Arbitrary residual voltage amplitude recording module for distribution automation terminal

Abstract

The utility model discloses an arbitrary residual voltage amplitude recording module for a power distribution automation terminal. The arbitrary residual voltage amplitude recording module comprises an impedance isolation module, a signal amplification module, a bidirectional rapid interrupt wake-up module, a double-threshold threshold generation module and a processor, the impedance isolation module is connected with the signal amplification module, the signal amplification module is respectively connected with the bidirectional quick interrupt wake-up module and the processor, the double-threshold threshold value generation module is connected with the bidirectional quick interrupt wake-up module, and the bidirectional quick interrupt wake-up module is connected with the processor. The residual voltage module solves the technical problems that an existing residual voltage module cannot accurately record the residual voltage when the residual voltage is too low, and the residual voltage threshold is fixed and cannot be freely set.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power distribution automation terminal, especially relates to a residual voltage amplitude recording module for power distribution automation terminal. BACKGROUND

[0002] The power distribution automation terminal is the general term of various remote monitoring and control units installed in the power distribution network, which completes data acquisition, control and communication functions, mainly including feeder terminal, station terminal, distribution transformer terminal and the like. The patent document with the application number CN109842211A discloses a residual voltage recording module and a residual voltage detection method of a reclosing feeder terminal, relates to the field of power detection equipment, and comprises a rectifying module, a current limiting resistor, an energy storage capacitor, a freewheeling diode, a clamping diode, a bistable relay, a voltage single-pulse holding module, when residual voltage exists in the power distribution line, the residual voltage event recording module records the residual voltage event and holds, after the feeder terminal normally operates, first detects residual voltage event recording module state information to make residual voltage fault judgment, executes corresponding action, isolates the fault area, all residual voltage recording modules adopt passive devices, the action time is short, residual voltage events can be recorded, the feeder terminal can accurately judge the fault position according to the information of the residual voltage recording module, isolates the fault line, and ensures the power supply of the normal line. The prior art has the problems that when the residual voltage is too low, the module cannot obtain enough energy to drive the module and the relay to jump, so that the residual voltage cannot be accurately recorded, the residual voltage threshold is fixed and cannot be freely set, the use is not flexible enough, the residual voltage module action time is long, and the residual voltage module cannot be used in the case of a matched magnetic control switch or the like high-speed circuit breaker. Therefore, the residual voltage module cannot accurately record the residual voltage when the residual voltage is too low, and the residual voltage threshold is fixed and cannot be freely set. Therefore, an arbitrary residual voltage amplitude recording module for power distribution automation terminal is urgently needed to solve the technical problems that the existing residual voltage module cannot accurately record the residual voltage when the residual voltage is too low and the residual voltage threshold is fixed and cannot be freely set. UTILITY MODEL CONTENTS

[0003] The main purpose of the utility model is to provide an arbitrary residual voltage amplitude recording module for power distribution automation terminal, which aims to solve the technical problems that the existing residual voltage module cannot accurately record the residual voltage when the residual voltage is too low and the residual voltage threshold is fixed and cannot be freely set.

[0004] To achieve the above-mentioned purpose, the utility model provides an arbitrary residual voltage amplitude recording module for power distribution automation terminal, wherein the arbitrary residual voltage amplitude recording module for power distribution automation terminal comprises:

[0005] Impedance isolation module, signal amplification module, bidirectional fast interrupt wake-up module, double threshold value generation module and processor; the impedance isolation module is connected with the signal amplification module, the signal amplification module is connected with the bidirectional fast interrupt wake-up module and the processor respectively, the double threshold value generation module is connected with the bidirectional fast interrupt wake-up module, and the bidirectional fast interrupt wake-up module is connected with the processor.

