CN116470643A - Remote power distribution system for track traffic motor load - Google Patents
Remote power distribution system for track traffic motor load Download PDFInfo
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- CN116470643A CN116470643A CN202310444482.9A CN202310444482A CN116470643A CN 116470643 A CN116470643 A CN 116470643A CN 202310444482 A CN202310444482 A CN 202310444482A CN 116470643 A CN116470643 A CN 116470643A
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- 238000004804 winding Methods 0.000 claims abstract description 64
- 238000005286 illumination Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 101100130927 Caenorhabditis elegans moa-2 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000887424 Mus musculus G-protein coupled receptor 143 Proteins 0.000 description 1
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a remote power distribution system for rail transit motor loads, and relates to the technical field of rail transit low-voltage power distribution. The section and the investment of the low-voltage distribution cable are further reduced by adjusting the form of a distribution transformer of the substation and a low-voltage distribution system, and the problem of remote distribution is solved. The system comprises: the device comprises a medium-voltage power supply, a medium-voltage distribution device, a medium-voltage/low-voltage three-winding distribution transformer, a 0.4kV distribution device and a 0.69kV distribution device, wherein the medium-voltage power supply is connected with the medium-voltage distribution device, the medium-voltage distribution device is connected with a medium-voltage input winding of the medium-voltage/low-voltage three-winding distribution transformer, and two low-voltage independent output windings of the medium-voltage/low-voltage three-winding distribution transformer are respectively connected with the 0.4kV distribution device and the 0.69kV distribution device; the 0.4kV power distribution device is used for distributing power for illumination and weak current loads, and the 0.69kV power distribution device is used for distributing power for motor loads.
Description
Technical Field
The invention relates to the technical field of rail transit low-voltage power distribution, in particular to a remote power distribution system for rail transit motor loads.
Background
Two AC35 (10)/0.4 kV distribution transformers are generally adopted in a distribution substation of the existing low-voltage distribution system of the rail transit to distribute power to low-voltage loads, and the low-voltage distribution system adopts AC220V/380V to distribute power to motor loads. When in remote power distribution, the section of a power distribution cable between a low-voltage power distribution cabinet of a substation and motor equipment is large, the manufacturing cost is high, and the electric energy loss of a cable line is high. Meanwhile, the rail transit station pipeline is complex, the space is narrow, and the large-section cable is difficult to lay, so that the site construction is difficult.
In the existing power distribution system of rail transit, the load of motor equipment, the load of illumination and the load of weak current equipment are distributed on the same AC0.4kV power distribution bus. When the motor is started, the stable operation of sensitive loads such as illumination, weak current and the like is influenced. In order to reduce the influence on lighting and weak current equipment, the voltage of an AC0.4kV distribution bus needs to be controlled to be more than 85% when a motor is started.
Disclosure of Invention
In order to solve the technical problems, the invention provides a remote power distribution system for a track traffic motor load, which solves the problem of remote power distribution by adjusting the form of a power substation distribution transformer and a low-voltage power distribution system in track traffic.
The invention provides a remote power distribution system for rail transit motor load, which comprises:
the three-winding type power distribution device comprises a medium-voltage power supply, a medium-voltage distribution device, a medium-voltage/low-voltage three-winding distribution transformer, a 0.4kV distribution device and a 0.69kV distribution device, wherein the medium-voltage power supply is connected with the medium-voltage distribution device, the medium-voltage distribution device is connected with a medium-voltage input winding of the medium-voltage/low-voltage three-winding distribution transformer, and two low-voltage independent output windings of the medium-voltage/low-voltage three-winding distribution transformer are respectively connected with the 0.4kV distribution device and the 0.69kV distribution device;
the 0.4kV power distribution device is used for distributing power for illumination and weak current loads, and the 0.69kV power distribution device is used for distributing power for motor loads.
