CN105958456A - Retaining circuit with bus residual voltage - Google Patents
Retaining circuit with bus residual voltage Download PDFInfo
- Publication number
- CN105958456A CN105958456A CN201610469398.2A CN201610469398A CN105958456A CN 105958456 A CN105958456 A CN 105958456A CN 201610469398 A CN201610469398 A CN 201610469398A CN 105958456 A CN105958456 A CN 105958456A
- Authority
- CN
- China
- Prior art keywords
- current
- limiting
- residual voltage
- control unit
- disconnecting switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a retaining circuit with a bus residual voltage, and relates to the technical field of the power system. The retaining circuit is characterized by comprising a Rogowski coil, a measurement and control unit, a current converter, a disconnecting switch, a current-limiting impedor, a microcomputer comprehensive protection apparatus and a current transformer, wherein one end of the measurement and control unit is connected with the Rock coil while the other end of the measurement and control unit is connected with one end of the microcomputer comprehensive protection apparatus, one end of the current converter, the disconnecting switch and one end of the current-limiting impedor separately; the other end of the microcomputer comprehensive protection apparatus is connected with the current transformer; and one end of the current-limiting impedor is connected with the disconnecting switch while the other end of the current-limiting impedor is connected with the other end of the current converter. The retaining circuit can be used to replace a branch circuit breaker and a common series-wound current-limiting electric reactor; the current-limiting impedor can be input rapidly; the bus is high in residual voltage; and the retaining circuit can maintain the continuous operation of an important load without being affected.
Description
Technical field
The present invention relates to technical field of power systems, be specifically related to a kind of holding circuit with bus residual voltage.
Background technology
In the electric power system of current a lot of a certain electric pressure of enterprises medium voltage network, if a certain bar branch road is short-circuited, on the bus being connected with this branch road, voltage drops seriously suddenly, bus residual voltage is generally below the 20% of specified definition voltage, only cut-off when this branch breaker, excise short trouble, busbar voltage could be recovered, busbar voltage is exactly chopper time of cut-offfing short trouble from suddenly dropping to recover during this period of time, about at about 0.1 second, the namely time (20ms-30ms) of computer integrated protection failure judgement, plus chopper intrinsic movement time (40ms-80ms), plus electric arc zero-crossing timing (about 16ms), there is depression during this period of time in busbar voltage, Enterprise Power System referred to as " shakes electric ".nullDuring " rolling electricity " occurs，Bus residual voltage is the lowest，The load running making some faults that are not short-circuited is interrupted，Such as converter、Motor、Relay、Electromagnetic valve etc.，These are referred to as sensitive loads to the load of " shaking electric " significant reaction，It is characterized in mechanical movement and has electric energy or the existence of magnetic energy energy-storage travelling wave tube，The motor used in enterprise mostly is asynchronous machine，And the holding of the rotating excitation field of asynchronous machine comes from the reactive power support of electrical network，During certain branch, short-circuit, bus residual voltage is the lowest，Asynchronous machine on other branch roads can not get reactive power support，And also want short dot output short circuit current，The short circuit time constant of asynchronous machine is at below 30ms，" rolling electricity " 3T around，The magnetic field of the asynchronous machine exponentially decayed is depleted，When after short circuit trouble point excises, voltage recovers，Asynchronous machine is rebuild magnetic field and is created the impact of 5-7 times of rated current by electrical network，Protective relaying maloperation is caused to make.
When generally bus remains in less than 50%, sensitive loads tolerable " shaking electric " time is not more than 30ms, when foreign network is short-circuited fault, district's Intranet all can be loaded or part important load is switched to another foreign network, but certain branch path is short-circuited and cannot entirety have switched in district's Intranet, can only partly switch, if sensitive loads important in district's Intranet the most artificially focuses on minority branch road or other circuitry number are the most few, part switching is to solve the problem that district's Intranet short circuit causes important load to stop transport, essential condition is intended to the suitable foreign network that can switch, if sensitive loads branch road important in district's Intranet is a lot, the cost of part switching is the biggest.
Summary of the invention
It is an object of the invention to provide a kind of holding circuit with bus residual voltage, it can substitute branch breaker, commonly connect current-limiting reactor, can quickly put into current-limiting impedance, and the residual voltage of bus is high, can meet maintenance important load and continue to run with and unaffected.
In order to solve the problem in the presence of background technology; the present invention is by the following technical solutions: it includes Rogowski coil 1, measurement and control unit 2, inverter 3, disconnecting switch 4, current-limiting impedance 5, computer integrated protection 6, current transformer 7; described measurement and control unit 2 one terminates Rogowski coil 1; the other end connects computer integrated protection 6 one end, inverter 3 one end, disconnecting switch 4 and current-limiting impedance 5 one end respectively; another termination current transformer 7 of computer integrated protection 6; current-limiting impedance 5 one terminates disconnecting switch 4, and another terminates inverter 3 other end.
nullThe measurement and control unit of the present invention monitors branch current by Rogowski coil，In short circuit current enters current-limiting impedance，Limiting short-circuit current，Amplitude of short circuit is substantially reduced，Can be short-circuited in fault 6-16 millisecond in branch equipment，Bus residual voltage is maintained at more than the 95% of rated voltage，Ensure that the normal work of other fault-free sensitive loads，The short-circuit impact suffered by equipment such as main transformer is substantially reduced simultaneously，After short trouble D1 excision in branch path，Measurement and control unit detection branch electric current close to during rated current immediately to inverter order，In 10 milliseconds, current-limiting impedance exits，System can recover properly functioning，If being short-circuited, the branch road of fault is being short-circuited more than 300 milliseconds，Fault does not release，Then measurement and control unit will be considered that it is branch path vacuum circuit breaker tripping or the bus-bar fault of branch road of trouble point，Separating brake order is sent immediately to disconnecting switch，Excise this branch road.
