Secondary operation and maintenance regular inspection hard contact signal intelligent point alignment device and method

Abstract

The invention relates to the technical field of insulator relay protection, and provides an intelligent counter-point device and method for a secondary operation and maintenance regular check hard contact signal, and a host is located in the hand of an operator, is equipped with a touch display screen, is used for displaying the states of an input contact and an output contact in real time, and is provided with an output short-circuit button. And information interaction is carried out between the host and the slave through wireless communication. And the slave input detection module and the slave output contact module of the slave are connected to a terminal needing to be detected through banana plugs. An operator can press down a corresponding button through a switch-out button when a certain switch-out contact needs to be switched on, and the slave machine executes corresponding operation according to an instruction and switches on a corresponding slave machine switch-out contact module. A slave input detection module and a slave output contact module of the slave can send detected input contact conduction signals to the host in a wireless mode, and an operator can check the signal state on the host in real time. An operator can complete the test work only in front of the screen cabinet, and the efficiency of the detection work is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary equipment detection in power systems, and in particular to an intelligent point-to-point device and method for secondary operation and maintenance inspection hard-connection point signals. Background Art

[0002] In order to ensure the safe, stable and efficient operation of the power system, it is necessary to conduct secondary inspections at the substation site to promptly discover and deal with faults and hidden dangers, avoid unexpected power outages, and improve power supply reliability. The secondary inspections at the substation site mainly verify the hard contact signals by manually removing and resetting the action signals, that is, during operation, a certain action signal is removed, and then short-circuited and sent after restoration, and the remote signal status signal is verified by short-circuiting. Although this traditional method has been applied in practice, it has many disadvantages: 1. Risks of removing signal loops Since the secondary circuit usually operates with power on, removing the energized action signal may cause the DC system to be grounded, which may cause the circuit breaker to malfunction or fail to operate, thus seriously threatening the safe operation of the power grid.

[0003] 2. Risk of misoperation during nighttime operation During nighttime maintenance, due to insufficient light, operators may make mistakes in identifying the voltage level and wiring status of the equipment, increasing the probability of misoperation. When using the short-circuit method to check the signal, if the operator makes a mistake, the high-voltage circuit may be mistakenly connected, causing a short circuit, causing the circuit breaker to trip or equipment damage, increasing the difficulty and cost of equipment maintenance.

[0004] 3. Accuracy issues in repeated disconnection Traditional methods require operators to frequently connect and disconnect, which can easily cause fatigue, reduce concentration, and increase the possibility of incorrect wiring. When reconnecting after disconnection, it is easy to cause the wiring to be not restored properly or incorrectly due to multiple operations, resulting in faults such as virtual connection or open circuit, affecting the stability of the power system and the reliability of the equipment.

[0005] Based on this, the present invention provides a secondary operation and maintenance inspection hard contact signal intelligent point-to-point device and method to reduce the risk of DC grounding and short circuit, ensure personnel safety, improve signal verification efficiency, reduce equipment loss and maintenance costs, and improve power grid stability. Summary of the invention

[0006] The purpose of the present invention is to address the deficiencies in the prior art and to provide a secondary operation and maintenance inspection hard-connect signal intelligent point-to-point device and method to reduce the risks of DC grounding and short circuit, ensure personnel safety, improve signal verification efficiency, reduce equipment loss and maintenance costs, and improve power grid stability.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A secondary operation and maintenance fixed inspection hard contact signal intelligent point-to-point device, comprising: a control module, an input detection module, an output contact module, a human-machine interaction module and a power module; the control module is electrically connected to the input detection module, the output contact module, the human-machine interaction module and the power module respectively; the power module is electrically connected to the control module, the input detection module, the output contact module and the human-machine interaction module respectively; The input end of the input detection module is electrically connected to the input terminal block, and the output is electrically connected to the control module; the input detection module is used to electrically isolate the input signal of the detection terminal block, detect the input signal value and transmit it to the control module; The output contact module input is electrically connected to the control module, and the output end is electrically connected to the output terminal block; the output contact module is used to connect the corresponding output terminal to the DC power supply under the control of the control module, and the output contact module is provided with a short-circuit protection circuit; The human-computer interaction module is used to input control instructions, display input detection signals, and output information of the output contact module; The control module is used to control the output terminals of the output contact module to be turned on according to the instructions output by the human-computer interaction module, and to display the information output by the input detection module through the human-computer interaction module after processing.

