CN102955057A - Electrical measuring device with celibration device and method for measuring electrical current - Google Patents
Electrical measuring device with celibration device and method for measuring electrical current Download PDFInfo
- Publication number
- CN102955057A CN102955057A CN2012102852685A CN201210285268A CN102955057A CN 102955057 A CN102955057 A CN 102955057A CN 2012102852685 A CN2012102852685 A CN 2012102852685A CN 201210285268 A CN201210285268 A CN 201210285268A CN 102955057 A CN102955057 A CN 102955057A
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- CN
- China
- Prior art keywords
- measuring instrument
- measuring
- calibration
- current transformer
- verification
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/22—Tong testers acting as secondary windings of current transformers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The electrical measuring device (4) comprises a connecting unit (10) for connecting a measuring current transformer (6), and a calibration loop (12) for calibration of a measuring unit of the measuring device and connected to the measuring current transformer. The calibration loop is formed as an electrical conductor and comprises the measuring current transformer. The calibration loop is formed as a rigid portion of a measuring device housing (14). The calibration loop is formed as extending or folding portion of the measuring device housing and formed as handle grip. An independent claim is included for a calibration method for calibrating an electrical measuring device.
Description
Technical field
The present invention relates to a kind of electric measurement instrument for measuring electric current, it comprises for the coupling arrangement that connects Verification of Measuring Current Transformer.
The invention still further relates to a kind of electrical measuring device for measuring electric current, it comprises current measuring instrument of the present invention and the Verification of Measuring Current Transformer that is connected on this measuring instrument, the invention still further relates to a kind of calibration steps that the current measuring instrument that is connected with Verification of Measuring Current Transformer is calibrated.
Background technology
The Electrical Measurement System of being measured electric current by being used for of having that hand-held measuring instrument as the releasable Verification of Measuring Current Transformer of sensor forms belongs to known technology.In order to measure, Verification of Measuring Current Transformer is surrounded electric conductor and is derived and the proportional measuring-signal of conductor current by the actual measurement magnetic field of this through-flow conductor.At this, the releasable Verification of Measuring Current Transformer is embodied as measures clamp union one-tenth in the hand-held measuring instrument.Because in this form of implementation of measuring system, measure clamp and measuring instrument truly and form the structural unit that is known as Electricity testing pliers or current clamp, therefore only need to calibrate this current clamp.
In order to be applicable to wide application or special applications, the known measuring system that is formed by the hand-held measuring instrument also, described hand-held measuring instrument has coupling arrangement, in order to connect as external sensor, different Verification of Measuring Current Transformer.Because these sensors can change, and there is manufacturing tolerance in view of sensor of the same type, perhaps in view of can connecting dissimilar sensors according to different purposes, thereby is necessary each sensor is calibrated.In addition, owing to as pollute and the mechanical influence factor of damage, the sensor parameters that causes such as environmental impact factor or the ageing process of temperature and humidity change the accurate calibration that measuring system so also can causing is difficult to obtain long-term stability.Consider that again measurement mechanism self because the parameter that aging, pollution or changes in environmental conditions cause changes, also needs to calibrate again.If yet regularly calibrate, just mean and need to increase input, so people often attempt to obtain higher measuring accuracy take the convertibility of abandoning sensor as cost.Having the aforementioned Electricity testing pliers that fixed set is formed in the measurement clamp in the hand-held measuring instrument is exactly this situation.In order to exempt repeatedly calibration, calibration is confined to supporting sensor generally speaking, but this causes, and produces very large measured deviation in the situation that connects other sensor.Use senior durable type sensor can prevent the variation of sensor parameters time of origin, adopt expensive manufacture method can reduce manufacturing tolerance, can only the sensor in narrow margin tolerance be put on market by screening, can farthest avoid so again calibration.But in general, these measures also can generation time cost and financial cost except meeting causes inaccurate measurement, thereby can only replace limitedly again calibration.
Summary of the invention
In view of this, the objective of the invention is, a kind of current measuring instrument that connects Verification of Measuring Current Transformer is provided, and a kind of the permission by measuring instrument and be connected to measurement mechanism that the Verification of Measuring Current Transformer on this measuring instrument forms and carry out accurate and treat the method for the simple calibration of implementing.
Aspect current measuring instrument, comprise for the electric measurement instrument coupling arrangement that connects Verification of Measuring Current Transformer, that be used for measuring electric current in conjunction with a kind of, this purpose is by being used for by measuring instrument be connected to the calibration ring that measurement mechanism that the Verification of Measuring Current Transformer on this measuring instrument forms calibrates and be achieved, wherein, described calibration ring constitutes electric conductor and can be surrounded by described Verification of Measuring Current Transformer.
