SU1032522A1 - Device for automatic control of substation bus voltage - Google Patents

Abstract

DEVICE FOR AUTOMATIC CONTROL VOLTAGE FOR TIRE SUBSTATION under load, comprising veds iye and veduischy parallel-connected transformers, Automatic cal regulator voltage measuring input kotoryugo through the measuring transformer is connected to the buses substation, position sensors and actuators transformers, signal repeater PrFgbavit repeater signal Reduce, characterized in that, with price; 1 increase reliability of operation when regulating different types of transformers, with different the number and magnitude of the control steps, it is equipped with a control element of the beginning, and end of the switching cycle of the master transformer and control units of the slave transformers, each of which contains a repetition of prohibited positions, a repeater of allowed positions, a control element of the beginning and end of the switching cycle and the element of fixing the direction the first output of the prohibited position repeater is connected to the first input of the control element of the start and end of the switching cycle, the second repeater output prohibited provisions connected to the first input of the switching Element locking direction. The first output of the control element of the start and end of the switching cycle is connected to the output of the repeater of permitted positions, forming the first output of the control unit by the transformer, the first output of the drive of the driven transformer is connected to the second input of the control element of the beginning and end of the switching cycle of the driven transformer , the first output of the position sensor is connected to the input of the forbidden-position repeater, forming the second input of the slave control unit The second output of the position sensor is connected to the input of the repeater of permitted positions (LI, forming the third input of the slave transformer control unit, output Add the switching direction fixation element to the first drive of the slave transformer, forming the second output of the slave transformer control unit , output Turn off the fixing element of the switching direction is connected from to to the second input of the drive of the slave transformer, forming the third output of the control unit of the driven trans The first controller output of the control unit to to the slave transformers are interconnected and connected to the first input of the automatic voltage regulator and to the first output of the control unit of the leading transformer and connected to the first input of the automatic voltage regulator; elements connected in series to control the start and end of the switching cycle of the slave grasifiers that are connected to the second input of the automatic the voltage regulator, the third output of the control element

Description

: drive switching cycle: the formator is connected to the third input of the automatic controller, voltage: or, output Add the automatic voltage regulator through the repeater connected to the first input: drives of all transformers and to the second input of the latching element of the switching direction of each A transformer, forming the fourth input of the control unit: home transformer, output Uba; enter. automatic regulator

the voltage through the repeater is connected to the second drive inputs of all transformers and to the third input of the switching direction fixing element of each slave transformer, the fifth input of the slave transformer control unit, the second output of the slave transformer drive is connected to the input of the position sensor, and the output of the drive of the transformer is connected to the input of the control element for the start and end of the switching cycle of the lead transformer.

