CN205027885U - Three phase current monitoring system - Google Patents

Three phase current monitoring system Download PDF

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Publication number
CN205027885U
CN205027885U CN201520666106.5U CN201520666106U CN205027885U CN 205027885 U CN205027885 U CN 205027885U CN 201520666106 U CN201520666106 U CN 201520666106U CN 205027885 U CN205027885 U CN 205027885U
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China
Prior art keywords
module
phase
voltage
power supply
current
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Expired - Fee Related
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CN201520666106.5U
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Chinese (zh)
Inventor
易建军
罗金龙
毛远忠
罗伟
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Hunan Puan Construction Engineering Co Ltd
East China University of Science and Technology
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Hunan Puan Construction Engineering Co Ltd
East China University of Science and Technology
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    • Y02B60/50

Abstract

The utility model relates to a power monitoring and wireless communication technology field disclose a three phase current monitoring system, including voltage signal module, voltage transformer, a AD736 module, electric current signal modules, current transformer, LM741 module, the 2nd AD736 module, MCU module and power supply abnormal processing module etc. The utility model discloses the realization detects three phase current's voltage, judges whether under -voltage, excessive pressure, electric current to three phase current detects, whether judges the undercurrent, overflows, phase sequence to three phase current detects, judges whether lack looks, wrong looks, realize reminding the staff to handle power supply abnormal, save and remote monitoring the state parameter who is detected three phase current simultaneously.

Description

Three-phase supply monitoring system
Technical field
The utility model relates to power supply monitoring and wireless communication technology field, particularly a kind of three-phase supply monitoring system.
Background technology
Along with the development of science and technology, popularizing of electric equipment, the life of the people obtains and significantly improves, but people are to the increase of these electric equipment demands, also just causes electric system and becomes increasingly complex.At present, the power supply mode of electric system adopts three-phase system mostly, if there is a certain broken string mutually or misphase connection, just the irregular operating state of phase shortage or misphase can be produced, in addition, because the impact load work of some high-power electric appliances etc. causes interference to electrical network, produce the phenomenon such as overvoltage, under-voltage, overcurrent, undercurrent, all can have an impact to power supply.If consumer is in for a long time and in this case works, gently then damage consumer, heavy then initiation fire, crisis personal safety.Therefore under-voltage, the overvoltage, undercurrent, overcurrent, phase shortage, misphase etc. of power supply are monitored and there is very important realistic meaning.
Utility model content
In order to solve the problem, the utility model proposes a kind of three-phase supply monitoring system, can realize monitoring the electric current and voltage of three-phase supply and phase sequence, and remote switch control and process are carried out to three-phase supply.
The technical scheme that the utility model is taked is:
A kind of three-phase supply monitoring system, it is characterized in that, comprise voltage signal module, voltage transformer (VT), one AD736 module, current signal module, current transformer, LM741 module, 2nd AD736 module, MCU module and abnormity of power supply processing module, described voltage signal module, voltage transformer (VT), one AD736 module is connected to described MCU module successively, described current signal module, current transformer, LM741 module, 2nd AD736 module is connected to described MCU module successively, three-phase supply described in described voltage signal model calling provides three-phase voltage to described voltage transformer (VT), described voltage transformer (VT) converts the high voltage collected to low-voltage, the low voltage transition received is become DC voltage effective value by a described AD736 module, and be sent to described MCU module, three-phase supply described in described current signal model calling provides three-phase current to described current transformer, described current transformer converts the high current signal collected to low current signal, described LM741 module converts the low current signal received to low voltage signal and becomes DC voltage effective value further by the 2nd AD736 module converts, and be sent to described MCU module, described MCU module converts the DC voltage effective value that a described AD736 module and the 2nd AD736 module send actual voltage value and the current value of three-phase supply to, and by actual voltage value, current value and the overvoltage threshold preset, brownout threshold, overcurrent threshold value, undercurrent threshold value compares, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, and judged result is sent to described abnormity of power supply processing module and processes.
