CN110703176A - Current transformer error testing system and method under limit temperature - Google Patents
Current transformer error testing system and method under limit temperature Download PDFInfo
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- CN110703176A CN110703176A CN201911196462.4A CN201911196462A CN110703176A CN 110703176 A CN110703176 A CN 110703176A CN 201911196462 A CN201911196462 A CN 201911196462A CN 110703176 A CN110703176 A CN 110703176A
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- 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
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
A system and a method for testing errors of a current transformer at a limiting temperature are used for performance evaluation work of the current transformer for a distribution network, and relate to the field of transformer performance tests. The system comprises a limit temperature test box, a current transformer error test unit, a switching row, a contactor and a connecting wire, can complete error tests of the current transformer under the conditions of high limit temperature, low limit temperature and normal temperature under the condition of primary wiring, automatically calculates test results, forms original records and reports, does not need manual intervention, does not need to repeatedly carry tested current transformers, is simple and convenient to operate, greatly reduces the test labor intensity, improves the test efficiency and the intelligent degree, and is particularly suitable for error tests of the current transformer under the limit temperature.
Description
Technical Field
The invention belongs to the technical field of mutual inductor performance tests, and particularly relates to a system and a method for testing errors of a current mutual inductor at a limit temperature.
Background
The current transformer plays a role in current conversion according to a ratio, is used for providing current signals with an accurate proportion relation with a primary loop for electrical measurement, electric energy metering and automation devices, and is also used for providing signals for instruments and relay protection, so that the reliability, stability and accuracy of the transformer play an important role in safe operation and marketing metering of an electric power system.
The existing error testing device for the current transformer at the limit temperature comprises an environmental test box, a voltage regulator, a current booster, a standard current transformer, a calibration instrument, a load box, a temperature measuring instrument, a test line, a forklift and the like, the equipment is scattered, the test steps are complex, the heating, cooling and error measurement processes are separated, the current transformer to be tested needs to be carried to the environmental test box in the limit high-temperature test, the current transformer to be tested is carried out of the environmental test box after the temperature is raised to the limit high temperature, then the wiring is carried out to measure the error of the current transformer to be tested, and the error change of the current transformer to be tested at the normal temperature and the high temperature needs to be manually calculated; the error test principle of the current transformer at the extreme low temperature is the same as that at the extreme high temperature; accomplish under the extreme temperature current transformer error test need tear open the line 3 times at least, 2 times will be carried out environmental test case by the current transformer transport of trying, by the current transformer of trying a matter and reach dozens of kilograms, need 2 people's transport at least, intensity of labour is big, and intelligent degree is low, and temperature measurement is inaccurate, the experimental development of being not convenient for, is difficult to be applicable to the mutual-inductor examination demand that increases fast.
Disclosure of Invention
The invention provides a system and a method for testing the error of a current transformer at an extreme temperature, aiming at the problems of low working efficiency, high labor intensity, scattered equipment, complex steps, inaccurate temperature and humidity measurement and the like of a current transformer error testing device at the extreme temperature in the prior art, so as to ensure the safe, accurate and efficient realization of the verification of the current transformer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a current transformer error test system under extreme temperature, characterized by includes: the device comprises a limit temperature test box, a current transformer error test unit, a switching row, a contactor and a connecting wire; the tested current transformer is arranged in a limit temperature test box, and the limit temperature test box is used for heating, cooling and measuring the temperature of the tested current transformer; the current transformer error testing unit is used for carrying out error tests on the tested current transformer; the switching row and the connecting wire are used for connecting the tested current transformer to the current transformer error testing unit; the contactor is used for opening or closing error tests.
In order to optimize the technical scheme, the specific measures adopted further comprise:
further, the current transformer error testing unit comprises a voltage regulating source, a current rising source, a standard current transformer and an error testing and controlling device; the voltage regulating source input winding is connected with a laboratory power supply through a relay, the voltage regulating source input winding is connected with the current rising source input winding, the current rising source output winding is connected with the primary winding of the standard current transformer and the primary winding of the tested current transformer in series through a switching row and a connecting wire, the secondary winding of the standard current transformer and the secondary winding of the tested current transformer are connected through the switching row and the connecting wire, and the secondary winding of the standard current transformer and the secondary winding of the tested current transformer are both connected to the error testing and controlling device.
