SU1285411A1 - Device for checking generators - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invented shadow is to expand the functionality of the device. The device contains sensors 1 and .2 of excitation current, sensor 3 of the current voltage, sensor 4 of the reference voltage, comparators 6-I, elements AND 12-17, elements OR 18 and 19 and time relay 20-22. The introduction of a time relay 23, an indicator 24, and the formation of new functional connections allow the type of defect to be recognized by the partially working generators from the system itself or the voltage regulator. 1 il. i (L

Description

INO 00 OL

112

The invention relates to instrumentation technology and can be used to monitor and diagnose faults in parallel generators,

The purpose of the invention is to expand the functional capabilities of the device, including the ability to recognize the type of defect in parallel with the operating generators: the failure of the generator itself of the voltage regulator itself.

The drawing shows a block diagram of the device

The device contains the first 1 and second 2 sensors of the excitation current, the sensor 3 of the current voltage, the sensor 4 of the reference voltage, the sensor 5 of the unbalance of the reactive current, the first through the sixth comparators 6-11, the first through the sixth elements And 12-17, the first the second elements OR 18 and 19, from the first to the fourth time relays 20-23 and indicator 24,

The output of the first excitation current sensor 1 is connected respectively to the first inputs of the first and second comparators 6 and 7, the output of the second excitation current sensor 2 is connected to the second inputs of the first and second comparators 6 and 7, respectively. The output of the current voltage sensor 3 is connected to the first inputs of the first and the sixth comparators 10 and 11, the second inputs of the fifth and sixth comparators 10 and 11 are connected to the second output of the sensor 4 of the reference voltage. The first output of the sensor 4 reference voltage is connected to the first inputs of the third and fourth comparators 8 and 9, and the second inputs of the third and fourth comparators 8 and 9 are connected to the output of the sensor 5 unbalance reactive current

The output of the first comparator 6 is connected to the first input of the first element And 12, the second input of the fourth element And 15, the first input of the fifth element And 16, The output of the second comparator 7 is connected to the first input of the second element And 13, the second input of the third element And 14, the first input of the sixth element And 17, the output of the fifth comparator 10 is connected to the first input of the third element And 14 and the third input of the fifth element And 1 The output of the sixth para1 parator 11 is connected to the first input of the fourth element

AND 2

And 15 and the third input of the sixth element And 17, The output of the third comparator 8 is connected to the second inputs of the first element And 12, the third input of the third element And 14, the second input of the sixth element And 17, The output of the fourth comparator 9 is connected to the second input of the second element And 13 , the third input of the fourth element And 15 and the second input of the fifth element And 16,

The output of the first element And 12 through the third time relay 22 is connected to the first input of the indicator 24, Output. The second element And 13 is connected through the fourth relay 23 time with the second input of the indicator 24, The outputs of the third and fourth elements And 14 and 15 are connected to the corresponding inputs of the first element OR 18 whose output through the first relay 20 of the time is connected to the third input of the indicator 24 ,, the sixth elements And 16 and 17 are connected to the corresponding inputs of the second element OR 19, the output of which through the second time relay 21 is connected to the fourth input of the indicator 24.

The device works as follows.

The principle of operation of the device is based on comparing the excitation currents and reactive currents, as well as the current voltage of the tires with the nominal voltage of the reference voltage sensor and using the received signals to determine the faulty generator set.

The device allows detecting four different states of two generators operating in parallel: the malfunction of the first generator, the malfunction of the second generator, the malfunction of the first voltage regulator, the malfunction of the second voltage regulator,

A malfunction of a generator operating on a common network with another generator is characterized by an increased excitation current and a reduced reactive current value in comparison with the excitation current and the reactive current of a working generator,

If the excitation current of the first generator (excitation current sensor 1) is greater than the excitation current of the second generator, then from the first comparator 6, the first input of which receives a signal from the current sensor I

excitation, and the second input from the sensor 2 of the excitation current, to the first input of the first element And 12 receives a signal of a logical unit. If the reactive current of the first generator is less than the reactive current of the second generator, then from the third comparator 8 to the second input of the first element I 12 also receives a logical, one signal. At the same time, from the output of this element, the signal of the logical unit through the time relay 22 is fed to the first input of the indicator 24, and through the delay time of the relay 22, the fault signal of the first generator is indicated.

For a faulty second generator, a similar signal is formed at the output of element I 13 and is fed through time relay 23 to the second input of indicator 24 to indicate the malfunction of the second generator.

The malfunction of the voltage regulator of one of the parallel operating generators is characterized either by a reduced value of the excitation current and, as a consequence, by a reduced value of the reactive current compared to a correctable generator, or by increased values of the excitation current and reactive current. For two generators operating in parallel in this case, there is characterized by a smaller (increasing) excitation current and a reactive current of one generator and simultaneous. an increase (decrease) in the excitation current and the reactive current of the second generator. Therefore, to distinguish the malfunction of the voltage regulator of each of the parallel operating generators, the voltage signal of the generator buses from the current voltage sensor 3 is additionally analyzed.