[0008] Preferably, the input detection module includes: a signal detection circuit and an isolated voltage-stabilized power supply circuit; the signal detection circuit includes: an operational amplifier U7, resistors R8-R20, and capacitors C9-C12, wherein pin 1 of the operational amplifier U7 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pin 2 is connected to the input terminal V1, and pin 3 is grounded, resistors R8-R12 are connected in series between pin 2 and V1 in sequence, resistor R20, capacitors C9 and C10 are connected in parallel between the right end of resistor R12 and pin 3 in sequence, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R13, and the other end of resistor R13 is connected to the control module, a capacitor C12 is provided between the end of resistor R13 away from pin 7 and the ground, pins 5 and 6 are grounded, and a capacitor C11 is provided between pin 8 and the ground; the input and output of the isolated voltage-stabilized power supply circuit are both 5V, and the input detection module can detect several input terminal output signals.

[0009] Preferably, the open contact module includes: a DC power supply output circuit and an anti-short circuit; the DC power supply output circuit includes: a relay and a relay drive circuit; the relay drive circuit input is the control module output signal, the relay drive circuit output is connected to one end of the relay control coil, the other end of the relay control coil is connected to a 5V power supply, one end of the relay switch is connected to the DC power supply, the other end of the relay switch is connected to the open input terminal, and the DC power supply output circuit is used to control the corresponding open output terminal to be connected to the DC power supply under the control of the control module; the anti-short circuit is connected in series between the DC power supply output circuit and the DC power supply, and the anti-short circuit is a resistor.

[0010] Preferably, the DC power supply output circuit controls 20 output terminals to be connected to the DC power supply.

[0011] Preferably, the anti-short circuit includes: a resistor P1, a relay RLY1, and a voltage detection circuit. The resistor P1 is connected in series between the DC power supply output circuit and the DC power supply. The relay RLY1 switch is connected in parallel at both ends of the resistor P1. One end of the relay RLY1 control coil is connected to the control module output, and the other end is connected to the 5V power supply. The voltage detection circuit detects the voltage across the resistor P1 and outputs the detected voltage signal to the control module.

[0012] Preferably, the voltage detection circuit includes: a voltage-stabilized power supply circuit and a detection circuit; the detection circuit includes: an operational amplifier U5, resistors R1-R7, and capacitors C2-C5, wherein pin 1 of the operational amplifier U5 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pins 2 and pin 3 are respectively connected to both ends of resistor P1, resistors R1-R5 are connected in series between pin 2 and resistor P1, resistor R7, capacitors C2 and C3 are connected in parallel between the right end of resistor R5 and pin 3, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R6, and the other end of resistor R6 is connected to a control module, a capacitor C5 is provided between the end of resistor R6 away from pin 7 and the ground, pins 5 and 6 are grounded, and a capacitor C4 is provided between pin 8 and the ground; the input and output of the voltage-stabilized power supply circuit are both 5V.

[0013] Preferably, the control module includes: single-chip microcomputers U21, U22 and other peripheral auxiliary circuits; the single-chip microcomputer U21 is used to analyze and control 20-way input signals and 20-way output signals, control the output terminals of the output contact module to be turned on according to the instructions output by the human-computer interaction module, and display the information output by the input detection module through the human-computer interaction module after processing; the single-chip microcomputer U22 is used for the detection and A / D conversion of some input voltage signals; the peripheral auxiliary circuits include: a clock circuit, a reset circuit and a power supply circuit.

[0014] Preferably, the single chip microcomputer U22 communicates with U21 via the serial port USART1.

