected to the output of operational amplifier U28A, the non-inverting input of operational amplifier U28A is also connected to a balancing resistor R63, the output of operational amplifier U28A is connected to the inverting input of operational amplifier U28B via resistor R66, feedback resistor R67 is connected between the inverting input of operational amplifier U28B and the output of operational amplifier U28B, anti-interference capacitor C114 is connected in parallel to feedback resistor R67, and the output of operational amplifier U28B is connected to a filter capacitor C115; the power supply module includes a 5V power supply circuit and a 3.3V power supply circuit, the 5V power supply circuit and the 3.3V power supply circuit are connected through a low voltage drop linear regulator to achieve 3.3V and 5V power conversion, the existing technology is not repeated here; the 3.The 3V power supply circuit includes a power management chip U62, the EN pin of the power management chip U62 is connected to pin 3 of the field effect tube Q21, the FB pin of the power management chip U62 is connected to the resistor R146 and the resistor R148 respectively, the VIN pin of the power management chip U62 is connected to the filter capacitor C150 and the filter capacitor C151 respectively, the output end of the power management chip U62 is connected to the filter capacitor C152, the filter capacitor C153, the filter capacitor C154, and the filter capacitor C155, and the filter capacitor C155 is connected in parallel with the current limiting resistor R145 and the indicator light D10; the 5V power supply circuit includes a power management chip U63, a resistor R151 is connected between the VIN pin and the EN pin of the power management chip U63, and the FB pin of the power management chip U62 is connected to the filter capacitor C152, the filter capacitor C153, the filter capacitor C154, and the filter capacitor C155. The filter capacitor C155 is connected in parallel with the current limiting resistor R145 and the indicator light D10. Resistors R154 and R157 are connected separately. The VIN pin of the power management chip U63 is connected to filter capacitors C158 and C159 respectively. The output end of the power management chip U63 is connected to filter capacitors C160, C161, and C162. Filter capacitor C162 is connected in parallel with current-limiting resistor R153 and indicator light D11. The positioning module is a GPS positioning module or a Beidou positioning module. The communication module is a 4G wireless communication module. The three-phase current transformer includes an A-phase current transformer, a B-phase current transformer, and a C-phase current transformer. The A-phase current transformer, the B-phase current transformer, and the C-phase current transformer are all magnetic core open-type current transformers. The unexplained parts are all prior art and are not repeated here. The rest is the same as in Example 1.

[0028] By controlling the base voltage of field-effect transistor Q21, the output of power management chip U62 can be controlled. The FB pin of the power management chip is connected to resistors R146 and R148, controlling the output of power management chip U62 to be constant at 3.3V. The VIN pin of power management chip U63 is connected to +12V. When the +12V voltage is available, power management chip U63 can output voltage. The FB pin of power management chip U63 is connected to resistors R154 and R157, controlling the output of power management chip U63 to be constant at +5V.

[0029] The function of the feedback resistor R40 and the resistor R42 is to raise the output voltage of the operational amplifier U17 to A_VREF. The resistor R47, the resistor R43 and the operational amplifier U17 form an inverting amplifier with an amplification factor of 5 times, thus achieving the amplification of the input signal. The output level of the operational amplifier U18 is also raised to A_VREF. The signal amplified by the previous stage passes through a high-pass filter and is converted into a high-frequency signal HA_OUT4. The output level of the operational amplifier U28A is raised to A_VREF. The resistor R66, the feedback resistor R67 and the operational amplifier U28B form an inverting amplifier with an amplification factor of 4.7 times. The signal amplified by the operational amplifier U28B passes through a low-pass filter composed of resistor R68 and filter capacitor C115, and finally obtains the low-frequency signal LA_OUT4. The current traveling wave signal generated at the moment of distribution line fault is amplified and filtered, and then converted into a traveling wave signal HA_OUT4 and a transient signal LA_OUT4. These two signals are connected to the main controller circuit for high-speed acquisition and algorithm processing. This part of the circuit provides data support for device fault diagnosis and positioning.

