CN202870166U - Weak input type intelligent electric meter - Google Patents
Weak input type intelligent electric meter Download PDFInfo
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- CN202870166U CN202870166U CN 201220529314 CN201220529314U CN202870166U CN 202870166 U CN202870166 U CN 202870166U CN 201220529314 CN201220529314 CN 201220529314 CN 201220529314 U CN201220529314 U CN 201220529314U CN 202870166 U CN202870166 U CN 202870166U
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Abstract
The utility model discloses a weak input type intelligent electric meter, comprising a CPU. The weak input type intelligent electric meter is characterized in that after performing treatments of isolation, anti-aliasing, filtering, sampling offset superposition, etc. on three-path voltage channel weak input signals and three-path current channel weak input signals, a weak input signal electric energy metering circuit is accessed; the weak input signal electric energy metering circuit is connected with the CPU; and the weak input signal electric energy metering circuit is isolated by a photocoupler, and outputs an active power electric energy pulse and a reactive power electric energy pulse. The weak input type intelligent electric meter is convenient in field use and maintenance, and satisfies the basic technical requirements of intelligentized stations such as intelligent substations for intelligent equipment and the requirement for a measurement unit.
Description
Technical field
The utility model relates to a kind of intelligent electric meter, belongs to the measurement of power field of instrumentation technology.
Background technology
Development along with technology, digital transformer substation has adopted the unconventional mutual inductors such as electronic mutual inductor, and its output form is for following the simulation small-signal of " IEC60044-7-1999 mutual inductor the 7th portions of electronics formula voltage transformer (VT) ", " IEC60044-8-2002 mutual inductor the 8th portions of electronics formula current transformer " standard; Do not reach simultaneously the low pressure tradition mutual inductor of replacement in the intelligent substation transformation, and the low tension minor mutual inductor of some and low-voltage intelligent merge cells coupling, the weak signal of its output do not follow fully yet＜＜Q-GDW424-2010 electronic current mutual inductor technical manual etc. relevant criterion; These simulation small-signals and weak output signal for the current and voltage signals that tradition relies on the energy transmission of information, have the feature of low voltage and low power, for receiving element, all are considered as weak input signal.The problem how direct on the spot installation table meter measures weak input signal is all proposed at present both at home and abroad; Consider that the unconventional mutual inductors such as this class electric energy meter and electronic mutual inductor match, be used for the intelligent stations such as Intelligent transformer station, the electric energy meter that weak input signal is measured also should possess intelligent characteristic, satisfies intelligent substation to the requirement of smart machine; The related request that also should meet simultaneously the national metrological regulations system as a measuring products.
Have no the relevant smart machine report that weak input signal is measured processing both at home and abroad, this minute Electric Energy Metering Technology and intelligent characteristic inquire into respectively;
1) Electric Energy Metering Technology scheme
At present typical electric energy metrical scheme has following several:
A) single-chip microcomputer main control units such as (or) programming devices+AD(AD: modulus conversion chip)
Front end becomes voltage signal to input voltage passage, current channel signal respectively through voltage isolating transformer, electric current isolating transformer; Perhaps obtain voltage signal with the precision resister dividing potential drop; After processing through filtering, impedance matching etc., be input to the AD chip, sampling obtains discrete data, sends to the main control units such as single-chip microcomputer or programming device, then main control unit is processed data, the electric flux of picked up signal effective value, metering circuit etc.
B) single-chip microcomputer main control units such as (or) programming devices+the special metering IC
Front end input current passage, voltage channel signal, be isolated transformer or resistance conversion becomes voltage signal, after the processing such as filtering, stack bias voltage, impedance matching, be input to special computation chip, the relevant settings that it is assigned according to main control unit, to the signal calculating of sampling, and the electric flux of output signal effective value, metering circuit is waited until main control unit; Main control unit also is responsible for proofreading and correct the deviation of computation chip simultaneously;
C) digital sample values input interface+CPU(or DSP)
This is a kind of metering method that electric energy meter adopts in the intelligent substation that occurs recently, electric energy meter is by the digital sample values input interface, reception is measured under the circuit, meet the sampled value Frame of the standard such as IEC61850.9-1 9-2 9-2LE, obtain the discrete sampling value of certain sampling rate, then by CPU or DSP sampled point is calculated, obtain the information that metering circuit effective value, electric energy value etc. need.
2) smart metering device
Using many smart metering devices at present is intelligent substation electric energy meter, and it has following characteristics at least:
A) contain the fiber optic Ethernet mouth, accessible IEC61850.9-1 9-2 9-2LE sampled value transmission network; B) contain the RJ45 Ethernet interface, the accessible described MMS communication network of IEC61850.8-1:
C) the electric energy value has good interoperability based on the descriptive modelling of IEC61850 standard, satisfies with other IED such as electric energy main website, transformer station backstages mutual.