[0006] In one preferred scheme, the double threshold value generation module comprises a diode D33, a voltage reference chip U7, a first filter circuit, a voltage dividing circuit, a voltage follower U29, a voltage follower U33, an addition circuit and a subtraction circuit; the anode of the diode D33 is connected with a power supply end, the cathode of the diode D33 is connected with a 1 pin of the voltage reference chip U7 and the first filter circuit respectively, a 2 pin of the voltage reference chip U7 is connected with the signal amplification circuit, the voltage dividing circuit and the first filter circuit respectively, the voltage dividing circuit is connected with a 3 pin of the voltage follower U29 and a 3 pin of the voltage follower U33 respectively, 1 and 4 pins of the voltage follower U29 are connected with the subtraction circuit, the subtraction circuit is connected with the bidirectional fast interrupt wake-up module, 1 and 4 pins of the voltage follower U29 are connected with the addition circuit, the addition circuit is connected with the bidirectional fast interrupt wake-up module, a 5 pin of the voltage follower U29 and a 5 pin of the voltage follower U33 are connected with the power supply end, a 2 pin of the voltage follower U29, a 2 pin of the voltage follower U33, the first filter circuit and the voltage dividing circuit are grounded.

[0007] In one preferred scheme, the first filter circuit comprises a capacitor C81, a capacitor C13 and a capacitor C40; one end of the capacitor C81 is connected with a 1 and a 3 pin of the voltage reference chip U7 respectively, one end of the capacitor C13 is connected with a 2 pin of the voltage reference chip U7, one end of the capacitor C40 is connected with the voltage dividing circuit, the other end of the capacitor C81, the capacitor C13 and the capacitor C40 is grounded.

[0008] In one preferred scheme, the voltage dividing circuit comprises a resistor R25, a resistor R28, a resistor R66 and a resistor R127; one end of the resistor R25 is connected with a 2 pin of the voltage reference chip U7, the other end of the resistor R25 is connected with the resistor R28, the first filter circuit, a 3 pin of the voltage follower U33 and a 3 pin of the voltage follower U29 respectively, the other end of the resistor R28 is connected with the resistor R66, the other end of the resistor R66 is connected with the resistor R127, the other end of the resistor R127 is grounded.

[0009] In one preferred embodiment, the addition circuit includes an operational amplifier U32, a resistor R71, a resistor R72, a resistor R75, a resistor R88 and a capacitor C32; the pin 1 of the operational amplifier U32 is connected with the resistor R88, the capacitor C32 and the bidirectional fast interrupt wake-up module respectively; the pin 3 of the operational amplifier U32 is connected with the resistor R72 and the resistor R75 respectively, the other end of the resistor R75 is connected with the pin 1 of the voltage follower U33, the other end of the resistor R72 is connected with the signal amplification module, the pin 4 of the operational amplifier U32 is connected with the resistor R71 and the other end of the resistor R88 respectively, the pin 2 of the operational amplifier U32, the resistor R71 and the other end of the capacitor C32 are grounded; the pin 5 of the operational amplifier U32 is connected with the power supply end.

[0010] In one preferred embodiment, the subtraction circuit includes an operational amplifier U30, a resistor R67, a resistor R68, a resistor R69, a resistor R70 and a capacitor C39; the pin 1 of the operational amplifier U30 is connected with the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module respectively, the pin 3 of the operational amplifier U30 is connected with the resistor R68 and the resistor R69 respectively, the other end of the resistor R68 is connected with the signal amplification module, the pin 4 of the operational amplifier U30 is connected with the resistor R67 and the other end of the resistor R70, the other end of the resistor R67 is connected with the pin 1 of the voltage follower U29, the pin 5 of the operational amplifier U30 is connected with the power supply end; the pin 2 of the operational amplifier U30, the resistor R69 and the other end of the capacitor C39 are grounded.

[0011] In one preferred embodiment, the impedance isolation module includes a capacitor C1 and a capacitor C2; one end of the capacitor C1 and the capacitor C2 is connected with the output end of the voltage transformer, the other end of the capacitor C1 and the capacitor C2 is connected with the signal amplification module.

[0012] In one preferred embodiment, the signal amplification module includes an operational amplifier U26, a resistor R49, a resistor R50, a resistor R51 and a resistor R53; the pin 1 of the operational amplifier U26 is connected with the resistor R53 and the second filter circuit respectively, the other end of the second filter circuit is connected with the bidirectional fast interrupt wake-up module, the pin 2 of the operational amplifier U26 is grounded, the pin 3 of the operational amplifier U26 is connected with the resistor R50 and the resistor R51 respectively, the other end of the resistor R51 is connected with the double threshold value generation module, the other end of the resistor R50 is connected with the impedance isolation module, the pin 4 of the operational amplifier U26 is connected with the resistor R49 and the other end of the resistor R53 respectively, the other end of the resistor R49 is connected with the impedance isolation module; the pin 5 of the operational amplifier U26 is connected with the power supply end.