Accordingly, measuring instrument of the present invention has calibration ring.This calibration ring constitutes electric conductor, thereby can be applied in the electric current (calibration current) of known dimensions in calibration process.This calibration ring is configured as, so that its Verification of Measuring Current Transformer that can be connected on the measuring instrument is surrounded.For this reason, Verification of Measuring Current Transformer constitute be can divide or calibration ring constitute and can divide, perhaps the two all constitutes and can divide.The calibration current that flows in calibration ring produces the reference signal that can be analyzed in Verification of Measuring Current Transformer, this reference signal transmission is analyzed it to measuring instrument and on measuring instrument.So just can carry out field calibration for the measuring system with different measuring Current Transformer easily, and needn't use optional equipment.The user selects on the spot with the sensor of corresponding working environment optimum matching and also successfully measuring system is calibrated.So just do not need to implement usually long calibration process consuming time with the external calibration instrument.Calibrate this advantage except carrying out (again) to the sensor after changing without any problems, the integrated form calibration ring can also be taken the Temporal changes of sensor parameters into account.Why causa sine qua non is this point, and sensor parameters can be affected by mechanical factor, environmental factor or ageing process and change.
In other favourable embodiments, described calibration ring constitutes part rigidity, protractile or eversible of measuring instrument housing, perhaps constitutes fexible conductor.The characteristics of the calibration ring that consists of rigidly are to have desirable durability in the open air when using, and protractile or eversible embodiment can make the structure of measuring instrument compact especially, and can be as bearing or the support of measuring instrument.In the situation of working environment narrow space, constitute fexible conductor and allow in the fixing situation in measuring instrument position, to make the orientation for place of calibration ring, so that can measured Current Transformer surround all the time.
In all embodiments, this calibration ring can constitute handle/handle aptly, in order to can grip safely, transport this measuring instrument, and where necessary with its hang-up.
For the Verification of Measuring Current Transformer that can cooperate single type is calibrated, described calibration ring constitutes and can divide.For example, the calibration ring that constitutes the part of rigidity is embodied as can be by hinge through, and perhaps flexible calibration ring consists of separably by web member.
According to a kind of preferred implementation, described measuring instrument constitutes the hand-held measuring instrument.This embodiment is especially suitable for use as portable measurement system, and can simplify execute-in-place in the situation of working environment narrow space.
Advantageously, described coupling arrangement constitutes the slotting formula syndeton of the socket connection cable that can connect described Verification of Measuring Current Transformer.Should insert the quick-replaceable that the formula syndeton can realize Verification of Measuring Current Transformer.
Described measuring instrument advantageously has the control module based on microcontroller, and this control module includes storage unit.This embodiment has been realized the flexible configuration of measuring instrument, and calibration process and measuring process are able to implement under software control, can also make software and firmware obtain upgrading.
In addition, this purpose is following to be achieved, and electrical measuring device that be used for to measure electric current has according to measuring instrument of the present invention and is connected to Verification of Measuring Current Transformer on this measuring instrument.Be provided for thus measuring the complete measuring system of electric current.This measurement mechanism of the advantage of measuring instrument of the present invention also all has, and particularly can on-the-spot easily this measurement mechanism be calibrated, and needn't use optional equipment.
Aspect method, be achieved based on purpose of the present invention is following, make in the calibration ring of calibration current from be integrated in described measuring instrument of known dimensions and flow through, described Verification of Measuring Current Transformer is surrounded described calibration ring, the reference signal that generation can be analyzed in described Verification of Measuring Current Transformer is also given described measuring instrument with this reference signal transmission, with this reference signal or the reference value of therefrom deriving out be stored in the storage unit of described measuring instrument, take the reference signal of being stored or the reference value of deriving out from this reference signal of being stored as detecting with reference to carrying out ensuing measured value.
Produce magnetic field in the core of the encirclement calibration ring of the sensor of the electric current with known distribution on being connected to measuring instrument that guides by calibration ring in calibration process, Verification of Measuring Current Transformer is derived proportional measuring-signal and by stube cable this measuring-signal is transferred to measuring instrument according to this magnetic field.With this reference signal or out the reference value of therefrom deriving be stored in the electronic surveying unit of instrument and be used for the measured value that records by this sensor is proofreaied and correct.Therefore, can detect the special characteristics of the survey sensor of corresponding connection by such calibration process, parameter situation of change in the time of can certainly detecting its use for specific sensor, and when measuring with this sensor, the parameter variation that detects is taken into account.
Advantageously, described method provides the possibility that starts calibration process by different modes.Therefore, calibration process can start when recognizing the measured Current Transformer encirclement of calibration ring automatically.In the case, the user does not need to implement other operation steps, and can use by the measuring system of thorough calibration after the calibration process that automatically carries out finishes and carry out work.Calibration process can also be started by executive component by the user.At this, the user starts calibration process by manually inputting.The user also can require to implement calibration process according to measuring instrument, and wherein operational order appears on the display device of measuring instrument.This possibility is for example had a mind to when the first discovery of measuring instrument has the sensor of connection.
