CN103457285A

CN103457285A - Automatic switching device for intelligently controlling multiple transformers

Info

Publication number: CN103457285A
Application number: CN 201210175488
Authority: CN
Inventors: 孙民
Original assignee: LUOYANG HENGGUANG SPECIAL TRANSFORMER CO Ltd
Current assignee: LUOYANG HENGGUANG SPECIAL TRANSFORMER CO Ltd
Priority date: 2012-05-31
Filing date: 2012-05-31
Publication date: 2013-12-18

Abstract

Disclosed is an automatic switching device for intelligently controlling multiple transformers. The automatic switching device is applicable to power supply networks of large and medium factories, capacity of a controlled system is preset to be 10MW, and primary side voltage of the transformers is 10kV. A chip 80C51, developed and produced by Intel Company, in a single chip microcomputer in a MSC-51 series is selected for a control unit of the automatic switching device, and novel setting of hardware, a clock program and a keyboard program is adopted.

Description

Many automatic transformer switching devices of a kind of Based Intelligent Control

Technical field

The present invention relates to a kind of intelligent controlling device, many automatic transformer switching devices of especially a kind of Based Intelligent Control.

Background technology

Because the electricity consumption of all departments of enterprise is random, and daily load is inhomogeneous, season different transformers operational mode also be not quite similar, cause transformer all to be in underloading or no-load running state many times.Therefore the power factor of transformer descends, electric current increases, and electric current will produce larger power loss when flowing through transformer and circuit, not only makes the total active loss of factory's electric power system increase, and has also accelerated the ageing of insulation of transformer.Many automatic transformer switching devices of this Based Intelligent Control, can be according to the factory load situation of change, and reasonably the number of units of control transformer, make transformer as far as possible in the economical operation state, to reach energy-conservation purpose.This automatic switching device is that the 80C51 chip in MSC-51 series that adopts American I ntel company to manufacture and design turning on and off of control transformer.Simultaneously, this paper has also carried out analyzing and having proposed corresponding conservation measures to the loss on transformer magnetic circuit, is mainly that the iron core manufacture to transformer has adopted new material, new technology, new construction etc., and has carried out analysis and the discussion of energy-conservation aspect.

Summary of the invention

For the electricity consumption that overcomes all departments is random, and daily load is inhomogeneous, season different transformers operational mode also be not quite similar, cause transformer all to be in underloading or no-load running state many times.The total active loss of factory's electric power system is increased, also accelerated the ageing of insulation of transformer.The invention provides many automatic transformer switching devices of a kind of Based Intelligent Control, this device can not only apply to far distance automatic fling-cut equipment, and can move economically, reduce the transformer own loss.

The present invention solves the technical scheme that its technical problem takes: many automatic transformer switching devices of this Based Intelligent Control are applicable to the supply network of large and medium-sized factory, and the capacity of default controlled system is 10MW, and transformer primary side voltage is 10KV.The control section of this device is selected the 80C51 chip in the MSC-51 series monolithic of Intel company development and production, adopts the setting of novel hardware, timing routine and keyboard program.

The invention has the beneficial effects as follows: this device can not only apply to far distance automatic fling-cut equipment, and can move economically, reduce the transformer own loss.

Specific embodiments

One, Based Intelligent Control automatic transformer switching device design principle

The automatic transformer switching device of this paper design, mainly take 80C51 as core, by peripheral circuit forming control systems such as current transformer, sample resistance, comparator, LED display, timer clock circuit.

The intelligent operation/cutting system that adds design at the high-pressure section of transformer, this system has comprised individual timing system and two modules of power scale spare transformer automatic switching device.Wherein the master switch at power supply place uses hand switch, and power transformer commonly used and lighting transformer commonly used are all directly to access in power circuit, with control system, are not connected.And automatic switching device is mainly control power transformer on daytime and stand-by power transformer.

Factory be all generally daytime power load large, evening load is little, tends to be essentially 0, this can make transformer mostly in the time, carry out even no-load running of underloading evening, not only makes power factor descend and also makes electric energy run off in a large number.Design of Transformer timing automatic switching device is mainly the commuter time according to factory, utilizes clock circuit can automatically shut down after work the power transformer on daytime in the transformer of parallel running, improves the operational efficiency of transformer.If run into the situations such as factory's overtime work, can directly use keyboard to reset the turn-off time, reach the purpose of saves energy.

The factory that power consumption is large can be used spare transformer mostly, how reasonably using spare transformer is also an approach of transformer energy saving, it is to send into comparator after making Current Transformer, sample resistance to the power measurement of commonly using power transformer to compare that transformer is measured the power automatic switching device, preset daytime power transformer load and reach 90% of total capacity, as spare transformer will come into operation automatically while being greater than 90%.

This system reliability is high, and simple to operation.

Two, automatic switching device hardware designs

Native system hardware carries out modularized design.Module comprises the current signal collecting part, and LED shows part, relay part, and the composition such as other hardware modules.Wherein, because the current signal of current transformer output itself is just very high, access sample resistance and current signal can be converted into to voltage signal, do not divide so in back, add signal amplifying part.In experimental system, because the inner integrated program memory of journey 80C51 is enough, so there is no again the outside external storage section of adding.Electric current becomes voltage signal through the sample resistance current signal after by current transformer, through comparator relatively after, in three parallel branches daytime power transformer use power surpass the transformer total capacity 90% the time, signal will be transported to the interrupt pin INTT1 of P3.2 mouth in chip 80C51, chip is by after flowing to relay controller ULN2003 with extending out after parallel data delivery outlet output high level of address latch, amplify through diode 9013 relay closes that the loop of factory's spare transformer is controlled in rear drive, through 4 of CON10, the main contact of 5 pin wiring connection transformers, after the contact action closure, spare transformer comes into operation automatically.