Furthermore, the error testing and controlling device comprises an error measuring unit, a controlling unit, a load unit and a man-machine interaction screen; the device comprises an error measuring unit, a load unit, a control unit and a man-machine interaction screen, wherein the error measuring unit is used for measuring and calculating errors, the load unit is used for applying test load to a tested current transformer, the control unit is used for test control, and the man-machine interaction screen is used for displaying test data and inputting test instructions.
Further, the primary winding L of the standard current transformerC1Primary winding L of end and tested current mutual inductorX1End-to-end, primary winding L of standard current transformerC2The end of the primary winding L is connected with the output winding of the current rising source, and the primary winding L of the tested current transformerX2The end is grounded; secondary winding K of standard current transformerC1Secondary winding K of end and tested current transformerX1The ends are connected and both ends are connected with a K end of an error measuring unit and a secondary winding K of a standard current transformerC2T of the terminal access error measurement unit0Secondary winding K of end to-be-tested current transformerX2T of end flow and error measuring unit after passing through load unitxThe ends are connected, and the D end of the error measuring unit is grounded; the control unit is respectively connected with the voltage regulating source, the contactor, the load unit, the error measuring unit and the human-computer interaction screen, and functions of starting and closing an error test, increasing and decreasing voltage, calculating errors, switching loads and generating original records and certificates are achieved.
Furthermore, the limit temperature test box comprises a box body, a temperature lifting device and a temperature monitoring device, wherein the temperature lifting device and the temperature monitoring device are arranged in the box body, and the control unit is connected with the temperature lifting device and the temperature monitoring device respectively to realize the functions of temperature lifting and temperature monitoring.
Further, the connecting wire comprises a high-current wire and a secondary connecting wire, and the high-current wire and the secondary connecting wire are both resistant to extreme temperature and conventional.
Furthermore, the switching row is provided with a LC1、LC2、LX1、LX2、KC1、KC2、KX1、KX2Terminal-adapted connecting terminal, wherein LX1、LX2The connecting terminal is connected with a high-current lead resistant to extreme temperature, KX1、KX2The connection terminal of (2) is connected with a secondary connection line resistant to extreme temperature, LC1、LC2Connecting terminal of (A) is connected with a conventional large-current lead, KC1、KC2The connecting terminal of (a) is connected with a conventional secondary connecting wire.
In addition, the invention also provides a test method of the error test system of the current transformer, which is characterized by comprising the following steps:
(1) placing the tested current transformer in a limit temperature test box to finish test wiring;
(2) inputting test parameters on a man-machine interaction screen of the error testing and controlling device, and clicking to start a test;
(3) the control unit controls the contactor to be switched on, controls the current to rise, calculates and records error data of the tested current transformer at room temperature, and controls the contactor to be switched off after the test is finished;
(4) the control unit controls the temperature lifting device to rise to 55 ℃ and maintains the temperature at 55 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the contactor to be switched on, controls the current rising, calculates and records error data of the tested current transformer at the maximum high temperature, and controls the switch to be switched off after the test is finished;
(5) the control unit controls the temperature rising device to rise to-25 ℃ and maintain the temperature at-25 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the contactor to close, controls the rising current, calculates and records error data of the tested current transformer at the extreme low temperature, and controls the opening brake after the test is finished;
(6) after error tests under the conditions of room temperature, extreme high temperature and extreme low temperature, the control unit automatically calculates the variation of the three tests to form test records and reports;
(7) and (4) ending the test, and removing the test wiring.
