CN101711447A - Zero sequence current generator - Google Patents
Zero sequence current generator Download PDFInfo
- Publication number
- CN101711447A CN101711447A CN200780052774.7A CN200780052774A CN101711447A CN 101711447 A CN101711447 A CN 101711447A CN 200780052774 A CN200780052774 A CN 200780052774A CN 101711447 A CN101711447 A CN 101711447A
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- Prior art keywords
- zero sequence
- compartment
- reactor
- voltage
- bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
A facility for an identification of an earth-fault feeder in networks with an isolated neutral comprises filters of zero sequence currents, which are included in a circuit of each outgoing filter, and the filter of the zero sequence voltage, which is connected to busbars. A generator of zero sequence current is connected to busbars through a switch, which is controlled by means of control and operation module, which is connected to the zero sequence voltage filter and which accomplishes temporarily closing the above- mentioned switch, when zero sequence voltage exceeds its definite level. The control and operation module comprises a time delay and provides with an identification of one phase-to-ground fault with respect to the zero sequence. The zero sequence current generator comprises a reactor with three-phase non-saturable iron circuit and with windings, which are connected in star with a grounded neutral. To the control and operation module there is connected a drive in the form of series-connected selector and vacuum switching module with three vacuum switches.
Description
Technical field
The present invention relates to the electronic engineering when needs are distinguished the earth fault protection that has in the network of isolating neutral point.
Background technology
In these networks, identification fault ultramagnifier is the work of a difficulty, when particularly high at fault earthing resistance and ultramagnifier seldom is powered by power transformer.The varistructure of network is brought extra difficulty.
If the fault ultramagnifier is not pointed out in earth fault protection, the ultramagnifier that then is connected to the bus part cuts off successively, and points out the fault ultramagnifier when the null sequence loss of voltage.This method is too lasting, and cause can not energy supply expensive.
Prior art (RU 2157038 C1) proposed a kind ofly to comprise that the short time is connected to the equipment of the three-phase high-voltage resistance device group of bus-bar system.These resistance provide effective current to pass through earth point.As a result, Zero sequence current is a capacity type in good (healthy) ultramagnifier, and still Zero sequence current has derived components is significantly arranged in the fault ultramagnifier.Zero sequence current of measuring for different ultramagnifiers and the phase difference between the null sequence voltage illustrate the fault ultramagnifier, and three-phase resistance device group can be cut off then.
The shortcoming of foregoing invention has been to use resistor power ground, and this resistor needs specially designed relay to protect, and the algorithm that foregoing invention is used is too complicated, is difficult to study the communication between the signal that the current transformer of different ultramagnifiers produces.
Moskovsky Zavod Electroschit (Moscow, Russia) other inventions that propose comprise grounding transformer, and it is installed in the metal enclosed cupboard and by K-104M switching device (with reference to the printed matter of " Moskovsky Zavod Electroschit ") and is connected to bus.Grounding transformer is other electric power of 63kVA level, and the high pressure winding is the Y-connection by effective Y-connection point, and the low pressure winding is that triangle connects.The Y-connection of high pressure winding o'clock is the resistance-grounded system of 100 ohm or 150 ohm (being respectively applied for 7.2kV or other voltage of 12kV level) by one group of effective resistance.
Not that best design and operation makes the grounding transformer size big and heavy.Make the necessity of Y-connection point ground connection need high-power resistor in the resistor group by active pull-up.In addition, transformer and switching device are installed in two independently in the cupboard.Use jumper cable with these cupboard interconnection.The shortcoming of this scheme is that overall dimension is big, cost is high, poor reliability.
The objective of the invention is to produce by the effective and compact configuration of three-phase non-saturable reactor realization, reliably Zero sequence current.This electric current is enough to discern the fault ultramagnifier.Advantage of the present invention be Zero sequence current generator simplicity of design, in light weight, size is little, cost is low.The latter is the part of Russian Federation's patent (2217851) ETALON-type switchgear (ETALON-type switching device).
The technical problem to be solved in the present invention is to make Zero sequence current generator efficiently, and the supply of expansion Zero sequence current generator.
