CN107479017B - Medium-frequency low-voltage high-current tester - Google Patents
Medium-frequency low-voltage high-current tester Download PDFInfo
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- CN107479017B CN107479017B CN201710898396.XA CN201710898396A CN107479017B CN 107479017 B CN107479017 B CN 107479017B CN 201710898396 A CN201710898396 A CN 201710898396A CN 107479017 B CN107479017 B CN 107479017B
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- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- 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
- G01R35/02—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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Ac-Ac Conversion (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention relates to an intermediate frequency low voltage large current tester, which comprises an autotransformer, a step-down transformer, a current transformer, a 100A contactor contact, a load resistor, a band switch and a contactor coil, wherein a 115V400Hz intermediate frequency power supply is output to the step-down transformer through the autotransformer, a 4V low voltage power supply is output by the step-down transformer, and one of the load resistors is selectively connected through the band switch to generate 83.5A400Hz test current for detecting the current transformer. The invention overcomes the defect of overlarge energy consumption of the old tester, reduces the noise of the intermediate frequency power supply during operation, lowers the cost, simplifies the structure, is easy to manufacture, has low failure rate, is safe and reliable, saves energy, protects the environment and is convenient to operate.
Description
Technical Field
The invention relates to the technical field of current testers, in particular to a medium-frequency low-voltage high-current tester.
Background
The rated working current of the current transformer is 83.5A (frequency 400 Hz), the current transformer tester used in the former production site directly generates 83.5A current by adopting a 115V intermediate frequency power supply (frequency 400 Hz), the capacity of the intermediate frequency power supply is 10 kilovolts, the energy consumption is too large during the use, and the noise of the intermediate frequency power supply is also large. If the intermediate frequency power supply 115V is reduced to thirty to fifty volts by a step-down transformer, which generates 83.5A current, the step-down transformer requires three to five kilovolts of power, and is heavy and consumes large energy. It is necessary to manufacture a medium-frequency low-voltage high-current tester to meet the production test requirements.
Disclosure of Invention
The invention aims to solve the technical problems of providing an intermediate-frequency low-voltage high-current tester which meets the requirements of small volume, economy, low noise and portability of current transformer testing.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
the intermediate-frequency low-voltage high-current tester comprises a first switch, an autotransformer, a step-down transformer, a current transformer, a first contact, a second contact, a third contact, a first load resistor, a second load resistor, a third load resistor, a second switch, a third switch, a first coil, a second coil and a third coil;
the first switch is connected with a primary side control input power switch of the autotransformer, and a secondary side of the autotransformer is connected with a primary side of the step-down transformer;
one end of the secondary side of the step-down transformer is connected with the current transformer, and the other end of the secondary side of the step-down transformer is connected with one ends of the first load resistor, the second load resistor and the third load resistor;
the first load resistor, the second load resistor and the third load resistor are respectively and correspondingly connected with the first contact, the second contact and the third contact, and one ends of the first contact, the second contact and the third contact, which are far away from the load resistor, are connected with one end of the primary side of the current transformer, which is far away from the step-down transformer;
the second switch is connected with a 24V switching power supply control input power supply switch, and the positive pole of the 24V switching power supply is connected in series with the third switch to control the electrifying of the first coil, the second coil and the third coil.
The autotransformer inputs an intermediate frequency power supply of 115V400Hz and outputs a variable voltage of 0-130V.
The primary side secondary side coil turns ratio of the step-down transformer is 115:4.
The rated current ratio of the current transformer is 100/5.
The first load resistor, the second load resistor and the third load resistor are made of special coarse brass rods.
The first contact, the second contact and the third contact are normally open contacts of the 100A contactor, and the first contact, the second contact and the third contact correspondingly control on-off through the first coil, the second coil and the third coil.
The third switch adopts a band switch.
The beneficial effects of the invention are as follows: the invention overcomes the defect of overlarge energy consumption of the old tester, reduces the noise of the intermediate frequency power supply during operation, lowers the cost, simplifies the structure, is easy to manufacture, has low failure rate, is safe and reliable, saves energy, protects the environment and is convenient to operate.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be further described in the following to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand.
