CN109755005B - Power transformer system capable of automatically restraining negative sequence voltage - Google Patents
Power transformer system capable of automatically restraining negative sequence voltage Download PDFInfo
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- CN109755005B CN109755005B CN201910126740.2A CN201910126740A CN109755005B CN 109755005 B CN109755005 B CN 109755005B CN 201910126740 A CN201910126740 A CN 201910126740A CN 109755005 B CN109755005 B CN 109755005B
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Abstract
The invention provides a power transformer system for automatically inhibiting negative sequence voltage, which comprises a three-phase transformer, a control lever, a transmission mechanism, a servo motor and a negative sequence voltage detection control system, wherein the control lever is connected with the three-phase transformer; the three-phase transformer comprises a first iron core column, a second iron core column, a third iron core column, two iron yokes, three primary windings, three secondary main windings and three adjustable secondary negative sequence voltage suppression windings; a primary winding, a secondary main winding and an adjustable secondary negative sequence voltage suppression winding are wound on the first iron core column, the second iron core column and the third iron core column respectively in sequence; the negative sequence voltage detection control system is respectively connected with the output end of the secondary winding of the three-phase transformer and the servo motor, the servo motor is connected with the operating rod through the transmission mechanism, and the operating rod is connected with the adjustable secondary negative sequence voltage suppression winding. The power transformer system capable of automatically inhibiting the negative sequence voltage can reduce the negative sequence voltage component caused by power generation, power transmission and power distribution, reduce the loss of a power transmission line, improve the power transmission and distribution quality and ensure the safety of a power grid.
Description
Technical Field
The invention relates to the field of power transformers, in particular to a power transformer system capable of automatically restraining negative sequence voltage.
Background
Due to three-phase impedance mismatching of a three-phase generator, a transformer and a power transmission system and three-phase load unbalance caused by a single-phase motor, a single-phase heating furnace, illumination, household appliances and the like, a three-phase power system has positive sequence, negative sequence and zero sequence voltage components, wherein the positive sequence component is required by the power system, and the negative sequence and zero sequence components increase the loss of a power grid line, aggravate the vibration of the transformer and the motor, reduce the efficiency, easily cause the action of a relay protection device and influence the safe operation of the power grid. Minimizing negative and zero sequence components is therefore a long-standing major issue in electrical power engineering.
In order to reduce negative sequence and zero sequence components, three-phase alternating current motors and three-phase transformers are designed symmetrically, a low-voltage distribution system adopting a three-phase four-wire system adopts load balancing distribution as much as possible, and the principle of most relay protection devices acts based on the detection of the negative sequence and the zero sequence components. The negative sequence component accounts for a little more than the zero sequence component in the power grid.
Three-phase alternating current motors, three-phase transformers and power transmission systems adopt three-phase symmetrical design, but cannot be strictly guaranteed in processing, manufacturing, construction and use, such as local short circuit of iron cores, winding turn-to-turn short circuit, eccentricity of stator iron cores in the three-phase alternating current motors and the three-phase transformers, and unequal three-phase earth impedance in a power grid.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a power transformer system for automatically inhibiting negative sequence voltage, which can reduce the negative sequence voltage component caused by power generation, power transmission and power distribution links, reduce the loss of a power transmission line, improve the power transmission and distribution quality, reduce the false operation of a relay protection device and ensure the safety of a power grid.
In order to achieve the above object, the present invention provides a power transformer system for automatically suppressing negative sequence voltage, which comprises a three-phase transformer, a joystick, a transmission mechanism, a servo motor and a negative sequence voltage detection control system; the three-phase transformer comprises a first iron core column, a second iron core column, a third iron core column, two iron yokes, three primary windings, three secondary main windings and three adjustable secondary negative sequence voltage suppression windings; the first iron core column, the second iron core column and the third iron core column are sequentially fixed between the two iron yokes at intervals; the first iron core column, the second iron core column and the third iron core column are respectively wound with the primary winding, the secondary main winding and the adjustable secondary negative sequence voltage suppression winding in sequence, and the secondary main winding is connected with the adjustable secondary negative sequence voltage suppression winding in a reverse phase sequence in series to form a secondary winding; the negative sequence voltage detection control system is respectively connected with the output end of the secondary winding of the three-phase transformer and the servo motor, the servo motor is in transmission connection with the transmission mechanism, the transmission mechanism is connected with the operating rod, and the operating rod is connected with each adjustable secondary negative sequence voltage suppression winding.
