CN211908353U - A phase failure alarm protection device for a rural power grid distribution box - Google Patents

Abstract

The utility model provides a phase failure alarm protection device for a rural power grid distribution box, which comprises a casing and a circuit device. The circuit device includes A, B and C phase voltage sensors, a single-chip module, a liquid crystal screen, an acousto-optic alarm module, a wireless communication module, Optocoupler isolation module, relay and power supply module; the input terminals of A, B, and C phase voltage sensors are respectively electrically connected to the ABC phase output terminals of the output main switch of the distribution box when used; the outputs of A, B, and C phase voltage sensors The terminals are respectively electrically connected with the single-chip module; the liquid crystal screen, the sound and light alarm module, the wireless communication module and the optocoupler isolation module are electrically connected with the single-chip module respectively; the relay is electrically connected with the optocoupler isolation module, and the output terminal of the relay is output from the distribution box when in use The control loop of the main switch is electrically connected; the power module is used to provide working power. The utility model can timely and remotely alarm on the spot and automatically cut off the power supply when a phase failure occurs, so as to prevent the user's three-phase electrical equipment from burning.

Description

A phase failure alarm protection device for a rural power grid distribution box

technical field

The utility model relates to a distribution box supporting facility, in particular to a phase failure alarm protection device for a rural power grid distribution box.

Background technique

With the development of economy and society, the number of three-phase electrical equipment powered by the rural grid is increasing, such as production machinery driven by three-phase motors, three-phase water pumps, etc., which have been widely used. The equipment that supplies power to the three-phase electrical equipment at the end of the rural grid is generally a distribution box. The existing rural grid distribution box outputs three-phase alternating current to the user through the main switch. The metering device can monitor whether the output voltage of the distribution box is reduced to a certain extent, but it does not have the function of automatic alarm and automatic protection measures, nor does it have the function of power-off protection. In production practice, when a phase failure occurs in the distribution box of the rural grid, the three-phase motor can still run at low speed in many cases of phase failure. At this time, due to the large stator current, it is easy to cause the three-phase motor to burn out, not only for the user. It will bring serious economic losses to the equipment. At the same time, because the power supply operation and maintenance department cannot get the fault information immediately, the repair time is delayed, the on-site power outage time is prolonged, and the user's production and living electricity consumption is affected. According to the statistics of the power supply department, among the faults of the distribution box, the single-phase open circuit fault is the main type of the open circuit fault of the distribution box, accounting for about 86% of all faults. In view of this situation, it is very necessary to develop a rural power grid distribution box that can effectively overcome the drawbacks caused by phase failure as soon as possible.

Utility model content

The purpose of the utility model is: aiming at the problems existing in the prior art, to provide a kind of real-time monitoring of the output voltage of the rural power grid distribution box, timely local and remote alarming and timely automatic cut-off when a phase failure occurs. A phase failure alarm protection device for the rural power distribution box of the output power supply.

The technical scheme of the utility model is: the utility model is a phase failure alarm protection device for a rural power grid distribution box, and its structural features are: including a casing and a circuit device arranged in the casing, and the circuit device includes a phase A voltage sensor, a phase B voltage sensor, and a circuit device. Voltage sensor, C-phase voltage sensor, microcontroller module, LCD screen, sound and light alarm module, wireless communication module, optocoupler isolation module, relay and power supply module;

The input terminals of the above-mentioned A-phase voltage sensor, B-phase voltage sensor and C-phase voltage sensor are respectively electrically connected to the A, B and C-phase output terminals of the output main switch of the distribution box when they are used; A-phase voltage sensor, B-phase voltage sensor The output end of the voltage sensor and the C-phase voltage sensor are respectively electrically connected to the single-chip module; the liquid crystal screen, the sound and light alarm module, the wireless communication module and the optocoupler isolation module are respectively electrically connected to the single-chip module; the input end of the relay is electrically connected to the output end of the optocoupler isolation module. Connection, the output end of the relay is electrically connected to the control circuit of the main output switch of the distribution box when in use; the power module is used to provide DC+5V and DC+12V working power.

A further solution is: it also includes insulating alligator clips, and the above-mentioned A-phase voltage sensor, B-phase voltage sensor and C-phase voltage sensor respectively output the A, B, and C-phase output terminals of the main switch through the insulated alligator clip with wires and the distribution box. Corresponding electrical connection.

