CN216526259U - Full-automatic calibrating device of standard current transformer - Google Patents
Full-automatic calibrating device of standard current transformer Download PDFInfo
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- CN216526259U CN216526259U CN202121047994.4U CN202121047994U CN216526259U CN 216526259 U CN216526259 U CN 216526259U CN 202121047994 U CN202121047994 U CN 202121047994U CN 216526259 U CN216526259 U CN 216526259U
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Abstract
A full-automatic calibrating device for a standard current transformer relates to the technical field of measurement of electric instruments and meters, and comprises an automatic switching device for the standard current transformer, a top-speed transformer calibrator, a full-automatic current transformer load box and an upper computer; the measured standard current transformer is respectively and electrically connected with the automatic switching device of the standard current transformer and the full-automatic current transformer load box; the standard mutual inductor automatic switching device is electrically connected with the top-speed mutual inductor calibrator; the top-speed mutual inductor calibrator is electrically connected with the upper computer. The utility model has the beneficial effects that: all wiring terminals of the standard current transformer to be measured are connected into the automatic switching device of the standard current transformer at one time, error checking of all transformation ratios of the standard current transformer to be measured is achieved automatically through the automatic switching device of the standard current transformer and an upper computer, conventional workload is greatly reduced, work efficiency is improved, and a large amount of repetitive wiring work is reduced.
Description
Technical Field
The utility model relates to the technical field of measurement of electric instruments and meters, in particular to a full-automatic calibrating device for a standard current transformer.
Background
The standard current transformer is an important standard instrument for verifying the current transformer for metering as a standard transformer, and can verify the current transformer which is lower than the standard transformer by two or more levels. According to the requirements of 'JJG 313-2010 current transformer for measurement', a newly purchased precise current transformer needs to be verified, the precise current transformer can be used after being qualified, and meanwhile, the transformer in the period of 2 years for verification needs to be verified. In order to ensure the accuracy and reliability of the electric energy metering instrument and equipment, a higher quality technology supervision department must verify the standard appliances of the power supply area administered every other verification period so as to trace the measurement value of the metering standard.
The accuracy of the standard current transformer used by a general inspection client is 0.05 grade to 0.01S grade, the transformation ratio of one standard current transformer is at least dozens, and more than six and seventy. In the verification process, workers need to manually re-wire the primary winding and the secondary winding of the tested mutual inductor and the standard mutual inductor every time 1 transformation ratio is verified, so that the working efficiency is low. The test of all transformation ratios of 1 standard current transformer needs 1-2 days, and the phenomenon of rework caused by wrong connection of the transformation ratios can also exist. The traditional standard current transformer calibrating device has the problems of complex wiring, difficult operation and the like.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides a full-automatic measurement and calibration device for a standard current transformer, which has high automation degree, can finish the calibration of all the transformation ratios of the standard current transformer at one time, reduces the workload of staff in a metrological calibration department, and can improve the working efficiency and reduce the cost.
The utility model provides a full-automatic calibrating installation of standard current transformer, specifically includes: the system comprises a standard current transformer automatic switching device, a top-speed transformer calibrator and an upper computer; the measured standard current transformer is electrically connected with the automatic switching device of the standard current transformer; the standard mutual inductor automatic switching device is electrically connected with the top-speed mutual inductor calibrator; the top-speed mutual inductor calibrator is electrically connected with the upper computer.
The tested standard current transformer and the standard current transformer automatic switching device are only connected once, and the upper computer, the overspeed transformer calibrator and the standard current transformer automatic switching device automatically complete error verification of all transformation ratios of the tested standard current transformer.
The standard current transformer to be detected has the following specification parameters: 0.05-0.01S grade, primary current 5A-2000A, secondary current 5A or 1A.
The top-speed mutual inductor calibrator comprises 4 wiring terminals which are TX, T0, K and D respectively; the TX end represents a signal end of a current transformer to be detected; the terminal T0 represents a signal terminal of a standard current transformer; the K end represents a difference signal end; the D terminal represents a ground terminal.
