CN116633024A - Quick switching system of distribution system - Google Patents
Quick switching system of distribution system Download PDFInfo
- Publication number
- CN116633024A CN116633024A CN202310829568.3A CN202310829568A CN116633024A CN 116633024 A CN116633024 A CN 116633024A CN 202310829568 A CN202310829568 A CN 202310829568A CN 116633024 A CN116633024 A CN 116633024A
- Authority
- CN
- China
- Prior art keywords
- switching
- power
- power supply
- distribution system
- rapid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 116
- 238000005259 measurement Methods 0.000 claims abstract description 48
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 14
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012795 verification Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 15
- 230000008859 change Effects 0.000 description 14
- 230000008569 process Effects 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H02J13/00036—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 switches, relays or circuit breakers
-
- 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
- H02J13/00001—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 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
-
- 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
- H02J13/00002—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 characterised by monitoring
-
- 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
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A rapid switching system of a power distribution system belongs to the technical field of power distribution system automation and comprises: the power supply switching device is connected with a measurement and control device in a single channel or double channels, the measurement and control device is connected with network communication equipment, and the network communication equipment is connected with a remote monitoring operation terminal; according to the invention, the switching mode of the power supply of the transformer substation can be monitored and confirmed in real time through the operation interface of the upper computer monitoring terminal, a one-key starting switching function is selected, the rapid automatic switching between two power supplies of the transformer substation or between the power supply and the bus sectionalized breaker is realized, the problems that the traditional manual switching operation is influenced by the operation mode of a power distribution system, the operation time is long, the operation steps are multiple, misoperation can occur, and even the power loss caused by the over-current protection misoperation tripping of a power distribution switch of the upper stage due to the influence of an excessive circulation when the power distribution switch of the upper stage is closed in parallel are solved, and meanwhile, the integrity verification of a power supply switching loop is realized.
Description
Technical Field
The invention belongs to the technical field of power distribution system automation, and particularly relates to a rapid switching system of a power distribution system.
Background
At present, when the switching of the two-way power supply incoming line is implemented, the factory power distribution system still adopts the traditional conventional manual operation mode of operators on duty, the operators on duty operate and confirm according to the step sequence by using the content of an electric operation ticket, and the operation process is long in time, multiple in steps and even easy to cause misoperation. In addition, in some special power distribution systems, the two-way power supply inlet wires can come from different power supply and distribution power supply systems, and excessive circulation is generated when the two-way power supplies are closed in parallel and the ring closing time is long when the manual switching operation is switched, so that overcurrent protection action of the upper-stage power supply inlet wires is caused, and the power supply of the power distribution system is subjected to power protection tripping to lose electricity when the switching operation is carried out, so that the power supply reliability and the production power supply continuity of the power distribution system of a factory are affected.
In the special factory power distribution system which does not allow manual parallel loop operation in some two-way power supply inlet wires, for example, in the case of switching operation of a power distribution power supply system with a phase angle difference of 30 degrees in two-way power supply system, the operation is complex, the operation time is long, the operation steps are many and the production is influenced according to the traditional switching operation mode: the power supply of the original power failure load equipment is gradually restored by the production coordination after the power load of the power to be switched is transferred one by the production coordination, the power receiving power switch of the power supply is stopped, then the contact switch of the other power supply is switched on, and the power is transmitted normally.
At present, in some distribution systems configured with automatic switching devices of standby power supplies (namely BZT devices), a manual switching circuit of the power supplies is inconsistent with a switching control circuit of a breaker of the automatic switching circuit of the BZT devices under accidents, the automatic switching device does not have the function of manually and mutually and rapidly switching operation between a working power supply and the standby power supplies in normal operation, the integrity of the automatic switching circuit of the BZT devices cannot be verified, and the integrity of the automatic switching circuit can be verified only when the distribution system fails or periodically scheduled power failure maintenance tests occur. Based on the above situation, even if the BZT device is configured in the power distribution system, the risk is still caused by the abnormal automatic switching-in loop of the standby power supply, and the reliability of the power distribution system is affected.
Disclosure of Invention
In order to solve the problems, the invention provides a rapid switching system of a power distribution system by integrating the power distribution system and switching operation, so as to solve the technical problems that the power distribution system and switching operation needs to be manually confirmed for each operation link in the prior art, and the problems that the manual switching operation mode is complex, the operation time is long, the operation steps are multiple, and the integrity of an automatic switching loop of a standby power supply cannot be verified in operation, thereby ensuring the safe and continuous operation of the power distribution system.
