A remote control anti-malfunction system

Abstract

The present invention discloses a remote control anti-malfunction system, which is used for controlling the action of a relay of a power distribution terminal, and comprises: a CPU remote control module, a monitoring module and a logic judgment module; the CPU remote control module is used for starting a remote control selection signal and a check signal of a normal working state according to a remote control requirement; the monitoring module is used for collecting the check signal of the normal working state and feeding back the information to the CPU remote control module, and the CPU remote control module outputs a CPU normal operation signal after receiving the feedback information; the logic judgment module is used for outputting a remote control control signal for controlling the action of the relay when the CPU normal operation signal and the remote control selection signal are received at the same time.

Description

Technical Field

[0001] The invention relates to a remote control anti-malfunction system, belonging to the technical field of electric power automation. Background Art

[0002] Among the DTUs (station terminals) and FTUs (feeder terminals) currently used in the market, station terminals are distribution terminals installed in distribution network switch stations, distribution rooms, ring network cabinets, box-type substations, etc., which complete data collection, remote control, local fault action, line loss measurement, communication and other functions. At the same time, they have the ability to receive local primary equipment status monitoring data and analyze and process it. Station terminals can be divided into centralized station terminals and distributed station terminals according to their layout; feeder terminals are distribution terminals installed in distribution network overhead line towers, etc. According to the different electrical quantity collection transformers / sensors of pole-mounted switches, the terminal types are divided into three types according to the interface form with the pole-mounted switches: electromagnetic, electronic and digital.

[0003] In the prior art, most remote control circuits are controlled by the CPU. The existing remote control malfunction protection measures on the market simply require the CPU pins to maintain a certain state. Although they have a certain degree of reliability, in rare cases, for example, when the remote control preparation program has been started and all states are in place, the CPU crashes. At this time, all remote control outputs (more than 32 channels or as few as 4 channels) are in the triggered state. At this time, the monitoring chip detects that the CPU has crashed and restarts the CPU, then all remote controls will malfunction. These devices need to be connected to the national power grid. If a remote control malfunction occurs, the loss will be catastrophic. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a remote control anti-malfunction system.

[0005] In order to solve the above technical problems, the present invention provides a remote control anti-malfunction system for controlling the action of a relay of a power distribution terminal, comprising: a CPU remote control module, a monitoring module and a logic judgment module;

[0006] The CPU remote control module is used to start the remote control selection signal and the normal working state inspection signal according to the remote control demand;

[0007] The monitoring module is used to collect the inspection signal of the normal working state and feed back the information to the CPU remote control circuit. After receiving the feedback information, the CPU remote control circuit outputs a CPU normal operation signal;

[0008] The logic judgment module is used to output a remote control signal for controlling the action of the relay when the CPU normal operation signal and the remote control selection signal are received simultaneously.

[0009] Furthermore, the inspection signal is a square wave signal with a fixed frequency output when the CPU remote control module works normally.

[0010] Furthermore, the monitoring module is used to output a locking signal to the relay when the inspection signal cannot be collected, and the relay is locked and in an uncontrollable state.

[0011] Furthermore, the monitoring module is used to output an unlocking signal to the relay when the inspection signal is collected, so that the relay is unlocked and can be controlled.

[0012] Furthermore, the monitoring module adopts a dual retriggerable monostable multivibrator module.

[0013] Furthermore, the logic judgment module adopts an NOR gate module to receive a CPU normal operation signal and a remote control selection signal, wherein the CPU normal operation signal is a low level signal, the remote control selection signal is a low level signal, and the remote control control signal output by the NOR gate module is a high level signal.

