CN204333940U - An Intelligently Corrected Nonlinear Resistive Harmonic Eliminator - Google Patents
An Intelligently Corrected Nonlinear Resistive Harmonic Eliminator Download PDFInfo
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- CN204333940U CN204333940U CN201420718491.9U CN201420718491U CN204333940U CN 204333940 U CN204333940 U CN 204333940U CN 201420718491 U CN201420718491 U CN 201420718491U CN 204333940 U CN204333940 U CN 204333940U
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Abstract
本实用新型公开了智能修正非线性电阻型消谐器,包括控制器和多个非线性电阻组件单元,所述非线性电阻组件单元包括非线性电阻和与之串联的受控开关,各非线性电阻组件单元间相互并联后与设置有电流互感器的主线连接,所述受控开关和所述电流互感器与所述控制器连接。通过电流互感器监测PT中性点电流大小,并通过控制器控制受控开关的断开与闭合,调整非线性电阻组件的阻值变化,以根据铁磁谐振的实时变化情况而变化,避免发生中性点偏移、压变熔丝熔断或烧坏压变等情况,保障6-35kV压变中性点不接地电网的安全、稳定运行。
The utility model discloses an intelligently corrected nonlinear resistance type resonance eliminator, which comprises a controller and a plurality of nonlinear resistance component units. The resistance assembly units are connected in parallel to each other and connected to the main line provided with a current transformer, and the controlled switch and the current transformer are connected to the controller. Monitor the PT neutral point current through the current transformer, and control the opening and closing of the controlled switch through the controller, and adjust the resistance value of the non-linear resistance component to change according to the real-time change of ferromagnetic resonance to avoid occurrence Neutral point offset, voltage transformer fuse blown or burnt voltage transformer, etc., to ensure the safe and stable operation of the 6-35kV voltage transformer neutral point ungrounded power grid.
Description
技术领域 technical field
本实用新型属于电网安全运行辅助设备技术领域,尤其涉及一种智能修正非线性电阻型消谐器。 The utility model belongs to the technical field of power grid safety operation auxiliary equipment, in particular to an intelligently corrected nonlinear resistance type resonance eliminator.
背景技术 Background technique
目前,在6-35kV压变中性点不接地电网中,装有电磁式电压互感器(简称压变),在变电站母线上装有一次接线为YO的压变,由于压变一次线圈的X端接地,且铁芯易饱和,装有这种压变的配电网,会产生两种不利情况:一是在一定条件下,会产生铁磁谐振,谐振使得电网三相对地电压不稳定,影响正常运行,严重时使弱绝缘设备损坏造成事故。二是电网间隙性接地或接地消失时电网相对地电压出现低频自由分量,使对地有通道的YO接线压变深度饱和,一次线圈通过安培级的涌流;使压变熔丝熔断或烧坏压变。 At present, in the 6-35kV voltage change neutral point ungrounded power grid, an electromagnetic voltage transformer (referred to as a voltage change) is installed, and a voltage change with a primary connection of YO is installed on the busbar of the substation. Grounded, and the iron core is easily saturated, the distribution network equipped with such a voltage change will have two disadvantages: one is under certain conditions, ferromagnetic resonance will occur, and the resonance will make the voltage of the three phases of the power grid unstable, affecting Normal operation, in severe cases, the weak insulation equipment will be damaged and cause an accident. The second is that when the power grid is intermittently grounded or the grounding disappears, a low-frequency free component appears in the relative ground voltage of the power grid, which makes the voltage transformer of the YO connection with a channel to the ground saturated deeply, and the primary coil passes through the inrush current of the ampere level; the voltage transformer fuse is blown or burned out. Change.