[0013] Preferably, the second filter circuit comprises a resistor R48 and a capacitor C72; one end of the resistor R48 is connected with the pin 1 of the operational amplifier U26, the other end of the resistor R48 is connected with the capacitor C72 and the bidirectional fast interrupt wake-up module respectively, and the other end of the capacitor C72 is grounded.

[0014] Preferably, the bidirectional fast interrupt wake-up module comprises a comparator U13, a comparator U12, a resistor R59, a resistor R54, a resistor R55, a resistor R60, a diode V47, a diode V48, a resistor R92, a resistor R93, a resistor R94, a MOS tube V9, a resistor R91, a resistor R90 and a capacitor C73; the pin 1 of the comparator U12 is connected with the anode of the diode V48, the pin 3 of the comparator U12 is connected with the resistor R60, the other end of the resistor R60 is connected with the double threshold value generating module, the pin 4 of the comparator U12 is connected with the resistor R55, and the other end of the resistor R55 is connected with the signal amplification module and the processor respectively; the pin 1 of the comparator U13 is connected with the anode of the diode V47, the pin 3 of the comparator U13 is connected with the resistor R54, the other end of the resistor R54 is connected with the signal amplification module and the processor, the pin 4 of the comparator U13 is connected with the resistor R59, and the other end of the resistor R59 is connected with the double threshold value generating module; the cathode of the diode V47 and the pin of the diode V48 are connected with the resistor R92, the other end of the resistor R92 is connected with the resistor R93, the resistor R94 and the gate of the MOS tube V9 respectively, the drain of the MOS tube V9 is connected with the other end of the resistor R93, the resistor R91 and the resistor R90 respectively, the pin 5 of the comparator U13, the pin 5 of the comparator U12 and the other end of the resistor R91 are connected with the power supply end, the other end of the resistor R90 is connected with the processor and the capacitor C73 respectively, the pin 2 of the comparator U13, the pin 2 of the comparator U12, the source of the MOS tube V9, the resistor R94 and the other end of the capacitor C73 are grounded.

[0015] In the technical scheme, the arbitrary residual voltage amplitude recording module for power distribution automation terminal comprises an impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a double threshold value generating module and a processor, the impedance isolation module is connected with the signal amplification module, the signal amplification module is connected with the bidirectional fast interrupt wake-up module and the processor respectively, the double threshold value generating module is connected with the bidirectional fast interrupt wake-up module, and the bidirectional fast interrupt wake-up module is connected with the processor.

[0016] In the utility model, through voltage reference chip U7 in double threshold value generating module produces reference signal, the reference chip is inputted to subtraction circuit and addition circuit through voltage follower U29 and voltage follower U33 respectively, the object of addition and subtraction is all reference signal produced by voltage reference chip U7, thereby two threshold voltages are outputted through addition circuit and subtraction circuit respectively, the threshold voltage is the symmetric double threshold value.

[0017] In the utility model, two threshold voltages outputted by double threshold value generating module are inputted to bidirectional fast interrupt wake-up module, since the model of mutual inductor output is standard 50Hz sine signal, when positive half wave voltage is greater than the threshold voltage outputted by addition circuit, comparator U13 outputs high level and drives MOS tube V9 to turn on, triggers interrupt signal, wakes up processor to carry out ADC sampling and residual voltage judgment;When negative half wave voltage is less than the threshold voltage outputted by subtraction circuit, comparator U12 outputs high level and drives MOS tube V9 to turn on, triggers interrupt signal, wakes up processor to carry out ADC sampling and residual voltage judgment, so whether residual voltage mutation is produced at any angle, can quickly realize interrupting wake-up processor and carries out signal sampling. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creating labor.

