RU2292621C1 - Device for fast action automatic engagement of reserve - Google Patents

Abstract

FIELD: electric engineering, in particular, devices of counter-emergency automatics of electric power systems of industrial factories, possible use for fast action automatic engagement of reserve.

SUBSTANCE: technical effect is achieved due to feeding of increased voltage from previously charged capacitors onto electric magnets for disabling input switches, simultaneous feeding of increased voltage from previously charged capacitors and direct voltage from network to electric magnet for enabling section switch, for controlling simultaneousness of decrease of voltages of main and reserve sources and for blocking operation of fast action devices for automatic engagement of reserve for the time of removal of emergency by means of forbidding signal time delay block and automatic restoration of operation of fast action devices for automatic engagement of reserve due to control over restoration of voltage in power circuit of sections of buses of sub-stations by means of maximal voltage relay.

EFFECT: increased speed of operation and reliability of operation of device.

3 cl, 3 dwg

Description

The invention relates to electrical engineering, in particular to emergency automation devices for power supply systems of industrial enterprises, and can be used for high-speed automatic inclusion of a reserve (BAVR).

A BAVR starting device for switchgear 6-10 kV / 1 / is known, consisting of six starting minimum voltage relays, one starting and one blocking block for controlling the angle δ between the voltage vectors of the main and backup bus sections, two blocking power direction switches that react to changes in the active direct sequence power at the main and backup input, block of logic elements and three executive relays. In the event of a three-phase short circuit (short circuit) in the power supply circuit or a false (spontaneous) circuit breaker tripping in the substation power supply circuit, and, consequently, when the voltage drops below the specified value (U <U _back ) or the angle δ is exceeded between the specified vectors of the specified value (δ> δ _back ) and changing the direction of the active power of the DR from the consumer buses to the power source, the starter unit switches the bus section that has lost the power source to the backup power source. This BAVR starter increases the efficiency of automatic switching of the reserve (ATS) due to the rapid detection of power loss during three-phase faults or during false (spontaneous) tripping of circuit breakers in the power supply circuit of sections of substation buses and effectively blocks operation in the event of a fault on outgoing lines or on busbars substations. The main disadvantage of this BAVR starting device is the low efficiency of its operation in substations with dependent power sources when a ring appears on the side 10-35-110 due to the peculiarities of the network operating mode or during repair work. In these networks, when a short circuit occurs, a simultaneous decrease in voltage occurs at both inputs of the substation bus sections. In this case, the starting device can operate faster on one of the inputs, even if there is a signal delay (by 0.01-0.015 s) in the logic of its operation. This leads to the disconnection of the input switch on this channel and the automatic inclusion of the section switch. Since there is also no voltage on the second input, the substation is de-energized on both inputs. The second disadvantage of this BAVR starting device is also the impossibility of blocking the busbar section with a small connected load, when the current at the input after the current transformer does not exceed 0.2 A. For example, with a current transformer transformation coefficient of _Km = 300, the primary current on one input can be up to 60 A, which often happens at substations at consumers for technological reasons. With such loads on one input and when short-circuit occurs on the buses or on the outgoing lines, the starter unit can turn off the input with a low current load and turn on the emergency section to the second power source, which can lead to a disconnection of the second input when the relay protection of the section switch fails.

