CN205620746U - Accurate intelligent control device of transformer cooler based on AD sampling - Google Patents
Accurate intelligent control device of transformer cooler based on AD sampling Download PDFInfo
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- CN205620746U CN205620746U CN201620410501.1U CN201620410501U CN205620746U CN 205620746 U CN205620746 U CN 205620746U CN 201620410501 U CN201620410501 U CN 201620410501U CN 205620746 U CN205620746 U CN 205620746U
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Abstract
The utility model relates to an accurate intelligent control device of transformer cooler based on AD sampling, including central management module, several motor protection module, haul oneself willingly into module, man -machine interaction module and power module fully, the several cooler one -to -one of motor protection module and cooler group wherein, each motor protection module be used for gathering the institute correspond the cooler motor running state feed back extremely central management module, the module of hauling oneself willingly into fully be used for carrying out power supply according to main power source and stand -by power supply's state and switch, central management module be used for according to the work of each cooler fan motor and oil pump motor's running state control cooling ware group. Adopt the accurate intelligent control device of transformer cooler based on AD sampling of this kind of structure, device application wiring is simple, construction maintenance is convenient, the reliability is high, can carry out complicated air cooling motor protect function, realize full automatically cooling ware even running and condition monitor, has more extensive range of application.
Description
Technical field
This utility model relates to transformer safety and controls technical field, particularly relates to transformer cooler field of intelligent control technology,
Specifically refer to a kind of accurate intelligent controlling device of transformer cooler based on AD sampling.
Background technology
The cooler of forced-oil-air cooling transformator is by compositions such as fan, radiator, oil pipe, oil pump oil stream indicators.Cooling fan is
For discharging the hot-air emitted in heat exchanger, being fixed on cooler body with support, blowing forced by fan,
Radiator is made to cool down, so that the oil cooling in radiator.Radiator is arranged on transformator surface, is dissipated by transformer oil
Heat, thus cool down.Hot oil transfer in transformer body is cooled down by oil pipe to radiator, then is transmitted back to by the oil after cooling
Transformer body.Oil pump is contained in the bottom of cooler, makes the top oil of heat exchanger circulate to bottom, and it is by transformer body
Deep fat detach by force and be delivered to radiator and cool down, then the oil after cooling is transmitted back to transformer body, thus cools down change
Winding within depressor and iron core；For preferably cooling transformer oil, the most mostly using low speed oil pump, general rotating speed is
1450r/min.Oil stream instruction is contained in the obvious position, bottom of cooler, is beneficial to operations staff and observes the running status of oil pump.
About forced oil-circulation power transformer cooling system and operation in power transformer operating standard (DL/T 572 2010)
In condition, regulation wind cooling controller is to ensure transformer safety, economy, the indispensable corollary equipment of reliability service.In operating standard
Mandatory provision:
1, the most oil circulation cooling system must have two independent working powers and can automatically switch.When working power breaks down
Time, answer automatic put-in spair power source and send sound equipment and light signal；
2, strong oil circulation transformator, should send sound equipment and light signal when excising fault cooler, and automatically (water-cooled can hands
Dynamic) put into standby cooler；
3, the attached motor of fan, water pump and oil pump should have overload, short circuit and open-phase protection；Should there is supervision Oil pump electrical machinery rotation
Turn the system in direction；
4, the transformator of strong oil circulation cooling, should be able to be controlled the switching of cooler by temperature and (or) load.5, oil immersed type becomes
Depressor top-oil temperature is typically not to be exceeded the regulation (maker has specifying by maker of regulation) of table 1.When coolant temperature relatively
Time low, top-oil temperature reduces the most accordingly.The top-oil temperature of natural circulation cooling transformator typically should not often exceed 85 DEG C.
The general limit value of table 1 oil-filled transformer top-oil temperature
| The type of cooling | Cooling medium maximum temperature (DEG C) | The highest top-oil temperature (DEG C) |
| Natural Circulation is self cooling, air-cooled | 40 | 95 |
| Forced oil-circulation is air-cooled | 40 | 85 |
| Forced oil circulation water-cooling | 30 | 70 |
5, when strong oil circulation cooling transformator runs, it is necessary to put into cooler.Too much cooler should not be put into when zero load and underloading
(allowing under Light Condition not throw).The corresponding number of units of input cooler under various loads, should be by the regulation of maker.By temperature
The automatic system of degree and (or) load switching cooler should keep normal.
6, oil immersion (Natural Circulation) is air-cooled and dry type air cooling transformator, when fan quits work, it is allowed to load and the time of operation,
Should be by the regulation of maker.Oil immersed forced air cooled transform is after cooling system failure blowing-out is fanned, and when top-oil temperature is less than 65 DEG C, permits
Permitted band rated load operation.
