CN207442525U - A kind of MCC busbares Dual-power switching system - Google Patents

A kind of MCC busbares Dual-power switching system Download PDF

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Publication number
CN207442525U
CN207442525U CN201720920116.6U CN201720920116U CN207442525U CN 207442525 U CN207442525 U CN 207442525U CN 201720920116 U CN201720920116 U CN 201720920116U CN 207442525 U CN207442525 U CN 207442525U
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power supply
switch
power
mcc
main power
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CN201720920116.6U
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白艳婷
翁良军
李怀杰
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Huainan Tianjiaan Power Station of Anhui Electric Power Co Ltd
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Huainan Tianjiaan Power Station of Anhui Electric Power Co Ltd
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

The utility model provides a kind of MCC busbares Dual-power switching system, helps to improve the stability of electrical equipment, reduces the failure rate of electrical equipment.Said system includes：Double-power supply switching device, the main power switch being electrically connected with the double-power supply switching device and Backup Power Switch；The double-power supply switching device, for according to the three-phase alternating voltage on MCC busbares judge MCC busbares whether decompression, when MCC bus loss of pressure, the action of the main power switch and Backup Power Switch is controlled, the working power of electrical equipment is switched into stand-by power supply from main power source.The utility model is suitable for technical field of electric power.

Description

A kind of MCC busbares Dual-power switching system
Technical field
The utility model is related to technical field of electric power, particularly relate to a kind of MCC busbares Dual-power switching system.
Background technology
At present, an Auxiliary System in Power Plant 380V systems largely use dual power supply handoff technique, wherein, there are more for a unit 380V double-power supply switching devices, but the performance due to the double-power supply switching device and power plant scene main power supply switch (including： Main power switch and Backup Power Switch) and power supply is controlled to have differences, cause motor control center (MCC, Motor Control center) Dual-power switching system design it is unreasonable, in the case of normal power supplies busbar dead electricity, major-minor breaker It can not realize and exchange using function mutually, stand-by power supply be caused not haul oneself willingly into so that dual power supply handoff functionality cannot be played normally Effect, causes electrical equipment dead electricity, causes electrical equipment fluctuation of service, high failure rate.Existing MCC busbares dual power supply switching System is primarily present following shortcoming：
First, referring to shown in Fig. 1, Fig. 2, Fig. 3, the basis for estimation that dual power supply handoff functionality is realized is unreasonable.As spare The backup power source voltage of one of power switchover entry condition is taken from MCC busbar voltages, and MCC busbares lose when main power source trips Electricity, the voltage as automatic closing basis for estimation is not present, thus double-power supply switching device can not start stand-by power supply and open It hauls oneself willingly into pass.MCC busbares and main power supply switch equal no-voltage mutual inductor suitable for reading, and power transfer device is opened respectively from main power supply It shuts mouth and introduces working power and power supply switching dress of three-phase voltage (U1, U2) of the line voltage for 380V as power transfer device The basis for estimation for starting main power supply switching is put, is thus had the following problems：In the case of jump occurs for main power switch, Although decompression, main power source bus bar side switch 1DL also normal voltage, power transfer device suitable for reading can judge by accident MCC busbares Disconnected MCC busbares have pressure without starting, and MCC stand-by power supplies can not be realized and hauled oneself willingly into.
Second, referring to shown in Fig. 1, the control Power Selection of main power supply switch is unreasonable.The control of main power supply switch Power supply is selected from this switch 380V AC powers suitable for reading, and when the switch 3DL trippings of main power source side, three-phase alternating-current supply loses and can cause Control power supply loses, and main power source bus bar side switch 1DL will be unable to trip, and stand-by power supply handoff functionality can not be realized.Referring to Fig. 2 institutes Show, since MCC main power supply switch trips coil, closing coil can only be controlled using AC power, i.e., MCC main power sources are female Line side switch 1DL breaker tripping and closing power supplys are taken from 1DL AC powers suitable for reading, MCC stand-by power supplies bus bar side switch 2DL breaker tripping and closing power supplys 2DL AC powers suitable for reading are taken from, when main power switch voltage U1 suitable for reading loses, although double-power supply switching device can carry out Normal logic judgment simultaneously sends tripping 1DL instructions, but since 1DL loses control power supply, therefore 1DL can not trip, and then lead 2DL is caused to haul oneself willingly into failure without reclosing command.
3rd, referring to shown in Fig. 1, Fig. 3, the double-power supply switching device before transformation has put into self-recovering function, in standby electricity In the case that source is run, start self-recovering function when main power voltage recovers, and the realization of self-recovering function is first to jump Stand-by power supply bus bar side switch 2DL is opened, then just puts into main power source bus bar side switch 1DL, handoff procedure of so connecting can cause There are one short-time loss of power supply processes for MCC busbares.During this of short duration dead electricity, all electrical equipments are by moment on MCC busbares Dead electricity.
Electrical equipment power supply on MCC busbares is typically all what is controlled by A.C. contactor.It exchanges in the case Contactor coil can cause contactor to disconnect when losing power supply in short-term, and then cause the electrical equipment on busbar out of service. Although after having added self-sustaining time-delay relay in the control loop of important electrical equipment to realize short-time loss of power supply Power supply self-recovering function, but also will to lose power supply out of service for part electrical equipment, and operator switches just in power supply Stoppage in transit electrical equipment must be carried out immediately after often to recover power transmission operation one by one.So self-healing series connection switching mode is to electricity consumption The safe operation of equipment brings unnecessary risk.
