Line loss troubleshooting equipment with user transformer identification function

Abstract

The invention discloses line loss checking equipment with a user transformer identification function. According to the technical scheme, the line loss checking equipment comprises the steps that a remote communication module is used for transmitting interactive information to a line loss checking equipment mainboard; then the line loss checking equipment main board sends out a special control command in a PWM wave mode, meanwhile, a confirmation instruction is replied to the remote communication module, and the remote communication module replies the confirmation instruction to the main station; after receiving the control command sent by the main board, the user transformer identification sending module converts the control command into a user transformer identification characteristic signal and switches the user transformer identification characteristic signal to a power line network.

Description

Technical Field

[0001] The present invention relates to the technical field of low - voltage power acquisition and communication, and specifically belongs to a line loss troubleshooting device with a household - transformer identification function. Background Art

[0002] With the popularization and improvement of the household - transformer identification technology, in order to build a complete household - transformer identification network, a stable characteristic signal transmitter is crucial.

[0003] At present, most of the household - transformer identification signal transmitters are based on electric meters, using the carrier channel as the uplink communication. This also makes the household - transformer identification start signal of the upper - level device affected by the power network. Especially between two back - to - back substations, there will be phenomena of mis - transmission and mis - identification. Therefore, a transmission device that can stably receive the instructions of the upper - level device and has extremely high controllable stability is needed. Summary of the Invention

[0004] The present invention aims at the deficiencies and defects existing in the prior art, and provides a line loss troubleshooting device with a household - transformer identification function.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A line loss troubleshooting device with a household - transformer identification function includes a remote communication module, a main board of the line loss troubleshooting device, and a household - transformer identification sending module, where:

[0007] The remote communication module is used to communicate with the master station and transfer the interactive information to the main board; in the new household - transformer identification network structure, the household - transformer identification start command issued by the master station is received by the remote communication module, and it is also responsible for transferring the confirmation instruction replied by the main board to the master station to determine the start of the entire household - transformer identification process.

[0008] The main board of the line loss troubleshooting device is mainly responsible for information processing. After receiving the household - transformer identification start command sent by the remote communication module, it will issue a special control command to the household - transformer identification sending module, and then send a confirmation instruction to the remote communication module to reply to the master station.

[0009] The household - transformer identification sending module is responsible for converting the control command sent by the main board into a household - transformer identification characteristic signal and switching it to the power line network. Brief Description of the Drawings

[0010] Figure 1 The following shows the working relationship structure block diagram of the present invention.

[0011] Figure 2 The following shows the schematic diagram of the household - transformer identification module of the present invention. Detailed Embodiment

[0012] In order to enable those skilled in the art to better understand the present invention and make the above-mentioned objects, features and advantages of the present invention more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is only for illustration and not for limiting the present invention.

[0013] Figure 1 The following shows the working relationship structure block diagram of the present invention. The remote communication module transmits the interactive information to the main board of the line loss detection device; then the main board of the line loss detection device issues a special control command, specifically in the form of a PWM wave, and at the same time, it will also send a confirmation instruction to the remote communication module, and the remote communication module will reply the confirmation instruction to the master station; after receiving the control command sent by the main board, the user-transformer identification sending module will convert it into a user-transformer identification characteristic signal and switch it to the power line network.

[0014] Figure 2The schematic diagram of the household-transformer identification module of the present invention is shown. The sending circuit of the household-transformer identification sending module is directly connected to the high-voltage line. After full-wave rectification by VD2, VD3, VD4, and VD5, a half-wave high-voltage direct current is formed in the VIN network after passing through R12, R13, R14, and R15; two varistors RV1 and RV2 are used for overvoltage protection; R12, R13, R14, and R15 are used as load resistors, which determine the intensity of the characteristic current signal; the high-voltage direct current of IN is clamped by VD1 and divided by the resistors R1-R4 to provide a fixed voltage to the gate of VT1. After the voltage meets the turn-on voltage of the MOS transistor VT1, the MOS transistor conducts, and the VIN network charges the capacitor C3 on the VCC network through the lines of R5-R9 to obtain a low-voltage direct current VCC; the PWM control signal is coupled to the gate of VT2 through the DC-blocking capacitor C2. R16 gives the gate of the MOS transistor a low-level initial state to ensure that it will not be mis-conducted; when the PWM control signal is input, C2 removes the DC component, leaving the driving logic of high and low level switching. The MOS transistor will switch its on-off state according to the logic, causing the optocoupler 01 to switch its on-off state. R17 is for current limiting to ensure the driving ability of the optocoupler. When the PWM stops outputting, the charge on C2 is discharged through R6 and returns to the initial state; the function of the diode VD6 is to limit the negative level to -0.2V to prevent excessive negative voltage from damaging the circuit; when the optocoupler conducts, the triode VT3 conducts and VT4 turns off. The level at point A is high. After passing through R21, VT2 conducts, causing the load to be switched to the power network and generating current; when the optocoupler turns off, the triode VT4 conducts and VT3 turns off. The charge on the parasitic capacitor Cgs of the MOS transistor VT2 is discharged through R21, R20, VD8, and VT4, accelerating the voltage drop speed at point B and enabling VT2 to turn off quickly, removing the load from the power network and no longer generating current; among them, VD8 and R20 are discharge circuits added to increase the charge discharge speed. R22 gives the gate of the MOS transistor a low-level initial state to ensure that it will not be mis-conducted. The function of VD7 is to clamp the gate voltage to avoid high-voltage breakdown and damage to VT2.

