RU1820443C - Method for automatic high-speed changing over to emergency power source of electrical installation - Google Patents

Abstract

Usage: the invention relates to emergency equipment for electrical installations, namely, relay protection devices and automation of electrical installations. Essence: when the voltage disappears in the electrical installation associated with the cancellation of the power supply line or short circuits in the electrical installation, the fact of an emergency voltage reduction and the presence of a short circuit in the electrical installation is detected, while the electrical installation is divided into bus equidistance levels according to class voltage from the voltage source and fixation of voltage reduction and the presence of damage at each level. In the event of an emergency voltage reduction at once at several levels, the backup source of busbars of the upper level with minimum delay time is turned on and the backup source of buses of a replaceable lower level with backup delay time is activated, in case of unsuccessful implementation of the fast switching on of the reserve source, and with a short circuit in the electrical installation prohibit the inclusion of a backup bus power supply and reserve, with a minimum time delay, the adjacent lower level buses. 4 ill. ate with

Description

with ke oh

The invention relates to the field of electric power industry, and in particular to means of emergency automation of electrical installations.

The aim of the invention is to increase the reliability and uninterrupted power supply to consumers by selecting and speeding up the backup power supply.

Figure 1 shows a schematic diagram of the electrical principle power supply of an industrial facility (electrical installation diagram); figure 2 - electric circuit

the principle of common logic circuits of high-speed automatic switching on of the backup power supply of an electrical installation; Fig. 3 is a schematic diagram of an electrical circuit principle of a priority (priority) organ for automatically inputting backup power levels; Fig. 4 is a schematic diagram of an electrical circuit diagram of a selector for selecting a backup power source for a given level.

The invention is exemplified by the installation of a district boiler house as follows. Wiring diagram

with

(Fig. 1) includes three supply lines 1 (two operating and one redundant), three sections of the busbars kV (two operating and one redundant), switches 5 at the inputs of 10 kV, switches

9 from the standby power source

10 kV, switches 6 inputs 6 kV, switches 10 on the side of the backup source b kV, switches 8 consumers 0.4 and 6 kV, switching devices (automatic machines) 7 on the inputs 0.4 kV, automatic machines 11 on the side of the backup power source 0, 4 kV, buses 6 kV-3 and 0.4 kV - 4, voltage control elements on 10 kV buses - 12, on 6 kV buses - 13, on 0.4 kV buses - 14, emergency reduction control (disappearance) voltages at levels: 10 kV - 15. 6 kV - 16,. 0.4 kV - 17, organs of damage at the connections: 10 kV - 40, 6 kV. -42, 0.4 kV -44, organs of damage fixation at levels: 10 kV - 41, 6 kV - 43, 0 , 4 kV - 45, In Fig. 2, the disconnecting contacts of the 12.13 and 14 voltage control elements on the buses of different levels include the voltage control elements of the levels-15, 16 and 17 (closing contacts).,.

The closing contacts of these bodies 18, 19 and 20 include a time relay for automatically switching on the backup power supply: the main -21 and backup-22 shutter speeds. - The time-closing contacts 23 and 24 of these relays turn on the relay. repeaters 25 and 26. In FIG. 3 presents contacts 27; 28; 29; thirty; 31 voltage controls at levels 15 ,. 16 and 17, respectively. Relays 32, 33, and 34 determine the appropriate level: 1.0, 6, or 0.4 kV. In FIG. 4 shows a make contact

35 first level select relay 32, contacts

36 and 38 relay repeaters 25 and 26 time delay, contacts 46 and 47 bodies, control 41 the presence of damage in the electrical installation. ke at levels 1, 37, and 39 are intermediate relays for selecting a backup source. at their own and adjacent lower levels, respectively. . ..- ...

The circuit that implements the proposed one works. method (the invention is as follows, In normal operation. the electrical installation has a working and standby line 10 kV, two working and standby bus sections TO kV - 2, two bus sections 6 3 and two

..- bus sections 0.4 kV - 4 are under voltage. Switches of inputs 10 kV - 5, inputs 6 kV - 6, inputs 0.4 kV - 7 and operating mechanisms - 8 are included. The circuit breakers for the 10 kV - 9, 6 kV - 10 and 0.4 kV - 11 power supplies are off.