7, forced oil-circulated air-cooled and strong oil circulation water-cooling transformator, when cooling system failure excises whole cooler, it is allowed to band volume
Fixed load runs 20min.As after 20min, top-oil temperature not yet reaches 75 DEG C, then allow to rise to 75 DEG C, but in this state
The maximum duration of lower operation must not exceed 1h.
The most domestic control device majority to high-power transformer forced oil-circulation air cooler is relay-type wind cooling controller,
Control and the protection of this control model still uses what dynamo-electric logical course loop realized, and its logic circuit is by various open circuits
The device compositions such as device, catalyst, thermorelay and electric fuse.
Owing to relay-type air-cooled control loop is made up of devices such as various choppers, catalyst, thermorelay and electric fuses,
So there is a lot of defect in its running, such as: the major loop of oil-immersed pump and cooler blower fan drives and uses catalyst,
Thus mechanical contact is many, circuit composition complexity, fault rate is high；The protected mode of motor is that electric fuse adds thermorelay, is only capable of
Motor is provided short circuit and overload (phase shortage) protection, it is impossible to carry out failure predication；Control device and use relay logical control,
Automaticity is low.For these reasons so that transformator be in operation reliability reduce, operation maintenance workload strengthen.With
Electrical network fast development in recent years, the raising of intelligence degree, unattended operation transformer station is on the increase, again due to large-scale
Transformator itself is worth higher, and the impact caused after damage is relatively big, thus requires that the reliability of Transformer Forced-Air Cooling System improves and energy
Temperature is carried out remote monitoring, it is achieved intelligentized control method, and traditional wind cooling controller can not complete.
After 2005, domestic occur in that the side automatically controlled realizing transformer cooling system with elements such as programmable controller PLC
Method, and achieve some New function, such as: according to the method for operation of certain periodic transformation cooling unit, make cooling unit
Blower fan group takes turns to operate, balances use；Communicate with integrated automation of transformation stations monitoring system, it is achieved remotely monitor.In control
Scheme aspect processed, has expert to propose control thinking the most reasonable, that optimize, as with oil temperature and rate of temperature change predict load,
By temperature and combine rate of temperature change and contact transformer station's practical situation again and carry out automatically controlling switching cooling unit, bear according to transformator
Lotus and oil temperature change comprehensive switching cooler package etc., temperature of oil in transformer can be made to meet the requirement that transformator runs, can reach again
Good energy-saving effect.But in actual application, the function that PLC realizes is fairly simple, interface operation is unfriendly, on-the-spot
The ins and outs of PLC are unfamiliar with by operations staff, and problem of investigating during fault is slow, even has no way of doing it, and affect chiller system event
Investigation in time and the process of barrier.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, it is provided that a kind of device utilization wiring is simple, construction
Easy to maintenance, reliability is high, can carry out complexity ventilated machine defencive function, realize full-automatic cooler equilibrium operating and operating mode
The accurate intelligent controlling device of transformer cooler based on AD sampling of monitoring.
To achieve these goals, this utility model has a following composition:
Should be based on the accurate intelligent controlling device of transformer cooler of AD sampling, it is mainly characterized by, during described device includes
Centre management module, several protective module for electric machines, prepared auto restart module, human-computer interaction module and power module, described electric motor protecting
Several cooler one_to_one corresponding of module and cooler package, and each protective module for electric machines is connected with corresponding cooler, institute
The prepared auto restart module stated is connected with described power module, described central management module respectively with described protective module for electric machines,
Power module is connected with prepared auto restart module, and described human-computer interaction module is connected with central management module.
It is preferred that described device also include opening into pair time module, described when opening pair the input of module with on transformator
Sensor is connected, described open into pair time module outfan respectively with described central management module, protective module for electric machines and
Prepared auto restart module is connected.
It is preferred that described device also includes outputing module, described module of outputing is connected with described central management module.
It is preferred that described prepared auto restart module include prepared auto restart analog acquisition unit, switch acquisition unit, arithmetic processor,
Storage chip, watchdog chip and output control circuit, described output control circuit is connected to arithmetic processor and described electricity
Between source module, the prepared auto restart analog acquisition unit described in input connection of described arithmetic processor and switch acquisition list
Unit.