A device for automatically turning on the reserve / 2 /, containing the main and backup power sources, input switches, equipped with acceleration shutdown units, the first and second section of substation buses, a section switch equipped with an acceleration on and off accelerator, made in the form of an energy storage device and induction coil dynamical system starting unit ABP connected to the voltage transformers and current first and second sections and substations tire is triggered by voltage level on the section (U <0,6U _n) or carbon (δ> δ _ass = 10-15 °) between voltage vectors and emergency backup bus sections, two contactor placed in drives input switches, normally open auxiliary contact section switch, two current sensors, two logical element 2I, an AND gate and two 2or signal delay element. In the event of a power loss, for example, by the first section of the substation's tires, the starting block is triggered by the voltage level at the section or by the angle between the voltage vectors of the emergency and reserve bus sections and gives a signal to trigger the acceleration block for opening the breaker at the first output of the starting block. This signal also passes to the third output of the launch block. The acceleration block for opening the input circuit breaker due to operation causes the circuit breaker to close within 0.003 s and knocks the trip latch in the input circuit breaker drive of the emergency section. The contactor sends a signal from the third output of the starting block to the operation of the acceleration unit for turning on the sectional switch and the last switches on during 0.03-0.055 s. Thus, the total time of a power outage is the sum of the time the power loss was recorded and the signal was issued by the starting block (0.04- 0.06 s), the operation of the acceleration block for opening the circuit breaker and the contactor (0.003 s), the operation of the acceleration block for turning on the section switch (0.003 s) and the time for switching on the section switch (0.03-0.055 s) is 0.076-0.121 s. In case of a possible failure of the input circuit breaker drive, a circuit breaker circuit breaker circuit breaker is provided due to constant current monitoring at the inputs using current sensors, 2I and 2OR logic elements and signal delay elements. The use of this device improves the speed of the automatic transfer switch due to the use of contactors in the drives of the input switches and the acceleration device for turning on the sectional switch, made on the basis of the energy storage device and the coil of the induction-dynamic system. However, the presence of additional mechanical contactors in the drive of the input switches and a special coil of the induction-dynamic system in the drive of the sectional switch significantly reduces the reliability of these switches. In addition, the presence of an accelerated circuit breaker circuit breaker in case of failures of the input circuit breaker drive using current sensors, logic elements and delay elements significantly complicates the circuit of the ATS devices and, as a result, reduces the reliability of the ATS.

The technical result when using the invention is to increase the reliability of the performance of the device BAVR.

Figure 1 shows a single-line diagram of a substation with switches, voltage, current transformers and a block diagram of a device for high-speed automatic inclusion of a reserve (BAVR). Figure 2 presents a diagram of the execution unit of the acceleration shutdown of the input switch, and figure 3 is a diagram of the acceleration unit of the inclusion of the sectional switch.

Figure 1 marked: 1, 2 - the main and backup power sources; 3, 4 - input switches; 5, 6 - acceleration shutdown blocks of input switches; 7, 8 - the first and second section of substation tires; 9 - sectional switch; 10 - unit for accelerating the inclusion of a sectional switch; 11, 12 - voltage transformers of the main and backup power sources; 13, 14 - voltage transformers of the first second busbar sections; 15, 16 - current transformers; 17, 18 — direct sequence active power direction blocks, the first inputs of which are connected to current transformers 15 and 16, the second inputs to voltage transformers 13 and 14 of the first and second bus sections, and the third inputs are cross-connected to voltage transformers 14 and 13 of the second and first tire sections; 19, 20 - starting blocks for monitoring the angle between the voltage vectors of the first and second bus sections, connected to the phases of the same voltage voltage transformers 13 and 14 of the first and second bus sections; 21, 22 - three-phase undervoltage relays connected to voltage transformers 13 and 14 of the first and second bus sections; 23, 24 - two-phase maximum voltage relays connected to voltage transformers 11 and 12 of the main and backup power sources; 25, 26, 27, 28 and 42 - signal delay elements; 29, 30, 31 - logical elements 2 OR; 32, 35, 36, 37 and 38 - logical elements 2I; 33 - logical element 2I-NOT; 34 is a blocking block for controlling the angle between the stress vectors of the first 7 and second 8 bus sections; 39, 40 - elements of the FORBIDDEN; 43, 44 and 45 - logical elements 3I; 41 is a block of the exposure of the inhibitory signal from the logic element 2I-NOT for 30-180 minutes and changing the output signal of the level "0" to the signal of the level "1" when a second signal of the level "1" signal from the logic element 2I 32 appears; 47, 48 - the first and second blocks PROHIBIT the first and second bus sections, which prevent the signal from passing through the logic elements 3I 43 or 44 when the switch of one of the inputs 3 or 4 is turned off in the presence of a prohibiting signal of relay protection of the inputs, as well as when the section switch is turned on; 46 - the third block is PROHIBITED, prohibiting the passage of the signal through the logic element 3I 45 when the position or relay protection of the section switch 9 is on, but allowing the passage of the signal when the input switch of one of the inputs is turned off; 49, 50 and 51 are executive relays.