Present stage, generally adopt the first scheme to gather to weak input signal both at home and abroad, obtain the phase Bit Significance of input signal etc.; Have no the Related product report that weak input signal is measured processing both at home and abroad.
At home in the intelligent substation, the smart metering device intelligent substation electric energy meter is used more extensive, but also exists several places not enough at present:
1) the transmission of data characteristic Network Based exists data to lose a little, and message transmissions postpones, network storm, the problems such as the reliability of long-time running; But the digital intelligent ammeter does not have unified standard and vertification regulation at present, present stage is to the calibrating of digitizing intelligent electric meter, generally carry out on GB-T17215.211, GB-T17215.322 basis, but requirement and indefinite, so that there are doubt in metering competent authorities and user;
2) be different from traditional electric energy meter, the intelligent substation electric energy meter installation is safeguarded comparatively complicated, needs the MAC Address of situ configuration respective channels, the links such as sampling channel number, and before putting into operation, confirm;
3) the measurement loop transmission link of intelligent substation electric energy meter is comparatively numerous and diverse, at least through 3 layers of transmission: electronic mutual inductor is to merge cells, merge cells is to optical switch (or fibre distribution frame etc.), and optical switch is to electric energy meter, and this causes whole measurement loop reliability to reduce.
Present stage, its application in intelligent stations such as intelligent substations also has limitation for traditional electric energy meter:
1) the large current signal of large voltage of traditional electric energy meter access, rely on the energy transmission of information, can not match with the unconventional mutual inductor such as electronic mutual inductor, need the intelligent station such as intelligent substation to be specially its design and installation traditional electrical magnetic-type or capacitance type mutual inductor;
2) traditional electric energy meter generally takes single-chip microcomputer main control units such as (or) programming devices to add the hardware structure of the special metering IC, can not satisfy the intelligent stations such as intelligent substation to the basic fundamental requirement of smart machine.
The utility model content
Technical problem to be solved in the utility model provides a kind of electric energy meter for weak input signal is measured, and satisfies the intelligent stations such as intelligent substation to the basic fundamental requirement of smart machine.
For solving the problems of the technologies described above, the utility model provides a kind of weak imported intelligent electric meter, comprise CPU, it is characterized in that: the weak input signal of 3 road voltage channels, the weak input signal of 3 road current channels after isolation, anti-aliasing, filtering, stack sample-offset etc. are processed, the weak input signal ic for energy metering of access; Weak input signal ic for energy metering links to each other with CPU; Weak input signal ic for energy metering is through light-coupled isolation output active energy pulse and reactive energy pulse.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU links to each other with energy data traditional communication interface, energy data Intelligent Communications Interface respectively, described energy data traditional communication interface comprises RS485 interface, infrared interface, and described energy data Intelligent Communications Interface is RJ45 type network interface.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU is 32 floating-point operation CPU of double-core.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU links to each other with liquid crystal display.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU links to each other with button.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU links to each other with data storage cell.
Aforesaid weak imported intelligent electric meter, it is characterized in that: described CPU links to each other with clock, battery.
Aforesaid weak imported intelligent electric meter is characterized in that: described CPU load document system, be used for preserving the metering related datas such as the configuration of metering and correction coefficient with document form, and be used for realizing the intelligent communication functions such as remote intelligent calibration, intelligent meter reading.
The beneficial effect that the utility model reaches:
Intelligent electric meter of the present utility model can be directly matches with the unconventional mutual inductor such as electronic mutual inductor, also can with not exclusively follow Q/GDW-424＜＜the electronic current mutual inductor technical manual etc. the low voltage mutual inductor of relevant criterion cooperate, reliability is high; The site operation easy-to-connect does not need the scene that measuring parameter is set; Voltage channel signal and the current channel signal of the output of tradition calibration console for electric energy meter all are high-power voltage (electric current) signals, rely on energy to come transmission of information, the weak signal that receives from weak imported intelligent electric meter is different, therefore can not directly carry out verification to weak imported electric energy meter, the utility model can directly access traditional calibration console for electric energy meter by signal source generation module and carry out verification, and overall measuring accuracy reaches meritorious 0.2S level, idle 2.0 grades.
Intelligent electric meter of the present utility model needs related data by the file system management First Astronautic Research Institute for Measurement and Test, can use the file related service of " MMS " Communications service interface of existing IEC61850-8-1 description, long-rangely directly obtain replacement, the intelligent stations such as intelligent substation are satisfied to the basic fundamental requirement of smart machine in the seamless Intelligent electric power system stations such as Intelligent transformer station that incorporate; There are not the problems such as the peculiar packet loss of digital sample values input interface is out of order in the continuous weak input signal of weak imported intelligent electric meter access, follows simultaneously the correlation standard such as the existing multifunctional meter of country, meets the national metrological regulations system.
Description of drawings
Fig. 1 is the structural representation of intelligent electric meter of the present utility model.