The invention aims at the problems existing above in a factory power supply and distribution system, researches and provides an automatic device configuration system and an implementation method for quick switching operation switching of a factory power supply and distribution system, which thoroughly solve the problems, adapt to the operation requirements of unmanned on site and remote centralized control of the power distribution system, automatically realize quick and reliable mutual switching of incoming lines of power supply and distribution system power supply of the factory within 200-300 milliseconds only by starting a key after operation confirmation of a remote monitoring operation terminal by means of a special power supply switching device, thoroughly avoid the possibility of over-current protection misoperation of a previous stage of power supply and power supply during manual switching operation possibly caused by the change of the operation mode of the power distribution system, and test the integrity of mutual automatic switching loops of the power supply and power supply in the on-line operation at any time or at regular intervals so as to ensure the reliability and the integrity of the switching loops of the power supply and the power supply of the power distribution system, thereby remarkably improve the power supply reliability of the factory power distribution system and the automation level of the power distribution system.
A rapid switching system for a power distribution system adapted for a single bus segment electrical main wiring pattern, comprising:
the power supply switching device is connected with a measurement and control device through a single channel or a double channel, the measurement and control device is connected with network communication equipment, and the network communication equipment is connected with a remote monitoring operation terminal;
the power supply switching device is connected with a measurement and control loop of a first switch in a hard-wired mode, and the first switch is connected with a first power receiving power supply loop and a first power distribution system; the measurement and control loop is connected with a second switch, and the second switch is connected with a second power receiving power supply loop and a second power distribution system; and the measurement and control loop is connected with a third switch, and the third switch is a bus sectionalizer of the first power distribution system and the second power distribution system.
Further, the first power receiving power supply circuit includes:
a first power receiving source;
the first power supply incoming line is hard-wired to be connected with a first power receiving incoming line voltage transformer, and the secondary line voltage of the first power receiving incoming line voltage transformer is hard-wired to be connected with the power supply switching device;
the first power receiving incoming line current transformer is connected in series, and the secondary current of the first power receiving incoming line current transformer is connected to the protection measurement and control device of the first power supply incoming line and the power supply switching device.
Further, the second power receiving power supply circuit includes:
a second power receiving source;
the second power supply incoming line is hard-wired to a second power receiving incoming line voltage transformer, and the secondary line voltage of the second power receiving incoming line voltage transformer is hard-wired to the power supply switching device;
and the second power receiving incoming line current transformer is connected in series, and the secondary current of the second power receiving incoming line current transformer is connected to the protection measurement and control device of the second power supply incoming line and the power supply switching device.
Further, the first power distribution system comprises a first group of bus voltage transformers, wherein the buses are connected with circuit breaker loops of the distributing load equipment, and the distributing load breaker is provided with an electric protection measurement and control device corresponding to the distributing load equipment.
Further, the second power distribution system comprises a second group of bus voltage transformers, wherein the buses are connected with circuit breaker loops of the distributing load equipment, and the distributing load breaker is provided with an electric protection measurement and control device corresponding to the distributing load equipment.
Further, the third switch, namely the bus sectionalizing switch loop, is provided with a bus loop current transformer and a bus protection measurement and control device.
Further, the circuit breaker circuit of the distribution load device is provided with a compensation capacitor or a circuit breaker of the synchronous machine circuit.
Further, the switching system automatically interlocks the loop trip according to the corresponding logic of the accident switch.
Further, the first switch and the second switch are power supply incoming line circuit breakers; the third switch is a bus segment breaker, and the closing time of the power supply incoming line breaker and the segment breaker is less than 60 milliseconds.
Further, the first power receiving incoming line, the second power receiving incoming line and the bus sectionalized loop current transformer comprise secondary side three-phase or two-phase current, and the secondary side three-phase or two-phase current is connected into a current loop of the power switching device through hard wiring.
Furthermore, the measurement and control device is a microcomputer type measurement and control device or a DCS (distributed control system) distributed control device, and all protection measurement and control devices can be connected into the measurement and control device in a communication or hard-wired signal mode.
Further, the switching method of the power supply switching device comprises manual parallel switching, manual serial switching and accident automatic switching.
Further, the loop closing time setting range of the parallel switching is 200 ms to 300 ms.
Further, the phase angle difference between the bus voltage and the backup power supply in the series switching is set in a range of 40 degrees to 45 degrees.