4th, function and operations staff's operation are hauled oneself willingly into the unreasonable influence of main power supply switch control circuit design.Active and standby electricity The control power supply of source switch can only be AC power, and combined floodgate and the tripping of main power supply switch use on power transfer device Key system is completed, and without any other external control mode, i.e. the active and standby power switches of MCC do not carry out outer control loop and connect Enter, only controlled by the key system on power transfer device, it is cumbersome and can not realize distant place control, it is on duty to running Member makes troubles.
Utility model content
It is existing to solve the technical problem to be solved by the present invention is to provide a kind of MCC busbares Dual-power switching system Electrical equipment present in technology is because of fluctuation of service, the high failure rate caused by dead electricity the problem of.
In order to solve the above technical problems, the utility model embodiment provides a kind of MCC busbares Dual-power switching system, bag It includes：Double-power supply switching device, the main power switch being electrically connected with the double-power supply switching device and Backup Power Switch；
The double-power supply switching device, for judging whether MCC busbares lose according to the three-phase alternating voltage on MCC busbares Pressure, when MCC bus loss of pressure, controls the action of the main power switch and Backup Power Switch, by the work electricity of electrical equipment Source switches to stand-by power supply from main power source.
Optionally, the control cabinet door of the main power switch and Backup Power Switch is equipped with breaker tripping and closing button, tripping shape State indicator light and "on" position indicator light.
Optionally, control power supply and the double-power supply switching device working power of main power switch and Backup Power Switch are Ups power.
Optionally, the control loop of the main power switch and the control loop of Backup Power Switch are respectively connected to unit ECS control centres.
Optionally, the main power switch includes：Main power source bus bar side switchs 1DL；The Backup Power Switch includes：It is standby 2DL is switched with power supply bus bar side；
The control loop of the main power source bus bar side switch 1DL includes：Breaker normally opened contact 1HA and ECS switches form First parallel branch, first parallel branch and the closing coil of main power source bus bar side switch 1DL form the first series arm, Breaker normally opened contact 1TA, double-power supply switching device and ECS switch composition the second parallel branch, second parallel branch with The breaking coil of main power source bus bar side switch 1DL forms the second series arm, first series arm and the second series arm It is in parallel；
The control loop of the stand-by power supply bus bar side switch 2DL includes：Breaker normally opened contact 2HA, dual power supply switching Device and ECS switch the 3rd parallel branches of composition, the 3rd parallel branch and the closing line of stand-by power supply bus bar side switch 2DL Circle the 3rd series arm of composition, breaker normally opened contact 2TA and ECS switch the 4th parallel branches of composition, the described 4th branch in parallel The breaking coil of road and stand-by power supply bus bar side switch 2DL form the 4th series arm, the 3rd series arm and the 4th string Join branch circuit parallel connection.
Optionally, the double-power supply switching device does not include self- recoverage logic circuit.
The above-mentioned technical proposal of the utility model has the beneficial effect that：
In said program, judge that MCC busbares are according to the three-phase alternating voltage on MCC busbares by double-power supply switching device No decompression when MCC bus loss of pressure, controls the action of the main power switch and Backup Power Switch, by the work of electrical equipment Make power supply and switch to stand-by power supply from main power source, in this way, the three-phase alternating voltage directly taken from MCC busbares access power supply is cut Changing device as judge MCC busbares whether the foundation of decompression, power transfer device can correctly judge MCC busbar voltages, in MCC During bus loss of pressure, power transfer device can correctly control the action of main power switch and Backup Power Switch so that electricity consumption is set Standby working power switches to stand-by power supply from main power source, MCC automatic closings is realized, so as to improve electrical equipment Stability reduces the failure rate of electrical equipment and maintenance maintenance expense, sound assurance MCC busbar Dual-power switching systems Operational safety.
Description of the drawings
Fig. 1 is the MCC main power supply primary connection figures that the utility model embodiment provides；
Fig. 2 is that the dual power supply that the utility model embodiment provides switches voltage block access situation schematic diagram；
Fig. 3 is the action logic figure of the double-power supply switching device before the transformation that the utility model embodiment provides；
Fig. 4 is the control drawing that the main power source bus bar side that the utility model embodiment provides switchs 1DL；
Fig. 5 is the control drawing that the stand-by power supply bus bar side that the utility model embodiment provides switchs 2DL；
Fig. 6 is the action logic figure for the improved double-power supply switching device that the utility model embodiment provides.
Specific embodiment
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing And specific embodiment is described in detail.
The utility model because of fluctuation of service, the high failure rate caused by dead electricity the problem of, is carried for existing electrical equipment For a kind of MCC busbares Dual-power switching system.
Referring to shown in Fig. 1, a kind of MCC busbares Dual-power switching system that the utility model embodiment provides, including：Double electricity Source switching device, the main power switch being electrically connected with the double-power supply switching device and Backup Power Switch；
The double-power supply switching device, for judging whether MCC busbares lose according to the three-phase alternating voltage on MCC busbares Pressure, when MCC bus loss of pressure, controls the action of the main power switch and Backup Power Switch, by the work electricity of electrical equipment Source switches to stand-by power supply from main power source.