In figure 2 are indicated: 52 - step-up transformer from 220 V to 675 V; 53 - rectifier diode bridge; 54 - the first charging resistor; 55 and 56 - rectifier diodes; 57 and 58 - resistors of the voltage divider; 59 - storage capacitor for charging voltages up to 950 V; 60 - switching thyristor; 62 - control relay control circuit switching thyristor; 63 and 64 - opening and closing contacts of the control relay 62 of the control circuit; 65 - charging capacitor for generating a signal for opening a switching thyristor; 66 and 67 - the first and second limiting resistors in the control circuit of the switching thyristor; 68 - smoothing capacitor in the thyristor control circuit; 61, and 71, first and second isolation diodes; 69 - reverse diode; 70 - make contact of the Executive relay (figure 1) 49 or 50.

Figure 3 marked: 72 - NO contact of the Executive relay 51 (figure 1); 73 - an additional capacitor connected in parallel with the storage capacitor 59 (figure 2); 74, 75 - the third and fourth isolation diodes; 76 - capacitor for charging with reverse voltage to close the switching thyristor; 77 - additional thyristor for generating a signal to close the switching thyristor; 78 is a second charging resistor for charging the capacitor 76 with reverse voltage when opening the switching thyristor; 79 - an additional resistor, 80 - an additional diode, 81 - a zener diode in the control circuit of an additional thyristor 78 to limit the signal by current and voltage; 82 - the fifth dividing diode of the electromagnet turning on the sectional switch.

The BAVR device operates as follows.

In normal mode, consumers of each section of the substation's buses are supplied with power from their own power supply 1 and 2, while the input switches 3 and 4 are turned on, and the section switch 9 is turned off. The active power direction relay 17 and 18 is in a blocked state due to the active power direction from the source to consumers and there are no signals at the output of these relays and at the second inputs of logic elements 3I 43 and 44 the signals are equal to logical "0". At the outputs of the starting blocks 19 and 20 of the control of the angle between the vectors of the first and second bus sections, three-phase undervoltage relays 21 and 22, the signal is also equal to "0" and, therefore, at the outputs of the signal delay elements 25 and 26, logic elements 2 OR 29 and 30, logical elements 2I 35 and 36, logical elements 3I 43 and 44, logical elements 2I 37 and 38, logical element 2 OR 31 and logical element 3I 45 signals are also equal to "0". Two-phase relays of maximum voltage 23 and 24, connected to voltage transformers 11 and 12, are in the operating state and at the output of the delay elements of the signal 27 and 28, and at the first and second input of the logic element 2I 32 and at its output there is a signal of level "1" , which is supplied to the second input of the shutter speed shutter block 41. Due to the fact that the signal is "0" at the output of the three-phase relay of minimum voltage 21 and 22, the signal is also equal to "0 at the first and second input of logic element 2I-NOT 33 " Therefore, at the output 2I-NOT 33 the signal is "1". The exposure block of the inhibit signal 41 at the first and second input has a signal of level "1", therefore, at the second inputs of logic elements 2I 37 and 38, the signal is equal to "1". However, at the first inputs of logic elements 2I 37 and 38 there is a signal of level "0" and therefore at the inputs of actuating relays 49 and 50 and at the first and second input of logic element 2 OR 31 and at the second input of logic element 3I 45, the signal is "0". At the first input of the logic element 3I 45 there is a signal of level "1" from the block FORBID 46, since the section switch 9 is turned off, and there is no signal from the relay protection of this switch. At the third input of the logic element 3I 45 there is also a signal of level "1" from the delay element of the signal 42 due to the lack of working conditions of the blocking block 34 for controlling the angle between the voltage vectors of the first 7 and second bus sections. Thus, the executive relays 49, 50 and 51 do not work, the input switches 3 and 4 are turned on, and the section switch 9 is turned off.

In the block for accelerating the opening of the input switch 5 or 6 (Fig. 2), the storage capacitor 59 is charged with a constant voltage of 950 V, the charging capacitor 65 is charged with a constant voltage of 15 V through a voltage divider with resistors 57 and 58, and the smoothing capacitor 68 is charged with a constant voltage of 24 V, the make contact 70 is open, the switching thyristor 60 is closed.