The invention has the beneficial effects that:
1) the whole set of tests of normal temperature error, low temperature difference and high temperature can be completed only by once wiring of one set of device, the tested current transformer does not need to be carried repeatedly, and the wiring does not need to be dismantled repeatedly, so that the manpower requirement is greatly reduced, and the test efficiency is improved;
2) when the device is used for error test at the limit temperature, the tested current transformer is always in the limit temperature test box, and hands can not contact the tested current transformer at the limit temperature, so that the test safety is improved;
3) the whole process of error measurement, temperature rise, temperature monitoring, error measurement, comparison variation, temperature reduction, temperature monitoring, error measurement and comparison variation is independently completed, only a starting instruction needs to be input, the whole test process does not need manual intervention, and the intelligent degree is greatly improved.
Drawings
Fig. 1 is a schematic diagram of an error testing system of a current transformer at a limit temperature according to an embodiment of the invention.
FIG. 2 is a control block of a control unit in the error testing system of the current transformer under the limit temperature.
FIG. 3 is a flow chart of a current transformer error test at extreme temperatures.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
A current transformer error test system under limit temperature is used for carrying out error tests on a tested current transformer under the conditions of limit high temperature, limit low temperature and normal temperature according to regulation requirements, automatically calculating test results, judging the test results and forming original records and reports. The system comprises a limit temperature test box 1, a current transformer error test unit, a switching row, a contactor and a connecting line.
The tested current transformer 2 is placed in the limit temperature test box 1 in the whole test process, and the limit temperature test box 1 is used for heating, cooling and measuring the temperature of the tested current transformer 2; the current transformer error testing unit is used for carrying out an error test on the tested current transformer 1; the switching row and the connecting wire are used for connecting the tested current transformer 2 to the current transformer error testing unit. The contactor is used for opening or closing a current transformer error test.
The current transformer error testing unit comprises a voltage regulating source 3, a current rising source 4, a standard current transformer 5 and an error testing and controlling device; the error testing and controlling device comprises an error measuring unit, a load unit, a control unit and a man-machine interaction screen; the error measuring unit is used for measuring and calculating errors, the load unit is used for applying test loads to the tested current transformer 2, the control unit is used for controlling voltage increase and decrease, temperature increase and decrease and the like, and the man-machine interaction screen is used for displaying test data and inputting test instructions.
The limit temperature test box 1 comprises a box body, a temperature lifting device and a temperature monitoring device; the connecting wires comprise a large-current wire 8 and a secondary connecting wire 9; the large-current wire 8 and the secondary connection wire 9 are classified into two types of resistance to extreme temperatures and conventional resistance. The switching row is embedded on the right side of the box body of the limit temperature test box 1 and comprises a primary winding connecting terminal (connecting L)C1、LX1、LC2、LX2) Secondary winding connection terminal (connection K)C1、KX1、KC2、KX2) Signal terminal SC（SX) (ii) a The switching row depends on the primary winding L at the inner side of the temperature test box 1X1LX2The connecting terminal is connected with a high-current lead resisting extreme temperature and a secondary winding KX1、KX2The connecting terminal is connected with a secondary connecting wire resistant to extreme temperature; the primary winding L of the switching row is close to the outer side of the temperature test box 1C1LC2The connecting terminal is connected with a conventional large-current lead and a secondary winding KC1、KC2The connecting terminal is connected with a conventional secondary connecting wire.
As shown in figure 1, the electrical schematic diagram of the invention is shown, wherein the input winding of the voltage regulating source 3 is connected with the laboratory power supply 7 through the relay 6, the input winding of the voltage regulating source 3 is connected with the input winding of the current rising source 4, the output winding of the current rising source 4 is connected with the primary winding L of the standard current transformer 5C1、LC2And primary winding L of tested current transformer 2X1LX2The series connection is realized through a large-current lead 8 and a switching bar; standard current transformer 5 secondary winding KC1、KC2Secondary winding K of tested current transformer 2X1、KX2The connection is realized by a secondary connecting line 9 and a switching bar, wherein KC1And KX1After being connected in series, the differential current signal flows into a terminal K of an error measuring unit and a standard current transformer KC2Terminal and error measuring unit T0The terminal is connected and inputs a standard current signal; secondary winding K of tested current transformer 2X2After passing through the load cell, and an error measuring unit TxThe terminal is grounded after being connected.
