CN108808729A - A kind of novel circuit configuration of electric main power connection in power plant - Google Patents
A kind of novel circuit configuration of electric main power connection in power plant Download PDFInfo
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- CN108808729A CN108808729A CN201810581734.1A CN201810581734A CN108808729A CN 108808729 A CN108808729 A CN 108808729A CN 201810581734 A CN201810581734 A CN 201810581734A CN 108808729 A CN108808729 A CN 108808729A
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- 230000001681 protective effect Effects 0.000 claims abstract description 23
- 230000013011 mating Effects 0.000 claims abstract description 7
- 230000007935 neutral effect Effects 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 abstract description 12
- 230000007774 longterm Effects 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 abstract description 5
- 230000009466 transformation Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- 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
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- 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
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- H02J3/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to power generation, power transformation and field of power distribution, especially a kind of novel circuit configuration of electric main power connection in power plant.The present invention includes two sets of units; often set unit includes generator, transformer group unit and power distribution equipment; generator is connected through transformer group unit, power distribution equipment and power grid; generator is also mating to be provided with protective relaying device A; transformer group unit is also mating to be provided with protective relaying device B, and reactive power compensator is additionally provided in unit.The present invention by installing reactive power compensator in the power system; the reactive power that inductive load is consumed is provided; reduce the reactive power that power supply is provided to inductive load, conveyed by circuit; reduce line and transformer electric energy loss caused by conveying reactive power; two-shipper group is set in addition; the normal operation in power plant is ensured, and the protective relaying device installed makes the safety coefficient higher of equipment, contributes to the long-term and effective operation of equipment.
Description
Technical field
The present invention relates to power generation, power transformation and field of power distribution, the new-type circuit knot of especially a kind of electric main power connection in power plant
Structure.
Background technology
Find that net capacity, the reactive power of some countries and regions are insufficient during power construction, outer net power transmission line
Road is longer, and the equipment in power plant belongs to inductive load mostly, it is difficult to realize a whole set of startup in limited rated power, result in
Power plant cannot normally be started and run；Additionally due to transmission line of electricity is long, user demand is big, and network system is relatively weak, electricity consumption
Clearly, damage of the severe power grid environment for equipment is very big for peak and low valley, also to the long-term and effective operation band in power plant
Carry out larger threat.
Invention content
The object of the present invention is to provide a kind of novel circuit configurations of electric main power connection in power plant, by power train
Reactive power compensator is installed in system, the reactive power that inductive load is consumed is provided, reduce power supply to inductive load provide, by
The reactive power of circuit conveying, reduces line and transformer electric energy loss caused by conveying reactive power, two-shipper is arranged in addition
Group has ensured the normal operation in power plant, and the protective relaying device installed makes the safety coefficient higher of equipment, contributes to
The long-term and effective operation of equipment.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of novel circuit configuration of electric main power connection in power plant, including two sets of units, the often set unit includes power generation
Machine, transformer group unit and power distribution equipment, the generator are connected through transformer group unit, power distribution equipment and power grid, the hair
Motor is also mating to be provided with protective relaying device A, and the transformer group unit is also mating to be provided with protective relaying device B, described
Reactive power compensator is additionally provided in unit.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the transformer group unit include main transformer, encourage
Magnetic transformer and HV Auxiliary Transformer, the main transformer are set between generator and power distribution equipment, the main transformer
On be provided with current transformer C, the exciting transformer and HV Auxiliary Transformer are connect through branch with generator respectively.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the power distribution equipment include that ground connection connected in sequence is opened
A, disconnecting switch A, current transformer group A, breaker A and earthing switch B are closed, the earthing switch B is also associated with to be set through parallel connection
The disconnecting switch B and disconnecting switch b set, the power grid includes busbar A and busbar B, and disconnecting switch B is connect with busbar A, it is described every
Pass b is left to connect with busbar B.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the protective relaying device A includes current transformer
Group B, current transformer group C and relay protection circuit, the current transformer group B and current transformer group C are connected to generator
Lead end both sides, the current transformer group C are set between main transformer and generator, the current transformer group B also with
Relay protection circuit connects, and the relay protection circuit includes the generator neutral point ground resistance and current transformer A of connection.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the protective relaying device B include being set to main transformer
The current transformer group D of depressor both sides and current transformer group E, the current transformer group D be set to current transformer group C and
Between main transformer, breaker B is additionally provided between the current transformer group D and main transformer；The protective relaying device B
Further include a fuse A, voltage transformer C, breaker C, current transformer group F, high factory change neutral resistance D and electricity
Current transformer B draws two branches on the circuit that the current transformer group D is connect with main transformer, wherein a branch according to
Secondary to connect once fuse A and voltage transformer C, in addition a branch is connected with breaker C, current transformer group in turn
F, HV Auxiliary Transformer, high factory become neutral resistance D and current transformer B.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the current transformer group C and current transformer group D
Between be also connected with exciting transformer through branch, branch circuit parallel connection where exciting transformer has a two other branch, described wherein one
Item branch road is connected with a fuse B and voltage transformer A, and another branch road is connected with a fuse C and electricity
Press mutual inductor B.
