CN209069996U - A kind of intelligent electric energy meter having voltage dip monitoring function - Google Patents
A kind of intelligent electric energy meter having voltage dip monitoring function Download PDFInfo
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- CN209069996U CN209069996U CN201821622513.6U CN201821622513U CN209069996U CN 209069996 U CN209069996 U CN 209069996U CN 201821622513 U CN201821622513 U CN 201821622513U CN 209069996 U CN209069996 U CN 209069996U
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Abstract
The utility model provides a kind of intelligent electric energy meter for having voltage dip monitoring function, including power module, signal conditioning module, A/D sampling module, transient measurement module, electric energy metering module, voltage dip monitoring modular, data recordin module.The beneficial effects of the utility model are: 1. sample correlation module and flow chart of data processing by compatible front-end, the shared of resource is realized；2. in turn ensuring that the two function is unaffected by monitoring two independent flow chart of data processing in rear end separating treatment electrical energy measurement and voltage dip；3. by using super capacitor and detection of power loss process, it is ensured that temporary drop event and related recorder data will not be lost.
Description
Technical field
The utility model relates to power grid electrical energy measurement field more particularly to a kind of intelligence for having voltage dip monitoring function
Electric energy meter.
Background technique
The starting of the bulk loads such as electric power system fault, motor all can cause short time voltage to the current supply circuit closed on
Temporarily drop is even interrupted.With various voltage-sensitive electrical equipments (such as precise electronic manufacturing equipment, computerized equipment,
Microcontroller apparatus etc.) a large amount of uses, endanger caused by voltage dip also increasingly severe.
Current voltage temporarily drops monitoring function mainly by dedicated electric energy quality monitoring terminal or special temporary drop monitor
It completes, overall monitoring cost is high, and is difficult to cover comprehensively.
Utility model content
The utility model provides a kind of intelligent electric energy meter for having voltage dip monitoring function, including power module, letter
Number conditioning module, A/D sampling module, transient measurement module, electric energy metering module, voltage dip monitoring modular, data record mould
Block, the power module are connected with external voltage, the signal conditioning module input terminal respectively with foreign current, the power supply mould
Block is connected, and the A/D sampling module input terminal is connected with the signal conditioning module output end, the A/D sampling module output
End is connected with each input terminal of the transient measurement module, the electric energy metering module, the voltage dip monitoring modular respectively,
The data recordin module input terminal is supervised with the transient measurement module, the electric energy metering module, the voltage dip respectively
Each output end for surveying module is connected.
As a further improvement of the utility model, the signal conditioning module include current transformer, divider resistance and
Operational amplifier, foreign current is converted to low current by the current transformer, then is converted into through the operational amplifier
External voltage partial pressure switch is directly voltage signal needed for A/D is sampled by voltage signal needed for A/D is sampled, the divider resistance.
The data recordin module includes internal storage and external storage as a further improvement of the utility model,
Device, the data that the transient measurement module, the electric energy metering module, the voltage dip monitoring modular are calculated are unified defeated
It out into the data recordin module, is stored in a manner of data structure on the internal storage, while periodically by electric energy
The data that metering, voltage dip event, power grid anomalous event etc. need power down to keep are stored into the external memory.
The intelligent electric meter includes cpu chip, A/D conversion chip, the CPU as a further improvement of the utility model,
A/D conversion chip described in chip controls synchronizes sampling to voltage and current signal, obtains original sample value.
The A/D conversion chip built in the cpu chip as a further improvement of the utility model,.
The external memory is SPI Flash chip as a further improvement of the utility model,.
The power module parallel connection super capacitor, the super capacitor can be protected as a further improvement of the utility model,
Demonstrate,prove the of short duration work power supply of machine system after external voltage route powers off；Meanwhile voltage dip monitoring modular is provided simultaneously with power down
Testing process quickly detects external voltage line voltage value, when the value is not enough to power module at the end of determining temporarily drop
When power supply, then trigger data logging modle will temporarily drop event and recorder data quick storage into nonvolatile memory immediately.
