CN108281269B - Converter station direct current detection mutual inductor - Google Patents
Converter station direct current detection mutual inductor Download PDFInfo
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- CN108281269B CN108281269B CN201810097740.XA CN201810097740A CN108281269B CN 108281269 B CN108281269 B CN 108281269B CN 201810097740 A CN201810097740 A CN 201810097740A CN 108281269 B CN108281269 B CN 108281269B
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- mutual inductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/288—Shielding
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to a direct current detection mutual inductor of a converter station, which comprises a Hall current mutual inductor (1), an error correction current mutual inductor (2) and a shielding magnetic yoke (3), wherein the Hall current mutual inductor (1) and the error correction current mutual inductor (2) are arranged in parallel, and a primary lead of the Hall current mutual inductor and the error correction current mutual inductor is perforated and coaxial; and primary lead through holes are formed in two ends of the shielding magnetic yoke (3) and are coaxially arranged with the primary lead through holes of the Hall current transformer (1) and the error correction current transformer (2). Compared with the prior art, the method greatly improves the safety and the accuracy of the direct current detection of the converter station, and is very convenient to use.
Description
Technical Field
The invention relates to power measuring equipment, in particular to a direct current detection mutual inductor for a converter station.
Background
The direct current converter station bears the important functions of transmitting western and east electricity and landing high-capacity clean energy, about 70% of regional external electricity is transmitted to a 500KV main network in the Shanghai through 4 converter stations during the electricity utilization peak in the Shanghai, the operation reliability of primary and secondary equipment of the converter station is directly related to the safety of power grid operation, the online monitoring technology of electrical equipment widely applied and researched in recent years greatly improves the operation reliability of the electrical equipment, however, due to the particularity of the equipment of the converter station, many important equipment do not have an effective online monitoring technology so far, and the healthy operation of the equipment of the converter station is influenced.
Due to the low voltage level, the operation health level of bipolar public area equipment of the converter station is often ignored, and an effective online monitoring technology is not available, however, once the equipment in the area fails, serious grid accidents of direct current bipolar locking can be caused. The bipolar public area equipment of the converter station is various in types, such as an impact capacitor, a lightning arrester, a wave trap, a reactor and the like, and a serious accident of bipolar locking can be caused when any element fails or is punctured to the ground, so that a high-practicability online monitoring technology is developed for the bipolar public area equipment of the converter station, and the abnormality of the equipment is found in time, which is particularly necessary.
The most central devices in the bipolar public area of the converter station are an impact capacitor, an arrester, a reactor, a direct current switch and a voltage divider, and in view of more breakdown faults of the impact capacitor and the arrester in history, the most important and economic detection means is to detect the working conditions of the impact capacitor and the arrester firstly. The direct current field impact capacitor and the lightning arrester normally flow high-frequency alternating current with little direct current component, for the lightning arrester, if the lightning arrester operates in a power frequency environment, the difference between the capacitive component and the resistive component of the flowing current is not large, the low-voltage side lightning arrester of the direct current field is only dozens to hundreds of volts because the direct current voltage of the lightning arrester is the voltage drop of the unbalanced current of the neutral line on the grounding electrode line, therefore, the resistance current as the direct current component is very small, the difficulty is high for accurate detection, on the other hand, the interference of the alternating current and direct current electric field and the magnetic field of the outdoor site of the converter station is severe, for the most central equipment in the bipolar public area of the external converter station, namely the surge capacitor, the lightning arrester, the reactor, the direct current switch and the voltage divider, in view of more breakdown faults of the surge capacitor and the lightning arrester in history, therefore, the most important and economical detection means is to detect the working conditions of the surge capacitor and the lightning arrester firstly.
The direct current field impact capacitor and the lightning arrester normally flow high-frequency alternating current, flowing direct current components are few, for the lightning arrester, if the lightning arrester operates in a power frequency environment, the capacitance and the resistance components of flowing current are not greatly different, the low-voltage side lightning arrester of the direct current field is generated by the voltage drop of neutral line unbalanced current on a grounding electrode circuit and is only dozens to hundreds of volts because the direct current voltage of the lightning arrester is the voltage drop of the neutral line unbalanced current, so that the resistance current as the direct current component is very small, and the anti-interference performance is a crucial problem for a serious Hall sensor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a direct current detection transformer for a converter station.
The purpose of the invention can be realized by the following technical scheme:
a direct current detection mutual inductor of a converter station comprises a Hall current mutual inductor, an error correction current mutual inductor and a shielding magnetic yoke, wherein the Hall current mutual inductor and the error correction current mutual inductor are arranged in parallel and a primary lead of the Hall current mutual inductor and the error correction current mutual inductor is perforated and coaxial; and primary lead through holes are formed in two ends of the shielding magnetic yoke and are coaxially arranged with the primary lead through holes of the Hall current transformer and the error correction current transformer.
