CN210572671U - Leakage current detection device based on SPD - Google Patents
Leakage current detection device based on SPD Download PDFInfo
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- CN210572671U CN210572671U CN201920970432.3U CN201920970432U CN210572671U CN 210572671 U CN210572671 U CN 210572671U CN 201920970432 U CN201920970432 U CN 201920970432U CN 210572671 U CN210572671 U CN 210572671U
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Abstract
The utility model discloses a leakage current detection device based on SPD, a serial communication port, hardware architecture include the filtering processing module, and the filtering processing module connects gradually with enlarged module, first-order RC low pass filtering processing module, and the rear end of first-order RC low pass filtering processing module is connected with resistance voltage divider module, and the microampere that is connected with SPD leaks current transformer is connected to the front end of filtering processing module. Compared with the prior art, the utility model discloses have high accuracy, can anti-interference microampere utmost point leakage current transformer, can carry out leading the amplification with weak current signal, handle through the wave filter and draw effectual signal.
Description
Technical Field
The utility model relates to a leakage current detection device based on SPD belongs to lightning protection equipment technical field.
Background
The lightning protection device (SPD for short) made of the zinc oxide piezoresistor is widely used for lightning protection of low-voltage lines in the industries of building electricity, railways, telecommunication, petrifaction, photovoltaic, wind power and the like, and the SPD plays an indispensable role in lightning protection, electromagnetic interference resistance, switching impact resistance and other surge currents from a power transmission and distribution line, a transformation and distribution power station to a computer room and from a communication machine room to the interior of equipment, so that the normal operation of various electrical equipment in a power network is ensured. However, with the dramatic increase in the number of SPDs installed, there is an increasing number of power accidents due to deterioration and failure of the SPDs. The abnormal deterioration and failure of the SPD, namely, the SPD is not tripped normally in time, so that the power supply is interrupted due to the tripping of a power network, or the fire accident caused by high temperature is also caused due to overlarge leakage current of the SPD.
Installing an SPD is an important protection measure to protect electrical equipment from electromagnetic pulses. The SPD can act in a very short time when a peak surge current or overvoltage is suddenly generated due to external interference, so that damage of the surge to other equipment in a loop is avoided. Therefore, whether the SPD is damaged or not or whether the performance of the SPD is reduced or not is timely detected, and the method has very important significance for avoiding accidents and reducing loss.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the problem of how to detect whether the SPD is damaged or the performance is reduced is solved.
In order to solve the technical problem, the technical scheme of the utility model a leakage current detection device based on SPD is provided, its characterized in that, hardware architecture include the filtering processing module, and the filtering processing module connects gradually with enlarged module, first-order RC low pass filtering processing module, and the rear end of first-order RC low pass filtering processing module is connected with resistance voltage-dividing module, and the microampere that is connected with SPD leaks current transformer is connected to the front end of filtering processing module.
Preferably, the circuit structure includes a resistor R117, one end of the resistor R117 is connected to one end of a resistor R118, one end of a resistor R119, and one end of a capacitor C71, the other end of the capacitor C71 is grounded, the other end of the resistor R118 is connected to one end of a capacitor C72 and an inverting input of an operational amplifier U22A, a non-inverting input of the operational amplifier U22A is grounded, an output of the operational amplifier U22A is connected to the other end of a capacitor C72, the other end of the resistor R119, and one end of a resistor R120, the other end of the resistor R120 is connected to one end of a resistor R121 and a non-inverting input of the operational amplifier U22B, the other end of the resistor R121 is grounded, the inverting input of the operational amplifier U22B is connected to one end of a resistor R122, the output of the operational amplifier U22B is connected to the other end of the resistor R122 and one end of the resistor R123, the other end of the resistor R123, One end of the capacitor C73 and the other end of the resistor R125 are connected to one end of the resistor R126 and one end of the capacitor C74, respectively, the other end of the resistor R126 is connected to one end of the resistor R127, and the other end of the capacitor C73, the other end of the capacitor C74 and the other end of the resistor R127 are all grounded.