A current transformer with a rated current of 83.5A, a power supply frequency of 400Hz and a rated current ratio of 100/5 requires a current tester to test the current transformer, which outputs 83.5A of current with a frequency of 400Hz. The current transformer tester used in the prior production field directly generates 83.5A of current by adopting a 115V intermediate frequency power supply (frequency 400 Hz), the capacity of the intermediate frequency power supply is 10 kilovolts, the energy consumption is too large when the current transformer tester is used, and the noise of the intermediate frequency power supply is also very large. If the intermediate frequency power supply 115V is reduced to thirty to fifty volts by a step-down transformer, which generates 83.5A current, the step-down transformer requires three to five kilovolts of power, and is heavy and consumes large energy. Through theoretical calculation and actual measurement, the output of the step-down transformer can be set to 4V. The step-down transformer is adopted to reduce the intermediate frequency power supply 115V to 4V, so that the step-down transformer has the capacity of only 0.5 kilovolt ampere, is economical, has smaller equipment volume and is convenient to operate.
As shown in fig. 1, the intermediate-frequency low-voltage high-current tester comprises a first switch K1, an autotransformer B1, a step-down transformer B2, a current transformer B3, a first contact KA, a second contact KB, a third contact KC, a first load resistor RA, a second load resistor RB, a third load resistor RC, a second switch K2, a third switch K3, a first coil C1, a second coil C2 and a third coil C3.
The first switch K1 is connected with a primary side control input power switch of the autotransformer B1, the input power is an intermediate frequency power supply of 115V400Hz, a secondary side of the autotransformer B1 is connected with an intermediate frequency power supply of 115V400Hz output by a primary side of the step-down transformer B2, one end of a secondary side of the step-down transformer B2 is connected with a low-voltage power supply of 4V400Hz output by the current transformer B3, the other end of the step-down transformer B2 is connected with one end of a first load resistor RA, a second load resistor RB and one end of a third load resistor RC, the first load resistor RA, the second load resistor RB and the third load resistor RC are respectively connected with a first contact KA, a second contact KB and a third contact KC correspondingly, one end of the first contact KA, the second contact KB and one end of the third contact KC far away from the load resistor is connected with one end of the current transformer B3, the second switch K2 is connected with a 24V switch power supply control input power supply, the input power supply is 220V50, the second load resistor RB and the third load resistor RC is connected with a third coil C3, the third load resistor KC is connected with a third coil C3, and the third coil C is connected with a common coil C3, and the third coil C3 is connected with a common coil C3.
The three 100A contactors are controlled by the band switch, only one contactor can work at a time, and only 83.5A can be generated. If three single-way switches are used for controlling three 100A contactors, two or three switch controls can be turned on, so that two or three 100A contactors are attracted, two or three load resistors are connected in parallel, the actual load resistor becomes one half or one third of the original load resistor, 83.5A which is doubled or tripled can be generated, the damage to an autotransformer and a 4V fixed transformer can be caused, and the current transformer and an ammeter can be overloaded.
The input of autotransformer B1 is 115V and the output is 0-130V. The process of the tester for generating 83.5A high current is that an autotransformer adjusts output voltage, the output voltage is added to an input end of a fixed step-down transformer, when the output voltage of an autotransformer B1 is 115V, the output of the fixed step-down transformer is 4V, the output voltage of about 4V is added to a load resistor, the load resistor is a specially-made thick brass rod, and the output voltage value (about 4V) of the fixed step-down transformer B2 is adjusted by adjusting the output of the autotransformer B1, so that 83.5A high current is generated. The detection requirement of the current transformer can be met.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a medium frequency low voltage heavy current tester which characterized in that: the transformer comprises a first switch (K1), an autotransformer (B1), a step-down transformer (B2), a current transformer (B3), a first contact (KA), a second contact (KB), a third contact (KC), a first load Resistor (RA), a second load Resistor (RB), a third load Resistor (RC), a second switch (K2) and a third switch (K3), wherein the first coil (C1), the second coil (C2) and the third coil (C3), the first switch (K1) is connected with a primary side control input power switch of the autotransformer (B1), and a secondary side of the autotransformer (B1) is connected with a primary side of the step-down transformer (B2);
one end of the secondary side of the step-down transformer (B2) is connected with the current transformer (B3), and the other end of the secondary side of the step-down transformer (B2) is connected with one ends of the first load Resistor (RA), the second load Resistor (RB) and the third load Resistor (RC);
the first load Resistor (RA), the second load Resistor (RB) and the third load Resistor (RC) are respectively and correspondingly connected to the first contact (KA), the second contact (KB) and the third contact (KC), and one ends of the first contact (KA), the second contact (KB) and the third contact (KC) far away from the load resistors are connected with one end of the primary side of the current transformer (B3) far away from the step-down transformer (B2);
the second switch (K2) is connected with a 24V switching power supply control input power supply switch, and the positive pole of the 24V switching power supply is connected in series with the third switch (K3) to control the electrifying of the first coil (C1), the second coil (C2) and the third coil (C3); the autotransformer (B1) outputs an intermediate frequency power supply of 115V and 400Hz and outputs variable voltage of 0-130V; the primary side secondary side coil turns ratio of the step-down transformer (B2) is 115:4, and the step-down transformer outputs 4V voltage.
