SU1249647A1 - Versions of high-voltage switch-gear - Google Patents

Abstract

This invention relates to electrical engineering and can be used in electrical distribution; high voltage devices. The aim of the invention is to increase the power supply efficiency, efficiency and expansion of functionality by 1 2 / / CHEC. In the case of a short hacking || short circuit at point 124 on the busbar section 3 and refusal to disconnect the sectional switch 9, the switches 10, 11 and 12 are disconnected. After this, the automatic circuit breaks off the separator 13 and switches off the automatic switching on of the switches 10 and 12 parallel operation of the busbar section 4 connections with the busbar sections 1 and 2 is resumed. With a stable short circuit on the working busbar section 3, 1.5 seconds after de-energization of the busbars, parallel high-voltage line 21 operation and transfer operation are restored 19 in the case of short circuits at connections 19 and 21, the relay protection of connections affects the switching off of the switch 11 and the switch of the opposite end of the line 21.2 sec. of the ffl, .2 ill. 3 (L

Description

The invention relates to electronic engineering, in particular to high voltage electrical distribution devices.

The purpose of the invention is to increase the reliability of the power supply to consumers, the economy and the expansion of the functional capabilities of the device.

FIG. I and 2 are variants of switchgear schemes ..

The device contains sections 1 and 2 of the first working system of tires, sections 3 4 of the second working system of tires, sections 5. and 6 of the bypass system of buses, section switches 7-10, inter-switch switches 11 and 12, partition separators 13-15, bypass separators 16 and 17, connection 18-25 to 1 and 3 sections of working connection systems 26-33 to 2 and 4 sections 14 of working systems of buses, connection 18-33 are connected to working systems of buses, respectively, through switches 34-49 and disconnectors 50- 81 and to the bus bypass system via separators 82-97, disconnectors 98-113 are enabled accordingly. but switched between studios and separator process fitting of each of the connections. Disconnectors 114-123 (Fig. 2) are connected respectively on both sides of the switches 7-P.

The device works as follows.

In the normal operation of the switchgear, bus connectors 1, 18, 20, 22 and 24 are connected through isolators 34, 36, 38 and 40 and disconnectors 50, 54, 58 and 62, bus connectors 2, 26, 28, 30 are connected to section 2 and 32 through switches 42, 44, 46 and 48 and disconnectors 66, 70, 74 and 78.

Connections 19, 21, 23 and 25 are connected to busbar section 3 via switches 35, 37, 39 and 41 and disconnectors 53, 57, 61 and 65.

Connections 27, 29, 31, and 33 are connected to busbar section 4 through switches 43, 45, 47, and 49 and disconnectors 69, 73, 77, and 81.

In the event of a short circuit (short-circuit) at point 124 on section 3 of the bus and the refusal to disconnect the sectional switch 9, the action of the backup device circuit in the event of a circuit breaker failure (breaker failure protection) switches off the switches 10-12. Upon the operation of the breaker failure circuit, there is no voltage on the bus section 3, the off position of the switches. 10-12, the automatic circuit breaks off the separator 13, after which the automatic reclosing (AR) of the switches 10 and 12 is allowed, which resumes the parallel operation of the busbar section 4 connections with the busbar sections 1 and 2.

With a stable short circuit at point 124 on section 3 and disconnection of all section switches from busbar protection, it is possible to use section 5 of the bus bypass system to transfer the power transformer 1 9 and one of the power lines to it, for example, 21. Dp from the protection of the tires of the switches 9, 35, 37, 39 and 41 by the action of the automatic circuit upon fixing the absence of voltage, sections 3 and 5 of the tires, fixing the open position of the switches 9, 35, 37, 39 and 41, disconnect the disconnector II and the sectional switch .. away rer 14 and a signal is sent to disable the switch attachment 21 at the opposite end. : By fixing the disconnected position of the separators 14, 15, 16, 83 and 85 and off of the 7 and 1 1 separator 85 is turned on and the absence of voltage is applied to section 5 of the bypass busbar system. The separators 83 and 16 are turned on, after which the switch 11 and the switch of the opposite end of the line 21 are turned on, the holding time of which recloses the automatic circuit breaker.

Automatic transfer of connections 19 and 21 to the 5 bus bypass system takes time equal to

dt 1.5 s, s — on-time from the splitter; c is the switch-on time of the switch; с - degree of selectivity.

Where

T from 01 0

H

t, 0.2 At 0.5

55

Thus, with a stable short circuit on the working section 3 of the tires, after 1.5 s after de-energizing the tires (after unsuccessful tire reclosing), parallel operation is restored on HV line 21 and the transformer 19 operates. In the case of short circuits at connections 19 and 21, the relay protection of connections works disconnecting the switch 11 and the switch of the opposite end of the line 21.

