CN103414273A - Method for designing wiring of 6kV double-speed motor matched with large circulating water pump of nuclear power plant - Google Patents
Method for designing wiring of 6kV double-speed motor matched with large circulating water pump of nuclear power plant Download PDFInfo
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- CN103414273A CN103414273A CN2013102996915A CN201310299691A CN103414273A CN 103414273 A CN103414273 A CN 103414273A CN 2013102996915 A CN2013102996915 A CN 2013102996915A CN 201310299691 A CN201310299691 A CN 201310299691A CN 103414273 A CN103414273 A CN 103414273A
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Abstract
The invention belongs to a nuclear power plant design technology, and particularly relates to a method for designing wiring of a 6kV double-speed motor matched with a large circulating water pump of a nuclear power plant. The method includes the steps that firstly the power, the rotating speed and the number of poles, respectively required in summer and in winter, of the motor are determined according to the shaft power and the rotating speed of the circulating water pump; then the speed regulating mode that the number of the poles of a stator winding of the motor is changed is adopted, and different switches in a set of 6kV switch cabinets which are connected with the stator winding of the motor through cables are switched, so that the number of the poles of the motor is changed, and then the rotating speed of the motor is changed. According to the method, the requirement for regulating the speed and the flow of the large circulating water pump of the nuclear power plant is met, and then the efficient and energy-saving effects are achieved.
Description
Technical field
The invention belongs to the nuclear power station designing technique, be specifically related to the supporting 6kV double-speed motor of a kind of nuclear power station System in Large Circulating Water Pump wiring design method.
Background technology
Sea water circulating pump is the visual plant in nuclear power station three loops, and its function is to provide essential cooling water for the condenser of turbo generator set and auxiliary cooling water system, and these heat loads are transported to ultimate heat sink-seawater.The circulating water pump of nuclear power station, due to its particularity, capacity is usually much larger than the circulating water pump of thermal power plant, and its necessary electromotor capacity is approximately 5000～6000kW according to the difference of unit capacity.Due to winter of certain areas, summer temperature difference of seawater larger, cause the needed circulating cooling seawater flow of Various Seasonal that bigger difference is also arranged, if select circulating water pump by required maximum stream flow, certainly will cause heat load when some season to lose too much, the power consumption consumed simultaneously increases, and causes great energy waste.
For addressing this problem, need take measures for required different seawater flows of winter, summer.Through serious analysis and investigation in many ways, in the two schemes of two circulating water pumps that adopt the different capabilities configuration and necessary electromotor and the supporting double-speed motor of employing separate unit circulating water pump, finally selected the latter.But this scheme also has larger difficulty, because circulating water pump necessary electromotor capacity is very large, need select the 6kV Medium-voltage motor, and China does not have the manufacturer's standard of 6kV double-speed motor, and the domestic precedent that does not also produce product, all needs develops voluntarily.
In addition; according to GB/T14285-2006 " relaying protection and automatic safety device technical regulation "; the above motor of 2MW should be installed longitudinal differential protection; but the special wiring form due to double-speed motor; can't use usual way, the neutral point side joint current transformer namely drawn is outside realized the differential protection to motor.This problem has brought certain difficulty also for the development of motor, needs to change thinking, tries every possible means to solve this difficult point from the design of motor winding.
Summary of the invention
The object of the present invention is to provide a kind of wiring design method that realizes the running of motor double speed by one group of different winding coupling of 6kV switch cubicle connection motor, to meet the supporting needs of System in Large Circulating Water Pump and to realize the target that flow changes.
Technical scheme of the present invention is as follows: at first the supporting 6kV double-speed motor of a kind of nuclear power station System in Large Circulating Water Pump wiring design method, the method determine that according to shaft power and the rotating speed of circulating water pump motor is at required power, rotating speed and the number of poles of winter or summer difference; Then adopt the mode of speed regulation that motor stator winding is changed to number of poles, by the switching of different switches in the one group of 6kV switch cubicle be connected from motor stator winding through cable, realize the change of motor pole number, thereby change motor speed.
Further, the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as above wiring design method, wherein, the change of described motor pole number is to realize by motor stator winding is switched between delta connection and double star connection mode; Every phase average of described motor stator winding is divided into 2 groups, when delta connection, and 2 windings in series of every phase, the winding number of poles is more, the motor low-speed running; When double star connects, 2 winding parallels of every phase, the winding number of poles is less, and motor runs up.
