CN107831352A - A kind of breaker and current measuring method with ribbon core current transformer - Google Patents
A kind of breaker and current measuring method with ribbon core current transformer Download PDFInfo
- Publication number
- CN107831352A CN107831352A CN201710890474.1A CN201710890474A CN107831352A CN 107831352 A CN107831352 A CN 107831352A CN 201710890474 A CN201710890474 A CN 201710890474A CN 107831352 A CN107831352 A CN 107831352A
- Authority
- CN
- China
- Prior art keywords
- current
- breaker
- transformer
- primary
- ribbon core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of breaker with ribbon core current transformer, including body, current transformer and controller, described controller calculates transformer primary electric current, body is controlled to carry out corresponding actions, described breaker also includes memory, the primary current mathematics computing model relevant parameter of transformer is stored in described memory, described mathematics computing model is using secondary current as boundary, it is divided at least two sections, different function expressions is corresponded to respectively, described controller judges its affiliated section according to the measured value of secondary current, and function expression calculates primary current corresponding to using.Compared with prior art; the present invention is by establishing the mathematics computing model inputted with output; the section according to belonging to judging secondary current; accurately to estimate the primary bus current of breaker; so as to safe and reliable protective breaker scene; on the premise of measurement accuracy is ensured, make the cost of transformer reduce by more than 80%.
Description
Technical field
The present invention relates to a kind of circuit breaker electric flow measuring method, more particularly, to a kind of with ribbon core current transformer
Breaker and current measuring method.
Background technology
In electronic type Intelligent plastic hull breaker (abbreviation MCCB) field, generally pass through the Current Mutual Inductance of ribbon core
Device measures the bus current of breaker.Ribbon core current transformer input/output signal is theoretically linear relationship, but this
Magnetic saturation be present in transformer.In magnetic saturation, primary and secondary relation non-linearization, while coil can generate heat, and generate heat
Degree of saturation can be aggravated again, so that output and input constantly fluctuation, are ultimately resulted in by transformer measurement breaker bus
Error can be made to become very big during electric current, or even safeguard protection when production firm can not solve to occur open circuit, so as to cause safety
Problem.To solve the problem, traditional method is the material cost and processing technology for increasing transformer at present, improves the full of transformer
And point, the input and output of effective measurement zone is linearized as far as possible, to solve the precision problem of measurement, but this method increases
The cost of transformer.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind has ribbon core electricity
The breaker and current measuring method of current transformer.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of breaker with ribbon core current transformer, including body, current transformer and controller, described control
Device processed calculates transformer primary electric current, control body carries out corresponding actions, and described breaker also includes memory, and described deposits
In reservoir store transformer primary current mathematics computing model relevant parameter, described mathematics computing model using secondary current as
Boundary, is divided at least two sections, corresponds to different function expressions respectively, and described controller is according to the measured value of secondary current
Judge its affiliated section, and function expression calculates primary current corresponding to use.
A kind of breaker primary current measuring method with ribbon core current transformer, comprises the following steps：
The secondary current of current transformer is read, affiliated mathematics computing model section is judged, according to corresponding to the section
Function expression calculates primary current, and using secondary current as boundary, the parameter of model is stored in described mathematics computing model section
In memory, described memory is integrated in breaker.
Preferably, described mathematics computing model is divided into linear zone and saturation region, correspond to respectively linear function expression formula and
Quadratic function expression formula.
Preferably, the separation in described section is by repeatedly measuring acquisition of averaging.
Preferably, described memory is permanent memory.
Compared with prior art, the present invention has advantages below：
(1) by the saturated characteristic for the current transformer for analyzing ribbon core, input and the mathematics computing model exported are established,
The section according to belonging to judging secondary current, accurately to estimate the primary bus current of breaker, so as to which safe and reliable protection is broken
Road device scene, on the premise of measurement accuracy is ensured, make the cost of transformer reduce by more than 80%.
(2) mathematics computing model relevant parameter is stored in memory, as the intrinsic parameter of transformer, when dispatching from the factory just
Set, current measurement reliability is guaranteed.
(3) separation in section is by repeatedly measuring acquisition of averaging, transformer uniformity when overcoming batch production
The defects of different.
