CN220156284U - Station service power switching system for providing standby power for multiple generator sets - Google Patents

Abstract

The utility model discloses a station service power switching system for providing standby power for a plurality of generator sets, which is used for switching a station service section high-voltage power distribution device and a station service standby section high-voltage power distribution device; the power supply system comprises a power plant switching device SID and a change-over switch connected with the power plant switching device SID in a signal manner; the change-over switch is in electrical signal connection with the high-voltage distribution device and the power voltage device; the station service switching device SID and the change-over switch are arranged in the station service switching system; the utility model has the beneficial effects that any boiler can drive any generator by the optimized station power switching structure, any generator can provide power for the standby section, and the starting and standby power is only used as a starting power supply of the power plant and a standby power supply when all generators are in power failure; the flexibility of the main pipe system operation unit is improved, the fact that the station service power supply is provided by the generator in normal operation can be achieved, the outsourcing electric quantity is reduced, and the economic benefit of power generation enterprises is increased.

Description

Station service power switching system for providing standby power for multiple generator sets

Technical Field

The utility model belongs to the field of electrical control, and particularly relates to a station service power switching system for providing standby power for a plurality of generator sets.

Background

Currently, for a small-sized power plant with a plurality of power generators, the wiring mode of the power plant is generally that a corresponding high-voltage (10 kV or 6 kV) working section bus is arranged below each power generator set, the working section provides power for each power generator and corresponding boiler and public load, the standby power is provided by one or more starting and standby power transformers, and the starting and standby power is provided by a 35kV or 10kV power grid of a national power grid. The specific wiring mode is shown in fig. 1.

The configuration and operation modes of the power supply switching device of the station service system with the wiring mode are as follows: a quick switching device for the station service is configured between a station service working power supply incoming line (1 DL) and a standby power supply (DL), the station service working power supply incoming line (1 DL) and the standby power supply incoming line (DL) are switched through the device, each generator provides power for a station service bus corresponding to the generator in normal operation, a standby section of the equipment under starting and standby is used as a standby power supply of each station section to operate in a hot standby mode, when a certain generator fails, the station service power supply switch of the station service is tripped, a bus switch is closed, station service power is switched to start the standby power supply, taking a 1# unit as an example, a 1# generator works in normal operation, the 1# station service working power supply switch 1DL is closed, the bus DL switch is opened, the standby transformer is started to operate in hot standby mode, the 1# unit service is powered by the 1# generator, and the standby power supply switch (2 DL) is closed. When the No. 1 generator fails, the No. 1 unit station service power switch 1DL is tripped, the bus-tie DL switch is closed, and the No. 1 unit station service power is switched to the starting standby power supply for power supply. And under the normal operation condition, the I, II, III and IV bus working power supplies are respectively provided with power supplies by respective generators or high-voltage power plants, the standby section of the equipment under the starting and standby power supply is used for providing standby power for each unit station power bus, and a station power quick-cutting device is adopted between each station power bus working power supply and the standby power supply.

At present, a thermal power plant with a plurality of steam turbine generator units usually adopts a unit system mode or a main pipe system mode, and for the unit adopting the main pipe system mode to operate, each boiler can be combined with any steam turbine generator unit to operate, but when the generator and the boiler are operated in different numbers, the plant power connection mode has a certain machine-furnace matching problem. Taking a certain thermal power plant shown in fig. 1 as an example, four generator sets are built in the power plant, four boilers are built in the power plant, the station electricity adopts 10kV voltage class, when the 2# boiler and the 3# generator of the power plant are operated in a combined mode, the 10kV II bus and the 10kV III bus of the power plant are required to be electrified to operate, the 2# generator does not work at this moment, and the 10kV II bus power supply of the power plant is required to be provided by a standby power supply so as to ensure that the boiler load and other loads supply power, and the generator sets and the boiler electricity are all provided by a power grid at this moment.

