阅读说明：本技术 一种避雷器雷击动作的计数电路 (Counting circuit for lightning stroke action of lightning arrester ) 是由 韦海荣 于 2021-08-11 设计创作，主要内容包括：本发明涉及一种避雷器雷击动作的计数电路,包括氧化锌阀片F1、整流桥、电流互感器、反相器U1A、RS锁存器和单片机。氧化锌阀片与避雷器串联,整流桥的输入端与氧化锌阀片并联。电流互感器的原边连接所述整流桥的输出端,电流互感器的副边并接有负载电阻、滤波电容。反相器U1A的第一输入端接高电平,电流互感器副边的信号经滤波稳压处理后得到脉冲电压信号,该信号连接反相器U1A的第二输入端。反相器U1A的输出连接RS锁存器的输入端,RS锁存器的输出端和复位信号端分别接单片机的计数信号输入端和复位信号输出端,当锁存器输出高电平信号被单片机获取后,单片机对雷击动作进行一次计数并对锁存器进行复位。本发明电路易于实现,能够较稳定的对避雷器雷击动作次数进行计数,非常适用于低功耗要求设计。(The invention relates to a counting circuit for lightning stroke actions of a lightning arrester, which comprises a zinc oxide valve plate F1, a rectifier bridge, a current transformer, a phase inverter U1A, an RS latch and a single chip microcomputer. The zinc oxide valve plate is connected with the lightning arrester in series, and the input end of the rectifier bridge is connected with the zinc oxide valve plate in parallel. The primary side of the current transformer is connected with the output end of the rectifier bridge, and the secondary side of the current transformer is connected with a load resistor and a filter capacitor in parallel. The first input end of the inverter U1A is connected with high level, the signal of the secondary side of the current transformer is filtered and stabilized to obtain a pulse voltage signal, and the pulse voltage signal is connected with the second input end of the inverter U1A. The output of phase inverter U1A connects the input of RS latch, and the output and the reset signal end of RS latch connect the count signal input part and the reset signal output part of singlechip respectively, and after the high level signal of latch output was obtained by the singlechip, the singlechip once counted the action of thunderbolt and reset the latch. The circuit is easy to realize, can stably count the lightning stroke action times of the lightning arrester, and is very suitable for the design with low power consumption requirement.)

1. The utility model provides a counting circuit of arrester thunderbolt action, includes zinc oxide valve block, rectifier bridge, current transformer, phase inverter U1A, RS latch and singlechip, the zinc oxide valve block is established ties with the arrester, and the input and the zinc oxide valve block of rectifier bridge are parallelly connected, current transformer's former limit is connected the output of rectifier bridge, its characterized in that: the secondary side of the current transformer is connected with a load resistor R1 and a filter capacitor C1 in parallel, the first input end of a phase inverter U1A is connected with a high level, a signal on the secondary side of the current transformer is filtered and stabilized to obtain a pulse voltage signal, the signal is connected with the second input end of the phase inverter U1A, the output end of the phase inverter U1A is connected with the input end of an RS latch, the output end and the reset signal end of the RS latch are respectively connected with the counting signal input end and the reset signal output end of a single chip microcomputer, and after the high level signal output by the latch is acquired by the single chip microcomputer, the single chip microcomputer counts lightning stroke actions once and resets the latch.

2. The lightning arrester lightning stroke action counting circuit according to claim 1, characterized in that: and the secondary side of the current transformer is also connected with a voltage regulator tube V1 in parallel.

3. The lightning arrester lightning stroke action counting circuit according to claim 2, characterized in that: and the diode D1 is used for filtering negative signals, the anode of the diode D1 is connected with the same-name end of the secondary side of the current transformer, and the cathode of the diode D1 is connected with the cathode of the voltage regulator tube V1.

4. The lightning arrester lightning stroke action counting circuit according to claim 1, characterized in that: the RS latch is triggered by a low level, namely when the input end of the RS latch is at the low level, the RS latch outputs a high level signal.

5. The lightning arrester lightning stroke action counting circuit according to claim 1, characterized in that: the RS latch comprises an inverter U1B and an inverter U1C, a first input end of the inverter U1B is connected with an output end of the inverter U1A, an output end of the inverter U1C is connected with a second input end of the inverter U1B, an output end of the inverter U1B is connected with a first output end of the inverter U1C and a counting signal input end of the single chip microcomputer, and a reset signal output end of the single chip microcomputer is connected with a second input end of the inverter U1C.

6. A lightning stroke action counting method of a lightning arrester is characterized by comprising the following steps: implemented with a counting circuit as claimed in any one of claims 1-5.

