CN113030837A - Full-range current output module and method based on electric energy meter calibrating device - Google Patents
Full-range current output module and method based on electric energy meter calibrating device Download PDFInfo
- Publication number
- CN113030837A CN113030837A CN202110240652.2A CN202110240652A CN113030837A CN 113030837 A CN113030837 A CN 113030837A CN 202110240652 A CN202110240652 A CN 202110240652A CN 113030837 A CN113030837 A CN 113030837A
- Authority
- CN
- China
- Prior art keywords
- current
- current transformer
- electric energy
- energy meter
- pole double
- 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- Withdrawn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
Images
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
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a full-range current output module and a full-range current output method based on an electric energy meter calibrating device, wherein based on the existing range of the electric energy meter calibrating device being 0.1-100A current transformer, a secondary 5A current gear is connected with the current output end of the electric energy meter calibrating device at one end through a single-pole double-throw relay, and the other end is connected with a primary current input of a 0A-5 mA current transformer CT2, and the zero magnetic flux compensation technology is applied to ensure that the primary and secondary current ratio of the 0A-5 mA current transformer CT2 can be accurately converted according to the coil turns ratio thereof, thereby realizing the stable output of 5 mA-100A full-range current. Therefore, the low distortion degree and the high accuracy of the current transformer 5 mA-100A full-range current output can be ensured, the cost is saved, and the structural compatibility is strong.
Description
Technical Field
The invention relates to the field of current transformers, in particular to a full-range current output module and a full-range current output method based on an electric energy meter calibrating device.
Background
The current transformer is widely applied to various fields of the power industry, and particularly for an electric energy meter calibrating device, the high-precision full-range current transformer is very important. The new standard intelligent electric energy meter based on the IR46 puts higher requirements on high-precision full-range current, and needs a smaller range (such as 5mA) for detection calibration.
The range of a current transformer adopted by a power source of the conventional electric energy meter calibrating device is usually within the range of 0.1-100A, when 5mA low current is needed, the power source of the electric energy meter calibrating device can switch a current gear to a 0.1A current gear to output 5mA current, and because the turn ratio of a primary stage to a secondary stage is too large, the primary current is too small, the interference caused by board-level noise is large, and the distortion degree and the accuracy of the current cannot be ensured.
The existing electric energy meter calibrating device 5mA current output scheme is usually realized by directly winding a 5mA current gear on a magnetic core of a current transformer. Because the number of winding turns of the small current gear is too large, the winding cannot be carried out on the magnetic core of the current transformer with the existing measuring range of 0.1-100A, and the magnetic core with larger size needs to be selected for winding. Therefore, the body type of the current transformer with the measuring range of 5 mA-100A is overlarge, and the current transformer is not easy to be compatible with the existing structure.
Disclosure of Invention
The invention provides a full-range current output method based on an electric energy meter calibrating device, aiming at the problem of small-range current gears of a current transformer of the existing electric energy meter calibrating device. The current transformer is applied to the electric energy meter calibrating device and is used for realizing the stable output of the full-range current of the power source.
In order to achieve the purpose, the invention provides a full-range current output module based on an electric energy meter calibrating device, which comprises a 0.1A-100A current transformer CT1, a 0A-5 mA current transformer CT2, a zero-flux current transformer CT3 for feedback and metering, relays K1, K2, K3, K4, K5, K6, K7, K8, K9, K10 and K11, wherein:
the current transformer CT1 with the range of 0.1A-100A is used for receiving the output current of the power source of the electric energy meter calibrating device and outputting the current of 0.1A-100A according to the requirement;
the 0A-5 mA current transformer CT2 has a measuring range of 0A-5 mA, and outputs 0A-5 mA current with low distortion and high accuracy by applying zero magnetic flux compensation technology;
the zero-flux current transformer CT3 for feedback and measurement is used for power source current outer loop feedback and standard meter measurement of the electric energy meter calibrating device;
the single-pole double-throw relays K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10 are respectively connected with the output ends of the 0.1A-100A current transformers CT1 and used for conducting and disconnecting the output current of the 0.1A-100A current transformers CT 1;
a double-pole double-throw relay K11 for switching 5A and 5mA current output;
the output end of a current transformer CT1 of 0.1A-100A is respectively connected with a single-pole double-throw relay K1, a single-pole double-throw relay K2, a single-pole double-throw relay K3, a single-pole double-throw relay K4, a single-pole double-throw relay K5, a single-pole double-throw relay K6, a single-pole double-throw relay K7, a single-pole double-throw relay K8, a single-pole double-throw relay K11, the input end 1 of the double-pole double-throw relay K11 is connected with a common end of a 5A winding of a zero-flux current transformer CT3 for feedback and.