2. An intermediate frequency low voltage high current tester according to claim 1, wherein: the rated current ratio of the current transformer (B3) is 100:5.
3. An intermediate frequency low voltage high current tester according to claim 1, wherein: the first load Resistor (RA), the second load Resistor (RB) and the third load Resistor (RC) adopt special coarse brass bars.
4. An intermediate frequency low voltage high current tester according to claim 1, wherein: the first contact (KA), the second contact (KB) and the third contact (KC) are normally open contacts of the 100A contactor, and the first contact (KA), the second contact (KB) and the third contact (KC) correspondingly control on-off through the first coil (C1), the second coil (C2) and the third coil (C3).
5. An intermediate frequency low voltage high current tester according to claim 1, wherein: the third switch (K3) adopts a band switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898396.XA CN107479017B (en) | 2017-09-28 | 2017-09-28 | Medium-frequency low-voltage high-current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898396.XA CN107479017B (en) | 2017-09-28 | 2017-09-28 | Medium-frequency low-voltage high-current tester |
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| Publication Number | Publication Date |
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| CN107479017A CN107479017A (en) | 2017-12-15 |
| CN107479017B true CN107479017B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710898396.XA Active CN107479017B (en) | 2017-09-28 | 2017-09-28 | Medium-frequency low-voltage high-current tester |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044479A (en) * | 2015-01-30 | 2015-11-11 | 国网河南省电力公司电力科学研究院 | Apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and method |
| CN205017222U (en) * | 2015-09-18 | 2016-02-03 | 深圳Tcl新技术有限公司 | Switching power supply and electronic equipment |
| WO2016201968A1 (en) * | 2015-06-16 | 2016-12-22 | 江苏现代电力科技股份有限公司 | Low-voltage power distribution voltage-regulating device |
| CN106740221A (en) * | 2017-01-06 | 2017-05-31 | 中国计量大学 | A kind of V2G radio energy two-way transmission apparatus based on low frequency PWM rectifier |
| CN207318697U (en) * | 2017-09-28 | 2018-05-04 | 国营芜湖机械厂 | A kind of intermediate frequency low-voltage high-current test device |
-
2017
- 2017-09-28 CN CN201710898396.XA patent/CN107479017B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044479A (en) * | 2015-01-30 | 2015-11-11 | 国网河南省电力公司电力科学研究院 | Apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and method |
| WO2016201968A1 (en) * | 2015-06-16 | 2016-12-22 | 江苏现代电力科技股份有限公司 | Low-voltage power distribution voltage-regulating device |
| CN205017222U (en) * | 2015-09-18 | 2016-02-03 | 深圳Tcl新技术有限公司 | Switching power supply and electronic equipment |
| CN106740221A (en) * | 2017-01-06 | 2017-05-31 | 中国计量大学 | A kind of V2G radio energy two-way transmission apparatus based on low frequency PWM rectifier |
| CN207318697U (en) * | 2017-09-28 | 2018-05-04 | 国营芜湖机械厂 | A kind of intermediate frequency low-voltage high-current test device |
Non-Patent Citations (1)
| Title |
|---|
| 金良盛 ; 郑于海 ; .大电流恒流源***的设计与实现.机电工程.2013,(09),全文. * |
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| CN107479017A (en) | 2017-12-15 |
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