[0015] Another object of the present invention is to provide a method for intelligently aligning hard-connection point signals for secondary maintenance and inspection, comprising the following steps: S1, line connection, connect the input terminal and the output terminal with the corresponding secondary equipment terminal through the connecting wire, after the connection is completed, turn on the secondary operation and maintenance fixed inspection hard contact signal intelligent point-to-point device, and the control module initializes the device; S2, input signal detection, through the input detection module, the signal input from the input terminal is isolated and reduced in voltage, after the voltage divider network and filtering, the signal is transmitted to the control module for processing, and displayed through the human-computer interaction module; S3, outputting the DC power supply. When a certain output terminal is selected to be connected to the DC power supply through the human-computer interaction module, the control module receives the command to control the corresponding output terminal to be connected to the DC power supply, and at the same time starts the short-circuit protection circuit to detect the voltage across the resistor P1; If the detection result is within the safety range, the control module controls the relay RLY1 switch to close; if the detection result is not within the safety range, the control module controls the relay RLY1 switch to open, and displays an alarm message on the human-computer interaction module; S4. After the test is completed, remove the connecting wires and turn off the secondary operation and maintenance inspection hard-connect signal intelligent point-to-point device.

[0016] The present invention discloses an intelligent point-to-point device and method for secondary operation and maintenance fixed inspection hard-connection point signals, which have the following beneficial effects.

[0017] The present invention can improve operational safety and reduce the risks of DC grounding and short circuits: signal verification is achieved without disconnecting or short-circuiting the circuit, thus avoiding the risk of DC grounding caused by misoperation in traditional methods. Personnel safety is ensured. The electrical isolation of the input signal and the control circuit is ensured by isolating the amplifier circuit, and the safety of the operator can still be guaranteed in a high-voltage environment. Work efficiency is improved, and signal verification efficiency is improved: the time for repeated operations is reduced. The device does not need to disconnect the wiring, which not only reduces the error rate, but also improves work continuity. Economic benefits, reducing equipment loss and maintenance costs: misoperation in traditional short-circuiting methods may cause the switch to trip or equipment to be damaged. The probability of equipment damage is reduced, operating costs are reduced, the need for manual participation is reduced, and labor costs are reduced. The stability of the power grid is improved. By reducing the misoperation or refusal of the circuit breaker caused by misoperation, the device can significantly improve the stability and safety of the power grid system, reduce power outages, and improve power supply reliability. . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system block diagram of the secondary operation and maintenance inspection hard-connect signal intelligent point-to-point device of the present invention.

[0019] Figure 2 This is a schematic diagram of the control module circuit of the present invention.

[0020] Figure 3 It is a partial circuit schematic diagram of the open-in detection module of the present invention.

[0021] Figure 4 It is a partial circuit schematic diagram of the open contact module of the present invention.

[0022] Figure 5 It is a partial circuit schematic diagram of the open contact module of the present invention.

[0023] In the attached figure: 1. control module; 2. input detection module; 3. output contact module; 4. human-computer interaction module; 5. power supply module. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0026] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0027] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0028] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. Example 1

[0029] Please refer to Figure 1 , a secondary operation and maintenance fixed inspection hard contact signal intelligent point-to-point device, comprising: a control module 1, an input detection module 2, an output contact module 3, a human-machine interaction module 4 and a power module 5; the control module 1 is electrically connected to the input detection module 2, the output contact module 3, the human-machine interaction module 4 and the power module 5 respectively; the power module 5 is electrically connected to the control module 1, the input detection module 2, the output contact module 3, and the human-machine interaction module 4 respectively; The input end of the input detection module 2 is electrically connected to the input terminal block, and the output is electrically connected to the control module 1; the input detection module 2 is used to electrically isolate the input signal of the detection terminal block, detect the input signal value and transmit it to the control module 1; The input of the output contact module 3 is electrically connected to the control module 1, and the output end is electrically connected to the output terminal block; the output contact module 3 is used to connect the corresponding output terminal to the DC power supply under the control of the control module 1, and the output contact module 3 is provided with a short-circuit protection circuit; The human-computer interaction module 4 is used to input control instructions, display input detection signals, and output information of the output contact module 3; The control module 1 is used to control the output terminal of the output contact module 3 to be turned on according to the instruction output by the human-computer interaction module 4, and to display the information output by the input detection module 2 through the human-computer interaction module 4 after processing.