Embodiment
The utility model adopts 32 of double-cores to support high precision floating-point operation CPU, cooperates the framework of weak input signal ic for energy metering; Access such as the secondary simulation small-signal of following the IEC60044-7/8 standard etc. has the weak input signal of low voltage and low power feature;
After wherein the weak input signal of 3 road voltage channels, the weak input signal of 3 road current channels carry out the measures such as necessary isolation, anti-aliasing, filtering, stack sample-offset, the weak input signal ic for energy metering of access, the special metering IC in the metering circuit carries out computing according to CPU to its initialized register value, send active energy pulse, reactive energy pulse, its precision reaches 2.0 grades of active energy 0.2S level, reactive energies;
CPU is by data bus, and the timer access computation chip obtains the data such as active energy, reactive energy, current/voltage amplitude phase place, transmission line of electricity frequency, and arranges according to the user, and these data are carried out respective handling; Described CPU links to each other with liquid crystal display, button, data storage cell, clock, battery.
Before weak imported intelligent electric meter dispatches from the factory, need to carry out verification to it, the utility model is by high-precision current/voltage changer, current/voltage output signal to traditional calibration console for electric energy meter is carried out conversion, its input end accesses the output terminal of common high precision tester, and converter output terminal connects the input of weak input signal metering module; The signal of high voltage or large electric current, be transformed to the low voltage and low power weak signal that meets field demand, these weak signals are linked into the metering circuit input end of weak imported intelligent electric meter, existing common verification stage body be can utilize, correction and check to weak imported intelligent electric meter realized simply and easily.
The utility model has loaded a file system, realizes the file related service of " MMS " Communications service interface that IEC61850-8-1 describes, to realize the intelligent communication function.
The utility model is preserved the metering related datas such as the configuration of metering and correction coefficient with document form, when restarting measurement loop, CPU resolves the configuration of metering file and correction coefficient file at every turn, by data bus, and the initialization computation chip; When carrying out error correction, according to check results, distance host is revised the correction coefficient file by the Intelligent Communications Interface access, can carry out the remote intelligent adjustment to weak imported electric energy meter online.
The utility model metering intermediate link is few, reliability is high, on-the-spot working service is convenient, satisfy that the intelligent station such as intelligent substation requires the basic fundamental of smart machine and to the metering units specific (special) requirements.
Intelligent automatic checking meter: weak imported intelligent electric meter uses to meet " MMS " Communications service interface of IEC61850-8.1 standard to describe and have and meets the data model that the IEC61850-7 part of standards is described, copy the distant place intelligence systems such as collection terminal or background system with electric energy and carry out the electric energy measurement data exchange, data exchange process does not need human intervention, system's automatic data collection generates predetermined information report, and metering units is controlled.
Intelligent Communications Interface: in electric system, expression meets the communication interface of IEC61850 communication specification.
Claims (8)
1. imported intelligent electric meter a little less than a kind comprises CPU, it is characterized in that: the weak input signal of 3 road voltage channels, the weak input signal of 3 road current channels after isolation, anti-aliasing, filtering, stack sample-offset are processed, the weak input signal ic for energy metering of access; Weak input signal ic for energy metering links to each other with CPU by data bus; Weak input signal ic for energy metering is through light-coupled isolation output active energy pulse and reactive energy pulse.
2. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU links to each other with energy data traditional communication interface, energy data Intelligent Communications Interface respectively, described energy data traditional communication interface comprises RS485 interface, infrared interface, and described energy data Intelligent Communications Interface is RJ45 type network interface.
3. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU is 32 floating-point operation CPU of double-core.
4. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU links to each other with liquid crystal display.
5. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU links to each other with button.
6. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU links to each other with data storage cell.
7. weak imported intelligent electric meter according to claim 1, it is characterized in that: described CPU links to each other with clock, battery.
8. weak imported intelligent electric meter according to claim 1 is characterized in that: described CPU load document system, be used for preserving the metering related data that comprises the configuration of metering and correction coefficient with document form, and be used for realizing the intelligent communication function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529314 CN202870166U (en) | 2012-10-16 | 2012-10-16 | Weak input type intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529314 CN202870166U (en) | 2012-10-16 | 2012-10-16 | Weak input type intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870166U true CN202870166U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220529314 Expired - Lifetime CN202870166U (en) | 2012-10-16 | 2012-10-16 | Weak input type intelligent electric meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323666A (en) * | 2013-06-24 | 2013-09-25 | 国电南京自动化股份有限公司 | Integrated type electric power measurement module |
-
2012
- 2012-10-16 CN CN 201220529314 patent/CN202870166U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323666A (en) * | 2013-06-24 | 2013-09-25 | 国电南京自动化股份有限公司 | Integrated type electric power measurement module |
| CN103323666B (en) * | 2013-06-24 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Integrated form electric energy metering module |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |