CN111313376A - Rural power grids block terminal phase failure warning protection device - Google Patents
Rural power grids block terminal phase failure warning protection device Download PDFInfo
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- CN111313376A CN111313376A CN202010235895.2A CN202010235895A CN111313376A CN 111313376 A CN111313376 A CN 111313376A CN 202010235895 A CN202010235895 A CN 202010235895A CN 111313376 A CN111313376 A CN 111313376A
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- module
- phase
- electrically connected
- voltage sensor
- relay
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a rural power grid distribution box open-phase alarm protection device which comprises a shell and a circuit device, wherein the circuit device comprises an A, B, 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; A. when the input end of the B, C phase voltage sensor is used, the input end is correspondingly and electrically connected with the ABC phase output end of the power distribution box output main switch; A. the output ends of the B, C phase voltage sensors are respectively and electrically connected with the singlechip 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 relay is electrically connected with 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 working power supply. The invention can timely alarm in situ and remotely when the phase failure occurs and automatically cut off the output power supply in time, thereby avoiding the burning of the three-phase electric equipment of the user.
Description
Technical Field
The invention relates to a distribution box supporting facility, in particular to a rural power grid distribution box phase failure alarm protection device.
Background
With the development of economy and society, three-phase electric equipment powered by rural power grids is increasing, and production machinery driven by a three-phase motor, a three-phase water pump and the like are widely applied. The terminal equipment that supplies power for three-phase consumer of rural power grids generally is the block terminal, and current rural power grids block terminal is equipped with power consumption metering device through master switch to user output three-phase alternating current in the block terminal, and partial intelligent power consumption metering device can reduce to output voltage to the block terminal and play certain monitoring effect, nevertheless does not possess automatic alarm and takes automatic safeguard measure's function, does not possess the power-off protection function yet. In production practice, when a rural power grid distribution box has a phase failure fault, the three-phase motor can still run at a low speed under a plurality of phase failure conditions, at the moment, the three-phase motor is easily burnt down due to large stator current, so that direct serious economic loss of equipment is brought to users, and meanwhile, the power supply operation and maintenance department cannot acquire fault information in the first time, so that the first-aid repair time is delayed, the field power failure time is prolonged, and the power consumption of the users in production and life is influenced. According to statistics of power supply departments, single-phase open circuit faults are the main type of open circuit faults of the distribution box and account for about 86% of all faults. Aiming at the current situation, it is necessary to develop a rural power grid distribution box capable of effectively overcoming the defects caused by the phase failure as soon as possible.
Disclosure of Invention
The purpose of the invention is: aiming at the problems in the prior art, the open-phase alarm protection device for the rural power grid distribution box can monitor the output voltage of the rural power grid distribution box in real time, can give an alarm locally and remotely in time when an open-phase fault occurs, and can automatically cut off an output power supply in time.
The technical scheme of the invention is as follows: the invention discloses an open-phase alarm protection device for a rural power grid distribution box, which is structurally 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.
The further scheme is as follows: 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.
The further scheme is as follows: the wireless communication module is an A6 wireless communication module based on a GSM network and provided with a SIM card.
The further scheme is as follows: the single-chip microcomputer module is formed based on a single-chip microcomputer of STC89C52 model, and a low-voltage alarm threshold value and a single-phase open-phase alarm threshold value are arranged in the single-chip microcomputer.
The further scheme is as follows: 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 connection point with one end of the resistor R4 and a base electrode of a triode Q1, the other end of an electrical cathode R4 is grounded with an emitter of a triode Q1, a collector of the triode Q1 is electrically connected with an anode of a diode D1 and one end of a relay coil, a No. 4 wiring pin of the optocoupler U1, an anode of the diode D1 and the other end of the relay coil are provided with a common connection point, and the common end point is electrically connected with a DC +12V power output end of the power supply; 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.