The automatic switching device of the standard current transformer also comprises a two-stage precise current transformer with a current booster;
the two-stage precise current transformer with the current booster consists of a first-stage auxiliary current transformer and a second-stage main current transformer; the primary winding N1, the secondary winding N2 and the iron core T1 form a first-stage transformer, and the secondary windings N1, N2, the secondary compensation winding NB and the iron core T2 form a second-stage transformer;
the terminal buttons of the primary winding of the double-stage precision current transformer with the current booster are L1-L8, the terminal buttons are middle taps, L1 is a primary winding polar end, and L2-L8 are primary winding nonpolar ends;
the primary compensation winding of the double-stage precise current transformer with the current booster corresponds to L1-L8, and the terminal buttons are b1-b 8 and are used for indirect grounding; b1 is connected with a primary polarity end L1 in advance; b 2-b 8 are grounded;
the secondary winding terminal button of the double-stage precise current transformer with the current booster is K1-K13, is of a middle tap type and is disconnected at a K11 position;
the secondary compensation winding of the double-stage precise current transformer with the current booster corresponds to the secondary winding, the terminal button of the secondary compensation winding is B1-B13, and the secondary compensation winding is disconnected at the B11 position.
The specific connection relationship between the standard current transformer automatic switching device and the measured standard current transformer as well as the overspeed transformer calibrator is as follows:
primary winding end buttons L1-LX of the standard current transformer are respectively and correspondingly electrically connected with end buttons L1-LX on the primary winding switching side of the automatic switching device of the standard current transformer;
the secondary winding terminal buttons K, K1-Kn of the standard current transformer are respectively electrically connected with the terminal buttons K, K1-Kn at the switching side of the secondary winding of the automatic switching device of the standard current transformer in a one-to-one correspondence manner; a terminal K1-Kn at the switching side of a secondary winding of the automatic switching device of the standard current transformer is connected to the TX end of the check meter of the top-speed transformer together through a corresponding switch;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to a first-stage current transformer L1-L8 of the two-stage precise current transformer with the current booster; a primary winding terminal button L of the standard current transformer is connected to the L corresponding to the primary winding terminal button of the two-stage precise current transformer with the current booster through a change-over switch of the automatic change-over device of the standard current transformer;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to the secondary winding end buttons K1-K13 of the two-stage precise current transformer with the current booster; a terminal K at the switching side of the secondary winding of the automatic switching device of the standard current transformer is connected to the B end of the secondary compensation winding of the two-stage precise current transformer with the current booster through a switch of the automatic switching device of the standard current transformer;
terminal buttons L1-L8 of the primary winding of the double-stage precision current transformer with the current booster are connected to the standard primary compensation ground through corresponding change-over switches; and the second secondary compensation winding terminal buttons B1-B13 of the two-stage precision current transformer with the current booster are connected to the standard secondary compensation ground through corresponding change-over switches.
The full-automatic calibrating device for the standard current transformer further comprises a program-controlled voltage regulating device and a full-automatic current load box; the program-controlled voltage regulating device and the full-automatic current load box are respectively electrically connected with the standard current transformer to be measured and the overspeed transformer calibrator.
The utility model has the beneficial effects that: the full-automatic measurement and calibration device for the standard current transformer can realize full-automatic calibration of a labeled current transformer with the transformation ratio of 1A-5000A/(1A, 5A), and practice proves that the device can reduce repeated labor, reduce working intensity, improve working efficiency, greatly reduce conventional workload, reduce a large amount of repetitive wiring work and facilitate the development of current transformer calibration traceability work in a laboratory.
Drawings
FIG. 1 is a connection diagram of a full-automatic calibrating apparatus for a standard current transformer according to the present invention;
FIG. 2 is a wiring diagram of a two-stage precision current transformer with a current booster according to the present invention;
fig. 3 is a wiring diagram of the automatic switching device of the standard current transformer of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a full-automatic calibrating apparatus for a standard current transformer, which specifically includes:
the system comprises a standard current transformer automatic switching device, a top-speed transformer calibrator and an upper computer; the measured standard current transformer is electrically connected with the automatic switching device of the standard current transformer; the standard mutual inductor automatic switching device is electrically connected with the top-speed mutual inductor calibrator; the top-speed mutual inductor calibrator is electrically connected with the upper computer;
the tested standard current transformer and the standard current transformer automatic switching device are only connected once, and the upper computer, the overspeed transformer calibrator and the standard current transformer automatic switching device automatically complete error verification of all transformation ratios of the tested standard current transformer.
The standard current transformer to be detected has the following specification parameters: 0.05-0.01S grade, primary current 5A-2000A, secondary current 5A or 1A.
The top-speed mutual inductor calibrator comprises 4 wiring terminals which are TX, T0, K and D respectively; the TX end represents a signal end of a current transformer to be detected; the terminal T0 represents a signal terminal of a standard current transformer; the K end represents a difference signal end; the D terminal represents a ground terminal.
