RU2678189C1 - Device for current protection of electrical installations - Google Patents

Device for current protection of electrical installations Download PDF

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Publication number
RU2678189C1
RU2678189C1 RU2018100443A RU2018100443A RU2678189C1 RU 2678189 C1 RU2678189 C1 RU 2678189C1 RU 2018100443 A RU2018100443 A RU 2018100443A RU 2018100443 A RU2018100443 A RU 2018100443A RU 2678189 C1 RU2678189 C1 RU 2678189C1
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RU
Russia
Prior art keywords
connected
switchgear
reed switches
attached
lower base
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RU2018100443A
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Russian (ru)
Inventor
Константин Иванович Никитин
Марк Яковлевич Клецель
Бауыржан Ерболович Машрапов
Даурен Джамбулович Исабеков
Original Assignee
Федеральное государственное бюджетное образовательное учреждение высшего образования "Тюменский индустриальный университет" (ТИУ)
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Priority to RU2018100443A priority Critical patent/RU2678189C1/en
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Publication of RU2678189C1 publication Critical patent/RU2678189C1/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00Electromagnetic relays
    • H01H51/28Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

Abstract

FIELD: electrical equipment.
SUBSTANCE: field of application: electrical equipment. Device for current protection of electrical installations contains three units for mounting reed switches and regulating their response current, each of which contains a plate, on the outside of which six reed switches are fixed at different angles to the cross-section plane of the busbar. Outputs of the reed switches are connected to the timing body, to the output of which the executive body is connected, output of the executive body is connected to the circuit breaker tripping circuit, reed switch plate is attached to the central and side holders, central holder is attached to the toothed belt with the ability to move on it relative to the busbar, side holders are attached to the axles, at the same time, the ends of the running axles are attached to the first and second supporting posts fixed on the lower base of the bus compartment of the complete switchgear with the use of a fixing angle, screws and a bolted joint. Stepping motor with a first toothed pulley and clutch attached to it, as well as a winding mechanism, are fixed on the first support column; and on the second support stand a second gear pulley attached with a mounting plate, there is a toothed belt on the first and second gear pulleys, one of the contact cores of the reed switches is connected to the timing unit using the first connecting cable, which is fixed at one end on a plate with reed switches, laid through the air to the winding mechanism, from the winding mechanism through the first support rack to the lower base of the busbar compartment of the switchgear assembly, along the lower base of the busbar compartment of the switchgear assembly and into a plastic sleeve laid along the lower base and wall of the busbar compartment of the switchgear to the timing unit to which another is connected the end of the first connecting cable. Another contact core of reed switches is connected to the output of the circuit breaker with a plus sign using the first connecting cable, stepper motor using a second connecting cable connected to the control panel with a touch screen, second connecting cable is laid along the first support rack to the lower base of the busbar compartment of the switchgear assembly, along the lower base of the busbar compartment of the switchgear assembly and wound up in a plastic sleeve. First and second connecting cables, as well as the plastic sleeve, are attached to the supporting posts, the lower base and the wall of the switchgear compartment of the switchgear with plastic clamps, first and second inputs of the control panel are connected with wires to the outputs of the circuit breaker with the signs "plus" and "minus", respectively. One of the inputs of the executive body is connected with a wire to the output of the circuit breaker with a minus sign, inputs and outputs of the reed switch plate, the control panel, the timing unit and the executive body are sealed with rubber gaskets. Timing unit, the circuit breaker, the control panel, the executive body are located in the measurement and protection cabinet of the switchgear assembly.
EFFECT: ensuring remote and smooth movement of reed switches relative to the plane of busbars.
1 cl, 3 dwg

Description

The invention relates to electrical engineering, namely to relay protection technology and can be used as current protection of switchgear switchgear cells.

Known current protection of electrical installations on reed switches [SU 1086494, IPC Н02Н 3/08, publ. 04/15/1984] containing a plate with a reed switch, a graduated movable toothed rack with a sight, fastening units for said rack with a locking screw and plate.

The disadvantage of this device is that the movement of the reed switches relative to the axis of the conductive busbars in the plane of their section is not provided, and there is also no possibility of increasing the number of reed switches in order to expand the range of choice of settings for current protection.