The novel circuit configuration of electric main power connection in power plant above-mentioned, further include two groups connect with power grid power input/
Output system, the power input/output system include disconnecting switch C connected in sequence, earthing switch C, breaker D, electric current
Mutual inductor group G, disconnecting switch D, earthing switch D and three phase mains input/output terminal, the earthing switch C are also associated with through simultaneously
Join the disconnecting switch C and disconnecting switch c of setting, the disconnecting switch C connect with busbar A, the disconnecting switch c and busbar B companies
It connects.
The novel circuit configuration of electric main power connection in power plant above-mentioned, the reactive power compensator include that capacitance and setting exist
It is parallel with one group of reactive power compensator, the Current Mutual Inductance respectively on voltage transformer on capacitance, the busbar A and busbar B
One group of reactive power compensator, disconnecting switch D and three phase mains input/output terminal are also parallel between device group E and earthing switch A
Between branch road be also parallel with one group of reactive power compensator.
The novel circuit configuration of electric main power connection in power plant above-mentioned further includes lightning protection device, the lightning protection
Device includes arrester A, arrester B, arrester C and arrester D, and the arrester A is arranged in parallel with exciting transformer, described
Arrester B is arranged in parallel with voltage transformer C, and the arrester C is connected to disconnecting switch D and three phase mains input/output terminal
Between, the arrester D is set between current transformer group E and earthing switch A.
The novel circuit configuration of electric main power connection in power plant above-mentioned further includes busbar breaker, the busbar breaker
It is connect with power grid, the busbar breaker includes disconnecting switch E, breaker E, current transformer group H and isolation connected in sequence
Switch F, wherein disconnecting switch E are connect with busbar A, and disconnecting switch F is connect with busbar B.
Compared with prior art, the invention has the beneficial effects that：
1) present invention is by providing a kind of novel circuit configuration of electric main power connection in power plant, by pacifying in the power system
Reactive power compensator is filled, the reactive power that inductive load is consumed is provided, reduces power supply and is provided to inductive load, is defeated by circuit
The reactive power sent reduces line and transformer electric energy loss caused by conveying reactive power, and two-shipper group is arranged in addition, ensures
The normal operation in power plant, and the protective relaying device installed makes the safety coefficient higher of equipment, contributes to equipment
Long-term and effective operation；
2) by the way that transformer group unit is arranged, the output voltage of generator is changed, wherein high-voltage Auxiliary transformation
Device provides station service, and the stand-by power supply of the HV Auxiliary Transformer as another unit to same unit, and exciting transformer is
The rotor of generator is powered, and carries out voltage and Reactive-power control to generator, and main transformer improves the output voltage of generator,
To make voltage reach transfer criteria, and electric current is connected to the grid by power distribution equipment；
3) current transformer is used by many places in the unit, to each important line, each transformer and power generation
The important equipments such as machine have carried out overcurrent protection, when current is excessive can open-circuit line, avoid equipment and important line and burnt
It is bad；
4) reactive power compensator for coordinating capacitance to use by the way that voltage transformer is arranged in the unit, to monitor machine in real time
Voltage in group, it is in parallel to select an appropriate number of capacitance to carry out, so that it is guaranteed that not occurring resonance mistake in high voltage supply system
There is the security risk of breakdown power supply bureau's transformer and user transformers so as to avoid excessively high resonance potential in voltage phenomenon,
It ensure that high voltage supply system highly effective and safe is run, also met by reactive power compensator in addition when voltage supplies insufficient,
For the inductive loads equipment replacement reactive power such as motor, transformer so that it is guaranteed that a whole set of operation of power plant equipment, the voltage
