CN106921152A - A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch - Google Patents
A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch Download PDFInfo
- Publication number
- CN106921152A CN106921152A CN201510994303.4A CN201510994303A CN106921152A CN 106921152 A CN106921152 A CN 106921152A CN 201510994303 A CN201510994303 A CN 201510994303A CN 106921152 A CN106921152 A CN 106921152A
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- CN
- China
- Prior art keywords
- induction reactance
- shorting switch
- neutral point
- grounding
- earthing
- 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- Withdrawn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
- 230000001939 inductive effect Effects 0.000 title claims abstract description 54
- 230000001264 neutralization Effects 0.000 title claims abstract description 30
- 239000007787 solid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 230000001131 transforming Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
Abstract
The invention discloses a kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch, it is directed to and is particularly big-and-middle-sized unit using the Hydropower Unit of high resistance grounding, occurs operating mode of the three-phase exit potential unbalance factor more than 2% before generator connecting in parallel with system.When the secondary induction reactance shorting switch of induction reactance earthing or grounding means high disconnects, using the impedance transformation characteristic of transformer, induction reactance high is equivalent to.Grounding transformer primary side is connected between generator neutral point and ground, induction reactance earthing or grounding means high is become.After secondary induction reactance shorting switch closes, grounding transformer secondary circuit short-circuit, now generator neutral point be grounded by grounding transformer short-circuit impedance, its outlet three-phase imbalance rate can meet the no more than GB of 2% rated voltage and industry standard requirement.In hydrogenerator start process, secondary induction reactance shorting switch is closed, and rated speed is reached in hydrogenerator, three-phase exit potential reach rated value it is grid-connected while, secondary induction reactance shorting switch disconnects.
Description
Technical field
The present invention relates to generator neutral point induction reactance earthing or grounding means high, a kind of induction reactance earthing or grounding means high of the large-sized water turbine generator neutral point with secondary induction reactance shorting switch is further related to.When exit potential unbalance factor is more than 2% rated voltage before generator connecting in parallel with system, generator neutral point displacement voltage can be effectively reduced using the present apparatus, within generator three-phase exit potential unbalance factor is limited in into standard and industry standard requirement.Apparatus of the present invention have the characteristics of good appearance, internal structure are compact, easy to use, safe and reliable to operation, protective relaying device is relatively easy, in can be widely used in big-and-middle-sized hydroelectric generator earth neutral system.
Background technology
A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch is a kind of product of the code regulation and market demand research and development being grounded according to relevant national standard and big-and-middle-sized hydraulic power plant's generator neutral point.On the basis of original generator neutral point induction reactance earthing or grounding means high, grounding transformer secondary side increased secondary induction reactance shorting switch for it, with secondary reactor and secondary capacitor in parallel.In hydrogenerator start process, secondary induction reactance shorting switch closes, grounding transformer secondary circuit short-circuit, and now generator neutral point earth-return circuit is Low ESR（Impedance components are mainly the short-circuit impedance of grounding transformer）Ground state, can be approximately considered generator neutral point and be directly grounded.The displacement voltage of generator neutral point is very low under such conditions, and the exit potential three-phase imbalance rate before hydrogenerator start is grid-connected can be met within the scope of standard and no more than 2% rated voltage of industry standard requirement.Hydrogenerator start is finished while being connected to the grid; secondary induction reactance shorting switch disconnects; now earthing or grounding means is rendered as induction reactance ground state high in generator neutral point loop; can be when there is singlephase earth fault in generator; current in the fault point is limited within 15A; and limit generator and perfect the overvoltage multiple of phase below 2.6 times of specified phase voltages, reach the purpose of protection generator.
The content of the invention
The purpose of the present invention is to there are provided a kind of generator neutral point induction reactance earthing or grounding means high, and it is a kind of compact conformation to refer in particular to, simple to operate, generator neutral point of the operation maintenance easily with secondary induction reactance shorting switch induction reactance earthing or grounding means high.
To achieve the above object, the present invention uses following technical measures：
A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch, it is made up of grounding transformer, secondary reactor, secondary resistor, secondary induction reactance shorting switch, first and second current transformer, disconnecting switch and some electric controling elements, shell etc..It is characterized in that：Grounding transformer, secondary reactor, secondary resistor, secondary induction reactance shorting switch, first and second current transformer, disconnecting switch and electric controling element are arranged in a shell for closing, generator neutral point lead is connected to head end terminal of grounding transformer coil, by tail end terminal ground of grounding transformer coil.Secondary reactor and secondary capacitor in parallel are connected on the secondary terminals of grounding transformer.Secondary reactor and current transformer are arranged in the lower section of secondary resistor.Secondary induction reactance shorting switch is arranged in cabinet inner bottom part, and two ends are connected on the secondary terminals of grounding transformer.
Secondary induction reactance shorting switch is from a conjunction point fast response time（Response speed≤20ms）, the high-quality solid-state rest switch of stable and reliable operation.
All components of the generator neutral point high resistance grounding device with secondary induction reactance shorting switch are within a shell for closing, shell landing is installed, possess excellent outward appearance and mechanical strength, while appearance and size considers to leave enough heat-dissipating spaces in cabinet.
