JPS644658B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an operating device for a transformer cooler, and in particular reduces excessive auxiliary equipment input of the transformer cooler and loss generated in the transformer, thereby enabling energy saving. The present invention also relates to an operating device for a transformer cooler that can prevent wear and tear on bearings of auxiliary equipment.

[Background of the invention]

Generally, the power generated by a generator is supplied to the power system via a transformer, and the capacity of the generator tends to increase due to the increase in demand for electricity and other reasons, and accordingly, the capacity of the generator tends to increase. The vessels are also larger. The transformer is forcedly cooled to ensure sufficient cooling, but conventionally,
There was a tendency to waste power by cooling more than necessary. This will be explained with reference to FIG.

FIG. 1 is a block diagram showing a conventional operating device for a transformer cooler. In FIG. 1, the operating device includes a transformer 1 for supplying power generated by the generator to the power grid, and a transformer 1
a load factor detection device 2 that detects the load state of the transformer 1; a temperature detection device 3 that detects the operating temperature of the transformer 1;
It is comprised of a cooler control cubicle 6 that controls a cooler group for cooling the transformer 1, and a cooler group 7 that cools the transformer 1.

The details of the above components will be explained below.

In the above configuration, the cooler control cubicle 6 operates in conjunction with the load factor detection device 2 to detect the transformer 1.
current relays 9 and 10 for detecting the load factor; a wiring logic device 11 for outputting a signal for controlling the cooler group 7 based on output signals from the load factor detection device 2 and the temperature detection device 3; An excitation coil 12 is excited by a signal from the wiring logic device 11, and the power supply for the cooling group 7 is activated in conjunction with the excitation coil 12.
It consists of electromagnetic switches 13 and 14 that turn on and off, and disconnectors 15 and 16 that connect the electromagnetic switches 13 and 14 to the power supply system.

The cooler group 7 is composed of auxiliary equipment 8 for cooling the transformer 1.

In the configuration shown in FIG. 1, the operating state of the transformer 1 is determined by the load factor detection device 2 and the temperature detection device 3.
By inputting the output signals of the load factor detection device 2 and the temperature detection device 3 to the wiring logic device 11, a signal corresponding to the operating state of the transformer 1 is outputted. The cooling capacity of the cooler group 7 is controlled by changing the number of auxiliary machines 8 in the cooler group 7 in operation via electromagnetic switches 13 and 14.

Therefore, the cooling capacity of the transformer 1 is controlled in a stepped manner in a state that always exceeds the required cooling capacity, and since the control of the cooler group 7 is rough, the cooling capacity of the transformer 1 is The cooling capacity was often excessive, resulting in uneconomical operation.

Additionally, the auxiliary equipment 8 may start up or down due to fluctuations in the load factor.
Stops were controlled and had disadvantages such as being susceptible to mechanical wear, especially in bearings.

[Purpose of the invention]

It is an object of the present invention to eliminate the drawbacks of the prior art, reduce excessive auxiliary equipment input to the cooler group and loss generated by the transformer, enable energy saving, and reduce wear and tear on the bearings of the auxiliary equipment. An object of the present invention is to provide an operating device for a transformer cooler that can prevent the above problems.

[Summary of the invention]

In order to achieve the above object, the present invention includes an input device that detects at least one of the temperature and load of the transformer and outputs the signal, and controls the operation of the motors of the cooler group connected to the transformer. A control command device that is configured to control the transformer, stores temperature and load patterns based on the operating results of the transformer, and outputs signals of air blowing amount and oil feeding amount that are adapted to the temperature and load pattern. and a data processing device that is controlled based on the output signal of the control command device, and further outputs an appropriate signal by comparing and determining the output signal of the input device and correcting it when the control pattern differs from a stored control pattern. , and a speed control device that controls the operating speed of the motor of the cooler group based on the output signal of the data processing device.

[Embodiments of the invention]

Next, the present invention will be explained in detail with reference to the drawings. In the embodiment of the present invention, parts that are the same as those in the prior art are designated by the same reference numerals, and explanations of the same parts will be omitted and will be explained with reference to FIG.

FIG. 2 is a block diagram showing an operating device for a transformer cooler according to the present invention. In FIG. 2, the operating device includes the transformer 1 and the load factor detection device 2.
, the temperature detection device 3, and a winding temperature or oil temperature detection device 4 for detecting the operating temperature of the transformer 1.
, an ambient temperature detection device 5 that detects the ambient temperature of the transformer 1, and a cooler control cubicle 6A that outputs appropriate control commands for controlling a group of coolers for cooling the transformer 1. The cooler group 7;
A speed control cubicle 30 controls the operating speed of a group of coolers for cooling the transformer 1 based on the output from the cooler control cubicle 6A.

The details of the above configuration will be explained above.

In the above configuration, the cooler control cubicle 6A converts signals from the load factor detection device 2, the temperature detection device 3, the winding temperature or oil temperature detection device 4, and the ambient temperature detection device 5 into electrical signals. converters 17, 18, 19, and 20, an analog input device 21 that converts the signals from the converters 17, 18, 19, and 20 into analog signals, and temperature and load information obtained from the operating history of the transformer 1. The auxiliary equipment 8 is calculated in advance in accordance with the patterned data, the temperature and the load pattern, and the sum of the loss of the auxiliary equipment 8 and the loss generated by the transformer 1 is minimized. A control command device 22 that also contains speed control data of and outputs control commands for the auxiliary equipment 8 based on this speed control data, and for operating conditions such as the load factor and ambient temperature of the transformer 1, a data processing device 23 that contains pre-calculated data of permissible temperature difference for comparison and compares and determines the output signal from the control command device 22 and the output signal from the analog input device 21 with the built-in data; It is comprised of a storage device 24 that stores data from the data processing device 23, and an analog output device 25 that converts the output from the data processing device 23 into an analog signal.

The speed control cubicle 30 includes electromagnetic switches 26 and 28 that turn on and off the power of the auxiliary equipment 8.
and a speed control device 2 that controls the operating speed of the auxiliary machine 8 based on the output signal from the analog output device 25.
7, and a disconnector 29 that connects the auxiliary equipment 8 to the power supply system.
It is composed of.

In the configuration shown in FIG. 2, the detected values of the load factor detection device 2, the temperature detection device 3, the winding temperature or oil temperature detection device 4, and the ambient temperature detection device 5 are the same as those of the converters 17 to 20 and The data is input to the data processing device 23 via the analog input device 21.

On the other hand, in the control command device 22, along with temperature and load patterned data obtained from the operation history of the transformer 1, the loss of the auxiliary equipment 8 and the data of the transformer 1 are processed in accordance with the temperature and load pattern. The built-in speed control data of the auxiliary machine 8 is calculated and obtained in advance so that the sum of the generated losses is minimized, and the control command for the auxiliary machine 8 is set based on the speed control data. It is input to the processing device 23.

Therefore, the data processing device 23 converts the transformer 1
For operating conditions such as load factor and ambient temperature,
The data of the allowable temperature difference calculated in advance for comparison is built in, and the output signal from the control command device 22 and the output signal from the analog input device 21 are compared with the built-in data to determine the load factor of the transformer 1 or If the ambient temperature is within the range of the control pattern, the auxiliary machine 8 can be controlled by the output signal of the control command device 22 via the analog output device 25 and the speed control device 27. However, if the load factor or ambient temperature of the transformer 1 is outside the range of the control pattern, the output signal from the analog input device 21 is compared and corrected by the data processing device 23 to determine the appropriate value. It is configured to output a control command to control the auxiliary machine 8 via the analog output device 25 and the speed control device 27.

FIG. 3 is a curve diagram of the required auxiliary power when controlling the speed with respect to the load factor of the device shown in FIG. In FIG. 3, the patterned speed control of the auxiliary equipment 8 by the control command device 22 results in the following curve C.
Corresponding to the load factor of the transformer 1, it is possible to save auxiliary power by 20 to 30% compared to the conventional method.
loss can also be significantly reduced.

Note that the stepwise curve A is the required auxiliary power in the conventional control method, and the curve B is the ideal curve for the required auxiliary power in the conventional control method. Therefore, the portion shown by solid lines and dotted diagonal lines is the auxiliary power saved by the present invention.

〔Effect of the invention〕

As can be easily understood from the foregoing, the present invention can significantly reduce the auxiliary equipment input to the cooler group, thereby saving energy, as well as reducing the number of times the auxiliary equipment is started and stopped for cooling capacity control. It is also possible to reduce the impact force acting on the bearings of the auxiliary equipment, thereby extending the life of the auxiliary equipment and improving maintainability and reliability.

Another advantage is that when the speed of the auxiliary equipment is reduced, the noise is significantly reduced, especially when the load on the transformer is low, such as at night.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the operating device of a conventional transformer cooler, Fig. 2 is a block diagram showing the operating device of the transformer cooler of the present invention, and Fig. 3 shows the load factor of the device in Fig. 2. It is a curve diagram of required auxiliary machine electric power at the time of speed control. 1...Transformer, 2...Load factor detection device, 3...
Temperature detection device, 4...Winding temperature or oil temperature detection device, 5...Ambient temperature detection device, 6A...Cooler control cubicle, 7...Cooler group, 8...Auxiliary equipment, 17-20... Converter, 21... Analog input device, 22... Control command device, 23... Data processing device, 24... Storage device, 25... Analog output device, 26, 28... Electromagnetic switch, 27...
... Speed control device, 29 ... Disconnector, 30 ... Speed control cubicle.

Claims (1)

[Scope of Claims] 1. A device comprising a detection device for detecting at least one of the temperature and load of a transformer and configured to control the operation of a motor of a group of coolers connected to the transformer, wherein the detection device An input device that takes in the data obtained by the device, a temperature and load pattern based on the operating history of the transformer are stored, and signals of the air flow rate and oil flow rate adapted to the temperature and load pattern are output. A control command device, and data that is controlled based on an output signal of the control command device, and further outputs an appropriate signal by comparing and determining the output signal of the input device and correcting it when the control pattern differs from a stored control pattern. 1. An operating device for a transformer cooler, comprising: a processing device; and a speed control device that controls the operating speed of a motor of the cooler group based on an output signal of the data processing device. 2. In the operating device for a transformer cooler according to claim 1, the control command device determines the generated loss of the transformer and the loss of auxiliary equipment based on the temperature of the transformer and the operating history of the load. An operating device for a transformer cooler, characterized in that it is equipped with a speed control program for auxiliary equipment calculated in advance so as to minimize the speed of the auxiliary equipment. 3. In the operating device for a transformer cooler according to claim 1, the data processing device is provided with basic data for comparison of allowable operating temperatures of the transformer corresponding to ambient temperature and load factor, 1. An operating device for a transformer cooler, comprising a function of compensating the speed control of an auxiliary device based on temperature and load pattern storage in a command device using an output signal from the input device.