The technique effect that the present invention produces comprises: designs simplification, speed and reliability reinforcement, overall dimension and weight are dwindled, best configuration safety, maintenance safety improve.
Summary of the invention
The present invention relates to electronic engineering, that is, in isolating the neutral point system, provide the equipment of selectivity earth fault protection.
According to the present invention, when control device detects null sequence voltage, produce Zero sequence current effectively by the three-phase three core non-saturable reactors that temporarily are connected to bus.The summation of Zero sequence current and the impedance of null sequence earth fault is inversely proportional to.The tripod magnetic core of reactor (three-leg core) is designed to not produce the null sequence magnetic flux.Thereby the null sequence impedance is only determined by the leakage inductive reactance of winding, and the null sequence impedance is inessential.After earth fault protection selection fault output ultramagnifier, the three-phase non-saturable reactor is connected with the bus disconnection.Until after failure cleaning and null sequence voltage makes zero, switch module is closure again.
Essence of the present invention is a kind of equipment that is used for discerning the earth fault ultramagnifier that has the network of isolating neutral point; comprise Zero sequence current filter that is arranged in each output ultramagnifier and the null sequence voltage filter device that is connected to bus; produce Zero sequence current; and be connected to bus by often opening the threephase switch module; the described protected relay of threephase switch module of often opening is controlled; described protection relay is connected to described null sequence voltage filter device; when null sequence voltage surpasses certain level; the temporary transient closed above-mentioned switch module of described null sequence voltage filter device; and by the time delay in the described protection relay; described null sequence voltage filter device difference; produce Zero sequence current by the three-phase non-saturable reactor; described three-phase non-saturable reactor has the winding of one group of Y-connection, and the winding of described Y-connection has the Y-connection point of ground connection.
Therefore, above-mentioned Zero sequence current and voltage filter device are connected to the specific protection relay to null sequence active power sensitivity.
In addition, the Zero sequence current generator that has in the three-phase network of isolating neutral point comprises reactor, described reactor has unsaturated magnetic circuit of three nodes and winding, connect with star fashion, have grounded neutral, and be switched to monitoring and control module by the Chang Kaimo piece high voltage that driver provides, by being connected with three vacuum interrupters, selector and vacuum switch module carry out (execute) successively, selector is by three armature arms, static contact by three isolation, carry out by three ground connection assemblies and by three assemblies, selector is connected with bus, switch module is carried out by three assemblies, be connected with armature arm and three assemblies of selector, be connected with the winding of reactor, therefore monitoring is carried out by the chance of identification form circuitry phase closed ground connection on null sequence voltage with control module.
In addition, provide unified body by shell, described shell has mould bus compartment, and set gradually downwards from the top by low-voltage compartment, high pressure compartment and reactor compartment, therefore in being arranged at the mould bus compartment of high pressure compartment back, the ampere wires and the connector of burying device, mould bus substantially is set, the signal system and the indicating device body of Detection ﹠ Controling module and subsequent installation are set in low-voltage compartment, switch module and selector are set in the high pressure compartment, with its interlocking, at the conductor of reactor-reactor compartment and connection.
In addition, each compartment provides overvoltage decline valve.
In addition, described high pressure compartment is carried out by the window of high-strength transparence Merlon, and provides the simulator of operating machine, and it is set to have an opportunity to check by the simulator of operating machine by window.
Described design of transformer is simply compact, cost is low.High-pressure modular, reactor and control device are integrated in the single cupboard.The function of high-pressure modular is enough for the security maintenance of switching manipulation and reactor.In addition, electric current I a, Ib and the Ic (referring to Fig. 1) of the phase winding by reactor are transient currents, and induction cap (inductive hat) prevented the overheated of winding, thereby the high reliability of equipment is provided.
Description of drawings
Fig. 1 is the one-line diagram of Zero sequence current generator.
The movable contact of selector can be placed on earthing position or isolated location or bonding station manually.Selector standing (permanently) is for being in bonding station, and switching mode is cut-out.
As shown in Figure 2, it is the cutaway view that is mounted with the cupboard of generator, and this cupboard comprises high-pressure modular compartment 1, bus compartment 2, reactor compartment 3 (that is power compartment) and low-voltage compartment 4.
