Arbitrary residual voltage amplitude recording module for distribution automation terminal

Abstract

The invention 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 output end of the impedance isolation module is electrically connected with the input end of a signal amplification module, the output end of the signal amplification module is electrically connected with the input end of a bidirectional quick interrupt awakening module and the input end of a processor, and the output end of a double-threshold threshold value generation module is electrically connected with the input end of the bidirectional quick interrupt awakening module. The output end of the bidirectional quick interrupt wakeup 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, and the output end of the processor is connected with a distribution network remote signaling terminal. The technical problems that when the residual voltage is too low, an existing residual voltage module cannot accurately record the residual voltage, and the residual voltage threshold is fixed and cannot be freely set are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution automation terminals, and in particular to an arbitrary residual voltage amplitude recording module for distribution automation terminals. Background Art

[0002] The distribution automation terminal is a general term for various remote monitoring and control units installed in the distribution network, which completes functions such as data collection, control and communication, and mainly includes feeder terminals, station terminals, distribution transformer terminals, etc. The patent document with application number CN109842211A discloses a residual voltage recording module and a residual voltage detection method for a reclosing feeder terminal, which involves the field of power detection equipment, including a rectifier module, a current limiting resistor, an energy storage capacitor, a freewheeling diode, a clamping diode, a bistable relay, and a voltage single pulse holding module. When there is residual voltage in the distribution line, the residual voltage event recording module records and maintains the residual voltage event. After the feeder terminal operates normally, the residual voltage event recording module status information is first detected to judge the residual voltage fault, and the corresponding action is performed to isolate the fault area. The residual voltage recording module uses all passive devices, has a short action time, and can record residual voltage events. The feeder terminal can accurately judge the fault location based on the information of the residual voltage recording module, isolate the fault line, and ensure the power supply of the normal line. The existing technology has the problem that when the residual voltage is too low, the module cannot obtain enough energy to drive the module and relay to jump, so it cannot accurately record the residual voltage, and the residual voltage threshold is fixed and cannot be freely set, which is not flexible enough to use. The residual voltage module has a long action time and cannot be used in the case of matching high-speed circuit breakers such as magnetic switches. Since energy needs to be obtained on the sampling circuit, it cannot be used with electronic transformers. Therefore, it is urgent to propose an arbitrary residual voltage amplitude recording module for distribution automation terminals 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. Summary of the invention

[0003] The main purpose of the present invention is to propose an arbitrary residual voltage amplitude recording module for distribution automation terminals, aiming 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 object, the present invention provides an arbitrary residual voltage amplitude recording module for a distribution automation terminal, wherein the arbitrary residual voltage amplitude recording module for a distribution automation terminal comprises:

[0005] An impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a dual-threshold threshold value generating module and a processor; the output end of the impedance isolation module is electrically connected to the input end of the signal amplification module, the output end of the signal amplification module is electrically connected to the input end of the bidirectional fast interrupt wake-up module and the input end of the processor respectively, the output end of the dual-threshold threshold value generating module is electrically connected to the input end of the bidirectional fast interrupt wake-up module, and the output end of the bidirectional fast interrupt wake-up module is electrically connected to the input end of the processor; the input end of the impedance isolation module is connected to a voltage transformer, and the output end of the processor is connected to a distribution network remote signaling terminal.

[0006] In one preferred embodiment, the dual threshold value generating module includes a diode D33, a voltage reference chip U7, a first filtering circuit, a voltage divider circuit, a voltage follower U29, a voltage follower U33, an adding circuit and a subtracting circuit; the anode of the diode D33 is connected to the power supply terminal, the cathode of the diode D33 is respectively connected to the 1 pin of the voltage reference chip U7 and the first filtering circuit, the 2 pins of the voltage reference chip U7 are respectively connected to the signal amplification circuit, the voltage divider circuit and the first filtering circuit, the voltage divider circuit is respectively connected to the voltage follower U2 Pin 3 of 9 is connected to pin 3 of voltage follower U33, pins 1 and 4 of the voltage follower U29 are connected to the subtraction circuit, and the subtraction circuit is connected to the bidirectional fast interrupt wake-up module, pins 1 and 4 of the voltage follower U29 are connected to the addition circuit, and the addition circuit is connected to the bidirectional fast interrupt wake-up module, pin 5 of the voltage follower U29 and pin 5 of the voltage follower U33 are connected to the power supply terminal, pin 2 of the voltage follower U29, pin 2 of the voltage follower U33, the first filtering circuit and the voltage divider circuit are grounded.

