SU598178A1 - Synchronous generator slip and angle relay - Google Patents

Description

(54) RELAYS FOR SLIDING ANGLE SYNCHRONOUS GENERATOR In addition, it tightens it, i.e. it is enough to get out of order to one of the time relays, as the device ceases to control the slip of this sign. The aim of the invention is to increase reliability. Yes, in the proposed slip and synchronous generator relay, the RESISTANCE input of the second coincidence circuit is connected to the generator shaper of rectangular pulses. In FIG. 1 shows the block diagram of the proposed relay; in fig. 2.3 time diagrams of voltages at the outputs of the corresponding relay units during its operation, as a sliding relay and as an angle relay. The device contains drivers 1 and 2 rectangular pulses of monitored mains and generator voltage, inverter 3 network rectangular pulses, potential-pulse coincidence circuits 4 and 5, trigger 6 and relay and 8 times connected to the trigger outputs, respectively. Potentially pulsed coincidence circuits are connected by their inputs identically to driver 1 and 2, and circuit 5 is connected by a capacitive input through inverter 3. Circuits 4 and 5 coincidence and trigger b constitute a prominent device, and the potential-impulse coincidence circuit is its sensitive organ. When a potential-pulse circuit is applied to the inputs of the coincidence of rectangular pulses of the same r1 amplitude of different frequencies, acute-angular pulses of positive polarity are generated at its diode output; Only at those times; when, in the presence of a positive potential at its resistive (control) star, poh, the capacitive (HMiiyitb.cHoro) input potential changes from nonnegative to positive; :, This determines the following phase condition in the potential-impulse- operating mode: sheche 5 h; hollow (- for the case of fp-fj, (1) ft H fc O - for the case: ,, f,, (( 2) where the phase difference of the monitored voltages (Fig. 2), in the range of slip angles OI, which corresponds to half of the slip period, the potential-impulse coincidence circuit produces a series of acute-angled pulses following the mains frequency. is proportional to the slip period, as can be seen from the diagrams of Fig. 2. The duration i s, the pulse; pour, know the beginning of ti and the end of i of analysis. Considering that 211 (and 60 is where Td is the period of slip, we find 4.. a-Ф Ф Ф-Ф1., in 2Г, where ф and ф are the final values of the angle of the angles, expressed by expressions (1) or (2). Since these values, which characterize the principle of operation of the potential-pulsed coincidence circuit, are constant, then 2 ft coMbt K and. Thanks to the inverter, the series of output pulses of circuit 5 coincidence is shifted impulses of circuit 4. Since circuits 4 and 5 control the state of trigger 6, then the first impulse of one of the series of triggers p is set in one of the stable states at time i g J and the first pulse of the other seriiv another stable ,; state at time t g. If the glide value of Wg is greater than or greater than the specified one, then the relays 7 and 8 do not trigger, since the duration tg is less than the specified time setting i-g. At tgtg, relays 7 and 8 are triggered alternately in each slip period, indicating that the slip half period has become greater than the specified value, i.e.-. Slip #j is less than the specified one. Thus, over the period with nOMOttiH of one distinguishing organ and the two time relays are controlled by a given CHEC & lishenie regardless of its sign /) accelerates the synchronization of the generator and improves the reliability of the device in the output of one of the time relays. If a tachogenerator having the same frequency as the main generator and rigidly connected to its shaft is used as a model generator voltage sensor, the device, along with the slip control, can also monitor the geyrator internal angle setpoint. For this on, skoM. PHO8 ± 2 ± 2 supplies the voltage and rpV of the tachogenerator of such a phase that it is ahead of the voltage tJj of the network at any active generator load. This condition corresponds to the vector diagram (Fig. 3, a): where c, n, ac is the mode of zero and nominal loads and the achievement of a given angle value (in particular, the beginning of the asynchronous stroke); (c) internal generator angle, which characterizes the run-down of the rotor with respect to the unloaded position; So is the angle of adjustment of the operation of the device and the reserve (the latter may be necessary for the detuning from the operation of the generator when the generator is rocking to the motor area). Fig. 3b shows the state of the outputs of the corresponding units of the device during normal operation of rgHepa topa, only circuit 4 pulsates and circuit 5 does not produce output signals, therefore trigger 6 is biological in such a state that its output b therefore, the output of the relay 8 is a zero signal. FIG. 3, the generator is simulated in relation to the grid at the beginning of an asynchronous run, when the frequency of the generator has not changed. If the angle of 8 "increases and, becoming more than & n, takes the value S l; then 4 does not pulsate, and scheme 5 begins to generate sigals that move trigger 6 to a different position. If the specified state persists for t35, the relay 8 is triggered, signaling that the generator angle reaches a predetermined value, while relay 7 also triggers, but inversely: the output signal at the output will change . The set angle value is controlled by two output blocks, which ensures the reliability of the device. In the case of the asynchronous & go move, the system builds a barely slip, i.e. dvuzyda for ne {yod signals the presence of asynchronous twists. Thus, the device is equipped with; along with the control of slip, the function also controls the angle of the generator. The device.T 9O is implemented on logical elements of the Logic-T series, but can also be built on elements of other unified series. The proposed device allows you to control a given slip twice in a period, which reduces the reliability of the output blocks of the device and reduces the synchronization time. The effectiveness of the proposed device is also determined by the fact that it is built exclusively from typical units, which allows it to be implemented on unified functional and logical elements of any series. Due to this, if the device is implemented as part of the control logic system of the hydraulic unit, there is no need to design or use a special device, usually made of individual parts. This increases the uniformity and manufacturability of the entire logical system, ease of maintenance of the system, reduces capital and operating costs. Formula 1 of the invention. The slip relay and the angle of the synchronous generator, containing a trigger, each output of which is connected to a time relay, and each of the separate inputs are connected to the output of an impulse coincidence circuit, the capacitive and power supply inputs of one of which are connected to the network and generator square pulse driver, and capacitive input of the second coincidence circuit; connected to the network driver via an inverter. Characterized by the fact that, with an increase in reliability, the resistor input of the second combination circuit is connected to a generator driver of rectangular pulses. Sources of information taken into account during the examination: Application 1971434/07 Cl, H 02 J 3/40, 197 3,. On issued wounded io vyachi certificate.

r-rCDf I

l

 And I Mf /

Is-l

 t.