MCC busbar Dual-power switching systems described in the utility model embodiment, by double-power supply switching device according to MCC Three-phase alternating voltage on busbar judge MCC busbares whether decompression, when MCC bus loss of pressure, control the main power switch and The working power of electrical equipment is switched to stand-by power supply by the action of Backup Power Switch from main power source, in this way, will directly from The three-phase alternating voltage access power transfer device taken on MCC busbares as judge MCC busbares whether the foundation of decompression, power supply cuts Changing device can correctly judge MCC busbar voltages, when MCC bus loss of pressure and stand-by power supply have voltage, power transfer device energy It is enough correctly to control the action of main power switch and Backup Power Switch so that the working power of electrical equipment is switched from main power source To stand-by power supply, MCC automatic closings are realized, so as to the event for improving the stability of electrical equipment, reducing electrical equipment Barrier rate and maintenance maintenance expense, the sound assurance operational safety of MCC busbar Dual-power switching systems.
In the utility model embodiment, when MCC bus loss of pressure and when stand-by power supply has voltage, stand-by power supply is automatically switched to For power supply for electrical equipment, after hauling oneself willingly into switching, when main power voltage recovers, it is power supply for electrical equipment to automatically switch to main power source, from And so that main power source and stand-by power supply exchange mutually use, improved MCC busbares Dual-power switching system meets country and electricity The related safety of Lixing industry and technology requirement.
In the specific embodiment of foregoing MCC busbares Dual-power switching system, optionally, the main power switch and standby Breaker tripping and closing button, tripped condition indicator light and "on" position indicator light are equipped with the control cabinet door of power switch.
In the utility model embodiment, installation main power source is opened in the control cabinet door of main power switch and Backup Power Switch Breaker tripping and closing button, main power switch tripped condition indicator light and main power switch "on" position indicator light are closed, while is installed spare Power switch breaker tripping and closing button, Backup Power Switch tripped condition indicator light and Backup Power Switch "on" position indicator light, just It operates in main power switch breaker tripping and closing button and Backup Power Switch breaker tripping and closing button, while is opened convenient for observation main power source Close tripping, "on" position and Backup Power Switch tripping, "on" position.
In the specific embodiment of foregoing MCC busbares Dual-power switching system, optionally, main power switch and standby electricity The control power supply and double-power supply switching device working power of source switch are ups power.
In the utility model embodiment, using safe and reliable uninterruptible power supply (Uninterruptible Power System, UPS) as the control power supply of main power switch and Backup Power Switch and the working power of power transfer device, from And overcome when main power source side switch 3DL tripping when, can not automatic stand-by power supply the defects of.
In the specific embodiment of foregoing MCC busbares Dual-power switching system, optionally, the control of the main power switch The control loop of circuit processed and Backup Power Switch is respectively connected to the ECS control centres of unit.
In the utility model embodiment, the control loop of the control loop of main power switch and Backup Power Switch is distinguished Electric control system (Electrical Control System, ECS) control centre of unit is caused, so as to main power switch Remote operation and monitoring are carried out with Backup Power Switch.
In the specific embodiment of foregoing MCC busbares Dual-power switching system, optionally, the main power switch bag It includes：Main power source bus bar side switchs 1DL；The Backup Power Switch includes：Stand-by power supply bus bar side switchs 2DL；
The control loop of the main power source bus bar side switch 1DL includes：Breaker normally opened contact 1HA and ECS switches form First parallel branch, first parallel branch and the closing coil of main power source bus bar side switch 1DL form the first series arm, Breaker normally opened contact 1TA, double-power supply switching device and ECS switch composition the second parallel branch, second parallel branch with The breaking coil of main power source bus bar side switch 1DL forms the second series arm, first series arm and the second series arm It is in parallel；
The control loop of the stand-by power supply bus bar side switch 2DL includes：Breaker normally opened contact 2HA, dual power supply switching Device and ECS switch the 3rd parallel branches of composition, the 3rd parallel branch and the closing line of stand-by power supply bus bar side switch 2DL Circle the 3rd series arm of composition, breaker normally opened contact 2TA and ECS switch the 4th parallel branches of composition, the described 4th branch in parallel The breaking coil of road and stand-by power supply bus bar side switch 2DL form the 4th series arm, the 3rd series arm and the 4th string Join branch circuit parallel connection.
In the utility model embodiment, the control loop of the main power source bus bar side switch 1DL, ginseng are shown referring to Fig. 4 See that Fig. 5 show the control loop of the stand-by power supply bus bar side switch 2DL, by the control that main power source bus bar side is switched to 1DL The control loop of circuit processed and stand-by power supply bus bar side switch 2DL cause the electric control system (Electrical of unit respectively Control System, ECS) control centre, to carry out remote operation and monitoring to main power switch and Backup Power Switch.
In the specific embodiment of foregoing MCC busbares Dual-power switching system, optionally, the double-power supply switching device Do not include self- recoverage logic circuit.
In the utility model embodiment, under the default configuration of system, referring to shown in Fig. 6, improved dual power supply switches Device does not include self- recoverage logic circuit, carries out main power source, spare in the distance by running person on duty when main power source recovers normal Power supply cyclization, then disconnects Backup Power Switch again, so as to overcome the startup self-recovering function meeting involved in background technology Cause all electrical equipments on MCC busbares that moment dead electricity, improved double-power supply switching device are improved the fortune of electrical equipment Row stability adds the security of operation.If necessary to self-recovering function, the default configuration that can change system is realized from extensive Multiple function.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill of the art For personnel, on the premise of principle described in the utility model is not departed from, several improvements and modifications can also be made, these improvement The scope of protection of the utility model is also should be regarded as with retouching.

