CN103066550B - Low voltage switch decompression reclosure control power transmission detection method and device - Google Patents

Abstract

The invention relates to a detection method and device for controlling power transmission, in particular to a method and device for detecting power transmission under voltage loss and reclosing control of a low-voltage switch. A key input module, a DI module, a display module and a relay output module, the control key input module is connected to the keys arranged on the front of the casing, the display module is connected to the LCD display on the front of the casing, and the buttons are arranged under the LCD display , There are connecting terminals on the back of the casing, and the connecting terminals correspond to the bus voltage input signal module, DI module and relay output module. The invention performs reclosing by detecting the voltage loss of the power supply of the reclosing controller and the busbar voltage input signal and the state of the controlled low-voltage switch being in the position, and can set the delay time for automatic closing control, which reduces the labor intensity of the staff and improves power supply reliability.

Description

Low-voltage switch loss of voltage reclosing control power transmission detection method and device

technical field

The invention relates to a detection method and device for controlling power transmission, in particular to a method and device for detecting power transmission under voltage loss and reclosing control of a low-voltage switch.

Background technique

Due to the safety problem of the power grid, when the transformer is put into operation, it is required to disconnect the load it carries. Therefore, the outlet switches on the low-voltage side have the function of tripping when the power is lost. When the line fails and recloses successfully, the low-voltage outgoing lines of the system are all disconnected due to the instantaneous loss of line voltage. When the power supply is restored, the staff needs to send power to each power distribution room and each outgoing line one by one. It takes up to 2-3 hours, which increases the labor intensity of the staff, prolongs the power outage time, and reduces the reliability of power supply.

Contents of the invention

Based on the deficiencies of the prior art above, the technical problem to be solved by the present invention is to provide a low-voltage switch loss-of-voltage reclosing control power transmission detection method and device that overcomes the above-mentioned defects, has low work intensity, short power outage time, and high reliability.

The technical solution adopted by the present invention to solve its technical problems is:

The low-voltage switch reclosing control power transmission detection method is characterized in that: the reclosing control is performed by detecting the power supply of the reclosing control device and the bus voltage input signal losing voltage and the controlled low-voltage switch being in a sub-position state;

The specific steps are:

Step 1: Connect the low-voltage switch reclosing control device to the circuit, and detect the reclosing controller power supply;

Step 2: The controller directly takes the power signal from the low-voltage busbar, and detects the busbar voltage when the busbar resumes power supply or the incoming line fails and recloses successfully;

Step 3: Start timing after detecting that the bus voltage is normal. After the set time is reached, detect that the circuit breaker is in the off position, the handcart is in the "working" position, and the controller outputs a closing pulse signal.

The low-voltage switch loss-of-voltage reclosing control power transmission device includes a casing, and a single-chip microcomputer is arranged inside the casing, and the single-chip microcomputer is connected to a bus voltage input signal module, a control button input module, a DI module, a display module and a relay output module. The control button input module is connected to the buttons set on the front of the casing, the display module is connected to the LCD display on the front of the casing, the buttons are set under the LCD display, and the wiring terminals are set on the back of the casing, and the wiring terminals are connected to the bus voltage input signal module , DI module corresponds to the relay output module.

The casing is made of plastic, which is light in weight, low in cost, and good in insulation. It adopts a single-chip microcomputer, which has high economical efficiency, strong anti-interference ability, fast computing speed, fewer welding points, and multiple functions; two switch input DI It can monitor the position of the handcart and the status of the circuit breaker in real time. It can display the running status, the position of the handcart and the status of the circuit breaker in real time through the LCD. It can also set various instrument parameters, and it will not be lost when the power is off. It has high reliability and safety. Performance and practicability; the low-voltage switch loss-voltage reclosing controller has a delay reclosing function, and the delay time can be set with buttons and displayed on the LCD screen.