[0030] Please refer to Figure 3, the input detection module 2 includes: a signal detection circuit and an isolated voltage-stabilized power supply circuit; the signal detection circuit includes: an operational amplifier U7, resistors R8-R20, and capacitors C9-C12. Pin 1 of the operational amplifier U7 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pin 2 is connected to the input terminal V1, pin 3 is grounded, resistors R8-R12 are connected in series between pins 2 and V1, resistors R20, capacitors C9 and C10 are connected in parallel between the right end of resistor R12 and pin 3, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R13, and the other end of resistor R13 is connected to the control module 1. A capacitor C12 is arranged between the end of resistor R13 away from pin 7 and the ground, pins 5 and 6 are grounded, and a capacitor C11 is arranged between pin 8 and the ground; the operational amplifier U7 adopts an AMC1200 isolation amplifier. In this circuit, the input is a DC +110V signal V1. The high voltage signal is reduced to a range suitable for the AMC1200 input through the resistor divider network R8-R12 of the previous stage. The AMC1200 isolates and amplifies the differential signal and outputs it to the subsequent circuit. VOUTP and VOUTN are the amplified differential output signals. After passing through the filter capacitors C11 and C12, they are output to V1_ADC for subsequent processing.

[0031] The input and output of the isolated voltage-stabilized power supply circuit are both 5V. The input detection module can detect the output signals of several open input terminals. In this embodiment, the signal detection circuit includes a total of 20, and the principle is the same; the isolated voltage-stabilized power supply circuit adopts an isolated voltage-stabilized power supply module 5. Through the isolated power supply, there is electrical isolation between the input and output ends, which is very important in a high-voltage environment and can ensure the safety of the control circuit and the signal processing part. Capacitors C7 and C8 are used for filtering to reduce noise and ripple in the power supply to ensure the stability of the output voltage. The electrical isolation between the high-voltage part of the input and the low-voltage part of the output is guaranteed by the isolated voltage-stabilized power supply module 5 and the AMC1200 isolation amplifier. Protect the control module 1 from high-voltage shocks.

[0032] Please refer to Figure 4 and Figure 5 , the output contact module 3 includes: a DC power supply output circuit and an anti-short circuit; the DC power supply output circuit includes: a relay and a relay driving circuit; the relay driving circuit input is the output signal of the control module 1, the relay driving circuit output is connected to one end of the relay control coil, the other end of the relay control coil is connected to the 5V power supply, and one end of the relay switch is connected to the DC power supply. It should be noted that in this embodiment, the DC power supply is input from the secondary circuit, the other end of the relay switch is connected to the input terminal, and the DC power supply output circuit is used to control the corresponding output terminal to be connected to the DC power supply under the control of the control module 1; the anti-short circuit is connected in series between the DC power supply output circuit and the DC power supply, and the anti-short circuit is a resistor, that is, the resistor P1 is connected in series between the DC power supply output circuit and the DC power supply.

[0033] In this embodiment, the relay driving circuit includes: Darlington tube driving chip U1-U3, the high and low level signals output from the control module 1 are input from the J1-J20 terminals of U1-U3, and are output from JO1-JO20 after being amplified by the Darlington tube driving chip U1-U3; there are 20 relays and corresponding output terminals, and the relays are K1-K20 in sequence, and the JO1-JO20 output drives the relay K1-K20 to operate, and then connected to the terminals required by the user through the CN1 and CN2 terminal rows, and the DC power supply output circuit controls the 20 output terminals to be connected to the DC power supply, so as to realize the connection between the corresponding output terminals and the DC power supply. Example 2

[0034] Based on Example 1, please refer to Figure 4 and Figure 5 , this embodiment provides an anti-short circuit including: a resistor P1, a relay RLY1, and a voltage detection circuit. The resistor P1 is connected in series between the DC power supply output circuit and the DC power supply. The relay RLY1 switch is connected in parallel at both ends of the resistor P1. One end of the control coil of the relay RLY1 is connected to the output of the control module 1, and the other end is connected to the 5V power supply. The voltage detection circuit detects the voltage across the resistor P1 and outputs the detected voltage signal to the control module 1. The voltage detection circuit of the control module 1 detects the voltage across the resistor P1, and the current generated after the opening can be calculated. The control module 1 analyzes the current and voltage of the resistor. If it is within the normal range, it can output a drive signal to close the RLY1 relay, and short-circuit the resistor P1 to make the opening signal open normally. If it is not within the normal range, the control module 1 does not output the RLY1 drive signal, RLY1 will not be closed, and no short circuit will be caused. The control module 1 sends an alarm message to the corresponding position of the LCD screen for prompting.

