Current fluctuation fault acquisition system

Abstract

The utility model relates to the technical field of distribution lines, and provides a current fluctuation fault acquisition system, which comprises a sampling resistor RS, a control module, a power supply module, a communication module, a current detection circuit, a primary amplification circuit and a secondary amplification circuit, the input end of the current detection circuit is connected with one end of the sampling resistor RS, the output end of the secondary amplification circuit is connected with the control module, the control module sends acquisition information to a host end through the communication module, and the power supply module supplies power to the acquisition system. According to the technical scheme, the current fluctuation condition of the distribution line can be monitored in real time, powerful support is provided for troubleshooting and repairing, and the stability and reliability of a power system can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of distribution line, specifically, relates to a current fluctuation fault collection system. BACKGROUND

[0002] In the power system, the distribution line is the key link of power transmission, and its operation state directly affects the stability of the entire power system and the power quality of users. However, in the distribution line of the power grid, it is usually laid in complex and changeable environments, such as urban streets, rural fields, mountainous areas, etc., so it is easily affected by various factors, especially equipment aging, which may cause the current in the distribution line to fluctuate, thereby affecting the normal operation of the power system. In order to avoid this problem, it is necessary to send maintenance personnel for regular maintenance, which consumes a large amount of human resources in task allocation and work, and is time-consuming and laborious to maintain. SUMMARY

[0003] The utility model provides a current fluctuation fault collection system, which solves the problem of time-consuming and laborious maintenance of the existing distribution line.

[0004] The technical scheme of the utility model is as follows:

[0005] A current fluctuation fault collection system, comprising a sampling resistor RS, a control module, a power supply module, a communication module, and a current detection circuit, a first-stage amplification circuit and a second-stage amplification circuit connected in sequence, the sampling resistor RS is connected in parallel at the measuring point of the distribution line, one end of the sampling resistor RS is connected to the input end of the current detection circuit, the output end of the second-stage amplification circuit is connected to the control module, the control module sends collection information to the host end through the communication module, and the power supply module supplies power to the collection system.

[0006] Further, the current detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and an operational amplifier U1, one end of the resistor R1 is connected to one end of the sampling resistor RS, the second end of the resistor R1 is grounded, the first end of the resistor R1 is connected to the inverting input end of the operational amplifier U1 after being connected in series with the resistor R2 and the capacitor C1 in sequence, the non-inverting input end of the operational amplifier U1 is grounded, the output end of the operational amplifier U1 is connected to the inverting input end through the resistor R3, the capacitor C2 is connected in parallel to the resistor R3, and the output end of the operational amplifier U1 outputs a first current signal.

[0007] Further, the primary amplification circuit comprises resistance R4, resistance R5, resistance R6, capacitor C3, capacitor C4 and operational amplifier U2, the first end of the resistance R4 is connected with the output end of the current detection circuit, the second end of the resistance R4 is connected with the inverting input end of the operational amplifier U2 through the capacitor C3, the first end of the capacitor C4 is connected with the second end of the resistance R4, the second end of the capacitor C4 is grounded, the first end of the resistance R6 is connected with the inverting input end of the operational amplifier U2, the second end of the resistance R6 is grounded, the first end of the resistance R5 is connected with the second end of the resistance R4, the second end of the resistance R5 is connected with the output end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded, and the output end of the operational amplifier U2 outputs a second current signal.

[0008] Further, the secondary amplification circuit comprises resistance R7, resistance R8, capacitor C5, capacitor C6 and operational amplifier U3, the first end of the resistance R7 is connected with the output end of the primary amplification circuit, the second end of the resistance R7 is connected with the inverting input end of the operational amplifier U3 through the capacitor C5, the non-inverting input end of the operational amplifier U3 is grounded, the output end of the operational amplifier U3 is connected with the inverting input end through the resistance R8, the capacitor C6 is connected in parallel with the resistance R8, and the output end of the operational amplifier U3 is connected with the control module.

