WO2023146429A1

WO2023146429A1 - Instrument for measuring, metering and monitoring electrical energy

Info

Publication number: WO2023146429A1
Application number: PCT/RU2022/000026
Authority: WO
Inventors: Юрий Борисович СОКОЛОВ; Сергей Андреевич РАССВЕТОВ
Original assignee: СОКОЛОВ, Сергей Юрьевич
Priority date: 2022-01-31
Filing date: 2022-01-31
Publication date: 2023-08-03

Abstract

The present solution relates to the field of measuring technology and is intended as a connector for instruments for metering, monitoring and measuring electrical energy in the domestic and industrial sectors. The technical result is that of simplifying the structure of the claimed device, increasing the ease of connection of an electrical measuring instrument, reducing the labour intensity of the connection operation, reducing damage to insulation and increasing the reliability and safety of the connection. The claimed device includes a split housing comprising a base and a cover; a holder for electrical wires, which is arranged between the base and the cover and has guide slots; a measuring circuit board arranged between the base of the housing and the electrical wire holder; current transformers having a split core, each of which is mounted in one of the slots of the electrical wire holder so that an electrical wire passes through an opening in the core; V-shaped blade contacts, the cutting edges of which are mounted transverse to a slot and are fastened to the lateral sides thereof so as to be capable of cutting through the insulation of an electrical wire and establishing electrical contact therewith; and clips for the electrical wires, each of which is mounted on the holder so as to be capable of clamping and holding an electrical wire in a slot.

Description

DEVICE FOR MEASURING, ACCOUNTING AND CONTROL OF ELECTRIC ENERGY

Technical field

The solution belongs to the field of measuring technology, and is designed to connect metering, control and measurement of electricity in the domestic and industrial sectors.

Previous level

Connection to electrical wires of all metering, control, measurement devices of electrical energy currently produced in the Russian Federation and abroad are based on breaking the wires going from the substation to the client, in which there are input electrical wires from the supply phases and neutral, and output electrical wires phases and neutrals that go to the load, that is, to the consumer of electrical energy. Thus, the electrical energy metering device is included in the break of each electrical wire, and this leads to a significant complication of the device and an increase in labor intensity during its installation and replacement. The complication of the device lies in the fact that in order to connect it, it is necessary to provide a number of details in it.

- a power block made of high fire resistance plastic (T>900 ° C), - power sockets (4 pcs. for single-phase devices and 8 pcs. for three-phase ones),

- screws for connecting wires to power buses (8 pcs. for single-phase devices and 16 screws for three-phase ones),

- power busbars made of pure copper for 100A current with a cross section of ~ 20 mm ² with a length of at least 10 cm (2 pcs. for single-phase devices and 4 pcs. for three-phase ones).

The complexity of installing an electrical energy metering device consists in the following operations:

- cutting each electrical wire and stripping the ends (4 pcs. for a single-phase device and 8 pcs. for a 3-phase device), - inserting each wire into the sockets of the device and screwing in 8 screws for a single-phase device, and 16 screws for a three-phase device.

It should be borne in mind that the points of input and output of wires are quite difficult to seal, and the sealing sleeves can only be located outside and therefore accessible for unauthorized intervention (a sealed access cover and terminal screws do not give a result). In addition, repeated rupture of wires, through which a current of 100A can flow and subsequent connection by welding or screws, leads to heating of all power parts and creates the possibility of fire and the presence of additional losses in the device, so the power block must be made of non-combustible material.

In this work, the task is to eliminate all the above details from the device, to create a small-sized device with absolute protection from external weather factors according to IP65, I P66, with the ability to install this device on site in a few seconds.

Known electric energy meter with all of the above disadvantages (RU 182808, G01R 11 / 00, published 04. 09. 2018) .

The technical result is a simplification of the device design, an increase in the convenience of connecting an electrical measuring instrument, a decrease in the complexity of the connection operation, a decrease in insulation damage, an increase in the reliability and security of the connection.

Technical solution

It should be noted that the solution disclosed in the journal Power Electronics, No. 4, 2015 (https : / /power-e .ru/wp-content/uploads /5518 .pdf , found 25.09.2021) is famous, where the advantages of current transformers, with a toroidal core, including those with a split core.

Connectors are also known for connecting flat cables using knife contacts, by cutting through the cable insulation. ( ttps : / /web . archive . org/web/20140630082236/http : / / w . j aycar . com/ images_uploaded/IDCconnJ . pdf , retrieved 25.09.2021 ) .