Mutual inductor connection a fuse, for circuit occur short circuit, overcurrent the problems such as when can disconnecting circuit, to equipment and control
Control equipment provides protection；
5) by the way that earthing switch A, disconnecting switch A, breaker A, disconnecting switch B, disconnecting switch b are arranged in power distribution equipment
Electric current is enable to obtain maltilevel security guarantee by power distribution equipment with earthing switch B, electric voltage exception such as occur can cut in time
Road break to ensure the normal operation of transmission line of electricity；
6) by for generator, transformer and important line zinc oxide surge arresters so that generator, transformer are this kind of important to be set
Standby and other important lines can be protected, it is ensured that direct lightning strike and lightning wave can not invade, to ensure that the peace of equipment
Complete and effectively operation；
7) it is connect with busbar A by the way that disconnecting switch B is arranged, the disconnecting switch b is connect with busbar B so that power distribution equipment
Allow hand over the connection with busbar A, busbar B；It is connect with busbar A by the way that disconnecting switch C is arranged, the disconnecting switch c and busbar B
Connection so that power input/output system allows hand over the connection with busbar A, busbar B；
8) by the way that busbar breaker is arranged, cooperation disconnecting switch B, disconnecting switch b, disconnecting switch C and disconnecting switch c can
To change two bus running manners, make two busbar isolated operations or Electromagnetic coupling, may additionally serve for busbar overhaul, falls
Lock operates, and not power failure operation is carried out to unit.
Description of the drawings
Fig. 1 is the electric main wiring diagram of the present invention；
Fig. 2 is the wiring diagram of the wherein a set of unit of the present invention；
Fig. 3 be power input/output system in the present invention, reactive power compensator and busbar breaker schematic diagram.
The meaning of reference numeral：1- units, 2- generators, 3- transformer group units, 4- power distribution equipments, 5- power grids, 6- after
Electrical protective device A, 7- protective relaying device B, 8- reactive power compensator, 9- main transformers, 10- exciting transformers, 11- high pressures factory
With transformer, 12- earthing switches A, 13- disconnecting switch A, 14- current transformer group A, 15- breaker A, 16- disconnecting switch B,
17- earthing switches B, 18- current transformer group B, 19- current transformer group C, 20- relay protection circuit, 21- generators are neutral
Point ground resistance, 22- current transformer A, 23- current transformer group D, 24- current transformer group E, 25- breaker B, 26- mono-
Secondary fuse A, 27- voltage transformers C, 28- breaker C, 29- current transformer group F, 31- high factory become neutral resistance
Fuse C, 36- voltage transformer A, 37- the voltage transformer B of fuse B, 35- No. mono- time of D, 32- current transformer B, 34- No. mono- time,
38- power inputs/output system, 39- disconnecting switch C, 40- breaker D, 41- current transformer group G, 42- disconnecting switch D,
43- three phase mains input/output terminals, 44- capacitances, 45- voltage transformers, 46- lightning protection devices, 47- arresters A, 48-
Arrester B, 49- arrester C, 50- busbar breaker, 51- disconnecting switch E, 52- breaker E, 53- current transformer group H,
54- disconnecting switch F, 55- current transformer C, 56- earthing switch C, 57- earthing switch D, 58- arrester D, 59- disconnecting switch
B, 60- disconnecting switch c, 501- busbar A, 502- busbar B.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific implementation mode
The embodiment of the present invention：A kind of novel circuit configuration of electric main power connection in power plant is constituted as shown in Figure 1-Figure 3,
Including two sets of units 1, the often set unit 1 includes generator 2, transformer group unit 3 and power distribution equipment 4, and the generator 2 passes through
Enclosed busbar, power transmission line are connected with transformer group unit 3, power distribution equipment 4, power grid 5 successively, and the generator 2 uses three-phase two
Pole synchronous generator 2, the generator 2 is also mating to be provided with protective relaying device A6, and the transformer group unit 3, which is also matched, to be arranged
It is equipped with protective relaying device B7, reactive power compensator 8 is additionally provided in the unit 1.