A further solution is: the above-mentioned wireless communication module is an A6 wireless communication module based on a GSM network equipped with a SIM card.

A further solution is: the single-chip microcomputer module is formed based on the single-chip microcomputer of the STC89C52 type, and the single-chip microcomputer has a built-in low-voltage alarm threshold and a single-phase phase failure alarm threshold.

A further solution is: the above-mentioned relay is a single-pole single-throw relay, the relay has a coil, a moving contact and a static contact, and the above-mentioned optocoupler isolation module includes a total of 4 resistors R1 to R4, an optocoupler U1, a transistor Q1 and a diode D1, The above optocoupler U1 is an optocoupler module of the TLP521-1 model, which has pins 1 to 4. One end of the resistor R1 is electrically connected to the microcontroller module, the other end of the resistor R1 is connected to one end of the resistor R2 and the second end of the optocoupler U1. The wiring pin has a common contact, the other end of the resistor R2 has a common terminal with the No. 1 wiring pin of the optocoupler U1, and the common terminal is electrically connected with the DC+5V power output terminal of the power supply module; the No. 3 wiring pin of the optocoupler U1 is connected to the resistor. One end of R3 is electrically connected, the other end of the resistor R3 has a common contact with one end of the resistor R4 and the base of the transistor Q1, the other end of the resistor R4 is grounded with the emitter of the transistor Q1, the collector of the transistor Q1 and the anode of the diode D1 and One end of the relay coil is electrically connected, and the No. 4 terminal pin of the optocoupler U1, the negative electrode of the diode D1 and the other end of the relay coil are all electrically connected to the DC+12V power output terminal of the power module; the relay is used with the moving and static contacts. At the same time, it is electrically connected to the control circuit of the output main switch of the distribution box through the No. 1 and No. 2 terminals of the equipped connector J1.

The utility model has positive effects: (1) The utility model is a phase failure alarm protection device for a rural power grid distribution box. When it is in use, it can be sent to the emergency repair personnel of the power supply department when the voltage is too low and the phase failure occurs. The fault alarm information including the serial number enables emergency repair personnel to carry out emergency repair and maintenance at the first time, thereby greatly shortening the power outage time. (2) The phase failure alarm protection device of the rural power grid distribution box of the present utility model can automatically control the output main switch of the power distribution box to trip quickly when the rural power grid power distribution box is out of phase and a phase failure occurs when it is in use. From the source, it can prevent the user's three-phase motor and other electrical equipment from burning down due to lack of phase operation. (3) The phase failure alarm protection device of the rural power grid distribution box of the present utility model is installed in the plastic box body, and the three voltage sensors are connected with the high-voltage wires through the insulating crocodile clips, which can be operated with electricity, and is easy to install and use. (4) The phase failure alarm protection device of the rural power distribution box of the present utility model has a relatively simple overall structure and low cost, and is suitable for promotion in the rural power transmission and distribution network.

Description of drawings

Fig. 1 is a schematic block diagram of the circuit structure of the utility model, and the figure also shows the electrical connection relationship with the output main switch of the distribution box when in use;

FIG. 2 is an electrical schematic diagram of the optocoupler isolation module and the relay in FIG. 1 .

Detailed ways

The present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

(Example 1)

Referring to Fig. 1, the phase failure alarm protection device of the rural power grid distribution box in this embodiment is mainly composed of a casing and a circuit device arranged in the casing. The shell is made of plastic box body, and the circuit device includes A-phase voltage sensor, B-phase voltage sensor, C-phase voltage sensor, single chip module, LCD screen, sound and light alarm module, wireless communication module, optocoupler isolation module, relay and power supply module.

The input terminals of the A-phase voltage sensor, B-phase voltage sensor and C-phase voltage sensor are respectively electrically connected to the A, B and C-phase output terminals of the output main switch of the distribution box when they are used; A-phase voltage sensor, B-phase voltage sensor and The output terminals of the C-phase voltage sensor are respectively electrically connected with the single-chip microcomputer module; the liquid crystal screen, the sound and light alarm module, the wireless communication module and the optocoupler isolation module are respectively electrically connected with the single-chip module; the input terminal of the relay is electrically connected with the output terminal of the optocoupler isolation module , the output end of the relay is electrically connected with the control circuit of the output main switch of the distribution box when in use.