Preferably, each of the adjustable secondary negative sequence voltage suppression windings comprises a secondary negative sequence voltage suppression winding and an adjusting brush, and the adjusting brush is connected with the secondary negative sequence voltage suppression winding; the primary windings are connected in a star shape or a triangular shape; a second end of the secondary main winding on the first core leg is connected to a first end of the secondary negative-sequence voltage-suppressing winding on the first core leg; a second end of the secondary main winding on the second core leg is connected to a first end of the secondary negative-sequence voltage suppression winding on the third core leg; a second end of the secondary main winding on the third core leg is connected to a first end of the secondary negative-sequence voltage suppression winding on the second core leg; one end of the negative sequence voltage detection control system is connected with the output end of the secondary winding of the three-phase transformer, and the other end of the negative sequence voltage detection control system is connected with the servo motor; the servo motor is connected with the operating rod through a transmission mechanism, and the operating rod is in transmission connection with the sliding sheet of each adjusting electric brush.
Preferably, the negative sequence voltage detection control system comprises a comparator, a negative sequence voltage detection circuit, a reference voltage input source and an amplification driving circuit; the input end of the negative sequence voltage detection circuit is connected with the output end of the secondary winding of the three-phase transformer, the output end of the negative sequence voltage detection circuit and the reference voltage input source are respectively connected with the two input ends of the comparator, the output end of the comparator is connected with the amplification driving circuit, and the amplification driving circuit is connected with the servo motor.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the cooperation of the secondary negative sequence voltage suppression winding, the operating rod 2, the transmission mechanism 3, the servo motor 4 and the negative sequence voltage detection control system 5 can be adjusted, so that the negative sequence voltage in a power grid can be automatically reduced, the line loss is reduced, and the high-efficiency, low-noise, reliable and long-life operation of electric appliances is ensured; and the structure is simple, the price is low, the technical conditions are mature, and the device is suitable for large-area popularization and application.
Drawings
FIG. 1 is a schematic diagram of a power transformer system for automatically suppressing negative sequence voltage according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-phase transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a negative sequence voltage detection control system according to an embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings 1-3, and will make the functions and features of the invention better understood.
Referring to fig. 1 and fig. 2, a power transformer system for automatically suppressing negative sequence voltage according to an embodiment of the present invention includes a three-phase transformer 1, a joystick 2, a transmission mechanism 3, a servo motor 4, and a negative sequence voltage detection control system 5; the three-phase transformer 1 comprises a first iron core column 11, a second iron core column 12, a third iron core column 13, two iron yokes 14, three primary windings 15, three secondary main windings 16 and three adjustable secondary negative sequence voltage suppression windings 17; the first iron core limb 11, the second iron core limb 12 and the third iron core limb 13 are sequentially fixed between two iron yokes 14 at intervals; a primary winding 15, a secondary main winding 16 and an adjustable secondary negative-sequence voltage suppression winding 17 are sequentially wound on the first iron core column 11, the second iron core column 12 and the third iron core column 13 respectively; the secondary main winding 16 is connected with the adjustable secondary negative-sequence voltage suppression winding 17 with the reverse phase sequence in series to form a secondary winding; the negative sequence voltage detection control system 5 is respectively connected with the output end 18 of the secondary winding of the three-phase transformer 1 and the servo motor 4, the servo motor 4 is in transmission connection with the transmission mechanism 3, the transmission mechanism 3 is connected with the operating rod 2, and the operating rod 2 is connected with each adjustable secondary negative sequence voltage suppression winding 17. In this embodiment, the three-phase transformer 1 is a step-up transformer of Yd 11.
Each adjustable secondary negative sequence voltage suppression winding 17 comprises a secondary negative sequence voltage suppression winding 171 and an adjusting brush 172, and the adjusting brush 172 is connected with the secondary negative sequence voltage suppression winding 171; the three primary windings 15 are connected in star or triangle as required; the second end of the secondary main winding 16 on the first core leg 11 is connected to the first end of the secondary negative-sequence voltage-suppressing winding 171 on the first core leg 11; the second end of the secondary main winding 16 on the second core leg 12 is connected to the first end of the secondary negative-sequence voltage suppression winding 171 on the third core leg 13; a second end of the secondary main winding 16 on the third core leg 13 is connected to a first end of the secondary negative-sequence voltage suppression winding 171 on the second core leg 12; one end of the negative sequence voltage detection control system 5 is connected with the output end 18 of the secondary winding of the three-phase transformer 1 to detect the three negative sequence voltages output by the three-phase transformer 1, and the other end is connected with the servo motor 4; the servo motor 4 is connected with the operating rod 2 through the transmission mechanism 3, and the operating rod 2 is in transmission connection with the sliding sheet of each adjusting electric brush 172.