Further, in the series switching mode of the power supply switching device, the phase angle difference between the residual voltage of the working bus and the standby power supply when the breaker of the standby power supply is switched on is smaller than 60 degrees.
The power distribution system rapid switching operation system has the advantages that the habit and steps of traditional power switching operation are changed through the power distribution system rapid switching operation system configured by the invention, and the power distribution system rapid switching operation system has the characteristics of simplicity, reliability, safety, rapidness and the like in switching operation, is particularly suitable for unattended remote monitoring, and is not limited by load flow change and operation modes of the power distribution system. The workload and complexity of switching operation of operators are reduced, the opportunity of misoperation is avoided, the running safety of the power distribution system and the continuous safe and reliable power supply performance for production are ensured, and the disturbance influence on the power supply system during accident switching is reduced.
Terminal equipment accessible host computer operation interface, real-time supervision and affirms the transformer substation power supply switching mode, select the one key to start the switching function, automatic realization transformer substation two-way power supply or receive between power supply and the bus segmentation circuit breaker fast automatic switching switch, long operation time when avoiding traditional power switching operation in the past, operating procedure is many, the chance of misoperation can take place, receive distribution system running mode and load trend change influence to possibly cause distribution system overcurrent protection maloperation problem, do not influence distribution system's normal production operation, and power switching switch operation is simple quick, difficult maloperation problem in the switching operation process of power supply switching.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a fast switching system of a power distribution system according to an embodiment of the present invention;
FIG. 2 illustrates a flow chart of a fast switching operation of a power distribution system in an embodiment of the present invention;
FIG. 3 shows a graph of residual voltage versus backup power source coordinate analysis when a working bus loses power in an embodiment of the invention;
FIG. 4 shows a motor residual voltage characteristic when the working bus is de-energized in an embodiment of the invention;
FIG. 5 shows a graph of the change in line current and bus voltage of a power supply when the working power supply and the backup power supply are manually connected in series and rapidly switched in an embodiment of the invention;
FIG. 6 is a diagram showing the current-voltage variation of parallel loop closing of two power supplies during the conventional manual switching operation in the embodiment of the present invention;
reference numerals: 1-power supply switching device, 2-measurement and control device, 3-network communication equipment, 4-terminal equipment, 5-first power supply inlet circuit, 6-second power supply inlet circuit, 7-protection measurement and control device, 8-synchronous machine or capacitance compensation circuit breaker, 9-10-11-outgoing load circuit breaker loop, 12-first switch (one power receiving switch), 13-second switch (two power receiving switches) and 14-third switch (bus segment switch).
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A rapid switching system for a power distribution system adapted for a single bus segment electrical main wiring pattern, comprising: the power supply switching device 1 is connected with the measurement and control device 2 in a single channel or double channels, the measurement and control device 2 is connected with the network communication equipment 3, and the network communication equipment 3 is connected with the remote monitoring operation terminal 4.
The power supply switching device 1 is connected with a measurement and control loop of a first switch in a hard-wired mode, and the first switch is connected with a first power receiving power supply loop and a first power distribution system; the measurement and control loop is connected with a second switch, and the second switch is connected with a second power receiving power supply loop and a second power distribution system; and the measurement and control loop is connected with a third switch, and the third switch is a bus sectionalizer of the first power distribution system and the second power distribution system.
The first power receiving power supply circuit includes: a first power receiving source; the first power supply incoming line 5 is hard-wired to connect with a first power receiving incoming line voltage transformer, and the secondary line voltage of the first power receiving incoming line voltage transformer is hard-wired to access the power supply switching device 1; the first power receiving incoming line current transformer is connected in series, and the secondary current of the first power receiving incoming line current transformer is connected into the protection measurement and control device 7 and the power switching device 1 of the first power supply incoming line.
The second power receiving power supply circuit includes: a second power receiving source; the second power supply incoming line 6 is connected with a second power receiving incoming line voltage transformer in a hard-wired manner, and the secondary line voltage of the second power receiving incoming line voltage transformer is connected into the power supply switching device 1 in a hard-wired manner; the second power receiving incoming line current transformer is connected in series, and the secondary current of the second power receiving incoming line current transformer is connected to the protection measurement and control device 7 and the power switching device 1 of the second power supply incoming line.
The first power distribution system comprises a first group of bus voltage transformers, wherein the buses are connected with distribution load equipment breaker loops 8 and 9, and the distribution load breaker is provided with an electric protection and measurement and control device corresponding to the distribution load equipment. And the synchronous machine or the capacitance compensation loop breaker 8 is provided with a protection measurement and control device 7 of the corresponding synchronous machine or capacitance compensation loop breaker. The second power distribution system comprises a second group of bus voltage transformers, wherein the buses are connected with distribution load equipment breaker loops 10 and 11, and the distribution load breakers are provided with protection measurement and control devices 7 corresponding to the distribution load equipment. The third switch 14 is a bus sectionalizer of a first group of buses and a second group of buses of the power distribution system, and is provided with a bus-tie loop current transformer and a bus-tie protection measurement and control device 7.
The first switch 12 and the second switch 13 are power inlet circuit breakers, the third switch 14 is a bus sectionalizer, and the closing time of the power inlet circuit breakers and the sectionalizer is less than 60 milliseconds. The three-phase or two-phase current end of the secondary side of the first power receiving incoming line current transformer is connected into a current loop of the power switching device 1 through hard wiring. The measurement and control device 2 is a microcomputer measurement and control device or a DCS distributed control device, and all protection measurement and control devices 7 can be connected into the measurement and control device 2 in a communication or hard-wired mode.
The switching method of the power supply switching device 1 includes manual parallel switching, manual serial switching and accident automatic switching. The loop closing time for the parallel switching is set to be in the range of 200 ms to 300 ms. The phase angle difference between the bus voltage and the standby power supply in the series switching is set to be 40-45 degrees, so that the phase angle difference between the residual voltage of the working bus and the standby power supply is smaller than 60 degrees when the breaker of the standby power supply is switched on in the series switching mode of the power supply switching device 1.
The operation and use method of the rapid switching system of the power distribution system is shown in fig. 2, and is a flow chart of the use method. And the centralized control operator receives an operation scheduling instruction of switching the power supply, and clicks a function key to enter the power supply rapid switching operation interface after confirming the operation mode of the power supply system and the switching mode at the interface of the monitoring operation terminal. Checking whether the switching device in the switching monitoring interface has switching locking and alarm signals, if so, confirming the reason of searching for the alarm and removing the alarm fault, and resetting the alarm signal after clicking a reset signal instruction button. If the manual switching mode does not need to be changed particularly, the switching monitoring interface adopts manual parallel switching by default.
If manual serial switching is needed to be selected due to a special mode of the power distribution system, a switching mode button is clicked in a switching monitoring interface, and after confirmation, the switching monitoring interface is fed back to be a serial switching mode signal. Otherwise, defaulting to a parallel switching mode; the switching command button is confirmed to be clicked in the switching monitoring interface, after confirmation, the system is enabled to automatically and rapidly switch according to the switching logic of 'break before make', and when switching is successful, feedback is carried out on the switching monitoring interface as switching success and locking signals; if the switching fails, an alarm signal is fed back, the switching is stopped, and the power supply of the original power supply loop is automatically recovered. Resetting the switching locking signal on the switching monitoring interface, exiting the power switching interface, confirming the switched signal, and reporting the scheduling.
If the power distribution system has parallel switching conditions, selecting a parallel switching mode, pressing a mode of 'closing before opening', automatically completing switching between two paths of power supplies once only in 200-300 milliseconds when the two power supplies are closed, sending signals of switching completion and switching locking on a switching monitoring interface and a power supply switching device panel, correspondingly changing the power supply mode of the power distribution system, and pressing a 'signal reset' button on the monitoring interface or the power supply switching device panel to confirm and reset the signals so that the switching device has preparation for the next switching operation; if the parallel condition of the system is not satisfied or the equipment or the loop of the power inlet switch and the sectionalizing switch fails to complete switching, switching abnormality and corresponding alarm information prompt are sent out on the switching monitoring interface and the panel of the power switching device, and meanwhile, switching is stopped, the original power supply of the power supply loop is automatically restored, and the original power supply mode of the power distribution system is kept without influencing the normal operation of the power distribution system.
The main items of the alarm information prompt are as follows: switching lockout, fast switching device abnormality, backup power failure abnormality, switch position state abnormality, device PT disconnection, and the like. Compared with the traditional conventional manual operation mode of the attendant, the method has the advantages that the defects that the attendant operates and confirms according to the electric operation ticket content in step sequence, the operation process is long, the operation time is over 10 minutes or even longer, and misoperation is likely to occur are overcome.
If two paths of power supply incoming lines of the power distribution system come from different power supply and distribution power supply systems, and the two paths of power supply systems do not have manual parallel loop closing switching operation conditions, for example, the special condition that the two paths of power supply systems have an inherent phase angle difference of 30 degrees is not allowed to operate in parallel, at the moment, related function buttons are clicked on a switching monitoring interface to confirm to be changed into a serial switching mode, a one-key starting switching function is selected, and the rapid automatic switching between two paths of power supply of a transformer substation or between a power supply and a bus segment breaker is automatically realized according to the mode of 'break before make', wherein the bus loss time is only between 50 milliseconds and 100 milliseconds during the rapid automatic switching, and the loss time is influenced by factors of the switching-on time of the breaker and the logic action time of a power supply switching device.
This has little impact on the production power supply load and the power supply system for a factory power distribution system having a large capacity of inductive load or capacitive compensation load. The disturbance can subside within 100 milliseconds with little impact on the continuous operation of the production system. Compared with the traditional manual operation mode, the method has the advantages that the defects that production is influenced in the traditional manual operation mode, the switching operation time is long and the operation steps are multiple in the traditional manual operation mode are avoided, after the power supply load of the power to be cut is transferred through production cooperation, the power receiving power switch of the power receiving circuit is stopped, then the switching operation of the contact switch of another power source is performed, and after power transmission is normal, the complex switching operation of the original power cut equipment is gradually restored through production technology cooperation.
For a factory distribution system with high power supply reliability requirement, the automatic switching device of the standby power supply is not configured according to the traditional conventional method in the two paths of power supply incoming lines or bus segments, the power supply rapid switching system is replaced by the configuration of the power supply rapid switching system, the rapid automatic switching function of the power supply is configured in the power supply switching device, the corresponding functions of 'protection starting', 'reverse power starting', 'no-current starting or abnormal frequency starting', 'no-voltage starting', 'false jump starting', and the like are input, and the rapid switching or 'synchronous capturing switching', 'residual voltage detection switching' mode is realized according to the mode of 'series switching', so that the rapid automatic switching function between the two power supplies under the power supply system power failure accident is realized, and the obvious advantages of short power supply failure time, small system disturbance, short influence time and small influence on production continuous power supply are ensured. When the residual voltage detection switching logic is implemented, the matched circuit breaker with the compensation capacitor or the synchronous machine is automatically cut off in an interlocking mode.
The normal manual switching operation loop of the power supply switching device is completely consistent with the closing loop of the automatic and rapid power supply switching outlet under the accident condition, so that the periodic mutual switching test of the two paths of power supplies of the power distribution system under the normal operation condition can be realized, the integrity of the mutual power supply switching loop is verified, and the problems that the conventional BZT device does not have the manual mutual operation switching function during the normal operation, the integrity of the automatic switching loop of the standby power supply of the BZT device cannot be checked and tested during the normal operation, and the reliability of the power supply and distribution system is affected are avoided.
The bus power supply of the working section is suddenly disconnected and is influenced by the feedback of the load of the motor on the bus after losing power, the change process of the bus residual voltage relative to the standby power supply is analyzed by polar coordinates, as shown in a motor residual voltage characteristic curve in figure 3, the bus residual voltage is continuously attenuated, and the phase angle between the bus residual voltage and the standby power supply is continuously changed from 0 degree to 360 degrees. As shown in fig. 4, in an embodiment, the power supply with inductive motor loads is supplied by the phase angle difference change characteristic curve between the residual voltage of the bus and the voltage of the standby power supply after the working power supply loses power, and the analysis chart has the characteristics of the residual voltage and the phase angle difference change of the bus of the power supply buses with a plurality of motor loads after the working power supply loses power and the closing of a safety area allowed by the motor.
The motor can bear 1.1 to 1.2 times rated voltage for a long time, and the motor is safe as long as the voltage applied to the motor when the standby power supply is selected to be closed does not exceed the withstand voltage value of the motor. Therefore, the standby power can pull the motor group into synchronization under the condition of small impact when the standby power is input. In the occasion that the number and the capacity of the motor group are large, the change speed of the phase angle phi between the residual voltage of the working bus and the voltage of the standby power supply is slow, and the switching-on and switching-off time of the special power supply switching device and the circuit breaker is short, and the switching-on time is less than 60 milliseconds. In the prior art, when the phi angle of the standby power supply is about 60 degrees or less, and the standby power supply in se:Sub>A safety arese:Sub>A of the right side of the A' -B-C-A curve is quickly switched on, the bus power-off time is less than 100 milliseconds, and the influence on se:Sub>A power supply and distribution system is small. In this case, the continuous power supply operation of the low-voltage contactor control device is not interrupted, nor is the frequency converter control device tripped.
