Line power failure nuclear phase device

Abstract

The invention discloses a line power failure nuclear phase device which comprises a power frequency alternating current signal generator and a signal receiving device, and the signal receiving device is matched with the power frequency alternating current signal generator to achieve line nuclear phase. The signal receiving device comprises a receiving host, an induced voltage sensor X and an induced voltage sensor Y; the power frequency alternating current signal generator outputs adjustable alternating current voltage and adjustable frequency signals, the phase angle difference of two output power supplies can be adjusted within a preset range, and the phase stepping can select multiple gears; the power frequency alternating current signal generator comprises a battery power supply module, a DC / DC boosting unit, an inverter circuit module, a phase adjusting module, a high-voltage output module and a main control unit which are connected in sequence. The main control unit is electrically connected with the DC / DC boosting unit, the inverter circuit module and the phase adjusting module. The inductive voltage sensor X and the inductive voltage sensor Y are consistent in structure, and each inductive voltage sensor comprises an inductive acquisition terminal, an amplitude limiting protection module, a signal filtering unit, a signal conditioning module, a coding modulation unit and a wireless transmitting module which are connected in sequence.

Description

Technical Field

[0001] This invention relates to the field of power system testing technology, specifically to a phase verification device for power outages. Background Technology

[0002] In power transmission and distribution networks, phase verification must be carried out after the construction, maintenance, or renovation of lines to ensure that the phase sequence and phase at both ends of the line are consistent. This prevents serious accidents such as transformer burnout and relay protection malfunctions caused by phase misconnections, ensuring the safe and stable operation of the power grid. Currently, the most commonly used phase verification method in the industry is the megohmmeter DC phase verification method. Its principle is to apply a 500V to 2500V high-voltage DC current to the line to be verified using a megohmmeter, and measure the insulation resistance between each phase on the opposite side of the line. If the resistance between two phases approaches zero, they are considered to be in phase. Although this method is simple to operate and low in cost, it is only suitable for scenarios where there is no grounding or low-impedance load at the end of the line, and has significant limitations in modern GIS substations.

[0003] In recent years, with the advancement of smart grid construction, the proportion of GIS substations with voltage levels of 110kV and above has been increasing year by year. To simplify the structure and reduce costs, the electromagnetic voltage transformers in these substations generally adopt a design where the internal short-circuit at the tail end is directly led out to the outer casing for grounding, resulting in a fixed low-impedance loop between the line and the ground. When using the traditional DC phase comparison method, the applied DC voltage will be directly grounded through the transformer's short-circuit loop. Regardless of whether they are in phase, the insulation resistance approaches 0, making it impossible to accurately determine the phase relationship. This directly leads to the failure of the phase comparison operation, requiring the additional removal of the transformer grounding device or the use of temporary wiring. This not only increases operational complexity but may also damage the equipment's sealing performance, causing internal insulation faults in the GIS equipment.

[0004] Meanwhile, existing phase verification devices also have several technical pain points: First, the applicable voltage range is narrow: most devices only support 10kV and above high-voltage lines, which cannot meet the phase verification requirements of 5V to 10kV low-voltage lines in the power distribution network; Second, they rely on external power supply: generators or temporary power supplies need to be carried when working on site, which is inconvenient in remote substations or outdoor scenarios; Third, the measurement accuracy is insufficient: it is difficult to meet the stringent requirements of smart grids for phase verification accuracy; Finally, the modularity is low: the integration of sensors and the host is high, and the whole system needs to be repaired after failure, resulting in high maintenance costs and long cycles.

[0005] Therefore, developing a phase detection device that can adapt to the special scenarios of GIS substations, cover a wide voltage level, and has high precision and portability has become an urgent need in the field of power detection. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention discloses a phase comparison device for power outage.

[0007] To achieve the above objectives, the present invention employs the following technical means:

[0008] A power outage phase comparison device includes a power frequency AC signal generator and a signal receiving device. The signal receiving device works in conjunction with the power frequency AC signal generator to perform line phase comparison. The signal receiving device includes a receiver host and induced voltage sensors X and Y, which are wirelessly connected to the receiver host. The power frequency AC signal generator can output adjustable AC voltage and adjustable frequency signals. The phase angle difference between the two power supplies can be adjusted within a preset range, and the phase step can be selected in multiple levels.

