SU395788A1 - PATENSH-TESH "1! NEA LIBRARY - Google Patents

Description

one

The known devices for monitoring the rotor's stick out angle, which contain a measuring trigger with a measuring device at the output and two input channels — by the generator voltage and by a pulse from the induction rotor position sensor, do not provide high accuracy and reliability.

The purpose of the invention is to perform a setpoint-controlled fixing of the moment when the rotor generates the control angles, improving measurement accuracy and reliability of operation.

This is achieved by the fact that the task body contains a comparison trigger with a relay, controlled by pulses with the phase of the generator voltage directly and pulses with the phase of the emf. a generator through a delayed element with an adjustable duration to create a voltage jump on the actuator when the specified angle is reached.

In order to increase the accuracy of work, inhibited control-generator generators are included in the input channels of the device control.

To increase the reliability of operation, power can be supplied to the device from generator voltage circuits.

When fixing several angles, the device contains the number of comparing triggers with the relay n delay elements equal to the number of these angles.

FIG. 1 shows a block diagram of the described device; pas figs. 2 is a diagram of the operation of the device; in fig. 3 shows the curves of the average current value in the latching relays.

The device contains a measuring symmetric trigger / s with two channels of fermentation of trigger pulses: from the induction sensor 2 of the rotor position and the voltage circuit of the generator 3.

The first channel of formation of the trigger pulse contains the amplifier-shaper 4 and blocking-generator 5, and the second - the amplifier-shaper 6 and blocking-generator 7. In addition, the second channel has a static phase shifter 8 for setting the device zero.

A stick out angle indicator 9 and a zero stick out angle value of the rotor is connected to the measuring trigger / switch. To fix the selected angle setting, use the pulse delay element 11 and

comparing trigger 12 with relay 13.

To fix the second setting, use the pulse delay element 14 and the comparison trigger / 5 with the relay 16. In the same way, n fixed settings can be obtained. For example, a multivibrator (Fig. 1) can be used as a pulse delay element.

The power supply unit 17 is preassigned to supply the necessary threading voltages to the device circuit.

From the induction sensor 2 of the rotor position, a positive polarity pulse is applied to the amplifier driver 4, which generates a pulse of polarity polarity with a steep leading edge and a duration of no more than 500 microseconds. This pulse is used to start the inhibitory blocking generator 5.

The latter forms pulses of negative polarity with a duration of 10 microseconds, which are nodded to one of the inputs of the symmetric measuring tringer 1.

The second input of the trigger / receive impulses formed as follows. From the voltage that is taken from the voltage transformer of the generator 3, ZSy Itel-shaper 6 forms np J oyfo Hbie pulses of duration

 Ci steep non-average front. These M.N pulses start up the 1st blocking generator 7, which generates pulses of positive and negative polarity with a duration of 10 microseconds. A positive pulse is applied to the input of trigger 1.

An indicator 9 of the rotor's stick out angle, which is a measuring device of the magnetoelectric system, is connected to one of the trigger arms /. The signal from the output of the measuring trigger 1 is proportional to the coasting angle of the rotor, therefore, the indicator 9 readings will correspond to the measured angle.

FIG. Figure 2 shows how the output of the measuring trigger increases as the angle of the rotor protrudes.

Pa the output of the measuring trigger is also connected to the relay 10, which records the transition of the rotor through a zero angle in the direction of 360 °. At this moment, the average value of the current in relay 10 (see FIG. Za) abruptly changes from zero to maximum, and on going from 360 ° to zero, vice versa. This achieves a clear relay operation with a factor of / return equal to one.

The angle setting is fixed as follows.

Using a retarded multivibrator 11, triggered from a blocking oscillator 5 or from amplifier 4, sets the duration of the reference pulse (FIG. 2) proportional to the selected angle setting. The reference impulse is differentiated: and a positive impulse is applied to one of the inputs of the comparative trigger 12. Pa second input of the trigger 12 nodes a positive impulse from the blocking generator 7 or from the shaping amplifier 6.

Thus, a comparison is made between the duration of the impulse corresponding to the run-out angle and the reference one. While the run-out angle is less than the setting of the relay 13 is not used immediately. When the rotor reaches the setpoint angle (60 °), the relay 13 will operate, since the current in lieM jumps over 1 to the maximum (Fig. 36). Similarly, the scheme of fixing the second setpoint works.

To install the device by changing the initial phase of the voltage vector of the generator in the second channel, an amplifier-shaper 6 is provided with a static phase shifter 8, which allows the phase to be changed by 65 °. The device is powered through a stabilized block 17 of the voltage from the generator paired circuits,

which increases the reliability of the device and does not require the use of a special power source.

The invention can be used at power plants for stationary measuring of the rotor's coasting angle, detecting generator operation modes and other purposes.

Subject invention

Claims (4)

1. A device for monitoring the rundown angle of the rotor of the generator, comprising a rotor rundown angle sensor, controlled by a pulse. With a voltage phase and an emf. the generator, and the task body for signaling to the executive body when the rotor’s stick out angle reaches a given value, characterized in that, in order to improve and increase reliability by performing an adjustable setpoint angle, the task contains a comparison trigger with a relay controlled by pulses with a phase generator voltage directly and pulses with a phase emf a generator through a delay element with an adjustable duration to create a voltage jump on the actuator when the specified angle is reached. 2. The device according to claim 1, characterized in that, in order to improve the accuracy of work, The control input channels of the device are switched on braked blocking headers. 3. The device according to claim., Characterized in that, in order to improve reliability of operation, The device is powered from the generator circuits. 4. The device of claim 1, characterized in that it contains the number of cprs (attenuating flip-flops from the relay and delay elements, the number of fixed angles. "In - 20 ° in-ff27ff -k, ff Sffff a PaSombT zone O VO t t then in