In the above case, the power plant electricity is partly provided by the power generated by the generator and partly by the grid (backup power). The part of the station service electricity provided by the standby power supply is not provided by the generator, and the network electricity provided by the generator is correspondingly increased. At this time, the power plant needs to pay electricity purchasing fees according to the commercial electricity price, the electricity purchasing price is executed according to the local electricity purchasing price, the increased power on line of the power plant is executed according to the power plant post internet electricity purchasing price, and the actual electricity purchasing cost of the power enterprise is as follows:

electricity purchase charge = actual electricity purchase quantity x (electricity purchase price-post internet electricity price).

Through investigation on a built thermal power plant, the actual condition of the power plant is that part of public load is supplied by a standby power supply because the original design long-term operation machine cannot operate at the current stage, so that the power plant generates part of outsourcing electric quantity, the expense generated by the outsourcing electric quantity is increased by hundreds of thousands of yuan per month according to the calculation method, and the benefit of the enterprise is influenced to a certain extent; this problem needs to be solved.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a station service power switching system for providing standby power for a plurality of generator sets, solve the problem of machine-furnace matching of a main pipe running set, and improve the flexibility of the main pipe running set; the original power supply switching mode of the plant is further optimized, so that any boiler can drive any generator in the optimized power supply switching mode of the plant, any generator can provide power for a standby section, the power supply can become standby power supplies of power supply systems of other power generating sets, and the starting and standby power supplies can be used only as power supply starting power supplies of the power plant and standby power supplies when all the power generators are in power failure. The optimized power plant switching mode can solve the problem of machine-furnace matching of the main pipe system operation unit, improves the flexibility of the main pipe system operation unit, can realize that the power plant load power supply is completely provided by the generator during normal operation, reduces the outsourcing electric quantity, and increases the economic benefit of power generation enterprises.

In order to solve the problems, the utility model adopts the following technical scheme:

a station service power switching system for providing standby power for a plurality of generator sets is used for switching a station service section high-voltage distribution device and a station service standby section high-voltage distribution device; the power supply system comprises a power plant switching device SID and a change-over switch connected with the power plant switching device SID in a signal manner; the change-over switch is connected with the electric signals of the high-voltage power distribution device and the power plant voltage device, the power plant switching device SID sends control instructions to the high-voltage power distribution device through the change-over switch, and the power plant switching device SID respectively collects data in the power plant high-voltage power distribution device and the power plant voltage device through the change-over switch.

Further, the service switching device SID and the change-over switch are arranged in the service switching system.

Further, the station service voltage device comprises a working I section for a 1# unit, a working II section for a 2# unit, a working III section for a 3# unit and a working IV section for a 4# unit; the service power switching device SID and the change-over switch are respectively connected with electric signals of the working I section, the working II section, the working III section and the working IV section.

Further, the system also comprises an electrical monitoring system ECS which is a master control system of the power plant electricity; the ECS is connected with the SID signal of the station service switching device.

Further, the system also comprises an ECS operator station, an engineer station/five-prevention host, a value station, a public measurement and control screen, a generator protection screen, a fault wave recording screen, a low-cycle low-voltage load shedding screen, a synchronization screen, a zone II switch and a zone I communication cabinet.

Further, the clock synchronization device for the electrical equipment time synchronization is also included.

Furthermore, the station power switching system and the high-voltage station power distribution device are connected in a hard-wired mode, and the connecting wire adopts a control cable;

the station power switching system and the public measurement and control screen are connected in a hard-wired mode, and a control cable is adopted as a connecting wire;

the factory electricity switching system and an electric monitoring system (ECS) adopt a network communication connection mode, and the connecting wire adopts a communication cable.

Compared with the prior art, the utility model has the remarkable beneficial effects that:

the optimized station power switching mode can realize that any boiler can drive any generator, any generator can provide power for a standby section, the station power switching mode becomes a standby power supply of station power systems of other power generating sets, and the station power switching mode is only used as a power plant starting power supply and a standby power supply when all the generators are in power failure.

The optimized power plant switching mode can solve the problem of machine-furnace matching of the main pipe system operation unit, improves the flexibility of the main pipe system operation unit, can realize that the power plant load power supply is completely provided by the generator during normal operation, reduces the outsourcing electric quantity, and increases the economic benefit of power generation enterprises.