[0009] The power frequency AC signal generator includes a battery power supply module, a DC / DC boost unit, an inverter circuit module, a phase adjustment module, a high voltage output module, and a main control unit connected in sequence. The main control unit is electrically connected to the DC / DC boost unit, the inverter circuit module, and the phase adjustment module, respectively.

[0010] The induced voltage sensor X and induced voltage sensor Y have the same structure, both including a sensing acquisition terminal, a limiting protection module, a signal filtering unit, a signal conditioning module, a coding modulation unit, and a wireless transmission module connected in sequence. The sensing acquisition terminal adopts a ring-shaped metal probe structure with an internal electromagnetic coupling coil.

[0011] Preferably, the receiving host is equipped with a full-color high-definition touch screen, which can simultaneously display the phase, frequency, line voltage, and power information collected by the induced voltage sensor, as well as the vector diagram, phase difference, and phase comparison results of the two lines;

[0012] The receiving host includes a wireless receiving module, a decoding and correction unit, an MCU data processing unit, a display driver module, a voice broadcast module, and a power management unit. The wireless receiving module, the decoding and correction unit, the MCU data processing unit, and the display driver module are connected in sequence. The voice broadcast module is electrically connected to the MCU data processing unit, and the power management unit supplies power to each module.

[0013] Preferably, the signal filtering unit adopts a third-order active low-pass filter, and the coding modulation unit adopts frequency shift keying modulation.

[0014] Preferably, the receiving signal device supports the State Grid standard Bluetooth protocol customization, has contact phase comparison and short-range phase comparison functions, is equipped with a real-person voice broadcast module, can switch between Chinese / English bilingual display, and supports switching between line voltage and phase voltage measurement; the MCU data processing unit adopts a dedicated series microcontroller, and the wireless transmission modules of the induced voltage sensor X and induced voltage sensor Y and the wireless receiving module of the receiving host all use specific frequency band transmission and support frequency hopping anti-interference.

[0015] Preferably, the power frequency AC signal generator is controlled by a high-speed single-chip microcomputer and adopts inverter power supply technology. The voltage output accuracy, frequency accuracy and phase accuracy all meet the preset requirements. The power frequency AC signal generator is equipped with a high voltage output indicator, an alarm sound warning module and a hardware emergency stop button.

[0016] The inverter circuit module adopts a full-bridge inverter topology and realizes DC-to-AC conversion through IGBT power transistors. The phase adjustment module adopts a combination circuit of digital potentiometer and operational amplifier, and controls the phase offset by outputting PWM signal through the main control unit.

[0017] The high-voltage output module includes a step-up transformer, a voltage sampling circuit, and an overvoltage protection unit connected in sequence. The voltage sampling circuit adopts a voltage divider resistor network, and the overvoltage protection unit has a built-in thyristor emergency trip circuit.

[0018] Preferably, the operating environment temperature and humidity of the signal receiving device meet the preset range; the size of the receiving host meets the requirements of portable design, and the length of the matching insulating rod is adapted to the high-voltage operation requirements; the housing of the inductive voltage sensor adopts epoxy resin potting process, and its impact voltage resistance meets the requirements of high-voltage scenarios.

[0019] Preferably, the receiver, the induced voltage sensor X, the induced voltage sensor Y, and the power frequency AC signal generator are all equipped with high-energy lithium batteries.

[0020] Preferably, the phase comparison method of the line power outage phase comparison device includes the following steps:

[0021] Step 1: Connect the test clamps of the power frequency AC signal generator to the induced voltage sensor X and the induced voltage sensor Y respectively. Use the insulating rod to hang the induced voltage sensor X at the preset position of the first phase line to be tested, and hang the induced voltage sensor Y at the preset position of the second phase line to be tested.

[0022] Step 2: Start the power frequency AC signal generator. The main control unit controls the DC / DC boost unit to boost the battery voltage to the preset value. The basic power frequency signal is generated through the inverter circuit module. The phase difference between the two outputs is set by the phase adjustment module and then loaded onto the line by the high voltage output module.

[0023] Step 3: The induced voltage sensor X couples the voltage signal of the first line, and the induced voltage sensor Y couples the voltage signal of the second line. After the surge interference is suppressed by the amplitude limiting protection module, the harmonics are filtered out by the signal filtering unit. The signal conditioning module converts the analog signal into a standard level, and after encoding and modulation, it is transmitted through its respective wireless transmission module.