Preferably, the voltage value of the medium-voltage power supply is 10kV, the medium-voltage distribution device adopts a 10kV medium-voltage distribution device, and the medium-voltage/low-voltage three-winding distribution transformer adopts a 10kV/0.4kV/0.69kV three-winding distribution transformer; or, the voltage value of the medium-voltage power supply is 35kV, the medium-voltage distribution device adopts a 35kV medium-voltage distribution device, and the medium-voltage/low-voltage three-winding distribution transformer adopts a 35kV/0.4kV/0.69kV three-winding distribution transformer.
Preferably, a main wiring form of a medium-voltage bus of the medium-voltage distribution device is a single bus sectional strip connection form, and a spare power automatic switching device is arranged; the main wiring form of the 0.4kV bus of the 0.4kV power distribution device is a single bus sectional area connection form and is provided with a standby power automatic switching device, and the main wiring form of the 0.69kV bus of the 0.69kV power distribution device is a single bus sectional area connection form and is provided with a standby power automatic switching device.
Preferably, the 0.69kV bus of the 0.69kV power distribution device comprises a 0.69kV primary-secondary load bus and a 0.69kV tertiary load bus; the 0.4kV bus of the 0.4kV power distribution device comprises a 0.4kV primary-secondary load bus and a 0.4kV tertiary load bus.
Preferably, the number of the medium-voltage/low-voltage three-winding distribution transformers is at least two, and the normal operation modes of the sectional bus of the medium-voltage bus, the sectional bus of the 0.4kV bus and the sectional bus of the 0.69kV bus are all in split operation.
Preferably, the 0.4kV power distribution device is used for distributing power for lighting and weak current loads, and the voltage of a power distribution system is AC220V/380V; the 0.69kV power distribution device is used for distributing power to motor loads, and the voltage of a power distribution system is 380V/660V.
Preferably, the medium-voltage input winding of the medium-voltage/low-voltage three-winding distribution transformer adopts triangular wiring, and the two low-voltage independent output windings adopt star-shaped wiring.
Preferably, the motor stator winding is star-connected.
Preferably, the motor load includes a fan, a water pump, an air conditioning unit, and a water chiller.
Preferably, the medium voltage distribution device, medium voltage/low voltage three winding distribution transformer, 0.4kV distribution device and 0.69kV distribution device are all located within the substation area.
Compared with the prior art, the remote power distribution system for the rail transit motor load has the following beneficial effects: the invention adopts a medium-voltage/low-voltage three-winding distribution transformer in a rail transit substation, wherein the medium-voltage side of the distribution transformer adopts traditional medium-voltage input, and two low-voltage independent output windings of the distribution transformer are respectively connected with a 0.4kV distribution device and a 0.69kV distribution device, wherein the 0.4kV distribution device is used for distributing power for lighting and weak current loads and keeps consistent with the traditional distribution system; the 0.69kV power distribution device is used for distributing power to the motor load, and improves the voltage level of a power distribution system. Meanwhile, the load of the motor, the illumination and the weak current load are respectively positioned on different power distribution devices, and the motor cannot influence sensitive load equipment such as illumination, weak current and the like when being started. Therefore, when the motor is started, the voltage of the AC0.69kV bus can be controlled according to 80%, and the section and investment of the low-voltage distribution cable are further reduced. The section of a distribution cable between the low-voltage switch cabinet of the substation and motor equipment is greatly reduced, the investment is reduced, the electric energy loss of a line is reduced, the difficulty in laying the cable in the track traffic engineering is reduced, and the development direction of cost reduction, synergy and green double carbon is met.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of a remote power distribution system for rail transit motor load according to an embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a motor load side power distribution system provided by an embodiment of the present invention;
FIG. 3 (a) shows a schematic diagram of a delta connection used in prior art motor windings;
FIG. 3 (b) shows a prior art delta connection schematic for a motor winding;
FIG. 4 (a) shows a schematic diagram of star wiring employed by a motor winding provided by an embodiment of the present invention;
fig. 4 (b) shows a schematic diagram of star connection used for the motor winding according to the embodiment of the present invention.