The position of the regulating brush 172 is regulated by the joystick 2 and determines the number of series turns of the secondary negative-sequence voltage suppression winding 171.
Wherein the secondary main winding 16 comprises a first secondary main winding A1X, second secondary main winding B1Y and a third secondary main winding C1Z; the secondary negative sequence voltage suppression winding 171 includes a first secondary negative sequence voltage suppression winding AA2A second secondary negative sequence voltage suppression winding BB2And a third secondary negative sequence voltage suppression winding CC2。
First secondary main winding A1X and a first secondary negative sequence voltage suppression winding AA2The first iron core column 11 is connected in series in the forward direction to form an A-phase high-voltage winding; second secondary main winding B1Y and second quadratic negative sequence voltage suppression winding BB2And a third secondary main winding C1Z and third secondary negative sequence voltage suppression winding CC2After the iron core columns are exchanged, the iron core columns are respectively connected in series in the forward direction to form a B-phase high-voltage winding and a C-phase high-voltage winding.
Referring to fig. 1 to 3, the negative sequence voltage detection control system 5 includes a comparator 51, a negative sequence voltage detection circuit 52, a reference voltage input source 53 and an amplification driving circuit 54; the input end of the negative sequence voltage detection circuit 52 is connected with the output end 18 of the secondary winding of the three-phase transformer 1, the output end of the negative sequence voltage detection circuit 52 and the reference voltage input source 53 are respectively connected with two input ends of the comparator 51, the output end of the comparator 51 is connected with the amplification driving circuit 54, and the amplification driving circuit 54 is connected with the servo motor 4.
The negative sequence voltage detection control system 5 detects the negative sequence voltage of the output end 18 of the secondary winding of the negative sequence three-phase transformer 1, generates a control signal, and drives the servo motor 4, and the servo motor 4 drives the adjusting electric brush 172 to move through the transmission mechanism 3 and the operating rod 2.
According to the power transformer system capable of automatically inhibiting the negative sequence voltage, when the negative sequence voltage amplitude detected by the negative sequence voltage detection circuit 52 is larger than or equal to the reference signal voltage amplitude of the reference voltage input source 53, the comparator 51 outputs a high level signal, the high level signal is amplified by the amplification driving circuit 54 and then drives the servo motor 4 to act, the servo motor 4 adjusts the position of the adjusting brush 172 through the operating rod 2 and moves towards the direction of reducing the output negative sequence voltage, and the negative sequence voltage is reduced until the detected negative sequence voltage amplitude is smaller than the reference signal.
When the negative sequence voltage amplitude is smaller than the reference signal, the comparator 51 outputs a low level, the servo motor 4 does not act, the position of the regulating brush 172 is unchanged, and the three-phase transformer 1 keeps normal operation.