The transformer group unit 3 includes main transformer 9, exciting transformer 10 and HV Auxiliary Transformer 11, the master
Transformer 9 selects on-load voltage regulation main transformer 9, is provided with current transformer C55 on the main transformer 9, can carry out overcurrent
Protection, the main transformer 9 are set between generator 2 and power distribution equipment 4, the exciting transformer 10 and high-voltage Auxiliary transformation
Device 11 is connect through branch with generator respectively.
The power distribution equipment 4 includes earthing switch A12 connected in sequence, disconnecting switch A13, current transformer group A14, breaks
Road device A15 and earthing switch B17, the earthing switch B17 are also associated with disconnecting switch B16 and disconnecting switch through being arranged in parallel
B59, the power grid 5 include busbar A501 and busbar B502, and disconnecting switch B16 is connect with busbar A501, the disconnecting switch b59
It is connect with busbar B502, by the way that earthing switch A12 is arranged in power distribution equipment 4, disconnecting switch A13, breaker A15, keeps apart
Closing B16 and earthing switch B17 enables electric current to obtain maltilevel security guarantee by power distribution equipment 4, electric voltage exception energy such as occurs
Enough timely line disconnections are to ensure the normal operation of transmission line of electricity.
The protective relaying device A6 includes current transformer group B18, current transformer group C19 and relay protection circuit
20, the current transformer group B18 and current transformer group C19 are connected to 2 lead end both sides of generator, the current transformer
Group C19 is set between main transformer 9 and generator 2, and the current transformer group B18 is also connect with relay protection circuit 20,
The relay protection circuit 20 includes the generator neutral point ground resistance 21 and current transformer A22 of connection, relay protection dress
It sets A6 and differential protection, overcurrent protection and ground protection has been carried out to generator 2.
The protective relaying device B7 includes the current transformer group D23 and Current Mutual Inductance for being set to 9 both sides of main transformer
Device group E24, the current transformer group D23 are set between current transformer group C19 and main transformer 9, the Current Mutual Inductance
Breaker B25 is additionally provided between device group D23 and main transformer 9；The protective relaying device B7 further includes a fuse
A26, voltage transformer C27, breaker C28, current transformer group F29, high factory become neutral resistance D31 and Current Mutual Inductance
Device B32 draws two branches on the circuit that the current transformer group D23 is connect with main transformer 9, wherein a branch according to
Secondary to connect once fuse A26 and voltage transformer C27, in addition a branch is connected with breaker C28, Current Mutual Inductance in turn
Device group F29, HV Auxiliary Transformer 11, high factory become neutral resistance D31 and current transformer B32.The relay protection
Device B7 cooperations current transformer group A14 also protects main transformer 9 to the lead-out wire between power distribution equipment 4.
It also is connected with exciting transformer 10 through branch between the current transformer group C19 and current transformer group D23, is encouraged
10 place branch circuit parallel connection of magnetic transformer has a two other branch, a wherein branch road be connected with a fuse B34 and
Voltage transformer A36, another branch road are connected with a fuse C35 and voltage transformer B37.
The novel circuit configuration of the electric main power connection in power plant, further include two groups connect with power grid 5 power input/it is defeated
Go out system 38, the power input/output system 38 includes disconnecting switch C39 connected in sequence, earthing switch C56, breaker
D40, current transformer group G41, disconnecting switch D42, earthing switch D57 and three phase mains input/output terminal 43, the ground connection are opened
It closes C56 and is also associated with disconnecting switch C39 and disconnecting switch c60, the disconnecting switch C39 and busbar A501 through being arranged in parallel
Connection, the disconnecting switch c60 are connect with busbar B502.