7. A lightning stroke action counting method of a lightning arrester is characterized by comprising the following steps: the lightning arrester action current generates a pulse voltage on a valve plate, the pulse voltage is rectified through a rectifier bridge and positive polarity pulse voltage is output, the positive polarity pulse voltage generates pulse current on the primary side of a current transformer, the secondary side of the current transformer induces pulse current, the pulse current forms a pulse voltage signal after being filtered through a load resistor R1 and a filter capacitor C1 and is input into the second input end of a phase inverter U1A, the first input end of the phase inverter U1A is connected with a high level, the phase inverter U1A outputs a low level to an RS latch, the RS latch sends the signal to a single chip microcomputer for counting, the single chip microcomputer resets the latch after counting is completed, and the next lightning arrester action is waited.

8. The method for counting lightning stroke actions of a lightning arrester according to claim 7, characterized in that: the RS latch comprises an inverter U1B and an inverter U1C, when a lightning arrester acts, the inverter U1A outputs a short-time low level to the inverter U1B, the inverter U1B outputs a high level to the inverter U1C, the inverter U1C outputs a low level to the inverter U1B, the inverter U1B continuously outputs a high level to the single chip microcomputer, the single chip microcomputer captures the high level signal and then carries out lightning stroke counting, after the counting is finished, the high level signal output by the inverter U1C is pulled down for a short time, and then the reset of the inverter U1B signal is realized.

Technical Field

The invention relates to a counting circuit for lightning stroke actions of a lightning arrester, and belongs to the technical field of safety control of electric power systems.

Background

The lightning current has the characteristics of short time and large impact current. The existing arrester monitor adopts the principle of electromagnetic induction, and when in lightning stroke, the mechanical number plate is shifted to count by inducing the discharge current of the arrester. The power technicians must check all the lightning arrester on-line monitoring devices regularly and patrol regularly. And the number of the lightning arresters in the power system is large, so that the workload of routing inspection of the lightning arresters by power technicians is also large.

The chinese patent application CN 102121949a discloses an electronic lightning stroke number acquisition system for a lightning arrester, which comprises a protection module, a rectification module, a charging and discharging module, an acquisition system, an isolation system, and a digital switching value module, which are connected in sequence. The advantages are that: the lightning stroke frequency can be converted into a digital signal and transmitted to a microcomputer for processing, and then the microcomputer transmits the data to the power monitoring system through a network, so that personnel are not needed to check the lightning stroke frequency on site, and manpower and material resources are saved. The disadvantages are that: the lightning current is uncertain, so that the amount of energy collected by the capacitor is uncertain, and a reliable driving optocoupler cannot be ensured; the isolation system adopts the relay, so that the power consumption is high, and the low-power-consumption design is not facilitated.

Disclosure of Invention

The invention aims to solve the technical problems that: the counting circuit overcomes the defects of the technology, provides a simpler counting circuit for lightning stroke actions of the lightning arrester, can accurately and reliably measure the action times, has extremely low power consumption, and is more suitable for low-power-consumption design.

The technical scheme provided by the invention is as follows: the utility model provides a counting circuit of arrester thunderbolt action, includes zinc oxide valve block, rectifier bridge, current transformer, inverter U1A, RS latch and singlechip, its characterized in that: the lightning arrester comprises a zinc oxide valve plate, a rectifier bridge, a current transformer, a load resistor R1, a filter capacitor C1, a phase inverter U1A, a reset signal output end and a singlechip counting signal input end and a reset signal output end, wherein the zinc oxide valve plate is connected with the lightning arrester in series, the input end of the rectifier bridge is connected with the zinc oxide valve plate in parallel, the primary side of the current transformer is connected with the output end of the rectifier bridge, the secondary side of the current transformer is connected with the load resistor R1 and the filter capacitor C1 in parallel, the first input end of the phase inverter U1A is connected with a high level, signals on the secondary side of the current transformer are subjected to filtering voltage stabilization processing to obtain pulse voltage signals, the signals are connected with the second input end of the phase inverter U1A, the output end of the phase inverter U1A is connected with the input end of an RS latch, the output end and the reset signal end of the RS latch are respectively connected with the counting signal input end and the reset signal output end of the singlechip, and when the high level signals output by the latch are obtained by the singlechip.

The lightning arrester action current generates a pulse voltage on a zinc oxide valve plate, the pulse voltage is rectified through a rectifier bridge and positive polarity pulse voltage is output, the positive polarity pulse voltage generates pulse current on the primary side of a current transformer, the secondary side of the current transformer induces pulse current, the pulse current forms a pulse voltage signal after being filtered through a load resistor and a filter capacitor, the pulse voltage signal is locked by a latch, and after the high-level signal output by the latch is acquired by a singlechip, the singlechip counts lightning stroke actions once and resets the latch.

