CN203117408U - Testing device of silicon steel iron core ultimate hysteresis loop - Google Patents
Testing device of silicon steel iron core ultimate hysteresis loop Download PDFInfo
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- CN203117408U CN203117408U CN 201320113282 CN201320113282U CN203117408U CN 203117408 U CN203117408 U CN 203117408U CN 201320113282 CN201320113282 CN 201320113282 CN 201320113282 U CN201320113282 U CN 201320113282U CN 203117408 U CN203117408 U CN 203117408U
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 title abstract description 7
- 239000000523 sample Substances 0.000 claims abstract description 32
- 230000005291 magnetic effect Effects 0.000 claims description 52
- 238000009434 installation Methods 0.000 claims description 22
- 230000004907 flux Effects 0.000 claims description 4
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000011162 core material Substances 0.000 description 39
- 229920006395 saturated elastomer Polymers 0.000 description 14
- 230000005284 excitation Effects 0.000 description 12
- 238000004804 winding Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005417 remagnetization Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a testing device of a silicon steel iron core ultimate hysteresis loop. The testing device of the silicon steel iron core ultimate hysteresis loop comprises an autotransformer, a customized iron core, a primary coil, a secondary coil, a wave recording instrument, a current probe, a voltage probe and a current-limiting resistor, wherein the primary coil and the secondary coil are wound around two sides of the customized iron core, a high-voltage end of the autotransformer is in external connection with an alternating current power supply, the primary coil is connected with a low-voltage end of the autotransformer after being connected with the current-limiting resistor in series, a clamp type input end of the current probe is clamped on a current loop of the primary coil, an input end of the voltage probe is connected with the secondary coil, and an output end of the current probe and an output end of the voltage probe are respectively connected with a wave recording channel of the wave recording instrument. The testing device of the silicon steel iron core ultimate hysteresis loop has the advantages of being simple in structure and low in cost, is suitable for various experiment institutions and enterprises with needs for obtaining feature curves of ultimate hysteresis loops of silicon steel iron cores, and has a good application prospect.
Description
Technical field
The utility model relates to a kind of proving installation of measuring silicon steel core limit magnetic hysteresis loop in the current transformer under the 220V ac low-voltage power supply, belongs to the electric system technical field of measurement and test.
Background technology
The protective current mutual inductor is for measuring electric system abnormal running and the failure condition high-tension apparatus of electric current next time, its output result accurately whether, direct relation the normal operation of secondary devices such as protective relaying device and supervising device.At present, the domestic P class current transformer that adopts more, such current transformer belongs to ferromagnetic formula current transformer, and the closed silicon steel core that adopts silicon steel to make forms magnetic circuit, by the coupling of iron core internal magnetic field, with the little electric current of secondary for being directly proportional with it of big current transformation once.As everyone knows, there is hysteresis in ferromagnetic material, when selecting different magnetic field intensitys (being exciting current) when carrying out remagnetization, can obtain a series of magnetic hysteresis loops that vary in size.When increasing magnetic field, the area that magnetic hysteresis loop surrounds increases thereupon.When magnetic field intensity was enough big, this area reached certain limit, and this magnetic hysteresis loop that surrounds maximum area just is called limit magnetic hysteresis loop.
Along with power system development, the saturated problem that influences the normal operation of secondary device of P class current transformer core becomes increasingly conspicuous, when silicon steel core is saturated, distortion appears in secondary current, can not accurately reflect primary current, big quantity research and field operation experiences show, secondary device may produce wrong protection action because can not get exact current information, cause the saturated reason of silicon steel core mainly to comprise following several respects: when electric system is broken down, tens times even hundreds of times of electric current when the primary current of current transformer may reach normal the operation, and the transient DC component that often contains the exponential damping form, this will make silicon steel core by folk prescription significantly to excitation, thereby the state of saturation of entering; Also have the renewal of equipment such as current transformer often to lag behind the development of electric system rack, this can guarantee the undersaturated current transformer of silicon steel core under the failure condition when just making initial design, because the increase of power system capacity after this or the change of structure, it is saturated that silicon steel core takes place under failure condition, often there is remanent magnetism in silicon steel core, if remanent magnetism polarity is identical with the polarity of the magnetic field that fault current produces, then can make silicon steel core be more prone to saturated.