[0007] One of the preferred schemes, the first filtering circuit includes capacitor C81, capacitor C13 and capacitor C40; one end of the capacitor C81 is respectively connected to pins 1 and 3 of the voltage reference chip U7, one end of the capacitor C13 is connected to pin 2 of the voltage reference chip U7, one end of the capacitor C40 is connected to the voltage divider circuit, and the other ends of the capacitor C81, capacitor C13 and capacitor C40 are grounded.

[0008] One of the preferred schemes, the voltage divider circuit includes resistor R25, resistor R28, resistor R66 and resistor R127; one end of the resistor R25 is connected to pin 2 of the voltage reference chip U7, the other end of the resistor R25 is respectively connected to resistor R28, the first filter circuit, pin 3 of the voltage follower U33 and pin 3 of the voltage follower U29, the other end of the resistor R28 is connected to resistor R66, the other end of the resistor R66 is connected to resistor R127, and the other end of the resistor R127 is grounded.

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

[0010] One of the preferred schemes, the subtraction circuit includes an operational amplifier U30, a resistor R67, a resistor R68, a resistor R69, a resistor R70 and a capacitor C39; pin 1 of the operational amplifier U30 is respectively connected to the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module, pin 3 of the operational amplifier U30 is respectively connected to the resistor R68 and the resistor R69, the other end of the resistor R68 is connected to the signal amplification module, pin 4 of the operational amplifier U3 is connected to the other end of the resistor R67 and the resistor R70, the other end of the resistor R67 is connected to pin 1 of the voltage follower U29, and pin 5 of the operational amplifier U30 is connected to the power supply end; pin 2 of the operational amplifier U30, the resistor R69 and the other end of the capacitor C39 are grounded.

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

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

[0013] In one of the preferred schemes, the second filtering circuit includes a resistor R48 and a capacitor C72; one end of the resistor R48 is connected to pin 1 of the operational amplifier U26, the other end of the resistor R48 is respectively connected to the capacitor C72 and the bidirectional fast interrupt wake-up module, and the other end of the capacitor C72 is grounded.

[0014] One of the preferred solutions, the bidirectional fast interrupt wake-up module includes 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; pin 1 of the comparator U12 is connected to the anode of the diode V48, pin 3 of the comparator U12 is connected to the resistor R60, the other end of the resistor R60 is connected to the dual threshold value generating module, pin 4 of the comparator U12 is connected to the resistor R55, the other end of the resistor R55 is respectively connected to the signal amplification module and the processor; pin 1 of the comparator U13 is connected to the anode of the diode V47, pin 3 of the comparator U13 is connected to the resistor R54, the resistor R54 The other end of the comparator U13 is connected to the signal amplification module and the processor, the 4th pin of the comparator U13 is connected to the resistor R59, and the other end of the resistor R59 is connected to the dual threshold value generating module; the cathode of the diode V47 and the pin of the diode V48 are connected to the resistor R92, the other end of the resistor R92 is respectively connected to the resistor R93, the resistor R94 and the gate of the MOS tube V9, the drain of the MOS tube V9 is respectively connected to the other end of the resistor R93, the resistor R91 and the resistor R90, the 5th pin of the comparator U13, the 5th pin of the comparator U12 and the other end of the resistor R91 are connected to the power supply end, the other end of the resistor R90 is respectively connected to the processor and the capacitor C73, the 2nd pin of the comparator U13, the 2nd pin 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 above technical solution of the present invention, the arbitrary residual voltage amplitude recording module for the distribution automation terminal includes: an impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a dual threshold value generating module and a processor; the output end of the impedance isolation module is electrically connected to the input end of the signal amplification module, the output end of the signal amplification module is electrically connected to the input end of the bidirectional fast interrupt wake-up module and the input end of the processor respectively, the output end of the dual threshold value generating module is electrically connected to the input end of the bidirectional fast interrupt wake-up module, and the output end of the bidirectional fast interrupt wake-up module is electrically connected to the input end of the processor; the input end of the impedance isolation module is connected to the voltage transformer, and the output end of the processor is connected to the distribution network remote signaling terminal. The present invention solves 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.

[0016] In the present invention, a reference signal is generated by a voltage reference chip U7 in a dual threshold value generating module, and the reference chip is input to a subtraction circuit and an addition circuit respectively through a voltage follower U29 and a voltage follower U33, and the objects to be added and subtracted are both the reference signal generated by the voltage reference chip U7, thereby outputting two threshold voltages respectively through the addition circuit and the subtraction circuit, and the threshold voltage is a symmetrical dual threshold value.