Known current protection of electrical installations on reed switches [RU No. 2584548, Н02Н 3/08, publ. 05/20/2016], containing three blocks for mounting the reed switches and regulating their operating current, each of which contains a plate on the outer side of which six reed switches are fixed in two rows at different angles to the plane of the cross-section of the current-carrying bus and at the same distance from each other, a threaded rod on which a lamb is worn, one end of the rod is inserted into a hollow cylinder that is rigidly fixed to the bar so that the rod is perpendicular to it, and the bar is attached to the plate, which is attached to the roll-out carriage body and a complete switchgear, in this case two rails are attached to the bar parallel to the rod, on either side of it, on the outside of one of which a scale is applied, a plate is put on these rails through vertical slots in it perpendicular to the plane of the cross section of the busbar and with displacements along the rails relative to the busbar, the bar, rails and plate are made of fiberglass sheet, and the remaining structural elements of the device are made of dielectric material, g Rkoni all devices for attachment and adjustment are connected to the input of the timing unit, whose output is to the actuator body executive output is connected to the circuit breaker tripping.

The disadvantage of this device is the inability to remotely and smoothly control the distance from the reed switches to live busbars, because it is done manually and at the installation site of the device.

The technical problem of the invention is the remote and smooth movement of the reed switches relative to the plane of the current-carrying tires.

The solution to the technical problem is achieved due to the fact that the device for current protection of electrical installations, as in the prototype, contains three units for attaching the reed switches and regulating their operating current, each of which contains a plate on the outer side of which six reed switches are fixed at different angles to the plane of the cross-section of the current-carrying bus, the outputs of the reed switches are connected to a timing element, the output of which is connected to the actuator, the output of the actuator is connected to the off circuit body.

According to the invention, a plate with reed switches is attached to the central and side holders, the central holder is attached to the toothed belt, with the possibility of movement along it relative to the current-carrying bus, the side holders are attached to the running axles. The ends of the axles are attached to the first and second supporting racks, mounted on the lower base of the bus compartment of the switchgear with the use of a mounting bracket, screws and bolt connection. A stepping motor and a winding mechanism are fixed on the first supporting stand, and on the second - a second gear pulley attached with a mounting plate. The first gear pulley and clutch are attached to the stepping motor. A toothed belt is worn on the first and second toothed pulleys. One contact core of the reed switches is connected to the timing unit using the first connecting cable, which is fixed at one end on the plate with the reed switches, laid through the air to the reeling mechanism, from the reeling mechanism along the first support rack to the lower base of the busbar compartment of the switchgear, the lower base of the switchgear compartment and is inserted into a plastic sleeve laid along the bottom base and the wall of the switchgear compartment to the timing unit to which it is connected The other end of the first connecting cable. Using the first connecting cable, the other contact core of the reed switches is connected to the output of the circuit breaker with a plus sign. Using a second connecting cable, the stepper motor is connected to a control panel with a touch screen. The second connecting cable is laid along the first supporting rack to the lower base of the switchgear bus compartment, along the lower base of the switchgear bus compartment and wound in a plastic sleeve. The first and second connecting cables and the plastic sleeve are attached to the supporting posts, the lower base and the wall of the busbar compartment of the switchgear with plastic clamps. The first and second inputs of the control panel are connected via wires to the outputs of the circuit breaker with plus and minus signs, respectively. One of the inputs of the executive body is connected using a wire to the output of the circuit breaker with a minus sign. The inputs and outputs of the plate with reed switches, control panels, timing unit and actuator are sealed with rubber gaskets.

In FIG. 1 shows a unit for mounting reed switches.

In FIG. 2 shows the location of the three blocks for mounting the reed switches in the bus compartment of the switchgear.

In FIG. Figure 3 shows the location of the control panel, the timing unit and the actuator in the switchgear measurement and protection cabinet.