The connecting terminals U1, U2 and U3 are respectively connected to the A phase voltage L1 line, the B phase voltage L2 line and the C phase voltage L3 line through the fuse, the connecting terminal UN is connected to the N line, the connecting terminal N is connected to the N line, and the connecting terminal L is connected to the N line. Connect the C-phase voltage L3 after passing through the fuse, the terminal PE is grounded, the terminal DI1 is connected to the circuit breaker and then connected to the DI common port COM port, the terminal DI2 is connected to the handcart position and then connected to the DI common port COM port, and the relay output terminal is connected to the terminal DOI-1 is connected to the closing coil through the input/exit switch and then connected to the N line, and the relay output terminal DOI-2 is connected to the C-phase voltage L3 line through the resistor. After being connected to the main circuit, after the low-voltage switch in the power distribution room loses voltage, the switch can be reclosed after the power is called again, which reduces the labor intensity of the staff, shortens the power outage time, and improves the reliability of the power supply.

The single-chip microcomputer adopts C8051F340. The C8051F340 device is a fully integrated mixed-signal system-on-chip MCU with fast running speed, convenient debugging, low cost and short development cycle.

Heat dissipation holes are arranged on the upper surface and the lower surface of the casing. There are cooling holes on the top and bottom of the casing to ensure the heat loss of the controller when the work is hot, improve work efficiency and prolong the service life.

The keys include four keys of F1, F2, F3 and F4. Input functions such as entry, exit, shift, and confirmation to the controller by setting buttons.

The beneficial effects of the present invention are: the low-voltage switch loss-of-voltage reclosing control power transmission detection method and the device casing adopt a plastic casing, which is light in weight, low in cost and good in insulation; Convenient, low cost, short development cycle, real-time monitoring of handcart position and circuit breaker status by setting 2 switch input DIs, real-time display of running status, handcart position and circuit breaker status through LCD, and various instruments can also be set The parameters will not be lost even when power is off, and have high reliability, safety and practicability; cooling holes are set on the upper and lower sides of the casing to ensure the heat dissipation of the controller when the work is hot, improve work efficiency and prolong the service life. The invention can perform automatic switch-on control, set the delay time, reduce the labor intensity of staff, improve the reliability of power supply, and effectively guarantee the reliable power consumption of resident users.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the present invention;

Fig. 2 is the front view of the present invention;

Fig. 3 is the back view of the present invention;

Fig. 4 is a circuit connection diagram of the present invention.

Among them: 1. Case 2. LCD display 3. Button 4. Wiring terminal 5. Closing coil 6. Circuit breaker 7. Handcart position 8. Input/exit switch.

detailed description

Embodiments of the present invention are further described below in conjunction with accompanying drawings:

The low-voltage switch reclosing control power transmission detection method is to perform reclosing control by detecting the loss of voltage of the reclosing controller power supply and the bus voltage input signal and the controlled low-voltage switch being in the sub-position state;

The specific steps are:

Step 1: Connect the low-voltage switch reclosing control device to the circuit, and detect the reclosing controller power supply;

Step 2: The controller directly takes the power signal from the low-voltage busbar, and detects the busbar voltage when the busbar resumes power supply or the incoming line fails and recloses successfully;

Step 3: Start timing after detecting that the bus voltage is normal. After the set time is reached, detect that the circuit breaker is in the off position, the handcart is in the "working" position, and the controller outputs a closing pulse signal.

As shown in Figure 1-3, the power transmission device for low-voltage switch reclosing control control includes casing 1, and a single-chip microcomputer is installed inside the casing 1, and the single-chip computer is connected to the bus voltage input signal module, control button input module, DI module, display module and The relay output module, the control button input module is corresponding to the button 3 arranged on the front of the casing, the display module is connected to the LCD display 2 on the front of the casing, the button 3 is arranged under the LCD display 2, and the back of the casing is provided with Connecting terminal 4, connecting terminal 4 corresponds to the bus voltage input signal module, DI module and relay output module.