[0024] Step 4: The wireless receiving module of the receiving host synchronously acquires the transmission signals of the induced voltage sensor X and the induced voltage sensor Y. The decoding and correction unit restores the two data channels. The MCU data processing unit calculates the phase difference between the two and generates a vector diagram. The display driver module displays the vector diagram on the touch screen, and the voice broadcast module broadcasts the phase comparison results simultaneously.

[0025] Step 5: After phase verification is completed, press the stop button. The main control unit will cut off the inverter circuit output. The hardware emergency stop button can trigger the overvoltage protection unit to force power off. After confirming that the line is de-energized, remove the induced voltage sensor X, induced voltage sensor Y and other equipment.

[0026] The line power outage phase comparison device provided by this invention has the following significant advantages compared with the prior art:

[0027] 1. Adapted to special scenarios in GIS substations

[0028] This device uses the AC phase comparison method to output a power frequency AC signal instead of a traditional DC signal. This avoids the impact of short circuits at the tail end of electromagnetic voltage transformers in GIS substations. The AC signal will not be directly grounded due to the short circuit when passing through the transformer, and it can form an effective phase comparison. This fundamentally solves the failure problem of the traditional DC phase comparison method. There is no need to temporarily remove the transformer grounding device, simplifying the operation process and ensuring equipment safety.

[0029] 2. Ability to re-enter phases across voltage levels:

[0030] The inductive voltage sensor adopts a wide-range voltage coupling design, and with the adjustable voltage output of the power frequency AC signal generator, it can cover the phase matching requirements of cross-voltage line from low voltage to high voltage. There is no need to carry multiple sets of equipment on site, which improves the convenience of operation and equipment utilization.

[0031] 3. High precision and high stability:

[0032] The signal processing stage employs third-order filtering, temperature compensation, and cross-correlation algorithms to effectively suppress errors caused by line harmonics, electromagnetic interference, and environmental factors, resulting in high accuracy in phase difference measurement. The high-precision voltage regulation design of the power supply module and the closed-loop control of the signal output ensure that the device maintains stable performance during long-term operation and reduces measurement deviations.

[0033] 4. Convenience and safety design:

[0034] All components of the device are designed for portability, with built-in lithium batteries supporting operation without external power supply, making it suitable for outdoor and remote substation scenarios; dual sensors collect data synchronously and transmit wirelessly, reducing on-site wiring; safety indicators and emergency stop protection mechanisms, combined with insulated operating components, provide comprehensive protection for the safety of operators and equipment; voice broadcast and Bluetooth data upload functions improve work efficiency and data management convenience.

[0035] 5. Modular design and ease of maintenance:

[0036] The device is divided into independent modules according to function, and the interfaces of each module are standardized. When a single module fails, there is no need to replace the whole device. Only the corresponding module needs to be repaired or replaced, which reduces maintenance costs and time. Debugging interfaces are reserved to facilitate future firmware upgrades and function expansion, and extend the service life of the equipment. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structural modules of the line power outage phase comparison device of the present invention. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms center, up, down, left, right, vertical, horizontal, inner, and outer, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms first, second, and third are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms installation, connection, and linking should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Working principle of the power outage phase comparison device of this invention:

[0042] The phase comparison device for this power outage achieves phase comparison through a closed-loop process of signal generation → acquisition → processing → result output, which is mainly divided into three links:

[0043] 1. Signal Generation and Output Link – Power Frequency AC Signal Generator

[0044] Power supply startup: The generator's built-in lithium battery outputs low-voltage DC through the battery power supply module, which is then boosted to the high-voltage DC bus voltage, such as 300V, by the DC / DC boost unit to power the subsequent modules;

[0045] Signal conversion: The inverter circuit module, i.e., the full-bridge topology + IGBT, converts high-voltage DC into power frequency AC signal. The main control unit controls the output frequency, such as 45-65Hz, through SPWM modulation.

[0046] Parameter adjustment: The phase adjustment module, namely a digital potentiometer + operational amplifier, adjusts the phase difference between the two output signals under the control of the main controller, such as 0°-359.9°, to meet the needs of different core phase scenarios;

[0047] Safety Output: The high-voltage output module amplifies the AC signal to the target voltage, such as 100V-1500V, through a step-up transformer. The voltage sampling circuit feeds back the voltage to the main controller in real time, forming a closed-loop voltage control. If the voltage exceeds the limit, the thyristor emergency trip circuit triggers protection, and at the same time, the high-voltage indicator light and alarm sound issue a warning.

