SU1228184A1 - Device for registering dynamic overload of electric power transmission with respect to angle and slip - Google Patents

Abstract

The invention relates to electrical engineering and can be used in emergency control automation of power systems. The chain of the invention is an increase in selectivity. When an emergency power shortage occurs in the receiving part of the power system or ... excess power in the transmitting part of the power system in the original mode, the characteristic value of $, the angle begins to increase (S and the rate of its change.) The output voltage of the difference sensor phase 1 and at the same time increases the voltage proportional to the rate of change of the phase difference of voltages (at the output of the slip block 5. When the sum of parameters 1-2 exceeds the p of the first stage, the reacting organ of the first Stage 3. If the sum of the parameters exceeds the value of the function F, then the functional pE) generator of the second or other higher stage 4 is triggered. At the device code, emergency unbalance latching signals are detected in the device. For the second stage, a certain value of emergency unbalance is selected, and the characteristics the firing of the first and second summing amplifiers simulate the phase trajectory when this unbalance is applied to any initial mode. 2 Il.

Description

The invention relates to electrical engineering, in particular, to anti-collision automation of power systems.

The purpose of the invention is to increase the selectivity of the device.

FIG. Figures 1 and 2 show the structure of the proposed device.

The device for fixing the dynamic overload of power transmission in angle and slip contains a sensor 1 of the phase difference of the voltages of the transmitting and receiving ends of the power transmission and the reacting organs, the first of which is designed to fix the boundary of the sky

Lance power. The output of sensor 1-15 works as follows. The first

to carry the voltage phases connected through the inertial amplifier 2 to the first input of the reacting body 3 of the first stage and to the first inputs of the reacting bodies of the 4 other stages, intended to fix emergency unbalances of power, exceeding the horizontal ones, the number of which is determined by the number of fixing emergency unbalances Second inputs reacting bodies 4 are connected directly to the output of sensor 1 of the phase difference of voltages, the second input of the reacting body 3 of the first stage and the third inputs of the reacting bodies of the 4 other stages are connected Eny to the output of the additionally inserted slip block 5. Responsive bodies 4 are made in the form of functional transducers designed to approximate phase trajectories with emergency power imbalances. Each of the functional converters 4 consists of two adders 6 with common inputs, which are also the inputs of the converter, and the output of each adder 6 is connected via threshold element 7 to one of the inputs of the AND 8 element, the output of which is the output of the functional converter 4.

The device works as follows.

When an emergency power shortage occurs in the receiving part of the power system or an excess power in the transmitting part of the power system in the initial mode, characterized by f, the angle $ begins to increase and the rate of its change –i 9 speed proportional voltage

changes in the phase difference of the stresses c5 ,, j at the output of the slip block 5.

When the sum of parameters (,,, S 1 l „

1-2

) exceeds the first stage, the first stage reacting body 3 is triggered. If the sum of the parameters exceeds the value of the function F, then the functional transducer 4 of the second or other higher level is triggered. In this case, at the output of the device, there appear signals of fixation of emergency unbalances.

Function Converter 4

0

five

0

five

0

five

0

55

the summing amplifier 6 with the threshold element 7 turned on at the fero output triggers if the phase path .n -f () exceeds the value of its pick-up setting; However, in this case, the device may not work. For its operation, it is necessary to trigger the second threshold element 7 turned on at the output of the second summation of amplifier 6. This is possible only if the entire phase trajectory is entirely located in the zone of operation of two summing amplifiers.

Phase trajectories with emergency power imbalances that exceed the boundary ones are open. Moreover, the type of trajectories makes it possible to approximate them in the zone of operation of the device in two sections. One of them is advisable to adopt horizontal, and the second - inclined, where the coefficient of slope is determined by the slope of the trajectory.

For the second stage (as for the higher stage), a certain emergency unbalance value is selected, and the response characteristics of the first and second summing amplifiers simulate a phase trajectory for this unbalance value for any initial mode. So, if the emergency unbalance exceeds the value of the corresponding emergency unbalance, then its path is located in the zone of operation of two threshold elements 7, the device triggers, In case the value of emergency unbalance is less, then the path can cross the triggering behavior of the first sum of the amplifier 6, but then out of range of the second. The device does not work.

Claims (1)

Invention Formula The device for fixing the dynamic overload of power transmission in angle and slip, containing a sensor of phase difference voltages of the transmitting and receiving ends of power transmission and reacting organs, the first of which is designed to fix the boundary unbalances of power, characterized in that, in order to increase the selectivity, the output of the sensor of phase difference It is connected through an inertial amplifier to the first input of the first stage reacting organ and to the first inputs of the reacting organs of the other stages intended for fixing emergency situations. x unbalances of power exceeding the boundary ones, the number of which is determined by the number of stages / -r Ot-i fixing emergency unbalances, the second inputs of which are connected directly to the output of the phase difference sensor, and the second input of the first-stage reacting authority and the third inputs of the reacting organs of the other steps are connected to the output of the additionally inserted slip block, the latter being designed as functional converters approximation of phase trajectories at. emergency unbalances of power, each of which consists of two adders with common inputs, is a single-phase also the converter inputs, and the output of each adder is connected via a threshold element to one of the inputs of the AND element, the output of which is the output of the converter. Editor I. Casarda Order 2293/53 Tehred I.Popovich Corr Sub Circulation 612 VNIIPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Uncle FfDeoStüio Figure 2 Proofreader A. T sko Subscription