CN206096293U - Power detection measurement system - Google Patents
Power detection measurement system Download PDFInfo
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- CN206096293U CN206096293U CN201621005797.5U CN201621005797U CN206096293U CN 206096293 U CN206096293 U CN 206096293U CN 201621005797 U CN201621005797 U CN 201621005797U CN 206096293 U CN206096293 U CN 206096293U
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Abstract
The utility model discloses a power detection measurement system, including exchangeable module, preceding terminal voltage electric current collection module, electric energy quality analysis module, MCU treater, system power module, exchangeable module and preceding terminal voltage electric current collection module in proper order with electric energy quality analysis module communication connection, electric energy quality analysis module and MCU treater is communication connection each other, system power module is connected with electric energy quality analysis module, MCU treater electricity, including a plurality of exchangeable modules and preceding terminal voltage electric current collection module, exchangeable module and preceding terminal voltage electric current collection module one -to -one set up, have simplified measurement system, and the cost is reduced has lightened measurement personnel's intensity of labour.
Description
Technical field
The utility model is related to power monitoring field, more particularly to a kind of electric energy detection metering system.
Background technology
At present, the instrument that can carry out Power Quality Detection is a lot, but great majority are that the quality of power supply to certain point is carried out
Detection, it is impossible to detection is synchronized to multiple spot.Can carry out the instrument that multiple spot is detected simultaneously individually, one be it is expensive, the
Two is to need to carry out long range networking with transmission line, and installation work amount is big, be vulnerable to environment limits and cannot ensure that data are passed
Defeated reliability.And colliery carries out Power Quality Detection and needs while multiple points are carried out with the detection of electric energy, it is clear that at present
Some detecting systems cannot meet this requirement.
For such case, present applicant proposes need not carry out networking just can carry out the scheme of Multipoint synchronous detection.Should
Scheme can enormously simplify measuring system, reduce cost, alleviate the labour intensity of metrological personnel.Electric energy balance is tested
The routine work in power-saving technology service station, is the important means of power-saving technology service, therefore with very high economy and society's meaning
Justice.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of electric energy detection metering system, simplifies measurement system
System, reduce cost, alleviate the labour intensity of metrological personnel, to solve prior art in caused above-mentioned multinomial defect.
For achieving the above object, the utility model provides following technical scheme：A kind of electric energy detection metering system, including
Mutual inductance module, front voltage current acquisition module, power quality analysis module, MCU processors, system power supply module；
Mutual inductance module and front voltage current acquisition module are communicated to connect successively with power quality analysis module；
Power quality analysis module and MCU processors are communicated to connect each other；
System power supply module is electrically connected with power quality analysis module, MCU processors；
Including multiple mutual inductance modules and front voltage current acquisition module, mutual inductance module and front voltage current acquisition module
Correspond and arrange；
Mutual inductance module includes current transformer and voltage transformer；
Front voltage current acquisition module includes voltage collection circuit and current collection circuit；
Voltage transformer is connected with voltage collection circuit, and current transformer is connected with current collection circuit.
Preferably, the MCU processors are also associated with memory module and communication module.
Preferably, the MCU processors are also associated with synchronization module and time module.
Preferably, the power quality analysis module is measurement IC ATT7022B.
Preferably, the MCU processors are LPC1114 single-chip microcomputers.
It is using the beneficial effect of above technical scheme：The electric energy detection metering system of the utility model structure is that multiple spot is same
When the electric energy quality test sampler instrument tested and corresponding test data process software.
Energy quality and the impact analysis to energy consumption are carried out to localized network, finding out affects the principal element of energy consumption, simplified
Measuring system, reduces cost, alleviates the labour intensity of metrological personnel.
Current-voltage transformer part by the electric current on power line with voltage conversion into the signal of 100V/5A, complete electric current
Work with the initial acquisition of voltage.Then by voltage x current Acquisition Circuit by the 100V/5A power frequency components obtained from transformer
It is converted into being adapted to the AC signal of A/D collections in ATT7022B pieces.Wherein 16,7 tunnel of ATT7022B Embeddeds A/D conversions
Device, it mainly completes the collection to voltage and current, AD conversion, Digital Signal Processing, the various required parameters of calculating.