In order to assess the especially performance of P class current transformer under the state of saturation of various operating modes, can adopt experiment and two kinds of means of emulation, wherein, laboratory facilities need dispose the big current source of transient state and all kinds of pick-up unit, and technical difficulty and cost are very high; The tool and method that simulation means is used mainly comprises the PSB tool box software of ATP electromagnetic transient simulation software, MATLAB, based on the current transformer emulation mode of Preisach theory; above-mentioned emulation mode all needs the limit magnetic hysteresis loop data of silicon steel core as the emulation pacing items, and the research document that relates to above-mentioned emulation tool is seen doctorate paper " protective current transformer, saturated Research on Related Problems unshakable in one's determination " and journal article " based on transformer simulation modeling and the specificity analysis of MATLAB ".
For technical reason, silicon steel material manufacturer does not generally directly provide limit magnetic hysteresis loop data; In addition, magnetic field intensity adopts logarithmic coordinate system more among the excitation curve figure that producer provides, and can only be used for the excitation property of qualitative observation silicon steel material, is difficult to be reduced into accurate excitation property data.So, can only test to obtain the limit magnetic hysteresis loop data of silicon steel core material by excitation, the way of generally taking is as follows: by applying exciting current at elementary winding silicon steel core is activated to state of saturation, record excitation current waveform this moment and secondary winding no-load voltage waveform, can obtain limit magnetic hysteresis loop data by some mathematics manipulation again, if adopt said method directly current transformer to be carried out the words of saturated excitation, will run into some technical matterss, be that example describes with an actual current mutual inductor below, current mutual-inductor parameter is as follows: Z11 type cold-reduced silicon sheet iron core, effective magnetic circuit length 86cm, net sectional area 27cm2, no-load voltage ratio is 1:1200, by calculating, if arrive the iron core excitation saturated at secondary side (1200 circle winding side), required exciting current size is about 0.5A, and the induced voltage size is about 1200 volts, considers some allowances, the excitation volt-ampere number will be near 1kVA, and high pressure more than the 1kV will occur in the excitation side.
In sum, owing to the high pressure of the many volts of 1kV occurred, cause insulation and safety problem easily, had higher requirement in laboratory and experimenter, in addition, if reduce the number of turn of field copper, can reduce the induced potential of silicon steel core field copper when saturated, but can't reduce exciting watts, namely needing to improve exciting current provides silicon steel core saturated required exciting watts, will cause problems such as heating in winding is excessive and exciting current is excessive, influence the test result of excitation experiment.
The utility model content
The purpose of this utility model overcomes deficiency of the prior art, a kind of proving installation of under the 220V ac low-voltage power supply, measuring silicon steel core limit magnetic hysteresis loop in the current transformer that provides, has simple, the with low cost advantage of framework, be applicable to that various needs obtain characteristic experiment mechanism and the enterprise of the limit magnetic hysteresis loop of silicon steel core, have a good application prospect.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of proving installation of silicon steel core limit magnetic hysteresis loop, it is characterized in that: comprise autotransformer, the customization iron core, primary coil, secondary coil, oscillograph, current probe, voltage probe and current-limiting resistance, described primary coil and secondary coil are wrapped in the both sides of customization iron core, the high-pressure side external AC power supply of described autotransformer, described primary coil is connected with the low pressure end of autotransformer with current-limiting resistance series connection back, the jaw type input end pincers of described current probe are on the current return of primary coil, the input end of described voltage probe is connected with secondary coil, and the output terminal of described current probe and voltage probe is connected with the record ripple passage of oscillograph respectively.
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: the high-pressure side external AC power supply of described autotransformer, AC power are 220V.
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: the net sectional area S of described customization iron core is 5cm
2
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: during the customization core sataration, and the induced voltage E on the primary coil
Lsat, as shown in Equation (1),
E
lsat＝N
1·B
sat·S/45 （1）
Wherein, E
LsatSatisfy 5V≤E
Lsat≤ 50V, B
SatFor the customization iron core saturation flux close; S is the net sectional area of iron core processed.
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: during the customization core sataration, and the exciting current I on the primary coil
Lsat, as shown in Equation (2),
I
lsat＝H
sat·L/N
1 （2）
Wherein, I
LsatSatisfy I
Lsat≤ 50A, H
SatBe the saturation magnetic field intensity of customization iron core, L is the magnetic circuit average length of customization iron core.
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: described current-limiting resistance is used for the exciting current I on the restriction primary coil
LsatSize, resistance are 0.5 Ω.
The proving installation of aforesaid silicon steel core limit magnetic hysteresis loop is characterized in that: the effective value of the range of described current probe is 150A.