Preferably, the shielding magnetic yoke is formed by compounding a ferrite layer and a silicon steel sheet layer.
Preferably, the shielding yoke is cylindrical.
Preferably, the wall thickness of the shielding yoke is not less than 5 mm.
Preferably, the difference between the secondary output current of the error correction current transformer and the output current of the hall current transformer is divided by a set proportionality coefficient, and then summed with the output current of the hall current transformer to be used as the secondary current output value of the whole direct current detection transformer.
Preferably, the scaling factor is selected according to the field interference intensity and is between 3 and 6.
Compared with the prior art, the invention is simple and ingenious, shields the interference of an external magnetic field by utilizing the magnetic yoke compatible with high and low frequency magnetic fields, can ensure that the internal mutual inductor is in a zero electric field state by adding the grounding point, and is also added with the error correction current mutual inductor which is arranged at a position closer to the outside than the Hall current mutual inductor.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Referring to fig. 1, there is shown a circuit diagram of an embodiment of the present invention. The invention relates to a direct current detection mutual inductor of a converter station, which comprises a Hall current mutual inductor 1, an error correction current mutual inductor 2 and a shielding magnetic yoke 3, wherein the Hall current mutual inductor 1 and the error correction current mutual inductor 2 are arranged in parallel, a primary lead of the Hall current mutual inductor is perforated coaxially, the shielding magnetic yoke 3 is formed by compounding a ferrite layer and a silicon steel sheet layer, is cylindrical, the wall thickness of the shielding magnetic yoke is not less than 5 mm, one section of the shielding magnetic yoke is provided with a grounding end, two ends of the shielding magnetic yoke are provided with primary lead perforations, and the shielding magnetic yoke and the primary lead perforations of the Hall current mutual. And the difference value between the secondary output current of the error correction current transformer 2 and the output current of the Hall current transformer 1 is divided by a set proportionality coefficient, and then summed with the output current of the Hall current transformer 1 to be used as the secondary current output value of the whole direct current detection transformer.
The invention utilizes the magnetic yoke which can be compatible with high and low frequency magnetic fields to shield the interference of external magnetic fields, because the electromagnetic environment of the outdoor switch field of the converter station is very complex, not only has stronger direct current electrostatic electric field and magnetic field, but also has stronger alternating current electric field and magnetic field with different frequencies, in order to shield the interference electromagnetic field around the mutual inductor, the electromagnetic field in the external environment must be shielded, the magnetic yoke adopts the compounding of silicon steel sheets and ferrite, so that the direct current magnetic field and the alternating current magnetic field can be shielded, and the arrangement of the grounding point is added, so that the zero electric field environment to the ground can be maintained in the magnetic yoke, thereby ensuring the normal operation of the Hall sensor to ensure that the mutual inductor in the internal mutual inductor is in a zero electric field state, in addition, the error correction current mutual inductor is also added, the error correction current mutual inductor is arranged at a place which is closer to the interference source of the external strong magnetic, the output value of the Hall current transformer is corrected in real time, so that a current test value which is completely free from external interference can be obtained, and the safety and the accuracy of direct current detection of the converter station are greatly improved.
The invention has the beneficial effects that: the invention is simple and ingenious, it can shield the interference of external magnetic field by using the magnetic yoke compatible with high and low frequency magnetic field, and the arrangement of the grounding point can ensure that the internal mutual inductor is in the zero electric field state, and in addition, an error correction current mutual inductor is also arranged at the place closer to the outside than the Hall current mutual inductor, and the current test value which is completely free from the external interference can be obtained by the error calculation of the current measured by the error correction current mutual inductor and the Hall current mutual inductor, the difference value of the secondary output current of the error correction current mutual inductor 2 and the output current of the Hall current mutual inductor 1 is divided by the set proportionality coefficient, and then the difference value is summed with the output current of the Hall current mutual inductor 1 to be used as the secondary current output value of the whole direct current detection mutual inductor, the general proportionality coefficient is selected according to the field interference intensity, between 3-6, the error between the current signal collected by the Hall current, therefore, the safety and the accuracy of the direct current detection of the converter station are greatly improved.
It should be noted that the above-mentioned embodiments are only for illustrating the present invention and not for limiting the present invention, and an appropriate external circuit or control part may be added to further optimize the performance thereof, etc., it is obvious that many technical features of the present invention may be interchanged or omitted, the arrangement of many elements may be changed as needed, and "a" or "an" preceding an element of the present invention does not exclude a plurality of such elements, and such changes should fall within the scope of the present invention.
