CN201926727U - Power quality monitor - Google Patents

Power quality monitor Download PDF

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Publication number
CN201926727U
CN201926727U CN2011200075828U CN201120007582U CN201926727U CN 201926727 U CN201926727 U CN 201926727U CN 2011200075828 U CN2011200075828 U CN 2011200075828U CN 201120007582 U CN201120007582 U CN 201120007582U CN 201926727 U CN201926727 U CN 201926727U
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CN
China
Prior art keywords
unit
processor
quality monitor
voltage
processor unit
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Expired - Fee Related
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CN2011200075828U
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Chinese (zh)
Inventor
许新
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YANTAI YIKE ELECTRIC TECHNOLOGY Co Ltd
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YANTAI YIKE ELECTRIC TECHNOLOGY Co Ltd
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Priority to CN2011200075828U priority Critical patent/CN201926727U/en
Application granted granted Critical
Publication of CN201926727U publication Critical patent/CN201926727U/en
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Abstract

The utility model provides a power quality monitor, which comprises a power supply unit, an analog signal conditioning unit, a synchronous sampling analog-to-digital (A/D) conversion unit, a processor unit, a network communication unit and a control output unit, wherein the analog signal conditioning unit, the synchronous sampling A/D conversion unit and the processor unit are sequentially connected with the network communication unit, and the processor unit is additionally connected with the control output unit. The analog signal conditioning unit acquires the voltage signals of an alternating-current voltage transformer and the current signals of a current transformer, and the signals are transmitted to the processor unit through the synchronous sampling A/D conversion unit. The processor unit uses a 32-bit embedded processor chip and respectively transmits processed information to the network communication unit and the control output unit. The power quality monitor has the advantages and the beneficial effects that the capacity of the processor unit is large, the processor unit can control the time sequence of A/D sampling and the data access of sampling points, the real-time performance and the accuracy of the data are fully guaranteed, and the power quality monitor with a strong data analysis capacity is provided for the market.