In the block 10 for accelerating the turn-on of the sectional switch 9 (Fig. 3), two storage capacitors 59 and 73 are provided for accelerating the turn-on of the switch with an electromagnetic drive with a consumption current of 15 to 70 A. The switching thyristor 60 and the additional thyristor 77 are closed due to open contact 72 relay 51 (figure 1).

In the event of a power loss, for example, by the first section of the substation's 7 buses due to short-circuit or erroneous (spontaneous) tripping of a switch in the power supply circuit of this section, a three-phase undervoltage relay 21 (U <0.8U _n ) or a start angle monitoring unit 19 (angle between the same the voltage vectors of the bus sections 7 and 8 - δ> 10 °), which leads to the operation of the logic element 2 OR 29 and the output of the level signal "1" to the second input of the logic element 2I 35. Since there is no accident in the power circuit of the second section of buses 8, then at the output of a three-phase relay of minimum voltage tension 22, the starting block for controlling the angle 20 and the logic element 2 OR 30, the signal is equal to level "0". At the output of the inhibit element 39 and at the first input of the logic element 2I 35, the signal is "1", which leads to the operation of the logic element 2I 35, and the signal of the level "1" appears at the third input of the logic element 3I 43. Due to an accident in the power circuit of the first section of buses 7, the direction of active power changes from consumers to the power source, which leads to the return of the relay of the direction of active power 17 and the output signal level "1". The same signal is supplied to the second input of logic element 3I 43. Due to the fact that the input switches 3 and 4 are turned on, and the section switch 9 is turned off and the relay protection circuit of the inputs does not work, then the output is PROHIBITED 47 and at the first input of the logical element 3I 43 the signal is equal to "1". Thus, at all three inputs of logic element 3I 43 there is a signal of level "1", which leads to the triggering of the last and the output of a signal of level "1" to the first input of logic element 2I 37. At the second input of logic element 2I 37 there is also a level signal "1" from the block 41 shutter speed of the inhibit signal due to the lack of operating conditions of the logic element 2I-NOT 33, since the voltage at the second input is at the operating level (U> 0.9-0.95U _n ). Logic element 2I 37 generates a signal of level "1" to the actuating relay 49 and to the first input of logic element 2 OR 31, therefore, to the second input of logic element 3I 45.

The actuating relay 49, when closed, closes the contact 70 (Fig. 2), which leads to the operation of the relay 62, opening of the contact 63 and closing of the contact 64. In this case, the voltage from the capacitor 65 is discharged to the control electrode of the switching thyristor 60, which leads to the opening of the latter and a voltage discharge of 950 V from the storage capacitor to the shutdown electromagnet of the input switch 3. Such a forced supply of an increased DC voltage of 950 V to the shutdown electromagnet leads to accelerated magnetization of the magnetic system, and the response time of the shutdown electromagnet is reduced by 2-3 times. In this case, the intrinsic shutdown time of an input, for example, a vacuum circuit breaker can be from 0.022 to 0.025 s. The accelerated shutdown of the input switch 3 leads to the quick closure of the block contact, to the removal of the inhibitory signal of level "0" from the block FORBID 49 and the output of the signal level "1" to the first input of logic element 3I 45. At the same time, the third input of logic element 3I 45 is present the signal of level "1" from the delay element of signal 42, since at the output of the blocking unit 34 for monitoring the angle between the voltage vectors of the first and second bus sections, the signal is "1" due to the absence of operating conditions, i.e. the angle δ is less than 60-80 °. Logic element 3I 45 is triggered and gives a signal of level "1" to the executive relay 51. This leads to the closure of terminal 72 (Fig. 3) and the triggering of the elements of the opening circuit of the switching thyristor 60. The thyristor 60, when opened, discharges a DC voltage of 950 V from two storage capacitors 59 and 73 to the electromagnet switching on the sectional switch 9. The energy of these capacitors allows you to quickly magnetize the magnetic system of the electromagnetic drive, but this energy is not enough to fully turn on the sectional switch. Additional energy to turn on the sectional switch comes from a DC or rectified 220 V distribution substation network. After the switch is turned on to close the switching thyristor 60 in the section block acceleration accelerator 10, a signal is generated to open an additional thyristor 77 through a zener diode 81, a diode 80 and a resistor 79. Opening this thyristor allows you to discharge the reverse voltage from the capacitor 76 through the switching thyristor 60, which leads to its closure. Tests have shown that such a forced-on circuit, for example, of vacuum circuit breakers with electromagnetic drives, reduces its own switching-on time to 0.023-0.028 s. In this case, the speed of the main contacts of the vacuum circuit breakers remain within the limits specified by the technical conditions.