The invention relates to the automatic regulation of electrical power supply networks and can be used at electrical substations for automatic voltage control of different types parallel to the switched-on transformers under load control (.RND). An automatic voltage regulator for power transformers, containing an adjustment path, consisting of a current sensor, an input switch, an element adder, a zone change, a setpoint change element, a measuring one. organ and two control channels, which are made on integrators, time delay and output elements: relays, control and monitoring unit and clock generator. The control and monitoring unit includes c. The input switching element itself, the additional parameter fixation element, the regulator malfunction control element and the electric actuator control element. To control the same type and different types (in particular, the switching time of the on-load tap-changer devices) by the generator electric drives, it is designed to change the pulse period Cl3. A disadvantage of the described device is that it is unsuitable for automatic control of the load on different types of parallel connected transformers with an on-load tap-changer, which have different numbers and magnitudes of the regulation steps, due to the limited limits of the voltage regulation, since the transformer with a smaller number m vom stages and transformers bolshimkolichestvom steps mismatch occurs when switching actuators tap changer and further work is blocked automatic voltage regulator. The closest in technical essence and circuit design to the present invention is a device for automatic regulation of voltage on substation tires, containing parallel-connected transformers, voltage regulator, the measuring input of which is connected via voltage transformer to substation buses, error control units, sensors the positions of the stages of the on-load tap-changers and actuators, logical elements of the type And and Prohibition (2. The disadvantage of the known device is that it is unreliable when adjusting These transformers connected in parallel with RPN with different number and size of control steps, due to limited voltage control limits, as the transformers mismatch when switching the on-load tap-changers and further automatic voltage regulator is blocked. when switching, the on-load tap-changer tropribory for all transformers each time only one level appears inadmissible equalizing, additional but loading transformers, and with significant equalizing currents, the protection of transformers can be triggered and disconnected. The purpose of the invention is to increase the reliability of the device when regulating transformers of different types with parallel connected transformers having different numbers and sizes of levels of regulation. The goal is achieved by the fact that a device for automatic voltage regulation on substation busbars under load contains a J10 master, and slave parallel-connected transformers, an automatic voltage regulator whose measuring input is connected to substation buses, position sensors and actuators of transformers via a measuring transformer , the signal repeater Add, the signal repeater Reduce, additionally contains the element of control of the beginning and end of the switching cycle of the leading transform tori and control units for slave transformers, each of which contains, a prohibited position repeater, a repeater of permitted positions, a control element for the start and end of the switching cycle and a latching switching element, the first output of the forbidden position repeater is connected to the first input of the control of the start and the end of the switching cycle, the second output of the repeater of forbidden positions is connected to the first input of the switching direction fixation element, the first output of the control element The start and end of the switching cycle is connected to the output of the element of permitting positions, forming the first output of the slave transformer control unit; connect the first output of the slave transformer drive to the second input of the element; control the start and end of the switching cycle of the slave transformer, forming the first input of the slave transformer control unit, the first The output of the position sensor is connected to the repeater input of the prohibited positions, forming the second input of the control unit according to the transformer, the second output position is connected to the input of the allowed positions repeater, forming the third input of the slave transformer control unit, output Adding the switching direction fixation element is connected to the first input of the slave Transformer drive, forming the second output of the slave transformer control unit, output Reducing the switching direction fixation element is connected to the second input of the slave actuator transformer, forming the third output of the slave transformer control unit, the first outputs of the slave control transformer They are connected to each other and to the first output of the control element of the beginning and end of the switching cycle of the master transformer and connected to the first input of the voltage regulator, the second output of the control element of the beginning and end of the switching cycle of the driving transformer is connected to the series-connected control elements of the beginning and end switching cycle of the slave transformers, which are connected 2 to the second input of the voltage regulator, the third output of the control element of the beginning and end of the switching cycle of the driving power The transformer is connected to series-connected control elements of the start and end of the switching cycle of the slave transformers, which are connected to the second input of the voltage regulator, the third output of the control element of the beginning and end of the switching cycle of the leading transformer, the output Add automatic voltage regulator through repeat.: the coil is connected to the first inputs of the drives of all transformers and to the second input of the switching direction fixing element each slave transformer, forming the fourth input of the slave transformer control unit, output Deactivate the automatic voltage regulator through a repeater connected to the second drive inputs of all transformers and to the third input of the switching direction fixation element of each slave transformer, forming the fifth input of the slave transformer control unit , the second output of the drive of the slave transformer is connected to the input of the position sensor, and the output of the drive of the leading transformer is connected to the input of the terminal element roll start and end cycle master switching transformer. Introduction to the device of control units of the slave transformers and the element of the beginning and end of the switching cycle of the lead transformer ensured reliable operation of the device when regulating different types of transformers having different numbers and sizes of stages of regulation. The control element of the start and end of the switching cycle of the master transformer allowed the start, in combination with the control elements of the start and end of the switching cycle, to be driven by the slave transformers, and the end, in combination with the repeaters of the allowed positions, of one complete switching cycle. A complete switching cycle consists of two switching phases. The first switching phase consists of switching all transformers one stage using an automatic voltage regulator. The second stage of switching consists of switching using control units to one or several stages of regulating only the driven transformers. A set-up program is entered into the control units of the driven transformers by means of two signals from the position sensors of the driven transformers.

transformers

allowed positions

The repeaters of the forbidden positions of the slave transducers repeat the signals of the forbidden positions received from the position sensors in order to prepare the switching circuit for the second stage and determine the beginning of the complete switching cycle with the help of controls to start and end switching cycles.

The repeaters of the allowed positions of the slave transformers repeat the signal. Allowed: the positions received from the position sensors to determine, in combination with the control elements of the beginning and end of the switching cycles of the slave and the lead transformers, determine the complete switching cycle.

The latching elements of the switching direction of the slave transformers to prepare circuits for the implementation of the second switching step in the same direction: Add or Diminish as from the automatic voltage regulator when switching in the first full switching cycle.

FIG. Figure 1 shows a functional diagram of a device for automatically adjusting voltage, busbars, substations; in fig. 2 - electric circuit of automatic voltage regulator is functional.

