CN204028338U - A kind of merge cells meter characteristic field detecting device - Google Patents

Abstract

The utility model discloses a kind of merge cells meter characteristic field detecting device, belong to the gauge check field in intelligent grid.This equipment comprises tested merge cells (100), TV secondary circuit (200), TA secondary circuit (300), synchronous clock (400) and optical fiber and digital electric energy meter (500); Be provided with merge cells on-site detecting device (600); Tested merge cells (100), TV secondary circuit (200), TA secondary circuit (300), synchronous clock (400) are connected with merge cells on-site detecting device (600) respectively with optical fiber and digital electric energy meter (500).The utility model can not have a power failure emotionally under condition at interval, and the ratio and the angular difference that are combined the sampling of unit detect, thus the error being combined unit control effectively, and guarantee the accurate and effective of measuring system in intelligent substation.

Description

A kind of merge cells meter characteristic field detecting device

Technical field

The utility model belongs to the gauge check field in intelligent grid, particularly relates to a kind of merge cells meter characteristic field detecting device; Specifically, the utility model is the Site Detection of metering (stable state) characteristic of the merge cells of compatible traditional mutual inductor AC sampling, is mainly used in ratio, the angular difference Characteristics Detection of the merge cells differentiating compatible traditional mutual inductor AC sampling.

Background technology

Along with the development of intelligent power grid technology, in first generation digital transformer substation, the reliability of photo-electricity mutual-inductor (ETV/ETA) product is not high, and the shortcoming of fluctuation of service highlights gradually.Therefore, second generation intelligent substation requires that 110kV and above interval adopt traditional mutual inductor to add the pattern of merge cells AC sampling, and the development trend that metering merge cells and protection merge cells separate from equipment is obvious gradually.

In intelligent substation, electric energy metrical system comprises traditional mutual inductor, merge cells, optical fiber communication loop and optical-fiber intelligent ammeter.Wherein, the tradition manufacturing process of mutual inductor, accuracy characterisitics and source tracing method are very ripe, and the fiber optic network of merge cells rear class and optical-fiber intelligent ammeter do not relate to simulating signal sampling element, sampling error can not be produced, therefore, the meter characteristic of merge cells, becomes the bottleneck in the whole metering link in intelligent substation.

At present, the domestic calibrating system being applicable to metering merge cells metering performance is not yet set up at present, particularly for being arranged on scene, in operation, the detection method of merge cells is not yet clear and definite, cause to carry out cycle detection to metering merge cells, effectively cannot control the error that merge cells is introduced, accuracy and the validity of final Electric energy measurement cannot be guaranteed.

Summary of the invention

The purpose of this utility model is the feature run for merge cells in intelligent substation, provides a kind of merge cells meter characteristic field detecting device.

The technical solution adopted in the utility model is as follows:

One, equipment

This equipment comprises working environment---tested merge cells, TV secondary circuit, TA secondary circuit, synchronous clock and data message;

Be provided with merge cells on-site detecting device;

Tested merge cells, TV secondary circuit, TA secondary circuit, synchronous clock are connected with merge cells on-site detecting device respectively with data message;

Described merge cells on-site detecting device comprises collection of simulant signal unit, data processing control units, man-machine interface, synchronization signal unit and message process unit, collection of simulant signal unit, data processing control units are connected successively with man-machine interface, synchronization signal unit is connected with collection of simulant signal unit, and message process unit is connected with data processing control units.

Two, method

First, by the ratio of merge cells field detecting device and angular difference performance are traceable to higher standard, guarantee that its uncertainty of measurement is not more than 1/5 of tested merge cells labeled rating, be at least not more than 1/3 of this labeled rating.Again the three-phase voltage of the tested merge cells of input and three-phase current are accessed merge cells on-site detecting device respectively by mode that is in parallel and series connection; And clock sync signal is input to merge cells on-site detecting device by parallel way; The output signal of tested merge cells is copied or is input to merge cells on-site detecting device by switch screening.

By decoding in merge cells on-site detecting device, by the data convert of tested merge cells.For each voltage and current passage, merge cells on-site detecting device carries out spectrum analysis by the sample data sequence of the sample data sequence and tested merge cells that are combined unit on-site detecting device respectively, obtain the phasor difference of characteristic frequency point, tested merge cells can be obtained at the ratio of this passage and angular difference.

