SU826500A1 - Method and device for switching-on stand-by electric power source for users - Google Patents

Description

(54) METHOD FOR INCLUDING A POWER SUPPLY OF CONSUMERS AND A DEVICE FOR ITS IMPLEMENTATION

There is also known a method of switching on a backup power supply in the system of a working transformer - a backup transformer - a power section, in the composition of which there is a rotating electric drive, according to which hundreds of the backup transformer flow to the power supply section of the working transformer 2.

Thus, the uninterrupted uninterrupted power supply of consumers of the reserved section is ensured, which increases the reliability of power supply to the main part of these consumers.

However, the moment of connection of the section with the network of the backup transformer may coincide with the time when their voltages are out of phase, as a result, there is a transient process of connecting the motors of the redundant power section, accompanied by a sharp decrease in the quality of the voltage at other terminals of the consumers characterized by deep dips like wives These voltage dips, in terms of their effect on a number of section consumers (electronic equipment), are adequate to interrupt power supply; in addition, the duration of low quality voltage recovery on the power supply section to a steady state level can reach significant values that can exceed ten seconds, which in itself is unacceptable for a certain number of consumers (for example, electronic equipment). Moreover, the main part of the voltage drop during the transition process. The motor connection is due to the internal impeance of the backup transformer.

In the general case, the reservation can be carried out according to the principle of an implicit reserve, when a section of consumers connected to the standby transformer is connected in the backup transformer network in the backup transformer network. In this case, the disadvantages of this method also apply to consumers of the power section of the backup transformer.

It is also known a device dp of the present method, which contains a working transformer, CONNECTED to the power supply network of the working source of eggegeneracia and connected to a redundant power section, a standby transformer connected to the power supply of the backup source of electric energy

connected to the backup section, including the device, connecting both sections, the consumers being connected to the sections through switches.

The disadvantage of this device is the inability to compensate for voltage dips in the modes of group connection of powerful engines, which reduces the reliability of power supply

consumers sensitive to the quality of the supply voltage.

The closest solution to the technical problem is the method of switching on the backup power supply in the system.

5 three power transformers - consumer sections, according to which the transformers are supplied from independent sources of electricity, and in the event of a power failure in the network, one of the two

0 (working) power transformers, the third network is connected to a redundant section, and if there is a synchronous load, equipment is used that prevents asynchronous switching on f J5 However, this method is characterized by the presence of an interruption in the power supply to consumers of a specified quality and, moreover, when there is a powerful asynchronous load in the composition of consumers, deep voltage dips occur at the terminals of all sweats rebates of the pita5 VIA section for group self-starting, especially in autonomous power systems, where the power of the power supply elements (transformers) is comparable with the power of consumers. The sharp

0 reducing the quality of electricity reduces the reliability of power supply to such critical consumers as electronic equipment, high-speed elements of radio engineering and automation,

five "

In this case, the main part of the voltage drop during the transient process of switching on the load falls on the internal resistance of the back-up supply transformer.

Claims (3)

The closest solution to the same problem is a device for implementing the method comprising a redundant consumer section connected to a working network via a first transformer, a second transformer connected to a backup network and connected to a consumer backup section, a third transformer, G1OG1kpuche 1y to the backup network, turnips time, connected with the physical output of the control organ, including the apparatus, commissioning between the reserved and reserved sections of the Gz. The disadvantage of this device is the inability to compensate for voltage dips in the rpynrtOBoro modes of self-starting by powerful consumers, which reduces the reliability of the power supply of consumers sensitive to the quality of the supply voltage. The purpose of the invention is to increase the reliability and quality of the voltage supply of consumers by reducing the influence of the currents of the group connection of powerful consumers of the reserved section. The goal is achieved by the fact that in the method of switching on the backup sne of the system in a system consisting of three transformers, the first and second of which are intended for connection to the main and backup networks and connected respectively to the first and second sections interconnected. device, and a third transformer, intended for connection to a backup network, according to which in emergency modes of power supply failure in the network of the first transformer, the first power section is connected to volts a section swarm and disconnect from the first transformer, measure the current in the section connecting circuit between themselves and, when this current appears, consumers critical to the quality of electricity disconnect from the power section and connect them to the third transformer, after which transient turn-on time sec; 1, connect them to the second transformer and disconnect from the third transformer. In addition, in the backup power supply method, the standby network supplies voltage from one independent source of electricity. In a device for implementing the method comprising three transformers, the first and second of which are intended for dp connections to the main and backup networks and are connected respectively to the first and second sections m, interconnected by a sectioning switching-on apparatus, and a third transformer, designed to be connected to a backup network, a time relay connected to one OUTPUT of the control, switches of consumers, a current sensor is introduced, two high-speed switching devices, the current sensor is installed in the connection circuit of the first and second sections and connected to a control element, to the second output of which the control inputs of high-speed switching devices connected between the secondary winding of the third transformer and the breaker inputs for connecting consumers that are critical to the quality of the electric power, the control inputs of these terminals The tepees are connected to the third input of the control unit through the second time release switch. In addition, in the device DP implementation of the method, the primary windings of the second and third transformers are interconnected. The proposed method of switching on the backup power supply consists in that the input voltage of the alternating current source is supplied to the input of the first transformer and the voltage of the backup networks to the inputs of the second and third transformers. In this case, backup networks are supplied with voltage from one or two independent autonomous sources. In the event of a power failure in the network of the first transformer, the output network of the second transformer is connected to the reserved first power section of the consumers, and the first transformer is disconnected from the first power section. In the connection circuit of the redundant power supply section and the output network of the second transformer, the current is measured at its occurrence, consumers critical to the voltage and duration of their cobalt are disconnected from the power sections and connected to the third auxiliary transformer, with a hold time produced I1 connection to the second transformer disconnection from the third transformer. The drawing shows a diagram of the arrangement for carrying out the proposed manual. The device consists of a first slave transformer 1, a connected network 2 of a working electrical source and connected to a redundant first power section 3, consisting of powerful rotating tweeters 4, a second standby transformer 5, connected to the network 6 of a backup source of electrical energy and connected to a redundant second section 7, of a sectional enabling apparatus 8 with a control box 9, connecting power sections 3 and 7, a current sensor 10 installed successively with the device 8, a control unit 11, which is Expensively connected to the output of sensor 10, a turnip 12 of time connected to one of the extrusions of the control organ 11, two fast-acting devices 13 and 14, the control inputs of which are connected to the second output of the control 11 of the control time 15 and 15 of the third auxiliary transformer 16 connected to the network 6 backup source of power supply and connected to the input terminals of consumers 17 and 18, critical to the quality of voltage, through switching devices 13 and 14, and the control inputs of the switches 1 9 and 20 of these consumers, connecting the IR with sections 3 and 7, are connected to the third output of the control body 11 via the disconnecting contact 21 of the time relay 12. The remaining consumers of sections 3 and 7, as well as the power supply elements are connected through switches 22 The device operates as follows. In normal mode, consumers 4 and 17 of section 3 receive electricity from the mains 2 of the working source through the working transformer 1. Consumers of section 7 receive power from the network 6 of the backup source of electropower through the backup transformer 5. When they leave the building power supply in the network of the working source-electricity , the control circuit 9 generates a signal for the closure of the switching-on device 8. When a current appears in the circuit of the power supply sections 3 and 7, a control voltage appears at the output of the control element, resulting in The quick-acting devices 13 and 14 are on and off switches 19 and 20, connecting consumers 17 and 18, which are critical to voltage quality, with power sections 3 and 7. At the same time, time relay 12 is started and with time delay it opens its contacts: first 21, then 15, as a result, switches 19 and 20 are closed, and then devices 13 and 14 are opened, connecting the switches 17 and 18 back to the corresponding sections m 3 and 7 meals. Thus, consumers 17 and 18 switching modes are supplied with electric power with voltage quality close to steady-state values, without being affected by the transition process of switching the rotary motors of section 3 to the back-up transformer network, which increases the reliability of the power supply power supply. This is achieved by the fact that consumers, critical to the quality of electricity, during voltage recovery, are powered from a separate transformer, at the output of which the voltage dips when connecting a redundant section is less than that of the backup transformer, which is affected by the main voltage loss in the current line connected engines. Since the auxiliary transformer carries the load tol ;, to during the time of the transition process the sections are turned on, i.e. no more than a fraction of a minute, its elements can be selected without taking into account the heating in the long Harpv3 mode, which ensures high technical and economic performance. The use of control for switching time relays makes the circuit simple and reliable, and the use of high-speed switching devices allows for virtually uninterrupted power supply to consumers of the power sections. The use of the proposed method and device ensures uninterrupted operation of consumers that are critical to the quality of the voltage and the duration of its reduction without r-use for these purposes of energy storage units (flywheels, batteries). Claim 1. The method of switching on the backup power supply of the rebels in the system consisting of track transformers, the first and second of which are intended for connection to the main and backup networks and are connected respectively to the first and second sections, SUDD is a valuable partitioning switchboard between them. device and the third tras (Lormor, most suitable up to the backup network, which in emergency conditions violates the power supply of the first transformer, the first power section is connected to The second section is disconnected from the first transformer, characterized in that, with a chain of reliability and quality of the electrical supply of consumers, by reducing the effect of group currents of powerful consumers, the current in the circuit of each other is measured, and when this current appears, the users disconnect that are critical to the quality of electricity, from the power section and connect them to the third transformer, then with a time delay determined by the time of the transient switching on of the sections, connect the IR to the second transformer and disconnected from the third transformer. 2. A method according to claim 1, characterized in that the backup networks are supplied with voltage from one independent source of electrical energy. 3. The device dp implementation of the method according to claim 1, containing three transformers, the first and second of which are designed to be connected to the main and backup networks and connected respectively to the first and second sections interconnected by a sectioning device, and a third transformer intended for connection to the back-up network, turnip time, connected to one output of the control, consumer switches, characterized in that it includes a current sensor, two high-speed switching devices, and a current sensor connected to the first and second sections of the circuit and connected to the governing body, to the second output of which the control inputs of the high-speed switching devices connected between the secondary winding of the third transformer and the breaker inputs connected to the consumers are connected to the second output of the relay power quality, the control inputs of these switches are connected to the third input of the control unit through a second time-out break contact. 4. A device for implementing the method according to claim 2, distinguished by the fact that the primary windings of the second and third transformers are interconnected. Sources of information taken into account prn examination 1.Electrical networks and stations. Ed. L.N. Baptidanova. M.-L., Energia 1963, p. 337. 2. Electric stations, 1978, No. 9, p. 9. 3. Barzam A.B. System automation. M., Energie, 1973, p. 326-328.