[0014] The beneficial effects achieved by the present invention are:

[0015] The protection measure for remote control malfunction of the present invention requires the CPU pin to output a square wave within a set time, which requires the CPU to keep the program running. Once the program stops running, the square wave will stop. At this time, no matter what state the CPU pin remains in, the remote control will not start, which can prevent the remote control malfunction phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] like Figure 1 As shown, a remote control anti-malfunction system is used to control the action of the relay of the power distribution terminal, including: a CPU remote control module, a monitoring module and a logic judgment module;

[0019] The CPU remote control module is used to start the remote control selection signal and the normal working state inspection signal according to the remote control demand;

[0020] The monitoring module is used to collect the inspection signal of the normal working state and feed back the information to the CPU remote control module. After receiving the feedback information, the CPU remote control module outputs a CPU normal operation signal. In this embodiment, the monitoring module adopts the SN74AHC123AD dual retriggerable monostable multivibrator chip to collect the inspection signal output by the monitoring pin of the CPU remote control module;

[0021] The logic judgment module is used to output a remote control signal for controlling the action of the relay when the CPU normal operation signal and the remote control selection signal are received at the same time. In this embodiment, the logic judgment module adopts a 74LVC1G02DBVR or NOT gate chip to perform logic judgment on the input signal.

[0022] The inspection signal is a square wave signal with a fixed frequency output when the CPU remote control module works normally.

[0023] The monitoring module is used to output a locking signal to the relay when the inspection signal cannot be collected, and the relay is locked and in an uncontrollable state.

[0024] The monitoring module is used to output an unlocking signal to the relay when the inspection signal is collected, so that the relay is unlocked and can be controlled.

[0025] The monitoring module adopts a dual retriggerable monostable multivibrator module.

[0026] The NOT gate module is used to receive a CPU normal operation signal and a remote control selection signal, wherein the CPU normal operation signal is a low level signal, the remote control selection signal is a low level signal, or the remote control signal output by the NOT gate module is a high level signal.

[0027] Working principle of the present invention:

[0028] Among them, YK_WDI is the monitored pin output by the CPU. Only when this pin keeps outputting a fixed frequency square wave, the relay lock state will be released. Together with the remote control selection signal DZ_QD, the relay can be started after being judged by the gate circuit. (The model in the figure is a commonly used model. There are many chips with the same function on the market, which will not be listed one by one).

[0029] The present invention uses a "double retriggerable monostable multivibrator" that needs to provide a fixed frequency square wave to maintain a state to monitor the CPU pin. When the CPU can operate normally, the pin can normally output a square wave, and the "double retriggerable monostable multivibrator" that monitors the pin will release the relay locking state, and the relay is in a controllable state at this time, otherwise the "double retriggerable monostable multivibrator" chip output pin will lock the relay to prevent the relay from operating. The time when the CPU outputs the square wave can be determined by using the "double retriggerable monostable multivibrator" with reference to the capacitor and resistor connected to the pin.

[0030] The invention's protection measure against remote control malfunction is to require that the state of the CPU pin output is constantly changing, and the CPU pin will only keep changing when the program is running normally. Under any uncontrollable circumstances such as when the CPU freezes or starts up, the program cannot run normally, and the CPU pin cannot output the correct change frequency, and the remote control will not operate, thereby protecting the product from remote control malfunctions.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A remote control anti-malfunction system for controlling the action of the relay at the power distribution terminal. It is characterized in that include: CPU remote control module, monitoring module and logic judgment module; The CPU remote control module is used to start the remote control selection signal and the normal working state inspection signal according to the remote control demand; The monitoring module is used to collect the inspection signal of the normal working state and feed back the information to the CPU remote control module. After receiving the feedback information, the CPU remote control module outputs a CPU normal operation signal; The logic judgment module is used to output a remote control signal for controlling the action of the relay when receiving a CPU normal operation signal and a remote control selection signal at the same time; The inspection signal is a square wave signal with a fixed frequency output when the CPU remote control module works normally; The monitoring module is used to output a locking signal to the relay when the inspection signal cannot be collected, and the relay is locked and in an uncontrollable state.

2. The remote control anti-malfunction system according to claim 1, It is characterized in that The monitoring module is used to output an unlocking signal to the relay when the inspection signal is collected, so that the relay is unlocked and can be controlled.

3. The remote control anti-malfunction system according to claim 2, It is characterized in that The monitoring module adopts a dual retriggerable monostable multivibrator module.

4. The remote control anti-malfunction system according to claim 1, It is characterized in that The logic judgment module adopts an NOR gate module to receive a CPU normal operation signal and a remote control selection signal, wherein the CPU normal operation signal is a low level signal, the remote control selection signal is a low level signal, and the remote control control signal output by the NOR gate module is a high level signal.

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