Specifically, this method comprises the following steps:

1. under operation, merge cells on-site detecting device is accessed by mode that is in parallel, series connection in TV, TA loop, synchronizing clock signals is accessed merge cells on-site detecting device;

2. initialization merge cells on-site detecting device;

3. carry out each Air conduct measurement, comprise ratio and angular difference;

4. judge that whether testing result is qualified, be, jump to step 6., otherwise enter step 5.;

5. judge whether sense cycle is maximum sense cycle, is, enters step 6., otherwise jump to step 3. after strengthening sense cycle;

6. Output rusults.

The utility model has following advantages and good effect:

1, the method for voltage parallel access and the access of electric current series winding is utilized, solve when interval does not have a power failure, scene is combined the problem of the voltage signal of unit, the ratio of the sampled value of current signal, the calibration of angular difference, thus realize the periodic calibration being combined the sampled value error performance of unit, guarantee that metering performance is reliable and stable;

2, the method by tested merge cells and merge cells on-site detecting device being compared, is traceable to the national highest standards such as voltage, electric current and time step by step, makes the result of electric energy metrical have legitimacy, validity by tested merge cells.

In a word, the utility model can not have a power failure emotionally under condition at interval, and the ratio and the angular difference that are combined the sampling of unit detect, thus the error being combined unit control effectively, and guarantee the accurate and effective of measuring system in intelligent substation.

Accompanying drawing explanation

Fig. 1 is the block diagram of this equipment;

Fig. 2 is the workflow diagram of this method;

Fig. 3 is the workflow diagram of Air conduct measurement.

In figure:

100-tested merge cells;

200-TV secondary circuit;

300-TA secondary circuit;

400-synchronous clock;

500-optical fiber and digital electric energy meter;

600-merge cells on-site detecting device,

610-collection of simulant signal unit,

611-threephase potential transformer,

612-threephase current transformer,

613-signal processor,

614-AD converter;

620-data processing control units,

621-data processor,

622-controller;

630-man-machine interface;

640-synchronization signal unit;

641-the 1 photoelectric commutator,

642-pulse conditioner;

650-message process unit

651-the 2 photoelectric commutator,

652-packet parsing device.

Embodiment

Describe in detail below in conjunction with drawings and Examples:

One, equipment

1, outfit of equipment

As Fig. 1, this equipment comprises working environment---tested merge cells 100, TV secondary circuit 200, TA secondary circuit 300, synchronous clock 400 and optical fiber and digital electric energy meter 500;

Be provided with merge cells on-site detecting device 600;

Tested merge cells 100, TV secondary circuit 200, TA secondary circuit 300, synchronous clock 400 are connected with merge cells on-site detecting device 600 respectively with optical fiber and digital electric energy meter 500;

Described merge cells on-site detecting device 600 comprises collection of simulant signal unit 610, data processing control units 620, man-machine interface 630, synchronization signal unit 640 and message process unit 650, collection of simulant signal unit 610, data processing control units 620 are connected successively with man-machine interface 630, synchronization signal unit 640 is connected with collection of simulant signal unit 610, and message process unit 650 is connected with data processing control units 620.

2, functions of the equipments block

1, tested merge cells 100

Tested merge cells 100 is working environment of the present utility model, is generally the scene of being arranged on and accesses transformer secondary circuit, and TV and TA signal is converted to IEC61850 message for rear class equipment use.

2, TV secondary circuit 200

TV secondary circuit 200 is working environment of the present utility model, and be generally Y type or D type connection, rated voltage is 57.7V or 100V.

3, TA secondary circuit 300

TV secondary circuit 300 is working environment of the present utility model, and rated current is 1A or 5A.

4, synchronous clock 400

Synchronous clock 400 is working environment of the present utility model, and being the clock sync signal from transformer station's clock source, is Optical Fiber Transmission, is generally IRIG-B form or IEC61588 form.

5, optical fiber and digital electric energy meter 500

Optical fiber and digital electric energy meter 500 receives the data from tested merge cells 100, and the equipment of counting statistics electric flux, data, from Optical Fiber Transmission, meet IEC61850-9 form.