[0009] Further, the detection control circuit comprises a triode Q1, a relay K1, a resistance R11 and a resistance R12, the base of the triode Q1 is connected with the control module through the resistance R11, the emitter of the triode Q1 is grounded through the resistance R12, the collector of the triode Q1 is connected with a power supply after passing through the input end of the relay K1, and the common end and the normally open end of the relay K1 are connected in series between a power distribution line and a sampling resistance RS.

[0010] The working principle and beneficial effects of the utility model are as follows:

[0011] In the utility model, the system is connected in parallel with the sampling resistance RS on the to-be-measured point of the power distribution line, and the current signal in the power distribution line is collected in real time. The current signal is converted into a voltage signal through the sampling resistance RS, and then input into the current detection circuit. The current detection circuit preliminarily processes the received voltage signal, and then transmits it to the primary amplification circuit for amplification. The amplified signal is further amplified through the secondary amplification circuit, so as to ensure that the strength and the clarity of the signal meet the requirements of subsequent processing. The output end of the secondary amplification circuit is connected with the control module, the control module collects, processes and analyzes the amplified signal. When the current fluctuation fault is detected, the control module sends the collected fault information to the host end through the communication module, so that the staff can discover and handle the fault in time.

[0012] The utility model discloses a current fluctuation fault acquisition system, which can monitor the current fluctuation of the power distribution line in real time, capture and report the current fluctuation fault in time, thereby effectively preventing the equipment damage and power interruption caused by the current fluctuation. Through the accurate collection and analysis of the current signal, the system can provide accurate fault information, provide strong support for fault troubleshooting and repair, and help improve the stability and reliability of the power system.

[0013] The utility model will be described in further detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the circuit principle diagram of the utility model current fluctuation fault acquisition system;

[0015] Figure 2 It is the circuit diagram of the utility model current detection circuit;

[0016] Figure 3 It is the circuit diagram of the utility model primary amplifier circuit;

[0017] Figure 4 It is the circuit diagram of the utility model secondary amplifier circuit;

[0018] Figure 5 It is the circuit diagram of the utility model detection control circuit. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be described clearly and completely below in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are involved in the protection scope of the utility model. Embodiment 1

[0020] As shown in Figure 1 The utility model discloses a current fluctuation fault acquisition system, which includes a sampling resistor RS, a control module, a power supply module, a communication module, and a current detection circuit, a primary amplifier circuit and a secondary amplifier circuit connected in sequence. The sampling resistor RS is connected in parallel to the measured point of the power distribution line. One end of the current detection circuit is connected to the sampling resistor RS. The output end of the secondary amplifier circuit is connected to the control module. The control module sends acquisition information to the host end through the communication module. The power supply module supplies power to the acquisition system.

[0021] In this embodiment, the system connects the sampling resistor RS in parallel on the detection point of the power distribution line to collect the current signal in the power distribution line in real time. The current signal is converted into a voltage signal through the sampling resistor RS, and then input into the current detection circuit. The current detection circuit preliminarily processes the received voltage signal, and then transmits it to the first-stage amplification circuit for amplification. The amplified signal is further amplified by the second-stage amplification circuit to ensure that the strength and clarity of the signal meet the requirements of subsequent processing. The output end of the second-stage amplification circuit is connected with the control module, which collects, processes and analyzes the amplified signal. When detecting the current fluctuation fault, the control module sends the collected fault information to the host end through the communication module, so that the staff can timely discover and handle the fault.

[0022] In one embodiment, the detection point is the contact between the power distribution line and the support.

[0023] Further, as shown in Figure 2 , the current detection circuit includes resistors R1, R2, R3, capacitors C1, C2 and an operational amplifier U1. One end of the resistor R1 is connected to one end of the sampling resistor RS, the second end of the resistor R1 is grounded, the first end of the resistor R1 is connected to the inverting input terminal of the operational amplifier U1 after being connected to the resistor R2 and the capacitor C1 in series, the non-inverting input terminal of the operational amplifier U1 is grounded, the output terminal of the operational amplifier U1 is connected to the inverting input terminal through the resistor R3, the capacitor C2 is connected in parallel to the resistor R3, and the output terminal of the operational amplifier U1 outputs the first current signal.