A device for overcurrent protection of electrical installations contains three units for mounting the reed switches and regulating their operation current. Each unit for mounting the reed switches and regulating their operating current contains a plate 1, on the outside of which six reed switches 2, 3, 4, 5, 6, 7 are fixed at different angles to the plane of the cross section of the busbar 8. Plate 1 is attached to the central 9 and side 10 holders. The central holder 9 is attached to the toothed belt 11, with the possibility of movement along it relative to the current-carrying bus. The lateral holders 10 are attached to the running axles 12. The ends of the running axles 12 are attached to the first 13 and second 14 support posts fixed to the lower base of the switchgear busbar using a mounting bracket 15, screws 16 and bolt connection 17. On the first supporting stand 13, a step an electric motor 18 and a winding mechanism 19. A first gear pulley 20 and a clutch 21 are attached to the stepping motor 18. A second gear pulley 22 is attached to the second support post 14, attached by means of a mounting plate 23. On The first 20 and second 22 toothed pulleys are fitted with a toothed belt 11. One of the contact cores of the reed switches 2, 3, 4, 5, 6, 7 is connected to the timing unit 24 using the first connecting cable 25, which is fixed at one end to the plate 1, laid along air to the winding mechanism 19, from the winding mechanism 19 along the first supporting column 13 to the lower base of the switchgear bus compartment, along the lower base of the switchgear bus compartment and is inserted into a plastic sleeve 26, laid along the lower base and rear wall of the switchgear bus compartment until timed its block 24, to which the other end of the first connecting cable 25 is connected. The other contact core of the reed switches 2, 3, 4, 5, 6, 7 is connected to the output of the circuit breaker 27 with a plus sign using the first connecting cable 25. A stepper motor 18 of each of the three reed switch mounting units and controlling their operating current with the help of the second connecting cable 28 is connected to the control panel 29 with a touch display 30. The second connecting cable 28 is laid along the first supporting rack 13 to the lower base of the switchgear bus compartment, on the lower base switchgear compartment and wound into a plastic sleeve 26. The first 25 and second 28 connecting cables and plastic sleeve 26 are attached to the first supporting rack 13, the lower base and the wall of the busbar ESA switchgear using plastic clamps 31. The first and second inputs of the control panel 29 via wires 32 connected to the outputs of the circuit breaker 27 with characters "plus" and "minus", respectively. The Executive body 33 using wires 34 is connected with one input to the output of the timing unit 24, and the other to the output of the circuit breaker 27 with a minus sign. To seal and seal the entrances and exits: plate 1 uses a rubber gasket 35 (Fig. 2); control panels 29 rubber pads 36, 37 are used; the timing unit 24 uses rubber gaskets 38, 39, 40; the executive body 33 uses rubber gaskets 41 (Fig. 3). The timing unit 24, the circuit breaker 27, the control panel 29, the actuator 33 are located in the switchgear measurement and protection cabinet.

As reed switches 2, 3, 4, 5, 6, 7 can be used reed switches type MKA-20, cables 25, 28 - cables of the brand Olflex classic 100 4 * 1.5 and Olflex classic 100 8 * 1.5, wires 32, 34 - wire brand PV-1 * 6. As a stepping motor 18, a motor of the type "SL42STH48-1504A" can be used, a circuit breaker 27 is a switch of the type "AP-50". All structural elements, except for the stepper motor, mounting bracket, screws and bolt connections are made of non-magnetic material.

Consider, for example, the protection of an electric motor VAO-5000-2 UHL4, with a capacity of 5 MW, connected to a switchgear cell of type K-63-10, made using a reed switch 2 located to the cross-sectional plane of the busbar 8 at an angle of 0 ° degrees. The remaining five reed switches located on the plate 1 are designed to provide a more accurate choice of settings, and will be used if it is not possible to select the reed switch 2 with the necessary magnetomotive force.

Calculate the value of the tripping current of the protection I s.z. in the current-carrying bus, at which the current protection should work, depending on the detuning coefficient and the starting current of the electric motor according to the formula:

Figure 00000001

where K OT - offset coefficient;

I start - starting current of the electric motor, A.

Then, according to the tabular data, a reed switch 2 is taken with a predetermined magnetomotive actuation force Fcp, for example, 35 A⋅vit. Calculate the distance h from the current-carrying bus 8 to the reed switch 2 according to the formula:

Figure 00000002

Where

Figure 00000003
- the length of the inductor, m;

π is a constant.

Then, in the busbar compartment of the switchgear at a safe distance equal to 0.12 m from the current-carrying busbars 8, three mounting reed switches are mounted and their response current is regulated, the first 25 and second 28 connecting cables and a plastic sleeve 26 are laid. respectively, the timing unit 24, the circuit breaker 27, the control panel 29 and the actuator 33 are connected.