6, merge cells on-site detecting device 600

1) device is overall

Merge cells on-site detecting device 600 comprises collection of simulant signal unit 610, data processing control units 620, man-machine interface 630, synchronizing signal processing unit 640 and message process unit 650.

2) functional part of device

(1) collection of simulant signal unit 610

Collection of simulant signal unit 610 comprises threephase potential transformer 611, threephase current transformer 612, signal processor 613 and AD converter 614;

Threephase potential transformer 611 is connected with AD converter 614 respectively by signal processor 613 with threephase current transformer 612.

Its principle of work is:

Threephase potential transformer 611 and threephase current transformer 612 convert small voltage, the small area analysis signal that can process for signal processor 613 to by from the voltage of TV secondary circuit 200 and TA secondary circuit 300, current signal respectively, through signal processor 613, small voltage and small area analysis signal are carried out signal condition, be the small voltage signal of applicable AD converter 614 by its linear transformation, then convert digital signal to by AD converter 614.

Threephase potential transformer 611, threephase current transformer 612 and signal processor 613 are common function components and parts.

The AD76XX family chip that AD converter 614 can select ADI company to produce; AD76XX family chip is the AD conversion chip of 16bit-18bit, and most high conversion rate can reach 250kSPS, has that accuracy is high, a feature such as stable performance, switching rate are fast and low in energy consumption, can realize the sampling of pin-point accuracy.

(2) data processing control units 620

Data processing control units 620 comprises integrated and the data processor 621 be packaged together and controller 622.

1. data processor 621

Field programmable gate array (FPGA) chip of the Spartan series that data processor 621 selects Xilinx company to produce, the data sequence that the data sequence obtained of being sampled by AD and Message processing obtain carries out processing and computing, obtain ratio and the angular difference data of each passage, and carry out exchanges data with controller.

Spartan Series FPGA chip has that integrated level is high, aboundresources, operation dominant frequency are high, program module aboundresources, rich interface and the feature such as programming is convenient.

2. controller 622

The ATOM Series Industrial computer equipment that controller 622 selects Intel Company to produce, it is embedded in the application software of designed, designed, specifically sees below.

The result that data processor 621 calculates by controller 622 and the work to equipment such as related data and parameter control.

ATOM Series Industrial computer equipment have low in energy consumption, take up room little, rich interface, extensibility are good, graphics performance is good and can install the features such as operating equipment.

(3) man-machine interface 630

Man-machine interface 630 selects touch display screen, can adopt market ripe.

(4) synchronizing signal processing unit 640

Synchronizing signal processing unit 640 comprises front latter linked 1st photoelectric commutator 641 and pulse conditioner 642.

1st photoelectric commutator 641 converts light signal to electric signal, can adopt market ripe.

The synchronization pulse of input is nursed one's health into and can, for the pulse signal of AD conversion time reference, Spartan Series FPGA chip can be used to realize by pulse conditioner 642.

(5) message process unit 650

Message process unit 650 comprises front latter linked 2nd photoelectric commutator 651 and packet parsing device 652.

2nd photoelectric commutator 651 converts light signal to electric signal, can adopt market ripe.

Packet parsing device 652, according to IEC61850-9 agreement, parses data sequence, Spartan Series FPGA chip can be used to realize from the message of input.

3, the detailed annexation of equipment

TV secondary circuit 200, threephase potential transformer 611, signal processor 613 are connected successively with AD converter 614, realize the standard digital amount sequence that the process of voltage signal and analog to digital conversion obtain three-phase voltage signal;

TA secondary circuit 300, threephase current transformer 612, signal processor 613 are connected successively with AD converter 614, realize the standard digital amount sequence that the process of current signal and analog to digital conversion obtain three-phase current signal;

Synchronous clock 400, the 1st photoelectric commutator 641 are connected successively with pulse-modulator 642, obtain synchronous triggering signal; Pulse-modulator 642 is connected with AD converter 614, controls AD converter 614 carry out analog to digital conversion with synchronous triggering signal;

TV secondary circuit 200, TA secondary circuit 300, synchronous clock 400 are connected with tested merge cells 100 respectively, obtain data message;

Tested merge cells 100, the 2nd photoelectric commutator 651 are connected successively with packet parsing device 652, the three-phase voltage obtained and three-phase current measured number amount sequence;

AD converter 614, packet parsing device 652 are connected with data processor 621 respectively, and data processor 621, controller 622 are connected successively with man-machine interface 630, obtain the comparative result of standard digital amount sequence and measured number amount sequence and show.