The reactive power compensator 8 includes capacitance 44 and the voltage transformer 45 being arranged on capacitance 44, the busbar
One group of reactive power compensator 8, the current transformer group E24 and earthing switch A12 are parallel on A501 and busbar B502 respectively
Between be also parallel with one group of reactive power compensator 8, branch between disconnecting switch D42 and three phase mains input/output terminal 43 road
It is also parallel with one group of reactive power compensator 8, by the way that reactive power compensator 8 is arranged, to monitor the voltage in unit 1 in real time, from
And an appropriate number of capacitance 44 is selected to carry out parallel connection, so that it is guaranteed that do not occur resonance overvoltage phenomenon in high voltage supply system, from
And the security risk that excessively high resonance potential has breakdown power supply bureau's transformer and user transformers is avoided, it ensure that high pressure supplies
Electric system highly effective and safe is run, and is also met by reactive power compensator 8 when voltage supplies insufficient in addition, is motor, transformation
The inductive loads equipment replacement reactive power such as device is so that it is guaranteed that a whole set of of power plant equipment is run.
The novel circuit configuration of the electric main power connection in power plant further includes lightning protection device 46, the lightning protection
Device 46 includes arrester A47, arrester B48, arrester C49 and arrester D58, the arrester A47 and exciting transformer
10 are arranged in parallel, and the arrester B48 and voltage transformer C27 is arranged in parallel, and the arrester C49 is connected to disconnecting switch
Between D42 and three phase mains input/output terminal 43, the arrester D58 is set to current transformer group E24 and earthing switch
Between A12, by for generator 2, transformer and important line zinc oxide surge arresters so that generator 2, transformer are this kind of important
Equipment and other important lines can be protected, it is ensured that direct lightning strike and lightning wave can not invade, to ensure that equipment
Safety and effectively operation.
The novel circuit configuration of the electric main power connection in power plant further includes busbar breaker 50, the busbar breaker
50 connect with power grid 5, and the busbar breaker 50 includes disconnecting switch E51 connected in sequence, breaker E52, current transformer
H53 and disconnecting switch F54 is organized, wherein disconnecting switch E51 is connect with a busbar in power grid 5, disconnecting switch F54 and power grid 5
In another busbar connection, by be arranged busbar breaker 50, so as to cut off the power supply of two units 1, easy access.
The operation principle of the present invention：The present invention is by protecting generator 2, transformer group unit 3, power distribution equipment 4, relay
The components such as protection unit A6, protective relaying device B7 and reactive power compensator 8 have unit 1 to dress up a kind of electric main power connection in power plant
Novel circuit configuration provides the reactive power that inductive load is consumed by installing reactive power compensator 8 in the power system,
Reduce the reactive power that power supply is provided to inductive load, conveyed by circuit, reduces line and transformer because conveying reactive power
Caused by electric energy loss, two-shipper group 1 is set in addition, has ensured the normal operation in power plant, and the protective relaying device installed
So that the safety coefficient higher of equipment, contributes to the long-term and effective operation of equipment.The present invention by be arranged transformer group unit 3,
The output voltage of generator 2 is changed, wherein HV Auxiliary Transformer 11 provides station service to same unit, and as another
The stand-by power supply of the HV Auxiliary Transformer 11 of one unit, and the rotor that exciting transformer 10 is generator 2 is powered, and to power generation
Machine 2 carries out voltage and Reactive-power control, and main transformer 9 improves the output voltage of generator 2, to make voltage reach conveying mark
Standard, and electric current is connected to the grid 5 by power distribution equipment 4；By the way that many places are using current transformer in unit 1, to each
The important equipments such as important line, each transformer and generator 2 have carried out overcurrent protection, when current is excessive being capable of striping