Drawings

FIG. 1 is a schematic diagram of the wiring of the present utility model;

FIG. 2 is a schematic block diagram of the present utility model;

FIG. 3 is a schematic diagram of the wiring before modification;

FIG. 4 is a schematic block diagram of the prior art;

fig. 5 is a logic block diagram of the power switching of the present utility model.

In the drawings of which there are shown,

1-an electrical monitoring system ECS operator station; 2-engineer station/five-guard host; 3-value long station; 4-a station service switching device and a selection switch; 5-a public measurement and control device; 6-a generator protection screen; 7, a fault wave recording screen; 8-low-circumference low-pressure load shedding screen; 9-contemporaneous screen; a 10-II zone switch; 11-a high-voltage power distribution device for factories; a 12-I area communication cabinet; 13-clock synchronizer

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Example 1

As shown in figures 1-5 of the drawings,

the technical scheme architecture of the station service switching adopted by the utility model is as follows: building a station power switching device SID+a selector switch+an electric monitoring system ECS+a public measurement and control device+a station power high-voltage distribution device+a station power voltage device PT, wherein the station power switching device SID collects relevant signals of the station power voltage device PT and the station power high-voltage distribution device in a hard-wired mode and is connected with the station power high-voltage distribution device in a hard-wired mode, meanwhile, the station power switching device is connected with the electric monitoring system ECS in a communication mode, and is connected with the public measurement and control device (public measurement and control screen) in a hard-wired mode, so that control and monitoring of the station power system switching are realized.

According to the main wiring scheme of the station service system, the station service switching device completes the switching work of the station service high-voltage distribution device through the collection of station service high-voltage distribution device and station service voltage (PT) signals and the output of control signals, and simultaneously forms the station service switching system together with an electric monitoring system ECS, a public measurement and control device, the station service high-voltage distribution device, a selection switch, an electric operator station, a five-prevention host machine and the like, and achieves the functions of state monitoring, fault alarming, fault locking, electric protection and the like of the station service system and the station service switching device.

The factory electric voltage device (PT), the factory electric high-voltage distribution device and the change-over switch are connected by hard wire, the change-over switch selects the input signal, distinguishing the selected unit signals from the alternative unit signals, and ensuring that the signals collected by the station service power switching device are selected unit signals and the equipment controlled by the output signals are selected equipment;

the change-over switch is connected with the service power switching device SID by hard wire, the screened signals are sent to the service power switching device SID, the service power switching device SID carries out logic judgment and operation on the collected voltage signals of the service power voltage device PT and the status signals of the service power high-voltage power distribution device according to the operation requirement of the power plant, and the service power switching control command is determined to be sent under the condition that the switching condition is met.

The power plant switching device SID is connected with the high-voltage power plant distribution device in a hard-wired mode, a power plant switching instruction is sent by the power plant switching device SID to a control loop of the selected high-voltage power plant distribution device, the control of the selected high-voltage power plant distribution device is completed, meanwhile, related signals are sent to the power plant switching device SID through the hard-wired mode by the power plant switching device SID, the accuracy of the whole switching control process is judged by the power plant switching device SID, and the integrity of the switching process is confirmed.

The service power switching device SID is connected with the electric monitoring system ECS by hard wiring and communication, and important signals such as fault signals, protection signals, state signals, locking signals and the like of the service power switching device SID are connected into the public measurement and control device to be converged into the electric monitoring system (ECS) by the hard wiring mode, and are connected with the electric monitoring system (ECS) by the communication mode. Compared with the redundant wiring mode adopting only communication mode for connection, the redundant wiring mode adopting two connection methods has great advantages in the aspects of reliability, real-time performance and accuracy of signal transmission.

The key technical points of the scheme are as follows:

(1) The service power switching device SID + change-over switch + service power high-voltage distribution device is connected through a hard-wired mode, a mode of selecting a certain running generator to take a service standby section can be completed, the corresponding bus section of a non-running generator is not limited by a power supply provided by a starting standby change, the power supply is provided by the running generator, the running mode can solve the problem of machine-furnace matching of a main pipe running unit, the main pipe running unit is not limited by machine-furnace matching, and the steam turbine generator unit and a boiler can run more flexibly.

