CN103855704A - Primary and secondary combined resonance elimination device - Google Patents
Primary and secondary combined resonance elimination device Download PDFInfo
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- CN103855704A CN103855704A CN201410118885.5A CN201410118885A CN103855704A CN 103855704 A CN103855704 A CN 103855704A CN 201410118885 A CN201410118885 A CN 201410118885A CN 103855704 A CN103855704 A CN 103855704A
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Abstract
The invention discloses a primary and secondary combined resonance elimination device. Most of the power systems in China adopt a neutral point ineffective grounding mode; damage to electrical equipment and large-area power failure accidents are easily caused by the common non-linear resonance of the grounding mode. The device for eliminating the resonance by combining primary resonance elimination and secondary resonance elimination comprises a core control unit, a signal acquisition unit, a primary resonance elimination unit and a secondary resonance elimination unit. When a system is resonant, the core control unit firstly controls the secondary resonance elimination unit to operate; after the resonance elimination operation is finished, the core control unit scans the signal acquisition unit to detect whether the resonance is completely eliminated; if the resonance cannot be completely eliminated within certain time, the primary resonance elimination unit is started, namely a pressure limiter is used for eliminating the residual resonance energy. Due to the functional structure, the rationality, the thoroughness and the safety of the resonance elimination can be improved.
Description
Technical field
A kind of harmonic elimination apparatus of a secondary phase combination, the technology of the resonance that the neutral non-effective grounding mode in elimination electric power system that relates to produces, specifically in the situation that secondary harmonic elimination cannot thoroughly be eliminated resonance, carrying out a harmonic elimination one time, is two kinds of harmonic elimination apparatus that harmonic elimination mode complements one another again.
background technology
The electric power system of China adopts neutral non-effective grounding mode mostly, this earthing mode has higher power supply reliability, but nonlinear resonance is more common, not only amplitude is high for it, and energy is very large, and can spread all over whole electrical network, destructiveness is very large, once occur, often cause damage and the large-area power outage of electric equipment.
Eliminate at present the most frequently used method of resonance and mainly contain two kinds: the one, secondary harmonic elimination, it is short time short circuit voltage transformer secondary opening winding, by consuming resonant energy, thereby make the disappearance that decays gradually of resonance intensity, the method is simple, but be sometimes difficult to thoroughly eliminate resonance, if phylogenetic resonance is low-frequency resonant, harmonic elimination difficulty is larger, two is harmonic elimination resistance (linearity or nonlinear resistance) of connecting between over the ground at a neutral point of voltage transformer, object is to increase the reactance that zero sequence is returned, zero-sequence current is carried out to damping, although the method can be protected voltage transformer, but the certainty of measurement on voltage transformer has impact, when another External System generation single phase ground fault, resonance eliminator is due to self finite capacity, usually can occur self to burn fault, the resonance current particularly producing when system is when larger, on resonance eliminator, can produce very high voltage, the insulation of voltage transformer neutral point is formed and threatened.
Summary of the invention
The present invention is directed to the weak point existing in above-mentioned prior art, provide a kind of mode that harmonic elimination is combined with secondary harmonic elimination to eliminate the harmonic elimination apparatus of resonance, to improve reasonability, completeness and the fail safe of harmonic elimination.Its structural scheme is as follows:
A kind of harmonic elimination apparatus of a secondary phase combination.Comprise key control unit, signal gathering unit, harmonic elimination unit and secondary harmonic elimination unit, it is characterized in that: one end of signal gathering unit is connected with key control unit, the other end is directly connected on voltage transformer secondary side open delta place by wire, and key control unit is connected with the driver element of harmonic elimination and secondary harmonic elimination by photoelectricity barrier assembly.
(1) core that described key control unit is whole device, formed by single-chip microcomputer and Digital Logical Circuits, Main Function is that signal gathering unit is scanned, from signal gathering unit Real-time Obtaining open delta voltage signal and the running status of system is analyzed to judgement, drive harmonic elimination and the action of secondary harmonic elimination unit;
(2) a described harmonic elimination unit is composed in series by vacuum switch and voltage limiter, and voltage limiter is not long-term connecting system, but accesses between neutral point and ground by vacuum switch.The in the situation that of only cannot thoroughly eliminating resonance in described secondary harmonic elimination unit, just start vacuum switch and drop into voltage limiter.