Referring to fig. 2, the automatic switching device of the standard current transformer further includes a two-stage precision current transformer with a current booster;
the two-stage precise current transformer with the current booster consists of a first-stage auxiliary current transformer and a second-stage main current transformer; the primary winding N1, the secondary winding N2 and the iron core T1 form a first-stage transformer, and the secondary windings N1, N2, the secondary compensation winding NB and the iron core T2 form a second-stage transformer;
the terminal buttons of the primary winding of the double-stage precision current transformer with the current booster are L1-L8, the terminal buttons are middle taps, L1 is a primary winding polar end, and L2-L8 are primary winding nonpolar ends;
the primary compensation winding of the double-stage precise current transformer with the current booster corresponds to L1-L8, and the terminal buttons are b1-b 8 and are used for indirect grounding; b1 is connected with a primary polarity end L1 in advance; b 2-b 8 are grounded;
the secondary winding terminal button of the double-stage precise current transformer with the current booster is K1-K13, is of a middle tap type and is disconnected at a K11 position;
the secondary compensation winding of the double-stage precise current transformer with the current booster corresponds to the secondary winding, the terminal button of the secondary compensation winding is B1-B13, and the secondary compensation winding is disconnected at the B11 position.
Referring to fig. 3, the specific connection relationship between the standard current transformer automatic switching device and the measured standard current transformer and the overspeed transformer calibrator is as follows:
primary winding end buttons L1-LX of the standard current transformer are respectively and correspondingly electrically connected with end buttons L1-LX on the primary winding switching side of the automatic switching device of the standard current transformer;
the secondary winding terminal buttons K, K1-Kn of the standard current transformer are respectively electrically connected with the terminal buttons K, K1-Kn at the switching side of the secondary winding of the automatic switching device of the standard current transformer in a one-to-one correspondence manner; a terminal K1-Kn at the switching side of a secondary winding of the automatic switching device of the standard current transformer is connected to the TX end of the check meter of the top-speed transformer together through a corresponding switch;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to a first-stage current transformer L1-L8 of the two-stage precise current transformer with the current booster; a primary winding terminal button L of the standard current transformer is connected to the L corresponding to the primary winding terminal button of the two-stage precise current transformer with the current booster through a change-over switch of the automatic change-over device of the standard current transformer;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to the secondary winding end buttons K1-K13 of the two-stage precise current transformer with the current booster; a terminal K at the switching side of the secondary winding of the automatic switching device of the standard current transformer is connected to the B end of the secondary compensation winding of the two-stage precise current transformer with the current booster through a switch of the automatic switching device of the standard current transformer;
terminal buttons L1-L8 of the primary winding of the double-stage precision current transformer with the current booster are connected to the standard primary compensation ground through corresponding change-over switches; and the second secondary compensation winding terminal buttons B1-B13 of the two-stage precision current transformer with the current booster are connected to the standard secondary compensation ground through corresponding change-over switches.
The full-automatic calibrating device for the standard current transformer further comprises a program-controlled voltage regulating device and a full-automatic current load box; the program-controlled voltage regulating device and the full-automatic current load box are respectively electrically connected with the standard current transformer to be measured and the overspeed transformer calibrator.
In the utility model, the program-controlled voltage regulating device is used for rising current and falling current in the calibration process of the standard current transformer to be tested; the full-automatic current load box is used for providing current load in the calibration process of the standard current transformer to be tested.
According to the connection structure, the use method of the utility model is as follows:
(1) finishing the wiring of each device according to the connection relation;
(2) and (4) turning on a power supply of the check meter of the top-speed mutual inductor, and enabling the check meter to enter a main test stage.
(3) And opening a key switch of the program-controlled voltage-regulating control cabinet.
(4) The full automatic current loadbox switch of FZ15 is turned on,
(5) and (4) placing the current load box wave band switch in a K gear.
(6) The power supply of the automatic switching device of the standard current transformer is turned on, the power indicator lamp is turned on, the switching circuit of the standard current transformer and the switching circuit of the tested standard current transformer are in a standby state, and at the moment, an operator can automatically verify the switching circuit of the standard current transformer and does not need to additionally perform repeated wiring work.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a full-automatic calibrating installation of standard current transformer which characterized in that specifically includes: the system comprises a standard current transformer automatic switching device, a top-speed transformer calibrator and an upper computer; the measured standard current transformer is electrically connected with the automatic switching device of the standard current transformer; the standard mutual inductor automatic switching device is electrically connected with the top-speed mutual inductor calibrator; the top-speed mutual inductor calibrator is electrically connected with the upper computer.
