SU1275644A1 - Device for measuring advance time of automatic synchronizer - Google Patents

Abstract

The invention relates to the field of electrical engineering, namely to automation of electric power systems. The purpose of the invention is to increase the accuracy and expand the working range of the slides. The angle between the output voltages of the phase-shifting elements 1 and 2 is always 90% and they are shifted by i 45 relative to their input voltage. The formers 7, 10 and 11, 14 form, at the time of transition through O, once in a period, short rectangular pulses. The shapers 8.9 and 12.13, after inversion, form two more pairs of pulses. The pulses at the output of the drivers of each channel successively occur after a quarter of the period of the input voltage. The pulses of the same name of each channel are received in pairs at the inputs of four electrons (/) cops And 15-18. When any pair of pulses coincides, the signal passes through the OR element 19 to the S input of the trigger 20, which stops the stopwatch 21, which is triggered by the output of the synchronizer. 2 Il. with 1 / g

Description

The invention relates to automation and relay protection of electric power systems, and specifically to devices for tuning and checking: automatic synchronizers "5

The purpose of the invention is improving accuracy and expanding the working range of the slides.

Figure 1 shows the structural diagram of the proposed device; on 1C of Fig. 2 is a variant of using a phase-shifting element with orthogonal outputs.

The device contains phase-shifting elements 1 and 2, inverters 3 and 4 of the leading voltage channel (U _c ), inverters 5 and 6 of the synchronized voltage channel (U _t ), drivers of 7-10 pulses of the channel of the driving voltage, formers 11-14 ® channel of the synchronized voltage, logical elements And 15-18. OR element 19, RS-trigger 20 and stopwatch 21.

2:

The first output of the phase-shifting element 1 of the channel U _{c is} connected to the input of the pulse shaper 7 and inverter 3, and the second to the input of the pulse shaper 10 and inverter 4. The outputs of inverters 3 and 4 are connected to the inputs of the pulse shapers 8 and 9, respectively. The outputs of the shapers 7-10 are connected to the first inputs of the logical elements 15-18 matches, respectively. ³

The first output of the phase-shifting element 2 of the channel U _{f is} connected to the input of the pulse shaper 11 and the inverter 5, and the second to the input of the ⁴ pulse shaper 14 and the inverter 6. The outputs of the inverters 5 and 6 are connected to the inputs of the pulse shapers 12 and 13, respectively. The outputs of the pulse generators 11-14 cheny ⁴ connected to second inputs of the coincidence gates 15-18, respectively. The outputs of the coincidence logic elements 15-18 are connected to the inputs of the four-input element OR 19, the output of which ⁵ is connected to the S-input of the trigger 20 .. Its R-input is connected to the output of the auto-synchronizer, and the output to the input of the stopwatch 21. Each phase-shifting element 1 and 2 represents a chain consisting of series-connected resistor 22 and capacitor 23.

The device operates as follows.

The voltage of the network (U _c ) and the synchronized generator (U _r ) <The angle between the output voltages of the phase-shifting elements 1, and 2 and / of one channel and U _f and U _r ' ^{1 of the} other channel) is always equal to 90 el. hail., and relative to their input voltage they are shifted by ^ 45 el. hail. at the rated frequency “if the condition (and: ') = (and;) is satisfied _; <<) = (and ·;).

Of these voltages, at the moment of going through zero once a period, short rectangular pulses of duration ΐ are formed (the outputs of the shapers 7.10 and 11.14). Of these voltages, after inversion (elements 3.4 and 5.6), two more pairs of pulses are formed in the same way (outputs of the shapers 8.9 and 12.13 pulses). Thus, the pulses at the output of the shapers of each channel sequentially occur after a quarter of the input voltage period, i.e. every 90 email hail.

The same pulses of each channel in pairs arrive at the inputs of the four elements And 15-18. If any pair of pulses coincides, i.e. when a signal appears at the output of any of the elements 15-18, the signal passes through the OR element 19 to the S-input of the trigger 20, which stops the stopwatch 21. The start of the stopwatch 21 is carried out by the output signal of the auto-synchronizer.