A full-range current output method based on an electric energy meter calibrating device is characterized in that a current transformer CT1 with the range of 0.1A-100A, a current transformer CT2 with the range of 0A-5 mA and a zero-flux current transformer CT3 for feedback and metering in the electric energy meter calibrating device are utilized to provide accurate and stable 5 mA-100A full-range current for calibrating and checking the electric energy meter, and the specific flow is as follows:
step 1: setting specific current parameters through upper computer software of the electric energy meter calibrating device;
step 2: the electric energy meter calibrating device judges whether the current parameter is less than or equal to 0.5mA through the main control module according to the specific current parameter, if the current parameter is less than or equal to 0.5mA, the step 3 is carried out, and if the current parameter is more than 0.5A and less than or equal to 100A, the step 6 is carried out;
and step 3: the electric energy meter calibrating device is conducted through a main control module single-pole double-throw relay K6, and a 0.1A-100A current transformer CT1 outputs 5A current to a zero-flux current transformer CT3 for feedback and metering;
and 4, step 4: the common end of a 5A winding of the zero-flux current transformer CT3 for feedback and metering provides primary current input for a 0A-5 mA current transformer CT2 through a double-pole double-throw relay K11;
and 5: the 0A-5 mA current transformer CT2 provides 0A-5 mA current for the electric energy meter calibrating device;
step 6: the electric energy meter calibrating device judges the gear corresponding to the current parameter through the main control module and controls the single-pole double-throw relay corresponding to the gear to be switched on;
and 7: the current output by the 0.1A-100A current transformer CT1 flows through a control single-pole double-throw relay corresponding to a current gear and is output to the zero-flux current transformer CT3 for feedback and measurement, the zero-flux current transformer CT3 is used for measuring the output current value of the CT1 and feeding back the current output by the 0.1A-100A current transformer CT1, and the stability of the current value is guaranteed;
and 8: the output current of the CT1 passes through a zero-flux current transformer CT3 for feedback and metering and then provides current output for a calibrating device of the electric energy meter.
The invention has the beneficial effects that:
1. the current with the measuring range of 5 mA-100A can be output through the combination of the current transformer CT1 of 0.1A-100A, the current transformer CT2 of 0A-5 mA and the zero-flux current transformer CT3 for feedback and measurement;
2. the current is fed back by the zero-flux current transformer CT3 for feedback and measurement, so the current distortion degree is low and the accuracy is high.
Drawings
Fig. 1 is a diagram of an embodiment of a full-scale current output method based on an electric energy meter calibrating device according to the invention.
FIG. 2 shows a current transformer with a current output range of 0.1A-100A.
Fig. 3 shows a zero-flux current transformer with a current output range of 5mA according to the present invention.
Fig. 4 shows a zero flux current transformer for feedback and metering according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a full-range current output module based on an electric energy meter calibrating apparatus includes a 0.1A-100A current transformer CT1 shown in fig. 2, a 0A-5 mA current transformer CT2 shown in fig. 3, a zero-flux current transformer CT3 for feedback and metering shown in fig. 4, relays K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, and K11, wherein:
the current transformer CT1 with the range of 0.1A-100A is used for receiving the output current of the power source of the electric energy meter calibrating device and outputting the current of 0.1A-100A according to the requirement;
the 0A-5 mA current transformer CT2 has a measuring range of 0A-5 mA, and outputs 0A-5 mA current with low distortion and high accuracy by applying zero magnetic flux compensation technology;
the zero-flux current transformer CT3 for feedback and measurement is used for power source current outer loop feedback and standard meter measurement of the electric energy meter calibrating device;
the single-pole double-throw relays K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10 are respectively connected with the output ends of the 0.1A-100A current transformers CT1 and used for conducting and disconnecting the output current of the 0.1A-100A current transformers CT 1;
a double-pole double-throw relay K11 for switching 5A and 5mA current output;
the output end of a current transformer CT1 of 0.1A-100A is respectively connected with a single-pole double-throw relay K1, a single-pole double-throw relay K2, a single-pole double-throw relay K3, a single-pole double-throw relay K4, a single-pole double-throw relay K5, a single-pole double-throw relay K6, a single-pole double-throw relay K7, a single-pole double-throw relay K8, a single-pole double-throw relay K11, the input end 1 of the double-pole double-throw relay K11 is connected with a common end of a 5A winding of a zero-flux current transformer CT3 for feedback and.