In suitable embodiment, described calibration process and measured value detect and carry out under the control of microcontroller.Therefore calibration process and measuring process can according to corresponding calibration condition and measuring condition full automation, perhaps be undertaken by operational order.
Description of drawings
Other favourable enforcement features can obtain from following explanation and accompanying drawing, and it has set forth preferred form of implementation of the present invention.Wherein,
Fig. 1 illustrates the form of implementation of electrical measuring device, and this electrical measuring device comprises measuring instrument of the present invention and the Verification of Measuring Current Transformer that connects and is in calibrating position.
Embodiment
The electrical measuring device 2 that is used for the measurement electric current shown in Figure 1 forms by constituting the electric measurement instrument 4 of the present invention that is used for the measurement electric current of hand-held measuring instrument 4 and the releasable Verification of Measuring Current Transformer 6 that is connected on the hand-held measuring instrument 4.In order to connect the Verification of Measuring Current Transformer 6 with stube cable 8, measuring instrument 4 has the coupling arrangement 10 that constitutes slotting formula syndeton 10.Hand-held measuring instrument 4 has calibration ring 12, and this calibration ring constitutes the part of rigidity arc in the bottom section of measuring instrument housing 14.In the measuring instrument housing 14, form through hole 16 in the inboard of the segmental arc of calibration ring 12, on calibrating position shown in the drawings, releasable Verification of Measuring Current Transformer 6 is passed this through hole.Calibration ring 12 conducts calibration current I in calibration process
Cal, reference signal is detected and be converted in the magnetic field of this calibration current by Verification of Measuring Current Transformer 6, again by stube cable 8 with this reference signal transmission to measuring instrument 4.For this reference signal and the measuring-signal that obtains in measuring process are analyzed, measuring instrument 4 has the control module 18 based on microcontroller, and this control module includes storage unit 20.In addition, measuring instrument 4 also has for example for the executive component 22 of button member or rotary switch form and for the display device 24 that shows measured value and status information.
Claims (16)
1. electric measurement instrument (4) of be used for measuring electric current, comprise for the coupling arrangement (10) that connects Verification of Measuring Current Transformer (6), it is characterized in that for to by described measuring instrument (4) be connected to the calibration ring (12) that measurement mechanism (2) that the described Verification of Measuring Current Transformer (6) on the described measuring instrument forms is calibrated, wherein, described calibration ring (12) constitutes electric conductor and can be surrounded by described Verification of Measuring Current Transformer (6).
2. measuring instrument as claimed in claim 1 is characterized in that, described calibration ring (12) constitutes the part of the rigidity of measuring instrument housing (14).
3. measuring instrument as claimed in claim 1 is characterized in that, described calibration ring (12) constitutes the protractile or eversible part of measuring instrument housing (14).
4. measuring instrument as claimed in claim 1 is characterized in that, described calibration ring (12) constitutes flexible conductor.
5. such as each described measuring instrument in the claim 1 to 4, it is characterized in that described calibration ring (12) constitutes handle/handle.
6. such as each described measuring instrument in the claim 1 to 5, it is characterized in that described calibration ring (12) constitutes and can divide.
7. such as each described measuring instrument in the claim 1 to 6, it is characterized in that described measuring instrument (4) constitutes the hand-held measuring instrument.
8. such as each described measuring instrument in the claim 1 to 7, it is characterized in that described coupling arrangement (10) constitutes the slotting formula syndeton of the socket connection cable (8) that can connect described Verification of Measuring Current Transformer (6).
9. such as each described measuring instrument in the claim 1 to 8, it is characterized in that described measuring instrument (4) has the control module (18) based on microcontroller, described control module includes storage unit (20).
10. such as each described measuring instrument in the claim 1 to 9, it is characterized in that the display device (24) that described measuring instrument (4) has executive component (22) and is used for showing measured value and status information.
11. an electrical measuring device (2) that is used for measuring electric current comprises such as each described measuring instrument (4) in the claim 1 to 10 and the Verification of Measuring Current Transformer (6) on the measuring instrument (4) as described in being connected to.
12. the calibration steps that current measuring instrument (4) is calibrated, described current measuring instrument have the Verification of Measuring Current Transformer (6) that is connected on the described measuring instrument (4), it is characterized in that,
-make in the calibration ring (12) of calibration current from be integrated in described measuring instrument (4) of known dimensions and flow through,
-described Verification of Measuring Current Transformer (6) is surrounded described calibration ring (12),
-generation can be analyzed in described Verification of Measuring Current Transformer (6) reference signal is also given described measuring instrument (4) with described reference signal transmission,
-with described reference signal or the reference value of therefrom deriving out be stored in the storage unit (20) of described measuring instrument (4), and
-take the reference signal of being stored or the reference value of deriving out from described reference signal of being stored as detecting with reference to carrying out ensuing measured value.