The bus residual voltage holding means of the present invention, it can substitute branch breaker, commonly connect current-limiting reactor, can quickly put into current-limiting impedance, the residual voltage of bus is promptly restored to rated voltage more than 95%, not only maintain bus residual voltage, maintenance important load can be fully met continue to run with and unaffected, to do not allow instantaneous interruptedly supplying power must the important load of self-starting by force, power supply quality can be improved.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the present invention.
Detailed description of the invention
See Fig. 1; a kind of holding circuit with bus residual voltage; it includes Rogowski coil 1, measurement and control unit 2, inverter 3, disconnecting switch 4, current-limiting impedance 5, computer integrated protection 6, current transformer 7; described measurement and control unit 2 one terminates Rogowski coil 1; the other end connects computer integrated protection 6 one end, inverter 3 one end, disconnecting switch 4 and current-limiting impedance 5 one end respectively; another termination current transformer 7 of computer integrated protection 6; current-limiting impedance 5 one terminates disconnecting switch 4, and another terminates inverter 3 other end.
nullThe measurement and control unit of the present invention monitors branch current by Rogowski coil，In short circuit current enters current-limiting impedance，Limiting short-circuit current，Amplitude of short circuit is substantially reduced，Can be short-circuited in fault 6-16 millisecond in branch equipment，Bus residual voltage is maintained at more than the 95% of rated voltage，Ensure that the normal work of other fault-free sensitive loads，The short-circuit impact suffered by equipment such as main transformer is substantially reduced simultaneously，After short trouble D1 excision in branch path，Measurement and control unit detection branch electric current close to during rated current immediately to inverter order，In 10 milliseconds, current-limiting impedance exits，System can recover properly functioning，If being short-circuited, the branch road of fault is being short-circuited more than 300 milliseconds，Fault does not release，Then measurement and control unit will be considered that it is branch path vacuum circuit breaker tripping or the bus-bar fault of branch road of trouble point，Separating brake order is sent immediately to disconnecting switch，Excise this branch road.
The present invention can substitute branch breaker, commonly connect current-limiting reactor, can quickly put into current-limiting impedance, the residual voltage of bus is promptly restored to rated voltage more than 95%, not only maintain bus residual voltage, maintenance important load can be fully met continue to run with and unaffected, to do not allow instantaneous interruptedly supplying power must the important load of self-starting by force, power supply quality can be improved.
Claims (1)
1. a holding circuit with bus residual voltage; it is characterized in that; it includes Rogowski coil, measurement and control unit, inverter, disconnecting switch, current-limiting impedance, computer integrated protection, current transformer; described measurement and control unit one terminates Rogowski coil; the other end connects computer integrated protection one end, inverter one end, disconnecting switch and current-limiting impedance one end respectively; another termination current transformer of computer integrated protection, current-limiting impedance one terminates disconnecting switch, and another terminates the inverter other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610469398.2A CN105958456A (en) | 2016-06-25 | 2016-06-25 | Retaining circuit with bus residual voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610469398.2A CN105958456A (en) | 2016-06-25 | 2016-06-25 | Retaining circuit with bus residual voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105958456A true CN105958456A (en) | 2016-09-21 |
Family
ID=56904869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610469398.2A Withdrawn CN105958456A (en) | 2016-06-25 | 2016-06-25 | Retaining circuit with bus residual voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105958456A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
-
2016
- 2016-06-25 CN CN201610469398.2A patent/CN105958456A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105098744A (en) | Bus residual voltage maintenance device | |
| CN205646794U (en) | Explosion bridge type generating line residual voltage holding device | |
| CN203278210U (en) | Busbar residual voltage maintaining device | |
| CN102931648A (en) | Bus residual voltage holding device | |
| CN101728819B (en) | Intelligent switch and control method thereof | |
| CN110912114A (en) | High-safety low-voltage direct current system | |
| CN113595227A (en) | Low-voltage transformer area load uninterrupted switching system and working method thereof | |
| CN215300162U (en) | Low-voltage transformer area load uninterrupted switching system | |
| CN202917965U (en) | Busbar residual voltage maintaining device | |
| CN203014359U (en) | Busbar residual voltage maintaining device | |
| JP4648789B2 (en) | Isolated operation prevention system | |
| CN104821564A (en) | Bus residual voltage maintaining device | |
| CN105958456A (en) | Retaining circuit with bus residual voltage | |
| CN106899009A (en) | A kind of LC series resonances bus residual voltage keeps system | |
| CN203368013U (en) | Protection device for residual voltage of bus | |
| CN203826938U (en) | Continuous chemical industry power supply anti-voltage-sage system | |
| CN206628823U (en) | A kind of FSR high capacity and high speed switchgearses | |
| CN102545170A (en) | Microgrid busbar differential protection device | |
| CN104348149A (en) | Primary side neutral point ground control system for 10kV potential transformer (PT) | |
| CN202424110U (en) | High-capacity fast switching device | |
| CN104882859A (en) | Holding circuit capable of rapidly triggering current limiting impeder | |
| CN105914724A (en) | Bus residual voltage retaining device | |
| CN106026058A (en) | Holding circuit having bus residual voltage | |
| CN106026057A (en) | Bus residual voltage holding device | |
| CN104868455A (en) | Bus residual voltage maintaining device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160921 |