[0017] In the present invention, the two threshold voltages output by the dual threshold value generating module are respectively input to the bidirectional fast interrupt wake-up module. Since the output model of the mutual inductor is a standard 50Hz sinusoidal signal, when the positive half-wave voltage is greater than the threshold voltage output by the addition circuit, the comparator U13 outputs a high level to drive the MOS tube V9 to turn on, triggering an interrupt signal, and waking up the processor to perform ADC sampling and residual voltage judgment; when the negative half-wave voltage is less than the threshold voltage output by the subtraction circuit, the comparator U12 outputs a high level to drive the MOS tube V9 to turn on, triggering an interrupt signal, and waking up the processor to perform ADC sampling and residual voltage judgment, so that no matter at which angle the residual voltage mutation occurs, the interrupt wake-up processor can be quickly realized and the signal can be sampled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of an arbitrary residual voltage amplitude recording module for a distribution automation terminal according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of a dual-threshold value generating module according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of an impedance isolation module, a signal amplification module and a bidirectional fast interrupt wake-up module according to an embodiment of the present invention;

[0022] Figure 4 FIG. 4 is a schematic diagram of a processor according to an embodiment of the present invention.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0026] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] See also Figure 1-Figure 3 According to one aspect of the present invention, the present invention provides an arbitrary residual voltage amplitude recording module for distribution automation terminals, wherein the arbitrary residual voltage amplitude recording module for distribution automation terminals includes: an impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a dual threshold value generation module and a processor; the output end of the impedance isolation module is electrically connected to the input end of the signal amplification module, the output end of the signal amplification module is electrically connected to the input end of the bidirectional fast interrupt wake-up module and the input end of the processor respectively, the output end of the dual threshold value generation module is electrically connected to the input end of the bidirectional fast interrupt wake-up module, and the output end of the bidirectional fast interrupt wake-up module is electrically connected to the input end of the processor; the input end of the impedance isolation module is connected to a voltage transformer, and the output end of the processor is connected to a distribution network remote signaling terminal.

[0028] Specifically, in this embodiment, the dual threshold value generating module includes a diode D33, a voltage reference chip U7, a first filtering circuit, a voltage divider circuit, a voltage follower U29, a voltage follower U33, an adding circuit and a subtracting circuit; the anode of the diode D33 is connected to the power supply end, the cathode of the diode D33 is respectively connected to pin 1 of the voltage reference chip U7 and the first filtering circuit, pin 2 of the voltage reference chip U7 is respectively connected to the signal amplification circuit, the voltage divider circuit and the first filtering circuit, the voltage divider circuit is respectively connected to pin 3 of the voltage follower U29 and pin 3 of the voltage follower U33, pins 1 and 4 of the voltage follower U29 are connected to the subtraction circuit, the subtraction circuit is connected to the bidirectional fast interrupt wake-up module, pins 1 and 4 of the voltage follower U29 are connected to the adding circuit, the adding circuit is connected to the bidirectional fast interrupt wake-up module, pins 5 of the voltage follower U29 and pin 5 of the voltage follower U33 are connected to the power supply. The two ends are connected, and the 2nd pin of the voltage follower U29, the 2nd pin of the voltage follower U33, the first filtering circuit and the voltage divider circuit are grounded; the system voltage, that is, the power supply end 3.1V generates a 1.263V first reference signal through the voltage reference chip U7, and the first reference signal has an accuracy of 0.2%. After the voltage is divided by the voltage divider circuit, a 0.1V second reference signal is generated, and the 0.1V second reference signal is respectively connected to the voltage follower U29 and the voltage follower U33, and the voltage follower U29 and the voltage follower U33 are used to improve the carrying energy and anti-interference ability of the second reference signal; the 0.1V second reference signals output by the voltage follower U29 and the voltage follower U33 are respectively connected to the addition circuit and the subtraction circuit, and the objects to be added and subtracted are all the first reference signals. The addition circuit and the subtraction circuit respectively output a first threshold voltage of 1.363V and a second threshold voltage of 1.163V, thereby generating a symmetrical double threshold value.

[0029] Specifically, in this embodiment, the first filtering circuit includes capacitor C81, capacitor C13 and capacitor C40; one end of the capacitor C81 is respectively connected to pins 1 and 3 of the voltage reference chip U7, one end of the capacitor C13 is connected to pin 2 of the voltage reference chip U7, one end of the capacitor C40 is connected to the voltage divider circuit, and the other ends of the capacitor C81, capacitor C13 and capacitor C40 are grounded.