For a power supply and distribution system with a phase angle difference of 30 degrees between two power supplies of the power supply and distribution system, if the situation of high inductive or capacitive load capacity exists, a power switch of the power supply and distribution system generally adopts a spring energy storage vacuum breaker, an SF6 insulation breaker and other breakers for quick switching on/off, when serial switching is adopted and switching is completed within 100 milliseconds, the phase angle difference of residual voltage of a working bus changes by only 5 to 10 degrees, when the phase angle phi between the residual voltage of the bus and the phase angle of the standby power supply is completely met when the standby power supply is switched on, the phase angle phi is less than 60 degrees, and the motor is safely allowed.
The rapid switching operation system of the invention adopts series switching to realize power supply systems with different sources, and under extreme conditions, two power supply systems have fixed phase angle difference of 30 degrees, thus being completely feasible, and the power supply continuity and the safety performance can meet the requirements. Compared with the prior art that the production cooperation is adopted, the working bus power supply can be powered off after all the load equipment on the working bus section is powered off, the working bus power supply is switched to the standby power supply and is normal, the complex operation of the original power-off load equipment on the working bus is recovered one by one according to the production process arrangement, and the power-off operation steps and the power-off operation switching have obvious superiority and application innovation to the influence degree of production restriction.
The analysis of the change wave record of the incoming power line current when the two power supplies are rapidly switched in series is shown in fig. 5, which is a change chart of the incoming power line current and the bus voltage manually switched in series when the rapid power supply switching system is adopted in an embodiment, and is suitable for the analysis of the current and the voltage when the rapid manual serial switching is performed between the working power supply and the standby power supply.
When the automatic rapid switching is implemented by serial switching, the residual voltage of the working bus gradually decays and the pressure difference between the working bus and the standby power is gradually increased when the working power is automatically disconnected and the bus loses power, the maximum peak value of the pressure difference is only about 24V when the standby power is switched on, the phase angle difference is only about 5-6 degrees, the power losing time of the working bus is only about 64 milliseconds, after the switching, the current fluctuation is restored to normal load current after the waveform of 5 cycles (the waveform time of 5 cycles is 100 milliseconds), and the power supply system disturbance is very small, and all high-voltage equipment, high-voltage variable-frequency power supply equipment, low-voltage variable-frequency power supply equipment and low-voltage equipment powered by a contactor do not trip.
The power supply serial connection rapid automatic switching operation is adopted, the switching mode is completed within 100 milliseconds, the disturbance to the power supply and distribution system is small, and the influence on continuous production power supply is small. The error area requiring power failure in the switching in the traditional technology is broken. The step of 'uninterrupted' quick switching operation among different power supply systems, especially the power switching operation of the power supply and distribution system with a fixed phase angle difference of 30 DEG between two power supply systems under the condition of opposite poles, can realize the 'one-key switching' function of the power supply system at the operation terminal of the monitoring system. For the power switching operation of the power supply and distribution system without the fixed phase angle difference of 30 degrees, the parallel switching mode is adopted to realize the rapid switching operation between two power supplies by one-key switching in the operation interface of the monitoring terminal, and the parallel switching operation mode has obvious advantages compared with the traditional parallel switching operation mode of the power supplies.
In one embodiment, as shown in fig. 6, a current change chart of the two power supplies during manual parallel ring closing operation is suitable for a current change process of the working power supply and the standby power supply during manual parallel ring closing operation, and can analyze the problems of 'circulation' and current increase generated during switching of the two power supplies in parallel operation in a traditional mode.