[0024] In this embodiment, the current detection circuit takes the operational amplifier U1 (LT1128) as the core, and uses resistors R1, R2, R3 and capacitors C1, C2 to form a reverse proportional amplification circuit with feedback stabilization function. The sampling resistor RS is connected in parallel on the detection point of the power distribution line to collect the current and convert it into a voltage signal in real time. This voltage signal is first divided by the resistor R1, and then input to the inverting input terminal of the operational amplifier U1 after passing through the filter network composed of the resistor R2 and the capacitor C1 to filter out high-frequency noise. The non-inverting input terminal of the operational amplifier U1 is grounded, thus forming a reverse amplifier. The output terminal of the operational amplifier U1 is connected to its inverting input terminal through the resistor R3, forming a negative feedback to ensure the stability of the circuit. At the same time, the capacitor C2 is connected in parallel to the resistor R3 to further stabilize the circuit and filter out high-frequency interference. The output terminal of the operational amplifier U1 outputs the first current signal, which is the result of the original current signal after amplification and filtering.

[0025] Further, as shown in Figure 3As shown, the first-stage amplification circuit includes resistors R4, R5, R6, capacitors C3, C4, and operational amplifier U2. The first end of resistor R4 is connected to the output end of the current detection circuit, the second end of resistor R4 is connected to the inverting input end of operational amplifier U2 through capacitor C3, the first end of capacitor C4 is connected to the second end of resistor R4, the second end of capacitor C4 is grounded, the first end of resistor R6 is connected to the inverting input end of operational amplifier U2, the second end of resistor R6 is grounded, the first end of resistor R5 is connected to the second end of resistor R4, the second end of resistor R5 is connected to the output end of operational amplifier U2, the non-inverting input end of operational amplifier U2 is grounded, and the output end of operational amplifier U2 outputs a second current signal.

[0026] In this embodiment, the first-stage amplification circuit mainly includes resistors R4, R5, R6, capacitors C3, C4, and operational amplifier U2 (OPA2211). The current signal output by the current detection circuit is first transmitted through resistor R4, and then is divided into two paths: one path is coupled to the inverting input end of operational amplifier U2 through capacitor C3, and the other path is grounded through capacitor C4 to form an alternating current bypass to block direct current components and ensure that only alternating current signals are amplified. Resistor R6 is connected to the inverting input end of operational amplifier U2 as a feedback resistor, and together with resistor R5 forms a negative feedback network for stabilizing the amplification circuit and controlling the amplification factor. The non-inverting input end of operational amplifier U2 is grounded, so the circuit constitutes a reverse amplifier. When the input signal changes, the output end of operational amplifier U2 will generate an amplified signal, i.e., a second current signal.

[0027] Further, as shown in Figure 4 the second-stage amplification circuit includes resistors R7, R8, capacitors C5, C6, and operational amplifier U3. The first end of resistor R7 is connected to the output end of the first-stage amplification circuit, the second end of resistor R7 is connected to the inverting input end of operational amplifier U3 through capacitor C5, the non-inverting input end of operational amplifier U3 is grounded, the output end of operational amplifier U3 is connected to the inverting input end through resistor R8, capacitor C6 is connected in parallel to resistor R8, and the output end of operational amplifier U3 is connected to the control module.

[0028] In the embodiment, the secondary amplification circuit is mainly composed of resistors R7 and R8, capacitors C5 and C6 and an operational amplifier U3 (OPA2211). The signal output by the primary amplification circuit is first transmitted to the secondary amplification circuit through the resistor R7. At the second end of the resistor R7, the signal is coupled to the inverting input terminal of the operational amplifier U3 through the capacitor C5, realizing the transmission of the alternating signal and blocking the direct current component. The non-inverting input terminal of the operational amplifier U3 is grounded, so that the circuit again constitutes an inverting amplifier. The output terminal of the operational amplifier U3 is connected to the inverting input terminal thereof through the resistor R8, forming a negative feedback, which is helpful to stabilize the amplification circuit and control the amplification factor. The capacitor C6 is connected in parallel with the resistor R8, for further filtering of high-frequency noise and improving the purity of the signal. Finally, the output terminal of the operational amplifier U3 outputs the amplified signal, which is connected to the control module for subsequent fault collection and processing.