Road, avoids equipment and important line is burned；The nothing for coordinating capacitance 44 to use by the way that voltage transformer 45 is arranged in unit 1
Reactive power compensation installations 8, to monitor the voltage in unit 1 in real time, to select an appropriate number of capacitance 44 to carry out parallel connection, to really
It protects in high voltage supply system and does not occur resonance overvoltage phenomenon, there is breakdown power supply bureau so as to avoid excessively high resonance potential becomes
The security risk of depressor and user transformers ensure that high voltage supply system highly effective and safe is run, be filled in addition by reactive-load compensation
It sets 8 also to meet when voltage supplies insufficient, is the inductive loads equipment replacement reactive powers such as generator 2, transformer thus really
Protect a whole set of operation of power plant equipment；By the way that earthing switch A12, disconnecting switch A13, breaker are arranged in power distribution equipment 4
A15, disconnecting switch B16, disconnecting switch b59 and earthing switch B17 enable electric current to obtain maltilevel security by power distribution equipment 4
Ensure, such as occur electric voltage exception can in time line disconnection to ensure the normal operation of transmission line of electricity；By for generator
2, transformer and important line zinc oxide surge arresters so that this kind of important equipment of generator 2, transformer and other important line energy
Access protection, it is ensured that direct lightning strike and lightning wave can not invade, the safety to ensure that equipment and effectively operation；Pass through setting
Disconnecting switch B16 is connect with busbar A501, and the disconnecting switch b59 is connect with busbar B502 so that power distribution equipment 4 allows hand over
With the connection of busbar A501, busbar B502；By be arranged disconnecting switch C39 connect with busbar A501, the disconnecting switch c60 and
Busbar B502 connections so that power input/output system 38 allows hand over the connection with busbar A501, busbar B502；By setting
Busbar breaker 50 is set, aforementioned disconnecting switch B16, disconnecting switch b59, disconnecting switch C39 and disconnecting switch c60 are coordinated, it can be with
Change two bus running manners, makes two busbar isolated operations or Electromagnetic coupling, may additionally serve for busbar overhaul, back brake
Operation carries out not power failure operation to unit 1.
Claims (10)
1. a kind of novel circuit configuration of electric main power connection in power plant, which is characterized in that described often to cover including two sets of units (1)
Unit (1) includes generator (2), transformer group unit (3) and power distribution equipment (4), and the generator (2) is through transformer group unit
(3), power distribution equipment (4) is connect with power grid (5), and the generator (2) is also mating to be provided with protective relaying device A (6), the change
Depressor group unit (3) is also mating to be provided with protective relaying device B (7), and reactive power compensator is additionally provided in the unit (1)
(8)。
2. the novel circuit configuration of electric main power connection in power plant according to claim 1, which is characterized in that the transformer
Group unit (3) includes main transformer (9), exciting transformer (10) and HV Auxiliary Transformer (11), and the main transformer (9) sets
It is placed between generator (2) and power distribution equipment (4), current transformer C (55) is provided on the main transformer (9), it is described to encourage
Magnetic transformer (10) and HV Auxiliary Transformer (11) are connect through branch with generator (2) respectively.
3. the novel circuit configuration of electric main power connection in power plant according to claim 2, which is characterized in that described to match Denso
It includes earthing switch A (12) connected in sequence, disconnecting switch A (13), current transformer group A (14), breaker A (15) to set (4)
With earthing switch B (17), the earthing switch B (17) is also associated with disconnecting switch B (16) and disconnecting switch b through being arranged in parallel
(59), the power grid (5) includes busbar A (501) and busbar B (502), and disconnecting switch B (16) is connect with busbar A (501), described
Disconnecting switch b (59) is connect with busbar B (502).
