CN110736890A - distribution network data safety early warning system - Google Patents

Abstract

The invention discloses a security early warning system for distribution network data, comprising a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filter transmission circuit, wherein the first voltage acquisition circuit collects the data of the main node of the distribution network Signal voltage, the second voltage acquisition circuit collects the data signal voltage of the sub-nodes of the distribution network, uses the transistor Q5 and the capacitor C4 to form a delay circuit to delay the output signal of the second voltage acquisition circuit, and uses the operational amplifier AR3 and the operational amplifier AR4. It forms an averaging circuit with diode D8 and diode D9 to filter out the average signal and input it into the inverting input terminal of the operational amplifier AR5. The operational amplifier AR5 performs subtraction processing on the signal. Finally, the operational amplifier AR6 compares the signal and inputs it into the filtering transmitting circuit, and the filtering transmits The circuit uses the inductor L1, the capacitor C6, and the capacitor C7 to form a filter circuit, which is filtered by the signal transmitter E1 and sent to the distribution network early warning module, which realizes the function of improving the data security early warning of the distribution network.

Description

A data security early warning system for distribution network

technical field

The invention relates to the technical field of circuits, in particular to a data security early warning system for a power distribution network.

Background technique

At present, the distribution network data management system mainly uses the data signal security encryption of the main node and subordinate sub-nodes to realize data security protection. The data processor of the power grid, and the main node receives the data of each sub-node, the main node is the control and management terminal of the distribution network, and the data signal of the sub-nodes should not only be guaranteed not to be leaked by external factors, but also the internal The tampering of the data signal by the employees, according to the prior art patent No. 201811250464.2 of a power grid data security protection method and a distributed power grid data security protection system, once the data signal is tampered with each time, it will leave data traces, That is to increase the data signal volume. When the data signal volume increases, the carrier power of the data signal will also increase accordingly. The prior art discloses the technology to prevent the leakage of data signals caused by external factors, and does not take into account the internal employees. tampering with the data signal.

SUMMARY OF THE INVENTION

In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a distribution network data security early warning system, which can detect the data signal voltage of the main node and the demarcation point of the distribution network in real time, and compare and adjust the detection signals after adjusting. Converted to early warning signal of distribution network data security.

The technical scheme solved by the system is a distribution network data security early warning system, comprising a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filter transmission circuit, wherein the first voltage acquisition circuit collects the distribution network The main node data signal voltage, the second voltage acquisition circuit collects the distribution network sub-node data signal voltage, the delay comparison circuit uses the operational amplifier AR1, operational amplifier AR2 and diode D5-diode D7 to form a peak detection circuit to screen the first voltage. The peak signal of the output signal of the acquisition circuit is input into the non-inverting input terminal of the operational amplifier AR5, and the transistor Q5 and the capacitor C4 are used to form a delay circuit to delay the output signal of the second voltage acquisition circuit, and the operational amplifier AR3 and the operational amplifier AR4 are used. It forms an average circuit with diode D8 and diode D9 to filter out the average signal and input it into the inverting input terminal of the operational amplifier AR5. The operational amplifier AR5 performs subtraction processing on the signal. Among them, the transistor Q6 detects the inverting input terminal of the operational amplifier AR4 and the operational amplifier. AR1 outputs the signal potential difference, the feedback signal is sent to the inverting input terminal of the operational amplifier AR6, and the transistor Q7 detects the potential difference between the output signals of the operational amplifier AR5 and AR4, and feeds the feedback signal to the non-inverting input terminal of the operational amplifier AR2, and finally The op amp AR6 compares the signal and inputs it into the filter transmitter circuit. The filter transmitter circuit uses the inductor L1, the capacitor C6, and the capacitor C7 to form a filter circuit to filter and send it to the distribution network early warning module through the signal transmitter E1.