In fig. 6, when a certain plant 6kV working segment a and B are supplied with power from a certain standby power supply, the load current of the a segment power supply is 465 and A, B, the load current is 392A, and the power supply bus voltage is 6.18kV. When the working section A is changed into a working power supply with different transformers for supplying power (the problem that a power supply system does not have a fixed 30 DEG phase angle difference), when the traditional manual parallel switching is adopted, the working power supply of the section A is manually closed (the voltage of the working power supply is 6.38 kV), the working power supply of the section A and the standby power supply are in parallel loop-closing operation, at the moment, a 'loop current' exists between the working power supply and the standby power supply due to the voltage difference between the working power supply and the standby power supply, the incoming current of the standby power supply of the section A rises from the original 465A to 544A, and the incoming current of the working power supply of the section A rises from the 0A in the original loop-off state to about 1009A (the original load current of the section A is only 465A); the line current of the working power supply of the section A drops to about 462A (namely the original load of the section A) after the section A standby power supply switch is disconnected. Similar "loop" problems also exist in the parallel loop closing operation of section B. Therefore, the loop current exists when the working power supply of the section A and the standby power supply are in parallel operation and the power supply inlet current of the section A is always higher than the load current of the section A (the voltage difference exists between the two power supplies) during loop closing. If the running mode change of the power distribution system is considered in expansion, the wire inlet current of the A-section working power supply when the power supplies are in parallel loop closing operation may be larger than the wire inlet overcurrent protection fixed value of the A-section power supply, so that overcurrent protection misoperation is caused during the parallel loop closing operation. This is the biggest problem of manual parallel operation of two traditional power supplies, and this problem has caused the accident case that power supply system loses power in the switching operation process of a plurality of power supplies in the power distribution system of a plurality of factories.
The rapid switching system of the power distribution system can realize rapid parallel switching operation between two power supplies by adopting a parallel switching mode in a monitoring terminal operation interface of the power distribution system in a one-key switching function in a monitoring terminal operation interface of the power distribution system according to requirements or when switching is manually started in a periodical test, namely, the rapid and reliable switching of the incoming line of the power supply of the power distribution system of a factory can be automatically realized within 200 milliseconds to 300 milliseconds, and the parallel time of the two power supplies is generally smaller than the overcurrent protection action time of the power supplies, thereby thoroughly avoiding the possibility of the overcurrent protection action of the power supply of the previous stage in the traditional manual switching operation possibly caused by the change of the operation mode of the power distribution system, and checking the integrity of the mutual automatic switching loop of the power supply in the power distribution system at any time or in the periodical online operation, so as to ensure the reliability and the integrity of the switching loop of the power supply of the power distribution system of the power supply distribution system, thereby remarkably improving the automation level of the power distribution system. This has significant advantages over conventional power supply parallel switching modes of operation.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A rapid switching system for a power distribution system adapted for a single bus segment electrical main wiring pattern, comprising:
the power supply switching device is connected with a measurement and control device in a single channel or double channels, the measurement and control device is connected with network communication equipment, and the network communication equipment is connected with a remote monitoring operation terminal;
the power supply switching device is connected with a measurement and control loop of a first switch in a hard-wired mode, and the first switch is connected with a first power receiving power supply loop and a first power distribution system; the measurement and control loop is connected with a second switch, and the second switch is connected with a second power receiving power supply loop and a second power distribution system; and the measurement and control loop is connected with a third switch, and the third switch is a bus sectionalizer of the first power distribution system and the second power distribution system.
2. The electrical distribution system rapid-transit switching system of claim 1, wherein the first powered power supply loop comprises:
a first power receiving source;
the first power supply incoming line hard wire is connected with a first power receiving incoming line voltage transformer, and the secondary line voltage of the first power receiving incoming line voltage transformer is connected into the power supply switching device through the hard wire;
the secondary current of the first power receiving incoming line current transformer is connected into the protection measurement and control device of the first power source incoming line and the power source switching device.
3. The electrical distribution system rapid-transit switching system of claim 1, wherein the second power-receiving power circuit comprises:
a second power receiving source;
the second power supply incoming line is hard-wired to a second power receiving incoming line voltage transformer, and the secondary line voltage of the second power receiving incoming line voltage transformer is hard-wired to the power supply switching device;
the protection measurement and control device is connected with a second power receiving incoming line current transformer in series, and the secondary current of the second power receiving incoming line current transformer is connected with a protection measurement and control device of a second power incoming line and the power switching device.
4. The electrical distribution system rapid-switching system of claim 1, wherein the first electrical distribution system comprises a first set of bus voltage transformers, wherein the bus is connected with a distribution load device circuit breaker circuit configured with an electrical protection measurement and control device corresponding to the distribution load device.
5. The electrical distribution system rapid-switching system of claim 1, wherein the second electrical distribution system comprises a second set of bus voltage transformers, the bus being connected with a distribution load device breaker loop, the distribution load breaker being configured with electrical protection measurement and control devices for the respective distribution load devices.
6. The rapid switching system of claim 1, wherein the third switch, i.e., bus bar sectionalizing switch circuit, is provided with a bus bar loop current transformer and a bus bar protection measurement and control device.