The acquisition scheme of current signal:

First collecting size of current present in circuit through current transformer is specially: establishing and once surveying electric current is I1, and secondary side current is I2.If the electric current collected known is that the power that i consumes in known circuit is i * 100000 * 200W.Then current signal is converted to voltage signal through sample resistance.Then voltage signal is delivered in comparator, another input limb of comparator is set as 90% corresponding voltage signal of a typical transformer nominal load.Concrete is converted to, if electric current is R to the output rated voltage numeric ratio that is converted to secondary survey rated current and transmitter of voltage, normal voltage should be v standard=5A/R * 90%(V), when the power of power commonly used rises to 90% when above of transformer load, the process conversion finally input signal v is given to comparator and the v standard compares, and comparator can be exported a high level signal L.Because comparator is exported the interruption limb of directly linking single-chip microcomputer, so at this moment can trigger interruption, then spare transformer is connected to Factory Electricity Supply.

LED display part offshoot program:

After connecting LED interface CON19 partly and the CON19 of relay drive part docking mutually, LED shows that part will be linked in the automatic switching loop.Keyboard is succeeded on the pin 12 of electrical equipment drive part CON19.The access of LED display and keyboard makes size and the modification commuter time of observing power transformer power on daytime that convenience is provided; Simultaneously, the 80C51 chip is by 8 figure place code display tubes of 4511 Encoder driving common cathodes, and 4 common cathode digital display tubes are connected to the P1.3-P1.7 mouth of 80C51 by reverser, realize the Presentation Function of LED display.

The design of relay module:

The added voltage highest order of control system 5V because native system is used, can not directly be connected with high voltage side of transformer, so adopt this light current of relay to control the device of forceful electric power.So, because driver module is added in the higher centre of giving of drive current of relay, that the design uses is ULN2003, the one, 5V voltage can be risen to 50V, and can play the effect that level transforms, the 2nd, drive current is large.In the time will opening relay, allowing corresponding mouth connect high level just can be by the transformer place in circuit, and the phase reversal connection is low just can be disconnected switch.

The design of other hardware modules

Clock/calendar module: PCF8563 is multifunction timepiece/calendar chip that a technical grade of PHILIPS company release has extremely low power dissipation.The multiple warning function of PCF8563, timing function, clock input function and interrupt output function have been used for the timing function of various complexity.PCF8563 is little with its volume, low in energy consumption, with the leap year, automatically revises, and uses simply, and does not have Y2K problem.

After factory's working in morning, the timer clock circuit in the time after 8:00, the output high level, give relay controller ULN2003 after parallel port output, amplify through diode 9013 relay closes that factory's typical transformer is controlled in rear drive, through 6, the 8 pin output connection connection transformer main contacts of CON10, the contact action is closed, connect the power transformer on daytime, make it operation.On the contrary, the timer clock circuit is after time to afternoon 6:00, timer clock circuit output low level, give relay controller ULN2003 after parallel port output, the relay of controlling factory's typical transformer through 9013 rear drives disconnects, through 6, the 8 pin output connection connection transformer main contacts of CON10, the contact action disconnects, and transformer disconnects thereupon.If run into the situation of the interim overtime work of factory, only need to revise the turn-off time of timer clock.

Transformer automatic switching Design of System Software

The design of timing routine

Because PCF8563 itself is exactly clock hardware, so oneself can walk the clock that clock does not need to use single-chip microcomputer.

Keyboard program

The function of keyboard identification module is: identify various numerical keys and various function key, and complete the processing of numerical key and each function key.Press key is set in the time of each overtime work, the timing that then input is revised, after pressing acknowledgement key, microcomputer produces and interrupts, and in response, has no progeny, and reads key value and processes accordingly, and the rear interruption of finishing dealing with is returned.

Claims

1. many automatic transformer switching devices of a Based Intelligent Control, it is characterized in that: many automatic transformer switching devices of this Based Intelligent Control are applicable to the supply network of large and medium-sized factory, the capacity of default controlled system is 10MW, transformer primary side voltage is 10KV, the control section of this device is selected the 80C51 chip in the MSC-51 series monolithic of Intel company development and production, adopts the setting of novel hardware, timing routine and keyboard program.

2. many automatic transformer switching devices of a kind of Based Intelligent Control according to claim 1, it is characterized in that: automatic transformer switching device, mainly take 80C51 as core, by peripheral circuit forming control systems such as current transformer, sample resistance, comparator, LED display, timer clock circuit.

3. many automatic transformer switching devices of a kind of Based Intelligent Control according to claim 1, it is characterized in that: system hardware carries out module and comprises the current signal collecting part, and LED shows part, relay part etc.

4. many automatic transformer switching devices of a kind of Based Intelligent Control according to claim 1, it is characterized in that: PCF8563 itself is exactly clock hardware, so oneself can walk the clock that clock does not need to use single-chip microcomputer, the function of keyboard identification module is: identify various numerical keys and various function key, and complete the processing of numerical key and each function key.