It is preferred that each described protective module for electric machines include central processing unit, multi-channel A/D sampling channel, pre-filter circuit,
Phototube Coupling is opened into circuit and relay digital output circuit, and the input of described central processing unit is sampled by described multi-channel A/D
Passage, pre-filter circuit are connected with the motor of corresponding cooler, the input of described central processing unit also with photoelectricity
Keeping apart and be connected into circuit, the outfan of described central processing unit is connected with relay digital output circuit.
Have employed the accurate intelligent controlling device of transformer cooler based on AD sampling in this utility model, have the most useful
Effect:
(1) this utility model transformer cooler intelligent controlling device utilizes AD Sampling techniques comprehensive access transformer cooler
All analog quantitys in system and switching value, enormously simplify the hardware configuration of Transformer Forced-Air Cooling System, it is only necessary to adds some electricity
Current transformer and chopper, A.C. contactor just can build complete air cooling control device of transformer；
(2) backup power automatic switching function is integrated in device by this utility model, completes Transformer Forced-Air Cooling System power backup automatic switching merit
Can, integrate sampling, computing, logical judgment, execution function, it is not necessary to be further added by extra element；
(3) the integrated multiple protective module for electric machines of this utility model device, possess the overcurrent protection of transformer cooler motor, stall
The important electric motor protectings such as protection, fast tripping protection, open-phase protection etc., three-phase imbalance protection, collection sampling, computing, judge, hold
Row function is, it is not necessary to be further added by peripheral cell, and device uses modular construction, can protect module number by flexible motor, can
To adapt to the transformer cooling system of 4～8 groups of cooler package；
(4) this utility model integrated failure wave-recording function, can be by all hits when installation's power source, Cooler Fault generation
Upload according to preservation, for accident analysis.Device have open into pair time module, in device modules synchronous working, it is possible in fault
Precise time label is stamped to data during record ripple.
Accompanying drawing explanation
Fig. 1 is the structural representation of the accurate intelligent controlling device of transformer cooler based on AD sampling of the present utility model.
Fig. 2 is of the present utility model with reference to IEC standard and the hot spot temperature of winding of ieee standard with Transformer Insulation Aging speed
The schematic diagram of relation.
Fig. 3 is device main power source wiring system of the present utility model.
Fig. 4 is the structural representation of prepared auto restart module of the present utility model.
Fig. 5 is the structural representation of protective module for electric machines of the present utility model.
The structural representation of module when Fig. 6 is of the present utility model pair.
Detailed description of the invention
In order to more clearly describe technology contents of the present utility model, further retouched below in conjunction with specific embodiment
State.
On the one hand the transformer cooler intelligent controlling device that the present invention proposes have employed microcomputer measuring and controlling technology, it is achieved to transformer oil
Temperature, load, cooler running state information are collected, analyze and process, and according to oil temperature and loading condition, cool down
Control is moved back in the throwing of device so that it is oil temperature maintains in a fixing scope.On the other hand device possesses complete electric motor protecting algorithm,
8 groups of coolers, the protection of 16 motors, adjusting of each electric motor protecting 5 kinds of flow-through curve of minimum support can be supported simultaneously.
After electrical fault, device can automatically generate wave file, records whole failure process.Additionally possess power supply prepared auto restart algorithm,
Realize the backup power automatic switching function of I, II section power supply, wave file can be automatically generated when prepared auto restart action simultaneously, record whole fault
Process, supervision information and analysis result thereof are shown with directly perceived, visual means in this locality, and in time on deliver to Surveillance center.
Be that transformator is reliable, safety, the technical guarantee of economical operation, be professional's intelligent decision and assessment transformator and cooler fortune
The support equipment of row situation.
The present invention, based on modularized design, by central management module, electric motor protecting control module (8), prepared auto restart module, opens
Module when entering pair, output the composition such as module, power module.As shown in Figure 1.
Central management module is connected by bus and other electric motor protecting control modules, prepared auto restart module, and other modules will gather number
Periodically upload to central management module according to information such as, ruuning situations, central management module record store, analyzing and processing；Central authorities
The switching of the management module unified management each power supply of whole chiller system, the switching of each cooler package；Record stores each submodule
Alarm event and action event, produce form, help operating analysis afterwards；And there is Ethernet communication interface, can receive remote
Side's control command of issuing of network and on send system data.
Electric motor protecting control module has operation independent analysis ability, can independently carry out overcurrent protection, stall according to sampled signal
The important electric motor protecting ruling such as protection, fast tripping protection, open-phase protection etc., three-phase imbalance protection, simultaneously can by sampled data,
Operation results etc. make systematic analysis by giving central management module on serial ports.
Prepared auto restart module has operation independent analysis ability, can independently realize power supply prepared auto restart handoff functionality according to sampled signal,
Sampled data, operation result etc. can be made systematic analysis by giving central management module on serial ports simultaneously.