Compared with the prior art, the utility model discloses have high accuracy, can anti-interference microampere utmost point leakage current transformer, can carry out leading the amplification with weak current signal, handle through the wave filter and draw effectual signal.
The utility model has the advantages of the precision that detects is high, stability is high, the reliability is high, can detect the microampere level leakage current of SPD, can detect the running state of MOV in real time, discovers in advance the MOV that became invalid, and the suggestion user in time changes, monitors the change of the leakage current of MOV online in real time.
Drawings
FIG. 1 is a hardware block diagram of a SPD-based leakage current detection apparatus;
fig. 2 is a circuit diagram of a leakage current detection device based on an SPD.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The utility model relates to a leakage current detection device based on SPD, it combines microampere utmost point leakage current transformer and analog quantity etc. together, as shown in FIG. 1, it includes microampere utmost point leakage current transformer, filtering processing module, enlargies module, one-order RC low pass filtering processing module. The filter processing module, the amplification module and the first-order RC low-pass filter processing module are sequentially connected, the microamp leakage current transformer is connected with the filter processing module and the SPD, and the rear end of the first-order RC low-pass filter processing module is connected with the resistance voltage dividing module.
The filtering processing module mainly allows signals in a certain frequency range to normally pass through, and filters out unnecessary partial signals. The amplifying module is mainly used for amplifying the small signals after a certain ratio. The first-order RC low-pass filtering processing module mainly carries out filtering processing on the amplified signals. The power supply for supplying power is a +/-15V power supply.
In this embodiment, the filtering processing module is an LM258 filter, and the amplifying module is an LM258 amplifying circuit.
The filtering processing module comprises an operational amplifier U22A, a resistor R117, a capacitor C71, a resistor R118, a resistor R119 and a capacitor C72; the amplifying module comprises a resistor R120, a resistor R122 and an operational amplifier U22B; the first-order RC low-pass filtering processing module comprises a resistor R124, a capacitor C73, a resistor R125 and a capacitor C74; the resistance voltage division module comprises a resistor R126 and a resistor R127.
As shown in fig. 2, a circuit structure of an SPD-based leakage current detection apparatus includes a resistor R117, one end of the resistor R117 is connected to one end of a resistor R118, one end of the resistor R119, and one end of a capacitor C71, the other end of a capacitor C71 is grounded, the other end of the resistor R118 is connected to one end of a capacitor C72 and the inverting input end of an operational amplifier U22A, the non-inverting input end of the operational amplifier U22A is grounded, the output end of the operational amplifier U22A is connected to the other end of a capacitor C72, the other end of the resistor R119, and one end of a resistor R120, the other end of the resistor R120 is connected to one end of a resistor R121 and the non-inverting input end of an operational amplifier U22B, the other end of the resistor R121 is grounded, the inverting input end of the operational amplifier U22B is connected to one end of a resistor R122, the output end of an operational amplifier U22B is connected to the other end, the other end of the resistor R124 is connected to one end of the resistor R125 and one end of the capacitor C73, the other end of the resistor R125 is connected to one end of the resistor R126 and one end of the capacitor C74, the other end of the resistor R126 is connected to one end of the resistor R127, and the other end of the capacitor C73, the other end of the capacitor C74 and the other end of the resistor R127 are all grounded.
The utility model discloses a detection that leakage current detection device leaks current to SPD is through LM258 wave filter processing based on SPD, thereby obtains the size that is fit for MCU or AD conversion chip's input range and tests the leakage current through first-order RC low pass filter circuit, resistance partial pressure after LM258 amplifier circuit handles again.
And processing fault information, namely analyzing whether the current state of the MOV needs to be replaced with the MOV or not when the current leakage current and temperature values exceed the normal range.
An amplifying circuit and a first-order RC low-pass filter circuit are formed on the basis of the LM258 operational amplifier. LM258 is composed of two independent high-gain operational amplifiers, and has the characteristics of low power consumption, wide frequency range and the like. The first order RC low pass filter circuit functions to filter out unwanted noise as much as possible while minimizing distortion of the desired signal. The leakage current detection of the SPD is formed by the circuits.