[0015] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A line loss troubleshooting device with household change recognition function, characterized in that, It includes a remote communication module, a main board of the line loss troubleshooting device, and a household transformer identification and sending module; The connection relationship is as follows: The remote communication module communicates with the main board of the line loss troubleshooting device through a serial port. The main board of the line loss troubleshooting device is connected to the household transformer identification and sending module to control the household transformer identification and sending module with a PWM wave; The household transformer identification and sending module is connected to the power line to inject the characteristic signal into the power network.

2. The line loss troubleshooting device with household change recognition function according to claim 1, characterized in that, The remote communication module transmits the interactive information to the main board of the line loss troubleshooting device; then the main board of the line loss troubleshooting device issues a special control command, specifically in the form of a PWM wave. At the same time, it also sends a confirmation instruction to the remote communication module, and the remote communication module replies the confirmation instruction to the master station; After receiving the control command sent by the main board, the household transformer identification and sending module converts it into a household transformer identification characteristic signal and injects it into the power line network.

3. The line loss troubleshooting device with household change recognition function according to claim 1, characterized in that, The sending circuit of the household transformer identification and sending module is directly connected to the high-voltage power line. After full-wave rectification by VD2, VD3, VD4, and VD5, a half-wave high-voltage direct current is formed in the VIN network after passing through R12, R13, R14, and R15; RV1 and RV2 are varistors for overvoltage protection; R12, R13, R14, and R15 are load resistors that determine the intensity of the characteristic current signal; the high-voltage direct current of IN is clamped by VD1 and divided by the resistors R1 - R4 to provide a fixed voltage for the gate of VT1. When the voltage meets the turn-on voltage of MOS transistor VT1, the MOS transistor conducts, and the VIN network charges the capacitor C3 on the VCC network through the circuit of R5 - R9 to obtain a low-voltage direct current VCC; the PWM control signal is coupled to the gate of VT2 through the DC-blocking capacitor C2. R16 gives a low-level initial state to the gate of the MOS transistor to ensure that it will not be mis-conducted; when the PWM control signal is input, C2 removes the DC component, leaving the drive logic of high and low level switching. The MOS transistor will switch its on-off state according to the logic, causing the optocoupler 01 to switch its on-off state. R17 is for current limiting to ensure the driving ability of the optocoupler. When the PWM stops outputting, the charge on C2 is discharged through R6 and returns to the initial state; the function of diode VD6 is to limit the negative level to -0.2V to prevent excessive negative voltage from damaging the circuit; when the optocoupler conducts, the triode VT3 conducts and VT4 turns off. The level at point A is high. After passing through R21, VT2 conducts, enabling the load to be switched to the power network and generating current; when the optocoupler turns off, the triode VT4 conducts and VT3 turns off. The charge on the parasitic capacitance Cgs of MOS transistor VT2 is discharged through R21, R20, VD8, and VT4, accelerating the voltage drop speed at point B, enabling VT2 to turn off quickly, and removing the load from the power network and no longer generating current; among them, VD8 and R20 are discharge circuits added to increase the charge discharge speed. R22 gives a low-level initial state to the gate of the MOS transistor to ensure that it will not be mis-conducted. The function of VD7 is to clamp the gate voltage to avoid high-voltage breakdown and damage to VT2.

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