CN201256048Y

CN201256048Y - Intelligent control device for transformer cooler

Info

Publication number: CN201256048Y
Application number: CNU2008200292620U
Authority: CN
Inventors: 职迎安; 马瑜
Original assignee: China XD Electric Co Ltd
Current assignee: China XD Electric Co Ltd
Priority date: 2008-06-03
Filing date: 2008-06-03
Publication date: 2009-06-10
Anticipated expiration: 2018-06-03

Abstract

The utility model discloses an intelligent control device of a transformer cooler, which comprises a host computer and a programmable logic controller, wherein the host computer is arranged in a control chamber, and the programmable logic controller is arranged in a control cabinet, the programmable logic controller is integrated with a host module CPU, an analog quantity input module, an analog quantity output module, a switching value input valve and a switching value output value, and the programmable logic controller is in bidirectional signal connection with the host computer through a communication interface of the host module CPU. The intelligent control device is characterized in that the analog quantity input module receives oil temperature input signals from a transformer oil-surface temperature controller, the switching value input module receives operation signals from the transformer cooler, the switching value output module outputs control signals to an actuating mechanism of the transformer cooler through a transducer, and the analog quantity output module outputs operation frequency adjusting signals to the actuating mechanism of the transformer cooler through the transducer.

Description

A kind of intelligence controlling device of transformer cooler

Technical field

The utility model relates to a kind of intelligence controlling device of transformer cooler.

Background technology

Transformer bulk temperature in service changes the influence that is subjected to transformer loss and ambient air temperature.Transformer load is big more, and then loss is big more, and the temperature rise of transformer is just high more; Load variations is big more, and the variations in temperature of transformer increases just fast more with Changes in weather and power load, and it is high more that the temperature rise of transformer becomes; Even on the same day, because the variation of the variation of diurnal temperature and load peak-valley difference superposes a principal element that causes the transformer temperature to change significantly especially.Owing to above reason, cause the transformer temperature in continuous variation, thereby have influence on the long-term safety operation of transformer.The temperature of transformer is too high can quicken ageing of insulation, shortens the useful life of transformer.Therefore when the transformer oil temperature rise, the required cooling capacity of transformer also will increase; And when temperature of oil in transformer reduces, the required cooling capacity of transformer also will reduce.For the transformer temperature can be remained in the reasonable range, the transformer cooling system control becomes logic " manually " and " automatically " control mode.Controlling object is the cooler of chip, tubular radiator, comprises the power supply control of fan electromotor and Oil pump electrical machinery.

The type of cooling of existing transformer mainly contains following several: the above forced-oil-air cooling cooler of (1) 220kV (YF type).Its " automatically " control mode can be divided into " work ", " assisting " and " standby " three kinds of states.When the transformer top-oil temperature reaches 65 ℃, drop into auxiliary cooler automatically, withdraw from when dropping to 55 ℃.When the cooler package of " work ", the operation of " assisting " state breaks down, the cooler package that drops into " standby " state automatically.According to the load condition of ambient temperature, can manually select to adjust the operating state of several groups of coolers, at least one group of cooler running generally all is set in the transformer running.(2) the air-cooled cooler of the strong oily gilled radiator of 220kV (PC type).It does not have independently to belong to the fan and the oil pump of each cooler, and operating state is three kinds of " self cooling ", " air-cooled " and " forced-oil-air cooling ".(3) 110kV forced air cooler (radiator).

There is following shortcoming in the control of the above type of cooling: 1. the cooling capacity of cooler can not smoothly change continuously, can only the classification adjustment, change more singlely, and underaction can not adapt to the needs of the growing intellectuality control of factory, power station.Because the auxiliary cooler input is to control with the contact point signal of pasta temperature controller, winding temperature controller or current relay.Because the finiteness of component contacts, a therefore general control with auxiliary cooler is divided into opens/stops two states.When 2. the cooler grouping drops into or excises, can cause the control system fault, even can cause the unnecessary tripping operation of transformer.Also can produce bigger starting current simultaneously, produce bigger shoving in transformer oil, sometimes even can cause the Buchholz relay misoperation of transformer and cause the unnecessary tripping operation of transformer, particularly when the cooler frequent switching, situation can be worse.In addition, asymmetric the opening of cooler/stop also can cause bigger oily stream to spring up, and this can make the Buchholz relay misoperation of transformer equally; 3. operate in the cooling device input of " assisting " and " standby " position and out of service, will cause the local difference of temperature in the transformer.In order to guarantee the even of temperature of oil in transformer, the solution of taking the at present cooler of normally will working places the symmetric position of transformer, but when auxiliary cooler and standby cooler start, can cause new inhomogeneously again, can produce local oily temperature abnormality situation inevitably for non-guidance type transformer cooling system; 4. cooler by auxiliary, work, standby grouping after, each is organized running time can occur serious unbalanced phenomenon.Because the difference of their functions, the running time of cooler that is in each position is also inequality, and length ordering running time is followed successively by the cooler of the work of being in, auxiliary, stand-by state.In order to improve this situation, at set intervals the operating state of each cooler is carried out manual switch.So just can't satisfy unattended requirement; 5. cooler power consumption when moving is higher, and the running noises of cooler is also big and very difficult further reduction again.With the modal cooler configuration 250kWX4 of transformer group is example, and the temperature rise requirement generally is made as operating state with two groups of coolers when guaranteeing operate as normal, one group auxiliary, one group standby.Under the normal condition, because cooler is a stepped starting, so the efficient of cooler is always rich, thereby particularly when load or ambient temperature step-down cause temperature of oil in transformer to reduce, these two groups of coolers not only have the negative effect that causes oil temperature low excessively, thereby have increased unnecessary power consumption and noise.6. running up of cooler oil pump can cause increasing the weight of of oil stream electrostatic phenomenon.In the large-scale power transformer of forced oil-circulation, because transformer oil when flowing through insulating paper and insulating board surperficial, oil stream static electrification phenomenon (oil flow electrification) can take place, it is the key factor that threatens superelevation transformer security of operation.

Summary of the invention

The utility model is for the defective that the control mode that solves existing transformer cooler exists, and XBKP-PB that a kind of PLC of employing controller combines with frequency converter (gilled radiator with) and XBKF-PB (strong oily recirculation cooler usefulness) novel intelligent transformer cooler control system are provided.

For reaching above purpose, the utility model takes following technical scheme to be achieved:

A kind of intelligence controlling device of transformer cooler, comprise that one is located at the host computer in the control room, a programmable logic controller (PLC) of being located in the control cubicle, be integrated with host module CPU, analog quantity input module and analog output module, switching input module and switching value output module in this programmable logic controller (PLC), described programmable logic controller (PLC) is connected with the host computer two-way signaling by the communication interface on the host module CPU, it is characterized in that described analog quantity input module receives the oily thermometric input signal from transformer oil surface temperature controller; Described switching input module receives the run signal from transformer cooler; Described switching value output module is by the actuator output control signal of a frequency converter to transformer cooler; Described analog output module is by the actuator output running frequency conditioning signal of this frequency converter to transformer cooler.

In the such scheme, when the actuator of transformer cooler adopts oil pump and blower fan; Its oil pump and blower fan respectively dispose a special converter.

Compared with prior art, intelligence control system of the present utility model has following superiority:

1. cooler control has realized Based Intelligent Control, adapts to automatically, follows automatically and stepless speed regulation; Impulse current and oily stream have sprung up, have guaranteed the normal operation of transformer when 2. smoothly having started, having eliminated startup; 3. increase cooler service life, reduced maintenance cost; 4. improve the unbalanced situation of temperature of oil in transformer, reduced the possibility of oily stream electrostatic accident; 5. energy-conserving action is obvious; 6. reduce noise; 7. the expansion of controlled function after helping.

Description of drawings

Fig. 1 is the utility model control system functional block diagram.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

Transformer cooling intelligence control system as shown in Figure 1 comprises control room, control cubicle and controlled transformer.Wherein use the control section of programmable logic controller (PLC) 1 (PLC) in the control cubicle as transformer cooling device.PLC has also disposed the RS485 interface 7 that the upper machine communication in analog quantity input module 3, analog output module 4, switching input module 5, switching value output module 6 and corresponding and the control room is used except that host module 2 (CPU).The 3 main inputs of analog quantity input module are from the 4mA-20mA temperature signal of transformer oil surface temperature controller; Switching input module 5 input is from the run signal of transformer cooler, and the amount of main run signal is: the secondary contact of the switch of the auxiliary contact of two-way main power source contactor, selector switch contact, each oil pump, blower fan, reflect the frequency converter working condition signal of each fan operation state; Switching value output module 6 is by the output equipment of frequency converter 8 output each oil pump of control and fan switch; Analog output module 4 is given frequency converter 8 output frequency conditioning signals.Because the oil pump of transformer cooler and the control logic of blower fan are inconsistent, can adopt blower fan, oil pump special converter to make the speed change final controlling element.So the oil pump of every group of cooler and blower fan have disposed a frequency converter.

According to the operation conditions of transformer and cooling device, in time the output frequency of frequency converter is adjusted by PLC.In the transformer running, when transformer load reduction/rising, because transformer loss also will decrease/raise, therefore the thermal power that loss produces also will reduce/increase, the variation of transformer temperature rise can feed back to PLC with this temperature signal by analog quantity input module 3 by the pasta temperature controller that is installed on the transformer, after the CPU of PLC handles; Export to frequency converter 8 frequency adjustment signals by analog output module 4, thereby reduction/rising is installed in the oil pump motor on the cooler and the rotating speed of fan motor, turning down/cooling capacity of rising cooler, thereby make transformer maintain stable operation in certain limit of temperature rise.But be noted that its upper limiting frequency can not be higher than the nominal operation frequency of blower fan or oil pump when frequency converter 8 output frequencies raise; When the frequency converter output frequency reduces, can operate as normal and take into account efficient for the requirement that guarantees the minimum lift of oil pump, pressure or flow and oil flow relay, frequency can not be fallen lowly excessively.

When certain table oil pump or fan in service broke down stoppage in transit, PLC increased all the other frequency converter output frequencies, to keep whole cooler power constant, recovered normal operation until fault oil pump or blower fan.

Claims

1, a kind of intelligence controlling device of transformer cooler, comprise that one is located at the host computer in the control room, a programmable logic controller (PLC) of being located in the control cubicle, be integrated with host module CPU, analog quantity input module and analog output module, switching input module and switching value output module in this programmable logic controller (PLC), described programmable logic controller (PLC) is connected with the host computer two-way signaling by the communication interface on the host module CPU, it is characterized in that described analog quantity input module receives the oily thermometric input signal from transformer oil surface temperature controller; Described switching input module receives the run signal from transformer cooler; Described switching value output module is by the actuator output control signal of a frequency converter to transformer cooler; Described analog output module is by the actuator output running frequency conditioning signal of this frequency converter to transformer cooler.

2, the intelligence controlling device of transformer cooler as claimed in claim 1 is characterized in that, when the actuator of transformer cooler adopts oil pump and blower fan simultaneously; Its oil pump and blower fan respectively dispose a special converter.