SU570144A2 - Emergency device for protecting powder aggregate from short circuiting - Google Patents

Description

one

 Basically auth.St. 550715 described device to protect the electrical unit from short circuit (SC). This device contains a fuse included in the power supply circuit of the electrical unit; a fuse inserted into the metallization circuit of the protected electrical unit, the installation of which is an order of magnitude smaller than the installation of the operation of the main fuse; a diode installed in the metallization circuit between the housing and the fuse; alarm elements and a power relay winding connected in parallel between the positive supply bus through the start switch, the alarm element being connected to the start switch through the closing contact of the actuating relay, the winding of which is connected to the positive bus at one end through the specified start switch and the other end connected through the second diode to the junction point of the cathode of the first diode and an additional fuse.

However, such a device, protecting the electrical unit from short-circuit during a hot contact and issuing the operator automatically information about the electrical breakdown of the electrical unit (its emergency operating mode), does not provide automatic emergency operation of the unit, but is controlled by the operator, which can lead to complications from - due to an operator’s error, when it is necessary to strictly limit the emergency operation of the electrical unit.

The purpose of the invention is to increase the reliability of the device by automatically limiting the time of emergency operation of the electrical unit.

It is achieved by the fact that the device on the author.St. M 550715 additionally introduced a three-position switch and a time relay, with the three-position switch connected to the power relay coil, one extreme scrambled directly to the ground and the other extreme terminal to the earth through the open time relay contacts, the winding of which is connected in parallel to the winding of the actuating relay.

The drawing is a structural diagram of the proposed device.

The protected electrical unit 1 consists of a metallized case 2, electrical insulation 3 of the housing 2 from the current-carrying part of the electrical unit, electrical insulation 5 of the electrical unit from the mass 6. The current-carrying part of the electrical unit is connected to the positive bus 7, through the means 8 aaaiHiH {gas station, AZR or smooth insert) and the generator. the contacts of the power relay 9 by the circuit 10. The current-carrying part 4 of the electrical unit is connected to Mass depy 10, Signal, board 12 The unit under load is connected to ground by circuit 13, and bus 7 .- through the closure contacts of relay 9 and protection means B. The winding of the power relay 9 is connected to the ground by a three-position switch 14 Dium circuits 15 and -16, B are filled with a number of 1 time contact relays 17, which can have a time from Q seconds to the right time. time, With a positive WINE 7 a & tHOYK power relay 9 connectors laren & 1% Through start switch 19, C Hrfiaji bT -oe YOLO 20 Breakdown of insulation soyoo With a mass of 21, and with positive Thai 7 through locking contacts The relay relay 22 and the start-up yk / yoChTel 19, the winding of the actuator 22 is connected and through BiffKjHOtiatenb 19 with a bus 7, and with a mass of b-tdeyi 23 through a diode 24, ko. torus connect ny-1gei with a chain of 25 metallization of the case-and Ele of the strouagregat at the point between the diodes Й and nd | With a 2-7 protection, the ci Ae-lifb SdrtHH installation is one by one less or less than the one installed; and the protection means, the winding of the 17th15th is connected in parallel to the o6Mutke Executive relay 22 points between the start-up BfcJKiJTKr aterteM 19 and diode 24. During normal operation of the device, the operator switches on the start-up 19 and track-positioning 14 ykLechateli, he sets the ya manual or automatic disconnection of the electrical unit in emergency mode, Tok from the bus 7 through the chain 18 enters the ovMotka relay 9 and Passing through it, hits 15% su. In the case of the operator's toggle toggle switch switches 14 to the position of the automatic shutdown of the circuit from the winding of the relay 9 to ground on the circuit 16 and the closed contacts of the time relay 17, which is under load after the operator switches on the start switch 19, the relay 9 trips and closes its closed contacts through which along circuit 10 and means of protection 8, the current falls on the current & part 4 of the electric unit 1 and board 21 The unit under load% which lights up, giving information about the work of the electric unit. Static electricity from housing 2 flows through the metallization circuit 25, diode 26 and means 27 of the Protection to earth 6. At this time, the current hits the winding of the relay 22, passes through it then through circuit 23, diode 24, means 27 of the protection hits the ground. Relay 22 is triggered, breaking its closure contacts and switching on the board 20 Electrical insulation breakdown, V.cc case When the current-carrying part 4 of the electrical unit is hot to its body 2, the current will increase by 1.1 + 1.3 nominal and protection 8 will not work . Through the short-circuit point, this current, passing through housing 2, enters the metallization circuit 25, passes through diode 26 through it, melts the protection means 27, thereby breaking the metallization circuit, the fault will be eliminated, the electrical unit 1 will be under load in emergency mode. Information about this. will be issued to the operator. table 20 Breakdown of the insulation and table 12 Unit under load, which will burn, because at the moment when the means 27 of the board is melted, i.e., break, circuit 23 connecting the winding of the relay 22 through diode 24 with weight, the winding will be de-energized, the closing contacts will be closed and the current through circuit 18 will go to the board 20, If the operator sets the toggle switch 14 to the position Manual shutdown, the operator must return the toggle switch to the Off position, break off after the preset emergency operation time m most circuit 9 and the power relay de-energized electric plant. - If the operator installs a toggle switch 14 to the position of automatic disconnection of the electrical unit after a predetermined time of its emergency operation (the setting of time relay 17 will be disconnected from the load by power relay 9, the circuit of which will be interrupted by closing contacts of time relay 17 installation of the relay from the beginning. KZ, t, e, when the following part of the time relay receives a signal by breaking the circuit 23 when the protection means 27 blows. A time relay whose contacts are making into a minus circuit of a power relay behind a three-position switch provides automatic shutdown with a predetermined time of an electrical unit operating in emergency mode. Such functionality of the proposed device will allow eliminating operational errors in limiting the electrical unit operation in emergency mode, which is quite important for a number of objects .

Claims (1)

Claims of Invention A device for protection of an electrical unit against short circuit according to the author. ev 550715, characterized in that, in order to increase the reliability of the device by providing the possibility of automatically limiting the emergency operation time of the electrical unit, a three-position switch and a time relay are additionally introduced, the three-position switch being connected to the central terminal by a winding power relay, one extreme terminal - directly from with a mass / and another terminal - with a mass through the razkvlkatsya contacts a time relay, the winding of which is connected - parallel to the winding of the executive, rel .