Claims (1)

"The invention relates to automation and relay protection of electric power systems, and specifically to devices for tuning and testing automatic synchronizers." The purpose of the invention is to increase the accuracy and extend the working range of the slides. Fig. 1 shows a block diagram of the device in Fig. 2, a variant of the use of a phase-shifting element with orthogonal outputs. The device contains phase-shifting elements 1 and 2, inverters 3 and 4 channels of the leading voltage (U), inverters 5 and 6 of the channel of the synchronized voltage (), drivers 7-10 of the pulses of the channel of the leading voltage, shapers 11-14 of the channel of the synchronized voltage, logical elements AND ,, element OR 19j RS-trigger 20 and stopwatch 21. First output of phase-shifting element 1 of channel Uj. connected to the input of the driver 7 pulses and inverter 3, and the second to the input of the form. bodies 10 pulses and inverter 4. The outputs of the inverters 3 and 4 are connected to the inputs of the formers 8 and 9 pulses, respectively. The outputs of the formers 7-10 are connected to the first inputs of the logical elements 15-18, respectively. The first output of the phase-shifting element 2 of the U channel is connected to the input of the pulse former 11 and inverter 5, and the second to the input of the pulse former 14 and inverter 6. The outputs of inverters 5 and 6 are connected to the inputs of the pulse former 12 and 13, respectively. Blind: The odes of the formers of 11–14 pulses are connected to the second inputs of the logic elements 15–18 coincidence, respectively. The outputs of the 15 coincidence logic elements are connected to the inputs of the four-input ShZh 19 element, the output of which is connected to the S three-input input 20. The R input is connected to the auto-synchronizer output and the output to the stopwatch input 21. Each phase shifting element 1 and 2 represents A chain consisting of a series of series-connected resistors 22 and a capacitor 23, 1 4 works as follows: Its input is: the voltage of the network (Uc.) And the generator being synchronized (), the angle between the output voltages of the phase-shifting elements 1 and 2 (Ug and one channel,.,. And the other channel) is always equal to 90 el. hail, and with respect to its input voltage, they are shifted to e-grad, at the nominal frequency, if the condition (s) (and) are fulfilled; (and;) (and;), Of these voltages, short rectangular pulses of duration f (the outputs of the formers 7.10 and 11.14) are formed once a period at the moment of the transition (of the voltages after inversion) , 4 and 5.6) two more pulse pairs are formed in the same way (the outputs of the formers are 8.9 and 12.13 pulses). Thus, the pulses at the output of the formers of each channel successively appear after a quarter of the period of the input voltage, t, e “every 90 el, degrees. The identical sh-pulses of each channel are received in pairs at the inputs of the four elements And 15-18. If any pair of pulses coincide, i.e. when a signal appears at the output of any of the elements 15--18, the signal passes through the element ШШ 19 to the S input of the trigger 20, which stops the stopwatch 21. The start of the stopwatch 21 is performed by the output signal of the auto-synchronizer. Apparatus of the Invention A device for measuring the advance time of an automatic synchronizer. Comprising a leading voltage channel and a synchronized voltage channel, each of which includes a pulse driver, an AND element, whose inputs are connected to the outputs of the driver of both channels, RS trigger, R - whose input is associated with the synchronizer under test, and a stopwatch connected to the output of the RS flip-flop, characterized in that, in order to improve the measurement accuracy and expand the working range of the slides, each The input phase shifting element with two orthogonal outputs, three additional pulse shapers j two inverters, three AND elements and an OR element, with two pulse shapers connected to one phase of the 444 shifting element: one directly, the other through an inverter, and two others - in a similar way to another output, the outputs of the same-named pulse formers of each channel are connected in pairs to the additionally introduced three elements of willow. the moves of all the elements AND are connected to the input of the “K5 flip-flop through the element OR. FIG. 2