为了防止压变铁磁谐振通常在压变中性点与地之间串接非线性电阻型消谐器,消除压变饱和谐振和限制涌流。如公告号为CN 201985517 U 的实用新型专利公开了一种限流消谐器,消谐器组件密封在绝缘外套内,消谐器组件上方与高压电缆连接,消谐器组件下方与固定电极连接,绝缘外套上方设有伞群,采用消谐器组件抑制电压互感器的过电压和过电流,避免了电压互感器和高压熔断器的烧毁。然而其不足之处在于:次消谐电阻理论上阻值越大,抑制PT 谐振效果越明显。随着阻值的增大,因为PT 特性的原因往往造成PT 中性点偏移而影响PT 的准确计量。同时如果系统本身存在中性点偏移的情况,加装消谐器反而会放大开口三角电压,使得系统错发接地信号。 In order to prevent voltage transformer ferromagnetic resonance, a non-linear resistance type resonance eliminator is usually connected in series between the voltage transformer neutral point and the ground to eliminate voltage transformer saturation resonance and limit inrush current. For example, the utility model patent with the notification number CN 201985517 U discloses a current-limiting resonance eliminator, the resonance eliminator assembly is sealed in an insulating jacket, the upper part of the resonance eliminator assembly is connected to a high-voltage cable, and the lower part of the resonance eliminator assembly is connected to a fixed electrode , There is an umbrella group above the insulating jacket, and the resonance eliminator component is used to suppress the overvoltage and overcurrent of the voltage transformer, avoiding the burning of the voltage transformer and high-voltage fuse. However, its disadvantage is that the larger the resistance of the sub-resonance elimination resistor in theory, the more obvious the effect of suppressing PT resonance. With the increase of the resistance value, because of the PT characteristics, the neutral point of the PT often shifts and affects the accurate measurement of the PT. At the same time, if there is a neutral point offset in the system itself, installing a resonance eliminator will instead amplify the open triangle voltage, causing the system to send a grounding signal by mistake.
实用新型内容 Utility model content
本实用新型的目的是针对上述现有技术的不足,提供一种结构简单、合理,改善铁磁谐振抵制效果,可有效避免PT 中性点偏移,避免系统误报信号的智能修正非线性电阻型消谐器。 The purpose of this utility model is to address the deficiencies of the above-mentioned prior art, to provide a simple and reasonable structure, to improve the ferromagnetic resonance resistance effect, to effectively avoid the PT neutral point offset, and to avoid the system false alarm signal intelligently corrected nonlinear resistor type harmonic eliminator.
为实现本实用新型的目的所采用的技术方案是:该智能修正非线性电阻型消谐器,包括控制器和多个非线性电阻组件单元,所述非线性电阻组件单元包括非线性电阻和与之串联的受控开关,各非线性电阻组件单元间相互并联后与设置有电流互感器的主线连接,所述受控开关和所述电流互感器与所述控制器连接。 The technical solution adopted for realizing the purpose of this utility model is: the intelligent correction nonlinear resistance resonance eliminator includes a controller and a plurality of nonlinear resistance component units, and the nonlinear resistance component units include a nonlinear resistance and a The series-connected controlled switches are connected in parallel with each other and then connected to the main line provided with current transformers, and the controlled switches and the current transformers are connected to the controller.
所述非线性电阻组件单元包括多个串联的非线性电阻。 The non-linear resistance assembly unit includes a plurality of non-linear resistances connected in series.
所述非线性电阻并联有受控开关。 The non-linear resistor is connected in parallel with a controlled switch.
所述受控开关为同步投切开关,其包括依次连接的电流互感器、嵌入式控制器和继电开关。 The controlled switch is a synchronous switching switch, which includes a current transformer, an embedded controller and a relay switch connected in sequence.
本实用新型的智能修正非线性电阻型消谐器,通过电流互感器监测PT中性点电流大小,并通过控制器控制受控开关的断开与闭合,调整非线性电阻组件的阻值变化,以根据铁磁谐振的实时变化情况而变化,避免发生中性点偏移、压变熔丝熔断或烧坏压变等情况,保障6-35kV压变中性点不接地电网的安全、稳定运行。受控开关采用同步投切开关,其嵌入式控制器通过电流互感器检测电压过零点和电流过零点,并通过控制模块控制继电开关的闭合与打开,控制更加精确,可靠性更强。本实用新型简便、实用、成本低。 The intelligently corrected non-linear resistance type resonance eliminator of the utility model monitors the current magnitude of the neutral point of the PT through the current transformer, controls the opening and closing of the controlled switch through the controller, and adjusts the resistance value change of the non-linear resistance component. To change according to the real-time changes of ferromagnetic resonance, to avoid the occurrence of neutral point shift, voltage transformer fuse blown or burnt voltage transformer, etc., to ensure the safe and stable operation of the 6-35kV voltage transformer neutral point ungrounded power grid . The controlled switch adopts a synchronous switching switch, and its embedded controller detects the voltage zero point and current zero point through the current transformer, and controls the closing and opening of the relay switch through the control module, which makes the control more accurate and more reliable. The utility model is simple, practical and low in cost.