[0019] Figure 1 It is the structure schematic diagram of the arbitrary residual voltage amplitude recording module for power distribution automation terminal of the embodiment of the utility model;

[0020] Figure 2 It is the schematic diagram of the double threshold value generating module of the embodiment of the utility model;

[0021] Figure 3 It is the schematic diagram of the impedance isolation module, signal amplification module and bidirectional fast interrupt wake-up module of the embodiment of the utility model;

[0022] Figure 4 It is the schematic diagram of the processor of the embodiment of the utility model.

[0023] The realization, functional characteristics and advantages of the utility model will be further explained with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0025] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0026] Furthermore, the technical solutions of the various embodiments of the present application can be combined with each other, but must be based on the fact that they can be realized by those of ordinary skill in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0027] Referring to Figures 1-3 According to an aspect of the present application, the present application provides an arbitrary residual voltage amplitude recording module for a power distribution automation terminal, wherein the arbitrary residual voltage amplitude recording module for the power distribution automation terminal comprises an impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a double threshold value generation module and a processor. The output end of the impedance isolation module is electrically connected with the input end of the signal amplification module. The output end of the signal amplification module is electrically connected with the input end of the bidirectional fast interrupt wake-up module and the input end of the processor, respectively. The output end of the double threshold value generation module is electrically connected with the input end of the bidirectional fast interrupt wake-up module. The output end of the bidirectional fast interrupt wake-up module is electrically connected with the input end of the processor. The input end of the impedance isolation module is connected with a voltage transformer. The output end of the processor is connected with a power network remote signaling terminal.

[0028] Specifically, in the embodiment, the double threshold value generating module comprises a diode D33, a voltage reference chip U7, a first filter circuit, a voltage dividing circuit, a voltage follower U29, a voltage follower U33, an addition circuit and a subtraction circuit; an anode of the diode D33 is connected with a power supply end, cathodes of the diode D33 are respectively connected with a 1 pin of the voltage reference chip U7 and the first filter circuit, a 2 pin of the voltage reference chip U7 is respectively connected with a signal amplification circuit, the voltage dividing circuit and the first filter circuit, the voltage dividing circuit is respectively connected with a 3 pin of the voltage follower U29 and a 3 pin of the voltage follower U33, 1 and 4 pins of the voltage follower U29 are connected with the subtraction circuit, the subtraction circuit is connected with the bidirectional fast interrupt wake-up module, 1 and 4 pins of the voltage follower U29 are connected with the addition circuit, the addition circuit is connected with the bidirectional fast interrupt wake-up module, a 5 pin of the voltage follower U29 and a 5 pin of the voltage follower U33 are connected with the power supply end, a 2 pin of the voltage follower U29, a 2 pin of the voltage follower U33, the first filter circuit and the voltage dividing circuit are grounded; a system voltage, i.e. the power supply end 3.1V generates a first reference signal of 1.263V through the voltage reference chip U7, the first reference signal has an accuracy of 0.2%, a second reference signal of 0.1V is generated after voltage division of the first reference signal through the voltage dividing circuit, the second reference signal of 0.1V is respectively connected with the voltage follower U29 and the voltage follower U33, the voltage follower U29 and the voltage follower U33 are used to improve the load capacity and anti-interference ability of the second reference signal; the second reference signal of 0.1V output by the voltage follower U29 and the voltage follower U33 is respectively connected with the addition circuit and the subtraction circuit, the objects to be added and subtracted are all the first reference signal, a first threshold voltage of 1.363V and a second threshold voltage of 1.163V are respectively output through the addition circuit and the subtraction circuit, so that the symmetrical double threshold value is generated.

[0029] Specifically, in the embodiment, the first filter circuit comprises a capacitor C81, a capacitor C13 and a capacitor C40; one end of the capacitor C81 is respectively connected with a 1 and a 3 pin of the voltage reference chip U7, one end of the capacitor C13 is connected with a 2 pin of the voltage reference chip U7, one end of the capacitor C40 is connected with the voltage dividing circuit, the other end of the capacitor C81, the capacitor C13 and the capacitor C40 is grounded.