Further, the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as above wiring design method, wherein, in described one group of 6kV switch cubicle, feed isolating switch is set, and high-speed cruising feeder switch, low cruise feeder switch, neutral point connecting valve; Described high-speed cruising feeder switch is connected with motor stator winding by cable respectively with the low cruise feeder switch, and the outlet of low cruise feeder switch also is connected with the neutral point connecting valve; When low cruise feeder switch closure, when high-speed cruising feeder switch and neutral point connecting valve disconnect, motor stator winding connection triangular in shape; When high-speed cruising feeder switch and neutral point connecting valve closure, when the low cruise feeder switch disconnected, motor was double star and connects.
Further; the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as above wiring design method; wherein; when motor stator winding connection triangular in shape; 2 windings in series of every phase; in every phase stator winding, 1 current transformer of installing completes the short trouble protection to motor under the low-speed running state together with the first current transformer in being installed in the 6kV switch cubicle and the first differential relay, and described the first current transformer and the first differential relay are arranged in low cruise feeder switch cabinet.
Further; the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as above wiring design method; wherein; when motor stator winding is the double star connection; 2 winding parallels of every phase; in every phase stator winding, 2 current transformers of installing complete the short trouble protection to motor under the state of running up together with the second current transformer in being installed in the 6kV switch cubicle and the second differential relay, and described the second current transformer and the second differential relay are arranged in high-speed cruising feeder switch cabinet.
Beneficial effect of the present invention is as follows: the present invention is directed to the domestic present situation that there is no at present 6kV double-speed motor approved product; provide a kind of and connected by one group of 6kV switch cubicle the wiring design that the different winding coupling of motor realizes the running of motor double speed; and 2 groups of current transformers are arranged in motor stator winding; with the current transformer and the differential relay that are contained in the 6kV switch cubicle, jointly realize the differential protection of motor under different rotating speeds, to meet the supporting needs of System in Large Circulating Water Pump and to realize the target that flow changes.The present invention has met the speed governing of nuclear power station System in Large Circulating Water Pump and has realized the requirement of Flow-rate adjustment, thereby has realized energy-efficient effect.
The accompanying drawing explanation
Fig. 1 be the specific embodiment of the invention the motor winding connection and with the connection diagram of switch cubicle.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The realization of technical solution of the present invention is divided into following three parts:
First is the design of the parameter of electric machine and stator winding wiring.At first need to closely cooperate with the Process of Water Circulating System specialty, according to seawater flow and the recirculated water pump lift that the winter or summer circulation needs, calculate shaft power and the rotating speed of circulating water pump, and this is offered to electric specialty as the design input.According to the parameter of pump, calculative determination goes out motor in required power P and the rotation speed n of winter or summer difference, according to rotating speed formula n=60f (1-s)/p, can calculate the number of poles p of motor correspondence under different rotating speeds, and wherein f is frequency, and s is revolutional slip.
After parameter is selected, the wiring of motor stator winding is designed, according to the principle of pole change induction motor speed governing, adopted the method for delta connection with double star connection phase co-conversion.While being delta connection, the winding number of poles is more, low cruise; When changing over the double star connection, the winding number of poles is relatively less, high-speed cruising.So far, the design parameter of motor and connection type are substantially definite.
Second portion is the measure for realizing that the motor Pole-changing switchover is taked.Increase by one group of 6kV switch cubicle, wherein two outlet switchs are connected to respectively two groups of terminals (6 leading-out terminals of motor winding must lead in the terminal box on electric machine casing) of motor by cable, simultaneously the common port of motor Y-Y connection is led to wherein switch cubicle, and by after switch, being joined together to form neutral point.By the switching of different 6kV switches, can realize like this pole changing of motor.
Third part is the measure of taking for the differential protection of realizing motor.Because motor needs the double speed running, so correspondingly should being set, 2 cover differential protections protect respectively the motor under different running speeds.Because of the neutral point side installing current transformer that can't draw outside motor; during the design motor, 2 groups of current transformers are arranged on stator winding; and secondary side is led to the dedicated terminals case of motor housing; by control cables, current signal is caused respectively in corresponding 6kV switch cubicle like this; with the current transformer signal be arranged in switch cubicle, together access differential relay, complete the phase fault protection to motor stator winding and lead-out wire.