ATT7022B can measure each phase and the active power, reactive power, apparent energy, active energy and the nonfunctional that close phase
Amount, while the parameters such as each phase current, voltage effective value, power factor, phase angle, frequency can also be measured, and surveys to active power
Amount is up to state standards 0.55,0.25, national 2 grades, 3 grades of standards can be reached to wattless power measurement precision, while the product
It is also the low-power consumption product of a strong antijamming capability.
Description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the schematic diagram of voltage collection circuit；
Fig. 3 is the schematic diagram of current collection circuit；
Fig. 4 is power supply circuit.
Wherein, 1-- voltage transformers, 2-- current transformers, 3-- voltage collection circuits, 4-- current collection circuits, 5--
Power quality analysis module, 6--MCU processors, 7-- system power supply modules, 8-- memory modules, 9-- communication modules, 10-- are same
Step module, 11-- time modules.
Specific embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with the accompanying drawings.
Fig. 1 shows specific embodiment of the present utility model：A kind of electric energy detection metering system, including it is mutual inductance module, front
Terminal voltage current acquisition module, power quality analysis module 5, MCU processors 6, system power supply module 7；Mutual inductance module and front end
Voltage x current acquisition module is communicated to connect successively with power quality analysis module 5；Power quality analysis module 5 and MCU processors 6
Communicate to connect each other；System power supply module 7 is electrically connected with power quality analysis module 5, MCU processors 6；Including multiple mutual
Sense module and front voltage current acquisition module, mutual inductance module and front voltage current acquisition module are corresponded and arranged；Mutual inductance
Module includes current transformer 2 and voltage transformer 1；Front voltage current acquisition module includes voltage collection circuit 3 and electric current
Acquisition Circuit 4；Voltage transformer 1 is connected with voltage collection circuit 3, and current transformer 2 is connected with current collection circuit 4.
MCU processors 6 are also associated with memory module 8 and communication module, and MCU processors 6 are also associated with the He of synchronization module 10
Time module 11, power quality analysis module 5 is measurement IC ATT7022B, and MCU processors 6 are LPC1114 single-chip microcomputers.
Current-voltage transformer part by the electric current on power line with voltage conversion into the signal of 100V/5A, complete electric current
Work with the initial acquisition of voltage.Then by voltage x current Acquisition Circuit by the 100V/5A power frequency components obtained from transformer
It is converted into being adapted to the AC signal of A/D collections in ATT7022B pieces.Wherein 16,7 tunnel of ATT7022B Embeddeds A/D conversions
Device, it mainly completes the collection to voltage and current, AD conversion, Digital Signal Processing, the various required parameters of calculating.
ATT7022B can measure each phase and the active power, reactive power, apparent energy, active energy and the nonfunctional that close phase
Amount, while the parameters such as each phase current, voltage effective value, power factor, phase angle, frequency can also be measured, and surveys to active power
Amount is up to state standards 0.55,0.25, national 2 grades, 3 grades of standards can be reached to wattless power measurement precision, while the product
It is also the low-power consumption product of a strong antijamming capability.Clock module is to provide time reference for each different measurement module,
Synchronizing signal is coordinated just to realize the synchro measure of each measurement module.MCU processors be the information of whole system cross with
The core of order control, it is main to be responsible for control ATT7O22B, read various electrical energy parameters from ATT7O22B；From storage chip
It is middle to read and store some critical datas；Read the time parameter of clock module；And pass through communication module with upper control end
Carry out data communication.System power supply module provides electric energy for whole module, by selection low energy-consumption electronic device and to various pieces
The analysis of power consumption, it is proposed that from the design of voltage of power transformer secondary terminals power taking, realize power quality analysis module
Passive.The volume of whole module is reduced, module is made suitable for the hyperbaric environment powered without 220V, it is possible to by mould
Block and electric power mutual-inductor overall package, realize the seamless connection of the two.Communication module is for connection to computer terminal and reads measurement
Data.