[0048] 2. Signal Acquisition and Transmission Link – Induced Voltage Sensor X, Induced Voltage Sensor Y

[0049] Signal coupling: The sensor couples voltage signals from the two phase lines to be tested through a ring-shaped metal probe and an electromagnetic coupling coil, without direct contact with the line conductors, thus ensuring high-voltage safety.

[0050] Signal preprocessing: The amplitude limiting protection module suppresses line surge voltage to avoid damage to the internal circuitry; the third-order active low-pass filter filters out high-frequency harmonics and retains the 50Hz power frequency fundamental wave; the signal conditioning module amplifies weak signals to a standard level (e.g., 0~3.3V).

[0051] Wireless transmission: The encoding and modulation unit uses FSK to convert analog signals into digital carrier signals. The induced voltage sensor X and induced voltage sensor Y use different frequencies, such as 433.1MHz / 433.3MHz, to avoid interference. The signals are transmitted to the receiving host through the wireless transmission module.

[0052] 3. Data processing and result output link – Receiving host

[0053] Signal reception and decoding: The wireless receiving module, i.e., dual-channel + frequency hopping anti-interference synchronous reception of signals from induced voltage sensor X and induced voltage sensor Y, is decoded and corrected by the decoding and correction unit to restore the analog signal, and the error is corrected by RC correction and temperature compensation.

[0054] Phase difference calculation: The MCU data processing unit acquires two analog signals through the ADC and calculates the phase difference using a cross-correlation algorithm with an accuracy of up to 0.1°;

[0055] Results Display and Interaction: The display driver module controls the full-color touchscreen to display the parameters of the induced voltage sensor X and induced voltage sensor Y in different areas, such as phase, frequency, line voltage, vector comparison diagram, and phase comparison results: in-phase / out-of-phase; the voice broadcast module broadcasts the results synchronously, making it convenient for operators to obtain them in real time; the Bluetooth module can upload the data to the backend system for digital archiving.

[0056] 4. Power supply guarantee link

[0057] The generator, main unit, and sensor are all equipped with high-energy lithium batteries and are powered by their respective power management modules. For example, the main unit outputs 5V / 3.3V and supports automatic shutdown when there is no operation, extending the battery life. The generator has a battery life of ≥8 hours and the sensor has a battery life of ≥12 hours, which meets the requirements for long-term outdoor operation.

[0058] Example 1: Phase Comparison of 110kV GIS Substation Lines—Solving the Failure Scenarios of Traditional DC Phase Comparison

[0059] 1. Scene Background

[0060] Two new outgoing lines are being built at a 110kV GIS substation, requiring phase verification to confirm phase consistency. The tail end of the electromagnetic voltage transformer in the substation is short-circuited to ground, rendering the traditional DC phase verification method ineffective. Furthermore, the electromagnetic environment within the substation is complex, placing high demands on the equipment's anti-interference capabilities.

[0061] 2. Equipment Preparation and Deployment

[0062] Preset parameters: Generator output voltage is set to 500V (to meet the coupling requirements of 110kV lines), frequency is 50Hz, and phase difference is initially set to 0°; the host is enabled with frequency hopping anti-interference function and Bluetooth is used to pair with the substation backend system.

[0063] Safety Deployment: Operators wear insulated gloves and boots, and hold a 3-meter insulated pole. They attach sensor X to the far-end tower detection point of line 1 and sensor Y to the far-end detection point of line 2. The generator is placed in a safe area on the line side and connected to the two lines through a high-voltage test clamp. The main unit is placed in the control room and wirelessly paired with X / Y (at a distance of approximately 80 meters, with no obstructions).

[0064] 3. Phase Identification Procedure

[0065] Signal output: When the generator is started, the main controller controls the DC / DC converter to boost the voltage to 300V, the inverter generates a 50Hz AC signal, the phase adjustment module keeps the two channels in phase, and the 500V signal is output to the line through the step-up transformer;

[0066] Signal acquisition and processing: X / Y lines are coupled separately, filtered, conditioned, and FSK encoded before being wirelessly transmitted to the host; after receiving the signal, the host decodes, corrects, and calculates the phase difference (measured to be 0.3°).

[0067] Result judgment and recording: The host screen displays "X phase 120.1°, Y phase 120.4°, phase difference 0.3°, determined to be in phase", and announces it in sync with voice; the data is uploaded to the substation backend via Bluetooth to generate a phase verification report;

[0068] Safe recovery: Press the generator stop button to cut off the signal output; after the line is tested and confirmed to be de-energized, recover X / Y through the insulating rod and turn off the power to all equipment.