Further, described three-phase supply monitoring system also comprises Phase Sequence Monitor module, described Phase Sequence Monitor module is all connected to described MCU module, described Phase Sequence Monitor module carries out pile defection to described three-phase supply and positive negative phase sequence detects, and detection signal is sent to described MCU module, detection signal judged result is sent to described abnormity of power supply processing module and processes by described MCU module.
Further, described three-phase supply monitoring system also comprises phase sequence correction module, described phase sequence correction model calling is to described MCU module, when the judged result that described abnormity of power supply processing module obtains is misphase, described abnormity of power supply processing module carries out phase correction by described phase sequence correction module to described three-phase supply.
Further, described three-phase supply monitoring system also comprises alarm, display screen, described alarm and display screen are all connected to described MCU module, when described MCU module obtains described three-phase supply exception, described MCU module controls described alarm equipment alarm, controls described display screen display power supply abnormal information.
Further, described three-phase supply monitoring system also comprises remote monitoring center, WIFI module, router-module and power switch control module, described power switch control module is connected with described MCU module, described WIFI module connects described MCU module and described router-module, described router-module connects described remote monitoring center, described WIFI module receives the power supply status parameter that described MCU module sends, and send it to router-module, the power supply status parameter that described router-module receives WIFI module transmission sends it to remote monitoring center again, described remote monitoring center carries out storage monitoring to power supply status parameter, and send order by described router-module and WIFI module to MCU module, the switch of three-phase supply is controlled by described power switch control module.
Further, described three-phase supply monitoring system also comprises standby power supply, and described MCU module judges that described three-phase supply is as time abnormal, and described standby power supply is enabled.
The beneficial effects of the utility model are:
(1) three-phase supply state parameter is gathered with wireless data communication system integrated, by wireless data transmission network three-phase supply state parameter transmitted and store monitoring;
(2) adopt singlechip technology to gather data, process, occur that abnormal conditions control alarm equipment alarm, there is the advantages such as high-performance, high speed, low-power consumption, low cost;
(3) classification process is carried out to three-phase supply abnormal conditions;
(4) switch of Long-distance Control three-phase supply.
Accompanying drawing explanation
Accompanying drawing 1 three-phase supply monitoring and measuring application schematic diagram;
Accompanying drawing 2 is Phase Sequence Monitor process flow diagram;
Accompanying drawing 3 voltage acquisition process flow diagram;
Accompanying drawing 4 is voltage, current monitoring process flow diagram;
Accompanying drawing 5 is abnormity of power supply situation processing flow chart.
Embodiment
Elaborate below in conjunction with the embodiment of accompanying drawing to the utility model three-phase supply monitoring system.
See accompanying drawing 1, three-phase supply monitoring system comprises voltage signal module, voltage transformer (VT), an AD736 module, Phase Sequence Monitor module, MCU module, current signal module, current transformer, LM741 module, the 2nd AD736 module, alarm, power switch control module, abnormity of power supply processing module, WIFI module, router-module, remote monitoring center.Voltage signal module and current signal module provide voltage signal and current signal respectively.Voltage transformer (VT) mainly completes the collection of voltage signal, converts high voltage to low-voltage by a certain percentage, is convenient to measure, and guarantees the safety of operating personnel and instrument.AD736 module mainly converts alternating voltage to its effective value with voltage conversion chip AD736.Phase Sequence Monitor module carries out pile defection and forward and inverse Phase sequence detection to the three-phase voltage signal of input, when there is this state, sends state directive command to MCU module.Current transformer mainly plays the effect of current transformation and electrical equipment isolation, and electric current larger for numerical value is converted to the less electric current of numerical value in certain conversion ratio, is convenient to measure.LM741 module utilizes LM741 operational amplifier to convert the current signal of input to voltage signal.Alarm has warning function, reminds staff to come to process when abnormity of power supply.Power switch control module can realize carrying out remote switch control to power supply, when needs keep in repair equipment, when there is the situations such as thunderstorm weather, can send order control it at remote monitoring center to MCU module.Abnormity of power supply processing