(4) memory is permanent memory, and parameter is not easy to be lost.
Brief description of the drawings
Fig. 1 is the transformer mathematics computing model curve synoptic diagram of the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
A kind of breaker with ribbon core current transformer, including body, current transformer and controller, controller meter
Transformer primary electric current, control body progress corresponding actions are calculated, breaker also includes permanent memory, stored in permanent memory
The primary current mathematics computing model relevant parameter of transformer, mathematics computing model are divided at least two using secondary current as boundary
Section, different function expressions is corresponded to respectively, controller judges its affiliated section according to the measured value of secondary current, and uses
Corresponding function expression calculates primary current.
A kind of breaker primary current measuring method with ribbon core current transformer, comprises the following steps：
The secondary current of current transformer is read, affiliated mathematics computing model section is judged, according to corresponding to the section
Function expression calculates primary current, falls if measuring secondary signal in linear zone, primary current is calculated by linear function；
If measuring time signal in saturation region, primary current is calculated by quadratic function, mathematics computing model section using secondary current as
Boundary, the parameter of model are stored in memory, and memory is integrated in breaker.
Mathematics computing model is divided into linear zone and saturation region, corresponds to linear function expression formula and quadratic function expression respectively
Formula.
During fit mathematics model, it is necessary to accurately determine the separation of linear zone and saturation region, the separation is to measure
Secondary current value is distinguished, and when producing in batches, the uniformity of transformer is different, and the separation is different in characteristic position,
The appropriate position of the mean value computation asked for by repeatedly measuring.Operation coefficient corresponding to mathematical modeling, set by special production
The standby parameter by each transformer in production is man-to-man measure after, specific memory block persistence is arrived in renewal, is needing
During computing, after application program first reads described operation coefficient, and after these coefficients are inserted into data model, by measured
Secondary signal judge selection linear zone or saturation region, calculate accurate primary current.
As shown in Figure 1：
1. abscissa is CT primary input current (A)；Ordinate is that time pole exports (mA)；
2. dotted line is idealized characteristic；
3. solid line is actual transformer characteristic curve.
It is that line line function Y=k*X (wherein Y is secondary current as line line input value, X) is established using dotted line in tradition application,
For the too big place of deviation, certain compensating proportion can be increased.
Such as Fig. 1, P points are the separation of linear zone and saturation region, when the transformer secondary signal measured in conventional method
At P point right areas when (saturation region), measurement accuracy can decline to a great extent, so as to influence the accuracy of protection.
In the present invention, the linear zone on the P points left side, according to linear algorithm calculate corresponding to current value；Saturation on the right of P points
Area, then primary current is calculated with quadratic function.
The mathematical modeling of quadratic function is：
Y=ax2+ bx+c, x are secondary measurement, and y is primary current value；
In actual design, all coefficients (such as a, b, c) in mathematical modeling, when batch transformer in production consistent
In the case that property is relatively good, essentially fixed value, and can be different to the product of different rated current, its coefficient value, but its
Model all follows above-mentioned data model.
Claims (8)
1. a kind of breaker with ribbon core current transformer, including body, current transformer and controller, described control
Device calculates transformer primary electric current, control body carries out corresponding actions,
Characterized in that, described breaker also includes memory, the primary electrical fluxion of transformer is stored in described memory
Computation model relevant parameter is learned, described mathematics computing model is divided at least two sections, corresponded to respectively using secondary current as boundary
Different function expressions, described controller judge its affiliated section according to the measured value of secondary current, and corresponding to use
Function expression calculates primary current.
A kind of 2. breaker with ribbon core current transformer according to claim 1, it is characterised in that described number
Learn computation model and be divided into linear zone and saturation region, correspond to linear function expression formula and quadratic function expression formula respectively.
A kind of 3. breaker with ribbon core current transformer according to claim 2, it is characterised in that described area
Between separation by repeatedly measuring acquisition of averaging.
4. a kind of breaker with ribbon core current transformer according to claim 1, it is characterised in that described deposits
Reservoir is permanent memory.