Detailed Description
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The term "plurality" as used in this embodiment means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone. The words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration, intended to present concepts related in a specific manner, and should not be interpreted as being preferred or advantageous over other embodiments or designs.
Stations and sections in the track traffic engineering are distributed in a linear mode, the load capacity of motors in the whole line and the stations is large, the number of devices is large, and the electricity consumption requirement of remote power distribution is large. When in remote power distribution, the section of the power distribution cable is large, the electric energy loss is high, the laying difficulty is large, and the one-time construction investment is high.
Based on the above, the embodiment of the invention provides a rail transit motor load remote power distribution system. Fig. 1 shows a schematic diagram of a remote power distribution system for rail transit motor load according to an embodiment of the present invention. As shown in fig. 1, the system includes: 35 The (10) kV medium voltage power supplies 10 and 35 (10) kV medium voltage distribution device 20, at least two 35 (10) kV/0.4kV/0.69kV medium voltage/low voltage three-winding distribution transformers 30, 0.4kV distribution device 40 and 0.69kV distribution device 50, the 35 (10) kV medium voltage power supply 10 is connected with the 35 (10) kV medium voltage distribution device 20, the 35 (10) kV medium voltage distribution device 20 is connected with the medium voltage input winding of the 35 (10) kV/0.4kV/0.69kV medium voltage/low voltage three-winding distribution transformer 30 in a triangular mode, and two low voltage independent output windings of the 35 (10) kV/0.4kV/0.69kV medium voltage/low voltage three-winding distribution transformer 30 are respectively connected with the 0.4kV distribution device 40 and the 0.69kV distribution device 50 in a star mode. The 0.4kV power distribution device 40 is used for distributing power for lighting and weak current loads, the power distribution system voltage is AC220V/380V, the 0.69kV power distribution device 50 is used for distributing power for motor loads, and the power distribution system voltage is AC380V/660V. It should be understood that in the embodiment of the invention, the wiring mode of the motor stator winding is star wiring, and the motor load comprises a fan, a water pump, an air conditioning unit and a water chilling unit. The 35 (10) kV medium voltage distribution device 20, 35 (10) kV medium voltage/low voltage three-winding distribution transformer 30, the 0.4kV distribution device 40 and the 0.69kV distribution device 50 are all located in the power substation area.
As shown in fig. 1, the main wiring form of a medium voltage bus of the 35 (10) kV medium voltage distribution device 20 is a single bus segment with a connection form, and a spare power automatic switching device is arranged, namely, the 35 (10) kV bus is divided into two 35 (10) kV bus segments; the main wiring form of the 0.4kV bus of the 0.4kV power distribution device 40 is a single bus section strip connection form, and a spare power automatic switching device is arranged, namely, the 0.4kV bus is divided into two 0.4kV bus sections, the main wiring form of the 0.69kV bus of the 0.69kV power distribution device 50 is a single bus section strip connection form, and the spare power automatic switching device is arranged, namely, the 0.69kV bus is divided into two 0.69kV bus sections. The normal operation modes of the sectional bus of the medium-voltage bus, the sectional bus of the 0.4kV bus and the sectional bus of the 0.69kV bus are all in line operation, namely, the two 10kV bus sections, the two 0.4kV bus sections and the two 0.69kV bus sections are all in line operation when in normal operation.
As shown in fig. 1, the 0.69kV bus of the 0.69kV distribution device 50 includes a 0.69kV primary-secondary load bus and a 0.69kV tertiary load bus; the 0.4kV bus of the 0.4kV power distribution device 40 comprises a 0.4kV primary-secondary load bus and a 0.4kV tertiary load bus.