[0035] It is worth noting that if the resistor P1 is permanently connected in series between the DC power supply output circuit and the DC power supply, if the load carried by the output terminal is slightly larger, the voltage drop on the resistor P1 will be relatively large, which may cause the load to malfunction. The present application avoids this problem by detecting the voltage through the control module 1 and then calculating the current generated after the output. If the load is normal, the resistor P1 will be short-circuited after closing the RLY1 relay, which can avoid the DC power supply output voltage drop and supply the load with the original voltage amplitude.

[0036] The voltage detection circuit includes: a voltage-stabilized power supply circuit and a detection circuit; the detection circuit includes: an operational amplifier U5, resistors R1-R7, and capacitors C2-C5, wherein pin 1 of the operational amplifier U5 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pins 2 and 3 are respectively connected to both ends of resistor P1, resistors R1-R5 are connected in series between pin 2 and resistor P1, resistor R7, capacitors C2 and C3 are connected in parallel between the right end of resistor R5 and pin 3, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R6, and the other end of resistor R6 is connected to control module 1, a capacitor C5 is arranged between the end of resistor R6 away from pin 7 and ground, pins 5 and 6 are grounded, and a capacitor C4 is arranged between pin 8 and ground; the input and output of the voltage-stabilized power supply circuit are both 5V. Example 3

[0037] Based on Example 1, please refer to Figure 2 , this embodiment provides a control module 1 including: single-chip microcomputers U21, U22 and other peripheral auxiliary circuits; single-chip microcomputer U21 is used to analyze and control 20-way input signals and 20-way output signals, and control the output terminal of the output contact module 3 to be turned on according to the instructions output by the human-computer interaction module 4, and display the information output by the input detection module 2 through the human-computer interaction module 4 after processing; single-chip microcomputer U22 is used for detection and A / D conversion of part of the input voltage signal; peripheral auxiliary circuits include: clock circuit, reset circuit and power supply circuit. In this embodiment, single-chip microcomputer U21 is the core processing unit, responsible for managing and controlling the 20-way input signals V1_ADC-V20_ADC and the 20-way output signals to be output through the J1-J20 ports.

[0038] The functions of U21 include not only signal acquisition and processing, but also the realization of various logic control functions through programming.

[0039] U21 communicates with the human-computer interaction module 4 through the serial port USART3 to realize the human-computer interaction function. The user can set and operate instructions through the human-computer interaction module.

[0040] U22 - Auxiliary MCU chip: The main task of U22 is to detect and A / D convert a part of the input voltage signal. The input signal it processes is converted through its own ADC module.

[0041] U22 communicates with U21 through serial port USART1, and sends the converted data to U21 for unified processing and management.

[0042] Signal Processing: The input detection signal is input from V1_ADC to V20_ADC and enters the MCU for collection. U21 and U22 work together to complete the detection and processing of 20 input signals. U22 is responsible for part of it, while U21 is responsible for comprehensive processing.

[0043] The open contact signal is output from ports J1-J20, and U21 controls the output of each signal.

[0044] Power module 5: The power module 5 uses the U23 module to convert the +5V power supply to +3.3V to supply the U21 and U22 MCU chips, and also supply other modules for practical use.

[0045] Clock circuit: The clock circuit is composed of X1 crystal oscillator and related capacitors, which provide the clock source for the MCU chip to ensure that the chip runs normally at the set frequency.

[0046] Reset circuit: The reset circuit includes the NRST pin and related capacitors, which are used to reset the MCU to ensure that the system can be restored to its initial state when needed.