The utility model discloses an in leakage current detection device inserts AC220V, inserts microampere level current transformer based on SPD's the access return circuit.
The utility model discloses during the use, the microampere of SPD that will detect leaks in the current transformer inserts filtering processing module, through the filtering processing module after handling with useful signal through enlarging the module and enlargiing the back, handle through one-order RC low pass filtering processing module again, through resistance partial pressure module partial pressure, make the signal of output in the scope that MCU can detect. The utility model discloses a leakage current detection device based on SPD can realize that 5 ~ 2500uA leaks current and detects.
The utility model provides a pair of leakage current detection device based on SPD can monitor each looks MOV leakage current operation conditions, helps discovering in advance and in time changing the MOV of degradation and inefficacy at the shortest time to give the police dispatch newspaper, the suggestion user is in time changed, can avoid the production of lightning protection inefficacy and calamity effectively, monitors the change of the leakage current of MOV online in real time.
The utility model provides a pair of leakage current detection device based on SPD is used for SPD's leakage current to detect, can be used to measure occasions such as various electric power system, transformer substation, electrical equipment, lightning protection equipment. Meanwhile, the safety and the reliability of power utilization can be improved, and remote real-time monitoring service is realized, so that the higher requirements of users on intelligent lightning protection performance and stability are met.
The utility model provides a pair of leakage current detection device based on SPD is for cooperation surge protector group, realizes the multiple protection to the response thunderbolt, is a novel lightning protection technology combination application equipment, can be used to the building, and the chemical industry, the fire control, industrial equipment safety monitoring, highway electric power safety monitoring have wide application etc. with fields such as railway.
Claims (2)
1. The leakage current detection device based on the SPD is characterized in that a hardware structure comprises a filtering processing module, the filtering processing module is sequentially connected with an amplifying module and a first-order RC low-pass filtering processing module, the rear end of the first-order RC low-pass filtering processing module is connected with a resistance voltage division module, and the front end of the filtering processing module is connected with a microampere leakage current transformer connected with the SPD.
2. The SPD-based leakage current detection device according to claim 1, wherein the circuit structure includes a resistor R117, one end of the resistor R117 is connected to one end of a resistor R118, one end of a resistor R119 and one end of a capacitor C71, the other end of the capacitor C71 is grounded, the other end of the resistor R118 is connected to one end of a capacitor C72 and the inverting input end of an operational amplifier U22A, the non-inverting input end of the operational amplifier U22A is grounded, the output end of the operational amplifier U22A is connected to the other end of a capacitor C72, the other end of the resistor R119 and one end of a resistor R120, the other end of the resistor R120 is connected to one end of a resistor R121 and the non-inverting input end of an operational amplifier U22B, the other end of the resistor R121 is grounded, the inverting input end of the operational amplifier U22B is connected to one end of a resistor R122, the output end of an operational amplifier U22B is connected, the other end of the resistor R123 is connected with one end of a resistor R124, the other end of the resistor R124 is respectively connected with one end of a resistor R125 and one end of a capacitor C73, the other end of the resistor R125 is respectively connected with one end of a resistor R126 and one end of a capacitor C74, the other end of the resistor R126 is connected with one end of a resistor R127, and the other end of the capacitor C73, the other end of the capacitor C74 and the other end of the resistor R127 are all grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920970432.3U CN210572671U (en) | 2019-06-26 | 2019-06-26 | Leakage current detection device based on SPD |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920970432.3U CN210572671U (en) | 2019-06-26 | 2019-06-26 | Leakage current detection device based on SPD |
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| CN210572671U true CN210572671U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824104A (en) * | 2021-10-20 | 2021-12-21 | 上海电科臻和智能科技有限公司 | Intelligent backup protection integrated surge protection device |
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- 2019-06-26 CN CN201920970432.3U patent/CN210572671U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824104A (en) * | 2021-10-20 | 2021-12-21 | 上海电科臻和智能科技有限公司 | Intelligent backup protection integrated surge protection device |
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