The intelligent electric meter further includes communication module and display module, the number as a further improvement of the utility model,
It is connected respectively with the communication module, the display module according to logging modle output end.
The beneficial effects of the utility model are: 1. sample correlation module and flow chart of data processing by compatible front-end, realize
Resource it is shared；2. by monitoring two independent data processing streams in rear end separating treatment electrical energy measurement and voltage dip
Journey in turn ensures that the two function is unaffected；3. by using super capacitor and detection of power loss process, it is ensured that temporarily drop event and phase
Closing recorder data will not lose.
Detailed description of the invention
Fig. 1 is the intelligent electric energy meter general module block diagram of the utility model；
Fig. 2 is the temporary drop monitoring flow chart of the utility model.
Specific embodiment
As shown in Figure 1, the utility model discloses a kind of intelligent electric energy meter for having voltage dip monitoring function, including electricity
Source module, signal conditioning module, A/D sampling module, transient measurement module, electric energy metering module, voltage dip monitoring modular, number
According to logging modle, the power module is connected with external voltage, the signal conditioning module input terminal respectively with foreign current, institute
It states power module to be connected, the A/D sampling module input terminal is connected with the signal conditioning module output end, the A/D sampling
Module output end respectively with the transient measurement module, the electric energy metering module, the voltage dip monitoring modular it is each defeated
Enter end be connected, the data recordin module input terminal respectively with the transient measurement module, the electric energy metering module, the electricity
Each output end that monitoring modular temporarily drops in pressure is connected.
The signal conditioning module includes current transformer, divider resistance and operational amplifier, and the current transformer will
Foreign current is converted to low current, then through the operational amplifier be converted into A/D sample needed for voltage signal, described point
External voltage partial pressure switch is directly voltage signal needed for A/D is sampled by piezoresistance.
External three-phase voltage is linked into signal conditioning module simultaneously, and being converted to external voltage using electric resistance partial pressure mode can
For ± 5V the simulation small-signal of A/D sampling；Signal conditioning module accesses three-phase current simultaneously, use instrument current transformer+
Operational amplifier mode realizes that current signal is converted, and wherein foreign current is converted to mA grades of low currents by instrument current transformer,
± 5V voltage signal is converted into using operational amplifier.
The data recordin module includes internal storage and external memory, the transient measurement module, the electric energy
The data that metering module, the voltage dip monitoring modular are calculated uniformly are output in the data recordin module, with number
It is stored on the internal storage according to structural body mode, while periodically by electrical energy measurement, voltage dip event, power grid exception thing
The data that part etc. needs power down to keep are stored into the external memory.
The intelligent electric meter includes cpu chip, A/D conversion chip, and the cpu chip controls the A/D conversion chip, to electricity
Current voltage signal synchronizes sampling, obtains original sample value.The A/D conversion chip built in the cpu chip.
The external memory is SPI Flash chip, and the SPI FLASH chip that present case uses is magnificent nation
W25Q128JVSIQ, the chip capacity are 16MB, can satisfy electric energy meter, voltage dip monitoring and dependent failure recording to data
The requirement of storage.
Wherein, sample rate is 128 points/cycle, for standard mains frequency 50Hz, corresponding sample frequency 6400kHz；
To avoid the inconsistent caused spectral leakage of frequency, every 1s measures mains frequency on software, and according to newest frequency
Carry out controlling of sampling.