As shown in fig. 2, the control unit is connected to the temperature raising and lowering device, the temperature monitoring device, the voltage regulating source 3, the contactor, the load unit, the error measuring unit and the man-machine interaction screen, respectively, to realize the functions of raising and lowering the temperature, monitoring the temperature, starting and closing an error test, raising and lowering the voltage, calculating an error, switching the load, and generating an original record and a certificate.
As shown in fig. 3, the testing method flow of the invention is that the method for testing the error of the current transformer under the limit temperature is as follows:
(1) placing the tested current transformer in a limit temperature test box to finish test wiring;
(2) inputting test parameters on a man-machine interaction screen of the error testing and controlling device, and clicking to start a test;
(3) the control unit controls the contactor to be switched on, controls the rising current, calculates and records the error data of the tested current transformer at room temperature, and controls the switch to be switched off after the test is finished;
(4) the control unit controls the temperature lifting device to rise to 55 ℃ and maintains the temperature at 55 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the contactor to close, controls the current rising, calculates and records error data of the tested current transformer at the maximum high temperature, and controls the opening after the test is finished;
(5) the control unit controls the temperature rising device to rise to-25 ℃ and maintains the temperature at-25 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the control contactor to switch on, controls the rising current, calculates and records error data of the tested current transformer at the extreme low temperature, and controls the switch-off after the test is finished;
(6) after error tests under the conditions of room temperature, extreme high temperature and extreme low temperature, the control unit automatically calculates the variation of the three tests to form test records and reports;
(7) and (4) turning off the power supply, removing the test wiring and taking the equipment out of the warehouse after the test is finished.
It should be noted that the terms "upper", "lower", "left", "right", "front", "back", etc. used in the present invention are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not limited by the technical contents of the essential changes.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. A current transformer error test system under extreme temperature, characterized by includes: the device comprises a limit temperature test box (1), a current transformer error test unit, a switching row, a contactor and a connecting wire; the tested current transformer (2) is arranged in a limit temperature test box (1), and the limit temperature test box (1) is used for heating, cooling and measuring the temperature of the tested current transformer (2); the current transformer error testing unit is used for carrying out an error test on the tested current transformer (2); the switching row and the connecting wire are used for connecting a tested current transformer (2) to a current transformer error testing unit; the contactor is used for opening or closing error tests.
2. The system for testing the error of the current transformer at the limit temperature according to claim 1, wherein: the current transformer error testing unit comprises a voltage regulating source (3), a current rising source (4), a standard current transformer (5) and an error testing and controlling device; the voltage regulation source (3) input winding is connected with a laboratory power supply (7) through a relay (6), the voltage regulation source (3) input winding is connected with the current rising source (4) input winding, the current rising source (4) output winding is connected with a standard current transformer (5) primary winding and a tested current transformer (2) primary winding in series through a switching row and a connecting wire, the standard current transformer (5) secondary winding and the tested current transformer (2) secondary winding are connected through the switching row and the connecting wire, and the standard current transformer (5) secondary winding and the tested current transformer (2) secondary winding are both connected to an error testing and controlling device.
3. The system for testing the error of the current transformer at the limit temperature according to claim 2, wherein: the error testing and controlling device comprises an error measuring unit, a controlling unit, a load unit and a man-machine interaction screen; the device comprises an error measuring unit, a load unit, a control unit and a man-machine interaction screen, wherein the error measuring unit is used for measuring and calculating errors, the load unit is used for applying test load to a tested current transformer (2), the control unit is used for test control, and the man-machine interaction screen is used for displaying test data and inputting test instructions.
4. A limiting temperature current transformer error testing system as claimed in claim 3 wherein: the primary winding L of the standard current transformer (5)C1Primary winding L of end and tested current transformer (2)X1End-to-end, primary winding L of standard current transformer (5)C2The end of the primary winding L is connected with the output winding of the current rising source (4) and the primary winding L of the tested current transformer (2)X2The end is grounded; secondary winding K of standard current transformer (5)C1Secondary winding K of end and tested current transformer (2)X1The ends are connected, the two ends are connected with a K end of an error measuring unit, and a secondary winding K of a standard current transformer (5)C2T of the terminal access error measurement unit0End, secondary winding K of tested current transformer (2)X2T of end flow and error measuring unit after passing through load unitxAre connected end to endThe D end of the error measuring unit is grounded; the control unit is respectively connected with the voltage regulating source (3), the contactor, the load unit, the error measuring unit and the human-computer interaction screen, and functions of starting and closing an error test, increasing and decreasing voltage, calculating errors, switching loads and generating original records and certificates are achieved.