The top 8 of switch module 5, selector 6, selector driver 7, sleeve pipe insulator and the upper terminal 9 of central conductor are placed in the high-pressure modular compartment.
The bottom 10 of sleeve pipe insulator, lower terminal 11, flexible interconnect lead 12 and three-phase non-saturable reactor 13 are placed in the reactor compartment.On the horizontal guide rail that is provided with before and after reactor is fastened on.
The supports insulative device 14 and the bus tie that embed the bus in the solid insulation are arranged in the bus compartment.
Above-mentioned all power compartments all are equipped with safety valve, and safety valve is used for malleation and discharges, and the durability of cupboard with respect to internal arc is provided.
The overall schematic of cupboard when Fig. 3 illustrates and observes from the front side.The high pressure compartment has an inspection that covers the clear polycarbonate thin slice, and as seen it make selector and analog circuit figure.The position of the contact of the element 1 of analog circuit figure and element 2 difference display switch modules and selector.Be used to prevent that the interlocking lever 3 of personnel's misoperation equally can be approaching from front panel.
Embodiment
When earth fault took place, control device was by this fault of null sequence voltage identification.After program control time delay (this is that the contingent self-extinction of arc of phase earth fault is necessary), the switch module closure.The three-phase non-saturable reactor that is connected to bus enters the imbalance operation that three core designing institutes by reactor cause, and depends on the neutral point (neutral) of the Zero sequence current In (referring to Fig. 1) of phase voltage and earth fault impedance by reactor.
Reactor is designed to Zero sequence current In to be restricted to the level that is lower than 40A, and the electric current of this level can not cooperate (compound) fault on the one hand, on the other hand, is enough to carry out effective earth fault protection.
Be enough to determine that fault is left the time of ultramagnifier through one section after, control device is opened switch module, thereby three-phase reactor is disconnected from bus.
Starting point (origin) at neutral point place single phase ground fault has Zero sequence current, and also has in phase conductor (its formation).The validity (on the reflector of null sequence voltage) of the damage of the null sequence voltage of monitoring and control module (for example passing through timing unit) identification neutral point does not still allow to set up and disconnects impaired (injured phase) mutually.After through the self-extinction of arc requisite program control duration of institute that single phase ground fault is provided, monitoring produces the high-tension insertion of (yield) module with control module.Therefore the contact of the vacuum interrupter of switch module forms, and the contact of selector is installed in by Mechanical Driven in the situation (standing) of link of the switch module that has mould bus (modular bus).Monitoring and this damage of control module at the starting point of single phase ground fault identification null sequence voltage are based upon the cross section part that filter among transformer case KRU of " ETALON " series is switched to (hook up to) mould bus.After through self-extinction of arc more requisite duration of institute that single phase ground fault is provided, monitoring and control module produce the insertion of switch module, and the voltage of mould bus is switched to three-phase reactor.Therefore three-phase three node non-saturable reactors enter asymmetric operating mode, and form electric current I n at its neutral point, and electric current I n depends on the resistance of network neutral point voltage, affected area and the inductive resistance (induced drag) of eliminating the reactor winding.
Extract the design data of reactor, therefore constitute the development that the current amplitude Jn that is not less than 40A does not alleviate the accident in the affected area on the one hand, the startup of its sufficient to guarantee Zero sequence current protector on the other hand.Go up the operation that continues for each tie point (association) of connecting the mould bus portion, set up the null sequence filter.
The voltage of mould bus and three-phase non-saturable reactor (for example three node hearts) have connection.Therefore, finally enter asymmetric operating mode, and form indicator current Jn at its neutral point, its amplitude reaches 40A, and depends on the voltage of network neutral point and the resistance in the affected area.Generator (electric current that adding is flow through) forms the Zero sequence current in short-term of representing an electric current Jn part in impaired link (impaired phase).Its amplitude limits in the design data of reactor, and proportional with the summation and the resistance in the affected area of the null sequence resistance of three-phase reactor.In three node magnetic circuits, null sequence magnetic flux, and minimized reactor null sequence do not indicate, because only the inductive resistance of the elimination by its winding limits, and the voltage on the winding is no more than linear line voltage
Do not reduce the development of accident in the impaired Zero sequence current amplitude that forms in mutually, and be enough to start the electric current protector of this phase.Through after being enough to discern a period of time of single phase ground fault in the impaired ultramagnifier, monitor and control module cut-off switch module, and the mould bus of reactor from part broken away from.