附图说明 Description of drawings
下面结合附图对本实用新型做进一步的说明: Below in conjunction with accompanying drawing, the utility model is further described:
图1是本实用新型的电路图。 Fig. 1 is a circuit diagram of the utility model.
具体实施方式 Detailed ways
如图1所示: As shown in Figure 1:
实施例一 Embodiment one
一种该智能修正非线性电阻型消谐器,包括控制器1和多个非线性电阻组件单元A,所述非线性电阻组件单元A包括非线性电阻2和与之串联的受控开关3,各非线性电阻组件单元A间相互并联后与设置有电流互感器4的主线连接,所述受控开关3和所述电流互感器4与所述控制器1连接。所述受控开关3为同步投切开关,其包括依次连接的电流互感器、嵌入式控制器和继电开关,嵌入式控制器通过电流互感器检测电压过零点和电流过零点,并通过控制模块控制继电开关的闭合与打开。 An intelligently corrected non-linear resistance type resonance eliminator, comprising a controller 1 and a plurality of non-linear resistance component units A, the non-linear resistance component units A including a non-linear resistance 2 and a controlled switch 3 connected in series, The non-linear resistor assembly units A are connected in parallel to each other and connected to the main line provided with the current transformer 4 , and the controlled switch 3 and the current transformer 4 are connected to the controller 1 . The controlled switch 3 is a synchronous switching switch, which includes a current transformer, an embedded controller and a relay switch connected in sequence, and the embedded controller detects the voltage zero-crossing point and the current zero-crossing point through the current transformer, and controls the The module controls the closing and opening of the relay switch.
实施例二 Embodiment two
本实施例与实施例一的不同之处在于:所述非线性电阻组件单元A包括多个串联的非线性电阻2,每个非线性电阻2都并联有与所述控制器1连接的受控开关3。 The difference between this embodiment and Embodiment 1 is that the non-linear resistance component unit A includes a plurality of non-linear resistances 2 connected in series, and each non-linear resistance 2 is connected in parallel with a controlled switch 3.
运行时,控制器1通过电流互感器4监测PT中性点电流大小,并控制受控开关3的断开与闭合,调整非线性电阻组件单元的阻值变化,以根据铁磁谐振的实时变化情况而变化,避免发生中性点偏移、压变熔丝熔断或烧坏压变等情况,保障6-35kV压变中性点不接地电网的安全、稳定运行。 During operation, the controller 1 monitors the PT neutral point current through the current transformer 4, and controls the opening and closing of the controlled switch 3, and adjusts the resistance value change of the non-linear resistance component unit, so as to adapt to the real-time change of ferromagnetic resonance The situation changes, avoiding the occurrence of neutral point shift, voltage transformer fuse blown or burning voltage transformer, etc., to ensure the safe and stable operation of the 6-35kV voltage transformer neutral point ungrounded power grid.
本实用新型的技术方案并不限制于本实用新型所述的实施例的范围内。本实用新型未详尽描述的技术内容均为公知技术。 The technical solution of the utility model is not limited within the scope of the embodiments described in the utility model. The technical contents not described in detail in the utility model are all known technologies.
Claims (4)
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107317305A (en) * | 2017-06-09 | 2017-11-03 | 北京天和本安电力科技有限公司 | Suppress the method and device of transformer DC magnetic bias current based on graded resistance |
CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
CN110021920A (en) * | 2019-03-14 | 2019-07-16 | 国网新疆电力有限公司昌吉供电公司 | Active harmonic elimination resistance device and resistance setting method |
-
2014
- 2014-11-26 CN CN201420718491.9U patent/CN204333940U/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107317305A (en) * | 2017-06-09 | 2017-11-03 | 北京天和本安电力科技有限公司 | Suppress the method and device of transformer DC magnetic bias current based on graded resistance |
CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
CN108767815B (en) * | 2018-07-17 | 2024-02-02 | 云南电网有限责任公司红河供电局 | Automatic bypass resonance elimination device of electromagnetic voltage transformer |
CN110021920A (en) * | 2019-03-14 | 2019-07-16 | 国网新疆电力有限公司昌吉供电公司 | Active harmonic elimination resistance device and resistance setting method |
CN110021920B (en) * | 2019-03-14 | 2020-11-20 | 国网新疆电力有限公司昌吉供电公司 | Active harmonic elimination resistance device and resistance setting method |
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