Open into pair time module possess and open into collection and time adjustment function: can gather transformator high-side switch, middle side switch, oil temperature is high
Node location signal, assistant analysis transformator operation conditions, can access GPS clock signal simultaneously, carry out the IRIG-B time
Code decoding, and give central management module and each protective module for electric machines, backup power automatic switching function by temporal information by internal system bus
When module is carried out pair.
Output module directly by central management module control, in Cooler Fault, cooler full cut-off fault, system dead electricity, system
Under the failure conditions such as exception, externally send alarming node signal.
Human-computer interaction module, uses 7 cun of industrial touch screen, has abundant picture, easy and simple to handle.
Power module, possesses alternating current-direct current redundancy access port, fan-free, output 12V power supply supply digital system circuit, 24V electricity
Source supply input and output circuit.
As it is shown in figure 1, the present invention has a backboard, backboard having RS485 and multiple local bus, central management module is led to
Crossing bus and other electric motor protecting control modules, prepared auto restart module connects, and other modules will gather the information such as data, ruuning situation
Periodically upload to central management module, central management module record store, analyzing and processing；Central management module unified management is whole
The switching of each power supply of individual chiller system, the switching of each cooler package；Record stores alarm event and the action event of each submodule,
Produce form, help accident analysis；And there is ethernet interface, can receive control command that distant place network issues and
Upload unit state, action event, fault recorder data etc..
One, apparatus of the present invention are based on extensive AD Sampling techniques, and temperature of oil in transformer signal, transformer load electric current are passed through AD
After sampling, through operational analysis, as the Rule of judgment of transformer cooler switching.
1, according to the field operation experiences of transformator, we constrain in transformer load electric current and reach the 70% of rated load current
Time and above time, cooler package all puts (6 groups of inputs, 2 groups are standby) into operation；When load current is less than rated load current
70% time, the input of cooler is carried out according to oil temperature and hot(test)-spot temperature criterion.
2, control analytic expression is constituted with top-oil temperature, top-oil temperature rate of change and shared weight thereof, and with oil temperature rate of change for depending on
According to carrying out the control of switching delay time,
Wherein, Θk=this transformator top-oil temperature sampled value
Θk-1=last time transformator top-oil temperature sampled value
The weight factor of α=transformer load variable quantity accounting
β=change relevant cooler switching time delay weight factor to transformer temperature
As a example by ABB transformator, when the numerical value of Θ is respectively at switching definite value such as 50 DEG C～53 DEG C, 53 DEG C～57 DEG C, 57 DEG C～60 DEG C
Hereinafter, system is separately operable 2,4,6 groups of coolers, and makes working group's number on both sides, transformator north and south equal or difference 2 groups,
Θk-Θk-1It is 2 minutes interior variable quantities, time properly functioning, the size of this value reflection transformer load variable quantity.Weight factor
Want suitable value, when load is increased or decreased, although oil temperature Θ is also not reaching to setting, then make according to the variable quantity of load
Input in advance that cooler is suitable or premature excision, the switching that can make cooler is forward-looking.Reflection cooler switching simultaneously
The weight factor of delay time also suitable value, when load increases, can cause oil temperature rapid increase, Θk-Θk-1Quickly increase,
The making time of cooler is just along with Θk-Θk-1Increase and reduce；When the load is decreasing, due to transformator radiating effect relatively
Slowly, Θk-Θk-1Reduction and suitably increase, the most just do not result in the frequent switching of cooler, make system operate steadily in order.
Relatively more existing PLC wind cooling controllers only switch bar with transformator top-oil temperature or load current as controlling cooler
Part, the present invention increases and controls cooler package operation with hot-spot temperature of transformer for condition, makes temperature of oil in transformer obtain the most accurate
Control.Following table is with reference to IEC standard and the hot spot temperature of winding of ieee standard and the relation of Transformer Insulation Aging speed.
As in figure 2 it is shown, with when hot spot temperature of winding is at 98 DEG C, FIEC=100% is reference, if hot(test)-spot temperature is from 18 DEG C
Increasing to 116 DEG C, FIEC=8, i.e. insulation ag(e)ing rate reach 800%, are 8 times when 98 DEG C；If hot(test)-spot temperature is from 18 DEG C
Increasing to 80 DEG C, FIEC=0.125, insulation ag(e)ing rate is 12.5%, 12.5% when only 98 DEG C.