According to practical situations, the voltage class of the medium-voltage power supply in the embodiment is 10kV, and correspondingly, the 35kV can be used, the 10kV medium-voltage power supply 10 is changed into a 35kV medium-voltage power supply, the medium-voltage power distribution device is adjusted to be a 35kV medium-voltage power distribution device by the 10kV medium-voltage power distribution device 20, and the medium-voltage/low-voltage three-winding power distribution transformer is adjusted to be at least two 35kV/0.4kV/0.69kV medium-voltage/low-voltage three-winding power distribution transformers by at least two 10kV/0.4kV/0.69kV medium-voltage/low-voltage three-winding power distribution transformers 30.
As shown in fig. 1, a remote power distribution system for rail transit motor load comprises the following components:
1. a medium-voltage side power distribution system of a power supply,
the medium voltage side of the power supply is located in the 10kV bus and above as in figure 1. As shown in fig. 1, the medium voltage power supply 10 may be AC10kV or AC35kV. The medium voltage distribution device 20 of the substation is connected to the medium voltage power supply 10, and the medium voltage distribution device 20 may be an AC10kV bus or an AC35kV bus. The AC35 (10) kV bus adopts a sectional single bus and bus sectional interconnection switch mode, for example, a 1# incoming line switch 101, a 2# incoming line switch 102, a 1# outgoing line switch 103, a 2# outgoing line switch 104 and the AC35 (10) kV bus sectional interconnection switch 100 all adopt circuit breakers.
As shown in fig. 1, a 1# incoming line of an AC35 (10) kV bus is provided with a live display 1111, a current transformer 111 for measurement and protection, and an isolation grounding switch 1011 which is convenient for maintenance and isolation; the 2# incoming line of the AC35 (10) kV bus is provided with a live display 1112, a current transformer 112 for measurement and protection, and an isolation grounding switch 1021 which is convenient for overhaul and isolation; the No. 1 outlet of the AC35 (10) kV bus is provided with a live display 1113, a current transformer 113 for measurement and protection and an isolation grounding switch 1031 which is convenient to overhaul and isolate; the 2# outlet of the AC35 (10) kV bus is provided with a live display 1112, a current transformer 112 for measurement and protection, and an isolation grounding switch 1021 for convenient maintenance and isolation.
Under normal conditions, a main transformer substation of a rail transit line or a power supply switching station respectively feeds out two-circuit AC35kV or AC10kV power supplies for supplying power to the transformer substation, the two-circuit power supplies are respectively connected to two sections of different buses (I section and II section), the sectional contact switch 100 between the I section bus and the II section bus is in an off state, and the two power supplies work in normal separate columns. And lightning arresters and voltage transformers are respectively arranged on the AC35 (10) kVI section bus and the AC35 (10) kVII section bus. For example, an arrester MOA1 and a voltage transformer PT1 are arranged on an AC35 (10) kVI section bus; an arrester MOA2 and a voltage transformer PT2 are arranged on the AC35 (10) kVII section bus. Bus connection cabinets are also arranged on the AC35 (10) kVI section bus and the AC35 (10) kVII section bus, namely, a current transformer 115, a live display 1115, an AC35 (10) kV bus sectionalized connection switch 100, an isolation grounding switch 1001 and an isolation grounding switch 1002 which are positioned on the upper half part between the AC35 (10) kVI section bus and the AC35 (10) kVII section are all positioned in the bus connection cabinets.
The power supply medium-voltage side part is a traditional typical scheme, adjustment is not needed, and engineering feasibility and adaptability of the scheme are ensured.
2. Power supply low-voltage side power distribution system
The low-voltage distribution side of the power supply corresponds to an AC35 (10) kV feeder line and links below in FIG. 1, and comprises a distribution transformer, a low-voltage distribution bus, various levels of switch equipment and the like.
