Lightning stroke current acquisition structure of lightning arrester on-line monitoring system

Abstract

The utility model discloses a lightning stroke current acquisition structure of a lightning arrester on-line monitoring system, which comprises an induction coil, an energy storage circuit, a voltage comparison circuit, a discharge circuit and a lightning stroke prompt module, the induction coil is connected to the energy storage circuit, the energy storage circuit is connected with the voltage comparison circuit and the discharge circuit, and the voltage comparison circuit is connected to the lightning stroke prompt module. The beneficial effects of the utility model are that: based on Rogowski coil and induction electricity-taking technology, no extra power supply is needed, the power supply of the circuit is obtained by using lightning stroke heavy current signals through an induction electricity-taking mode, and the whole acquisition circuit is constructed by adopting passive elements in order to ensure that the acquired electric quantity is enough, so that the cost is reduced. Accurate and sufficient electric quantity does not need to be provided, and meanwhile a large amount of cost is reduced.

Description

Technical Field

[0001] The utility model relates to a lightning current acquisition structure of an on-line monitoring system for lightning arresters, belonging to the technical field of electric power. Background Art

[0002] Among numerous lightning strike acquisition circuits, it is the most effective way to use Rogowski coils to acquire lightning currents. However, the signals collected by this scheme need various shaping and integration, and for different Rogowski coils, the same circuit cannot be used for common acquisition. If Rogowski coils are used, additional power supply has to be given to the circuit to ensure that the analog IC and the whole circuit have accurate and sufficient power. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a lightning current acquisition structure of an on-line monitoring system for lightning arresters. This structure adopts an expansion based on Rogowski coils and inductive power extraction technology, without the need to provide additional power. Through the way of inductive power extraction, the power supply of the circuit is obtained by using the large lightning current signal. At the same time, in order to ensure that the collected power is sufficient for use, the whole acquisition circuit is built with passive components, without the need to provide accurate and sufficient power, while reducing a large amount of costs. At the same time, the equipment made by this technology can be directly installed on the base of the lightning arrester and become a part of the lightning arrester.

[0004] The utility model is realized through the following scheme: a lightning current acquisition structure of an on-line monitoring system for lightning arresters, including an induction coil, an energy storage circuit, a voltage comparison circuit, a discharge circuit and a lightning strike prompt module. The induction coil is connected to the energy storage circuit, the energy storage circuit is connected to the voltage comparison circuit and the discharge circuit, and the voltage comparison circuit is connected to the lightning strike prompt module.

[0005] The input end of the energy storage circuit is an induction coil input interface, and the induction coil is connected to the induction coil input interface.

[0006] The lightning strike prompt module consists of an electromagnetic relay.

[0007] The output end of the voltage comparison circuit is an electromagnetic relay interface, and the lightning strike prompt module is connected to the electromagnetic relay interface.

[0008] One end of the lightning strike prompt module is connected to the digital ground, and the other end is connected to the IO port of the single-chip microcomputer.

[0009] The beneficial effects of the utility model are as follows:

[0010] The lightning current acquisition structure of an on-line monitoring system for a lightning arrester of the present utility model is based on a Rogowski coil and inductive power extraction technology, without the need to provide an additional power supply. By means of inductive power extraction, the power supply of the circuit is obtained using a large lightning current signal. At the same time, in order to ensure that the collected power is sufficient for use, the entire acquisition circuit is built with passive components, without the need to provide precise and sufficient power, while reducing a large amount of costs. At the same time, the equipment made by this technology can be directly installed on the base of the lightning arrester and become a part of the lightning arrester. Brief Description of the Drawings

[0011] Figure 1 It is a connection structure diagram of the lightning current acquisition structure of an on-line monitoring system for a lightning arrester of the present utility model.

[0012] Figure 2 It is a circuit diagram of the lightning current acquisition structure of an on-line monitoring system for a lightning arrester of the present utility model.

[0013] In the figure: 100 is an induction coil, 200 is an energy storage circuit, 201 is an induction coil input interface, 300 is a voltage comparison circuit, 301 is an electromagnetic relay interface, 400 is a discharge circuit, and 500 is a lightning strike prompt module. Detailed Embodiment

[0014] The following combines Figure 1 and Figure 2 to further illustrate the present utility model, but the protection scope of the present utility model is not limited to the described content.

[0015] For clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would clutter the present utility model with unnecessary details. It should be considered that in the development of any actual embodiment, a large number of implementation details must be made to achieve the specific goals of the developer, for example, due to system-related or business-related limitations, changing from one embodiment to another. Additionally, it should be considered that such development work may be complex and time-consuming, but it is only routine work for those skilled in the art.

[0016] Referring to Figure 1 , a lightning current acquisition structure of an on-line monitoring system for a lightning arrester includes an induction coil 100, an energy storage circuit 200, a voltage comparison circuit 300, a discharge circuit 400, and a lightning strike prompt module 500. The induction coil 100 is connected to the energy storage circuit 100, the energy storage circuit 200 is connected to the voltage comparison circuit 300 and the discharge circuit 400, and the voltage comparison circuit 300 is connected to the lightning strike prompt module 500.