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

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

[0032] Specifically, in this 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; pin 1 of the operational amplifier U30 is respectively connected to the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module, pin 3 of the operational amplifier U30 is respectively connected to the resistor R68 and the resistor R69, the other end of the resistor R68 is connected to the signal amplification module, pin 4 of the operational amplifier U3 is connected to the other end of the resistor R67 and the resistor R70, the other end of the resistor R67 is connected to pin 1 of the voltage follower U29, and pin 5 of the operational amplifier U30 is connected to the power supply end; 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 to process the input first reference signal to obtain a second threshold voltage of 1.163V.

[0033] Specifically, in this embodiment, the impedance isolation module includes capacitor C1 and capacitor C2; one end of the capacitor C1 and capacitor C2 is connected to the output end of the voltage transformer, and the other end of the capacitor C1 and capacitor C2 is connected to the signal amplification module; the sampling voltage transformer outputs Vab+ and Vab- in the power distribution are sent to the signal amplification module through capacitor C1 and capacitor C2, and the impedance isolation module is used to isolate the DC signal and increase the input impedance of the module at the same time, reducing interference to the sampling circuit of the distribution terminal, so that the sampling voltage transformer of the distribution terminal can be an electromagnetic transformer or an electronic transformer, and there is no need to limit the voltage transformer.

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

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

[0036] Specifically, in this embodiment, the bidirectional fast interrupt wake-up module includes 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 to the anode of the diode V48, a pin 3 of the comparator U12 is connected to the resistor R60, the other end of the resistor R60 is connected to the dual threshold value generating module, a pin 4 of the comparator U12 is connected to the resistor R55, and the other end of the resistor R55 is respectively connected to the signal The amplification module is connected to the processor; the 1 pin of the comparator U13 is connected to the anode of the diode V47, the 3 pin of the comparator U13 is connected to the resistor R54, the other end of the resistor R54 is connected to the signal amplification module and the processor, the 4 pin of the comparator U13 is connected to the resistor R59, and the other end of the resistor R59 is connected to the dual threshold value generation module; the cathode of the diode V47 and the pin of the diode V48 are connected to the resistor R92, the other end of the resistor R92 is respectively connected to the resistor R93, the resistor R94 and the gate of the MOS tube V9, the drain of the MOS tube V9 is respectively connected to the other end of the resistor R93, the resistor R91 and the resistor R 90 is connected, the 5th pin of the comparator U13, the 5th pin of the comparator U12 and the other end of the resistor R91 are connected to the power supply end, the other end of the resistor R90 is respectively connected to the processor and the capacitor C73, the 2nd pin of the comparator U13, the 2nd pin of the comparator U12, the source of the MOS tube V9, the resistor R94, and the other end of the capacitor C73 are grounded; the input end of the bidirectional fast interrupt wake-up module receives the first threshold voltage and the second threshold voltage output by the addition circuit and the subtraction circuit. In the present invention, the first threshold voltage is 1.363V and the second threshold voltage is 1.163V. The present invention does not make specific limitations and can be set as needed; due to The signal output by the transformer is a standard 50Hz sinusoidal 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 turn on, triggering an interrupt signal to wake up the processor for 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 turn on, triggering an interrupt signal to wake up the processor for ADC sampling and residual voltage judgment. Therefore, no matter at which angle the residual voltage mutation occurs, the interrupt wake-up processor can be quickly realized and the signal can be sampled. The slowest time does not exceed 5mS, which can be applied to primary and secondary deep fusion magnetically controlled fast-acting switches with a gate opening time of less than 10mS.

[0037] Specifically, in this embodiment, see Figure 4It is a low-power processor of the present invention, which is used to sample and record the residual voltage amplitude recording module. Usually, the processor is in a deep sleep state, the power consumption of the entire module is less than 50uA, and a 4.5Ah lithium-ion battery is used as a backup power supply. A single battery can support the operation of the module for not less than 8 years; when the CY_INT pin is pulled low to generate an interrupt signal, the processor U31 is immediately awakened for sampling, and the size of the residual value is determined to determine whether it exceeds the set value, so as to make a correct record. The set value can be set, and any residual voltage threshold can be set; after the distribution terminal is powered on again, the residual voltage data is sent to the distribution terminal for locking judgment.