2. The full-automatic calibrating device for the standard current transformer according to claim 1, wherein the standard current transformer to be tested can be calibrated according to the following specification parameters: 0.05-0.01S grade, primary current 5A-2000A, secondary current 5A or 1A.
3. The full-automatic calibrating device for the standard current transformer according to claim 1, wherein the check gauge for the ultimate transformer comprises 4 terminals, namely TX, T0, K and D; the TX end represents a signal end of a current transformer to be detected; the terminal T0 represents a signal terminal of a standard current transformer; the K end represents a difference signal end; the D terminal represents a ground terminal.
4. The full-automatic calibrating device for the standard current transformer according to claim 3, wherein the automatic switching device for the standard current transformer further comprises a two-stage precision current transformer with a current booster;
the two-stage precise current transformer with the current booster consists of a first-stage auxiliary current transformer and a second-stage main current transformer; the primary winding N1, the secondary winding N2 and the iron core T1 form a first-stage transformer, and the secondary windings N1, N2, the secondary compensation winding NB and the iron core T2 form a second-stage transformer;
the terminal buttons of the primary winding of the double-stage precision current transformer with the current booster are L1-L8, the terminal buttons are middle taps, L1 is a primary winding polar end, and L2-L8 are primary winding nonpolar ends;
the primary compensation winding of the double-stage precise current transformer with the current booster corresponds to L1-L8, and the terminal buttons are b1-b 8 and are used for indirect grounding; b1 is connected with a primary polarity end L1 in advance; b 2-b 8 are grounded;
the secondary winding terminal button of the double-stage precise current transformer with the current booster is K1-K13, is of a middle tap type and is disconnected at a K11 position;
the secondary compensation winding of the double-stage precise current transformer with the current booster corresponds to the secondary winding, the terminal button of the secondary compensation winding is B1-B13, and the secondary compensation winding is disconnected at the B11 position.
5. The full-automatic calibrating device for the standard current transformer according to claim 4, wherein the specific connection relationship between the automatic switching device for the standard current transformer and the to-be-measured standard current transformer and the check gauge for the pole speed transformer is as follows:
primary winding end buttons L1-LX of the standard current transformer are respectively and correspondingly electrically connected with end buttons L1-LX on the primary winding switching side of the automatic switching device of the standard current transformer;
the secondary winding terminal buttons K, K1-Kn of the standard current transformer are respectively electrically connected with the terminal buttons K, K1-Kn at the switching side of the secondary winding of the automatic switching device of the standard current transformer in a one-to-one correspondence manner; a terminal K1-Kn at the switching side of a secondary winding of the automatic switching device of the standard current transformer is connected to the TX end of the check meter of the top-speed transformer together through a corresponding switch;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to a first-stage current transformer L1-L8 of the two-stage precise current transformer with the current booster; a primary winding terminal button L of the standard current transformer is connected to the L corresponding to the primary winding terminal button of the two-stage precise current transformer with the current booster through a change-over switch of the automatic change-over device of the standard current transformer;
the other end button of the primary winding switching of the automatic switching device of the standard current transformer is respectively connected to the secondary winding end buttons K1-K13 of the two-stage precise current transformer with the current booster; a terminal K at the switching side of the secondary winding of the automatic switching device of the standard current transformer is connected to the B end of the secondary compensation winding of the two-stage precise current transformer with the current booster through a switch of the automatic switching device of the standard current transformer;
terminal buttons L1-L8 of the primary winding of the double-stage precision current transformer with the current booster are connected to the standard primary compensation ground through corresponding change-over switches; and the second secondary compensation winding terminal buttons B1-B13 of the two-stage precision current transformer with the current booster are connected to the standard secondary compensation ground through corresponding change-over switches.
6. The full-automatic calibrating device for the standard current transformer according to claim 4,
the full-automatic calibrating device for the standard current transformer further comprises a program-controlled voltage regulating device and a full-automatic current load box; the program-controlled voltage regulating device and the full-automatic current load box are respectively electrically connected with the standard current transformer to be measured and the overspeed transformer calibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121047994.4U CN216526259U (en) | 2021-05-17 | 2021-05-17 | Full-automatic calibrating device of standard current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121047994.4U CN216526259U (en) | 2021-05-17 | 2021-05-17 | Full-automatic calibrating device of standard current transformer |
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| Publication Number | Publication Date |
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| CN216526259U true CN216526259U (en) | 2022-05-13 |
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| CN202121047994.4U Active CN216526259U (en) | 2021-05-17 | 2021-05-17 | Full-automatic calibrating device of standard current transformer |
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- 2021-05-17 CN CN202121047994.4U patent/CN216526259U/en active Active
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