The A-phase voltage sensor, B-phase voltage sensor and C-phase voltage sensor use Hall voltage sensor. When in use, the output voltage of the A, B, and C-phase output terminals of the output main switch of the distribution box is monitored in real time, and the monitoring signal is sent. To the microcontroller module processing. Preferably, the A-phase voltage sensor, B-phase voltage sensor and C-phase voltage sensor are respectively electrically connected to the A, B, and C-phase output terminals of the output main switch of the distribution box through insulated alligator clips with wires. The advantage is that when connecting As long as the insulated alligator clips are clamped to the circuit under test, it is simple and convenient, and no power failure is required.

The single-chip microcomputer module is based on the single-chip microcomputer, and the single-chip microcomputer model is preferably STC89C52. The single-chip module has built-in low-voltage alarm thresholds and single-phase open-phase alarm thresholds. In this embodiment, the low-voltage alarm threshold is preferably 205V, and the single-phase open-phase alarm threshold is preferably 132V. During operation, the single-chip module receives the A-phase voltage sensor, B The phase voltage sensor and the C-phase voltage sensor collect and send the voltage signal and compare it with the built-in judgment threshold to make corresponding control actions. It should be noted that the built-in program of the single-chip microcomputer module is a simple prior art.

The liquid crystal screen is preferably an OLED liquid crystal screen, and the liquid crystal screen is used for real-time display of parameters including the real-time monitoring voltage value sent by the single-chip microcomputer, so as to facilitate the observation of the staff.

The sound and light alarm module is mainly composed of a buzzer and LED lights. The sound and light alarm module is used to issue a sound and light flashing local alarm when the single-chip microcomputer judges that the voltage is too low or a phase failure occurs.

The wireless communication module adopts the A6 wireless communication module based on the GSM network equipped with a SIM card. The wireless communication module is used to receive the information sent by the single-chip microcomputer module and append the SIM card number when the single-chip computer judges that the voltage is too low or the phase failure occurs. Send the corresponding fault information to the background staff by SMS or APP data, and the background staff can immediately determine the location of the faulty rural power distribution box and the corresponding fault according to the SIM card number, and notify them at the first time in a targeted manner. Emergency repair personnel carry out emergency repair and maintenance.

The optocoupler isolation module is used to isolate the single-chip microcomputer from the strong electricity connected to the relay. That is to say, it plays the role of isolating strong and weak electricity. The relay is used to control the on-off of the output main switch of the distribution box, and the relay adopts the single-pole single-throw relay. As a circuit implementation of the optocoupler isolation module and its connection with the relay, see Figure 2, the optocoupler isolation module is mainly composed of four resistors R1-R4, optocoupler U1, transistor Q1 and diode D1, optocoupler U1 is preferred The optocoupler module TLP521-1 is used, which has pins 1 to 4. The relay has coils, moving contacts and static contacts. One end of the resistor R1 is electrically connected to the microcontroller module, and the other end of the resistor R1 is connected to the resistor R2. One end of the resistor R2 and the No. 2 terminal of the optocoupler U1 have a common contact, the other end of the resistor R2 has a common terminal with the No. 1 terminal of the optocoupler U1, and the common terminal is connected to the DC+5V power output terminal of the power supply module; the optocoupler U1 The No. 3 pin is electrically connected to one end of the resistor R3, the other end of the resistor R3 has a common contact with one end of the resistor R4 and the base of the transistor Q1, the other end of the resistor R4 is grounded with the emitter of the transistor Q1, and the collector of the transistor Q1 The electrode is electrically connected to the positive pole of the diode D1 and one end of the relay coil. The No. 4 terminal pin of the optocoupler U1, the negative pole of the diode D1 and the other end of the relay coil are all electrically connected to the DC+12V power output terminal of the power module; When the contacts and static contacts are in use, they are electrically connected to the control circuit of the main output switch of the distribution box through the No. 1 and No. 2 terminals of the joint J1.

The power module is used to provide the working power of the device. When the power module is in use, the input terminal is connected to the mains. The power module is used to convert the mains into DC+5V and DC+12V two-way power supplies to supply power to the device. The power module is based on the LM2596 model. It is composed of a power conversion module, and its structure is a mature prior art, which will not be described in detail.