As shown in Figure 4, the connecting terminals U1, U2 and U3 are respectively connected to the A-phase voltage L1 line, the B-phase voltage L2 line and the C-phase voltage L3 line through the fuse, the connecting terminal UN is connected to the N line, and the connecting terminal N is connected to the N line, terminal L is connected to C-phase voltage L3 after passing through the fuse, terminal PE is grounded, terminal DI1 is connected to circuit breaker 6 and then connected to DI common port COM port, terminal DI2 is connected to handcart position 7 and then connected to DI common port COM port, relay output terminal DOI-1 is connected to the closing coil 5 through the input/exit switch and then connected to the N line, and the relay output terminal DOI-2 is connected to the C-phase voltage L3 line through the resistor.

The single-chip microcomputer adopts C8051F340, and cooling holes are arranged on the top of the casing 1 and the bottom of the casing 1, and the button 3 has four buttons of F1, F2, F3 and F4.

Working principle and usage process:

When using, first set the closing delay time and pulse delay time by pressing the keys F1-F4, then connect the controller to the circuit, the controller directly takes the power signal from the low-voltage bus, and restores the power supply at the bus or the incoming line occurs When the fault recloses successfully, the controller detects the bus voltage and starts timing after the voltage is normal. After the set time is reached, and the detection circuit breaker is in the disconnected position and the handcart is in the "working" position, the controller outputs a closing pulse signal. If the circuit breaker is in the "closed" state or the handcart is in the "test" and "off" positions, the closing pulse model will not be output. After that, the controller will no longer output the closing pulse signal until the next bus voltage loss is detected, and the timing will be restarted. At the same time, the LCD can display the set closing delay time, closing delay timing, circuit breaker status, handcart position, and closing output status to realize man-machine dialogue. In order to ensure the safety of power consumption, the closing signal circuit The input/exit switch must be connected, and the switch needs to be set to the exit state when the line is under maintenance.

Claims (1)

1. a low voltage switch decompression reclosure control power transmission detection method, is characterized in that: the state being in point position by detecting reclosing control device power supply and busbar voltage input signal decompression and controlled low tension switch carries out reclosing control;

Concrete steps are:

Step 1: by low tension switch decompression reclosing control device place in circuit, detects reclosing controller power supply;

Step 2: controller directly from low-voltage bus bar power taking source signal, bus restore electricity or inlet wire break down successful reclosing time, detect busbar voltage;

Step 3: detect busbar voltage normal after start timing, after arriving setting-up time, detect circuit breaker and be in open position, handcart is in " work " position, controller output closing pulse signal;

Described low voltage switch decompression reclosure control power transmission device, comprise casing (1), casing (1) inside arranges single-chip microcomputer, single-chip microcomputer connection bus voltage input signal module, control keyboard input module, DI module, display module and relay output module, described control keyboard input module is connected with the button (3) being arranged on casing front, display module connects the LCD display (2) in casing front, button (3) is arranged on below LCD display (2), the casing back side is provided with binding post (4), binding post (4) and busbar voltage input signal module, DI module is corresponding with relay output module,

Described binding post U1, U2 with U3 is respectively by being connected A phase voltage L1 line after fuse, B phase voltage L2 line and C phase voltage L3 line, binding post UN connects N line, binding post N connects N line, binding post L is by connecting C phase voltage L3 after fuse, binding post PE ground connection, binding post DI1 connecting breaker (6) accesses DI common port COM port afterwards, binding post DI2 connects handcart position (7) and accesses DI common port COM port afterwards, relay output end binding post DOI-1 connects N line after dropping into/exit switch access closing coil (5), relay output end binding post DOI-2 is by accessing C phase voltage L3 line after resistance,

Described single-chip microcomputer adopts C8051F340; Described casing (1) is provided with louvre above and below casing (1); Described button (3) has F1, F2, F3 and F4 tetra-buttons.