The device for automatic voltage regulation on substation buses contains a master transformer 1, slave transformers 2 and 3, the master being a transformer with a smaller number of adjustment steps, but with a greater value of each step, and a separate transformer 2 and 3 with a greater number of steps, but with a smaller value of each stage, automatic voltage regulator 4, voltage transformer 5, substation buses, sensor position 7 and 8 of the levels of slave transformers 2 and 3, electric drives 9-11, a transformer 1-3, the blocks 12 and driven transformation tori control unit 13 2 and 3, the repeater 14 and 15 add the signals and subtract control element 1 beginning and ending the cycle master switching transformer 1.

The blocks 12 and 13 of the control of the slave transformers 2 and 3 contain, respectively, repeaters 17 and 18, prohibited positions, repeaters 19 and

20 permitted positions, elements

21 and 22 control the start and end of the switching cycle of the slave transformers 2 and 3, the elements 23 and 24 of fixing the switching direction.

Automatic regulation of voltage level 4 (fig. 1 and fig. 2) with four inputs: input A, input B,

input, in, Measurement and two outputs: Add, Decrease contains adder 25, element 26 of forming and changing the zone, element 27 of setting and changing the voltage setting, threshold organ 28, converters 29 and 30, elements 31 and 32 of time, elements 33 and 34 prohibit the executive elements 35 and 36, the element 37 of changing the period of the generator 38 clock pulses (GTI), the element 39 of the control system of the control system, containing the element 40 of the control corrects the regulator and the element 41 of the control of the electric drive, the element 42 of the switch lucheni

The device works as follows.

For transformers 1-3, a program of switching actuators 9–11 is carried out, in accordance with the position table of the regulation stages, in which the allowable and prohibited positions of the voltage regulation stages are determined from the condition of the admissible parallel operation of the transformers. In those positions of the stages in which the prolonged parallel operation of the transformers is not allowed, one or two electric drives are additionally switched to the next stages, allowing long-term parallel operation of the transformers. . When the voltage on busbars 6 of the substation changes, for example, in the direction of decreasing the voltage to the value of the pickup setting, the automatic voltage regulator 4 gives a signal

 To add

and through the repeater

14 A signal is added to the actuators 9-11. The drive is started 9 - 1.1. One Add

temporary signal

from

the automatic voltage regulator 4 is supplied to the switching direction fixing elements 23 and 24.

Some are in position

Bavit and prepare the circuits for additional switching of the electric drives 10 and 11 from the control units 12 and 13 in the same direction as from the automatic voltage regulator 4. Having started the electric drives 9-11, they become self-holding along the chains of the electric drives to complete the switching cycle by one step. With the adoption and self-holding of all electric drives 10-11, the input to and input B of the automatic voltage regulator 4 sends to the switching element 42 a signal about the beginning of the switching cycle of all electric drives from series-connected control elements 16, 21 and 22 the end of the switching cycles of the corresponding elektrrprivodov 9-.ll As a result, in the automatic regulator, on the 4th direction using the switching element 42, the deadband will be increased and the signal will be removed. EC .-. And after switching the electric actuators 9-11 from the automatic regulator 4 voltage per stage, the sensors 7 and 8 positioning the electric motors 10 and 11 of the driven transformers 2 and 3 set the forbidden positions according to the position table steps, the signals of the prohibited positions of the steps from the sensors 7 and 8 steps enter. In blocks 12 and 13 of the control of the respective slave transformers 2 and 3, to the input of the repeaters 17 and 18 of the forbidden positions, from the output of which the signals go to the inputs of the fixing elements 23 and 24 the switching directions and taking into account the switching fixed from the automatic controller 4, for example, Add, the signals are sent to the actuators 10, 1 and there is an additional switching of the actuators 10, 11 without a delay of one or more steps until sensors 7 and The positions of the steps will not fix the permitted positions according to the table of the positions of the steps for electric actuators 9-11. In this case, the signals of the allowed positions of the steps from the sensors 7 and B of the respective actuators 10 and 11 are fed to the control units 12 and 13 on the inputs of the repeaters 19 and 20. the step position steps and to the input A of the automatic voltage regulator 4 on the switching element 42. As a result, in the automatic voltage regulator 4 is removed by switching element 42 an increase in the dead zone and if the voltage on the buses b substation exceeds the setting of the operation of the automatic regulator 4 voltage to Add or Reduce, then it again sends a signal to switch electric drives 9-11 in the sequence described above. Switching the actuators 9-1 according to a predetermined program is carried out with automatic control of the correctness of the execution of this CJie program in the following way (FIG. And Fig. 2). Information about the beginning of one complete switching cycle at electric drives 9-11 of transformers 1-3 is generated when all series-connected elements B 16, 22 and 21 are triggered, which close circuit B and input B at automatic voltage regulator 4. When the circuits of the input B and vhrd B are closed in the automatic voltage regulator 4, the switching element 42 is triggered and increases the dead zone. As a result, in the automatic voltage regulator 4, the actuator 36 (35) removes the signal to Add (Decrease). Information on the completion of one complete switching cycle at the actuators 9-11 is formed by means of parallel-connected elements 16, 21f 22, 19, 20, which first when the actuators 9-11 start up, trigger and create a 1 d7t self-hold input circuit. element 42 is re-connected to the key in the automatic voltage regulator 4, and then, when all the electric drives 9-11 are terminated of the same ON. FUNCTION switching cycle with reaching the allowed positions of the steps, return to the initial position and close the circuit A at the automatic regulator 4, stresses and removes self-holding at switching element 42. As a result, in the automatic voltage regulator 4, the increase in the insensitivity zone is removed and it is again ready to issue a signal to Add (Decrease). If the switching program of the electric actuators 9-11 disrupts the switching program, for example, from the occurrence of faults in the electric drives, in the automatic voltage regulator 4 or in the elements of the device for automatic regulation of the voltage on substation buses, then in the automatic voltage regulator 4 The switch 42 will not return to its original position and will continue to increase the deadband. In this case, the automatic voltage regulator 4 will block (prohibit) the issuance of signals to Add (Decrease) and it will receive a malfunction signal. The use of the invention will allow reliable automatic voltage regulation under load on transformers of different types operating in parallel, with different number and magnitudes of voltage regulation steps due to the use of transformer control units in the device, as well as improving power quality and economy of the power system at the expense of reducing losses energy in the mains.