Turn on the circuit breaker 27, supplying power to all elements of the claimed current protection on the reed switches. On the touch screen 30 of the control panel 29, the distance from the live busbars 8 is displayed, on which the plate 1 is currently located, for example 0.2 m. Then, by pressing the virtual button “Forward” (not shown), the step motor 18 is started on the touch screen 30 , which moves the plate 1 closer to the live busbars 8. When moving the plate 1, the length of the first connecting cable 25 is fixed using a reeling mechanism 19 to avoid sagging. After the value 0.181 m is displayed on the touch screen 30, release the virtual button "Forward". Reed switch 2 is installed at the required distance from the current-carrying busbars 8. The rest of the fastening units of the reed switches and regulating their operating current are similarly configured.

When a short circuit occurs at the terminals of the protected motor, the current in the current-carrying buses 8 becomes greater than the protection trip current. Therefore, the reed switch 2 closes its contacts and sends a signal to the input of the timing unit 24, which, after a time delay, sends a signal to the input of the actuator 33. The actuator 33 is activated and sends a signal to turn off the motor switch.

Claims (1)

  1. A device for current protection of electrical installations, containing three units for mounting the reed switches and regulating their operating current, each of which contains a plate, on the outside of which six reed switches are mounted at different angles to the plane of the cross-section of the current-carrying bus, the outputs of the reed switches are connected to the timing element, to the output of which the executive body is connected, the output of the executive body is connected to the circuit breaker circuit, characterized in that the plate with reed switches is attached to the central and side holders, the central holder is attached to the toothed belt with the possibility of movement along it relative to the current-carrying bus, the side holders are attached to the running axles, while the ends of the running axes are attached to the first and second supporting racks mounted on the lower base of the busbar compartment of the switchgear using a mounting bracket, screws and bolt connection, moreover, a stepping motor with the first gears attached to it is fixed on the first supporting rack with a pulley and a clutch, as well as a winding mechanism, on the second supporting rack a second gear pulley attached with a mounting plate, a gear belt is put on the first and second gear pulleys, one of the contact cores of the reed switches is connected to the timing unit using the first connecting cable, which fixed at one end on a plate with reed switches, laid through the air to the reeling mechanism, from the reeling mechanism along the first support column to the lower base of the switchgear bus compartment, along the lower base of the switchgear compartment and is inserted into a plastic sleeve laid along the lower base and the wall of the switchgear compartment to the timing unit, to which the other end of the first connecting cable is connected, the other contact core of the reed switches is connected to the output of the circuit breaker with a plus sign using the first connecting cable , the stepping motor is connected to the control panel with a touch screen using the second connecting cable, the second connecting cable is laid along the first supporting cable the first rack to the lower base of the busbar compartment of the switchgear, along the lower base of the busbar compartment of the switchgear and inserted into a plastic sleeve. The first and second connecting cables, as well as the plastic sleeve, are attached to the supporting posts, the lower base and the wall of the switchgear bus compartment using plastic clamps, the first and second inputs of the control panel are connected by wires to the outputs of the circuit breaker with plus and minus signs accordingly, one of the inputs of the executive body is connected with a wire to the output of the circuit breaker with a minus sign, the inputs and outputs of the plate with reed switches, control panels, timing unit and the body are sealed with rubber gaskets, the timing unit, circuit breaker, control panel, and executive body are located in the switchgear measuring and protection cabinet.
RU2018100443A 2018-01-09 2018-01-09 Device for current protection of electrical installations RU2678189C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1086494A2 (en) * 1982-10-22 1984-04-15 Павлодарский Индустриальный Институт Measuring member for current protection device
EP1298770A2 (en) * 2001-09-28 2003-04-02 Eaton Corporation Method and apparatus for detecting and suppressing a parallel arc fault
RU150814U1 (en) * 2013-02-13 2015-02-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский политехнический университет" Measuring body for relay protection of a line with asymmetric currents
RU2584548C1 (en) * 2015-04-01 2016-05-20 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Device for maximum current protection of electric installations

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1086494A2 (en) * 1982-10-22 1984-04-15 Павлодарский Индустриальный Институт Measuring member for current protection device
EP1298770A2 (en) * 2001-09-28 2003-04-02 Eaton Corporation Method and apparatus for detecting and suppressing a parallel arc fault
RU150814U1 (en) * 2013-02-13 2015-02-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский политехнический университет" Measuring body for relay protection of a line with asymmetric currents
RU2584548C1 (en) * 2015-04-01 2016-05-20 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Device for maximum current protection of electric installations

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