A full-range current output method based on an electric energy meter calibrating device is characterized in that after a secondary 5A current gear of a 0.1A-100A current transformer CT1 corresponds to a 5A winding through a zero flux current transformer CT3 for feedback and metering, the output of a homonymy end (COM end) corresponding to the 5A winding of the zero flux current transformer CT3 for feedback and metering is connected with the 1 pin input of a small-range current switching relay K11, the 2 pin of the relay K11 is connected with the IOUT high-end output of a power source of the electric energy meter calibrating device, the 3 pin of the relay K11 is connected with the primary current input of a 0A-5 mA current CT2 with a small-range zero range of 5mA, the high-end output (5mA) of the 0A-5 mA current transformer CT2 is connected with the 4 pin input of the small-range current switching relay K11, the 6 pin of the relay K11 is connected with the UT high-end output of the power source of the electric energy meter calibrating device, the primary homonymy end (COM end) of the 0.1A-100A current transformer CT2 is connected with the secondary COM end (COM end And ensuring that the same-name ends (COM ends) of the CT1 and the CT2 used for the 0.1A-100A current transformer are the same.
When the electric energy meter calibrating device generates currents under different working conditions, the switching control mode of the current transformer is as follows:
1. when the electric energy meter calibrating device needs to generate 0.1-5A current, the upper computer of the electric energy meter calibrating device controls corresponding current gear switching relays (K1, K2, K3, K4, K5 and K6) to be closed, and the small-range current switching relay K11 is disconnected (K11-1 is connected with K11-2, and K11-4 is connected with K11-5).
2. When the electric energy meter calibrating device needs to generate 5-100A current, the upper computer of the electric energy meter calibrating device controls corresponding current gear switching relays (K7, K8, K9 and K10) to be closed, and the small-range current switching relay K11 is disconnected (K11-1 is connected with K11-2, and K11-4 is connected with K11-5).
3. When the electric energy meter calibrating device needs to generate current within 5mA, the upper computer of the electric energy meter calibrating device controls the corresponding current gear switching relay K6 to be closed, and the small-range current switching relay K11 is closed and opened (K11-1 is connected with K11-3, and K11-4 is connected with K11-6). At the moment, the 0A-5 mA current transformer CT2 is combined with a zero magnetic flux compensation circuit to compensate the magnetic flux loss caused by an iron core and a wire harness, so that the primary and secondary current ratios of the small-range current transformer and the primary and secondary turn ratios are in inverse proportion as accurately as possible, and the condition that the output current and the metering current are not in linear proportion and further the basic error is out of tolerance during meter checking is avoided.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A full-range current output module based on an electric energy meter calibrating device comprises a 0.1A-100A current transformer CT1, a 0A-5 mA current transformer CT2, a zero-flux current transformer CT3 for feedback and metering, relays K1, K2, K3, K4, K5, K6, K7, K8, K9, K10 and K11, and is characterized in that:
the current transformer CT1 with the range of 0.1A-100A is used for receiving the output current of the power source of the electric energy meter calibrating device and outputting the current of 0.1A-100A according to the requirement;
the 0A-5 mA current transformer CT2 has a measuring range of 0A-5 mA, and outputs 0A-5 mA current with low distortion and high accuracy by applying zero magnetic flux compensation technology;
the zero-flux current transformer CT3 for feedback and measurement is used for power source current outer loop feedback and standard meter measurement of the electric energy meter calibrating device;
the single-pole double-throw relays K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10 are respectively connected with the output ends of the 0.1A-100A current transformers CT1 and used for conducting and disconnecting the output current of the 0.1A-100A current transformers CT 1;
a double-pole double-throw relay K11 for switching 5A and 5mA current output;
the output end of a current transformer CT1 of 0.1A-100A is respectively connected with a single-pole double-throw relay K1, a single-pole double-throw relay K2, a single-pole double-throw relay K3, a single-pole double-throw relay K4, a single-pole double-throw relay K5, a single-pole double-throw relay K6, a single-pole double-throw relay K7, a single-pole double-throw relay K8, a single-pole double-throw relay K11, the input end 1 of the double-pole double-throw relay K11 is connected with a common end of a 5A winding of a zero-flux current transformer CT3 for feedback and.