The time of fixing the power loss, for example, of the first section of buses 7 is the sum of the response time of the three-phase undervoltage relay 21 (0.015 s) or the response time of the start-up block 19 of the angle control (δ> δ _back = 10 °) between the same voltage vectors of the first and second section of tires (0.02 s), the time of the signal output by the delay element 25 (0.005 s), the response time of the logic elements in the signal path and the executive relay 49 (0.002 s) is 0.022-0.027 s. The opening time of the inlet vacuum circuit breaker 3 with the shutdown acceleration unit 5 is 0.022-0.025 s, and the turn-on time of the sectional vacuum switch 9 with the acceleration block of the inclusion is 10-0.023-0.028 s.

Thus, the total time of a power outage during operation of the proposed device BAVR is 0,067-0,08 s, which is less than the time of operation of all existing devices ABP and BAVR.

In the event of a short circuit on the outgoing lines or on the busbars of the substation of the first bus section 7, the direct power active direction unit ΔP of direct sequence 17 is in a blocking state and the signal at the output of this block is "0". Therefore, the signal of level “1” from the three-phase undervoltage relay 21, logic element 2 OR 29 and logic element 2I 35 does not pass through logic element 3I 43 and therefore all subsequent logic elements 2I 37, 3I 45 and actuating relay 49 and 51 do not work. With short circuit in such places, the standard relay protection circuit of the outgoing line switch or the relay protection circuit of the input switch 3 without the operation of BAVR devices is triggered.

When a ring is formed on the side of 10-35-110 kV due to the peculiarities of the network operating mode or due to repair work and in the event of a short circuit in these networks, the voltage on the first and second bus sections decreases simultaneously. In this case, three-phase minimum voltage relays 21 and 22 are triggered and, at the output of these relays, therefore, level 1 signals appear at the input of delay elements 25 and 26 and at the first and second inputs of logic element 2I-NOT 33. The delay elements of the signal 25 and 26 do not allow level 1 signals to pass through the 2 OR 29 logic element for 0.005 s. The logic element 2I-NOT 33 has an output signal of level "0" at the output, which starts the blocking mode 41 of the inhibitory signal blocking mode signal level "0" at the second inputs of logic elements 2OR 37 and 38 for 30-180 minutes.

When the voltage is automatically restored to its normal operating level (U> 0.9-0.95U _n ), on both inputs, before the expiration of 30-180 minutes, two-phase maximum voltage relays 23 and 24 are triggered and provide a level signal to the inputs of the delay elements 28 and 29 "one". The latter delays the signal of level "1" for 10-15 seconds (guaranteed time of operation of all relay protection devices, automatic reclosure and automatic transfer switch in the power supply circuit of the substation) and then lead to the triggering of logic element 2I 32 and the output of level 1 signal to the second input of the unit 41 shutter speed excerpts. At the same time, this unit changes the signal of level "0" to the signal of level "1" at the second inputs of logic elements 2I 37 and 38 and, thus, removes the blocking of the operation of BAVR devices. Provided that the accident is saved in two or one input and after 30-180 minutes have passed, the inhibitory signal holding unit 41 blocks the operation of the BAVR device until this block is manually removed by operational personnel. At the time of blocking the operation of BAVR devices at the substation, a standard relay protection circuit and a standard ABP circuit are operating.

The angle blocking block 34 (δ _block ) is triggered when the angle diverges between the voltage vectors of the same name of the first 7 and second 8 bus sections of more than 60-80 °. Such a divergence of the angle (δ _block ) can occur when the circuit breaker is switched off in the power supply circuit by one input and after an emergency delay in opening the input switch 3 or 4. The angle blocking block 34 (δ _block ) due to the level signal 0 "and delays by element 42 of this signal for 2-3 s blocks the operation of logic element 3I 45 at the third input, which eliminates the opposition of the section that has lost the power source to the backup when the voltage vectors diverge Vuh more sections 60-80 °.