The following briefly describes the working process of the phase failure alarm protection device of the rural power grid distribution box of the present embodiment when it is in use:

When the phase failure alarm protection device of the rural power grid distribution box of this embodiment is in use, the A-phase voltage sensor, the B-phase voltage sensor and the C-phase voltage sensor output to the A, B, and C-phase output terminals of the output main switch of the distribution box, respectively. The A, B and C phase voltages are monitored in real time, and the monitoring signals are sent to the single-chip microcomputer module for processing. When the module judges that the voltage is too low fault, the single-chip microcomputer sends the real-time monitoring voltage value to the LCD screen to display, drives the sound and light alarm module to give an alarm on the spot, and sends the fault information to the background staff; Send the real-time monitoring voltage value to the LCD screen, drive the sound and light alarm module to give an alarm on the spot, and send the fault information to the background staff. The control circuit of the main output switch of the box makes the main output switch trip quickly, so as to prevent the user's three-phase motor from running out of phase and burn out from the source.

The above embodiment is an illustration of the specific embodiments of the present invention, rather than a limitation of the present invention. Those skilled in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the scope of patent protection of the present invention.

Claims (5)

1. The utility model provides a rural power grids block terminal looks open alarm protection device which characterized in that: the circuit device comprises an A-phase voltage sensor, a B-phase voltage sensor, a C-phase voltage sensor, a single chip microcomputer module, a liquid crystal screen, a sound-light alarm module, a wireless communication module, an optical coupling isolation module, a relay and a power supply module;

the input ends of the A phase voltage sensor, the B phase voltage sensor and the C phase voltage sensor are respectively and correspondingly electrically connected with the A, B, C phase output end of the distribution box output main switch when in use; the output ends of the A phase voltage sensor, the B phase voltage sensor and the C phase voltage sensor are respectively and electrically connected with the single chip microcomputer module; the liquid crystal screen, the sound-light alarm module, the wireless communication module and the optical coupling isolation module are respectively and electrically connected with the single chip microcomputer module; the input end of the relay is electrically connected with the output end of the optical coupling isolation module, and the output end of the relay is electrically connected with a control loop of a distribution box output main switch when in use; the power supply module is used for providing DC +5V and DC +12V working power supplies.

2. The rural power grids block terminal open-phase alarm protection device of claim 1, its characterized in that: the voltage sensor of the A-phase, the voltage sensor of the B-phase and the voltage sensor of the C-phase are respectively and correspondingly electrically connected with the A, B, C-phase output end of the output main switch of the distribution box through the insulating alligator clips with wires.

3. Rural power grids block terminal open-phase warning protection device according to claim 1 or 2, characterized in that: the wireless communication module is a6 wireless communication module based on GSM network and equipped with SIM card.

4. Rural power grids block terminal open-phase warning protection device according to claim 1 or 2, characterized in that: the single-chip microcomputer module is composed of a single-chip microcomputer of STC89C52 type, and a low-voltage alarm threshold value and a single-phase failure alarm threshold value are arranged in the single-chip microcomputer.

5. Rural power grids block terminal open-phase warning protection device according to claim 1 or 2, characterized in that: the relay is a single-pole single-throw relay, the relay is provided with a coil, a moving contact and a fixed contact, the optical coupling isolation module comprises 4 resistors R1-R4, an optical coupler U1, a triode Q1 and a diode D1, the optical coupler U1 is a TLP521-1 type optical coupling module and is provided with No. 1-4 wiring pins, one end of a resistor R1 is electrically connected with the single chip microcomputer module, the other end of the resistor R1 is connected with one end of the resistor R2 and the No. 2 wiring pin of the optical coupler U1 through a common connection point, the other end of the resistor R2 and the No. 1 wiring pin of the optical coupler U1 are provided with a common end point, and the common end point is electrically connected with a DC +5V power supply output; a No. 3 wiring pin of the optocoupler U1 is electrically connected with one end of a resistor R3, the other end of the resistor R3 is provided with a common contact with one end of the resistor R4 and a base electrode of a triode Q1, the other end of the resistor R4 is grounded with an emitting electrode of a triode Q1, a collector electrode of the triode Q1 is electrically connected with an anode of a diode D1 and one end of a relay coil, and a No. 4 wiring pin of the optocoupler U1, a cathode of the diode D1 and the other end of the relay coil are electrically connected with a DC +12V power output end of a power module; when the relay, the moving contact and the static contact are used, the relay, the moving contact and the static contact are electrically connected with a control loop of an output main switch of the distribution box through No. 1 and No. 2 terminals of a joint J1.

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