(3) described secondary harmonic elimination unit forms with harmonic elimination resistance by controllable silicon is logical.Controllable silicon is in parallel with harmonic elimination resistance is connected to voltage transformer secondary side open delta place by wire, is state in parallel with signal gathering unit.In the time of system generation resonance, first key control unit controls the action of secondary harmonic elimination unit, completes after harmonic elimination action, and whether sweep signal collecting unit again, detect resonance and eliminate completely.If cannot eliminate within a certain period of time resonance completely, start harmonic elimination unit one time, drop into voltage limiter to eliminate remaining resonant energy.
Beneficial effect of the present invention:
Due to harmonic elimination process is divided into twice, the present invention combines the advantage of harmonic elimination and secondary harmonic elimination, overcome the deficiency of two kinds of harmonic elimination modes, both the sound resonance of having eliminated, guarantee again the certainty of measurement of voltage transformer, and self burnout failure of having avoided resonance eliminator to occur due to self finite capacity.
Accompanying drawing explanation
Fig. 1 is the structural representation of the harmonic elimination apparatus of a secondary phase combination
In figure: 1, key control unit; 2, signal gathering unit; 3, a harmonic elimination unit; 4, secondary harmonic elimination unit, 5 vacuum contactors; 6, voltage limiter.
Embodiment
Referring to Fig. 1, the harmonic elimination apparatus of a secondary phase combination, comprises key control unit, signal gathering unit, harmonic elimination unit and secondary harmonic elimination unit.
Described key control unit is connected with signal gathering unit, is connected to voltage transformer secondary side open delta by signal gathering unit, Real-time Collection open delta voltage, and carry out AD conversion, and analyze judgement by described key control unit.
Described secondary harmonic elimination unit is connected directly to secondary side neutral point, and in the time of the raw resonance of systems approach, first described key control unit drives described secondary harmonic elimination unit action (short time is conducting controllable silicon repeatedly, short circuit voltage transformer secondary opening winding).After action certain time, decontrol controllable silicon, and voltage to neutral gathers judgement again, if resonance disappears not yet, is carrying out harmonic elimination one time.
A described harmonic elimination unit is composed in series by vacuum switch and voltage limiter, and upper end is connected to neutral point of voltage transformer, the direct ground connection in lower end.In the time that secondary harmonic elimination cannot be eliminated resonance thoroughly, described key control unit just drives described harmonic elimination unit action (closed vacuum contactor, drops into voltage limiter in the middle of electrical network) assurance resonance thoroughly to eliminate.
Described key control unit is the core of whole device, the signal of on the one hand described signal gathering unit being sent here carries out analyzing and processing and judgement, also to drive in addition a described harmonic elimination unit and the action of described secondary harmonic elimination unit, the information such as the action situation of residual voltage, system running state and two harmonic elimination unit are carried out to record, and communication is to upper managing computer simultaneously.Key control unit is realized by Digital Logical Circuits and single-chip microcomputer.