A. Three-winding distribution transformer, low-voltage distribution main wiring and operation mode
The distribution transformer of the substation adopts two medium voltage/low voltage three-winding distribution transformers 30, transformer voltage AC35 (10) kV/0.4kV/0.69kV, two low voltage independent output winding outgoing lines of the transformer are respectively connected to AC0.4kV and AC0.69kV low voltage distribution buses, incoming line switches 401, 402, 501 and 502 are respectively arranged at incoming lines of the AC0.4kV and AC0.69kV low voltage distribution buses, a sectionalized tie switch 403 is arranged between two sections of AC0.4kV low voltage buses at the same voltage level, sectionalized tie switches 503 are arranged between two sections of AC0.69kV low voltage buses at the same voltage level, and the incoming line switches 401, 402, 501 and 502 and sectionalized tie switches 403 and 503 are all circuit breakers, so that different distribution requirements of first, second and third-level loads in the track traffic engineering can be met.
The AC0.4kV low-voltage bus is connected to a drawer type low-voltage distribution switch cabinet which is responsible for distributing loads of lighting and weak current equipment, and a feeder circuit breaker, a current transformer for metering, an instrument and the like are arranged in a feeder drawer of the switch cabinet. The AC0.69kV low-voltage bus is connected to a drawer type low-voltage distribution switch cabinet which is responsible for distributing power to loads of power equipment such as motors, and a feeder circuit breaker, a current transformer for metering, an instrument and the like are arranged in a feeder drawer of the switch cabinet. In addition, in order to facilitate operation management and control, the inner part of each section of AC0.69kV bus is divided into a two-stage load bus and a three-stage load bus. For example, the 0.4kVI section bus is internally divided into a primary load 404 and a tertiary load 405, and the 0.4kVII section bus is internally divided into a primary load 406 and a tertiary load 407; the 0.69kVI section bus is internally divided into a first-stage load 504 and a third-stage load 505, and the 0.69kVII section bus is internally divided into a first-stage load 506 and a third-stage load 507.
Under normal conditions, I, II-section bus incoming line side circuit breakers of AC0.4kV and AC0.69kV are closed, namely, AC0.4kVI-section bus incoming line side circuit breaker 401, AC0.4kVII-section bus incoming line side circuit breaker 402, AC0.69 kVI-section bus incoming line side circuit breaker 501 and AC0.69 kVII-section bus incoming line side circuit breaker 502 are all closed, and AC0.4kVI and II-section bus section connection switch 403 are opened, and AC0.69kVI and II-section bus section connection switch 503 are opened, so that AC0.4kV two-section bus and AC0.69kV two-section bus are operated in equal rows. When a distribution transformer of the substation breaks down and runs, all three-level loads on AC0.4kV and AC0.69kV buses are cut off, a I, II-section bus section interconnection switch 403 of AC0.4kV and a I, II-section bus section interconnection switch 503 of AC0.69kV are closed, and the other distribution transformer is used for bearing all one-level and two-level loads within the range of the substation.
B. Primary device and component parameters
In the track traffic engineering, the insulation voltage adopted by the existing power distribution cabinet is 1kV, the insulation voltage value meets the requirements on an AC220/380V power distribution system and an AC380/660V power distribution system, the creepage distance and electromagnetic compatibility requirements of the power distribution cabinet of the AC220/380V power distribution system and the AC380/660V power distribution system are consistent, and the power distribution cabinet has operation precedents in industries such as industry and mining, papermaking and the like. The equipment and the elements required by the remote power distribution system for the rail transit motor load have matching products in the existing market, so that the feasibility of the scheme provided by the invention in rail transit engineering is ensured.
3. Load side power distribution system
1) Motor equipment control cabinet part
As shown in fig. 2, the main components in the motor equipment control cabinet 10 are consistent with a traditional ac0.4kv power distribution system, and are composed of a circuit breaker 1, a contactor 2, a thermal relay 3, an instrument and the like. When the AC380/660V system supplies power, all components are mature, and are not discussed one by one in detail.
When the AC380/660V power distribution system is adopted, the power supply of the control system in the control cabinet adopts AC220V, which is consistent with the power supply of the control system adopting the traditional AC220/380V power distribution system scheme, because the AC220V power supply of the control system is generally obtained by arranging an isolation transformer in the control cabinet.