The power plant switching device SID+the change-over switch+the power plant high-voltage distribution device adopts a hard-wired connection mode, so that the accuracy of signal transmission is facilitated, signals such as protection actions of high-voltage power plant equipment can directly send out instructions such as protection action locking and the like to the power plant switching device SID, the accuracy of the hard-wired mode is higher for a communication mode, and misoperation and refusal of the power plant high-voltage distribution device caused by communication delay or faults can be prevented.

(2) The combined use of the station service switching device SID and the change-over switch can realize the selection and control of a plurality of units through one station service switching device SID, so that any one of the generators can provide power for a station service standby section. The number of the non-disturbance quick cutting devices is reduced, the workload of operators and the operation risk can be reduced, the production cost is saved, and the method is an optimized solution with the minimum investment.

(3) The SID+ change-over switch of the station power switching device is used in a combined mode, the number of signals of the monitored electrical equipment can be greatly reduced, the signals collected by the SID of the station power switching device are clear and definite, logic judgment and operation of the SID of the station power switching device are facilitated, the time from receiving signals to sending instructions of the SID of the station power switching device is reduced, the switching time requirement of a station power system is met, and the bus power failure problem caused by long switching time in the station power switching process is solved.

(4) The power plant switching monitoring system is composed of a power plant switching device SID, an electric monitoring system ECS and a public measurement and control device, a communication wiring mode is adopted between the power plant switching device SID and the electric monitoring system ECS, a hard wiring connection mode is adopted between the power plant switching device SID and the public measurement and control device, and an important signal adopts redundant arrangement, so that the safety operation is ensured. The ECS is responsible for monitoring and controlling the power plant switching system, the monitoring and controlling of the power plant switching system can be realized on an electric operator station of the ECS, the comprehensive monitoring of the power plant switching system by a power plant background can be realized on the electric operator station, and the remote control of the system can also be realized.

The technique of the present utility model will be described in further detail below with reference to the prior art (fig. 3, fig. 4) and the subsequent art (fig. 1, fig. 2).

As can be seen by comparing fig. 1 and 3, in the electrical primary system, the electrical primary elements of fig. 1 and 3 are unchanged, that is, the technology of the present utility model does not need to modify the electrical primary equipment, so as to save primary equipment investment.

As can be seen by comparing fig. 2 and fig. 4, for the electric secondary equipment, the utility model needs to add a set of service power switching device SID and a change-over switch, and the device can realize the switching of the power supply of the working section and the standby section of the four unit plants.

The utility model is characterized in that the combination of hardware devices is realized by adopting the prior art instead of the improvement of programs or method steps, and the used program control and other method steps.

Example 2

This embodiment is substantially the same in structure as embodiment 1,

a station service power switching system for providing standby power for a plurality of generator sets is used for switching a station service section high-voltage distribution device and a station service standby section high-voltage distribution device; the power supply system comprises a power plant switching device SID and a change-over switch connected with the power plant switching device SID in a signal manner; the change-over switch is connected with the electric signals of the high-voltage power distribution device and the power plant voltage device, the power plant switching device SID sends control instructions to the high-voltage power distribution device through the change-over switch, and the power plant switching device SID respectively collects data in the power plant high-voltage power distribution device and the power plant voltage device through the change-over switch.

The service power switching device SID and the change-over switch are arranged in the service power switching system.

The station service power voltage device comprises a working I section for a No. 1 unit, a working II section for a No. 2 unit and a working II section for a No. 3 unit

Working III section of the unit and working IV section for the 4# unit; the service power switching device SID and the change-over switch are respectively connected with electric signals of the working I section, the working II section, the working III section and the working IV section.

The system also comprises an electrical monitoring system ECS which is a general control system of the power plant electricity; the ECS is connected with the SID signal of the station service switching device.

The system also comprises an ECS operator station, an engineer station/five-prevention host, a value station, a public measurement and control screen, a generator protection screen, a fault wave recording screen, a low-cycle low-voltage load shedding screen, a synchronous screen, a zone II switch and a zone I communication cabinet.