Claims (1)

DEVICE FOR AUTOMATIC VOLTAGE REGULATION ON THE SUBSTATION TIRES under load, containing slave and leading parallel-connected transformers, an automatic voltage regulator, the measuring input of which is connected to the substation buses through the transformer, position sensors and transformer drives, the signal repeater `` Add '', signal '' Reduce * '', which is πη4 with the fact that, in order to increase the reliability of operation when regulating transformers of different types having different e is the number and ~ magnitude of the control steps, it is equipped with an element ^ for controlling the beginning and end of the switching cycle of the lead transformer and control units for the slave transformers, each of which contains a repeater * of forbidden positions, a repeater of permitted positions, an element) for controlling the beginning and end of the switching cycle and an element for fixing the direction of switching, while the first output of the repeater of the prohibited positions is connected to the first input of the control element of the beginning and end of the switching cycle, the second the travel of the repeater of prohibited positions is connected to the first input of the Element for fixing the direction of switching, the first output of the control element for the beginning and end of the switching cycle is connected to the output of the repeater of permitted positions, forming the first output of the control unit of the slave transformer, the first output of the drive of the slave transformer is connected to the second input of the control element and the end of the switching cycle of the slave Transformer, forming the first input of the slave transformer control unit, the first output of the floor sensor It is connected to the input of the repeater of prohibited positions, forming the second input of the control unit of the slave transformer, the second output of the position sensor is connected to the input of the repeater of allowed positions, forming the third input of the block C2 transformer, control slave output '’Add’' SU .. „1032522 x I <gG | the switching direction element is connected to the first input of the slave transformer drive, forming the second output of the slave transformer control unit; the output `` Reduce '' the switching direction fixation element is connected to the second input of the slave transformer drive, forming the third output of the slave transformer control unit ^ first block outputs the control transformer slaves are interconnected and with the first output of the control element of the beginning and end of the switching cycle of the lead transformer and are connected to the input of the automatic voltage regulator, the second output of the control element of the beginning and end of the switching cycle of the lead transformer is connected to series-connected elements for controlling the beginning and end of the switching cycle of the slave transformers, which are connected to the second input of the automatic voltage regulator, the third output of the start control element and the end of the switching cycle of the lead transformer is connected to the third input of the automatic voltage regulator, the output is' 'Add' * automatically the voltage regulator through the repeater is connected to the first inputs of the drives of all transformers and to the second input of the element for fixing the switching direction of each slave transformer, forming the fourth input of the slave transformer control unit, the output is 'Reduce *'. the automatic voltage regulator through the repeater is connected to the second inputs drives of all transformers and to the third input of the element Fixing directions, switching each slave transformer, forming the fifth input of the slave control unit transformer, the second output drive of the slave transformer is connected to the input of the position sensor, and the output of the drive of the lead transformer is connected to the input of the control element of the beginning and end of the switching cycle of the lead transformer.