Time module we select a integrated time chip DS1302, it can to year, the moon, week, day, when, minute, second
Timing is carried out, with leap year compensation function.DS1302 is synchronized with MCU using three-wire interface SPI and communicated, and can pass through MCU
Clock is configured.If the initial value of the time chip of each measurement module is arranged to equally, then each measures mould
Block is achieved that temporal synchronization, measures that (this is with regard to phase while can just realizing each measurement module by MCU and program
When in more personal, because the respective wrist-watch time is identical, thus can take in the time of agreement and seek unity of action).Synchronous mould
The effect of block is exactly to assign an identical value simultaneously for the time chip of each measurement module, make they realize it is synchronous (equivalent to
Multiple wrist-watches are adjusted to unified time).Detailed process is that the synchronous port of each measurement module is connected together, and is given in outside
One trigger, the MCU of each measurement module is detected after this signal, when just the initial value appointed being write into respective
Between chip, reach the purpose of time synchronized.In fact because to the crystal oscillator of DS1302 offer clock signals, its error is very little, this
Even if sample works 1 year, the time difference of each measurement module is also Millisecond.Therefore, time synchronized operation has simply just started same
Walk, use below then need not be synchronized.
The effect of Current Voltage Acquisition Circuit is：By voltage collection circuit and current collection circuit, will be from electric power mutual inductance
The l00V/5A power frequency components that device secondary terminals are obtained are converted into being adapted to the AC signal of AD collections in ATT7022B pieces.Wherein
In 10mV to 1V, linearity error is less than 0.5% to the voltage channel of ATT7O22B；Current channel in 2mV to 1V, linearity error
Less than 0.5%.So when a/d converter is accessed and is input into, the input rated value of voltage selects 0.4V；Electric current input rated value choosing
Select 0.1V.Simultaneously based on anti-interference and measurement precision consideration, the input mode of AD conversion is Differential Input.Three phase metering core
The voltage sample of piece can be carried out the 100V power frequencies of input point so that using 3 kinds of modes, first method is the mode of electric resistance partial pressure
Pressure, then passes to again the AD interfaces of computation chip；Second is directly to carry out transformation with voltage transformer, obtains the exchange letter for needing
After number, export to the AD interfaces of computation chip；The third method is first voltage signal to be become into current signal by resistance, then is led to
Overcurrent transformer carries out the conversion of electric current, finally by precision resistance, current signal is reduced into into voltage signal.This 3 kinds of sides
Formula respectively has pluses and minuses, and first kind of way cost is very low, but because being to be directly connected to l00V industrial-frequency alternating currents, selected element in circuit
High-power components are, and alternating current disturbance cannot be isolated, be readily incorporated interference；The second way, directly utilizes
Voltage transformer carries out voltage transformation, is guaranteeing that isolation is jamproof simultaneously, also ensure that accuracy, but l00V/0.4V
Voltage transformer needs especially to have made to order, buys and its inconvenient, lacks practicality；The third mode, voltage first becomes electric current, then
Anti-interference and accuracy are may insure using the method for current transformer, so the mode that have chosen the third voltage transformation is
AD conversion provides suitable input voltage.Understand to be to avoid being higher than the miscellaneous of folding frequency when to signal sampling according to sampling thheorem
Scattered frequency spectrum causes spectrum confusion into sampler, and the prepositive low frequency filter of a protectiveness is usually added before sampler, prevents high frequency
Rate component is entered.Use RC low-pass filter circuits here to process the signal of transformer rear end.Due to AD inputs
Mode is Differential Input, and according to the requirement that ATT7022B pieces interior biasing is amplified, input voltage is 0 to 3V, so in original exchange
In basis of signals, DC offset voltage is added, it is ensured that the stability of reference voltage and the precision of measurement.
Research according to more than to voltage collection circuit, designs voltage collection circuit as shown in Figure 2.
In the same manner, current signal sampling carries out the collection of current signal using current transformer, then current signal is changed into
O.1V voltage signal, then by anti-aliasing circuit and adds the bias voltage of 2.45V, finally sends into the A/D conversions of electric current
Mouthful, current collection circuit is as shown in Figure 3.