A clock synchronizing device for the electrical device pair is also included.

The power switching system for the factories and the power distribution device for the high-voltage factories adopt a hard-wired connection mode, and a control cable is adopted as a connecting wire;

the station power switching system and the public measurement and control screen are connected in a hard-wired mode, and a control cable is adopted as a connecting wire;

the factory electricity switching system and an electric monitoring system (ECS) adopt a network communication connection mode, and the connecting wire adopts a communication cable.

The optimized power station switching system is provided with a power station switching system, and a power station switching device SID, a change-over switch, a communication interface and the like are arranged in a screen to form a complete power station switching system together with a high-voltage power station distribution device, an electrical monitoring system (ECS), a public measurement and control screen and the like.

The power switching system for the factories is arranged in an electronic equipment room of a power plant, and is arranged nearby equipment such as a public measurement and control screen, a generator protection screen, a fault wave recording screen, a low-cycle low-voltage load shedding screen, an I-zone communication cabinet, a clock synchronization device and the like, and the power distribution device for the high-voltage factories is arranged in a power distribution room for the high-voltage factories and a generator room.

The power switching system for the factories and the power distribution device for the high-voltage factories adopt a hard-wired connection mode, and the connecting wire adopts a control cable.

The power switching system for the factories and the public measurement and control device are connected in a hard-wired mode, and a control cable is adopted as a connecting wire.

The factory electricity switching system and an electric monitoring system (ECS) adopt a network communication connection mode, and the connecting wire adopts a communication cable.

An electric monitoring system (ECS) is used as a master control system of power plant electricity to monitor the power plant electricity switching system, meanwhile, the power plant electricity switching system can be remotely controlled, and an operator can send out an operation instruction on an electric operator station to complete the control of the power plant electricity switching system.

The power plant switching system can not only receive instructions to operate the power plant system by an electrical monitoring system (ECS), but also automatically judge the operation condition to operate the power plant system, and simultaneously receive the state signals of all key devices to ensure the safe and stable operation of the whole system.

The station service electricity switching system has the following functions:

1) The function of receiving remote control instructions issued by an electrical monitoring system (ECS) through communication transmission is achieved, and the function of switching the station service system is achieved according to the requirements of the electrical monitoring system (ECS);

2) The method can directly receive signals of voltage, state, fault, protection and the like of the power distribution device for the high-voltage plant, which are accessed through hard wiring, judge, analyze and logically operate the signals, and directly send out instructions to control the functions of the power distribution device for the high-voltage plant;

3) The power plant switching device SID has the function of selecting and controlling a plurality of units, reduces equipment investment and realizes the optimal configuration of a system;

4) The system has the capability of signal acquisition and outward transmission, and can send signals of state, fault, locking, protection and the like to an electrical monitoring system (ECS) to realize the monitoring of the electrical monitoring system (ECS) on the station service system.

The logic block diagram of the switching process of the station service is shown in figure 5.

Example 3

This embodiment is substantially the same in structure as embodiment 2,

station service switching device SID:

1. device architecture features

The standard 4U 19 inch reinforced unit case is designed to resist strong vibration and strong interference and is suitable for severe environments.

The integrated circuit is all industrial products or military products, and the device has high stability and reliability.

The main control CPU adopts a high-speed industrial RISC processor and supports the DSP extended instruction set.

The high-speed high-precision multipath A/D synchronous sampling technology is adopted, 64 points are sampled every week wave, and high measurement precision is ensured.

The software is based on a real-time embedded operating system and a TCP/IP protocol stack, and is stable, reliable and easy to expand.

A large-screen graphic liquid crystal display is adopted, and a full Chinese menu man-machine interaction interface is adopted; the electric main wiring diagram can be displayed in real time, various operation data and rich event records are displayed, the information is detailed and visual, and the operation and the debugging are convenient.

10 sets of protection fixed values can be independently set, and the fixed value area is safe and convenient to switch.

High capacity information recording function.