If the operational voltage of 220 V at the inputs of the input acceleration block 5 and 6 (3 and 4) and the block acceleration accelerator 10 of the section switch 9 disappear, the voltage divider 57 and 58 are connected between two rectifier diodes 55 and 56 and the presence of a separation diode 61 in the charging capacitor circuit allows a long time (up to 30 minutes) to maintain voltage in the storage capacitors 59 (59 and 74) in the smoothing capacitor 68 in the power supply circuit of the relay 62 and in the charging capacitor 65 to generate a signal for opening a switching dash torus 60. The presence of a second isolation diode 71 in the circuit of the electromagnet turning off the input circuit breakers and a fifth isolation diode 82 in the circuit of the electromagnet turning on the sectional circuit breaker allows you to apply blocks 5 and 6 to accelerate the shutdown of the input circuit breakers 3 and 4 and the block 10 accelerating the inclusion of the sectional switch 9 parallel to the existing factory control without additional changes, which significantly increases the reliability of these switches.

Thus, improving the reliability and speed of operation of devices BAVR is achieved by:

1) monitoring the simultaneous reduction of voltage and blocking the operation of BAVR devices for the period of eliminating the accident using the blocking time delay unit of the inhibit signal and the automatic restoration of the operation of BAVR devices due to the control of voltage recovery in the power supply circuit of sections of substation buses using the maximum voltage relay;

2) supplying increased voltage from pre-charged capacitors to the electromagnets for disconnecting the input switches;

3) the simultaneous supply of increased voltage from pre-charged capacitors and constant voltage from the network to the electromagnet turning on the sectional switch.

Information sources

1. Nudelman G.S., Fedorov E.K. The block of the starting device for automatic inclusion of the reserve. - Electrical stations, 1993, No. 2.

2. USSR Copyright Certificate No. 1670741, cl. H 02 9/06 - analogue.

Claims (3)