Claims (1)

1. a kind of MCC busbares Dual-power switching system, which is characterized in that including：Double-power supply switching device is cut with the dual power supply The main power switch and Backup Power Switch of changing device electrical connection；
The double-power supply switching device, for according to the three-phase alternating voltage on MCC busbares judge MCC busbares whether decompression, when During MCC bus loss of pressure, the action of the main power switch and Backup Power Switch is controlled, by the working power of electrical equipment from master Switch power supply to stand-by power supply；
The main power switch includes：Main power source bus bar side switchs 1DL；The Backup Power Switch includes：Stand-by power supply busbar Side switchs 2DL；
The control loop of the main power source bus bar side switch 1DL includes：Breaker normally opened contact 1HA and ECS switches composition first Parallel branch, first parallel branch and the closing coil of main power source bus bar side switch 1DL form the first series arm, open circuit Device normally opened contact 1TA, double-power supply switching device and ECS switch the second parallel branches of composition, second parallel branch and main electricity The breaking coil of source bus bar side switch 1DL forms the second series arm, and first series arm and the second series arm are in parallel；
The control loop of the stand-by power supply bus bar side switch 2DL includes：Breaker normally opened contact 2HA, double-power supply switching device And ECS switch the 3rd parallel branches of composition, the 3rd parallel branch and the closing coil group of stand-by power supply bus bar side switch 2DL Into the 3rd series arm, breaker normally opened contact 2TA and ECS switch the 4th parallel branches of composition, the 4th parallel branch with The breaking coil of stand-by power supply bus bar side switch 2DL forms the 4th series arm, the 3rd series arm and the 4th series connection branch Road is in parallel；
Wherein, the control cabinet door of the main power switch and Backup Power Switch is equipped with breaker tripping and closing button, tripped condition indicates Lamp and "on" position indicator light；
Wherein, main power switch and the control power supply and double-power supply switching device working power of Backup Power Switch are ups power；
Wherein, the control loop of the main power switch and the control loop of Backup Power Switch are respectively connected to the ECS of unit Control centre；
Wherein, the double-power supply switching device does not include self- recoverage logic circuit.
CN201720920116.6U 2017-07-27 2017-07-27 A kind of MCC busbares Dual-power switching system Active CN207442525U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720920116.6U CN207442525U (en) 2017-07-27 2017-07-27 A kind of MCC busbares Dual-power switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720920116.6U CN207442525U (en) 2017-07-27 2017-07-27 A kind of MCC busbares Dual-power switching system

Publications (1)

Publication Number Publication Date
CN207442525U true CN207442525U (en) 2018-06-01

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