After the operation protector, discern impaired ultramagnifier single phase ground fault after the requisite time during through the startup protector, monitoring produces the high-tension cut-out of mould with control module.Therefore the contact release of the vacuum interrupter of switch module, and after eliminating damage, the contact of selector is by setting up up to closed again mechanically driving of bulk channel at the neutral point state.
Before eliminating damage and missing null sequence voltage in the network, the high-tension bulk channel of module closure again is obstructed, and it occurs in after the startup of caused protector of impaired phase.
Three selectors can be in one of them of following latched position:
Module switch electrically＜＜Is " comprises "-is connected to the mould bus.
Module switch＜＜Is " isolation "-isolation.
＜＜Is " ground connection " if-main contacts of module switch forms, but the winding ground connection of reactor then.
Under nominal situation, selector is in＜＜Is " comprises " that the main contacts of module switch disconnects.
Because the magnetic circuit of three-phase non-saturable reactor is carried out three nodes, therefore not indication (direct) in the null sequence magnetic flux, and only limit reactor null sequence resistance by its inductive resistance of elimination of winding.
If desired all parts (inventory) that are provided with in the shell are carried out the applicability inspection and maintenance, then the contact of selector is transformed into ground state (standing).In the front portion, the high-pressure modular compartment is had the removable forward direction panel of rectangular window isolates.This window is by the sealing of a slice high-strength transparence Merlon, and it allows the monitoring apparatus and the simulator of operating machine.Draw the situation of the armature arm of the state of switch module contact and selector at last.On the forward direction panel of compartment, handle (handhold) " being inferred to be Is cut-out and its distribution inefficacy " is in order to prevent personnel's misoperation because operating selector and switch module.
Overvoltage decline valve is arranged on the unmanned band of each compartment of shell, guarantees the local structural strength that requires.Local field (field of localization) is respectively each compartment.
The parameter of device:
Rated voltage, kB-6 or 10
The rated current of mould bus ,-1600
The electric current of the spalling resistance of mould bus,
Effective value, kA-31.5
Oozing out the time of the electric current of spalling resistance is-3
The electronic stable electric current of mould bus, peak value, kA-80
Overall dimension, mm
Highly-2008
The degree of depth-762
The width of front-330
Weight, kilogram-370
Like this, produced and be used for the detection that is associated with the earth fault that has the network of isolating neutral point and the efficient apparatus of Zero sequence current generator, expanded the supply (arsenal) of Zero sequence current generator in addition.
Therefore, structure is simplified, and speed and reliability improve, and overall dimension and weight descend, and the chance of optimization configuration is provided, and the maintenance fail safe improves.
Commercial Application
The present invention realizes by widely used general equipment in the industry.
Claims (6)
1. equipment that is used for discerning the earth fault ultramagnifier that has the network of isolating neutral point; comprise Zero sequence current filter that is arranged in each output ultramagnifier and the null sequence voltage filter device that is connected to bus; produce Zero sequence current; and be connected to bus by often opening the threephase switch module; the described protected relay of threephase switch module of often opening is controlled; described protection relay is connected to described null sequence voltage filter device; when null sequence voltage surpasses certain level; the temporary transient closed above-mentioned switch module of described null sequence voltage filter device; by the time delay in the described protection relay; described null sequence voltage filter device difference; produce Zero sequence current by the three-phase non-saturable reactor; described three-phase non-saturable reactor has the winding of one group of Y-connection, and the winding of described Y-connection has the Y-connection point of ground connection.
2. equipment as claimed in claim 1 is characterized in that: above-mentioned Zero sequence current and voltage filter device are connected to the specific protection relay to null sequence active power sensitivity.