4, the Cleaning Principle of equipment:

When equipment normally works, the simulating signal that TV secondary circuit 200 and TA secondary circuit 300 export accesses tested merge cells 100, the clock sync signal that full station synchronous clock 400 exports accesses tested merge cells 100, tested merge cells 100 is by sampling and synchronous process, export the data message meeting IEC61850-9 agreement, and these messages are outputted to optical fiber and digital electric energy meter 500, thus on optical fiber and digital electric energy meter 500, measure the electric energy of this critical point generation.

When carrying out field test, under equipment running status, the analog current signal that the analog voltage signal exported by TV secondary circuit 200 respectively and TA secondary circuit 300 export, by the threephase potential transformer 611 in parallel way and series system access merge cells on-site detecting device 600 and threephase current transformer 612, makes the three-phase voltage U of the tested merge cells 100 of input and merge cells on-site detecting device 600 _a, U _b, U _cwith three-phase current I _a, I _b, I _cidentical.Synchronizing signal processing unit 640 in the clock sync signal access merge cells on-site detecting device 600 exported by synchronous clock 400 of entirely standing, makes the tested merge cells of input 100 identical with the synchronous clock of merge cells on-site detecting device 600.After power-up initializing merge cells on-site detecting device 600, can start to detect.

It is t0 that setting detects start time, and sample sequence length is N=2 ⁿ, then the U of tested merge cells 100 output _athe sampled value sequence of passage is classified as UA1, defines as formula (1), wherein UA1 _ibe defined as i-th sampled value in sample sequence.Sample sequence length N=2 ⁿin, the value of n is positive integer, and the error of the larger testing result of value is less, but required detection time is longer, can set maximum sample sequence length according to requiring detection time, to control the time needed for single detection.

UA1＝[UA1 ₀,UA1 ₁,UA1 ₂…UA1 _N-1] (1)

In like manner, definable UB1, UC1 and IA1, IB1, IC1, be respectively the U that tested merge cells 100 exports _b, U _cand I _a, I _b, I _cthe sampled value sequence of phase, by the sampled value two-dimensional sequence X1 of the tested merge cells 100 of these 6 sampled value Sequence composition, definition is as formula (2).

X1＝[UA1；UB1；UC1；IA1；IB1；IC1；] (2)

Same, the sampled value two-dimensional sequence X0 when identical start time t0 and sample sequence length N of definable merge cells on-site detecting device 600, definition is as formula (3)

X0＝[UA0；UB0；UC0；IA0；IB0；IC0；] (3)

Ask for the frequency spectrum of component in each X0 and X1 respectively, obtain amplitude and the phase place of component on signal fundamental frequency (50Hz or 60Hz) frequency, with U _afor example, try to achieve the component on UA1 and UA0 fundamental frequency frequency respectively, can show that the result of this passage ratio and angular difference is as shown in formula (4), wherein a _uA1and a _uA0for the amplitude information of fundamental frequency frequency component, θ _uA1and θ _uA0for the phase information of fundamental frequency frequency component, f and σ is respectively U _athe ratio of passage and angular difference.

$X_{\mathrm{UA}1}\left(f_0\right)=a_{\mathrm{UA}1}\·e^{i\·{\mathrm{\θ}}_{\mathrm{UA}1}}$

$X_{\mathrm{UA}0}\left(f_0\right)=a_{\mathrm{UA}0}\·e^{i\·{\mathrm{\θ}}_{\mathrm{UA}0}}$

(4)

$f_{\mathrm{UA}}=\frac{a_{\mathrm{UA}1}-a_{\mathrm{UA}0}}{a_{\mathrm{UA}0}}$

δ _UA＝θ _UA1-θ _UA0

The ratio of other each passages and angular difference calculate and U _athe computing method of passage are identical.

If testing result does not meet accuracy requirement, n value can be increased as required, sample sequence length N is increased, reduce error by the method increasing data volume.If sample sequence length N has been maximum permissible value, and testing result still not load accuracy requirement, then output detections result.