Description

Electric energy quality monitor
Technical field
The utility model relates to measuring instrument, particularly a kind of electric energy quality monitor.
Background technology
Widespread use and development along with Power Electronic Technique, increased a large amount of nonlinear loads in the electric power system, as static transformator, industrial ac-dc conversion device from low pressure low capacity household electrical appliance to high-voltage large-capacity all has application, because static converter is with on-off mode work, can cause line voltage, current waveform distorts, cause the harmonic pollution of electrical network, impact, undulatory property load as: electric arc furnaces, heavy (merchant) mill, electric locomotives etc. are in service not only can to produce a large amount of higher hamonic waves, and make voltage fluctuation, flickering, tri-phase unbalance factor is on the rise, these adverse effects to electrical network not only can cause the security of electricity supply and use equipment itself to reduce, and can seriously undermine and disturb the economical operation of electrical network, cause public hazards to electrical network, on the other hand, bank, precise electronic device manufacturing industry, electric locomotive, computer network and service supervisory system etc. are the places that the quality of power supply is had relatively high expectations, and high-accuracy technology and equipment increases day by day to the demand of high-quality electric energy.
The real-time dynamic monitoring of the electrical network quality of power supply is the prerequisite and the basis of power quality harnessed synthetically.At present, the electric energy quality monitoring real-time is not strong, and monitoring means falls behind, cause data age poor, the quality of power supply level of each electric pressure of each department can't in time be understood by higher level department, lacks the foundation that decision-making is judged, thereby can't in time take corresponding measure to improve the quality of power supply.
Determine the origin cause of formation that causes the quality of power supply low, workload is big, needs expensive manpower and materials go to collect data, also will carry out statistical study to the data of collecting on the other hand.Efficient is low, to addressing this problem, often needs long time from the problem of finding the quality of power supply.The data sharing scarce capacity, the interchange of lacking experience between the personnel has seriously restricted the raising of peopleware, has hindered the progress of electric energy quality monitoring.
At present, improve monitoring means, improve the real-time of electric energy quality monitor device, development has the electric energy quality monitor of strong data analysis capabilities, adapts to the active demand that improves the quality of power supply, is a new topic of developing.
The utility model content
The purpose of this utility model is to overcome above-mentioned defective, and a kind of real-time that can improve electric energy quality monitoring is provided, and has the electric energy quality monitor of strong data analysis capabilities.
For achieving the above object, the electric energy quality monitor that the utility model provides, comprise power supply unit, also comprise the analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit, network communication unit and control output unit, wherein, described analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit links to each other successively with described network communication unit, described processor unit also links to each other with described control output unit, the current signal of the voltage signal summation current transformer of AC voltage transformer is gathered in described analog signal conditioner unit, and is transported to described processor unit through described synchronized sampling A/D converting unit; Described processor unit adopts 32 flush bonding processor chips, and the information that will handle is sent to described network communication unit and control output unit respectively.
The utility model electric energy quality monitor is connected with programmable logic controller (PLC) between wherein said synchronized sampling A/D converting unit and the described processor unit.
The utility model electric energy quality monitor, wherein said control output unit is output as the controlled contact of relay.
The utility model electric energy quality monitor, wherein said network communication unit is respectively arranged with RJ45 network interface and RS-232/RS-485 communication interface, described processor unit links to each other with the RS-232/RS-485 communication interface by the optocoupler unit, the output of described network communication unit comprises electric current and voltage effective value, power factor, the positive sequence of electric current and voltage, negative phase-sequence, zero-sequence component, the degree of unbalancedness of electric current and voltage, meritorious, idle, applied power, meritorious, idle electric degree, the harmonic content of electric current and voltage.
The utility model electric energy quality monitor, wherein said processor unit is provided with program storage and data-carrier store.
The advantage and the good effect of the utility model electric energy quality monitor are: because processor unit adopts 32 flush bonding processor chips and ultra-large programmable logic controller (PLC), have characteristics such as high capacity, programming in logic be powerful, in the sequential and data access of control A/D sampling to each sampled point, adopt digital filtering algorithm, guaranteed the real-time and the degree of accuracy of data.For market provides a kind of electric energy quality monitor with strong data analysis capabilities.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment.
Description of drawings
Fig. 1 is the structural representation of the utility model electric energy quality monitor.
Embodiment
With reference to Fig. 1, the utility model electric energy quality monitor comprises power supply unit, analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit, network communication unit and control output unit.Wherein, analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit link to each other successively with the network communication unit, and processor unit also links to each other with the control output unit.Be connected with programmable logic controller (PLC) between synchronized sampling A/D converting unit and the processor unit.
The current signal of the voltage signal summation current transformer of AC voltage transformer is gathered in the analog signal conditioner unit, and is transported to processor unit through synchronized sampling A/D converting unit.The analog signal conditioner cell processing is the analog input amount of 6 standards nearly, 128 times (scalable) of phase sampling weekly to 256 points, and analog input is configurable.
Processor unit adopts 32 flush bonding processor chips, and the information that will handle is sent to network communication unit and control output unit respectively.Processor unit interplantation embedded real-time operating system can directly download by hyper terminal, and upgrade maintenance is convenient, and portable good, system is reliable, has guaranteed the stability of whole terminal.Select ultra-large programmable logic controller (PLC) for use, have characteristics such as high capacity, programming in logic be powerful, in the sequential and data access of control A/D sampling, adopt digital filtering algorithm, guaranteed the real-time and the degree of accuracy of data each sampled point.
Processor unit is provided with plate and carries the temperature acquisition device, can the monitoring module temperature, and precision is 0.5 degree, measurement range is-40 ℃~+ 85 ℃.
Processor unit is provided with vast capacity program storage and data-carrier store, RJ45 network interface and RS-232/RS-485 communication interface, and processor unit links to each other with the RS-232/RS-485 communication interface by the optocoupler unit.The output of network communication unit comprises electric current and voltage effective value (precision is 0.2%), power factor, the positive sequence of electric current and voltage, negative phase-sequence, zero-sequence component, the degree of unbalancedness of electric current and voltage, meritorious, idle, applied power (precision is 0.5%), meritorious, idle electric degree, the harmonic content of electric current and voltage (2~50 times) output, metering refresh rate as a result is 20ms.The control output unit is output as the controlled contact of relay.
The utility model electric energy quality monitor is used to help the user to locate, predict, prevent and diagnose the fault of electric system, but the negative phase-sequence of on-line real time monitoring electrical network and harmonic wave, harmonic wave resultant distortion rate, electric current and voltage degree of unbalancedness, flickering, voltage deviation, change in voltage frequency, frequency departure, frequency change frequency, active power, reactive power, reactive energy or the like power quality index.The system-computed harmonic power, thus the influence of negative phase-sequence and harmonic wave can be analyzed to electric energy metrical.
Realizing that electrical network is to quality of power supply five indices (electric voltage frequency harmonic wave three-phase imbalance, voltage fluctuation and flickering) the all-weather networked control after, the requirement of systematic analysis and effectively control is achieved, promote the Automation of Electric Systems management level comprehensively, strengthen the supervision and management of the utility network quality of power supply, guaranteed electric power netting safe running.The system monitoring data are the incipient fault source of positioning system promptly and accurately, pollution source, analyze the characteristic in source, the type and the regularity of distribution, provide the generation of rectification scheme prevention electric power accident, can from the visual angle of quality of power supply checking power network structure whether rationally, whether device parameter equipment reasonable, the reason from the Perspective Analysis electric power accident of the quality of power supply takes place finally improves the safe reliability of operation of power networks.
The utility model electric energy quality monitor is a high-performance, economical power quality analysis, monitoring terminal, and it both can concentrate monitoring also can carry out the distributing monitoring to the quality of power supply in the electric system.The quality of power supply for low pressure (is that 1KV is with interior voltage according to the EN50160 standard) and middle pressure (is that 35KV is with interior voltage according to the EN50160 standard) is even more important, this is because modern industry and household electric appliances are used electronic installation in a large number, they can cause the quality of power supply and have a strong impact on, thereby cause the decline of the quality of power supply.
The environment that the utility model electric energy quality monitor can be used for relative closure for example building, a building, a transformer station, a production line etc. is implemented monitoring to its quality of power supply.Can be connected to display unit, personal computer or communication control unit to electric energy quality monitor, record also calculates desired measured value, for example current/voltage effective value, harmonic wave resultant distortion, each harmonic size, flickering and electric energy, and can be sent to main website on request.
Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and scope are limited; do not breaking away under the utility model design proposal prerequisite; common engineering technical personnel make the technical solution of the utility model in this area various modification and improvement; all should fall into protection domain of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.