Embodiment
Take certain nuclear power engineering is example, and the required seawater flow of circulation winter or summer is respectively 14m
3/ s and 19.9m
3/ s, the shaft power of pump should be 2361kW, 206rpm and 4134kW, 248rpm with rotating speed mutually at winter or summer as calculated.According to this technological parameter, match and the design driven motor, in design process, find, because the rotating speed of pump is too low, if direct gas-distributing motor, will certainly increase the number of poles of motor, give the very large difficulty of Design and manufacture increase of motor, for this reason, through lateral thinking, taked to increase the scheme of reduction gear box between the pump housing and motor.Through the coupling of parameter between the calculating to the parameter of electric machine and three, the 6kV motor of the supporting circulating water pump of final design is respectively 2700kW, 497rpm, 12 utmost points and 4650kW, 595rpm, 10 utmost points at power, rotating speed and the number of poles of winter or summer.
After parameter is selected, the wiring of motor stator winding is designed, adopt the variable-pole speed-regulating method of delta connection and double star connection phase co-conversion.As shown in Figure 1, during design motor winding, every phase winding is divided into to 2 groups, mutually connects by order in figure, draw and can obtain delta connection (2 windings in series of every phase) and double star connection (2 winding parallels of every phase) from the difference end.During delta connection, the winding number of poles is 12 utmost points, low cruise; When changing over the double star connection, the winding number of poles is 10 utmost points, high-speed cruising.
For realizing the motor Pole-changing switchover, one group of 6kV switch cubicle is set, as shown in the figure, wherein the QS1 in switch cubicle LGEA1 is feed isolating switch, QF2 in QF1 in the LGEA2 cabinet and LGEA3 cabinet is respectively high-speed cruising feeder switch and low cruise feeder switch, and the QF3 in the LGEA4 cabinet is the neutral point connecting valve.From QF1 and QF2 respectively outgoing cable be connected to as shown in drawings two groups of terminals of motor, simultaneously by the common port of motor Y-Y connection (QF2 switch exit) outgoing cable to wherein LGEA4 cabinet, and be joined together to form neutral point by QF3.When QF2 closure, QF1 and QF3 disconnected, the motor triangularity connect, low cruise; When QF1 and QF3 closure, when QF2 disconnected, motor became double star to connect, high-speed cruising; It should be noted that and should guarantee that QF2 and QF1, QF3 can not be closed simultaneously by electrical interlock.Like this, by the switching of different 6kV switches, namely realized the pole changing of motor.
For realizing the differential protection of motor, 2 groups of current transformers are arranged on stator winding, when motor was delta connection, 2 windings in series of every phase, installed 1 current transformer, mutually as 871C～873C in figure therefore every; When motor was the double star connection, 2 winding parallels of every phase, installed 2 current transformers, mutually as 871A～873A in figure and 871B～873B therefore every.These 2 groups of Current Transformer Secondary side current signals are connected in LGEA2 and LGEA3 cabinet by cable respectively; with the first current transformer and the first differential relay that are arranged in switch cubicle LGEA3, and the second current transformer and the second differential relay that are arranged in switch cubicle LGEA2 form the protection of the short trouble under different rotating speeds to motor together.
When motor stator winding connection triangular in shape; 2 windings in series of every phase, in every phase stator winding, 1 current transformer of installing completes the short trouble protection to motor under the low-speed running state together with the first current transformer in being installed in switch cubicle LGEA3 and the first differential relay.When motor stator winding is the double star connection; 2 winding parallels of every phase, in every phase stator winding, 2 current transformers of installing complete the short trouble protection to motor under the state of running up together with the second current transformer in being installed in switch cubicle LGEA2 and the second differential relay.
Above-described embodiment connects by one group of 6kV switch cubicle the wiring design that the different winding coupling of motor realizes the running of motor double speed; and 2 groups of current transformers are arranged in motor stator winding; with the current transformer and the differential relay that are contained in the 6kV switch cubicle, jointly realize the differential protection of motor under different rotating speeds, to meet the supporting needs of System in Large Circulating Water Pump and to realize the target that flow changes.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump wiring design method is characterized in that: at first the method determines that according to the shaft power of circulating water pump and rotating speed motor is at winter or summer required power, rotating speed and number of poles respectively; Then adopt the mode of speed regulation that motor stator winding is changed to number of poles, by the switching of different switches in the one group of 6kV switch cubicle be connected from motor stator winding through cable, realize the change of motor pole number, thereby change motor speed.