Power quality analysis module, it mainly completes the collection to voltage and current, AD conversion, Digital Signal Processing, meter
Calculate various required parameters.The performance of chip directly determines the property indices of metering module, therefore selected electric energy meter
Amount chip needs higher precision.Additionally due to the environment of power quality analysis module application is all more complicated, therefore need
Electric energy computation chip is wanted to have stronger antijamming capability.Also, because whole system employs the electricity from electric power mutual-inductor power taking
Source is designed, and in order to reduce the impact to electric power mutual-inductor, to select the electric energy computation chip of a low-power consumption.Comprehensive various electric energy
The characteristic and function of computation chip, it is believed that the ATT7022B of Actions Semiconductor Co., Ltd is relatively adapted to the system
For the requirement of electric energy computation chip.ATT7022B can measure each phase and close active power, reactive power, the apparent work(of phase
Rate, active energy and quadergy, while each phase current, voltage effective value, power factor, phase angle, frequency etc. can also be measured
Parameter, and be up to state standards 0.55,0.25 to wattful power messurement, country 2 can be reached to wattless power measurement precision
Level, 3 grades of standards, while the product is also the low-power consumption product of a strong antijamming capability.
In the register that the electric energy metrical value of power quality analysis module is stored in inside computation chip ATT7O22B, for
MCU reads at any time, very convenient.But when ATT7O22B resets or power down, the numerical value in this register can be by clear at once
Zero, data also can lose simultaneously, and this is accomplished by a memory for being capable of power down preservation, and the moment is carried out more to electric energy metrical value
It is new to preserve；When module is run per at regular intervals (by program setting, it is assumed that be set as 10s here), MCU will be to metering
Chip reads primary parameter value, and electric energy metrical value is re-write memory, will store such a moon 259200 times, because
This needs a can repeatedly read and write multiple, non-volatile external memory storage；This project selection is based on FRAM technologies
FM24C25.Its storage time is short；And read-write number of times is more than 1,000,000,000 times, by monthly 259200 times calculating, can make
It was also simultaneously a low-power chip with more than 100 years.Its performance indications are fully achieved design requirement, solve the quality of power supply
Design of the analysis module in terms of storage is worried.
The stable operation of whole system, needs good, stable power unit to provide safeguard.The system of one excellent in design
Supply module can ensure that the accurate of the normal operation of whole detection metering module and measurement.General electric energy detection analytical equipment is adopted
All it is following two modes：One is external 220V power frequency supplies, then 220V power frequency supplies is carried out into transformation, rectification, filter
Ripple, eventually becomes the direct current for being available for system to work, and the advantage of so design can be the stability for fully ensuring that system power supply,
With the precision of measurement；Have the disadvantage that volume is big, and the input point device that must have external power supply could work, and electric power mutual-inductor
Some use ranges for not having largely to limit equipment in the high voltage power distributing cabinet of 220V power supplys are placed on mostly.In addition
A kind of is, using the method for battery, equipment to be directly powered, and the advantage of so design is to eliminate external power supply, is expanded
The use range of detection metering module, improves the flexibility of equipment, has the disadvantage to need periodic replacement battery, if equipment is laid
Some do not allow it is accessible where, just especially bother, and with the decline of cell voltage, very big mistake can be produced to measurement
Difference affects.This module power part is adopted from power taking in the secondary output end of electric power mutual-inductor, to detect that metering module provides electricity
Power support, makes power quality analyzer passive.Such design not only eliminates the dependence to external 220V power frequency supplies, together
When can guarantee that again whole module good power supply and measurement accuracy, expand the use range of power quality analysis module,
And module and electric power mutual-inductor overall package can be realized the seamless connection of the two.
Two requirements must are fulfilled for from power taking on voltage of power transformer：First supply voltage must be stablized, and fluctuation is not
More than positive and negative 5%, the accurate of measurement is so just can guarantee that.It two is that power consumption is little as far as possible, to reduce detection metering module
Reaction to voltage of power transformer.In the case of substantially constant, this will for the power consumption of each chip in the module
Ask AC-DC conversion efficiency will as far as possible it is high, reduce conversion when energy loss.AC-DC mainly has two methods：The first
Voltage transformation is carried out using transformer, high-voltage alternating is transformed into into low-voltage alternating-current, then carry out rectifying and wave-filtering, become and be available for module to make
Direct current, the advantage using the method is simple structure, with low cost；Have the disadvantage that volume is larger, conversion efficiency is relatively low, lead to
Often the conversion efficiency of transformer can only achieve 70% one 80%, cause more energy loss, and the output voltage of transformer
Change with the secondary voltage change of voltage of power transformer, in turn result in larger output voltage fluctuation.Another kind of method
It is that using switching system supply module, the advantage using switching system supply module is small volume, high conversion efficiency, conversion efficiency
More than 90% can be reached, and relatively wide to the scope of input voltage, though the secondary output voltage of electric power mutual-inductor have compared with
Change on a large scale, the voltage of power unit output is still stable, has the disadvantage that price is higher.