Claims (5)

1. electric energy quality monitor, comprise power supply unit, it is characterized in that: also comprise the analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit, network communication unit and control output unit, wherein, described analog signal conditioner unit, synchronized sampling A/D converting unit, processor unit links to each other successively with described network communication unit, described processor unit also links to each other with described control output unit, the current signal of the voltage signal summation current transformer of AC voltage transformer is gathered in described analog signal conditioner unit, and is transported to described processor unit through described synchronized sampling A/D converting unit; Described processor unit adopts 32 flush bonding processor chips, and the information that will handle is sent to described network communication unit and control output unit respectively.
2. electric energy quality monitor according to claim 1 is characterized in that: be connected with programmable logic controller (PLC) between wherein said synchronized sampling A/D converting unit and the described processor unit.
3. electric energy quality monitor according to claim 1 and 2 is characterized in that: wherein said control output unit is output as the controlled contact of relay.
4. electric energy quality monitor according to claim 3, it is characterized in that: wherein said network communication unit is respectively arranged with RJ45 network interface and RS-232/RS-485 communication interface, described processor unit links to each other with the RS-232/RS-485 communication interface by the optocoupler unit, the output of described network communication unit comprises electric current and voltage effective value, power factor, the positive sequence of electric current and voltage, negative phase-sequence, zero-sequence component, the degree of unbalancedness of electric current and voltage, meritorious, idle, applied power, meritorious, idle electric degree, the harmonic content of electric current and voltage.
5. electric energy quality monitor according to claim 4 is characterized in that: wherein said processor unit is provided with program storage and data-carrier store.
CN2011200075828U 2011-01-12 2011-01-12 Power quality monitor Expired - Fee Related CN201926727U (en)

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Application Number Priority Date Filing Date Title
CN2011200075828U CN201926727U (en) 2011-01-12 2011-01-12 Power quality monitor

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Application Number Priority Date Filing Date Title
CN2011200075828U CN201926727U (en) 2011-01-12 2011-01-12 Power quality monitor

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721887A (en) * 2012-06-30 2012-10-10 李钢 Three-phase electrical parameter gathering device and method for analyzing and processing three-phase electrical signals
CN102928716A (en) * 2012-11-06 2013-02-13 江苏正佰电气股份有限公司 Intelligent power quality monitoring system
CN102967778A (en) * 2012-11-09 2013-03-13 北京天源科创风电技术有限责任公司 Device and method for detecting power grid
CN103969552A (en) * 2014-05-22 2014-08-06 河海大学 Harmonic source positioning and analyzing method for distributed power generation system
CN105116269A (en) * 2015-10-16 2015-12-02 苏州华源电气有限公司 Power quality detection and optimization structure for high-low-voltage power distribution cabinet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721887A (en) * 2012-06-30 2012-10-10 李钢 Three-phase electrical parameter gathering device and method for analyzing and processing three-phase electrical signals
CN102928716A (en) * 2012-11-06 2013-02-13 江苏正佰电气股份有限公司 Intelligent power quality monitoring system
CN102967778A (en) * 2012-11-09 2013-03-13 北京天源科创风电技术有限责任公司 Device and method for detecting power grid
CN102967778B (en) * 2012-11-09 2016-05-11 北京天源科创风电技术有限责任公司 A kind of electrical network checkout gear and detection method thereof
CN103969552A (en) * 2014-05-22 2014-08-06 河海大学 Harmonic source positioning and analyzing method for distributed power generation system
CN103969552B (en) * 2014-05-22 2016-08-24 河海大学 The harmonic source location of a kind of distributed generation system analyzes method
CN105116269A (en) * 2015-10-16 2015-12-02 苏州华源电气有限公司 Power quality detection and optimization structure for high-low-voltage power distribution cabinet

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

Granted publication date: 20110810

Termination date: 20150112

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