2. A full-range current output method based on an electric energy meter calibrating device is characterized in that a current transformer CT1 with the range of 0.1A-100A, a current transformer CT2 with the range of 0A-5 mA and a zero-flux current transformer CT3 for feedback and metering in the electric energy meter calibrating device are utilized to provide accurate and stable 5 mA-100A full-range current for calibrating and checking the electric energy meter, and the specific flow is as follows:
step 1: setting specific current parameters through upper computer software of the electric energy meter calibrating device;
step 2: the electric energy meter calibrating device judges whether the current parameter is less than or equal to 0.5mA through the main control module according to the specific current parameter, if the current parameter is less than or equal to 0.5mA, the step 3 is carried out, and if the current parameter is more than 0.5A and less than or equal to 100A, the step 6 is carried out;
and step 3: the electric energy meter calibrating device is conducted through a main control module single-pole double-throw relay K6, and a 0.1A-100A current transformer CT1 outputs 5A current to a zero-flux current transformer CT3 for feedback and metering;
and 4, step 4: the common end of a 5A winding of the zero-flux current transformer CT3 for feedback and metering provides primary current input for a 0A-5 mA current transformer CT2 through a double-pole double-throw relay K11;
and 5: the 0A-5 mA current transformer CT2 provides 0A-5 mA current for the electric energy meter calibrating device;
step 6: the electric energy meter calibrating device judges the gear corresponding to the current parameter through the main control module and controls the single-pole double-throw relay corresponding to the gear to be switched on;
and 7: the current output by the 0.1A-100A current transformer CT1 flows through a control single-pole double-throw relay corresponding to a current gear and is output to the zero-flux current transformer CT3 for feedback and measurement, the zero-flux current transformer CT3 is used for measuring the output current value of the CT1 and feeding back the current output by the 0.1A-100A current transformer CT1, and the stability of the current value is guaranteed;
and 8: the output current of the CT1 passes through a zero-flux current transformer CT3 for feedback and metering and then provides current output for a calibrating device of the electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240652.2A CN113030837A (en) | 2021-03-04 | 2021-03-04 | Full-range current output module and method based on electric energy meter calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240652.2A CN113030837A (en) | 2021-03-04 | 2021-03-04 | Full-range current output module and method based on electric energy meter calibrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113030837A true CN113030837A (en) | 2021-06-25 |
Family
ID=76467862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110240652.2A Withdrawn CN113030837A (en) | 2021-03-04 | 2021-03-04 | Full-range current output module and method based on electric energy meter calibrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113030837A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430069A (en) * | 2002-12-31 | 2003-07-16 | 武汉华电国电高压科技发展有限公司 | Method and device for testing current ratio staudard high-correctness current transformer |
| CN201859213U (en) * | 2010-11-11 | 2011-06-08 | 陕西电力科学研究院 | Intelligent energy meter verifying device |
| CN103995165A (en) * | 2014-06-04 | 2014-08-20 | 国网河南省电力公司南阳供电公司 | Automatic adjusting device and adjusting method for multi-transformation ratio current transformer |
| CN105301551A (en) * | 2015-10-29 | 2016-02-03 | 国网上海市电力公司 | Watt-hour meter calibration device and method outputting current under 1mA |
| CN105607031A (en) * | 2016-03-23 | 2016-05-25 | 国网四川省电力公司电力科学研究院 | High-voltage electric energy meter calibrating device |
| CN107359800A (en) * | 2017-08-07 | 2017-11-17 | 国家电网公司 | A kind of multrirange power pack and compensation method based on Zero flux compensation |