Hot(test)-spot temperature is generally not capable of being obtained by directly sampling, it is necessary to obtained by mathematical calculation, the present invention referring concurrently to IEC and
IEEE, proposes new computation model as follows:
Hot(test)-spot temperature Θ of natural-draft transformerh=Θo+HgrKy
Hot(test)-spot temperature Θ of forced-oil-air cooling transformatorh=Θb+2[ΔΘimr-ΔΘbr]Ky+HgrKy
It should be noted that transformator top-oil temperature can be more slightly higher than focus oil temperature under certain load, the therefore heat to forced-oil-air cooling transformator
Point temperature has a correction Θ 'h=Θh+0.15(Θh-Θhr), for forced-oil-air cooling transformator Θh–Θhr>0
Wherein, Θo=top-oil temperature
Hgr=focus top-oil temperature gradient
K=load coefficient (load current/rated current)
Y=is around class index
ΔΘimr=averagely rise oil temperature (declared working condition)
ΔΘbr=bottom rises oil temperature (declared working condition)
Θb=bottom oil temperature
Θhr=specified hot(test)-spot temperature
K in IEC standard > 1 (in the case of load exceedes the 100% of rated current).
With with top-oil temperature for according to equally, after reasoning computing obtains hot-spot temperature of transformer, controlling cold with hot(test)-spot temperature for condition
But, during device switching, formula is applied mechanically equallyΘkSubstitute into this coiling hot point of transformer temperature, Θk-1Substitute into Transformer Winding last time
Hot(test)-spot temperature, the suitable value of weight factor α, β, as a example by ABB transformator, when Θ numerical value respectively 65 DEG C～68 DEG C,
68 DEG C～72 DEG C, 72 DEG C～less than 75 DEG C, system is separately operable 2,4,6 groups of coolers.Hot(test)-spot temperature condition is more excellent than oil temperature condition
First, if i.e. hot(test)-spot temperature arrives first at switching threshold values, cooler package can switch over action.
In actual application, transformer load current variation speeds is more faster than transformer body oil temperature pace of change, coiling hotspot temperature
After degree change, reflection has also needed to a process to transformator shell temperature, and temperature of oil in transformer is also by ambient temperature, appearance
The factor impacts such as heat radiation, so temperature of oil in transformer is only as the foundation of a fuzzy control.Present invention oil temperature combines focus temperature
Degree makees the switching foundation of cooler package, makes system more can accurately control the working oil temperature of transformator.
Two, tradition wind cooling controller uses complicated relay circuit to build and realizes power supply backup power automatic switching function.Apparatus of the present invention based on
Extensive AD Sampling techniques, are integrated into backup power automatic switching function in a module, and module has prepared auto restart analog acquisition, switch
Amount gathers, arithmetic processor, storage chip, watchdog chip, output control circuit.Module accesses air cooling system power supply two
The three-phase voltage of inlet wire, three-phase current signal, bus three-phase voltage signal samples, operational analysis, in conjunction with power circuit breaker,
Catalyst location status information, then according to prepared auto restart logical judgment, carries out the seamless switching of two sections of incoming powers: work as main power source
When having electricity, use main power source, when main power source decompression or abnormal time, automatically switch to stand-by power supply, and main power source replied normal
Time switch back into main power source again, it is ensured that system power good is reliable.
It is illustrated in figure 4 the structural representation of prepared auto restart module, the three-phase of the three-phase voltage of two sections of power supplys, three-phase current and bus
Voltage after pre-filtering through high-speed AD sample conversion be digital signal, CPU by high-speed sample data through Fourier transport
Calculate, carry out prepared auto restart logical judgment in conjunction with two sections of power circuit breakers, work as mains power failure, when meeting stand-by power supply switching condition,
CPU sends trip signal, jumps exit relay through Phototube Coupling, the peripheral A.C. contactor action of order, and main power source exits disconnection,
In-put of spare power supply.The position of the switch of prepared auto restart module samples chopper, catalyst simultaneously, proofreads with performing action command.
When stand-by power supply works, and main power source recovers, CPU detects that main power voltage recovers, and CPU sends trip signal, makes standby
Power supply exits disconnection, and main power source puts into.Prepared auto restart module has high speed SPI communication interface, can manage module with CS central
Communication, accepts power supply throwing and moves back order and upload the current state of power supply.Module has high speed eeprom simultaneously, in order to preserve fault
Current waveform data, makees follow-up to trace analysis.Module also has independent watchdog circuit, it is ensured that module stability reliably working.
Such as the structural representation that Fig. 4 is prepared auto restart module.
Device introduces each three-phase voltage (Ua1, Ub1, Uc1, Ua2, Ub2, Uc2) of two inlet wires and each extraction electricity
The three-phase voltage (Ua, Ub, Uc) of stream (Ix1, Ix2) and bus, for the logic discrimination of inlet wire prepared auto restart, additionally introduces
The position of two lead-in circuit breaker CB1 and CB2 is for the differentiation of system operation mode.Hereinafter suppose that 1# inlet wire is primary power cource,
2# inlet wire is stand-by power supply.
The ultimate principle of inlet wire prepared auto restart is: after working bus bar causes decompression due to fault or chopper jump, tripping is with former
Working power be connected chopper (in order to avoid stand-by power supply He Zhong Library), check backup power source voltage qualified after, close with
The chopper that stand-by power supply is connected.Prepared auto restart logic includes discharge and recharge logic and action logic.
1, inlet wire prepared auto restart discharge and recharge logic
(1) recharge logic: after meeting following all conditions, puts inlet wire prepared auto restart charge flag through 15S time delay.
A. bus has pressure (Ua, Ub, Uc have been all higher than compression set value)；
B.1# service entrance switch CB1 is closing position, and 2# service entrance switch CB2 is in a point position；
C., when prepared auto restart inspection has pressure to put into, 2# inlet wire has pressure (Ua2, Ub2, Uc2 have been all higher than compression set value)；
(2) electric discharge logic: when meeting following either condition, inlet wire prepared auto restart discharges immediately, removes charge flag.
A.2# service entrance switch CB2 is closing position, time delay 2 seconds；
C., when prepared auto restart inspection has pressure to put into, 2# inlet wire is without pressure (Ua2, Ub2, Uc2 are less than without compression set value any one), time delay 2
Second；
D.1# service entrance switch CB1 refuses to jump；
E. prepared auto restart allows pressing plate to exit, or have prepared auto restart locking open into, or inlet wire prepared auto restart control word exits；
2, inlet wire prepared auto restart action logic
When meeting following condition, through inlet wire prepared auto restart tripping operation time delay tripping 1# service entrance switch CB1:
A. bus loss of pressure (Ua, Ub, Uc are respectively less than without compression set value)；
B., when prepared auto restart inspection has pressure to put into, 2# inlet wire has pressure (Ua2, Ub2, Uc2 have been all higher than compression set value)；
D. the charging of inlet wire prepared auto restart is the fullest；
E. inlet wire prepared auto restart control word put into, without prepared auto restart locking open into.
After inlet wire prepared auto restart sends jumping CB1 order, if being not detected by CB1 position in 5 seconds by closing variation, then send out CB1
Refuse to jump warning signal, and inlet wire prepared auto restart is discharged；If confirmed 1# service entrance switch position CB1 is by closing variation, through entering
Line prepared auto restart combined floodgate time delay sends conjunction 2# service entrance switch CB2 order, closes by a point change if being not detected by CB2 position in 5 seconds,
Then send CB2 to refuse to close warning signal.
3, inlet wire prepared auto restart self-recoverage
After inlet wire prepared auto restart action, when device detects that trouble power restores electricity, disconnect standby service entrance switch, again close
Fault service entrance switch recovers the power supply of primary power cource, and the running status before automatically making device return to prepared auto restart action, inlet wire is standby
Haul oneself willingly into self-recoverage action once.When, after self-recoverage baulk, device comes back to the running status before self-recoverage action no longer
Self-recoverage, device sends the warning signal that inlet wire prepared auto restart self-recoverage is failed simultaneously.
(1) recharge logic: after meeting following all conditions, puts segmentation prepared auto restart self-recoverage charge flag through 15S time delay.
A. the action of inlet wire prepared auto restart and detect Backup Power Switch CB2 close position, time delay 5 seconds；
B. bus has pressure (Ua, Ub, Uc have been all higher than compression set value)；
C. primary power cource switch CB1 is in a point position.
(2) electric discharge logic: when meeting following either condition, inlet wire prepared auto restart self-recoverage discharges immediately, removes charge flag.
A. primary power cource switch CB1 is closing position, or Backup Power Switch CB2 is in a point position, time delay 2 seconds；
C. Backup Power Switch CB2 refuses to jump；
D. prepared auto restart self-recoverage allow pressing plate to exit, have prepared auto restart locking open into, or inlet wire prepared auto restart self-recoverage control word exits.
(3) action logic:
When meeting following condition, through inlet wire prepared auto restart self-recoverage tripping operation time delay tripping Backup Power Switch CB2:
A. primary power cource inlet wire has pressure (Ua1, Ub1, Uc1 have been all higher than compression set value)；
B. the charging of inlet wire prepared auto restart self-recoverage is the fullest.
After inlet wire prepared auto restart self-recoverage sends the standby service entrance switch CB2 order of jumping, open if being not detected by stand-by power supply in 5 seconds
Pass CB2 by closing variation, then sends out auxiliaries-supply circuit-breaker CB2 and refuses to jump warning signal, and put inlet wire prepared auto restart self-recoverage
Electricity；If confirmed Backup Power Switch CB2 is by closing variation, send conjunction primary power cource through inlet wire prepared auto restart self-recoverage combined floodgate time delay
Switch CB1 order, is closed by a point change if being not detected by primary power cource switch CB1 in 5 seconds, then sends primary power cource open circuit
Device CB1 refuses to close warning signal, and Backup Power Switch CB2 of again closing, and makes device be restored to inlet wire prepared auto restart self-recoverage
The method of operation before action.
Three, device is integrated with multiple electric motor protecting control module, and electric motor protecting control module independently becomes a mini system, the most solely
Vertical operation, does not interfere with each other, the corresponding one group of cooler package of each electric motor protecting control module, gives one group of cooler package internal fan electricity
Machine and the protection completely of Oil pump electrical machinery.
PLC type wind cooling controller cannot accomplish the electric motor protecting function of complexity, because its core cell is not provided that more adopting
Sample passage and operational capability at a high speed.The electric motor protecting control module of this device uses high-performance microprocessor, can at most synchronize to adopt
The analog quantity of sample 12 passage and the switching value of 16 passages, single analog quantity channel sample frequency reaches 600Hz/s, meets and carry out
The computing requirement of electric motor protecting analysis and requirement of real-time.As it is shown in figure 5, motor controls protection module has central authorities' process
Device, multi-channel A/D sampling channel and pre-filter circuit thereof, there is Phototube Coupling and open into circuit, and the relay through Phototube Coupling
Device digital output circuit, can directly control external communication catalyst.
Cooler fan electromotor three-phase current, Oil pump electrical machinery three-phase current after pre-filtering through high-speed AD sample conversion for number
Word signal, high-speed sample data through Fourier computing, is obtained current value and protects definite value to compare with setting, protect by CPU
Logical judgment, the trigger protection action when electric current exceedes definite value, CPU sends out trip signal after the delay time set, passes through
Phototube Coupling jumps exit relay, and the peripheral A.C. contactor action of order, fault cooler package is out of service.Motor controls to protect simultaneously
Protect the position of the switch of module samples chopper, catalyst, proofread with performing action command.Motor controls protection module to be had
RS485 communication interface, can manage module communication with CS central, receive cooler package start-stop order and upload cooler package
Current state.Module has high speed eeprom simultaneously, in order to preserve fault current waveform data, makees follow-up to trace analysis.Module
Also has independent watchdog circuit, it is ensured that module stability reliably working.
If Fig. 5 is the structural representation that motor controls protection module.
Four, device tool open into pair time module, IRIG-B differential signal can be accessed, be decoded, then by the decoded time
Information sends, and when carrying out pair to CS central management module, prepared auto restart module, protective module for electric machines, makes whole system mould
Block works asynchronously, and can stamp unique timescale data to fault data when system jam, facilitate emergency review analysis.
As shown in Figure 6, when IRIG-B pair, module receives IRIG-B timing code, becomes logic level signal through level conversion, defeated
Enter to fpga chip, FPGA be decoded computing, then export on serial port, the string of the serial port access system of module
Row bus, hangs over the equipment in bus and can obtain temporal information.
In the technical scheme of the accurate intelligent controlling device of transformer cooler based on AD sampling of the present utility model, wherein wrapped
Each function device included and modular system all can be corresponding to actual particular hardware circuit structure, therefore these modules and unit
Merely with hardware circuit it is achieved that and be purely acting as realizing the hardware foundation controlling software of specific control function and put down
Platform, its technical scheme required for protection itself does not include the control software for realizing this specific control function.
Have employed the accurate intelligent controlling device of transformer cooler based on AD sampling in this utility model, have the most useful
Effect:
(1) this utility model transformer cooler intelligent controlling device utilizes AD Sampling techniques comprehensive access transformer cooler
All analog quantitys in system and switching value, enormously simplify the hardware configuration of Transformer Forced-Air Cooling System, it is only necessary to adds some electricity
Current transformer and chopper, A.C. contactor just can build complete air cooling control device of transformer；
(2) backup power automatic switching function is integrated in device by this utility model, completes Transformer Forced-Air Cooling System power backup automatic switching merit
Can, integrate sampling, computing, logical judgment, execution function, it is not necessary to be further added by extra element；
(3) the integrated multiple protective module for electric machines of this utility model device, possess the overcurrent protection of transformer cooler motor, stall
The important electric motor protectings such as protection, fast tripping protection, open-phase protection etc., three-phase imbalance protection, collection sampling, computing, judge, hold
Row function is, it is not necessary to be further added by peripheral cell, and system uses modular construction, can protect module number by flexible motor, can
To adapt to the transformer cooling system of 4～8 groups of cooler package；
(4) this utility model integrated failure wave-recording function, can be by all hits when installation's power source, Cooler Fault generation
Upload according to preservation, for accident analysis.Device have open into pair time module, in device modules synchronous working, it is possible in fault
Precise time label is stamped to data during record ripple.
In this description, this utility model is described with reference to its specific embodiment.But it is clear that still may be made that
Various modifications and alterations are without departing from spirit and scope of the present utility model.Therefore, specification and drawings is considered as illustrative
And nonrestrictive.
Claims (5)
1. the accurate intelligent controlling device of transformer cooler based on AD sampling, it is characterised in that described device includes
Central management module, several protective module for electric machines, prepared auto restart module, human-computer interaction module and power module, described motor is protected
Protect several cooler one_to_one corresponding of module and cooler package, and each protective module for electric machines be connected with corresponding cooler,
Described prepared auto restart module is connected with described power module, described central management module respectively with described electric motor protecting mould
Block, power module are connected with prepared auto restart module, and described human-computer interaction module is connected with central management module.
The accurate intelligent controlling device of transformer cooler based on AD sampling the most according to claim 1, it is characterised in that
Described device also include opening into pair time module, described when opening pair the input of module be connected with the sensor on transformator,
Described open into pair time module outfan be connected with described central management module, protective module for electric machines and prepared auto restart module respectively
Connect.
The accurate intelligent controlling device of transformer cooler based on AD sampling the most according to claim 1, it is characterised in that
Described device also includes outputing module, and described module of outputing is connected with described central management module.
The accurate intelligent controlling device of transformer cooler based on AD sampling the most according to claim 1, it is characterised in that
Described prepared auto restart module include prepared auto restart analog acquisition unit, switch acquisition unit, arithmetic processor, storage chip,
Watchdog chip and output control circuit, described output control circuit is connected between arithmetic processor and described power module,
The prepared auto restart analog acquisition unit described in input connection of described arithmetic processor and switch acquisition unit.
The accurate intelligent controlling device of transformer cooler based on AD sampling the most according to claim 1, it is characterised in that
Each described protective module for electric machines includes that central processing unit, multi-channel A/D sampling channel, pre-filter circuit, Phototube Coupling leave
Entering circuit and relay digital output circuit, the input of described central processing unit is by described multi-channel A/D sampling channel, preposition
Filter circuit is connected with the motor of corresponding cooler, and the input of described central processing unit is also opened into electricity with Phototube Coupling
Road is connected, and the outfan of described central processing unit is connected with relay digital output circuit.
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| CN201620410501.1U CN205620746U (en) | 2016-05-09 | 2016-05-09 | Accurate intelligent control device of transformer cooler based on AD sampling |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN111504503A (en) * | 2020-04-28 | 2020-08-07 | 广东电网有限责任公司 | Cooling control system of power transformer |
| CN113885391A (en) * | 2021-10-18 | 2022-01-04 | 西安微电子技术研究所 | Dual-redundancy steering engine switching instruction interface circuit and instruction switching method |
| CN114089794A (en) * | 2021-11-05 | 2022-02-25 | 国网天津市电力公司电力科学研究院 | Control method for cooling system of oil-immersed air-cooled transformer |
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2016
- 2016-05-09 CN CN201620410501.1U patent/CN205620746U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN111504503A (en) * | 2020-04-28 | 2020-08-07 | 广东电网有限责任公司 | Cooling control system of power transformer |
| CN113885391A (en) * | 2021-10-18 | 2022-01-04 | 西安微电子技术研究所 | Dual-redundancy steering engine switching instruction interface circuit and instruction switching method |
| CN113885391B (en) * | 2021-10-18 | 2023-05-16 | 西安微电子技术研究所 | Dual-redundancy steering engine switching instruction interface circuit and instruction switching method |
| CN114089794A (en) * | 2021-11-05 | 2022-02-25 | 国网天津市电力公司电力科学研究院 | Control method for cooling system of oil-immersed air-cooled transformer |
| CN114089794B (en) * | 2021-11-05 | 2022-07-29 | 国网天津市电力公司电力科学研究院 | Control method for cooling system of oil-immersed air-cooled transformer |
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