[0069] 4. Advantages of scene adaptation

[0070] The AC phase comparison method avoids the effects of short circuits in current transformers and solves the failure problem of traditional DC phase comparison.

[0071] Frequency hopping anti-interference and differentiated frequency transmission enable stable signal reception in strong electromagnetic environments;

[0072] The design of the insulating rod and high-voltage warning system ensures the safety of high-voltage operations in GIS substations.

[0073] Example 2: Phase verification between 10kV distribution lines and 0.4kV transformer substation lines – a cross-voltage level scenario

[0074] 1. Scene Background

[0075] A power distribution network needs to extend a 10kV line to a newly built 0.4kV transformer substation. It is necessary to verify the phase consistency between the 10kV line and the incoming line of the 0.4kV transformer substation. The work site is an outdoor transformer substation with no external power supply and is subject to harmonic interference from household appliances.

[0076] 2. Equipment Preparation and Deployment

[0077] Preset parameters: Generator output voltage is set to 220V (compatible with 10kV / 0.4kV cross-voltage coupling), frequency is 50Hz, and phase difference is set to 0°; the host is enabled in enhanced filtering mode to deal with harmonic interference.

[0078] Portable deployment: The generator and main unit are carried to the distribution area by the operator (total weight ≤10kg, easy to move); Sensor X is hung on the insulator of the 10kV line via an insulating rod, and Sensor Y is hung on the terminal of the 0.4kV distribution area incoming line (distance about 50 meters, with trees as obstruction).

[0079] 3. Phase Identification Procedure

[0080] Signal output: The generator is powered by a built-in lithium battery (fully charged, with a runtime of about 10 hours). After startup, it outputs a 220V / 50Hz signal to two lines.

[0081] Signal acquisition and anti-interference processing: After X / Y coupling, a third-order filter removes the 3rd and 5th harmonics of household appliances; the host computer avoids signal fluctuations caused by obstruction through frequency hopping technology and successfully receives the X / Y signal;

[0082] Result Judgment and Application: The MCU calculates the phase difference to be 120.2° (the theoretical phase difference between 10kV and 0.4kV lines is 120°, and the error is within the allowable range). The host displays "In Phase Judgment" and provides a voice prompt. Operators confirm the correct phase of the transformer area wiring based on the result to avoid damage to user equipment due to incorrect phase connection.

[0083] Work completion: After the equipment is recovered, the host automatically saves the phase data and can upload it to the power distribution operation and maintenance platform via Bluetooth connection to a mobile hotspot.

[0084] 4. Advantages of scene adaptation

[0085] The cross-voltage adaptability design eliminates the need to carry multiple sets of equipment, meeting the phase matching requirements of 10kV / 0.4kV.

[0086] Built-in lithium battery enables operation without external power supply, suitable for outdoor transformer area scenarios;

[0087] Enhanced filtering and frequency hopping interference immunity are implemented to address the impact of civilian harmonics and blockages, ensuring reliable results.

[0088] The examples provided in this invention are not intended to limit the implementation. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations, and any obvious variations or modifications derived therefrom are still within the scope of this invention.

Claims

1. A phase comparison device for power outages, characterized in that, The system includes a power frequency AC signal generator and a signal receiving device. The signal receiving device works in conjunction with the power frequency AC signal generator to achieve line phase matching. The signal receiving device includes a receiver host and induced voltage sensors X and Y, which are wirelessly connected to the receiver host. The power frequency AC signal generator can output adjustable AC voltage and adjustable frequency signals. The phase angle difference between the two power supplies can be adjusted within a preset range, and the phase step can be selected in multiple levels. The power frequency AC signal generator includes a battery power supply module, a DC / DC boost unit, an inverter circuit module, a phase adjustment module, a high voltage output module, and a main control unit connected in sequence. The main control unit is electrically connected to the DC / DC boost unit, the inverter circuit module, and the phase adjustment module, respectively. The induced voltage sensor X and induced voltage sensor Y have the same structure, both including a sensing acquisition terminal, a limiting protection module, a signal filtering unit, a signal conditioning module, a coding modulation unit, and a wireless transmission module connected in sequence. The sensing acquisition terminal adopts a ring-shaped metal probe structure with an internal electromagnetic coupling coil.