2) Power distribution and control cable
The track traffic adopts a copper core low-voltage halogen-free flame-retardant (fire-resistant) cable with the rated voltage of 0.6/1kV, and the control cable adopts a copper core low-voltage halogen-free flame-retardant (fire-resistant) control cable with the rated voltage of 450/750V. Meets the power supply requirement of the AC660V/380V system.
3) Motor apparatus
A. Influence factor of electromagnetic power and electromagnetic torque of motor
The calculation of the electromagnetic power, electromagnetic torque, rotor coil current of the motor is as follows:
combining formulas (1), (2)
Wherein P is em Electromagnetic power of the motor; t (T) em Is electromagnetic torque; i' 2 Rotor current of the motor gamma-shaped equivalent circuit; m is m 1 The number of stator phases; p is the pole pair number; s is slip; u (U) 1 Is the stator terminal voltage; f (f) 1 Is electromagnetic frequency; r is R 1 The stator resistor is an equivalent circuit of the motor gamma; x is X 1σ The stator inductance is an equivalent circuit of the motor gamma;R' 2 the equivalent resistance of the rotor of the motor gamma-shaped equivalent circuit is shown; x is X 2σ Rotor inductance of the motor gamma-shaped equivalent circuit; sigma (sigma) 1 The system is corrected for the motor gamma-shaped equivalent circuit.
From equations (3) and (4), the electromagnetic power and torque of the motor are related only to the motor stator terminal voltage U1 for the motor that has been selected by the engineering, and the stator winding terminal voltage per phase in the Γ -shaped equivalent circuit for U1.
B. Conventional wiring form of squirrel-cage motor stator winding
Typically, motor stator windings have "star-connection" as shown in fig. 3 (a) -3 (b) and "delta-connection" as shown in fig. 4 (a) -4 (b). For various motor low-voltage equipment in the traditional AC380V power distribution system, the wiring form of a motor stator is simply adjusted, and the delta connection shown in figures 3 (a) -3 (b) is adjusted to the star connection shown in figures 4 (a) -4 (b), so that the AC660V power distribution voltage level can be adopted.
C. Influence on power supply and distribution system
When the terminals of each winding of the motor are "delta-wired" into the AC220/380V system, the motor stator terminal voltage is AC380V. If the winding wiring of the motor is adjusted to be star-shaped wiring, and the AC380/660V system is connected, the terminal voltage of each stator winding of the motor is also AC380V. As shown in formulas (3) and (4), no matter what power distribution system is adopted, as long as the voltage U1 at the stator end of the motor is kept unchanged, the electromagnetic power and torque of the motor are not changed, and loads such as a fan, a water pump and the like driven by the motor can work according to rated requirements, so that the track engineering requirements are met, and related professions do not need to make any adjustment, so that the engineering applicability of the scheme of the invention is ensured.
From the power grid input of distribution, the rated power of the selected motor is fixed, the low-voltage side AC0.69kV distribution bus is utilized to distribute power to motor loads in rail transit, the power distribution voltage is increased from AC380V to AC660V, the power distribution voltage is increased by 1.73 times, the current flowing through a power distribution cable is only 0.58 times of the current flowing through a corresponding cable of an original AC380V power distribution system, and the voltage drop of a cable line with the same section is 0.33 times of the voltage drop of the original power distribution system.
According toWherein Deltau is the percentage of the voltage drop in units of; l is the length of the line; u (U) n The unit is kV for the nominal voltage of the system; r 'and X' are the resistance and reactance of the three-phase cable in unit length, and the unit is omega/km; tan phi is the power factor tangent value, analysis shows that in engineering projects, the motor equipment capacity P and the line length l are set values, and in order to realize the control of the distribution line terminal voltage drop percentage delta U within the range specified by the national standard, the system nominal voltage U is increased n On the premise that the resistance R 'and the reactance X' of the cable can be allowed to rise, the unit resistance and the reactance of the cable are basically inversely proportional to the cross-sectional area of the cable, i.e. the larger the cross-sectional area of the cable is, the smaller the unit resistance and the reactance of the cable are. That is to say: in order to keep the motor equipment to normally operate, in order to realize that the voltage drop percentage of the tail end of the distribution cable is a certain value, under the condition of improving the nominal voltage of the distribution system, the sectional area of the distribution cable can be reduced, copper materials consumed by the distribution cable and the like are reduced, and the investment of cable engineering is reduced. Assuming that the voltage drop requirement of the cable under the voltage of the AC660V is the same as that of the cable under the voltage of the AC380V, the cable cross-sectional area of the AC660V power distribution system is only 33.3% of that of the cable of the AC380V power distribution system, the cable cross-sectional area is reduced, the consumed copper is reduced, and the direct investment of the cable is reduced by 40% -55%.