[0029] Further, the sampling system further comprises a detection control circuit, as shown in Figure 5 The detection control circuit comprises a transistor Q1, a relay K1, a resistor R11 and a resistor R12. The base of the transistor Q1 is connected to the control module through the resistor R11, the emitter of the transistor Q1 is grounded through the resistor R12, the collector of the transistor Q1 is connected to the power supply through the input terminal of the relay K1, and the common terminal and the normally open terminal of the relay K1 are connected in series between the power distribution line and the sampling resistor RS.

[0030] In the embodiment, in order to further eliminate the influence of the parallel sampling circuit on the power distribution line when it is not necessary to detect the voltage abnormality of the power distribution line, the detection control circuit is used to control the connection between the entire collection system and the power distribution line. When detection is needed, the high-level signal output by the control module drives the transistor Q1 to be turned on, and further drives the relay K1 to be closed. At this time, the sampling resistor RS is normally connected in parallel to the to-be-detected point of the power distribution line, and the subsequent current detection circuit, the primary amplification circuit and the secondary amplification circuit work normally.

[0031] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A current fluctuation fault acquisition system characterized by, The current detection circuit includes resistance R1, resistance R2, resistance R3, capacitor C1, capacitor C2 and operational amplifier U1, the first end of the resistance R1 is connected with one end of the sampling resistance RS, the second end of the resistance R1 is grounded, the first end of the resistance R1 is connected with the reverse input end of the operational amplifier U1 in sequence after being connected with the resistance R2 and the capacitor C1 in sequence, the noninverting input end of the operational amplifier U1 is grounded, the output end of the operational amplifier U1 is connected with the inverting input end through the resistance R3, the capacitor C2 is connected with the resistance R3 in parallel, and the output end of the operational amplifier U1 outputs a first current signal.

2. The current fluctuation fault acquisition system according to claim 1, wherein The first-stage amplification circuit includes resistance R4, resistance R5, resistance R6, capacitor C3, capacitor C4 and operational amplifier U2, the first end of the resistance R4 is connected with the output end of the current detection circuit, the second end of the resistance R4 is connected with the inverting input end of the operational amplifier U2 through the capacitor C3, the first end of the capacitor C4 is connected with the second end of the resistance R4, the second end of the capacitor C4 is grounded, the first end of the resistance R6 is connected with the inverting input end of the operational amplifier U2, the second end of the resistance R6 is grounded, the first end of the resistance R5 is connected with the second end of the resistance R4, the second end of the resistance R5 is connected with the output end of the operational amplifier U2, the noninverting input end of the operational amplifier U2 is grounded, and the output end of the operational amplifier U2 outputs a second current signal.

3. The current fluctuation fault acquisition system of claim 1, wherein, The second-stage amplification circuit includes resistance R7, resistance R8, capacitor C5, capacitor C6 and operational amplifier U3, the first end of the resistance R7 is connected with the output end of the first-stage amplification circuit, the second end of the resistance R7 is connected with the inverting input end of the operational amplifier U3 through the capacitor C5, the noninverting input end of the operational amplifier U3 is grounded, the output end of the operational amplifier U3 is connected with the inverting input end through the resistance R8, the capacitor C6 is connected with the resistance R8 in parallel, and the output end of the operational amplifier U3 is connected with the control module.

4. The current fluctuation fault acquisition system of claim 1, wherein, The detection control circuit includes triode Q1, relay K1, resistance R11 and resistance R12, the base of the triode Q1 is connected with the control module through the resistance R11, the emitter of the triode Q1 is grounded through the resistance R12, the collector of the triode Q1 is connected with the power supply through the input end of the relay K1, and the common end and the normally open end of the relay K1 are connected between the power distribution line and the sampling resistance RS.

5. The current fluctuation fault acquisition system of claim 1, wherein, ​

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