[0038] Specifically, in this embodiment, the residual voltage amplitude recording module of the present invention is suitable for line fault types that vary and need to be a distribution line with three or more levels of line protection. The residual voltage amplitude recording module is powered by a disposable lithium battery and adopts low-power design technology. It can work for more than eight years using a backup battery alone. At the same time, it has the function of drawing power from the distribution terminal, which further improves the working life of the module. With the promotion of deep integration of electronic transformer pole-mounted circuit breakers, since electronic transformers can only provide uA-level current signals, traditional residual modules that drive relay flipping through transformers are no longer applicable. The arbitrary voltage amplitude high-speed and low-power residual voltage recording module used for distribution automation terminals no longer removes power from the transformer, but only collects signals, so it can also be applied to deep integration systems.

[0039] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An arbitrary residual voltage amplitude recording module for a distribution automation terminal, characterized in that: include: An impedance isolation module, a signal amplification module, a bidirectional fast interrupt wake-up module, a dual-threshold threshold value generating module and a processor; the output end of the impedance isolation module is electrically connected to the input end of the signal amplification module, the output end of the signal amplification module is electrically connected to the input end of the bidirectional fast interrupt wake-up module and the input end of the processor respectively, the output end of the dual-threshold threshold value generating module is electrically connected to the input end of the bidirectional fast interrupt wake-up module, and the output end of the bidirectional fast interrupt wake-up module is electrically connected to the input end of the processor; the input end of the impedance isolation module is connected to a voltage transformer, and the output end of the processor is connected to a distribution network remote signaling terminal.

2. The arbitrary residual voltage amplitude recording module for distribution automation terminal according to claim 1, characterized in that: The dual threshold value generating module includes a diode D33, a voltage reference chip U7, a first filtering circuit, a voltage divider circuit, a voltage follower U29, a voltage follower U33, an adding circuit and a subtracting circuit; the anode of the diode D33 is connected to the power supply end, the cathode of the diode D33 is respectively connected to the 1 pin of the voltage reference chip U7 and the first filtering circuit, the 2 pins of the voltage reference chip U7 are respectively connected to the signal amplifying circuit, the voltage divider circuit and the first filtering circuit, the voltage divider circuit is respectively connected to the 3 pins of the voltage follower U29 The first pin of the voltage follower U29 is connected to the pin 3 of the voltage follower U33, the pins 1 and 4 of the voltage follower U29 are connected to the subtraction circuit, the subtraction circuit is connected to the bidirectional fast interrupt wake-up module, the pins 1 and 4 of the voltage follower U29 are connected to the addition circuit, the addition circuit is connected to the bidirectional fast interrupt wake-up module, the pin 5 of the voltage follower U29 and the pin 5 of the voltage follower U33 are connected to the power supply terminal, the pin 2 of the voltage follower U29, the pin 2 of the voltage follower U33, the first filtering circuit and the voltage divider circuit are grounded.

3. The arbitrary residual voltage amplitude recording module for distribution automation terminal according to claim 2, characterized in that: The first filtering circuit includes capacitor C81, capacitor C13 and capacitor C40; one end of the capacitor C81 is respectively connected to pins 1 and 3 of the voltage reference chip U7, one end of the capacitor C13 is connected to pin 2 of the voltage reference chip U7, one end of the capacitor C40 is connected to the voltage divider circuit, and the other ends of the capacitor C81, capacitor C13 and capacitor C40 are grounded.

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

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

6. The arbitrary residual voltage amplitude recording module for distribution automation terminal according to claim 2, characterized in that: The subtraction circuit includes an operational amplifier U30, a resistor R67, a resistor R68, a resistor R69, a resistor R70 and a capacitor C39; pin 1 of the operational amplifier U30 is respectively connected to the resistor R70, the capacitor C39 and the bidirectional fast interrupt wake-up module, pin 3 of the operational amplifier U30 is respectively connected to the resistor R68 and the resistor R69, the other end of the resistor R68 is connected to the signal amplification module, pin 4 of the operational amplifier U3 is connected to the other end of the resistor R67 and the resistor R70, the other end of the resistor R67 is connected to pin 1 of the voltage follower U29, and pin 5 of the operational amplifier U30 is connected to the power supply end; pin 2 of the operational amplifier U30, the resistor R69 and the other end of the capacitor C39 are grounded.

7. An arbitrary residual voltage amplitude recording module for a distribution automation terminal according to any one of claims 1 to 6, characterized in that: The impedance isolation module includes a capacitor C1 and a capacitor C2; one end of the capacitor C1 and the capacitor C2 is connected to the output end of the voltage transformer, and the other end of the capacitor C1 and the capacitor C2 is connected to the signal amplification module.

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

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

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

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