| CN110531153A (en) * | 2019-09-26 | 2019-12-03 | 浙江涵普电力科技有限公司 | A kind of high accuracy three-phase standard electric energy meter with harmonic measure |
-
2021
- 2021-03-04 CN CN202110240652.2A patent/CN113030837A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430069A (en) * | 2002-12-31 | 2003-07-16 | 武汉华电国电高压科技发展有限公司 | Method and device for testing current ratio staudard high-correctness current transformer |
| CN201859213U (en) * | 2010-11-11 | 2011-06-08 | 陕西电力科学研究院 | Intelligent energy meter verifying device |
| CN103995165A (en) * | 2014-06-04 | 2014-08-20 | 国网河南省电力公司南阳供电公司 | Automatic adjusting device and adjusting method for multi-transformation ratio current transformer |
| CN105301551A (en) * | 2015-10-29 | 2016-02-03 | 国网上海市电力公司 | Watt-hour meter calibration device and method outputting current under 1mA |
| CN105607031A (en) * | 2016-03-23 | 2016-05-25 | 国网四川省电力公司电力科学研究院 | High-voltage electric energy meter calibrating device |
| CN107359800A (en) * | 2017-08-07 | 2017-11-17 | 国家电网公司 | A kind of multrirange power pack and compensation method based on Zero flux compensation |
| CN110531153A (en) * | 2019-09-26 | 2019-12-03 | 浙江涵普电力科技有限公司 | A kind of high accuracy three-phase standard electric energy meter with harmonic measure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103592490B (en) | A kind of high accuracy electronic compensation type current transformer | |
| CN105372613B (en) | Detecting current transformer automatic zero set zero-detection device and method based on current comparator | |
| CN104569897A (en) | Standard Rogowski coil-based electronic current transformer calibration system | |
| CN109507459A (en) | Standard electric signal creating method, device and accuracy checking method of one or two fusion switchgears and system | |
| CN102818927A (en) | Measuring device and measuring method of reverse small current in direct current distribution system | |
| CN108845286B (en) | Simultaneous calibration device for two current loops of single-phase electric energy meter | |
| CN103928226A (en) | Error compensation single-core three-winding current transformer and split core type current transformer | |
| CN110118885A (en) | Electrical energy measurement test connecting box, target meter replacing options and electric energy metering device | |
| CN110501570A (en) | Device for measurement of electrical energy and its current measurement mechanism | |
| CN113341218B (en) | Direct current electric energy meter with self-adaptive regulation of measuring range and control method thereof | |
| CN204405824U (en) | Based on the electronic current mutual inductor check system of standard Luo-coil | |
| CN113030837A (en) | Full-range current output module and method based on electric energy meter calibrating device | |
| CN107066010B (en) | Quadrature field regulator and pressure regulation method | |
| CN205263293U (en) | Zero device is examined to current transformer examination autozero based on current comparison appearance | |
| CN203606413U (en) | High-accuracy electronic compensation type current transformer | |
| CN115356676A (en) | Phase line and zero line synchronous calibration method for single-phase ammeter | |
| CN115469139B (en) | Current measuring device and method | |
| CN104849532A (en) | Precise current sensor | |
| CN2150619Y (en) | Current transformer electronic compensator | |
| RU2329514C1 (en) | Alternating current measurening tool | |
| CN103487705A (en) | Quality control method for excitation characteristics of C-type iron core voltage transformer | |
| CN111856192A (en) | No load check out test set | |
| CN104569896A (en) | Digital signal configuration method of acquisition unit of electronic current transformer | |
| CN110907729A (en) | Power equipment testing method based on active compensation mutual inductor and three-phase source | |
| CN214585940U (en) | High-precision test equipment for current transformer |
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 |
Application publication date: 20210625 |
|
| WW01 | Invention patent application withdrawn after publication |