SU650152A2 - Device for hold time of generator permissible load - Google Patents

Description

one

The invention relates to the field of excitation control of high-power synchronous generators, for their reliable operation, it is necessary to control the permissible degree of overheating of the rotor windings (stator).

Basically auth. St. No. 517106 describes a device for delaying the permissible overload of the generator, comprising a functional addition converter, which includes a unit comparing rotor and stator currents with a reference value, an addition and subtracting pulse generator with integrators at the input connected through the elements of the reverse pulse counter, the output which is connected to the excitation controller via a switching element, a functional subtraction converter, the output of which is connected to the specified impulse generator cos vychitapi and the input to the outputs of all bits of said reversible pulse counter.

The known device makes it possible to measure generator overload or only in the inductive plug in the capacitive quadrant of the generator, i.e., it does not have a wide variety of options to use this device to measure overload in both quadrants of the generator.

The aim of the invention is to extend the functionality of the device, increasing accuracy and reliability.

To achieve the specified goal in the device by author. St. No. 517106 additionally introduced a functional transducer of pulse-capacitive quadrant addition, the OR element and two elements coincidently add, add, and the output of the functional pulse-converting pulse generator and two inputs of the OR element are connected to the functional pulse-converting converter, the output of the functional pulse converter of the pulses of the capacitor quadrant and its output of the pulses of the pulses of the capacitor quadrant; is also connected to the input of the match element “add, and the output of the element OR is connected to the input of the element subtract the second input of which is connected to the second input of the coincidence "iribavit and through the switching element in a yield of up-down counter, and the outputs of matching elements" subtract, and "add regulator connected to the drive.

On fpg. 1 shows the scheme of the proposed device; in fig. 2 shows a functional transducer diagram.

addition of pulses of the capacitive quadrant; in fig. 2a - dependence Utsykh - f () Functional transducer for the 1 addition of pulses of a capacitive quadrant, to the input of which a voltage is proportional to the magnitude of the overload in the capacitive quadrant, its output is connected via a separating diode to the input of the functional impulse generator 2 for the impulses. Element 3 match is added to the output of the reversible counter 4 through the switching element 5 and match element 6 to reduce, another input of which is connected to the output of the element OR 7.

The elements of the match "add," decrease are self-holding and their outputs are connected to an automatic excitation controller. The inputs of the element OR 7 through their comparing reference values included a voltage proportional to the rotor current and the stator current.

Functional transducer 1 of the addition of the pulses of the capacitive quadrant consists of two operational amplifiers 8,

9, having nonlinear input circuits 10, AND, which allow approximating the input voltage with sufficient accuracy to operate it with a known device for holding the generator overload time and line inputs 12, 13. For example, the relationship (P, Q) is set as shown in FIG. 2a Enough approximation accuracy is obtained by approximating four linear sections. The slope of the first section is selected from the linear input 12, the slope of the second section and its conjugation with the first is determined by the non-linear input

10. The tilts of the third and fourth sections are determined in a manner similar to that described using the operational amplifier 9.

The operation of the device is as follows.

A voltage transducer is applied to the functional transducer of the pulse-multiplying circuit of the capacitive quadrant, which is proportional to the generator overload in the capacitive quadrant. When the voltage exceeds the reference value, the input of the converter 2 supplies the voltage from the output of the converter 1 and the device for delaying the time for the generator overload starts counting the permissible time for the overload in the capacitive quadrant. When the permissible overload time is reached at the output of the reversible counter 4, a voltage appears that is applied to one of the inputs of the coincidence element 3. To another input of this item

The power supply is supplied to the generator overload in the capacitive quadrant.

At the time of the occurrence of the nanowire at the output of the counter 4, the switching element 5 closes, element 3 is triggered and the signal "add goes to the automatic excitation regulator, as a result of which the generator overload decreases to

permissible values in the capacitive quadrant. After the element 3 is triggered and the generator returns to the mode of long-term permissible operation, the generator cools down time.

If, however, overheating occurs in the inductive quadrant, then the device for measuring the time delay of the permissible overload begins by counting the permissible overload time in the inductive quadrant.

When the permissible overload time is reached, a voltage appears at the output of the meter 4, the switching element 5 closes and the voltage is applied to one of the inputs of the coincidence element 3. On

the other input of this element through the element OR 7 is supplied with a voltage proportional to the generator overload in the inductive quadrant. At the time of the occurrence of the voltage at the output of the counter 4, element 3 is triggered and the signal "reduce goes to the automatic excitation regulator, as a result of which the generator overload decreases to the permissible value in the inductive quadrant. After element 3 is triggered and the asynchronous generator returns to the nominal mode, the generator cooling time is counted.

Claims (1)

Invention Formula Device for delaying the permissible generator overload according to the author. St. No. 517106, characterized in that, with In order to expand functionality, improve accuracy and reliability, it is additionally equipped with a functional capacitive quadrant pulse addition transducer, an OR element and two matching elements "decrease," add, and the output of the capacitive quadrant functional pulse converter and two inputs of an OR element are connected to the functional converting converter pulses, the output of the functional converter of the addition of pulses of a capacitive quadrant is also connected to the input element NTA coincidence "added, and the output the OR element is connected to the input of the joint element “to subtract, the second input is 5b It is connected to the second input of the element of the naive counter, where the outputs of the elements of the match add, and also through the match to reduce, add the contact element with the output reversed with the excitation regulator. 650152 SCH; () „NpuSalurt fyfsft / mi