Compared with the prior art, the invention has the advantages that: the circuit has simple structure, is basically voltage signal transmission, has extremely low required energy, is extremely beneficial to low-power-consumption design, can stably and reliably convert the lightning stroke frequency into a digital signal and transmit the digital signal to a microcomputer for processing, thereby completing counting.

Drawings

Fig. 1 is a circuit diagram of the lightning arrester action counting circuit.

Detailed Description

As shown in fig. 1, the counting circuit for lightning stroke actions of the lightning arrester of the embodiment includes a zinc oxide valve plate F1, a rectifier bridge D2, a current transformer L1, an inverter U1A, an RS latch (composed of an inverter UIB and an inverter UIC), and a single chip microcomputer, wherein the zinc oxide valve plate is connected in series with the lightning arrester, and an input end of the rectifier bridge is connected in parallel with the zinc oxide valve plate. The specification of the rectifier bridge is 5A/1500V. The secondary side of the rectifier bridge is connected in series with a current-limiting resistor R2 and then connected with the primary side of a current transformer L1, and the secondary side of the current transformer L1 is connected in parallel with a load resistor R1, a filter capacitor C1 and a voltage-stabilizing tube V1. The resistor R1 is rated at 36K Ω/0.25W, and the resistor R2 is rated at 1.5M Ω/0.25W. When the lightning arrester operates, a pulse current is induced on the secondary side of the current transformer, and a pulse voltage is generated by the resistor R1. The specification of the capacitor C1 is 330uF/25V, and the specification of the voltage regulator tube V1 is 3.3V. The first input end of the phase inverter U1A is connected with a high level, the negative electrode of the voltage regulator tube V1 is connected with the second input end of the phase inverter U1A, the output end of the phase inverter U1A is connected with the input end of the RS latch, the output end and the reset signal end of the RS latch are respectively connected with the counting signal input end and the reset signal output end of the singlechip, and when the high level signal output by the latch is acquired by the singlechip, the singlechip counts the lightning stroke action once and resets the latch.

The RS latch in the counting circuit is triggered by low level, namely when the input end of the RS latch is at low level, the RS latch outputs high level signals. Specifically, as shown in fig. 1, the RS latch includes an inverter U1B and an inverter U1C, a first input terminal of the inverter U1B is connected to an output terminal of the inverter U1A, an output terminal of the inverter U1C is connected to a second input terminal of the inverter U1B, an output terminal of the inverter U1B is connected to a first output terminal of the inverter U1C and a count signal input terminal of the single chip, and a reset signal output terminal of the single chip is connected to a second input terminal of the inverter U1C.

As shown in fig. 1, the counting circuit of the present embodiment further includes a diode D1 for filtering the negative signal, and the model of the diode D1 is LL 4148. The anode of the diode D1 is connected with the same name end of the secondary side of the current transformer L1, and the cathode of the diode D1 is connected with the cathode of the voltage regulator tube V1.

In this embodiment, the inverter UIA, the inverter UIB, and the inverter UIC are integrated inside a logic chip U1, which is SN74HC00 QDRQ. The trigger signal RS is connected with pin 2 of the UI, and the output signal is connected with pin 11 of the UI. The output signal can be directly connected with the single chip microcomputer, so that the microcomputer can record the lightning stroke times in real time and transmit the data to an online monitoring system through a wireless network, and workers can know the lightning stroke times of each lightning arrester on a platform without looking up the lightning stroke times at each lightning arrester.

The lightning stroke action counting method of the lightning arrester comprises the following steps:

the lightning arrester action current generates a pulse voltage on the valve plate, the pulse voltage is rectified through the rectifier bridge and positive polarity pulse voltage is output, the positive polarity pulse voltage generates pulse current on the primary side of the current transformer, pulse current is induced on the secondary side of the current transformer, the pulse current forms a pulse voltage signal after being filtered through the load resistor and the filter capacitor and is connected with the second input end of the phase inverter U1A, and the first input end of the phase inverter U1A is connected with a high level. When the lightning arrester acts, the phase inverter U1A outputs low level to the RS latch, the RS latch sends an output high level signal to the single chip microcomputer for counting, and the single chip microcomputer resets the latch after counting is completed to wait for the next action of the lightning arrester. Specifically, the RS latch includes an inverter U1B and an inverter U1C, when the lightning arrester operates, the inverter U1A outputs a short low level to the inverter U1B, the inverter U1B outputs a high level to the inverter U1C, and the inverter U1C outputs a low level to the inverter U1B, so that the inverter U1B continuously outputs a high level to the single chip microcomputer, the single chip microcomputer performs lightning strike counting after capturing the high level signal, the high level signal output by the inverter U1C is pulled down for a short time after counting is completed, and then the reset of the signal of the inverter U1B is realized.

The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.