5. A limiting temperature current transformer error testing system as claimed in claim 3 wherein: the limit temperature test box (1) comprises a box body, a temperature lifting device and a temperature monitoring device, wherein the temperature lifting device and the temperature monitoring device are arranged in the box body, and a control unit is connected with the temperature lifting device and the temperature monitoring device respectively to realize the functions of temperature lifting and temperature monitoring.
6. The system for testing the error of the current transformer at the limit temperature according to claim 4, wherein: the connecting wire includes heavy current wire (8) and secondary connecting wire (9), heavy current wire (8) and secondary connecting wire (9) all divide into and endure limit temperature and conventional two kinds.
7. The system for testing the error of the current transformer at the limit temperature according to claim 6, wherein: the switching row is provided with a power supply line LC1、LC2、LX1、LX2、KC1、KC2、KX1、KX2Terminal-adapted connecting terminal, wherein LX1、LX2The connecting terminal is connected with a high-current lead resistant to extreme temperature, KX1、KX2The connection terminal of (2) is connected with a secondary connection line resistant to extreme temperature, LC1、LC2Connecting terminal of (A) is connected with a conventional large-current lead, KC1、KC2The connecting terminal of (a) is connected with a conventional secondary connecting wire.
8. A testing method using the current transformer error testing system of claim 5, comprising the steps of:
(1) placing the tested current transformer in a limit temperature test box to finish test wiring;
(2) inputting test parameters on a man-machine interaction screen of the error testing and controlling device, and clicking to start a test;
(3) the control unit controls the contactor to be switched on, controls the current to rise, calculates and records error data of the tested current transformer at room temperature, and controls the contactor to be switched off after the test is finished;
(4) the control unit controls the temperature lifting device to rise to 55 ℃ and maintains the temperature at 55 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the contactor to be switched on, controls the current rising, calculates and records error data of the tested current transformer at the maximum high temperature, and controls the switch to be switched off after the test is finished;
(5) the control unit controls the temperature rising device to rise to-25 ℃ and maintain the temperature at-25 ℃ for 2h, during the temperature keeping period, after the temperature monitoring device monitors that the temperature change of the tested current transformer does not exceed +/-2 ℃, the control unit controls the contactor to close, controls the rising current, calculates and records error data of the tested current transformer at the extreme low temperature, and controls the opening brake after the test is finished;
(6) after error tests under the conditions of room temperature, extreme high temperature and extreme low temperature, the control unit automatically calculates the variation of the three tests to form test records and reports;
(7) and (4) ending the test, and removing the test wiring.
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| CN201911196462.4A CN110703176A (en) | 2019-11-29 | 2019-11-29 | Current transformer error testing system and method under limit temperature |
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| CN111580034A (en) * | 2020-05-13 | 2020-08-25 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Integrated current transformer temperature rise test system and test method |
| CN111693925A (en) * | 2020-07-20 | 2020-09-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN112068062A (en) * | 2020-09-10 | 2020-12-11 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
| CN112269077A (en) * | 2020-10-10 | 2021-01-26 | 苏州中康电力运营有限公司 | Testing device and testing method for oil-immersed transformer |
| CN114069641A (en) * | 2021-11-18 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Intelligent load box device and inspection method |
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| CN111693925A (en) * | 2020-07-20 | 2020-09-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
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| CN112068062A (en) * | 2020-09-10 | 2020-12-11 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
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| CN112269077A (en) * | 2020-10-10 | 2021-01-26 | 苏州中康电力运营有限公司 | Testing device and testing method for oil-immersed transformer |
| CN114069641A (en) * | 2021-11-18 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Intelligent load box device and inspection method |
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