Claims

1. A four-channel power line fault diagnosis and location device, including a controller, characterized by: The controller is connected to the three-phase current transformer and the zero-sequence current transformer respectively through the traveling wave acquisition signal conditioning module. The controller is also connected to the power module, the positioning module and the communication module respectively, and the communication module is connected to the server; the traveling wave acquisition signal conditioning module includes a traveling wave acquisition signal conditioning circuit, and the traveling wave acquisition signal conditioning circuit includes an operational amplifier U17. The non-inverting input end of the operational amplifier U17 is connected to the connector J4 through the resistor R42. The non-inverting input end of the operational amplifier U17 is also connected to the feedback resistor R40. The positive power supply pin of the operational amplifier U17 is connected to the anti-interference capacitor C51. The inverting input end of the operational amplifier U17 is connected to the resistor R43. The inverting input end of the operational amplifier U17 is connected to the output end of the operational amplifier U17 through the resistor R47. The output end of the operational amplifier U17 is connected to the unit gain high-pass filter I, and the connector J4 is connected to the unit gain high-pass filter II.

2. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The unity gain high-pass filter I includes an operational amplifier U18, the output end of the operational amplifier U17 is connected to the non-inverting input end of the operational amplifier U18 through the filter capacitor C53 and the filter capacitor C54, the non-inverting input end of the operational amplifier U18 is connected to the balancing resistor R44, and a feedback resistor R41 is connected between the filter capacitor C53 and the filter capacitor C54, and the feedback resistor R41 is also connected to the output end of the operational amplifier U18.

3. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The unity gain high-pass filter II includes an operational amplifier U28A and an operational amplifier U28B. The connector J4 is connected to the non-inverting input terminal of the operational amplifier U28A through the filter capacitor C74 and the filter capacitor C73. A feedback resistor R64 is connected between the filter capacitor C74 and the filter capacitor C73. The feedback resistor R64 is connected to the output terminal of the operational amplifier U28A. The non-inverting input terminal of the operational amplifier U28A is also connected to the balancing resistor R63. The output terminal of the operational amplifier U28A is connected to the inverting input terminal of the operational amplifier U28B through the resistor R66. A feedback resistor R67 is connected between the inverting input terminal of the operational amplifier U28B and the output terminal of the operational amplifier U28B. An anti-interference capacitor C114 is connected in parallel to the feedback resistor R67. The output terminal of the operational amplifier U28B is connected to the filter capacitor C115.

4. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The power supply module includes a 5V power supply circuit and a 3.3V power supply circuit, and the 5V power supply circuit and the 3.3V power supply circuit are connected via a low voltage difference linear regulator.

5. The four-channel power line fault diagnosis and positioning device according to claim 4, characterized in that: The 3.3V power supply circuit includes a power management chip U62, the EN pin of the power management chip U62 is connected to pin 3 of the field effect transistor Q21, the FB pin of the power management chip U62 is respectively connected to the resistor R146 and the resistor R148, the VIN pin of the power management chip U62 is respectively connected to the filter capacitor C150 and the filter capacitor C151, and the output end of the power management chip U62 is connected to the filter capacitor C152, the filter capacitor C153, the filter capacitor C154, and the filter capacitor C155. The filter capacitor C155 is connected in parallel with the current limiting resistor R145 and the indicator light D10.

6. The four-channel power line fault diagnosis and positioning device according to claim 4, characterized in that: The 5V power supply circuit includes a power management chip U63, a resistor R151 is connected between the VIN pin and the EN pin of the power management chip U63, the FB pin of the power management chip U62 is connected to the resistor R154 and the resistor R157 respectively, the VIN pin of the power management chip U63 is connected to the filter capacitor C158 and the filter capacitor C159 respectively, the output end of the power management chip U63 is connected to the filter capacitor C160, the filter capacitor C161, and the filter capacitor C162, and the filter capacitor C162 is connected in parallel with the current limiting resistor R153 and the indicator light D11.

7. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The positioning module is a GPS positioning module or a Beidou positioning module.

8. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The communication module is a 4G wireless communication module.

9. The four-channel power line fault diagnosis and positioning device according to claim 1, characterized in that: The three-phase current transformer includes an A-phase current transformer, a B-phase current transformer and a C-phase current transformer, and the A-phase current transformer, the B-phase current transformer and the C-phase current transformer are all magnetic core open current transformers.

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