4. the novel circuit configuration of electric main power connection in power plant according to claim 3, which is characterized in that the relay is protected
Protection unit A (6) includes current transformer group B (18), current transformer group C (19) and relay protection circuit (20), the electric current
Mutual inductor group B (18) and current transformer group C (19) is connected to generator (2) lead end both sides, the current transformer group C
(19) it is set between main transformer (9) and generator (2), the current transformer group B (18) is gone back and relay protection circuit
(20) it connects, the relay protection circuit (20) includes the generator neutral point ground resistance (21) and current transformer A of connection
(22)。
5. the novel circuit configuration of electric main power connection in power plant according to claim 4, which is characterized in that the relay is protected
Protection unit B (7) includes the current transformer group D (23) and current transformer group E (24) for being set to main transformer (9) both sides, institute
It states current transformer group D (23) to be set between current transformer group C (19) and main transformer (9), the current transformer group D
(23) breaker B (25) is additionally provided between main transformer (9)；The protective relaying device B (7) further includes a fuse
A (26), voltage transformer C (27), breaker C (28), current transformer group F (29), high factory become neutral resistance D (31)
Two branches are drawn on the circuit being connect with main transformer (9) with current transformer B (32), the current transformer group D (23),
A wherein branch is sequentially connected once fuse A (26) and voltage transformer C (27), and in addition a branch is connected in turn
Breaker C (28), current transformer group F (29), HV Auxiliary Transformer (11), high factory become neutral resistance D (31) and
Current transformer B (32).
6. the novel circuit configuration of electric main power connection in power plant according to claim 5, which is characterized in that the electric current is mutual
Between sensor group C (19) and current transformer group D (23) also exciting transformer (10), exciting transformer (10) are connected with through branch
Place branch circuit parallel connection has two other branch, a wherein branch road to be connected with a fuse B (34) and mutual induction of voltage
Device A (36), another branch road are connected with a fuse C (35) and voltage transformer B (37).
7. the novel circuit configuration of electric main power connection in power plant according to claim 6, which is characterized in that further include two groups
Power input/the output system (38) being connect with power grid (5), the power input/output system (38) includes connected in sequence
Earthing switch C (56), breaker D (40), current transformer group G (41), disconnecting switch D (42), earthing switch D (57) and three-phase
Power input/output end (43), the earthing switch C (56) are also associated with disconnecting switch C (39) and isolation through being arranged in parallel
Switch c (60), the disconnecting switch C (39) connect with busbar A (501), and the disconnecting switch c (60) connects with busbar B (502)
It connects.
8. the novel circuit configuration of electric main power connection in power plant according to claim 7, which is characterized in that the idle benefit
It includes the voltage transformer (45) of capacitance (44) and setting on capacitance (44), the busbar A (501) and busbar B to repay device (8)
(502) one group of reactive power compensator (8) is parallel on respectively, between the current transformer group E (24) and earthing switch A (12)
Also it is parallel with one group of reactive power compensator (8), the branch between disconnecting switch D (42) and three phase mains input/output terminal (43)
On be also parallel with one group of reactive power compensator (8).
9. the novel circuit configuration of electric main power connection in power plant according to claim 8, which is characterized in that further include lightning protection
Protective device (46), the lightning protection device (46) include arrester A (47), arrester B (48), arrester C (49) and keep away
Thunder device D (58), the arrester A (47) are arranged in parallel with exciting transformer (10), the arrester B (48) and voltage transformer
C (27) is arranged in parallel, the arrester C (49) be connected to disconnecting switch D (42) and three phase mains input/output terminal (43) it
Between, the arrester D (58) is set between current transformer group E (24) and earthing switch A (12).
10. the novel circuit configuration of electric main power connection in power plant according to claim 9, which is characterized in that further include mother
Join breaker (50), the busbar breaker (50) connect with power grid (5), and the busbar breaker (50) includes connected in sequence
Disconnecting switch E (51), breaker E (52), current transformer group H (53) and disconnecting switch F (54), wherein disconnecting switch E (51)
It is connect with busbar A (501), disconnecting switch F (54) is connect with busbar B (502).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810581734.1A CN108808729A (en) | 2018-06-07 | 2018-06-07 | A kind of novel circuit configuration of electric main power connection in power plant |
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| CN201810581734.1A CN108808729A (en) | 2018-06-07 | 2018-06-07 | A kind of novel circuit configuration of electric main power connection in power plant |
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| CN112103919A (en) * | 2020-09-11 | 2020-12-18 | 西安交通大学 | Three-layer relay protection system, device and method for hybrid distribution transformer |
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