2. The line power outage phase comparison device according to claim 1, characterized in that, The receiving host is equipped with a full-color high-definition touch screen, which can simultaneously display the phase, frequency, line voltage, and power information collected by the induced voltage sensor, as well as the vector diagram, phase difference, and phase comparison results of the two lines; The receiving host includes a wireless receiving module, a decoding and correction unit, an MCU data processing unit, a display driver module, a voice broadcast module, and a power management unit. The wireless receiving module, the decoding and correction unit, the MCU data processing unit, and the display driver module are connected in sequence. The voice broadcast module is electrically connected to the MCU data processing unit, and the power management unit supplies power to each module.

3. The line power outage phase comparison device according to claim 1, characterized in that, The signal filtering unit adopts a third-order active low-pass filter, and the coding modulation unit adopts frequency shift keying modulation.

4. The line power outage phase comparison device according to claim 1, characterized in that, The receiving signal device supports the State Grid standard Bluetooth protocol customization, has contact phase comparison and short-range phase comparison functions, is equipped with a real-person voice broadcast module, can switch between Chinese / English bilingual display, and supports switching between line voltage and phase voltage measurement; the MCU data processing unit adopts a dedicated series microcontroller, and the wireless transmission modules of the induced voltage sensor X and induced voltage sensor Y and the wireless receiving module of the receiving host all use specific frequency band transmission and support frequency hopping anti-interference.

5. A line power outage phase comparison device according to claim 1, characterized in that, The power frequency AC signal generator is controlled by a high-speed single-chip microcomputer and adopts inverter power supply technology. The voltage output accuracy, frequency accuracy and phase accuracy all meet the preset requirements. The power frequency AC signal generator is equipped with a high voltage output indicator, an alarm sound warning module and a hardware emergency stop button. The inverter circuit module adopts a full-bridge inverter topology and realizes DC-to-AC conversion through IGBT power transistors. The phase adjustment module adopts a combination circuit of digital potentiometer and operational amplifier, and controls the phase offset by outputting PWM signal through the main control unit. The high-voltage output module includes a step-up transformer, a voltage sampling circuit, and an overvoltage protection unit connected in sequence. The voltage sampling circuit adopts a voltage divider resistor network, and the overvoltage protection unit has a built-in thyristor emergency trip circuit.

6. A line power outage phase comparison device according to claim 1, characterized in that, The operating environment temperature and humidity of the signal receiving device meet the preset range; the size of the receiving host meets the requirements of portable design, and the length of the matching insulating rod is adapted to the high-voltage operation requirements; the housing of the inductive voltage sensor adopts epoxy resin potting process, and its impact voltage resistance meets the requirements of high-voltage scenarios.

7. A line power outage phase comparison device according to claim 1, characterized in that, The receiver, the induced voltage sensor X, the induced voltage sensor Y, and the power frequency AC signal generator are all equipped with high-energy lithium batteries.

8. A line power outage phase comparison device according to claim 1, characterized in that, The phase comparison method of the line power outage phase comparison device includes the following steps: Step 1: Connect the test clamps of the power frequency AC signal generator to the induced voltage sensor X and the induced voltage sensor Y respectively. Use the insulating rod to hang the induced voltage sensor X at the preset position of the first phase line to be tested, and hang the induced voltage sensor Y at the preset position of the second phase line to be tested. Step 2: Start the power frequency AC signal generator. The main control unit controls the DC / DC boost unit to boost the battery voltage to the preset value. The basic power frequency signal is generated through the inverter circuit module. The phase difference between the two outputs is set by the phase adjustment module and then loaded onto the line by the high voltage output module. Step 3: The induced voltage sensor X couples the voltage signal of the first line, and the induced voltage sensor Y couples the voltage signal of the second line. After the surge interference is suppressed by the amplitude limiting protection module, the harmonics are filtered out by the signal filtering unit. The signal conditioning module converts the analog signal into a standard level, and after encoding and modulation, it is transmitted through its respective wireless transmission module. Step 4: The wireless receiving module of the receiving host synchronously acquires the transmission signals of the induced voltage sensor X and the induced voltage sensor Y. The decoding and correction unit restores the two data channels. The MCU data processing unit calculates the phase difference between the two and generates a vector diagram. The display driver module displays the vector diagram on the touch screen, and the voice broadcast module broadcasts the phase comparison results simultaneously. Step 5: After phase verification is completed, press the stop button. The main control unit will cut off the inverter circuit output. The hardware emergency stop button can trigger the overvoltage protection unit to force power off. After confirming that the line is de-energized, remove the induced voltage sensor X, induced voltage sensor Y and other equipment.

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