module, can carry out classification process to the various exceptions of three-phase supply, protection consumer and normal work.MCU module is used for carrying out AD conversion to the magnitude of voltage of input, and then the process that converts obtains actual voltage value and the current value of three-phase alternating-current supply, the overvoltage threshold of actual voltage value, current value and setting, brownout threshold, overcurrent threshold value, undercurrent threshold value are compared, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, simultaneously and the open phases of three-phase power source of Phase Sequence Monitor module detection and forward and inverse phase sequence state be presented on TFTLCD display screen; Controlling alarm, sending alarm command when monitoring abnormity of power supply to alarm; To the order of power switch control module transmit button, realize the switch Long-distance Control to power supply; Control abnormity of power supply processing module, classification process is carried out to the abnormal conditions of power supply; The power supply status parameter collected (comprise magnitude of voltage, current value and whether occur under-voltage, overvoltage, undercurrent, overcurrent, misphase, phase shortage) is sent to WIFI module.WIFI module receives the power supply status parameter that MCU module sends, and the power switch control command that the while of sending it to router, receiving router returns.The power supply status parameter that router-module receives WIFI module transmission sends it to remote monitoring center again, the power switch control command that remote monitoring center sends is sent to WIFI module simultaneously.Remote monitoring center carries out storage monitoring to power supply status parameter, and sends order to MCU module, the switch of remote control power.
Specifically, first three-phase mains voltage signal is inputted by voltage signal module to voltage transformer (VT), voltage transformer (VT) converts this high voltage signal to low voltage signal by a certain percentage, and be transported to an AD736 module and Phase Sequence Monitor module, voltage signal is converted to its effective value and is transported to MCU module by the one AD736 module, the voltage signal of Phase Sequence Monitor module to input detects simultaneously, see whether there is phase shortage and misphase phenomenon, and carry corresponding aberrant commands to indicate to MCU module, if there is misphase, phase shortage, MCU module to say the word warning to alarm, and control abnormity of power supply processing module and carry out abnormality processing.In addition, current signal module is to current transformer conveying three-phase supply current signal, current transformer converts this high current signal to low current signal by a certain percentage, and be transported to LM741 module, LM741 module converts the current signal of input to voltage signal, and be transported to the 2nd AD736 module, voltage signal is converted to its effective value and is transported to MCU module by the 2nd AD736 module, the voltage signal of MCU module to input carries out AD conversion, process is converted into actual voltage value, current value.And virtual voltage, current value and the overvoltage threshold set in advance, brownout threshold, overcurrent threshold value, undercurrent threshold value are compared, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, if there is this phenomenon, send order to alarm and report to the police, control abnormity of power supply processing module simultaneously and carry out abnormality processing.Simultaneously MCU module shows screen display three-phase supply state parameter (comprise actual voltage value, current value and whether there is under-voltage, overvoltage, undercurrent, overcurrent, phase shortage, misphase) at its TFTLCD.Three-phase supply state parameter is sent to WIFI module by MCU module, router is sent to by WIFI module, be sent to remote monitoring center by router again and carry out storage monitoring, remote monitoring center can send order to MCU module and control power switch control module simultaneously, controls the switch of power supply.
The method of above-mentioned three-phase power supply system is as follows:
First, the voltage signal of three-phase supply is provided by voltage signal module, and be transported to voltage transformer (VT), voltage transformer (VT) converts this high voltage signal to low voltage signal according to a certain percentage, be transported to an AD736 module and Phase Sequence Monitor module again, one AD736 module converts alternating voltage to its effective value with its voltage conversion chip AD736 and flows to MCU module, the three-phase voltage signal of Phase Sequence Monitor module to input carries out pile defection and Phase sequence detection, and testing result low and high level mode is sent to MCU module.
Current signal module provides the current signal of three-phase supply, flow to current transformer, current transformer converts this high current signal to low current signal according to a certain percentage, and be transported to LM741 module, LM741 module converts the current signal of input to voltage signal, be transported to the 2nd AD736 module again, the 2nd AD736 module converts alternating voltage to its effective value with its voltage conversion chip AD736 and flows to MCU module.