[0030] Specifically, in the embodiment, the voltage dividing circuit comprises resistors R25, R28, R66 and R127; one end of the resistor R25 is connected with the pin 2 of the voltage reference chip U7, the other end of the resistor R25 is connected with the resistor R28, the first filter circuit, the pin 3 of the voltage follower U33 and the pin 3 of the voltage follower U29 respectively, the other end of the resistor R28 is connected with the resistor R66, the other end of the resistor R66 is connected with the resistor R127, and the other end of the resistor R127 is grounded.

[0031] Specifically, in the embodiment, the addition circuit comprises an operational amplifier U32, resistors R71, R72, R75, R88 and a capacitor C32; the pin 1 of the operational amplifier U32 is connected with the resistor R88, the capacitor C32 and the bidirectional fast interrupt wake-up module respectively, the pin 3 of the operational amplifier U32 is connected with the resistor R72 and the resistor R75 respectively, the other end of the resistor R75 is connected with the pin 1 of the voltage follower U33, the other end of the resistor R72 is connected with the signal amplification module, the pin 4 of the operational amplifier U32 is connected with the resistor R71 and the other end of the resistor R88 respectively, the pin 2 of the operational amplifier U32, the resistor R71 and the other end of the capacitor C32 are grounded; the pin 5 of the operational amplifier U32 is connected with the power supply end, and the addition circuit is used for processing the input first reference signal to obtain a first threshold voltage of 1.363V.

[0032] Specifically, in the embodiment, the subtraction circuit comprises an operational amplifier U30, resistors R67, R68, R69, R70 and a capacitor C39; the pin 1 of the operational amplifier U30 is connected with the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module respectively, the pin 3 of the operational amplifier U30 is connected with the resistor R68 and the resistor R69 respectively, the other end of the resistor R68 is connected with the signal amplification module, the pin 4 of the operational amplifier U30 is connected with the resistor R67 and the other end of the resistor R70, the other end of the resistor R67 is connected with the pin 1 of the voltage follower U29, and the pin 5 of the operational amplifier U30 is connected with the power supply end; the pin 2 of the operational amplifier U30, the resistor R69 and the other end of the capacitor C39 are grounded, and the subtraction circuit is used for processing the input first reference signal to obtain a second threshold voltage of 1.163V.

[0033] Specifically, in the embodiment, the impedance isolation module comprises a capacitor C1 and a capacitor C2; one end of the capacitor C1 and the capacitor C2 is connected with the output end of the voltage transformer, and the other end of the capacitor C1 and the capacitor C2 is connected with the signal amplification module; the sampling voltage transformer output Vab+ and Vab- in power distribution are sent into the signal amplification module through the capacitor C1 and the capacitor C2, the impedance isolation module is used for isolating the direct current signal, increasing the input impedance of the module, reducing the interference to the sampling loop of the power distribution terminal, so that the sampling voltage transformer of the power distribution terminal can be an electromagnetic transformer or an electronic transformer, without limiting the voltage transformer.

[0034] Specifically, in the embodiment, the signal amplification module comprises an operational amplifier U26, a resistor R49, a resistor R50, a resistor R51 and a resistor R53; the 1 pin of the operational amplifier U26 is connected with the resistor R53 and the second filter circuit respectively, the other end of the second filter circuit is connected with the bidirectional fast interrupt wake-up module, the 2 pin of the operational amplifier U26 is grounded, the 3 pin of the operational amplifier U26 is connected with the resistor R50 and the resistor R51 respectively, the other end of the resistor R51 is connected with the double threshold value generation module, the other end of the resistor R50 is connected with the impedance isolation module, the 4 pin of the operational amplifier U26 is connected with the other end of the resistor R49 and the resistor R53 respectively, the other end of the resistor R49 is connected with the impedance isolation module; the 5 pin of the operational amplifier U26 is connected with the power supply end; the resistor R49 and the resistor R53 are amplification proportional resistors, which realize the amplification and conditioning of the signal, and at the same time, the input signal is superimposed with a bias of 1.263V through the resistor R51 at the 3 pin input end of the operational amplifier U26, so that the output signal of the operational amplifier U26 is output based on 1.263V as the reference.