When the voltage disappears, for example, due to the extinction of the supply lines of the TO kV 1. supply line, the undervoltage relay 12, 13 and 14 are activated

working sections 10, 6 and 0.4 kV. Relays for undervoltage of busbar sections of one

voltage classes (of one level) include voltage control relays for reducing voltage levels of 15.16 and 17, respectively: 1, 2 and 3 rd (10, 6 and 0.4 kV, see Fig. 2). Relays 15, 16 and 17 with their closing contacts 18, 19 and 20 include two timers for automatically switching on the backup power supply: the main 21 and backup 22 shutter speeds, which with their closing contacts 23, 24 include the relay of multiplication of contacts 25 and 26. Relays for monitoring the level voltage 1, 2 and 3 - 15, 16 and 17 with their contacts. 27. 28, 29, 30 and 31 assemble a priority selection circuit for the reserved voltage level (FIG. 3) by intermediate relays 32, 33 and 34, respectively. Since the voltage disappeared at all three levels, then contacts 27 and 28 of the first level relay 15 will cause the output relay 32 to trip and the relay 33 and 34 of the second and third levels to trip.

Level 32 selection relay

terminal 35 includes a pattern of the evolving authority, the choice of a backup source (see

figure 4). Time delayed (e.g. 0.5

c) through 25, by its contacts 36, it will assemble a relay circuit 37 to turn off the switch 5 of the main source (not shown) and turn on the switch 9. backup bus power 10 kV 2. If the turn-on was unsuccessful (for various reasons, for example,

failure of the backup switch 9), then, with a stand-by time delay (for example, 1.0 s), the time relay 22, by its contact 24, turns on the switch 26 (Fig. 2), which, by contact 38, turns on the relay 39 for disconnecting the switch 6 of the main source (not shown ) and turning on the switch 10 of the backup power supply of buses of the adjacent (lower) level (6 kV) with a standby time delay.

If the disappearance of the voltage is associated with a short circuit (short circuit), for example

on the first busbar section 10 kV 2, - addition to the described on the input switch

5 of the first section of tires 2, the relay relay will operate. Protection 40 and the general relay for monitoring the presence of damage at the first level 41 will turn on (see Fig. 1). Relay 41 trips, opens contact 46 and closes contact 47 in the circuit

the express authority to select a backup

source (figure 4). Moreover, with a minimum

time delay relay 39 and

adjacent buses 3 (6 kV) are reserved, and on

10 kV damaged bus redundancy

2, a ban is applied by the trip contact 46.

The circuit works similarly in case of damage at the levels of 6 and 0.4 kV, and not only buses, but also operating mechanisms can be reserved.

The positive effect of the implementation of the invention, which consists in increasing the reliability and uninterrupted power supply to consumers, is achieved by selecting and accelerating the inclusion of a backup power source during interruptions in power supply, as well as in the event of damage to electrical installations.

Claims (1)

SUMMARY OF THE INVENTION A method for automatically quickly turning on the backup power supply of an electrical installation containing several levels of equidistant busbars from a power supply according to the voltage class, which consists in monitoring the presence of voltage and short circuits in the electrical installation and automatically turning on the backup source, characterized in that, in order to increase reliability and uninterrupted power supply to consumers by selecting and accelerating the inclusion of a backup source, the electrical installation is divided into levels p vnoudalennoe ™ tires from the power source voltage class, when the emergency lowering voltage on several priority levels set and carry out a fast automatic back-up power supply of tires of the highest level with a minimum delay time and automatically turn on the back-up casting of tires of the adjacent lower level with standby time in case of unsuccessful high-speed automatic switching on of the reserve, and in case of a short circuit in the electrical installation, the automatic re-energization of the level at which the short circuit occurred is prohibited and the backup source with a minimum time delay on the buses of the adjacent lower level is turned on. RICE g and / t 4. 26