With short circuits at point 125 on transmission line 26 in the normal previous mode and failure to disconnect the switch 42, breakers 8, 44, 46 and 48 are disconnected from LEVER, circuit breaker 12 and separator 14 are disconnected, circuit breakers 66 and 106 Upon their disconnection and the absence of voltage on section 2, switches 44, 46 and 48 of connections 28, 30 and 32 and separators 17 and 90 are turned on. After fixing them on by the action of the automatic circuit, the inter-switch 12 turns on and supplies voltage to the disconnected line 26 If the short circuit does not resume, line remains in operation through the switch 12. If the damage on VL 26 is permanent, the switch 12 is disconnected from the protection.

FIG. Figure 2 shows a variant of the switchgear circuit with two workers, partitioned switches and a bus bypass system.

Just as in the diagram in FIG. 1, with a short circuit at point 124 on section 1 and a failure to disconnect the sectional switch 7, the second sectional switch 8 and the interloop switch 1I are turned off. After the automatic disconnection of the disconnectors 114 and 115, the automatic reclosing of busbars of section 1 and switches 8 and 11 is permitted. If the fault at point 124 is stable, if necessary, connections 18 and 24 are transferred to the bus bypass system. This includes the separators 16, 82 and 88, the switches 8 and 11, as well as the switches on the opposite side of the circuit, connections 18 and 24.

The by-wheel bus bypass system is not partitioned; in the repair mode, only one connection can be transferred to the busbar system. As bypass switches 7, 8 and 11 or all three can be used at the same time.

In the case of connection 26, switches 7, 8 and 11 are disconnected through the bus bypass system and a stable short circuit, the bypass separator 16 is turned off during a blank pause, after which the automatic recloser turns on switches 7, 8 and 11. If the short circuit breaker fails mi 7 or

5 10 5 0

five

about

,,

five

8, the section G or 2 is de-energized at the time of the automatic disconnection of the disconnectors II4 and 115 or 116 and 117. If circuit breaker II fails, circuit breakers 9 and 10 are also disconnected from the breaker failure circuit.

Since the breakdown rate of 110–220 kV transmission lines for two orders of magnitude in the breakdown of power transformers, the operation of the transformer 32 through the bus bypass system can be with the switches 7-11, i.e. as in the normal operating mode, and the operation of the overhead line 26 through the bus bypass system can be with switch 7 and 8 disconnected. In this case, switches 9 and 10 are disconnected at the fault at point 125 and the switch 11 fails.

Claims (2)

1. Switchgear of high voltage, containing two working bus systems, two sectional switches on the sectional chateau and bus bypass system, two inter-ear switches, disconnectors and connection switches in the form of power lines and transformers, in order to increase reliability, efficiency and expanding the functionality of the device, it additionally contains two sectional switches, one for each working bus system, two sectional separators for two-way - one for each working bus system, double-acting separator, partitioning the bus bypass system, two double-acting bypass separators, double-acting separators according to the number of connections to the working bus systems, the first and second sections of the first working bus system respectively connected to each other by series-connected two sectional switches and a sectional separator located between the two, the first and second mezzanine switches are connected respectively between The first and third, second and fourth sections of tires at the points of connection of sectional switches with sectional separators, the first and second bypass separators are connected respectively to the first and second sections of the bus bypass system and with the points of connection of the first sectionalizer the first working system of tires, each of the separators of the connections is connected to the section of the bypass system of tires and with the connection. . 2. Switchgear of high voltage, containing two working bus systems, two section switches on the section chateau and bus bypass system, bypass and between bus switches, disconnectors and circuit breakers in the form of power lines and transformers, in order to increase reliability, economy and increased functionality of the device, it 16 j th 21 yr gz 2t s additionally contains two sectional switches, an inter-circuit breaker, a bypass separator and separators according to the number of connections, the first and second sections of the first operating busbar system, and the third and fourth sections of the second busbar operating system are connected to each other by successively connected two sectional switches, an inter-terminal switch is connected to the first and second working bus systems at the points of connection of two series-connected section switches, a bypass connection separator It is connected with a bus bypass system and with a common connection point between two sectional and inter-ear switches, and each connection is connected to the bus bypass system with a separator. GB x S8 23 30 31 x 33 61 Compiled by K. Khoetsian Editor N. Tupitsa Tehred M. Khodanich Proofreader I. Erdeyi Order 4336/56 Edition 612 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4