Above-mentioned original sample value is respectively supplied to following three module, is calculated in different data using algorithms of different
Hold:
1) electric energy metering module uses 10 cycle virtual value integral algorithms, calculates active and reactive power, temporally carries out
It is accumulative, obtain the total and active and reactive electric energy of split-phase；Meanwhile according to rate parameter, the active and reactive electric energy of each rate is calculated；According to
Requirement parameter calculates real-time requirement, maximum demand；
2) voltage dip module uses half cycles virtual value integral algorithm, calculates voltage half-wave virtual value, and by its with
The definite value of setting is compared, and judges whether that voltage dip event occurs according to GB/T 30137-2013 standard.Such as correspond to
Event then records event argument, and triggers recording, and 6 cycles are former after recording voltage temporarily drops, preceding 2 cycle, generation occur for short interruptions
Beginning sampled value；
3) transient measurement module use 50 cycle virtual value integral algorithms, calculate voltage, electric current, power, power factor,
The basic electricity such as frequency, while carrying out the electricity such as over-voltage, under-voltage, overcurrent, undercurrent, power is out-of-limit, power factor is out-of-limit, frequency out-of-limit
Net anomalous event records judgement processing.
Power module 5V side parallel connection super capacitor, capacitance 20F, the super capacitor can guarantee external voltage route
The of short duration work power supply of machine system after power-off, continuing working power-on time is 2 minutes.
Power module uses PT power supply mode, accesses external three-phase voltage, PT voltage is converted to 5V by Switching Power Supply,
3.3V, 1.8V are converted by voltage transformation chip again, used for entire hardware system.Wherein, power supply be designed as three-phase/
When two-phase is powered, every phase 35V can meet complete machine power reguirements；When single phase power supply, 49V meets complete machine power reguirements.
The intelligent electric meter further includes communication module and display module, and the data recordin module output end leads to described respectively
Believe that module, the display module are connected.
Communication, display module are according to external communication interface, man-machine interface query requirement, reads data log module dependency number
According to being returned by communication link or shown by man-machine interface.Communication module uses RS485 link in present case, passes through
DL/T645 agreement carries out data interaction, and wherein the agreement extends voltage dip, recorder data phase based on electric energy meter standard
Close data upload function.
The influence that intersects after merged in terms of two big functions to avoid electrical energy measurement and voltage dip from monitoring, in data flow
On separating treatment is carried out to it, related data stream interface is as shown in Figure 1.Wherein 1., 2. data stream interface shares interface, generates
Crude sampling Value Data respectively after electric energy metering module, voltage dip module, transient measurement module calculation processing, respectively
By interface 3., 4., be 5. aggregated into data recordin module, classified to it, separate storage, later communication module, display mould
When block asks for data by interface 6., data recordin module obtains data content from different storage zone according to data type.
It is (fixed by standard when voltage dip depth is larger, the duration is longer since electric energy meter uses PT power supply mode
Justice, up to 1 minute), electric energy meter will be unable to complete documentation and temporarily drop process and store in time, cause temporarily to drop losing for monitoring event
It loses.For this purpose, increase detection of power loss process in voltage dip monitoring modular, it is specific as shown in Figure 2.Under normal circumstances, data are remembered
Record module is updated judgement to the temporary every 10s of drop event, and when new temporary drop event occurs, temporary drop event and recorder data are deposited
It stores up in SPIFLASH；After increasing detection of power loss process, at the end of determining temporarily drop, external voltage line voltage value is detected,
(two-phase voltage is appointed to be less than 35V, another phase voltage is less than 49V) when the value is not enough to power module power supply, then temporarily drop occurs
Trigger data logging modle quick storage immediately afterwards, by newest temporary drop event and recorder data storage into SPI FLASH.
Intelligent electric energy meter is distributed in electricity as one of building Electric Energy Telemetering System, the critical component of the advanced measurement system of AMI
Each node of net, covering are comprehensive；And intelligent electric energy meter itself has also all accessed identical voltage signal and has been sampled, with electricity
Temporarily drop function has identical data source to pressure.It is a comparison for this purpose, integrating voltage dip monitoring function in intelligent electric energy meter
Ideal selection.