5. a kind of breaker primary current measuring method with ribbon core current transformer, it is characterised in that including following step
Suddenly：
The secondary current of current transformer is read, affiliated mathematics computing model section is judged, according to function corresponding to the section
Expression formula calculates primary current, and using secondary current as boundary, the parameter of model is stored in storage in described mathematics computing model section
In device, described memory is integrated in breaker.
6. a kind of breaker primary current measuring method with ribbon core current transformer according to claim 5, its
It is characterised by, described mathematics computing model is divided into linear zone and saturation region, corresponds to linear function expression formula and secondary letter respectively
Number expression formula.
7. a kind of breaker primary current measuring method with ribbon core current transformer according to claim 5, its
It is characterised by, the separation in described section is by repeatedly measuring acquisition of averaging.
8. a kind of breaker primary current measuring method with ribbon core current transformer according to claim 5, its
It is characterised by, described memory is permanent memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710890474.1A CN107831352A (en) | 2017-09-27 | 2017-09-27 | A kind of breaker and current measuring method with ribbon core current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710890474.1A CN107831352A (en) | 2017-09-27 | 2017-09-27 | A kind of breaker and current measuring method with ribbon core current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107831352A true CN107831352A (en) | 2018-03-23 |
Family
ID=61643646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710890474.1A Withdrawn CN107831352A (en) | 2017-09-27 | 2017-09-27 | A kind of breaker and current measuring method with ribbon core current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107831352A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841233A (en) * | 2012-09-12 | 2012-12-26 | 同济大学 | Secondary current compensation method for current mutual inductors |
| CN105974349A (en) * | 2016-05-04 | 2016-09-28 | 中国科学院上海应用物理研究所 | Current transformer tracking accuracy measurement method |
-
2017
- 2017-09-27 CN CN201710890474.1A patent/CN107831352A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841233A (en) * | 2012-09-12 | 2012-12-26 | 同济大学 | Secondary current compensation method for current mutual inductors |
| CN105974349A (en) * | 2016-05-04 | 2016-09-28 | 中国科学院上海应用物理研究所 | Current transformer tracking accuracy measurement method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111289942B (en) | Method and system for analyzing error of measurement domain based on single load jump and storage medium | |
| CN103617816B (en) | The measuring method of reactor core power distribution | |
| CN108572343A (en) | Hall current sensor error calibration method | |
| CN104198067B (en) | A kind of winding temperature measuring method for transformator | |
| CN105425174B (en) | A kind of method and device for obtaining core type transformer stray field | |
| CN201757682U (en) | Device used for measuring hot-spot temperature of transformer winding | |
| CN103941079A (en) | On-line monitoring and fault diagnosis system for power distribution network PT | |
| CN105044649B (en) | A kind of current transformer error horizontal dynamic detection method and system | |
| CN115394546B (en) | Offshore wind power test transformer | |
| CN111044956B (en) | Hysteresis loss estimation method | |
| CN108986939A (en) | Method for verifying nuclear reactor power range power coefficient Gk calibration value | |
| CN115267295A (en) | Method and system for determining fluxgate current sensor | |
| CN107294138B (en) | AGC variable load rate real-time calculation and automatic adaptation method | |
| CN115906554A (en) | Finite element simulation-based method and system for guaranteeing accuracy of temperature rise test of transformer | |
| CN107831352A (en) | A kind of breaker and current measuring method with ribbon core current transformer | |
| US20150187478A1 (en) | Magnetic Field Control | |
| CN115308664B (en) | Calibration device and method for Hall current sensor | |
| CN110133348A (en) | A kind of compensation method, system and the storage medium of electric energy meter self-heating error | |
| CN106405287A (en) | Dominant harmonic wave source tracking method suitable for daily electric energy quality monitoring system application | |
| CN110031079A (en) | A kind of belted electronic balance online calibration method | |
| CN203117414U (en) | Alternating-current large-current checking system of current transformer | |
| CN102077059A (en) | Method for thermally compensating gaging device and thermally compensated gaging station | |
| CN103713267A (en) | Continuous iron-loss measurement wire frame for electrical steel | |
| CN109991493B (en) | Electric energy monitoring method, device, equipment and system | |
| CN113589212B (en) | Method for determining saturation point of current transformer based on maximum offset method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180323 |