Brief description of the drawings
Fig. 1 is a kind of induction reactance earthing or grounding means electrical schematic diagram high of the generator neutral point with secondary induction reactance shorting switch.
Fig. 2 is a kind of induction reactance earthing or grounding means outline drawing high of the generator neutral point with secondary induction reactance shorting switch.
Fig. 3 is a kind of induction reactance earthing or grounding means cut-away view high of the generator neutral point with secondary induction reactance shorting switch.
Wherein:Input terminal（1）, disconnecting switch（2）, grounding transformer（3）, a head end terminal（4）, a tail end terminal（5）, primary current transformer（6）, secondary current transformer（7）, secondary reactor（8）, secondary resistor（9）, secondary induction reactance shorting switch（10）, shell（11）, grounding transformer secondary terminals（12）（13）, ground terminal（14）, secondary reactor Foil winding（15）, shielding iron core（16）, aluminium radome（17）, secondary resistor piece（18）.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
A kind of generator neutral point induction reactance earthing or grounding means high, it is by input terminal（1）, disconnecting switch（2）, grounding transformer（3）, a head end terminal（4）, a tail end terminal（5）, primary current transformer（6）, secondary current transformer（7）, secondary reactor（8）, secondary resistor（9）, secondary induction reactance shorting switch（10）, shell（11）, grounding transformer secondary terminals（12）（13）, ground terminal（14）Composition, it is characterised in that：Generator neutral point is by cable or connection row（Line）It is connected on the input terminal of the present apparatus（1）On, by disconnecting switch（2）Access grounding transformer（3）A head end terminal（4）, then by tail end terminal of grounding transformer（5）With primary current transformer（6）It is connected to shell（11）On.Shell（11）It is provided with Special grounding terminal（14）It is connected with grounded screen.This completes the wiring of a second part of the present apparatus.
Grounding transformer（3）Secondary terminals（12）The first line of a couplet is connected to secondary reactor（8）, secondary resistor（9）With secondary induction reactance shorting switch（10）Each line bank, meanwhile, grounding transformer secondary terminals（12）Also with shell（11）It is connected with copper bar and is grounded.Grounding transformer（3）Secondary terminals（13）By secondary current transformer（7）Afterwards, with secondary reactor（8）, secondary resistor（9）With secondary induction reactance shorting switch（10）Each another line bank be connected.So secondary reactor（8）, secondary resistor（9）With secondary induction reactance shorting switch（10）Just it is connected in grounding transformer in parallel（3）Secondary side.
Grounding transformer（3）Secondary side couples secondary induction reactance shorting switch（10）, when secondary induction reactance shorting switch（10）When closing, grounding transformer（3）Secondary circuit short-circuit, now generator neutral point is by grounding transformer short-circuit impedance formation Low ESR ground connection.When secondary induction reactance shorting switch（10）Disconnect, generator neutral point ground connection becomes induction reactance high and is grounded by Low ESR ground connection.
Claims (3)
1. a kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch is the secondary reactor in generator neutral point induction reactance earthing or grounding means high（8）, secondary resistor（9）Turnover line terminals secondary induction reactance shorting switch in parallel（10）.
2. two induction reactance shorting switch (10) are solid stationary switch.
3. it is made up of IGCT, control circuit, fastp-acting fuse and air-cooled radiator, can be manually manipulated, it is also possible to is closed or disconnected automatically by operating mode setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510994303.4A CN106921152A (en) | 2015-12-28 | 2015-12-28 | A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510994303.4A CN106921152A (en) | 2015-12-28 | 2015-12-28 | A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106921152A true CN106921152A (en) | 2017-07-04 |
Family
ID=59454823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510994303.4A Withdrawn CN106921152A (en) | 2015-12-28 | 2015-12-28 | A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106921152A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN1265532A (en) * | 2000-03-30 | 2000-09-06 | 华中理工大学 | Earthing protection method for stator of power generator |
| CN103414159A (en) * | 2013-08-28 | 2013-11-27 | 国家电网公司 | Method for solving generator stator ground protection lag removal faults |
| CN204651919U (en) * | 2015-02-15 | 2015-09-16 | 凯里供电局 | A kind of 10kV neutral point of electric network joint grounding device |
| CN104917148A (en) * | 2014-03-12 | 2015-09-16 | 南京南瑞继保电气有限公司 | Generator injection type stator grounding protection method and protection device |
-
2015
- 2015-12-28 CN CN201510994303.4A patent/CN106921152A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN1265532A (en) * | 2000-03-30 | 2000-09-06 | 华中理工大学 | Earthing protection method for stator of power generator |
| CN103414159A (en) * | 2013-08-28 | 2013-11-27 | 国家电网公司 | Method for solving generator stator ground protection lag removal faults |
| CN104917148A (en) * | 2014-03-12 | 2015-09-16 | 南京南瑞继保电气有限公司 | Generator injection type stator grounding protection method and protection device |
| CN204651919U (en) * | 2015-02-15 | 2015-09-16 | 凯里供电局 | A kind of 10kV neutral point of electric network joint grounding device |
Non-Patent Citations (1)
| Title |
|---|
| 陶亦寿等: "天堂抽水蓄能电站发电电动机", 《水力发电》 * |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170704 |
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| WW01 | Invention patent application withdrawn after publication |