Due to the adoption of the above technical solutions, the present invention has the following advantages compared with the prior art;

1. Use transistor Q5 and capacitor C4 to form a delay circuit to delay the output signal of the second voltage acquisition circuit, and process the signal delay to ensure the synchronization of the signal, and use the operational amplifier AR3, operational amplifier AR4 and diodes D8 and diode D9 form an average circuit to filter out the average signal and input it into the inverting input terminal of the op amp AR5. When the data signal is modified, the data potential of the main node and the sub-node is not very large, so it is necessary to expand the potential difference between the two , and the main node is the peak signal, and the sub-nodes are the average signal, which can further expand the potential difference between the two, thereby improving the accuracy of judging the safety of the signal, and has great reliability;

2. The transistor Q6 detects the potential difference between the inverting input terminal of the operational amplifier AR4 and the output signal of the operational amplifier AR1, and feeds back the signal to the inverting input terminal of the operational amplifier AR6 to prevent the output signal potential of the operational amplifier AR6 from being too large and destroying the circuit. In addition, the transistor Q7 detects the potential difference between the output signals of the operational amplifier AR5 and the operational amplifier AR4, so as to prevent the potential difference between the two from being too small and causing the signal to be misjudged. Therefore, the feedback signal is sent to the non-inverting input terminal of the operational amplifier AR2 to compensate the signal. Finally, the filter circuit composed of inductor L1, capacitor C6 and capacitor C7 is used to filter and send it to the distribution network early warning module through the signal transmitter E1. When the data signal volume is abnormal, the signal transmitter E1 sends a signal to trigger the distribution network. The early warning module alarms, otherwise, the early warning module of the distribution network does not work, which realizes the function of improving the early warning of the data security of the distribution network.

Description of drawings

FIG. 1 is a circuit diagram of a delay comparison of a data security early warning system for a distribution network according to the present invention.

FIG. 2 is a first voltage acquisition circuit diagram of a distribution network data security early warning system of the present invention.

FIG. 3 is a second voltage acquisition circuit diagram of a distribution network data security early warning system of the present invention.

FIG. 4 is a circuit diagram of a filtering and transmitting circuit of a data security early warning system of a power distribution network according to the present invention.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to FIGS. 1 to 4 . The structural contents mentioned in the following embodiments are all referenced to the accompanying drawings.

A distribution network data security early warning system, comprising a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filter transmission circuit, the first voltage acquisition circuit collects the data signal voltage of the main node of the distribution network, and the first voltage acquisition circuit The second voltage acquisition circuit collects the data signal voltage of the sub-nodes of the distribution network, and the delay comparison circuit uses the operational amplifier AR1, the operational amplifier AR2 and the diode D5-diode D7 to form a peak detection circuit to screen the peak signal of the output signal of the first voltage acquisition circuit. Input into the non-inverting input terminal of operational amplifier AR5, and use transistor Q5 and capacitor C4 to form a delay circuit to delay the output signal of the second voltage acquisition circuit, and use operational amplifier AR3, operational amplifier AR4 and diode D8, diode D9 to form The average value circuit filters out the average signal input into the inverting input terminal of the operational amplifier AR5, and the operational amplifier AR5 performs subtraction processing on the signal. The transistor Q6 detects the potential difference between the inverting input terminal of the operational amplifier AR4 and the output signal of the operational amplifier AR1, and feedback The signal is sent to the inverting input terminal of the operational amplifier AR6, and the transistor Q7 detects the potential difference between the output signals of the operational amplifier AR5 and the operational amplifier AR4, and feeds back the signal to the non-inverting input terminal of the operational amplifier AR2. Finally, the operational amplifier AR6 compares the signals. In the input filtering and transmitting circuit, the filtering and transmitting circuit uses the inductor L1, the capacitor C6, and the capacitor C7 to form a filter circuit, which is filtered by the signal transmitter E1 and sent to the early warning module of the distribution network;

The delay comparison circuit uses the operational amplifier AR1, the operational amplifier AR2 and the diode D5-diode D7 to form a peak detection circuit, and the peak signal of the output signal of the first voltage acquisition circuit is screened and input into the non-inverting input terminal of the operational amplifier AR5, and a triode is used. Q5 and capacitor C4 form a delay circuit to delay the output signal of the second voltage acquisition circuit, and the delay processing of the signal is to ensure the synchronization of the signal, and the op amp AR3, op amp AR4 and diode D8, diode D9 are used. The average value circuit is formed to filter out the average signal input into the inverting input terminal of the op amp AR5. When the data signal is modified, the data potential of the main node and the sub-node is not very large, so it is necessary to expand the potential difference between the two, and the main node. It is a peak signal, and the sub-node is an average signal, which can further expand the potential difference between the two, thereby improving the accuracy of judging the safety of the signal. The operational amplifier AR5 performs subtraction processing on the signal, in which the transistor Q6 detects the inverting input terminal of the operational amplifier AR4 and The potential difference of the output signal of the operational amplifier AR1, the feedback signal is sent to the inverting input terminal of the operational amplifier AR6, to prevent the output signal potential of the operational amplifier AR6 from being too large and destroying the circuit, and the transistor Q7 detects the output of the operational amplifier AR5 and the operational amplifier AR4. Signal potential difference, to avoid the potential difference between the two is too small, making the signal misjudgment, so the feedback signal is sent to the non-inverting input terminal of the op amp AR2, which plays the role of compensating the signal. Finally, the op amp AR6 compares the signal and inputs it to the filter transmitting circuit Inside;