1. A device for high-speed automatic turning on of the reserve, containing the main and backup power sources, input switches with acceleration shutdown units, the first and second sections of substation buses, a section switch having an acceleration unit for turning on, the first and second direct power active direction direction blocks, the first inputs of which connected to the corresponding current transformers of the main and backup power sources, the second inputs to the corresponding voltage transformers of the first and second sections of buses, the third inputs are cross-connected to voltage transformers of the second and first sections of buses, the first and second starting blocks for controlling the angle between the same voltage vectors of the first and second sections of buses, connected to the corresponding voltage transformers of the first and second sections of buses, and the outputs connected to the first inputs respectively, of the first and second logical elements 2 OR, three-phase undervoltage relays of the first and second bus sections, the inputs of which are connected to the secondary windings of the corresponding voltage transformers of the first and second bus sections, and the outputs are connected to the inputs of the first and second signal delay elements, respectively, the outputs of the latter are connected to the second inputs of the first and second logical elements 2 OR, respectively, the outputs connected to the second inputs of the first and second logical elements 2 AND, the first inputs the latter are connected to the outputs, respectively, of the first and second FORBID elements, the inputs of which are cross-connected with the second inputs of the first and second logic elements 2I, outputs the first and second logic elements 2I are connected to the third inputs of the first and second logical elements 3I, respectively, the second inputs of the latter are connected to the outputs of the first and second active power direction blocks of the first and second bus sections, respectively, the first inputs of the first and second logical elements 3I are connected to the outputs respectively, the first and second blocks are FORBIDDEN of the first and second bus sections, characterized in that the outputs of the first and second logic elements 3I are connected to the first inputs of the third and the fourth logical elements 2I of the first and second bus sections, the second inputs of which are connected to the output of the shutter speed shutter block, the first input of which is connected to the output of the logical element 2I-NOT, and the second input is connected to the output of the fifth logical element 2I, the output of the third logical element 2I is connected with the first actuating relay of the first bus section and with the first input of the third logic circuit 2 OR, the output of the fourth logic element 2I is connected to the second actuating relay of the second bus section and with the second input of the third loop 2 OR logic outputs, the outputs of the first and second actuating relays are connected to the input acceleration block of the input switch of the first and second bus sections, respectively, the output of the third OR gate 2 is connected to the second input of the third logic element 3 AND, the first input of which is connected to the output of the third block FORBID, and the third the input is connected to the output of the third signal delay element, the input of which is connected to the output of the blocking block for controlling the angle, the first input of which is connected to the voltage transformer of the second section busbars, and the second input is with a voltage transformer of the first bus section, the output of the third logical element 3I is connected to the input of the third actuating relay, the output of which is connected to the acceleration unit for turning on the section switch, the first input of the logic element 2I-NOT connected to the output of the three-phase undervoltage relay the first bus section, and the second input is connected to the output of the three-phase undervoltage relay of the second bus section, the first input of the fifth logic element 2I is connected to the output of the fourth delay element the signal, and the second input is connected to the output of the fifth signal delay element, the input of the fourth signal delay element is connected to the output of the first two-phase maximum voltage relay of the first bus section, and the input of the fifth signal delay element is connected to the output of the second two-phase maximum voltage relay of the second bus section, inputs of the first and a second two-phase maximum voltage relay connected to the respective voltage transformers of the main and backup power sources. 2. The device according to claim 1, characterized in that the opening switch-off acceleration unit consists of a step-up transformer, to the first output of the first secondary winding of which a charging resistor, two rectifier diodes, a first output of the storage capacitor, a switching thyristor, a resistor between the control electrode are connected in series and the cathode of the switching thyristor, a reverse diode connected by the cathode to the cathode of the switching thyristor, and the anode to the second terminal of the storage capacitor and to the second terminal the first secondary winding of the transformer, the terminals of the second secondary winding of the transformer are connected to the rectifier diode bridge, the plus of the rectifier diode bridge is connected to the first terminal of the smoothing capacitor and to the first terminal of the control relay, the second terminal of which is connected through the make contact of the executive relay of the first or second bus section with the second terminal of the smoothing capacitor, with the second terminal of the charging capacitor, a voltage divider and with the "minus" of the rectifier diode bridge, while The voltage separator is made on the basis of two resistors and is connected on the one hand between two rectifier diodes of the first secondary winding of the transformer, and on the other hand, to the minus of the rectifier diode bridge, from a diode whose anode is connected between two resistors of the voltage divider, and the cathode with the first the output of the NC contact of the control relay, the second terminal of the NC contact is connected to the first terminal of the charging capacitor and the first terminal of the NC of the control relay, the second terminal of the NC connected through the first limiting resistor to the control electrode of the switching thyristor, the second limiting resistor is connected to the control electrode and the cathode of the switching thyristor, and the cathode of the switching thyristor and the cathode of the inverse diode are connected to the first terminal of the shutdown input magnet of the first and second bus sections and to the cathode of the second isolation diode the anode of which is connected to the first terminal of the factory control circuit of the input switch of the first and second bus sections, the second terminal lektromagnita connected to the anode off-wheeling diode and the second terminal serial input switch control circuit of the first and second bus sections. 3. The device according to claim 1 or 2, characterized in that the unit for accelerating the turn-on of the sectional switch consists of a unit for accelerating the shutdown of the input switch, an additional storage capacitor connected in parallel to the storage capacitor of the unit for accelerating the shutdown, a third isolation diode connected by an anode to the storage capacitors and the cathode to the switching thyristor, the fourth isolation diode connected by the cathode to the switching thyristor, and the anode to the "plus" of the power supply direct or rectified voltage, an additional capacitor for overcharging the voltage connected by one output to the cathode of the switching thyristor, and the second terminal to the cathode of the additional thyristor, the anode of which is connected to the "plus" of the DC or rectified voltage power supply, and the control electrode of the additional thyristor is connected through an additional a resistor, an additional diode and a zener diode to the cathode of the switching thyristor, a second charging resistor for recharging the additional condensate a connected to one cathode of an additional thyristor, and a second output to an anode of a reverse diode, and the cathode of a switching thyristor and a cathode of a reverse diode are connected to the first output of an electromagnet to turn on a sectional switch and to the cathode of a fifth isolation diode, the anode of which is connected to the first output of the factory circuit control sectional switch, and the second output of the solenoid is connected to the anode of the reverse diode and to the second output of the factory control circuit of the sectional switch.

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