MCU module carries out AD conversion to the magnitude of voltage obtained by voltage signal module and current signal module, and then the process that converts obtains actual voltage value and the current value of three-phase alternating-current supply, the overvoltage threshold of actual voltage value, current value and setting, brownout threshold, overcurrent threshold value, undercurrent threshold value are compared, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, simultaneously and the open phases of three-phase power source of Phase Sequence Monitor module detection and forward and inverse phase sequence state be presented on TFTLCD display screen; The state parameter of three-phase supply is sent to WIFI module; Control alarm, when under-voltage, overvoltage, undercurrent, overcurrent, misphase, phase shortage appear in three-phase supply, send alarm command to alarm, remind staff to occur abnormal conditions; Control abnormity of power supply processing module, classification process is carried out to the exception of three-phase supply; Control power switch control module, remote switch control is carried out to three-phase supply.
The three-phase supply state parameter that the MCU module received sends is sent to router by WIFI module, remote monitoring center is sent to again by router, storage monitoring is carried out to power supply status parameter, when the great thunderstorm weather of appearance or when needing maintenance of equipment etc., power switch control command can be sent by remote monitoring center to MCU module, control the switch of power supply.
See accompanying drawing 2, three-phase mains voltage signal A, B, C enter sinusoidal detection respectively, then sampled signal are carried out pile defection, if lack A phase just send scarce A order to MCU module, lack B phase and just send scarce B order to MCU module, lack C phase and just lack C order to MCU module transmission; If phase shortage does not just carry out judging phase order, if misphase just sends backward order to MCU module, otherwise just send positive sequence order.
See accompanying drawing 3, first high ac voltage signal is transported to voltage transformer (VT) and carries out step-down process, being transported to AD736 module converts is again DC voltage effective value, AC current high signal is transported to current transformer to carry out falling stream process simultaneously, convert this ac current signal to ac voltage signal with LM741, lower ac voltage signal to be transported to AD736 module converts be DC voltage effective value.
See accompanying drawing 4, first analog voltage signal collection is carried out, then AD conversion is carried out to it, value after conversion is converted into actual magnitude of voltage through MCU module process, current value is also delivered to server and is stored, simultaneously magnitude of voltage, current value is transported to TFTLCD and shows screen display, in addition by actual voltage value, current value and the overvoltage threshold set in advance, brownout threshold, overcurrent threshold value, undercurrent threshold value compares, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, obtain three-phase supply state, if there is exception, then carry out abnormality processing, report to the police simultaneously.Not there is exception, then continue to compare with setting value, obtain electric current and voltage state.
See accompanying drawing 5, if there is exception, if misphase is abnormal, then by phase sequence correction module, three-phase power supply phase sequence is corrected, then recover normal phase sequence and power, if phase shortage is abnormal, is then switched to standby power supply and consumer is powered, if there is overcurrent, undercurrent, overvoltage, under-voltage, then cut off the electricity supply, then judge whether to recover normal value, if recovery normal value, then recover Power supply, if do not recover normal value, then judge that whether abnormal time is super after one minute (time can freely be arranged), if do not have, continue to judge whether to recover normal value, if abnormal time is super after one minute, then be switched to standby power supply to power to consumer, simultaneously also to voltage, current value judges, see and whether recover normal value, if not, then continuation standby power supply is powered, if recovery normal value, then switch back former three-phase supply to power to consumer.