13. method as claimed in claim 12 is characterized in that, automatically starts described calibration process when recognizing described calibration ring (12) and surrounded by described Verification of Measuring Current Transformer (6).
14. method as claimed in claim 12 is characterized in that, starts described calibration process by the user by described executive component (22).
15. method as claimed in claim 12 is characterized in that, the user implements described calibration process according to the requirement of described measuring instrument (4), and wherein, operational order appears on the display device (24) of described measuring instrument (4).
16. such as each described method in the claim 12 to 15, it is characterized in that, under the control of microcontroller, carry out described calibration process and measured value and detect.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201110080874 DE102011080874B4 (en) | 2011-08-12 | 2011-08-12 | electrical measuring device, electrical measuring device for measuring electrical currents and calibration methods |
| DE102011080874.4 | 2011-08-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102955057A true CN102955057A (en) | 2013-03-06 |
| CN102955057B CN102955057B (en) | 2015-07-22 |
Family
ID=47595534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210285268.5A Expired - Fee Related CN102955057B (en) | 2011-08-12 | 2012-08-10 | Electrical measuring device with celibration device and method for measuring electrical current |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102955057B (en) |
| DE (1) | DE102011080874B4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730479A (en) * | 2013-12-18 | 2015-06-24 | 比亚迪股份有限公司 | Current sensor detection device and method |
| CN104865548A (en) * | 2015-05-25 | 2015-08-26 | 苏州市华安普电力工程有限公司 | Online current detection ammeter check meter |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924915B (en) * | 2021-01-27 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Mutual calibration system and method for voltage monitors |
| FR3125594B3 (en) * | 2021-07-23 | 2023-09-15 | Totalenergies Renewables | Electrical verification circuit for current clamp, current clamp and corresponding verification method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2681143Y (en) * | 2004-01-07 | 2005-02-23 | 袁剑敏 | Multifunctional digital current measurement clamp meter |
| CN1920580A (en) * | 2005-08-24 | 2007-02-28 | 珠海市科荟电器有限公司 | Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter |
| DE102006011178A1 (en) * | 2006-03-10 | 2007-06-28 | Areva Np Gmbh | Current transformer testing method for use in switchgear and control gear of electrical drive, involves detecting reference measuring variable at measuring output, and examining current transformer based on reference measuring variable |
| WO2009004646A2 (en) * | 2007-05-18 | 2009-01-08 | Rishabh Instruments Private Limited | A novel clamp meter with rotary mechanism for clamp jaws |
| CN201489994U (en) * | 2009-06-09 | 2010-05-26 | 深圳市创银实业有限公司 | Combined precision current transformer |
| CN102033150A (en) * | 2009-09-28 | 2011-04-27 | 福禄克公司 | Digital multimeter including a remote display |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3905060A1 (en) * | 1989-02-18 | 1990-08-23 | Diehl Gmbh & Co | DEVICE FOR CONTACTLESS MEASURING OF A DC |
-
2011
- 2011-08-12 DE DE201110080874 patent/DE102011080874B4/en not_active Expired - Fee Related
-
2012
- 2012-08-10 CN CN201210285268.5A patent/CN102955057B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2681143Y (en) * | 2004-01-07 | 2005-02-23 | 袁剑敏 | Multifunctional digital current measurement clamp meter |
| CN1920580A (en) * | 2005-08-24 | 2007-02-28 | 珠海市科荟电器有限公司 | Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter |
| DE102006011178A1 (en) * | 2006-03-10 | 2007-06-28 | Areva Np Gmbh | Current transformer testing method for use in switchgear and control gear of electrical drive, involves detecting reference measuring variable at measuring output, and examining current transformer based on reference measuring variable |
| WO2009004646A2 (en) * | 2007-05-18 | 2009-01-08 | Rishabh Instruments Private Limited | A novel clamp meter with rotary mechanism for clamp jaws |
| CN201489994U (en) * | 2009-06-09 | 2010-05-26 | 深圳市创银实业有限公司 | Combined precision current transformer |
| CN102033150A (en) * | 2009-09-28 | 2011-04-27 | 福禄克公司 | Digital multimeter including a remote display |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730479A (en) * | 2013-12-18 | 2015-06-24 | 比亚迪股份有限公司 | Current sensor detection device and method |
| CN104865548A (en) * | 2015-05-25 | 2015-08-26 | 苏州市华安普电力工程有限公司 | Online current detection ammeter check meter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011080874A1 (en) | 2013-02-14 |
| DE102011080874B4 (en) | 2015-01-22 |
| CN102955057B (en) | 2015-07-22 |
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Granted publication date: 20150722 |