In summary, transformers, switching devices, control devices, and cables required for an AC660V power distribution system are mature market products that can be used in the system scheme of the present invention. For various motor low-voltage equipment in the traditional AC380V power distribution system, the AC660V power distribution voltage level can be adopted only by simply adjusting the wiring form of a motor stator and adjusting the wiring form from 'delta connection' to 'star connection'. After the distribution voltage level is improved, the sectional area of a distribution cable of the motor load is reduced, the electric energy loss of a line and the difficulty of cable laying are reduced, and then the engineering investment is reduced.
The remote power distribution system for the rail transit motor load provided by the embodiment of the invention has the following beneficial effects:
1. according to the invention, two three-winding AC35 (10) kV/0.4kV/0.69kV distribution transformers are adopted in a rail transit substation to distribute power to low-voltage loads, wherein a low-voltage side AC0.69kV bus distributes power to the loads of stations and interval motors, and the voltage of a distribution system is AC380V/660V; the low-voltage side AC0.4kV bus distributes power to other loads such as stations, section illumination, weak current systems and the like, and the voltage of the power distribution system is AC220V/380V. According to the invention, by adjusting the scheme of the rail transit power distribution system, different low-voltage power distribution buses of AC0.4kV and AC0.69kV are respectively arranged, AC660/380V power supply is adopted for motor loads, the power supply voltage level of the motor loads is improved, and meanwhile, AC220V/380V power supply is also adopted for illumination and weak current loads. The motor load distribution voltage is improved from the traditional AC380V power supply to the AC660V power supply, the distribution voltage is equivalent to 1.73 times, after the distribution voltage level is improved, the sectional area of a distribution cable of the motor load is reduced, the line electric energy loss and the cable laying difficulty are reduced, and then the engineering investment is reduced. The problems of long distribution distance, large cable investment, large cable laying difficulty and the like faced by the track traffic equipment load with linear distribution characteristics and engineering difficulties are solved.
2. The invention solves the problem that the power and the illumination load share the same bus for a long time, strictly separates the equipment system with high requirements on the electric energy quality, such as illumination, weak current intellectualization and the like, from the impact load power distribution, such as a motor, greatly improves the power supply quality of the illumination and weak current intellectualization equipment, and is beneficial to prolonging the service life of the illumination and weak current equipment. Meanwhile, the bus voltage requirement of the motor load can be properly reduced when the motor is started, the bus voltage can reach 80% of the system nominal voltage when the motor is started, the lighting and power share the bus under the traditional AC380/220V power distribution scheme, the bus voltage requirement is not lower than 85% when the motor is started, and the investment saving of the whole power distribution system is also beneficial.
3. The wiring mode of the stator winding of the motor low-voltage equipment in the rail traffic engineering is adjusted from the triangular wiring mode under the traditional AC380V power supply to the star wiring mode under the AC660V power supply, and only the wiring mode of the motor wiring terminal is changed, so that the motor equipment is hardly affected. However, for the power distribution system, the AC380V power supply is adjusted to the AC660V power supply, so that the cable section is reduced, the cable loss is reduced, the construction difficulty and the investment are reduced, and the copper consumption of the cable is also reduced. The system has higher economic benefit and social benefit in places with large typical remote power distribution requirements such as rail transit.