Below be only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (6)

1. a three-phase supply monitoring system, it is characterized in that: comprise voltage signal module, voltage transformer (VT), one AD736 module, current signal module, current transformer, LM741 module, 2nd AD736 module, MCU module and abnormity of power supply processing module, described voltage signal module, voltage transformer (VT), one AD736 module is connected to described MCU module successively, described current signal module, current transformer, LM741 module, 2nd AD736 module is connected to described MCU module successively, three-phase supply described in described voltage signal model calling provides three-phase voltage to described voltage transformer (VT), described voltage transformer (VT) converts the high voltage collected to low-voltage, the low voltage transition received is become DC voltage effective value by a described AD736 module, and be sent to described MCU module, three-phase supply described in described current signal model calling provides three-phase current to described current transformer, described current transformer converts the high current signal collected to low current signal, described LM741 module converts the low current signal received to low voltage signal and becomes DC voltage effective value further by the 2nd AD736 module converts, and be sent to described MCU module, described MCU module converts the DC voltage effective value that a described AD736 module and the 2nd AD736 module send actual voltage value and the current value of three-phase supply to, and by actual voltage value, current value and the overvoltage threshold preset, brownout threshold, overcurrent threshold value, undercurrent threshold value compares, judge whether to exist under-voltage, overvoltage, undercurrent, over-current phenomenon avoidance, and judged result is sent to described abnormity of power supply processing module and processes.
2. three-phase supply monitoring system according to claim 1, it is characterized in that: described three-phase supply monitoring system also comprises Phase Sequence Monitor module, described Phase Sequence Monitor module is all connected to described MCU module, described Phase Sequence Monitor module carries out pile defection to described three-phase supply and positive negative phase sequence detects, and detection signal is sent to described MCU module, detection signal judged result is sent to described abnormity of power supply processing module and processes by described MCU module.
3. three-phase supply monitoring system according to claim 2, it is characterized in that: described three-phase supply monitoring system also comprises phase sequence correction module, described phase sequence correction model calling is to described MCU module, when the judged result that described abnormity of power supply processing module obtains is misphase, described abnormity of power supply processing module carries out phase correction by described phase sequence correction module to described three-phase supply.
4. three-phase supply monitoring system according to any one of claim 1 to 3, it is characterized in that: described three-phase supply monitoring system also comprises alarm, display screen, described alarm and display screen are all connected to described MCU module, when described MCU module obtains described three-phase supply exception, described MCU module controls described alarm equipment alarm, controls described display screen display power supply abnormal information.
5. three-phase supply monitoring system according to any one of claim 1 to 3, it is characterized in that: described three-phase supply monitoring system also comprises remote monitoring center, WIFI module, router-module and power switch control module, described power switch control module is connected with described MCU module, described WIFI module connects described MCU module and described router-module, described router-module connects described remote monitoring center, described WIFI module receives the power supply status parameter that described MCU module sends, and send it to router-module, the power supply status parameter that described router-module receives WIFI module transmission sends it to remote monitoring center again, described remote monitoring center carries out storage monitoring to power supply status parameter, and send order by described router-module and WIFI module to MCU module, the switch of three-phase supply is controlled by described power switch control module.
6. three-phase supply monitoring system according to any one of claim 1 to 3, is characterized in that: described three-phase supply monitoring system also comprises standby power supply, and described MCU module judges that described three-phase supply is as time abnormal, and described standby power supply is enabled.
CN201520666106.5U 2015-08-31 2015-08-31 Three phase current monitoring system Expired - Fee Related CN205027885U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137365A (en) * 2015-08-31 2015-12-09 湖南省普安建设工程有限公司 Three-phase power monitoring system and method
CN108363334A (en) * 2018-03-27 2018-08-03 江苏神剑机电科技有限公司 A kind of power-up control system
CN113671310A (en) * 2021-07-14 2021-11-19 广西电网有限责任公司桂林供电局 Alternating current system branch fault monitoring system and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137365A (en) * 2015-08-31 2015-12-09 湖南省普安建设工程有限公司 Three-phase power monitoring system and method
CN108363334A (en) * 2018-03-27 2018-08-03 江苏神剑机电科技有限公司 A kind of power-up control system
CN113671310A (en) * 2021-07-14 2021-11-19 广西电网有限责任公司桂林供电局 Alternating current system branch fault monitoring system and method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160210

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CF01 Termination of patent right due to non-payment of annual fee