The specific structure of the delay comparison circuit, the inverting input terminal of the operational amplifier AR1 is connected to the anode of the diode D5 and one end of the resistor R5, and the output terminal of the operational amplifier AR1 is connected to the cathode of the diode D5, the anode of the diode D6 and the transistor Q6. Collector, the cathode of diode D6 is connected to the anode of diode D7 and one end of resistor R6, the other end of resistor R6 is connected to the other end of resistor R5 and the inverting input of operational amplifier AR2, and the non-inverting input of operational amplifier AR2 is connected to diode The cathode of D7, one end of capacitor C3 and the collector of transistor Q7, the other end of capacitor C3 is grounded, the base of transistor Q6 is connected to resistor R10, one end of resistor R12 and the inverting input of op amp AR4, the other end of resistor R10 One end is connected to the inverting input of the operational amplifier AR3 and the anode of the diode D8, the non-inverting input of the operational amplifier AR3 is connected to the emitter of the transistor Q5 and one end of the resistor R9, the collector of the transistor Q5 is connected to one end of the resistor R8, the transistor Q5 The base is connected to the other end of the resistor R8 and the other end of the capacitor C4, the other end of the resistor R9 and the capacitor C4 is grounded, the output end of the op amp AR3 is connected to the cathode of the diode D8, the anode of the diode D9, the cathode of the diode D9 is connected to the resistor R11 one end of the resistor R11, the other end of the resistor R11 is connected to one end of the capacitor C5 and the non-inverting input end of the op amp AR4, the other end of the capacitor C5 is grounded, and the output end of the op amp AR4 is connected to the other end of the resistor R12 and the other end of the resistor R13 and the resistor R15. One end, the other end of the resistor R13 is connected to one end of the resistor R14 and the inverting input end of the op amp AR5, the other end of the resistor R14 is grounded, the other end of the resistor R15 is connected to the base of the transistor Q7, and the output end of the op amp AR5 is connected The emitter of transistor Q7 and one end of resistor R16, the non-inverting input terminal of operational amplifier AR6, the non-inverting input terminal of operational amplifier AR5 is connected to the other end of resistor R16 and the output terminal of operational amplifier AR2, and the inverting terminal of operational amplifier AR6 The input terminal is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the emitter of the transistor Q6.

On the basis of the above scheme, the filter transmitting circuit uses the inductor L1, the capacitor C6 and the capacitor C7 to form a filter circuit after filtering, and then sends it to the distribution network early warning module through the signal transmitter E1. When the data signal volume is abnormal, the signal The transmitter E1 sends a signal to trigger the alarm of the distribution network early warning module. On the contrary, the distribution network early warning module does not work. One end of the inductor L1 is connected to one end of the resistor R18 and one end of the capacitor C6, and the other end of the resistor R18 is connected to the output of the op amp AR6. The other end of the inductor L1 is connected to one end of the capacitor C7, one end of the resistor R19, the negative electrode of the voltage regulator tube D10, the other end of the capacitor C6 and the capacitor C7 is grounded, the positive electrode of the voltage regulator tube D10 is connected to the ground, and the other end of the resistor R19 is connected to the signal transmitter E1.