The strong switching wave recording function can record wave recording data up to 3 seconds at most in each switching operation, and the wave recording data comprise analog quantity, input quantity, output quantity and fixed value. The recording data can be observed on site on the liquid crystal screen of the device or can be uploaded through an Ethernet port and can be exported into a standard COMTRADE format file.

The protection settings and event records may be printed automatically or manually.

Multiple languages are supported, and online switching can be realized.

And the system has a strong communication function, supports double Ethernet and double RS485, and integrates various communication protocols such as IEC60870-5-103, modbus, IEC61850 and the like.

2. The main functions of the device are as follows:

and (3) a quick cutting function: the power supply has the function of rapidly completing switching between the working power supply and the standby power supply. The device can complete the switching initiated by different reasons, including: accident switching, abnormal working condition switching and manual switching. Each switching can select different switching modes and different switching criteria according to actual needs.

And the spare power automatic switching function: the device has a spare power automatic switching logic function, and can realize various combined operation modes of one bus-tie circuit breaker and four incoming line circuit breakers. The user can set the required scheme through setting parameters according to the own requirements.

The combined cutting and combined throwing functions: the combined cutting and switching function can be set or customized according to the actual working condition of the site. The method is mainly applied to cutting off or putting in certain specific power supplies or load branches before and after switching; the method can also be used for controlling the switching process and criteria, such as a switching control occasion with a self-contained generator on a bus. The switching and throwing functions are provided with throwing and retreating soft pressing plates, and the soft pressing plates can be independently set in the system fixed value according to the requirement.

The protection function: there is female antithetical couplet and inlet wire overcurrent protection, and main safeguard function includes: the primary connection overcurrent is protected by one section, two sections and post acceleration; the incoming line is protected in an acceleration way after overcurrent; each incoming line and bus are subjected to voltage-losing alarm protection; a TV disconnection warning function; and (5) two-stage low-pressure load shedding protection. The numerical value, time and throwing and retreating soft pressing plates of various protections can be independently set in the protection fixed value according to the requirement.

Acceleration function after start: after each switching, the device outputs a pulse width signal accelerated after starting to the protection, and the pulse width time can be set in a fixed value.

Automatic fault discrimination blocking function: the device judges whether an in-zone fault (the in-zone fault comprises a bus fault, a load on the bus and a power supply branch fault) occurs by detecting analog quantities such as bus voltage, incoming line current and the like; if an intra-zone fault occurs, the device will latch up to switch to prevent the backup power from being put into the point of failure.

Event recording function: the device has a set of functions for various events: the remote signaling event, the protection event, the wave recording event, the operation event and the self-checking event can be recorded by a user through the action time, the event name and the like of the page inquiry event of the 'event recall' of the liquid crystal screen.

Switching the wave recording function: the device starts to record waves after switching, the recording waves comprise 25 cycles before tripping (closing) and 50 cycles after starting, and the total recording time of each switching is 1.5 seconds and is twice. The device can store data of not less than 12 groups of wave recording, and wave recording content comprises information such as bus voltage, current, incoming line voltage, current, all incoming amounts and the like. The wave recording event index can be checked in the wave recording event, wave recording waveforms and data can be displayed on a liquid crystal screen in situ, and can also be transmitted to an electric monitoring system ECS for analysis and processing through network communication.

The device has powerful and reliable communication function. The device is provided with two Ethernet ports and 4 RS485 serial ports. The two RS485 interfaces and the two Ethernet interfaces can be used for communicating with monitoring background of different communication hardware interfaces. The system also comprises two RS485 serial ports, one for executing the printing function, and can be directly connected with a printer or a printing server to realize sharing of one printer by multiple machines; and the other is used for communicating with the GPS to realize the GPS time setting function.

3. The main plug-in of the device:

the device is composed of the following plug-ins: signal plug-in, power plug-in, CPU plug-in, AC plug-in, man-machine interface plug-in.

Power supply plug-in unit

The power module converts externally provided AC/DC power into various DC voltages required by the operation of the device. The module outputs +5V, +/-12V and +24V, +5V voltages for device digital circuits, +/-12V voltages for A/D sampling, +24V voltages for driving relays and optocoupler circuits for DI quantity input signals inside the device.