7. The electrical distribution system rapid transit switching system of claim 4 wherein the load-shedding apparatus circuit breaker circuit is provided with a compensating capacitor or a circuit breaker of a synchronous machine circuit.
8. The electrical distribution system rapid transit switching system of claim 1 wherein the switching system automatically interlocks the loop trip in accordance with the corresponding logic of the accident switch.
9. The electrical distribution system rapid-inverting switching system of claim 1 wherein the first and second switches are power inlet circuit breakers; the third switch is a bus segment breaker, and the closing time of the power supply incoming line breaker and the segment breaker is less than 60 milliseconds.
10. The electrical distribution system rapid-change-over switching system of claim 2, wherein the first and second powered wires and the bus segment loop current transformer comprise secondary side three-phase or two-phase currents that are hard-wired into the current loop of the power switching device.
11. The rapid switching system of claim 1, wherein the measurement and control device is a microcomputer measurement and control device or a DCS decentralized control device, and all protection measurement and control devices can be connected to the measurement and control device in a communication or hard-wired signal manner.
12. The rapid switching system of claim 1, wherein the switching method of the power switching device comprises manual parallel switching, manual series switching and accident automatic switching.
13. The electrical distribution system rapid transit switching system of claim 12 wherein the parallel switch loop closing time is set in the range of 200 milliseconds to 300 milliseconds.
14. The electrical distribution system rapid transit switching system of claim 12 wherein the phase angle difference between the bus voltage and the backup power source in the series switch is set in the range of 40 degrees to 45 degrees.
15. The rapid switching system of claim 14, wherein the phase angle difference between the residual voltage of the working bus and the backup power supply when the circuit breaker of the backup power supply is switched in the series switching mode of the power supply switching device is less than 60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310829568.3A CN116633024A (en) | 2023-07-06 | 2023-07-06 | Quick switching system of distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310829568.3A CN116633024A (en) | 2023-07-06 | 2023-07-06 | Quick switching system of distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116633024A true CN116633024A (en) | 2023-08-22 |
Family
ID=87592330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310829568.3A Pending CN116633024A (en) | 2023-07-06 | 2023-07-06 | Quick switching system of distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116633024A (en) |
-
2023
- 2023-07-06 CN CN202310829568.3A patent/CN116633024A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11355961B2 (en) | Method and system for fast reconfiguration of power supply network in tens of milliseconos after power grid failure | |
| CN109713794B (en) | Distributed intelligent self-recovery system and method | |
| CN108565974B (en) | Self-powered remote failure protection method and system based on protection device | |
| CN107947340B (en) | Power supply fast switching system and switching method thereof | |
| CN110854924A (en) | One-time voltage-on synchronous phase-checking linkage switching inspection system and inspection method for electrical system | |
| CN111668940B (en) | Power station control system and control method | |
| CN112491040A (en) | Automatic switching device for standby power supply line of superconducting cable and operation method thereof | |
| CN102801207A (en) | Backup auto-switching voltage loss start interlocking method for multi-power double-bus substation | |
| CN112332521B (en) | Sectional spare power automatic switching circuit configured by bus main transformer low-voltage double branches and control method thereof | |
| CN202550668U (en) | Distributed power distribution network management terminal | |
| CN201374585Y (en) | Undisturbed stability control device | |
| CN103972865A (en) | Control method for preventing motor from being switched into short-circuit fault | |
| CN114062973B (en) | In-situ feeder automation reverse locking application method | |
| CN116633024A (en) | Quick switching system of distribution system | |
| CN112751316B (en) | Configuration method and device for power failure of bus voltage transformer | |
| CN213754084U (en) | Dual-power supply system adopting power supplies with different grounding modes | |
| CN112182816B (en) | Method for preventing misoperation in online mode in accident voltage loss region of 35 kV-110 kV power grid | |
| CN114977171A (en) | Power distribution network load transfer method and device | |
| CN200976511Y (en) | Auto-switch-on device having pattern recognition function | |
| CN114069610B (en) | Power system dispatching control management method and system | |
| Chen et al. | A full-automatic test system for the intelligent substation based on GOOSE/SV signal simulation | |
| CN111917104B (en) | Circuit for preventing misoperation of bus voltage parallel circuit | |
| CN114069569B (en) | Method for reducing electric quantity loss of distribution box in fault state | |
| CN220087006U (en) | Railway digital main transformer backup power automatic switching system | |
| CN220156284U (en) | Station service power switching system for providing standby power for multiple generator sets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |