JPH04264278A - Supporting device for operation of generator - Google Patents

Abstract

PURPOSE:To obtain a supporting device of operation of a generator by providing an arithmetic device which computes the temperature of a field winding on the basis of a temperature corresponding to a measured field current of an exciter, the temperature of a cooling medium for the generator and a temperature due to a mechanical loss, and by displaying the result of computation in a display unit. CONSTITUTION:During the operation of a generator 1, a field current of an exciter 4 is measured by a measuring device 6. Meanwhile, the temperature of a cooling medium of the generator 1 is measured by a measuring device 7, and values of them are inputted to an arithmetic device 8 respectively. Using a temperature rise T determined according to the field current, the temperature TCG2 of the cooling medium and a temperature rise TCGI due to a mechanical loss of the generator as input values, the arithmetic device 8 computes the temperature Tf of a field winding by an equation Tf= T+TCG1+TCG2 and the result of the computation is displayed in a display unit 9. The temperature rise T is determined by an equation T=K(If)<2>. K denotes a constant and If the field current of the exciter 4. When the temperature Tf of the field winding exceeds a prescribed value set beforehand, besides, a signal is outputted to an alarm unit.

Description

[0001] The present invention relates to a generator operation support device used to continuously monitor the field winding temperature of a brushless excitation type generator. It is. [0002] FIGS. 2 and 3 are diagrams showing the characteristics of the generator output current versus the generator field current and the generator field current versus the generator, which are conventionally used to measure the field winding temperature. 1 is a field winding temperature characteristic diagram, in which ΔT is a temperature increase due to field current, and TCG1 is a temperature increase due to mechanical loss of the generator. Next, the operation will be explained. First, the operator reads the output current and power factor of the generator from the monitoring board, and from these readings uses FIG. 2 to read the field current of the generator. Next, from the field current of the generator thus read, the value of increase in the temperature of the field winding of the generator is read using FIG. Then, the separately measured temperature of the cooling medium of the generator is added to the increase value of the field winding temperature of the generator, and the result is defined as the field winding temperature of the generator. [0004] Problems to be Solved by the Invention [0004] Conventional field winding temperature measurements are carried out as described above, so that operators can check each time the temperature changes due to field current and generator mechanical loss. , it is necessary to calculate the field winding temperature, which makes continuous temperature monitoring impossible, and there are problems such as the inability to display alarms even if the field winding temperature exceeds a specified value. there were. [0005] This invention was made to solve the above-mentioned problems, and it is possible to automatically calculate the field winding temperature and display it continuously. It is an object of the present invention to provide a generator operation support device capable of notifying an operator by generating an alarm if necessary if a value exceeds the value. Means for Solving the Problems [0006] A generator operation support device according to the present invention includes a temperature corresponding to a measured field current of an exciter, a measured temperature of a cooling medium for the generator, and a generator operation support device. A calculation device is provided to calculate the field winding temperature based on the temperature due to mechanical loss, and the result of this calculation is displayed on a display. [Operation] The calculation device according to the present invention automatically calculates the field winding temperature based on the temperature data corresponding to the field current of the exciter, the temperature of the cooling medium, and the mechanical loss of the generator. , it is possible to display the continuously changing field winding temperature on a display without bothering the operator, making it easy to monitor the temperature, and also to ensure that the field winding temperature does not exceed the specified value. If the limit is exceeded, it will be possible to issue a warning with sound or light as necessary. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a generator, 2 is a field winding of the generator 1, 3 is a rectifier that rectifies the AC output of the exciter into DC,
4 is an exciter that supplies field current to the generator 1; 5 is a field winding of the exciter 4; 6 is an exciter field current measuring device that measures the current flowing through the field winding 5; 7 is a power generator A cooling medium temperature measuring device 8 measures the temperature of the medium that cools the machine 1, and 8 indicates the exciter field current measured by the exciter field current measuring device 6 and the cooling medium measured by the cooling medium temperature measuring device 7. 9 is a display device that displays the field winding temperature calculated by the calculation device 8; Next, the operation will be explained. First, while the generator 1 is operating, the field current of the exciter 4 is measured by the exciter field current measuring device 6. On the other hand, the temperature of the cooling medium of the generator 1 is measured by the cooling medium temperature measuring device 7, and each is input to the calculation device 8. The calculation device 8 calculates the temperature rise ΔT determined corresponding to the field current, the temperature TCG2 of the cooling medium, and the temperature rise TC due to the mechanical loss of the generator.
Using G1 as an input value, the generator 1 is
The field winding temperature Tf is calculated and the result is displayed on the display 9. [Equation 1] Note that in Equation 1, the rising temperature ΔT is expressed as Equation 2.
In this case, K is a constant and If is the field current of the exciter 4. ##EQU00002## Further, the arithmetic unit 8 detects that the field winding temperature Tf, which is the result of the arithmetic operation, exceeds a predetermined value, and according to this detection result, an alarm (not shown) is issued. It is also possible to output a signal to the device and generate an alarm with sound or light. Although the above embodiment shows that the arithmetic unit 8 and the display 9 are provided separately, they may be integrated including the alarm means, and the same effect as in the above embodiment can be obtained. [0015] As described above, according to the present invention, the temperature corresponding to the measured field current of the exciter, the measured temperature of the cooling medium for the generator, and the temperature due to the mechanical loss of the generator can be adjusted. We originally installed a calculation device to calculate the field winding temperature and configured the display to display the results of this calculation, so that the field winding temperature can be continuously changed without the operator's intervention. can be monitored using a display, and if the field winding temperature exceeds a specified value, a sound or light alarm can be used as necessary, which can contribute to improving the reliability of operation management. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a generator operation support device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of generator output current versus generator field current used to measure field winding temperature in the related art.

FIG. 3 is a graph of generator field current versus field winding temperature characteristics used to measure field winding temperature in the related art.

[Explanation of symbols]

1 Generator 4 Exciter 6 Exciter field current measuring device 7 Cooling medium temperature measuring device 8 Arithmetic device 9 Display

Claims (1)

[Claims] 1. An exciter field current measuring device for measuring the field current of an exciter for a generator, a cooling medium temperature measuring device for measuring the temperature of a cooling medium for the generator, and a cooling medium temperature measuring device for measuring the temperature of a cooling medium for the generator, and the field a calculation device that calculates a field winding temperature based on the temperature corresponding to the magnetic current, the temperature of the coolant measured above, and the temperature due to mechanical loss of the generator; and a display device that displays the calculation results of the calculation device. Equipped with generator operation support equipment.