[0035] Specifically, in the embodiment, the second filter circuit comprises a resistor R48 and a capacitor C72; one end of the resistor R48 is connected with the 1 pin of the operational amplifier U26, the other end of the resistor R48 is connected with the capacitor C72 and the bidirectional fast interrupt wake-up module respectively, the other end of the capacitor C72 is grounded, and the second filter circuit is used for filtering the signal output by the signal amplification module for sampling by the back-end processor, and sending the filtered signal to the bidirectional fast interrupt wake-up module with the first threshold voltage and the second threshold voltage as the threshold value.

[0036] Specifically, in the embodiment, the bidirectional fast interrupt wake-up module comprises a comparator U13, a comparator U12, a resistor R59, a resistor R54, a resistor R55, a resistor R60, a diode V47, a diode V48, a resistor R92, a resistor R93, a resistor R94, a MOS tube V9, a resistor R91, a resistor R90 and a capacitor C73; a pin 1 of the comparator U12 is connected with an anode of the diode V48, a pin 3 of the comparator U12 is connected with the resistor R60, the other end of the resistor R60 is connected with a double threshold value generating module, a pin 4 of the comparator U12 is connected with the resistor R55, the other end of the resistor R55 is connected with a signal amplification module and a processor respectively; a pin 1 of the comparator U13 is connected with an anode of the diode V47, a pin 3 of the comparator U13 is connected with the resistor R54, the other end of the resistor R54 is connected with the signal amplification module and the processor, a pin 4 of the comparator U13 is connected with the resistor R59, the other end of the resistor R59 is connected with the double threshold value generating module; a cathode of the diode V47 and a pin of the diode V48 are connected with the resistor R92, the other end of the resistor R92 is connected with the resistor R93, the resistor R94 and a gate of the MOS tube V9 respectively, a drain of the MOS tube V9 is connected with the other end of the resistor R93, the resistor R91 and the resistor R90 respectively, a pin 5 of the comparator U13, a pin 5 of the comparator U12 and the other end of the resistor R91 are connected with a power supply end, the other end of the resistor R90 is connected with the processor and a capacitor C73 respectively, a pin 2 of the comparator U13, a pin 2 of the comparator U12, a source of the MOS tube V9, the resistor R94 and the other end of the capacitor C73 are grounded; an input end of the bidirectional fast interrupt wake-up module receives a first threshold voltage and a second threshold voltage output by an adding circuit and a subtracting circuit, in the utility model, the first threshold voltage is 1.363V, the second threshold voltage is 1.163V, the utility model is not specifically limited, and can be set according to needs; because the signal output by the mutual inductor is a standard 50Hz sine signal, when the positive half-wave voltage is greater than 1.363V, the comparator U13 outputs a high level to drive the MOS tube V9 to be turned on, triggers an interrupt signal, wakes up the processor to carry out ADC sampling and residual voltage judgment; when the negative half-wave voltage is less than 1.163V, the comparator U12 outputs a high level to drive the MOS tube V9 to be turned on, triggers an interrupt signal, wakes up the processor to carry out ADC sampling and residual voltage judgment, so that no matter residual voltage mutation is generated at any angle, the processor can be quickly interrupted and woken up, signal sampling is carried out, and the slowest time is not more than 5mS, and the bidirectional fast interrupt wake-up module can be applied to a primary and secondary deep fusion magnetic control quick-action switch with a switching time less than 10mS.

[0037] Specifically, in the embodiment, referring to Figure 4The processor is used for sampling and residual voltage recording of the residual voltage amplitude recording module, and the processor is usually in a deep sleep state, the entire module has a power consumption less than 50uA, a 4.5Ah lithium battery is used as a backup power supply, and a single battery can support module operation for not less than 8 years; after the CY_INT pin is pulled low to generate an interrupt signal, the processor U31 is immediately woken up to sample, the size of the residual value is judged, whether the residual value exceeds a fixed value, so that correct recording is made, the fixed value can be set, and any residual voltage threshold can be set; after the power distribution terminal is powered on again, residual voltage data is sent to the power distribution terminal for locking judgment.