[0047] The two MCU chips work together. U21, as the main control chip, is responsible for the acquisition and processing of 20 input signals and the control of 20 output signals. At the same time, it realizes user control through the serial port and human-computer interaction module 4. U22 assists U21 in processing some input signals and performing A / D conversion, and transmits data to U21 through the serial port to achieve more efficient signal processing and control. The entire system realizes various complex control functions through C language programming, and ensures reliable operation of the system through stable power supply and clock circuit. Example 4

[0048] Based on embodiments 1-3, this embodiment provides a method for testing a hard contact point signal intelligent point device during secondary operation and maintenance inspection, including the following steps: S1, line connection, connect the input terminal and the output terminal with the corresponding secondary equipment terminal through the connecting wire, after the connection is completed, turn on the secondary operation and maintenance fixed inspection hard contact signal intelligent point-to-point device, and control module 1 initializes the device; S2, input signal detection, through the input detection module 2, the signal input from the input terminal is isolated and reduced in voltage, after the voltage divider network and filtering processing, the signal is transmitted to the control module 1 for processing, and displayed through the human-computer interaction module 4; S3, outputting the DC power supply. When a certain output terminal is selected to be connected to the DC power supply through the human-machine interaction module 4, the control module 1 receives the command to control the corresponding output terminal to be connected to the DC power supply, and at the same time starts the short-circuit protection circuit to detect the voltage across the resistor P1; If the detection result is within the safety range, the control module 1 controls the relay RLY1 switch to close; if the detection result is not within the safety range, the control module 1 controls the relay RLY1 switch to open, and displays an alarm message on the human-computer interaction module 4; S4. After the test is completed, remove the connecting wires and turn off the secondary operation and maintenance inspection hard-connect signal intelligent point-to-point device.

[0049] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be a substitution of a part of the structure, device, method step, or a complete technical solution. The equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A secondary maintenance and inspection hard contact signal intelligent point-to-point device, characterized in that: include: A control module, an input detection module, an output contact module, a human-computer interaction module and a power module; the control module is electrically connected to the input detection module, the output contact module, the human-computer interaction module and the power module; the power module is electrically connected to the control module, the input detection module, the output contact module and the human-computer interaction module; The input end of the input detection module is electrically connected to the input terminal block, and the output is electrically connected to the control module; the input detection module is used to electrically isolate the input signal of the detection terminal block, detect the input signal value and transmit it to the control module; The output contact module input is electrically connected to the control module, and the output end is electrically connected to the output terminal block; the output contact module is used to connect the corresponding output terminal to the DC power supply under the control of the control module, and the output contact module is provided with a short-circuit protection circuit; The human-computer interaction module is used to input control instructions, display input detection signals, and output information of the output contact module; The control module is used to control the output terminals of the output contact module to be turned on according to the instructions output by the human-computer interaction module, and to display the information output by the input detection module through the human-computer interaction module after processing.

2. The secondary operation and maintenance inspection hard-connection signal intelligent point-to-point device according to claim 1, characterized in that: The open-in detection module includes: a signal detection circuit and an isolated voltage-stabilized power supply circuit; the signal detection circuit includes: an operational amplifier U7, resistors R8-R20, and capacitors C9-C12, wherein pin 1 of the operational amplifier U7 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pin 2 is connected to an open-in terminal V1, and pin 3 is grounded. Resistors R8-R12 are connected in series between pins 2 and V1 in sequence, and resistor R20, capacitors C9 and C10 are connected in parallel between the right end of resistor R12 and pin 3 in sequence, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R13, and the other end of resistor R13 is connected to a control module, and a capacitor C12 is provided between the end of resistor R13 away from pin 7 and the ground, pins 5 and 6 are grounded, and a capacitor C11 is provided between pin 8 and the ground; the input and output of the isolated voltage-stabilized power supply circuit are both 5V, and the open-in detection module can detect a number of open-in terminal output signals.

3. The secondary operation and maintenance inspection hard-connection signal intelligent point-to-point device according to claim 1, characterized in that: The output contact module includes: a DC power supply output circuit and an anti-short circuit; the DC power supply output circuit includes: a relay and a relay drive circuit; the relay drive circuit input is the control module output signal, the relay drive circuit output is connected to one end of the relay control coil, the other end of the relay control coil is connected to a 5V power supply, one end of the relay switch is connected to the DC power supply, the other end of the relay switch is connected to the input terminal, and the DC power supply output circuit is used to control the corresponding output terminal to be connected to the DC power supply under the control of the control module; the anti-short circuit is connected in series between the DC power supply output circuit and the DC power supply, and the anti-short circuit is a resistor.