3. equipment as claimed in claim 1, it is characterized in that: the Zero sequence current generator that has in the three-phase network of isolating neutral point comprises reactor, described reactor has unsaturated magnetic circuit of three nodes and winding, connect with star fashion, have grounded neutral, and be switched to monitoring and control module by the Chang Kaimo piece high voltage that driver provides, by being connected with three vacuum interrupters, selector and vacuum switch module carry out successively, selector is by three armature arms, static contact by three isolation, carry out by three ground connection assemblies and by three assemblies, be connected with bus, and switch module is carried out by three assemblies, be connected with the armature arm of selector and with three assemblies, be connected with the winding of reactor, therefore monitoring is carried out by the chance of identification form circuitry phase closed ground connection on null sequence voltage with control module.
4. equipment as claimed in claim 1, it is characterized in that: provide unified body by shell, described shell has mould bus compartment, and pass through low-voltage compartment, high pressure compartment and reactor compartment set gradually downwards from the top, therefore in being arranged at the mould bus compartment of high pressure compartment back, be provided with and bury device substantially, the ampere wires of mould bus and connector, the Detection ﹠ Controling module is set in low-voltage compartment, and the signal system of subsequent installation and indicating device body, in the high pressure compartment, be provided with switch module and with the selector of its interlocking, and reactor and the conductor that is connected are set in the reactor compartment.
5. equipment as claimed in claim 4 is characterized in that: each compartment provides overvoltage decline valve.
6. equipment as claimed in claim 4, it is characterized in that: described high pressure compartment is carried out by the window of being made by the high-strength transparence Merlon, and providing the simulator of operating machine, it is set to have an opportunity to check by the window utilization simulator of operating machine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/RU2007/000213 WO2008133543A1 (en) | 2007-04-28 | 2007-04-28 | Zero sequence current generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101711447A true CN101711447A (en) | 2010-05-19 |
Family
ID=39925894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200780052774.7A Pending CN101711447A (en) | 2007-04-28 | 2007-04-28 | Zero sequence current generator |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2145369A4 (en) |
| CN (1) | CN101711447A (en) |
| EA (1) | EA016235B1 (en) |
| WO (1) | WO2008133543A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436776B (en) * | 2008-12-15 | 2010-12-22 | 辽宁省电力有限公司锦州供电公司 | Grounding and line selection method for low current grounding system |
| CN106773994B (en) * | 2017-01-09 | 2023-08-04 | 浙江新涛电子科技有限公司 | Circuit for controlling PE ground wire in time sequence and control method |
| CN107623314B (en) * | 2017-09-06 | 2019-04-16 | 李晓明 | A kind of neutral resistor earthed system zero-sequence protection method and system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2157038C1 (en) * | 1999-04-27 | 2000-09-27 | Новосибирский государственный технический университет | Ground fault detector for insulated-neutral supply mains |
| RU2217851C1 (en) * | 2002-03-14 | 2003-11-27 | Общество С Ограниченной Ответственностью "Промышленная Группа Тэл Таврида Электрик" | Switchgear and control gear |
| FI115488B (en) * | 2003-10-22 | 2005-05-13 | Abb Oy | Method and apparatus for detecting a breaking earth fault in a power distribution network |
| JP2007068279A (en) * | 2005-08-30 | 2007-03-15 | Chubu Electric Power Co Inc | Method for detecting earth fault |
-
2007
- 2007-04-28 WO PCT/RU2007/000213 patent/WO2008133543A1/en active Application Filing
- 2007-04-28 EP EP07834948.7A patent/EP2145369A4/en not_active Withdrawn
- 2007-04-28 EA EA200901464A patent/EA016235B1/en not_active IP Right Cessation
- 2007-04-28 CN CN200780052774.7A patent/CN101711447A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
| CN113484681B (en) * | 2021-07-14 | 2022-09-23 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| EA200901464A1 (en) | 2010-04-30 |
| EP2145369A1 (en) | 2010-01-20 |
| WO2008133543A1 (en) | 2008-11-06 |
| EA016235B1 (en) | 2012-03-30 |
| EP2145369A4 (en) | 2014-01-22 |
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| PB01 | Publication | ||
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Application publication date: 20100519 |