Claims (1)
1. the harmonic elimination apparatus of secondary phase combination once, comprise key control unit, signal gathering unit, harmonic elimination unit and secondary harmonic elimination unit, it is characterized in that, one end of signal gathering unit is connected with key control unit, the other end is directly connected on voltage transformer secondary side open delta place by wire, and key control unit is connected with the driver element of harmonic elimination and secondary harmonic elimination by photoelectricity barrier assembly; Above-mentioned each unit also has following characteristics:
(1) core that described key control unit is whole device, formed by single-chip microcomputer and Digital Logical Circuits, Main Function is that signal gathering unit is scanned, from signal gathering unit Real-time Obtaining open delta voltage signal and the running status of system is analyzed to judgement, drive harmonic elimination and the action of secondary harmonic elimination unit;
(2) a described harmonic elimination unit is composed in series by vacuum switch and voltage limiter, and voltage limiter is not long-term connecting system, but accesses between neutral point and ground by vacuum switch; The in the situation that of only cannot thoroughly eliminating resonance in described secondary harmonic elimination unit, just start vacuum switch and drop into voltage limiter;
(3) described secondary harmonic elimination unit is made up of controllable silicon and harmonic elimination resistance, and controllable silicon is in parallel with harmonic elimination resistance is connected to voltage transformer secondary side open delta place by wire, is state in parallel with signal gathering unit; In the time of system generation resonance, first key control unit controls the action of secondary harmonic elimination unit, completes after harmonic elimination action, and whether sweep signal collecting unit again, detect resonance and eliminate completely; If cannot eliminate within a certain period of time resonance completely, start harmonic elimination unit one time, drop into voltage limiter to eliminate remaining resonant energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410118885.5A CN103855704B (en) | 2014-03-28 | The harmonic elimination apparatus that an a kind of secondary phase combines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410118885.5A CN103855704B (en) | 2014-03-28 | The harmonic elimination apparatus that an a kind of secondary phase combines |
Publications (2)
| Publication Number | Publication Date |
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| CN103855704A true CN103855704A (en) | 2014-06-11 |
| CN103855704B CN103855704B (en) | 2016-11-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208024A (en) * | 2016-09-13 | 2016-12-07 | 国家电网公司 | A kind of elimination resonance overvoltage device being based on the monitoring quick element state of stream |
| CN106486997A (en) * | 2016-10-26 | 2017-03-08 | 安徽巨森电器有限公司 | A kind of Intelligent resonance suppression device |
| CN109617095A (en) * | 2018-12-21 | 2019-04-12 | 云南电网有限责任公司西双版纳供电局 | A kind of novel harmonic elimination apparatus |
| CN112564042A (en) * | 2020-11-17 | 2021-03-26 | 国网天津市电力公司 | Resonance elimination method for power grid |
| CN113097986A (en) * | 2021-03-31 | 2021-07-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
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| US20020145842A1 (en) * | 2001-04-06 | 2002-10-10 | Kumar Ajith K. | Method for detecting electrical faulty conditions in power devices of a propulsion system |
| CN2847639Y (en) * | 2005-11-11 | 2006-12-13 | 李彦 | Arc extinction and resonance extinction protector in nuetral point non-effective earthing system |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN203119619U (en) * | 2012-10-12 | 2013-08-07 | 姚如昕 | Microcomputer harmonic elimination device |
| CN203747411U (en) * | 2014-03-28 | 2014-07-30 | 安徽巨森电器有限公司 | Resonance elimination device with primary resonance elimination and secondary resonance elimination being combined |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020145842A1 (en) * | 2001-04-06 | 2002-10-10 | Kumar Ajith K. | Method for detecting electrical faulty conditions in power devices of a propulsion system |
| CN2847639Y (en) * | 2005-11-11 | 2006-12-13 | 李彦 | Arc extinction and resonance extinction protector in nuetral point non-effective earthing system |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN203119619U (en) * | 2012-10-12 | 2013-08-07 | 姚如昕 | Microcomputer harmonic elimination device |
| CN203747411U (en) * | 2014-03-28 | 2014-07-30 | 安徽巨森电器有限公司 | Resonance elimination device with primary resonance elimination and secondary resonance elimination being combined |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208024A (en) * | 2016-09-13 | 2016-12-07 | 国家电网公司 | A kind of elimination resonance overvoltage device being based on the monitoring quick element state of stream |
| CN106208024B (en) * | 2016-09-13 | 2017-12-26 | 国家电网公司 | A kind of elimination resonance overvoltage device for being based on monitoring and flowing quick element state |
| CN106486997A (en) * | 2016-10-26 | 2017-03-08 | 安徽巨森电器有限公司 | A kind of Intelligent resonance suppression device |
| CN109617095A (en) * | 2018-12-21 | 2019-04-12 | 云南电网有限责任公司西双版纳供电局 | A kind of novel harmonic elimination apparatus |
| CN112564042A (en) * | 2020-11-17 | 2021-03-26 | 国网天津市电力公司 | Resonance elimination method for power grid |
| CN113097986A (en) * | 2021-03-31 | 2021-07-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
| CN113097986B (en) * | 2021-03-31 | 2022-10-18 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
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