[0038] Specifically, in the embodiment, the residual voltage amplitude recording module is suitable for various line fault types, needs to make line protection for power distribution lines more than three levels, the residual voltage amplitude recording module adopts a disposable lithium battery power supply, adopts a low-power design technology, and can work for more than eight years by using a backup battery power supply alone, and has the function of taking power from the power distribution terminal, thereby further improving the working life of the module; with the promotion of the deep integration of electronic type current transformers and pole circuit breakers, since the electronic type current transformer can only provide a uA level current signal, the traditional residual module driven by the relay of the transformer has been unable to be applied, and the arbitrary voltage amplitude high-speed low-power residual recording module for the power distribution automation terminal no longer takes power from the transformer, but only collects signals, so that the deep integration system can also be applied.

[0039] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the attached drawings, or direct / indirect application in other related technical fields under the utility model concept of the utility model is included in the patent protection range of the utility model.

Claims

1. An arbitrary residual voltage magnitude recording module for a power distribution automation terminal, characterized by, The application relates to an impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a double-threshold value generation module and a processor. The double-threshold value generation module comprises a diode D33, a voltage reference chip U7, a first filter circuit, a voltage dividing circuit, a voltage follower U29, a voltage follower U33, an addition circuit and a subtraction circuit; the anode of the diode D33 is connected with a power supply end; the cathode of the diode D33 is connected with a 1-pin of the voltage reference chip U7 and the first filter circuit respectively; a 2-pin of the voltage reference chip U7 is connected with a signal amplification circuit, the voltage dividing circuit and the first filter circuit respectively; the voltage dividing circuit is connected with a 3-pin of the voltage follower U29 and a 3-pin of the voltage follower U33 respectively; 1 and 4 pins of the voltage follower U29 are connected with the subtraction circuit; the subtraction circuit is connected with the bidirectional fast interrupt wake-up module; 1 and 4 pins of the voltage follower U29 are connected with the addition circuit; the addition circuit is connected with the bidirectional fast interrupt wake-up module; a 5-pin of the voltage follower U29 and a 5-pin of the voltage follower U33 are connected with the power supply end; a 2-pin of the voltage follower U29, a 2-pin of the voltage follower U33, the first filter circuit and the voltage dividing circuit are grounded.

2. The arbitrary residual voltage amplitude recording module for power distribution automation terminal according to claim 1, characterized in that, The first filter circuit comprises a capacitor C81, a capacitor C13 and a capacitor C40; one end of the capacitor C81 is connected with a 1-pin and a 3-pin of the voltage reference chip U7 respectively; one end of the capacitor C13 is connected with a 2-pin of the voltage reference chip U7; one end of the capacitor C40 is connected with the voltage dividing circuit; the other ends of the capacitor C81, the capacitor C13 and the capacitor C40 are grounded.

3. The arbitrary residual voltage amplitude recording module for a power distribution automation terminal according to claim 2, characterized in that, The voltage dividing circuit comprises a resistor R25, a resistor R28, a resistor R66 and a resistor R127; one end of the resistor R25 is connected with a 2-pin of the voltage reference chip U7; the other end of the resistor R25 is connected with the resistor R28, the first filter circuit, a 3-pin of the voltage follower U33 and a 3-pin of the voltage follower U29 respectively; the other end of the resistor R28 is connected with the resistor R66; the other end of the resistor R66 is connected with the resistor R127; the other end of the resistor R127 is grounded.

4. The arbitrary residual voltage amplitude recording module for power distribution automation terminal according to claim 2, characterized in that, ​ 5. The arbitrary residual voltage amplitude recording module for a power distribution automation terminal according to claim 2, characterized in that, The addition circuit comprises an operational amplifier U32, resistors R71, R72, R75, R88 and a capacitor C32; a pin 1 of the operational amplifier U32 is connected with the resistor R88, the capacitor C32 and the bidirectional fast interrupt wake-up module respectively; a pin 3 of the operational amplifier U32 is connected with the resistor R72 and the resistor R75 respectively, another end of the resistor R75 is connected with a pin 1 of a voltage follower U33, another end of the resistor R72 is connected with the signal amplification module, a pin 4 of the operational amplifier U32 is connected with the resistor R71 and another end of the resistor R88 respectively, a pin 2 of the operational amplifier U32, the resistor R71 and another end of the capacitor C32 are grounded; a pin 5 of the operational amplifier U32 is connected with a power supply end.