2. the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as claimed in claim 1 wiring design method is characterized in that: the change of described motor pole number is to realize by motor stator winding is switched between delta connection and double star connect mode; Every phase average of described motor stator winding is divided into 2 groups, when delta connection, and 2 windings in series of every phase, the winding number of poles is more, the motor low-speed running; When double star connects, 2 winding parallels of every phase, the winding number of poles is less, and motor runs up.
3. the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as claimed in claim 2 wiring design method, it is characterized in that: in described one group of 6kV switch cubicle, feed isolating switch is set, and high-speed cruising feeder switch, low cruise feeder switch, neutral point connecting valve; Described high-speed cruising feeder switch is connected with motor stator winding by cable respectively with the low cruise feeder switch, and the outlet of low cruise feeder switch also is connected with the neutral point connecting valve; When low cruise feeder switch closure, when high-speed cruising feeder switch and neutral point connecting valve disconnect, motor stator winding connection triangular in shape; When high-speed cruising feeder switch and neutral point connecting valve closure, when the low cruise feeder switch disconnected, motor was double star and connects.
4. the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as claimed in claim 3 wiring design method; it is characterized in that: when motor stator winding connection triangular in shape; 2 windings in series of every phase; in every phase stator winding, 1 current transformer of installing completes the short trouble protection to motor under the low-speed running state together with the first current transformer in being installed in the 6kV switch cubicle and the first differential relay, and described the first current transformer and the first differential relay are arranged in low cruise feeder switch cabinet.
5. the supporting 6kV double-speed motor of nuclear power station System in Large Circulating Water Pump as claimed in claim 3 wiring design method; it is characterized in that: when motor stator winding is the double star connection; 2 winding parallels of every phase; in every phase stator winding, 2 current transformers of installing complete the short trouble protection to motor under the state of running up together with the second current transformer in being installed in the 6kV switch cubicle and the second differential relay, and described the second current transformer and the second differential relay are arranged in high-speed cruising feeder switch cabinet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102996915A CN103414273A (en) | 2013-07-17 | 2013-07-17 | Method for designing wiring of 6kV double-speed motor matched with large circulating water pump of nuclear power plant |
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| CN2013102996915A CN103414273A (en) | 2013-07-17 | 2013-07-17 | Method for designing wiring of 6kV double-speed motor matched with large circulating water pump of nuclear power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333164A (en) * | 2014-11-05 | 2015-02-04 | 国家电网公司 | Power plant circulating water pump motor two-speed transformation method |
| CN109412115A (en) * | 2018-08-07 | 2019-03-01 | 华电邹县发电有限公司 | A kind of novel two-speed motor differential relaying algorithm |
| CN110571989A (en) * | 2019-09-26 | 2019-12-13 | 上海电机集团梅山电机维修有限公司嘉兴分公司 | Double-speed transformation method for motor |
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| CN200976489Y (en) * | 2006-11-17 | 2007-11-14 | 贵阳铝镁设计研究院 | Rectifier transformer transverse bracing differential current protection apparatus |
| CN201536344U (en) * | 2009-09-27 | 2010-07-28 | 武汉金路达电机有限公司 | On-line electric pole-changing speed regulation control circuit for two-speed motor |
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| CN200976489Y (en) * | 2006-11-17 | 2007-11-14 | 贵阳铝镁设计研究院 | Rectifier transformer transverse bracing differential current protection apparatus |
| CN201536344U (en) * | 2009-09-27 | 2010-07-28 | 武汉金路达电机有限公司 | On-line electric pole-changing speed regulation control circuit for two-speed motor |
| CN102904408A (en) * | 2011-07-28 | 2013-01-30 | *** | Pole-changing and speed-changing wind power generation system of synchronous motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333164A (en) * | 2014-11-05 | 2015-02-04 | 国家电网公司 | Power plant circulating water pump motor two-speed transformation method |
| CN109412115A (en) * | 2018-08-07 | 2019-03-01 | 华电邹县发电有限公司 | A kind of novel two-speed motor differential relaying algorithm |
| CN109412115B (en) * | 2018-08-07 | 2020-01-24 | 华电邹县发电有限公司 | Novel differential protection algorithm for double-speed motor |
| CN110571989A (en) * | 2019-09-26 | 2019-12-13 | 上海电机集团梅山电机维修有限公司嘉兴分公司 | Double-speed transformation method for motor |
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Application publication date: 20131127 |