So, if a malfunction of the first voltage regulator leads to an increase in the excitation current and, consequently, a positive unbalance of the reactive current of the first generator, the outputs of the comparators 6 and 9 to the second and third inputs of the element 15 receive logical signals I voltage regulator, will increase the voltage on the tires of parallel generators, and this corresponds to the output signal of the logic I of the comparator I1, whichG arrives at the first input element And 15. At the same time, the output Element G1 18 generates a signal from Logic 1, which, through time relay 21, ensures the elimination of spurious signals of malfunction, for example, due to transients in the system, arrives at the third input of indicator 24.

When the excitation current decreases and, consequently, the negative unbalance ratio of the reactive current of the first generator due to the malfunction of the first voltage regulator, the logical signals are generated at the outputs of the comparators 7 and 8 and are fed to the second and third inputs of the element 14, the generator unloading a faulty voltage regulator will lead to a decrease in the voltage on the tires of parallel-running generators, and this corresponds to the output signal of logic 1 at the output of the comparator 10, which is fed to the second input of the element 14, When, at the output of this OR gate 18 is formed by a logic 1 signal coming via a relay 20 for a third time indicator input 24,

With an increase in the excitation current and, therefore, a positive unbalance value of the reactive current of the second generator due to a faulty voltage regulator (this corresponds to a decrease in the excitation current and a negative unbalance value of the reactive current of the first generator), the logical 1 generated at the output of the comparators 7 and 8 simultaneously arrive at the first and second inputs of the element And 17, the third input of this element receives a logical signal 1 about the increased voltage value from the output of the comparator 11, since the overload g with a faulty generator of voltage regulator increases the voltage at its tires. At the same time, at the output of the element OR 19, a signal of logical 1 is formed.

If the second voltage regulator fails, which leads to a decrease in the excitation current and a negative value. reactive current unbalance of the second generator (which corresponds to an increase in the excitation current and a positive unbalance of the reactive current of the first

t), the lotto 1s formed at the outputs of comparators 6 and 9 simultaneously access the first and second inputs of the fifth element 16. The third input of this element receives a logical signal about the reduced voltage value from the comparator 10 output, since unloading the generator with a faulty voltage regulator reduces the voltage on the tires. At the same time, at the output of the element OR 19, a signal of logical 1 is formed, which, after кkle 21 of time, ensuring the elimination of spurious signals of faults, goes to the fourth input of indicator 24

As an indicator, for example, a light panel can be used, consisting of a set of relays whose contacts close the power supply circuits of signal lamps, if there is a signal to the relay, indicating indications of incorrect readings, for example, Faulty generator 1, Faulty voltage regulator number 1, etc.

Claims (1)

Invention Formula A device for monitoring generators, comprising a first field current sensor, the output of which is connected to the first inputs of the first and second comparators, the outputs of which are connected to the first inputs of the first and second elements And, respectively, the second inputs of which are connected to the outputs of the third and fourth coders respectively, the first inputs of which are connected to the first output of the voltage sensor, the third, fourth elements AND the outputs of which are connected to the inputs of the first OR element, the output of which is connected to the first p barely time, fifth and sixth elements And, outputs to 8S / 4l I6 toryh Soedi (M) s. Entrants of the second e: gement OR,. The B1.1 hole of which is connected to the HTOpoi output of the tfemenia relay, the second excitation current sensor, the sensor With TKKymei o, for example, 1, a third time relay, characterized in that, in order to expand the functionality involved in the recognition capability 0 kind of defect generators into it reactive current unbalance sensor, a fourth time relay and an indicator are introduced, the output of the second excitation current sensor is connected to the second inputs of the first and second comparators, the output of the current voltage sensor is connected to the first inputs of the fifth and sixth comparators, the second inputs of which are connected to the second output 20 the sensor stroke of the reference voltage, and the outputs are connected respectively to the first input of the third element And and the first input of the fourth element And, the second inputs of which are connected respectively to the outputs of the second and the first- comparators third inputs of third and fourth AND gates respectively connected to the outputs of the third and fourth comparators, 30, the first inputs of the fifth and sixth elements I are connected respectively to the outputs of the first and second comparators, the second inputs are connected respectively to the outputs of the fourth and 35 of the third comparators, and the third outputs are connected to the outputs of the fifth and sixth comparator, respectively, the outputs of the first and second elements I are connected respectively via the third and fourth time relays to the first and second inputs of the indicator, the outputs of the first and second time relays are connected respectively to the third and The fourth inputs of the indicator, the output of the unbalance sensor of reactive currents are connected to the second inputs of the third and fourth comparators.