Claims (4)
1. A direct current detection mutual inductor of a converter station is characterized by comprising a Hall current mutual inductor (1), an error correction current mutual inductor (2) and a shielding magnetic yoke (3), wherein the Hall current mutual inductor (1) and the error correction current mutual inductor (2) are placed in parallel, and primary leads of the Hall current mutual inductor and the error correction current mutual inductor are perforated and coaxial; primary lead through holes are formed in two ends of the shielding magnetic yoke (3) and are coaxially arranged with the primary lead through holes of the Hall current transformer (1) and the error correction current transformer (2), and the error correction current transformer is arranged at a position closer to the outside than the Hall current transformer; the shielding magnetic yoke (3) is formed by compounding a ferrite layer and a silicon steel sheet layer, so that a direct-current magnetic field and an alternating-current magnetic field can be shielded, and a zero electric field environment to the ground can be maintained in the magnetic yoke by adding the arrangement of the grounding point, so that the normal operation of the Hall sensor is ensured, and the mutual inductor in the Hall sensor can be ensured to be in a zero electric field state;
and the difference value between the secondary output current of the error correction current transformer (2) and the output current of the Hall current transformer (1) is divided by a set proportionality coefficient, and then summed with the output current of the Hall current transformer (1) to be used as the secondary current output value of the whole direct current detection transformer.
2. A converter station direct current detection transformer according to claim 1, characterized in that the shielding yoke (3) is cylindrical.
3. A converter station direct current detection transformer according to claim 1, characterized in that the wall thickness of the shielding yoke (3) is not less than 5 mm.
4. The converter station direct current detection transformer according to claim 1, characterized in that the proportionality coefficient is selected between 3-6 according to the field disturbance intensity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810097740.XA CN108281269B (en) | 2018-01-31 | 2018-01-31 | Converter station direct current detection mutual inductor |
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| CN201810097740.XA CN108281269B (en) | 2018-01-31 | 2018-01-31 | Converter station direct current detection mutual inductor |
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| CN108281269A CN108281269A (en) | 2018-07-13 |
| CN108281269B true CN108281269B (en) | 2020-06-05 |
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| CN201810097740.XA Active CN108281269B (en) | 2018-01-31 | 2018-01-31 | Converter station direct current detection mutual inductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115524520A (en) * | 2022-10-31 | 2022-12-27 | 南方电网数字电网研究院有限公司 | Magnetic shield device and current sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58147017A (en) * | 1982-02-25 | 1983-09-01 | Aisin Seiki Co Ltd | Dc current detector |
| JPH112647A (en) * | 1997-03-28 | 1999-01-06 | Sumitomo Special Metals Co Ltd | Direct current sensor and method for preventing flowing-out of direct current |
| CN201946422U (en) * | 2010-12-09 | 2011-08-24 | 平高集团有限公司 | Build-in high-voltage side electron current mutual inductor and circuit breaker |
| CN201975248U (en) * | 2010-12-09 | 2011-09-14 | 平高集团有限公司 | Low-voltage side electronic current transformer with shielding function |
| CN202058573U (en) * | 2011-04-14 | 2011-11-30 | 太仓优凯电子科技有限公司 | Zero-sequence current mutual inductor with modified shielding structure |
| CN202093120U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Compound sensor for core grounding current and partial discharge signals of transformer |
| CN204230022U (en) * | 2014-08-27 | 2015-03-25 | 常州三恒电器有限公司 | Novel two-sided magnetic screen instrument transformer |
-
2018
- 2018-01-31 CN CN201810097740.XA patent/CN108281269B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58147017A (en) * | 1982-02-25 | 1983-09-01 | Aisin Seiki Co Ltd | Dc current detector |
| JPH112647A (en) * | 1997-03-28 | 1999-01-06 | Sumitomo Special Metals Co Ltd | Direct current sensor and method for preventing flowing-out of direct current |
| CN201946422U (en) * | 2010-12-09 | 2011-08-24 | 平高集团有限公司 | Build-in high-voltage side electron current mutual inductor and circuit breaker |
| CN201975248U (en) * | 2010-12-09 | 2011-09-14 | 平高集团有限公司 | Low-voltage side electronic current transformer with shielding function |
| CN202093120U (en) * | 2010-12-31 | 2011-12-28 | 保定天威集团有限公司 | Compound sensor for core grounding current and partial discharge signals of transformer |
| CN202058573U (en) * | 2011-04-14 | 2011-11-30 | 太仓优凯电子科技有限公司 | Zero-sequence current mutual inductor with modified shielding structure |
| CN204230022U (en) * | 2014-08-27 | 2015-03-25 | 常州三恒电器有限公司 | Novel two-sided magnetic screen instrument transformer |
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