6. The arbitrary residual voltage amplitude recording module for a power distribution automation terminal according to claim 2, wherein, The subtraction circuit comprises an operational amplifier U30, resistors R67, R68, R69, R70 and a capacitor C39; a pin 1 of the operational amplifier U30 is connected with the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module respectively, a pin 3 of the operational amplifier U30 is connected with the resistor R68 and the resistor R69 respectively, another end of the resistor R68 is connected with the signal amplification module, a pin 4 of the operational amplifier U30 is connected with the resistor R67 and another end of the resistor R70, another end of the resistor R67 is connected with a pin 1 of a voltage follower U29, a pin 5 of the operational amplifier U30 is connected with a power supply end; a pin 2 of the operational amplifier U30, the resistor R69 and another end of the capacitor C39 are grounded.

7. A residual voltage amplitude recording module for a power distribution automation terminal according to any of claims 1-6, characterized in that, The impedance isolation module comprises capacitors C1 and C2; one end of the capacitors C1 and C2 is connected with an output end of the voltage transformer, another end of the capacitors C1 and C2 is connected with the signal amplification module.

8. A residual voltage amplitude recording module for a power distribution automation terminal according to any one of claims 1-6, characterized in that, The signal amplification module comprises an operational amplifier U26, resistors R49, R50, R51 and R53; a pin 1 of the operational amplifier U26 is connected with the resistor R53 and a second filter circuit respectively, another end of the second filter circuit is connected with the bidirectional fast interrupt wake-up module, a pin 2 of the operational amplifier U26 is grounded, a pin 3 of the operational amplifier U26 is connected with the resistor R50 and the resistor R51 respectively, another end of the resistor R51 is connected with a double threshold value generation module, another end of the resistor R50 is connected with the impedance isolation module, a pin 4 of the operational amplifier U26 is connected with the resistor R49 and another end of the resistor R53 respectively, another end of the resistor R49 is connected with the impedance isolation module; a pin 5 of the operational amplifier U26 is connected with a power supply end.

9. The arbitrary residual voltage amplitude recording module for a power distribution automation terminal according to claim 8, characterized in that, The second filter circuit comprises a resistor R48 and a capacitor C72; one end of the resistor R48 is connected with a pin 1 of the operational amplifier U26, another end of the resistor R48 is connected with the capacitor C72 and the bidirectional fast interrupt wake-up module respectively, another end of the capacitor C72 is grounded.

10. A residual voltage amplitude recording module for a power distribution automation terminal according to any one of claims 1-6, characterized in that, The bidirectional fast interrupt wake-up module comprises a comparator U13, a comparator U12, a resistor R59, a resistor R54, a resistor R55, a resistor R60, a diode V47, a diode V48, a resistor R92, a resistor R93, a resistor R94, a MOS tube V9, a resistor R91, a resistor R90 and a capacitor C73; a 1-pin of the comparator U12 is connected with an anode of the diode V48, a 3-pin of the comparator U12 is connected with the resistor R60, the other end of the resistor R60 is connected with a double-threshold value generation module, a 4-pin of the comparator U12 is connected with the resistor R55, the other end of the resistor R55 is connected with a signal amplification module and a processor respectively; a 1-pin of the comparator U13 is connected with an anode of the diode V47, a 3-pin of the comparator U13 is connected with the resistor R54, the other end of the resistor R54 is connected with the signal amplification module and the processor, a 4-pin of the comparator U13 is connected with the resistor R59, the other end of the resistor R59 is connected with the double-threshold value generation module; a cathode of the diode V47 and a pin of the diode V48 are connected with the resistor R92, the other end of the resistor R92 is connected with the resistor R93, the resistor R94 and a gate of the MOS tube V9 respectively, a drain of the MOS tube V9 is connected with the other end of the resistor R93, the resistor R91 and the resistor R90 respectively, a 5-pin of the comparator U13, a 5-pin of the comparator U12 and the other end of the resistor R91 are connected with a power supply end, the other end of the resistor R90 is connected with the processor and a capacitor C73 respectively, a 2-pin of the comparator U13, a 2-pin of the comparator U12, a source of the MOS tube V9, the resistor R94 and the other end of the capacitor C73 are grounded.

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