The invention has the positive effects that: (1) when the rural power grid distribution box phase failure alarm protection device is used, failure alarm information including a serial number can be sent to first-aid repair personnel at a power supply part when too low voltage and phase failure occur, and the first-aid repair personnel can carry out first-aid repair maintenance at the first time, so that the power failure time is greatly shortened. (2) When the rural power grid distribution box phase failure alarm protection device is used, when the rural power grid distribution box has a phase failure, the output main switch of the distribution box can be automatically controlled to rapidly trip, and therefore the burning loss of electric equipment such as a three-phase motor and the like due to phase failure operation can be fundamentally avoided. (3) According to the rural power grid distribution box phase failure alarm protection device, the circuit device is arranged in the plastic box body, the 3 voltage sensors are connected with the high-voltage wire through the insulating crocodile clip, live operation can be achieved, and the rural power grid distribution box phase failure alarm protection device is convenient to install and use. (4) The phase failure alarm protection device for the rural power grid distribution box has the advantages of relatively simple overall structure and low cost, and is suitable for popularization in the rural power grid power transmission and distribution network.
Drawings
FIG. 1 is a schematic block diagram of the circuit configuration of the present invention, further illustrating its electrical connection to the main output switch of the switchbox in use;
fig. 2 is an electrical schematic diagram of the optocoupler isolation module and the relay in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
(example 1)
Referring to fig. 1, the rural power grid distribution box phase failure alarm protection device of the embodiment mainly comprises a housing and a circuit device arranged in the housing. The shell adopts the box spare of plastics material, and circuit arrangement includes A looks voltage sensor, B looks voltage sensor, C looks voltage sensor, single chip module, LCD screen, audible-visual alarm module, wireless communication module, opto-coupler isolation module, relay and power 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 A phase voltage sensor, the B phase voltage sensor and the C phase voltage sensor adopt Hall voltage sensors, output voltages of A, B, C phase output ends of the distribution box output main switch are monitored in real time respectively during use, and monitoring signals are sent to the single chip microcomputer module to be processed. Preferably, the A phase voltage sensor, the B phase voltage sensor and the C phase voltage sensor are correspondingly and electrically connected with the A, B, C phase output end of the distribution box output main switch through the insulating alligator clips with wires respectively.
The singlechip module is formed based on a singlechip, and the model of the singlechip is preferably STC89C 52. The single-chip microcomputer module is internally provided with a low-voltage alarm threshold and a single-phase open-phase alarm threshold, in the embodiment, the low-voltage alarm threshold is preferably 205V, the single-phase open-phase alarm threshold is preferably 132V, and when the single-chip microcomputer module works, the single-chip microcomputer module receives voltage signals collected and sent by the A-phase voltage sensor, the B-phase voltage sensor and the C-phase voltage sensor in real time and compares the voltage signals with the internally arranged judgment threshold so as to perform corresponding control actions. It should be noted that the program built in the single chip microcomputer module is a simple prior art.
The liquid crystal screen preferably adopts an OLED liquid crystal screen, and the liquid crystal screen is used for displaying parameters including real-time monitoring voltage values and the like sent by the single chip microcomputer in real time so as to be convenient for workers to observe.
The sound-light alarm module mainly comprises a buzzer and an LED lamp, and is used for giving out sound and light flickering to give an alarm in place when the singlechip judges that the voltage is too low or the phase failure occurs.
The wireless communication module adopts the A6 wireless communication module based on GSM network who sets the SIM card, wireless communication module is used for when the singlechip judges that take place the voltage and hang down excessively or when the phase failure, send corresponding trouble information to backstage supporter's staff with SMS or APP data mode after receiving the information that singlechip module sent and attaching SIM card serial number, backstage supporter's staff can confirm the rural power grids block terminal position and the corresponding trouble that break down the very first time according to SIM card serial number, make pointed ground at the very first time notice first-aid repair personnel and carry out the maintenance.