4. The invention has the advantages that all kinds of equipment and materials required by the invention can be well matched with the existing power supply scheme of the medium-voltage side of the power supply and the existing power distribution requirement of the motor equipment side of the traditional track traffic engineering, the adjustment of related professional equipment of the medium-voltage side and the tail end equipment side of the power supply can not be caused, the implementation has no restriction factors, and the invention has good engineering adaptability and application popularization prospect. Through measurement and calculation, the scheme has very obvious economic value in the places such as the rail traffic engineering, in particular 8 marshalling lines, mountain tunnels, long wiring stations, long sections and the like.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art can easily think about variations or alternatives within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A rail transit motor load remote power distribution system, comprising:
the three-winding type power distribution device comprises a medium-voltage power supply, a medium-voltage distribution device, a medium-voltage/low-voltage three-winding distribution transformer, a 0.4kV distribution device and a 0.69kV distribution device, wherein the medium-voltage power supply is connected with the medium-voltage distribution device, the medium-voltage distribution device is connected with a medium-voltage input winding of the medium-voltage/low-voltage three-winding distribution transformer, and two low-voltage independent output windings of the medium-voltage/low-voltage three-winding distribution transformer are respectively connected with the 0.4kV distribution device and the 0.69kV distribution device;
the 0.4kV power distribution device is used for distributing power for illumination and weak current loads, and the 0.69kV power distribution device is used for distributing power for motor loads.
2.A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the voltage value of the medium-voltage power supply is 10kV, the medium-voltage distribution device adopts a 10kV medium-voltage distribution device, and the medium-voltage/low-voltage three-winding distribution transformer adopts a 10kV/0.4kV/0.69kV three-winding distribution transformer; or, the voltage value of the medium-voltage power supply is 35kV, the medium-voltage distribution device adopts a 35kV medium-voltage distribution device, and the medium-voltage/low-voltage three-winding distribution transformer adopts a 35kV/0.4kV/0.69kV three-winding distribution transformer.
3. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the main wiring form of a medium-voltage bus of the medium-voltage distribution device is a single bus sectional strip connection form, and a spare power automatic switching device is arranged; the main wiring form of the 0.4kV bus of the 0.4kV power distribution device is a single bus sectional area connection form and is provided with a standby power automatic switching device, and the main wiring form of the 0.69kV bus of the 0.69kV power distribution device is a single bus sectional area connection form and is provided with a standby power automatic switching device.
4. A rail transit motor load remote power distribution system as recited in claim 3, wherein,
the 0.69kV bus of the 0.69kV power distribution device comprises a 0.69kV primary-secondary load bus and a 0.69kV tertiary load bus; the 0.4kV bus of the 0.4kV power distribution device comprises a 0.4kV primary-secondary load bus and a 0.4kV tertiary load bus.
5. A rail transit motor load remote power distribution system as recited in claim 3, wherein,
the number of the medium-voltage/low-voltage three-winding distribution transformers is at least two, and the normal operation modes of the sectional bus of the medium-voltage bus, the sectional bus of the 0.4kV bus and the sectional bus of the 0.69kV bus are all in split operation.
6. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the 0.4kV power distribution device is used for distributing power for lighting and weak current loads, and the voltage of a power distribution system is AC220V/380V; the 0.69kV power distribution device is used for distributing power to motor loads, and the voltage of a power distribution system is 380V/660V.
7. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the medium-voltage input winding of the medium-voltage/low-voltage three-winding distribution transformer adopts triangle wiring, and the two low-voltage independent output windings adopt star wiring.
8. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the motor stator winding is connected in star mode.
9. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the motor load comprises a fan, a water pump, an air conditioning unit and a water chilling unit.
10. A rail transit motor load remote power distribution system as recited in claim 1, wherein,
the medium voltage distribution device, the medium voltage/low voltage three-winding distribution transformer, the 0.4kV distribution device and the 0.69kV distribution device are all located in the power substation area.
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