[0017] The input end of the energy storage circuit 200 is the induction coil input interface 201, and the induction coil 100 is connected to the induction coil input interface 201.

[0018] The lightning strike prompt module 500 is composed of electromagnetic relays.

[0019] The output terminal of the voltage comparison circuit 300 is the electromagnetic relay interface 301, and the lightning strike prompt module 500 is connected to the electromagnetic relay interface 301.

[0020] One end of the lightning strike prompt module 500 is connected to the digital ground, and the other end is connected to the IO port of the single-chip microcomputer.

[0021] Energy storage circuit 200: The energy storage capacitor selects a super capacitor to store the electric energy induced by the secondary coil and converted into direct current through the rectifier bridge. Ensure that the subsequent voltage comparison circuit can work normally. When the capacitor voltage reaches the set threshold, the voltage comparison circuit will turn on the thyristor, so that all the energy inside the capacitor is used to drive the electromagnetic relay to act once.

[0022] For the voltage comparison circuit 300, when the capacitor voltage reaches the set threshold, the transient suppression diode instantly becomes in a low-resistance state, enabling the MOS transistor to turn on, and releasing all the energy in the energy storage capacitor through the electromagnetic relay coil. The electromagnetic relay closes, completing a lightning strike counting process.

[0023] Discharge circuit 400: It is composed of an electromagnetic relay, a MOS transistor circuit and a freewheeling circuit. When the enable terminal of the MOS transistor is turned on by the voltage comparison circuit, the energy stored inside the energy storage capacitor will be released through the electromagnetic relay coil. The reverse pulse energy generated during the coil discharge can be absorbed and released by the freewheeling diode connected in parallel with it.

[0024] Lightning strike prompt module 500: It is mainly composed of an electromagnetic relay. When the signal from the voltage comparison circuit passes through the electromagnetic relay, the electromagnetic relay switch closes. One end of the switch is connected to the digital ground, and the other end is connected to the IO port of the single-chip microcomputer. Through the interrupt method, the single-chip microcomputer can collect a lightning strike count.

[0025] The circuit diagram is referred to Figure 2 , and the operation process is as follows:

[0026] After the induction coil collects the lightning strike current, a current signal is formed on the secondary side. This signal becomes a direct current after passing through the rectifier bridge. The direct current charges the super capacitor C1.

[0027] When the voltage of C1 is high enough, the transient diode D2 immediately becomes in a low-resistance state and conducts. After being pulled up by R2, Q1 is turned on.

[0028] After Q1 is turned on, the electric quantity of C1 is released to the DC circuit through Q1. At this time, the current will pass through 1 of OUT and then to 2, where 1 and 2 of OUT are respectively connected to the coil of the electromagnetic relay. When the current flows through the coil of the relay, the current relay switch closes.

[0029] When the power of the super capacitor C1 is completely released, the reverse pulse energy existing in the electromagnetic relay coil is released through D3. When there is no power flowing through the electromagnetic relay coil, the electromagnetic relay switch is disconnected. At the same time, since the power of C1 is completely released, D2 returns to the high-impedance state and Q1 is turned off.

[0030] Although the technical solutions of the present utility model have been described and listed in detail, it should be understood that for those skilled in the art, making modifications to the above embodiments or adopting equivalent alternative solutions are obvious to those skilled in the art. These modifications or improvements made without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.

Claims

1. A lightning current collection structure for an online monitoring system of a lightning arrester, characterized in that: The invention comprises an induction coil (100), an energy storage circuit (200), a voltage comparison circuit (300), a discharge circuit (400) and a lightning strike warning module (500), wherein the induction coil (100) is connected to the energy storage circuit (200), the energy storage circuit (200) is connected to the voltage comparison circuit (300) and the discharge circuit (400), and the voltage comparison circuit (300) is connected to the lightning strike warning module (500).

2. The lightning current acquisition structure of the arrester online monitoring system according to claim 1 is characterized in that: The input end of the energy storage circuit (200) is an induction coil input interface (201), and the induction coil (100) is connected to the induction coil input interface (201).

3. The lightning current acquisition structure of the arrester online monitoring system according to claim 1 is characterized in that: The lightning strike warning module (500) is composed of an electromagnetic relay.

4. The lightning current acquisition structure of the arrester online monitoring system according to claim 3 is characterized in that: The output end of the voltage comparison circuit (300) is an electromagnetic relay interface (301), and the lightning strike prompt module (500) is connected to the electromagnetic relay interface (301).

5. The lightning current acquisition structure of the arrester online monitoring system according to claim 1 is characterized in that: One end of the lightning strike prompt module (500) is connected to the digital ground, and the other end is connected to the IO port of the single chip microcomputer.

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