Two, method

As Fig. 2, this method comprises the following steps:

1. under operation, merge cells on-site detecting device is accessed by mode that is in parallel, series connection in TV, TA loop, synchronizing clock signals is accessed merge cells on-site detecting device-21;

2. initialization merge cells on-site detecting device-22;

3. carry out each Air conduct measurement, comprise ratio and angular difference-23;

4. judge testing result whether qualified-24, be jump to step 6., otherwise enter step 5.;

5. judge whether sense cycle is maximum sense cycle-25, is, enters step 6., otherwise jump to step 3. after strengthening sense cycle-27;

6. Output rusults-26.

As Fig. 3,3. step comprises substep:

A, from sense cycle initial time t0, by U _a, U _b, U _cand I _a, I _b, I _cthe sample data that obtain of totally 6 analog channels form the 2-D data sequence X 0-31 of corresponding 6 passages of standard;

B, simultaneously from sense cycle initial time t0, the output data of tested merge cells are carried out message decoding and data convert, forms tested merge cells U _a, U _b, U _cand I _a, I _b, I _cthe 2-D data sequence X 1-32 of 6 common passages;

C, the data sequence of X1 and X0 is carried out digital signal processing, comprise DC component correction and singular data process-33;

D, ask for the frequency spectrum of X1 and X0 respectively, and try to achieve component f1 and f0 of 50Hz Frequency point, calculate amplitude and the phase place-34 of f1 and f0;

E, calculating U _a, U _b, U _cand I _a, I _b, I _cthe ratio of totally 6 passages and angular difference-35.

Claims (6)

1. a merge cells meter characteristic field detecting device, comprises working environment---tested merge cells (100), TV secondary circuit (200), TA secondary circuit (300), synchronous clock (400) and optical fiber and digital electric energy meter (500);

It is characterized in that:

Be provided with merge cells on-site detecting device (600);

Tested merge cells (100), TV secondary circuit (200), TA secondary circuit (300), synchronous clock (400) are connected with merge cells on-site detecting device (600) respectively with optical fiber and digital electric energy meter (500);

Described merge cells on-site detecting device (600) comprises collection of simulant signal unit (610), data processing control units (620), man-machine interface (630), synchronization signal unit (640) and message process unit (650), collection of simulant signal unit (610), data processing control units (620) are connected successively with man-machine interface (630), synchronization signal unit (640) is connected with collection of simulant signal unit (610), and message process unit (650) is connected with data processing control units (620).

2., by merge cells meter characteristic field detecting device according to claim 1, it is characterized in that:

Described collection of simulant signal unit (610) comprises threephase potential transformer (611), threephase current transformer (612), signal processor (613) and AD converter (614);

Threephase potential transformer (611) is connected with AD converter (614) respectively by signal processor 613 with threephase current transformer (612).

3., by merge cells meter characteristic field detecting device according to claim 1, it is characterized in that:

Described data processing control units (620) comprises integrated and the data processor be packaged together (621) and controller (622).

4., by merge cells meter characteristic field detecting device according to claim 1, it is characterized in that:

Described synchronizing signal processing unit (640) comprises front latter linked 1st photoelectric commutator (641) and pulse conditioner (642).

5., by merge cells meter characteristic field detecting device according to claim 1, it is characterized in that:

Described message process unit (650) comprises front latter linked 2nd photoelectric commutator (651) and packet parsing device (652).

6. by claim 1,2,3,4,5 one of any described merge cells meter characteristic field detecting devices, it is characterized in that:

TV secondary circuit (200), threephase potential transformer (611), signal processor (613) are connected successively with AD converter (614);

TA secondary circuit (300), threephase current transformer (612), signal processor (613) are connected successively with AD converter (614);

Synchronous clock (400), the 1st photoelectric commutator (641) are connected successively with pulse-modulator (642), obtain synchronous triggering signal; Pulse-modulator (642) is connected with AD converter (614);

TV secondary circuit (200), TA secondary circuit (300), synchronous clock (400) are connected with tested merge cells (100) respectively;

Tested merge cells (100), the 2nd photoelectric commutator (651) are connected successively with packet parsing device (652);

AD converter (614), packet parsing device (652) are connected with data processor (621) respectively, and data processor (621), controller (622) are connected successively with man-machine interface (630).