Consider from both the stability and conversion efficiency of electric power output voltage, choose switching system supply module
AC-DC is designed, and is that passive power quality analysis module is powered.Wherein Switching Power Supply selects the height of ampere-hour victory (ANSJ) company
Quality switching system supply module, wide range input voltage 75V～260V, power output 3W, output voltage fluctuation range is positive and negative
1%, the power requirement for surveying metering module can be met completely.Power unit circuit diagram using this module is as shown in Figure 4.
MCU processors are the cores that the information of whole system crosses with order control, are mainly responsible for control
ATT7022B, from ATT7O22B various electrical energy parameters are read；Some critical datas are read and stored from storage chip, will be detected
Data communicated with upper control end by port.Further, since the power supply of whole system is employed from voltage of power
The design of transformer secondary terminals power taking, in order to reduce the impact to voltage of power transformer, the power consumption of MCU is low as far as possible.
Therefore need to select a MCU for meeting function above, strong antijamming capability and low-power consumption.Here we select PHLIPS public
The LPC1114 single-chip microcomputers of department, it to be mainly characterized by processing speed fast, the features such as low-power consumption, and self-carried USB, UART, SPI etc.
Serial ports.Can complete to control, calculate, communication task can meet the requirement of low-power consumption again.
The function of communication module is for completing to carry out data transmission between computer and measurement module.In view of transmission data
Amount and rate request, this problem proposes two schemes, and one kind is that using RS232 mouths, one kind is USB port, and both interfaces are equal
Carry for LPC1114, using very convenient.
Above-described is only preferred embodiment of the present utility model, it is noted that for the ordinary skill of this area
For personnel, on the premise of design is created without departing from the utility model, some deformations and improvement can also be made, these all belong to
In protection domain of the present utility model.
Claims (5)
1. a kind of electric energy detection metering system, it is characterised in that including mutual inductance module, front voltage current acquisition module, electric energy
Quality analysis module, MCU processors, system power supply module；
Mutual inductance module and front voltage current acquisition module are communicated to connect successively with power quality analysis module；
Power quality analysis module and MCU processors are communicated to connect each other；
System power supply module is electrically connected with power quality analysis module, MCU processors；
Including multiple mutual inductance modules and front voltage current acquisition module, mutual inductance module and front voltage current acquisition module are one by one
It is correspondingly arranged；
Mutual inductance module includes current transformer and voltage transformer；
Front voltage current acquisition module includes voltage collection circuit and current collection circuit；
Voltage transformer is connected with voltage collection circuit, and current transformer is connected with current collection circuit.
2. electric energy detection metering system according to claim 1, it is characterised in that the MCU processors are also associated with depositing
Storage module and communication module.
3. electric energy detection metering system according to claim 1, it is characterised in that the MCU processors are also associated with together
Step module and time module.
4. electric energy detection metering system according to claim 1, it is characterised in that the power quality analysis module is meter
Amount chip ATT7022B.
5. electric energy detection metering system according to claim 1, it is characterised in that the MCU processors are that LPC1114 is mono-
Piece machine.
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| CN201621005797.5U CN206096293U (en) | 2016-08-30 | 2016-08-30 | Power detection measurement system |
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| CN201621005797.5U CN206096293U (en) | 2016-08-30 | 2016-08-30 | Power detection measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124909A (en) * | 2016-08-30 | 2016-11-16 | 淮北工科检测检验有限公司 | A kind of electric energy detection metering system |
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- 2016-08-30 CN CN201621005797.5U patent/CN206096293U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124909A (en) * | 2016-08-30 | 2016-11-16 | 淮北工科检测检验有限公司 | A kind of electric energy detection metering system |
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