The optical coupling isolation module is used for isolating the singlechip from the strong current connected with the relay. I.e. to isolate strong and weak currents. The relay is used for controlling the on-off of the output main switch of the distribution box, and the relay adopts a single-pole single-throw relay. As an embodiment of an optical coupling isolation module and a circuit connected with the optical coupling isolation module, referring to fig. 2, the optical coupling isolation module mainly comprises 4 resistors from R1 to R4, an optical coupler U1, a triode Q1 and a diode D1, the optical coupler U1 preferably adopts an optical coupling module of TLP521-1 type and has connection pins 1 to 4, the relay has a coil, a moving contact and a fixed contact, one end of the resistor R1 is electrically connected with the single chip microcomputer module, the other end of the resistor R1, one end of the resistor R2 and the connection pin 2 of the optical coupler U1 have a common connection point, the other end of the resistor R2 and the connection pin 1 of the optical coupler U1 have a common end point, and the common end point is connected with a DC +5V power supply output end of the power supply module; 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 connection point with one end of the resistor R4 and a base electrode of a triode Q1, the other end of an electrical cathode R4 is grounded with an emitter of a triode Q1, a collector of the triode Q1 is electrically connected with an anode of a diode D1 and one end of a relay coil, a No. 4 wiring pin of the optocoupler U1, an anode of the diode D1 and the other end of the relay coil are provided with a common connection point, and the common connection point is connected with a DC +12V power output end of the 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.
The power module is used for providing the working power supply of this device, and input termination commercial power when power module uses, and power module is used for converting the commercial power into two way power of DC +5V and DC +12V for this device power supply, and power module constitutes based on the power conversion module of LM2596 model, and its structure is ripe prior art, does not do the detailed description.
The following brief description of the working process of the rural power grid distribution box open-phase alarm protection device in the embodiment when in use is as follows:
when the rural power grid distribution box open-phase alarm protection device is used, an A phase voltage sensor, a B phase voltage sensor and a C phase voltage sensor respectively monitor A, B, C phase voltage output by an A, B, C phase output end of a distribution box output main switch in real time, monitoring signals are sent to a single chip microcomputer module to be processed, the single chip microcomputer module receives voltage signals collected and sent by a A, B, C phase voltage sensor in real time and compares the voltage signals with a built-in judgment threshold value, when the single chip microcomputer module judges that a voltage too low fault occurs, the single chip microcomputer sends real-time monitoring voltage values to a liquid crystal display to display, drives an acousto-optic alarm module to give an alarm in place, and sends fault information to background workers; when the singlechip module judges that the phase failure occurs, the singlechip module sends a real-time monitoring voltage value to be displayed on a liquid crystal display, drives the acousto-optic alarm module to give an alarm on the spot and sends failure information to a background worker, the singlechip module sends an action instruction to the relay through the optocoupler isolation module, the relay is electrified to act, and the control loop of the distribution box output main switch enables the output main switch to trip rapidly, so that the loss of burning out of the three-phase motor due to phase failure operation of a user can be fundamentally avoided.
The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope 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 connection point with one end of the resistor R4 and a base electrode of a triode Q1, the other end of an electrical cathode R4 is grounded with an emitter of a triode Q1, a collector of the triode Q1 is electrically connected with an anode of a diode D1 and one end of a relay coil, a No. 4 wiring pin of the optocoupler U1, an anode of the diode D1 and the other end of the relay coil are provided with a common connection point, and the common end point is electrically connected with a DC +12V power output end of the power supply; 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235895.2A CN111313376A (en) | 2020-03-30 | 2020-03-30 | Rural power grids block terminal phase failure warning protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235895.2A CN111313376A (en) | 2020-03-30 | 2020-03-30 | Rural power grids block terminal phase failure warning protection device |
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| Publication Number | Publication Date |
|---|---|
| CN111313376A true CN111313376A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010235895.2A Pending CN111313376A (en) | 2020-03-30 | 2020-03-30 | Rural power grids block terminal phase failure warning protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018723A (en) * | 2020-10-14 | 2020-12-01 | 四川航天职业技术学院(四川航天高级技工学校) | Phase-failure protector |
| CN112578314A (en) * | 2020-11-25 | 2021-03-30 | 广东电网有限责任公司 | Single-phase wire breakage detection system for power distribution network |
-
2020
- 2020-03-30 CN CN202010235895.2A patent/CN111313376A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018723A (en) * | 2020-10-14 | 2020-12-01 | 四川航天职业技术学院(四川航天高级技工学校) | Phase-failure protector |
| CN112018723B (en) * | 2020-10-14 | 2021-01-29 | 四川航天职业技术学院(四川航天高级技工学校) | Phase-failure protector |
| CN112578314A (en) * | 2020-11-25 | 2021-03-30 | 广东电网有限责任公司 | Single-phase wire breakage detection system for power distribution network |
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