The beneficial effects of the utility model are: the proving installation of silicon steel core limit magnetic hysteresis loop in the measurement current transformer that the utility model provides, can be under the 220V ac low-voltage power supply limit magnetic hysteresis loop of silicon steel core in the measuring current mutual inductor, induced voltage when silicon steel core is saturated on the field coil is suppressed at below the 50V, exciting current is suppressed at below the 50A, the too high insulation safety problem that causes of induced voltage and the excessive heating problem that causes of exciting current have been avoided, framework is simple, obvious advantages such as cost is low, be applicable to that various needs obtain core material limit magnetic hysteresis loop characteristic experiment mechanism and enterprise, have a good application prospect.
Description of drawings
Fig. 1 is the structural representation of the proving installation of silicon steel core limit magnetic hysteresis loop of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, a kind of proving installation of silicon steel core limit magnetic hysteresis loop, comprise autotransformer 1, customization iron core 2, primary coil 3, secondary coil 4, oscillograph 5, current probe 6, voltage probe 7 and current-limiting resistance 8, described primary coil 3 and secondary coil 4 are wrapped in the both sides of customization iron core 2, the high-pressure side external AC power supply of autotransformer 1, AC power is 220V, primary coil 3 is connected with the low pressure end of autotransformer 1 with current-limiting resistance 8 series connection backs, the jaw type input end pincers of current probe 6 are on the current return of primary coil 3, the input end of voltage probe 7 is connected with secondary coil 4, and the output terminal of current probe 6 and voltage probe 7 is connected with the record ripple passage of oscillograph 5 respectively.
When above-mentioned customization iron core 2 is saturated, the induced voltage E on the primary coil 3
Lsat, as shown in Equation (1),
E
lsat＝N
1·B
sat·S/45 （1）
Wherein, E
LsatSatisfy 5V≤E
Lsat≤ 50V, B
SatFor the customization iron core 2 saturation flux close; S is the net sectional area of iron core processed, and net sectional area S is 5cm here
2
During the customization core sataration, the exciting current I on the primary coil
Lsat, as shown in Equation (2),
I
lsat＝H
sat·L/N
1 （2）
Wherein, I
LsatSatisfy I
Lsat≤ 50A, H
SatBe the saturation magnetic field intensity of customization iron core, L is the magnetic circuit average length of customization iron core.
Described oscillograph 5 adopts the DL850 type oscillograph of Yokogawa company (YOKOGAWA), and its first record ripple channel C h1 is used for enrolling the exciting current signal in primary coil 3 loops, and the second record ripple channel C h2 is used for enrolling the open-circuit voltage signal of secondary coil 4;
Described current probe 6, the excitation current waveform for admission primary coil 3 loops adopts the Current probe701930 type current probe of Yokogawa company, the range of this model current probe is the 150A(effective value);
Described voltage probe 7: be used for the open-circuit voltage signal of admission secondary coil 4, adopt the Isolated probe701929 type voltage probe of Yokogawa company.
Described current-limiting resistance 8 is used for the exciting current I on the restriction primary coil 3
1satSize, resistance are 0.5 Ω.
Method of testing based on the proving installation of silicon steel core limit magnetic hysteresis loop of the present utility model may further comprise the steps,
Step (1) transfers to 0V with the low pressure end voltage of autotransformer 1, connects the 220V AC power;
Step (2) arranges the sampling period ▽ T of oscillograph 5, with the exciting current I of the first record ripple channel C h1 admission
LsatRecord the E of the induced voltage of ripple channel C h2 admission for X-axis, second
LsatIntegration is Y-axis;
Step (3) increases the low pressure end voltage of autotransformer 1 gradually, observe the waveform of the X-Y axle on the oscillograph 5, when the ascending branch of waveform and the part curve on the decent overlapped fully, it was saturated then to formulate iron core 2, stops to increase the low pressure end voltage of autotransformer 1;
The exciting current I that step (4) is enrolled the first record ripple channel C h1 in real time
LsatInduced voltage E with the second record ripple channel C h2 admission
LsatImport to PC, establish exciting current I
LsatSampling numerical value is i[k], induced voltage numerical value is u[k], k is sample sequence number;
Step (5) is calculated the magnetic flux density B[k that formulates iron core 2 according to formula (3)],
Wherein, B[1] be initial value for integral, B[k] maximum value and minimizing absolute value equate;
Step (6) is calculated the magnetic field intensity H[k that formulates iron core 2 according to formula (4)],
Step (7) is got the B[k in several sampling periods] and H[k] mean value;
The B[k of the one-period after step (8) will be averaged] and H[k] make form, the data of form correspondence are the limit magnetic hysteresis loop data of customization iron core 2.