AC plug-in unit

The TV card accesses voltage quantities of 12 channels.

The TA card accesses 12 channels of current.

CPU plug-in

The CPU plug-in unit is composed of a main control CPU, an SDRAM, a Flash Memory, an A/D sampling chip and the like. The main control CPU is a high-speed RISC MPU,

and supporting the instruction set of DSP operation.

Signal plug-in unit

Signal boards are divided into two types: and (2) opening the plate (2).

The total number of the input plates is 2, and 24 paths of strong current input can be connected, the driving voltage is 220V or 110V DC, and the driving voltage is from the outside of the device.

The 1-in plug-in board can be connected with 16 strong electric inputs.

The 2-in plug-in board can be connected with 8 strong electric inputs.

The number of the opening plates is 2, and the number of the independent opening joints is 25.

Man-machine interface plug-in

The man-machine interface plug-in mainly refers to a front panel, and the front panel provides 9 keys, 16 signal lamps and a 320×240 liquid crystal screen for facilitating man-machine interaction, and simultaneously provides a network port for special testing by factories.

The switching mode of the station service electricity is implemented in a certain power plant, the switching mode can ensure that the station service electricity of the power plant is provided by the power generator of the power plant, and in the switching process, the station service electricity is not lost, and all equipment stably operates. Meanwhile, the power plant saves electricity charge by tens to hundreds of thousands of yuan every month, and provides powerful assistance for enterprise benefit.

The present utility model has been described in detail with reference to specific embodiments in the field, and those skilled in the art will understand that the actual operation is easy: in future implementations, the technical solutions described in the foregoing embodiments may be modified or some of the technical features thereof may 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 utility model.

At present, the technical scheme of the utility model has been subjected to pilot-scale experiments, namely small-scale experiments of products before large-scale mass production; after the pilot test is completed, the use investigation of the user is performed in a small range, and the investigation result shows that the user satisfaction is higher; now, the preparation of the formal production of the product for industrialization (including intellectual property risk early warning investigation) is started.

Claims (6)

1. A station service power switching system for providing standby power for a plurality of generator sets is used for switching a station service section high-voltage distribution device and a station service standby section high-voltage distribution device; the power supply system is characterized by comprising a service power switching device SID and a change-over switch connected with the service power switching device through signals; the change-over switch is respectively connected with the electric signals of the high-voltage power distribution device and the power supply voltage device of the plant, the power supply switching device SID sends control instructions to the high-voltage power distribution device through the change-over switch, and the power supply switching device SID respectively collects data in the high-voltage power distribution device and the power supply voltage device of the plant through the change-over switch.

2. A station service switching system for providing backup power to a plurality of gensets as recited in claim 1, wherein: the service power switching device SID and the change-over switch are arranged in the service power switching system.

3. A station service switching system for providing backup power to a plurality of gensets as recited in claim 1, wherein: the station service voltage device comprises a working I section for a 1# unit, a working II section for a 2# unit, a working III section for a 3# unit and a working IV section for a 4# unit; the service power switching device SID and the change-over switch are respectively connected with electric signals of the working I section, the working II section, the working III section and the working IV section.

4. A station service switching system for providing backup power to a plurality of gensets as recited in claim 2, wherein: the system also comprises an electrical monitoring system ECS as a power plant electrical master control system; the ECS is connected with the SID signal of the station service switching device.

5. A plant power switching system for providing backup power to a plurality of gensets as recited in claim 4, wherein: a clock synchronizing device for the electrical device pair is also included.

6. A plant power switching system for providing backup power to a plurality of gensets as recited in claim 4, wherein: the power switching system for the factories and the power distribution device for the high-voltage factories adopt a hard-wired connection mode, and a control cable is adopted as a connecting wire;

the station power switching system and the public measurement and control screen are connected in a hard-wired mode, and a control cable is adopted as a connecting wire;

the factory electricity switching system and an electric monitoring system (ECS) adopt a network communication connection mode, and the connecting wire adopts a communication cable.