The power transformer system capable of automatically inhibiting the negative sequence voltage is characterized in that an adjustable secondary negative sequence voltage inhibition winding 17 is arranged on the secondary side of a common power transformer, and the negative sequence voltage is detected and inhibited on line through a negative sequence voltage detection control system 5; the negative sequence voltage in the power grid is directly inhibited on line, so that the power supply quality of the power grid is ensured; compared with a device with a negative sequence voltage detection relay protection function, the device can ensure the continuous and uninterrupted operation of a power grid; the voltage detection and current detection technical conditions are mature, and the method is suitable for large-area popularization and application; compared with the existing secondary main winding, the adjustable secondary negative sequence voltage suppression winding 17 has the advantages of fewer turns, simple device manufacturing and low price.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (1)
1. A power transformer system for automatically inhibiting negative sequence voltage is characterized by comprising a three-phase transformer, an operating rod, a transmission mechanism, a servo motor and a negative sequence voltage detection control system; the three-phase transformer comprises a first iron core column, a second iron core column, a third iron core column, two iron yokes, three primary windings, three secondary main windings and three adjustable secondary negative sequence voltage suppression windings; the first iron core column, the second iron core column and the third iron core column are sequentially fixed between the two iron yokes at intervals; the first iron core column, the second iron core column and the third iron core column are respectively wound with the primary winding, the secondary main winding and the adjustable secondary negative sequence voltage suppression winding in sequence, and the secondary main winding is connected with the adjustable secondary negative sequence voltage suppression winding in a reverse phase sequence in series to form a secondary winding; the negative sequence voltage detection control system is respectively connected with the output end of the secondary winding of the three-phase transformer and the servo motor, the servo motor is in transmission connection with the transmission mechanism, the transmission mechanism is connected with the operating lever, and the operating lever is connected with each adjustable secondary negative sequence voltage suppression winding;
each adjustable secondary negative sequence voltage suppression winding comprises a secondary negative sequence voltage suppression winding and an adjusting electric brush, and the adjusting electric brush is connected with the secondary negative sequence voltage suppression winding; the primary windings are connected in a star shape or a triangular shape; a second end of the secondary main winding on the first core leg is connected to a first end of the secondary negative-sequence voltage-suppressing winding on the first core leg; a second end of the secondary main winding on the second core leg is connected to a first end of the secondary negative-sequence voltage suppression winding on the third core leg; a second end of the secondary main winding on the third core leg is connected to a first end of the secondary negative-sequence voltage suppression winding on the second core leg; one end of the negative sequence voltage detection control system is connected with the output end of the secondary winding of the three-phase transformer, and the other end of the negative sequence voltage detection control system is connected with the servo motor; the servo motor is connected with the operating lever through a transmission mechanism, and the operating lever is in transmission connection with sliding sheets of the adjusting electric brushes;
the negative sequence voltage detection control system comprises a comparator, a negative sequence voltage detection circuit, a reference voltage input source and an amplification driving circuit; the input end of the negative sequence voltage detection circuit is connected with the output end of the secondary winding of the three-phase transformer, the output end of the negative sequence voltage detection circuit and the reference voltage input source are respectively connected with the two input ends of the comparator, the output end of the comparator is connected with the amplification driving circuit, and the amplification driving circuit is connected with the servo motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910126740.2A CN109755005B (en) | 2019-02-20 | 2019-02-20 | Power transformer system capable of automatically restraining negative sequence voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910126740.2A CN109755005B (en) | 2019-02-20 | 2019-02-20 | Power transformer system capable of automatically restraining negative sequence voltage |
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| CN109755005A CN109755005A (en) | 2019-05-14 |
| CN109755005B true CN109755005B (en) | 2020-09-01 |
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| CN112820524A (en) * | 2021-02-04 | 2021-05-18 | 东莞南方半导体科技有限公司 | Multi-phase transformer and rectifier system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU760208A1 (en) * | 1977-12-05 | 1980-08-30 | Valerij Z Vinnik | Three-phase converting transformer |
| CN102723833A (en) * | 2012-06-21 | 2012-10-10 | 山东电力集团公司电力科学研究院 | Three-phase induction motor with unbalanced voltage compensation function |
| CN202977126U (en) * | 2012-11-09 | 2013-06-05 | 浙江科润电力设备有限公司 | Power transformer winding structure for eliminating harmonic wave |
| CN203643878U (en) * | 2013-10-24 | 2014-06-11 | 上海电机学院 | Voltage-stabilizing transformer capable of adjusting output voltage automatically |
| CN205140701U (en) * | 2015-10-21 | 2016-04-06 | 黄智达 | A tortuous transformer for low voltage network |
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2019
- 2019-02-20 CN CN201910126740.2A patent/CN109755005B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU760208A1 (en) * | 1977-12-05 | 1980-08-30 | Valerij Z Vinnik | Three-phase converting transformer |
| CN102723833A (en) * | 2012-06-21 | 2012-10-10 | 山东电力集团公司电力科学研究院 | Three-phase induction motor with unbalanced voltage compensation function |
| CN202977126U (en) * | 2012-11-09 | 2013-06-05 | 浙江科润电力设备有限公司 | Power transformer winding structure for eliminating harmonic wave |
| CN203643878U (en) * | 2013-10-24 | 2014-06-11 | 上海电机学院 | Voltage-stabilizing transformer capable of adjusting output voltage automatically |
| CN205140701U (en) * | 2015-10-21 | 2016-04-06 | 黄智达 | A tortuous transformer for low voltage network |
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