On the basis of the above solution, the first voltage acquisition circuit uses the voltage collector J1 of the model PIM600MC to collect the data signal voltage of the main node of the distribution network, and simultaneously uses the triode Q1 and the triode Q2 to form a signal enhancement circuit to enhance the signal. The second voltage acquisition circuit selects the voltage collector J2 with the model of PIM600MC to collect the data signal voltage of the sub-nodes of the distribution network. At the same time, the transistor Q3 and the transistor Q4 are used to form a signal enhancement circuit to enhance the signal. The power terminal of the voltage collector J1 is connected to the power supply +5V. The ground terminal of the voltage collector J1 is grounded, the output terminal of the voltage collector J1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2 and the negative electrode of the Zener tube D1, the positive pole of the Zener tube D1 is grounded, and the resistor R2 The other end of the transistor Q1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the base of the transistor Q2 and the positive electrode of the diode D2, the emitter of the transistor Q2 is connected to the emitter of the transistor Q1, and the negative electrode of the diode D2 is connected to one end of the capacitor C1. The other end of C1 is connected to the collector of the transistor Q2 and the non-inverting input of the operational amplifier AR1; the power supply terminal of the voltage collector J2 is connected to the power supply +5V, the ground terminal of the voltage collector J2 is grounded, and the output terminal of the voltage collector J2 is connected to a resistor One end of R3, the other end of resistor R3 is connected to one end of resistor R4 and the negative electrode of Zener tube D3, the positive pole of Zener tube D3 is grounded, the other end of resistor R4 is connected to the base of transistor Q3, and the collector of transistor Q3 is connected to transistor Q4 The base of the diode D4 and the anode of the diode D4, the emitter of the transistor Q3 is connected to the emitter of the transistor Q4, the cathode of the diode D4 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the collector of the transistor Q4 and the collector of the transistor Q5.

When the present invention is used specifically, a distribution network data security early warning system includes a first voltage acquisition circuit, a second voltage acquisition circuit, a delay comparison circuit and a filter transmission circuit, wherein the first voltage acquisition circuit collects the main data of the distribution network. The node data signal voltage, the second voltage acquisition circuit collects the distribution network sub-node data signal voltage, the delay comparison circuit uses the op amp AR1, op amp AR2 and diode D5-diode D7 to form a peak detection circuit to filter the first voltage acquisition The peak signal of the output signal of the circuit is input into the non-inverting input terminal of the operational amplifier AR5, and the delay circuit formed by the transistor Q5 and the capacitor C4 is used to delay the output signal of the second voltage acquisition circuit, and the delay processing of the signal is to ensure the synchronization of the signal. , and use the operational amplifier AR3, operational amplifier AR4 and diode D8, diode D9 to form an average circuit to filter out the average signal input into the inverting input terminal of the operational amplifier AR5, when the data signal is modified, the data of the main node and sub-node The potential is not very large, so it is necessary to expand the potential difference between the two, and the main node is the peak signal, and the sub-node is the average signal, which can further expand the potential difference between the two, thereby improving the accuracy of judging the safety of the signal. The signal is subtracted, in which the transistor Q6 detects the potential difference between the inverting input terminal of the operational amplifier AR4 and the output signal of the operational amplifier AR1, and feeds the feedback signal to the inverting input terminal of the operational amplifier AR6 to prevent the output signal potential of the operational amplifier AR6 from being too large. , destroy the circuit, and the transistor Q7 detects the potential difference between the output signals of the operational amplifier AR5 and the operational amplifier AR4, so as to avoid the potential difference between the two being too small, which will make the signal misjudgment, so the feedback signal is sent to the non-inverting input terminal of the operational amplifier AR2, and the To the effect of the compensation signal, finally the op amp AR6 compares the signal and then inputs it into the filter transmitter circuit. The filter transmitter circuit uses the inductor L1, the capacitor C6, and the capacitor C7 to form a filter circuit, which is filtered by the signal transmitter E1 and sent to the early warning module of the distribution network. .

The above is a further detailed description of the present invention in conjunction with the specific embodiments, and it cannot be considered that the specific implementation of the present invention is limited to this; , the expansion and the replacement of the operation method and data should all fall within the protection scope of the present invention.