4. The secondary operation and maintenance inspection hard-connection signal intelligent point-to-point device according to claim 3, characterized in that: The DC power supply output circuit controls 20 output terminals to be connected to the DC power supply.

5. The intelligent point-to-point device for secondary maintenance and inspection of hard-connection signals according to claim 3, characterized in that: The anti-short circuit includes: a resistor P1, a relay RLY1, and a voltage detection circuit. The resistor P1 is connected in series between the DC power supply output circuit and the DC power supply. The relay RLY1 switch is connected in parallel at both ends of the resistor P1. One end of the relay RLY1 control coil is connected to the control module output, and the other end is connected to the 5V power supply. The voltage detection circuit detects the voltage across the resistor P1 and outputs the detected voltage signal to the control module.

6. The secondary operation and maintenance inspection hard-connection signal intelligent point-to-point device according to claim 5, characterized in that: The voltage detection circuit includes: a voltage-stabilized power supply circuit and a detection circuit; the detection circuit includes: an operational amplifier U5, resistors R1-R7, and capacitors C2-C5, wherein pin 1 of the operational amplifier U5 is connected to a 5V power supply, pins 3 and 4 are short-circuited, pins 2 and pin 3 are respectively connected to both ends of resistor P1, resistors R1-R5 are connected in series between pin 2 and resistor P1, resistor R7, capacitors C2 and C3 are connected in parallel between the right end of resistor R5 and pin 3, pin 8 is connected to a 3.3 V power supply, pin 7 is connected to one end of resistor R6, and the other end of resistor R6 is connected to a control module, a capacitor C5 is provided between the end of resistor R6 away from pin 7 and the ground, pins 5 and 6 are grounded, and a capacitor C4 is provided between pin 8 and the ground; the input and output of the voltage-stabilized power supply circuit are both 5V.

7. The secondary operation and maintenance inspection hard-connection signal intelligent point-to-point device according to claim 1, characterized in that: The control module includes: single-chip microcomputers U21, U22 and other peripheral auxiliary circuits; the single-chip microcomputer U21 is used to analyze and control 20-way input signals and 20-way output signals, and controls the output terminals of the output contact module to be turned on according to the instructions output by the human-computer interaction module, and displays the information output by the input detection module through the human-computer interaction module after processing; the single-chip microcomputer U22 is used for the detection and A / D conversion of some input voltage signals; the peripheral auxiliary circuits include: a clock circuit, a reset circuit, and a power supply circuit.

8. The intelligent point-to-point device for secondary maintenance and inspection of hard-connection signals according to claim 1, characterized in that: The microcontrollers U22 and U21 communicate via the serial port USART1.

9. A method for intelligently aligning hard-connection signals for secondary maintenance and scheduled inspection, using the intelligent aligning device for hard-connection signals for secondary maintenance and scheduled inspection as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, line connection, connect the input terminal and the output terminal with the corresponding secondary equipment terminal through the connecting wire, after the connection is completed, turn on the secondary operation and maintenance fixed inspection hard contact signal intelligent point-to-point device, and the control module initializes the device; S2, input signal detection, through the input detection module, the input signal of the input terminal is isolated and reduced in voltage, after the voltage divider network and filtering, the signal is transmitted to the control module for processing, and displayed through the human-computer interaction module; S3, outputting the DC power supply. When a certain output terminal is selected to be connected to the DC power supply through the human-computer interaction module, the control module receives the command to control the corresponding output terminal to be connected to the DC power supply, and at the same time starts the anti-short circuit to detect the voltage across the resistor P1. If the detection result is within the safe range, the control module controls the relay RLY1 switch to close; if the detection result is not within the safe range, the control module controls the relay RLY1 switch to open, and displays an alarm message on the human-computer interaction module; S4. After the test is completed, remove the connecting wires and turn off the secondary operation and maintenance inspection hard-connect signal intelligent point-to-point device.

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