Voltage dip monitoring function is integrated in intelligent electric energy meter, emphasis solves the problems, such as the two function fusion, it is ensured that increases
It will not influence the original performance requirement of intelligent electric energy meter after temporarily drop monitoring, carry out reasonable functional module division thus, while soft
The two is efficiently separated in part Data Stream Processing, avoids influencing each other.
The beneficial effects of the utility model are: 1. sample correlation module and flow chart of data processing by compatible front-end, realize
Resource it is shared；2. by monitoring two independent data processing streams in rear end separating treatment electrical energy measurement and voltage dip
Journey in turn ensures that the two function is unaffected；3. by using super capacitor and detection of power loss process, it is ensured that temporarily drop event and phase
Closing recorder data will not lose.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (8)
1. a kind of intelligent electric energy meter for having voltage dip monitoring function, it is characterised in that: including power module, signal condition mould
Block, A/D sampling module, transient measurement module, electric energy metering module, voltage dip monitoring modular, data recordin module, the electricity
Source module is connected with external voltage, and the signal conditioning module input terminal is connected with foreign current, the power module respectively, institute
A/D sampling module input terminal is stated to be connected with the signal conditioning module output end, the A/D sampling module output end respectively with institute
It is connected to state transient measurement module, the electric energy metering module, each input terminal of the voltage dip monitoring modular, the data note
Record module input respectively with the transient measurement module, the electric energy metering module, the voltage dip monitoring modular it is each
Output end is connected.
2. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 1, it is characterised in that: described
Signal conditioning module includes current transformer, divider resistance and operational amplifier, and the current transformer converts foreign current
For low current, then through the operational amplifier it is converted into voltage signal needed for A/D is sampled, the divider resistance directly will be outer
Portion's voltage is converted to voltage signal needed for A/D is sampled.
3. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 1, it is characterised in that: described
Data recordin module includes internal storage and external memory, the transient measurement module, the electric energy metering module, described
The data that voltage dip monitoring modular is calculated uniformly are output in the data recordin module, are deposited in a manner of data structure
It stores up on the internal storage, while periodically needing power down to protect electrical energy measurement, voltage dip event, power grid anomalous event etc.
The data held are stored into the external memory.
4. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 1, it is characterised in that: the intelligence
Can ammeter include cpu chip, A/D conversion chip, the cpu chip controls the A/D conversion chip, to voltage and current signal into
Row synchronized sampling, obtains original sample value.
5. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 4, it is characterised in that: described
The A/D conversion chip built in cpu chip.
6. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 3, it is characterised in that: described
External memory is SPI Flash chip.
7. the intelligent electric energy meter according to claim 1 for having voltage dip monitoring function, it is characterised in that: the power supply
Wired in parallel super capacitor, the super capacitor can guarantee the of short duration work power supply of machine system after the power-off of external voltage route.
8. a kind of intelligent electric energy meter for having voltage dip monitoring function according to claim 1, it is characterised in that: the intelligence
Can ammeter further include communication module and display module, the data recordin module output end respectively with the communication module, described
Display module is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821622513.6U CN209069996U (en) | 2018-09-30 | 2018-09-30 | A kind of intelligent electric energy meter having voltage dip monitoring function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821622513.6U CN209069996U (en) | 2018-09-30 | 2018-09-30 | A kind of intelligent electric energy meter having voltage dip monitoring function |
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| Publication Number | Publication Date |
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| CN209069996U true CN209069996U (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821622513.6U Expired - Fee Related CN209069996U (en) | 2018-09-30 | 2018-09-30 | A kind of intelligent electric energy meter having voltage dip monitoring function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
| CN114047376A (en) * | 2021-09-27 | 2022-02-15 | 宁波三星智能电气有限公司 | Voltage sag event detection method for double-core electric energy meter |
-
2018
- 2018-09-30 CN CN201821622513.6U patent/CN209069996U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
| CN114047376A (en) * | 2021-09-27 | 2022-02-15 | 宁波三星智能电气有限公司 | Voltage sag event detection method for double-core electric energy meter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190705 Termination date: 20200930 |