Claims (5)

1. The power distribution network data safety early warning system is characterized in that a voltage acquisition circuit acquires power distribution network main node data signal voltage, a second voltage acquisition circuit acquires power distribution network node data signal voltage, the delay comparison circuit uses an operational amplifier AR1, an operational amplifier AR2 and a diode D5-a diode D7 to form a peak detection circuit, a peak signal of an output signal of an voltage acquisition circuit is screened and input into an in-phase input end of an operational amplifier AR5, a time delay circuit formed by a triode Q5 and a capacitor C5 is used for delaying the output signal of the second voltage acquisition circuit, the operational amplifier AR5, the diode D5 and the average circuit are used for screening an average signal and inputting into an anti-phase input end of the operational amplifier AR5, the operational amplifier AR5 performs subtraction processing on the signal, wherein the operational amplifier AR5 detects the input end of the operational amplifier AR5, the anti-phase signal output by the operational amplifier AR5, the operational amplifier AR5 and the potential difference signal is fed back to the in-phase input end of the AR5, the operational amplifier AR5, the post-phase signal detection circuit, the potential difference signal is fed back to the filter 5, and the post-phase difference detection circuit, the post-phase signal is fed back to the post-phase signal detection circuit of the operational amplifier 5, the post-phase signal of the operational amplifier 5, the electrical potential difference detection circuit.
2. 2. A power distribution network data safety precaution system as claimed in claim as claimed in claim 1, wherein said delay comparison circuit includes an operational amplifier AR1, an inverting input terminal of the operational amplifier AR1 is connected to an anode of a diode D5 and a terminal of a resistor R5, an output terminal of the operational amplifier AR is connected to a cathode of the diode D , an anode of the diode D and a collector of a transistor Q , a cathode of the diode D is connected to an anode of the diode D and a 360 terminal of the resistor R , another terminal of the resistor R is connected to an another terminal of the operational amplifier R and an inverting input terminal of the operational amplifier Q , a non-inverting input terminal of the operational amplifier D is connected to a cathode of the diode D and a 360 terminal of the resistor R , another terminal of the resistor R is connected to a non-inverting input terminal of the transistor R and a non-inverting input terminal of the transistor R , a resistor R , a non-inverting input terminal of the transistor R , a non-inverting input terminal of the transistor R , a non-inverting input terminal of the transistor R , a non-inverting input terminal , a transistor R , a non-inverting input terminal , a non-emitter of the transistor R , a non-emitter of the transistor.
3. 3. The kind of power distribution network data security early warning system of claim 2, wherein the filtering and transmitting circuit includes an inductor L1, of the inductor L1 is connected with the ends of a resistor R18 and of a capacitor C6, the other of the resistor R18 is connected with the output end of the operational amplifier AR6, the other of the inductor L1 is connected with the of the capacitor C7, the of the resistor R19 and the cathode of a voltage regulator tube D10, the other of the capacitor C6 and the capacitor C7 are connected with ground, the anode of the voltage regulator tube D10 is connected with ground, and the other of the resistor R19 is connected with the signal transmitter E1.
4. 4. kinds of distribution network data security early warning system as claimed in claim 1 or 2, wherein the th voltage acquisition circuit includes voltage collector J1 model PIM600MC, power supply terminal of voltage collector J1 is connected with +5V, ground terminal of voltage collector J1 is connected with ground, output terminal of voltage collector J1 is connected with terminal of resistor R1, another terminal of resistor R1 is connected with terminal of resistor R2 and cathode of diode D1, anode of diode D1 is connected with ground, another terminal of resistor R2 is connected with base of transistor Q1, collector of transistor Q1 is connected with base of transistor Q2 and anode of diode D2, emitter of transistor Q2 is connected with emitter of transistor Q1, cathode of diode D2 is connected with terminal of capacitor C1, another terminal of capacitor C1 is connected with collector of transistor Q2 and non-inverting input terminal of AR 1.
5. 5. The distribution network data safety precaution system of claim 2, wherein the second voltage collection circuit includes a voltage collector J2 of type PIM600MC, a power supply terminal of the voltage collector J2 is connected to +5V, a ground terminal of the voltage collector J2 is connected to ground, an output terminal of the voltage collector J2 is connected to the terminal of the resistor R3, another of the resistor R3 is connected to the terminal of the resistor R4 and the negative terminal of the diode D3, the positive terminal of the diode D3 is connected to ground, another 3 of the resistor R3 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the base of the transistor Q3 and the positive terminal of the diode D3, the emitter of the transistor Q3 is connected to the emitter of the transistor Q3, the negative terminal of the diode D3 is connected to the terminal 3 of the capacitor C3, and the collector of the transistor Q3.

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