In sum, the utility model is measured the proving installation of silicon steel core limit magnetic hysteresis loop in the current transformer, can be under the 220V ac low-voltage power supply limit magnetic hysteresis loop of silicon steel core in the measuring current mutual inductor, induced voltage when silicon steel core is saturated on the field coil is suppressed at below the 50V, exciting current is suppressed at below the 50A, the too high insulation safety problem that causes of induced voltage and the excessive heating problem that causes of exciting current have been avoided, framework is simple, obvious advantages such as cost is low, be applicable to that various needs obtain core material limit magnetic hysteresis loop characteristic experiment mechanism and enterprise, have a good application prospect.
More than show and described ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is by appending claims and equivalent circle thereof.
Claims (7)
1. the proving installation of a silicon steel core limit magnetic hysteresis loop, it is characterized in that: comprise autotransformer, the customization iron core, primary coil, secondary coil, oscillograph, current probe, voltage probe and current-limiting resistance, described primary coil and secondary coil are wrapped in the both sides of customization iron core, the high-pressure side external AC power supply of described autotransformer, described primary coil is connected with the low pressure end of autotransformer with current-limiting resistance series connection back, the jaw type input end pincers of described current probe are on the current return of primary coil, the input end of described voltage probe is connected with secondary coil, and the output terminal of described current probe and voltage probe is connected with the record ripple passage of oscillograph respectively.
2. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1, it is characterized in that: the high-pressure side external AC power supply of described autotransformer, AC power are 220V.
3. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1, it is characterized in that: the net sectional area S of described customization iron core is 5cm
2
4. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1 is characterized in that: during the customization core sataration, and the induced voltage E on the primary coil
Lsat, as shown in Equation (1),
E
lsat＝N
1·B
sat·S/45 （1）
Wherein, E
LsatSatisfy 5V≤E
Lsat≤ 50V, B
SatFor the customization iron core saturation flux close; S is the net sectional area of iron core processed.
5. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1 is characterized in that: during the customization core sataration, and the exciting current I on the primary coil
Lsat, as shown in Equation (2),
I
lsat＝H
sat·L/N
1 （2）
Wherein, I
LsatSatisfy I
Lsat≤ 50A, H
SatBe the saturation magnetic field intensity of customization iron core, L is the magnetic circuit average length of customization iron core.
6. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1 is characterized in that: described current-limiting resistance is used for the exciting current I on the restriction primary coil
LsatSize, resistance are 0.5 Ω.
7. the proving installation of silicon steel core limit magnetic hysteresis loop according to claim 1, it is characterized in that: the effective value of the range of described current probe is 150A.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320113282 CN203117408U (en) | 2013-03-13 | 2013-03-13 | Testing device of silicon steel iron core ultimate hysteresis loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320113282 CN203117408U (en) | 2013-03-13 | 2013-03-13 | Testing device of silicon steel iron core ultimate hysteresis loop |
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| CN203117408U true CN203117408U (en) | 2013-08-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176148A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Testing device and testing method for silicon steel core limit hysteresis loop |
| CN103558573A (en) * | 2013-11-14 | 2014-02-05 | 中国三冶集团有限公司电气安装工程公司 | Performance testing method for voltage transformer |
| CN110045307A (en) * | 2019-05-28 | 2019-07-23 | 福州大学 | A kind of core material hysteresis measurement method |
-
2013
- 2013-03-13 CN CN 201320113282 patent/CN203117408U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176148A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Testing device and testing method for silicon steel core limit hysteresis loop |
| CN103558573A (en) * | 2013-11-14 | 2014-02-05 | 中国三冶集团有限公司电气安装工程公司 | Performance testing method for voltage transformer |
| CN103558573B (en) * | 2013-11-14 | 2016-01-20 | 中国三冶集团有限公司 | A kind of performance test methods of voltage transformer (VT) |
| CN110045307A (en) * | 2019-05-28 | 2019-07-23 | 福州大学 | A kind of core material hysteresis measurement method |
| CN110045307B (en) * | 2019-05-28 | 2021-11-02 | 福州大学 | Magnetic core material hysteresis loop measuring method |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130807 Effective date of abandoning: 20140702 |
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| RGAV | Abandon patent right to avoid regrant |