The claimed solution is based on the use of split current transformers operating on the principle of current clamps, i.e. e . having a core with a moving part.

A device for connecting an electrical measuring instrument to electrical wires contains a detachable housing, including a base and a cover; electrical wire holder, located between the base and the cover, and having guide grooves, each of which is designed to accommodate an electrical wire; a measuring board installed between the base of the housing and the holder of electrical wires; current transformers, having a ring core, with each transformer installed in one of the grooves of the electrical wire holder so that the electrical wire passes into the hole of the core; V-shaped knife contacts, the cutting edges of which are the inner edges of the knife contact, installed across the groove and fixed on its sides with the possibility of cutting the insulation of the electrical wire and creating electrical contact with it; clamps of electrical wires, each of which is mounted on a holder with the possibility of pressing the electrical wire to the blade of the V-shaped knife and fixing the electrical wire in the groove.

An option is to use a toroidal transformer whose core has a split moving part. In this case, for reliable fixation of the movable upper part of the transformer, there are silicone stops on the inner surface of the housing cover, which are made with the possibility of pressing the movable part of the transformer core to its part fixed in the groove when the cover is closed.

In FIG. 1 shows a three-dimensional image of the device with the lid open, Fig. 2 is an enlarged view of a fragment of the longitudinal section of the device for connecting to electrical wires, shown in Fig. 1 . In FIG. 3 shows an enlarged three-dimensional image of the groove in the dielectric housing of the device for connecting to electrical wires. In FIG. 4 shows a three-dimensional image of the device assembly mounted on wires

3-phase network.

In the drawings, the elements of the device are indicated by the following positions:

1- base of the instrument case

2- instrument body cover

3- dielectric body of the device for connecting to wires,

4 - guide grooves for laying wires,

5- current transformer with toroidal core,

6- fixed part of the toroidal core,

7- movable part of the toroidal core,

8-hole toroidal core transformer,

9- V-blade contacts,

10- wires,

11- wire clamps in the guide groove for fixing the knife contact on the wire,

12- silicone stops,

13- hooks on the side walls of the groove for fixing the clamp 8,

14 - wedge-shaped protrusions on the side walls of the groove to prevent longitudinal displacement of the wire in the groove,

15 - connection of blade contacts with measuring board

To illustrate the solution, the drawings show the design of a device for connecting to electric wires of a three-phase network, the body of which has a non-conductive base 1 and a cover 2, a measuring board (not shown) and a device for connecting to wires 10, including a dielectric housing 3 having guide grooves 4 for laying wires 10 in them, current transformers 5 with a toroidal core installed in each of the grooves 4 of the dielectric housing 3 so that the wire 10 laid in the groove 4 passes into the hole 8 of the core of the current transformer 5, and clamps 11 wires 10, fixing the wire in the groove 4 . On the side walls of each groove 4, V-shaped knife contacts 9 are fixed, which serve to cut through the wire insulation and provide an electrical connection between the wire conductor 10 and the measuring board.

The device for connecting to the current-carrying part of the wire works as follows. An electric wire 10 is placed in each of their grooves 4 (the wire is shown only in the nearest groove). This is possible with open clamps 11 that fix the electrical wire 10 passing through the hole 8 of the toroidal transformer 5 placed in the groove 4 . After laying the wires, the clamps 11 are closed and fixed. When the clamp 11 closes, the wire 10 moves downward and the blade contacts 9 cut through the insulation of the electrical wire with cutting edges and come into contact with the conductors of the wire 10. Thus, each clamping means is configured to move the wire 10 along the V-shaped blade contact 9 and is provided with a locking means in the guide slot 4'.

Voltage is supplied through the blade contacts 9 to the measuring board (not shown). Knife contacts 9 made of beryllium bronze cut wire insulation 10 . To avoid loss of contact when the device is moved or the wire is twitched to one side or the other, wedge-shaped protrusions 14 are arranged in the walls of the groove 4, the pointed edge of which is adapted to prevent longitudinal displacement of the wire in the groove, located to the left and right of each clamp 11. These protrusions also cut into the insulation of the wire 10 preventing it from moving in the longitudinal direction. Knife contacts 9 and fixing protrusions are V-shaped, converging towards the bottom so that wires of different diameters (within certain limits) can be used for connection. Wire with a smaller diameter will be inserted more deeply by clamp 11 . In order for the hooks 13 and the locking protrusions 14 not to disengage, the clamp 11 is fixed by the stops 12 when the cover 2 of the device is closed.

Current transformers 5 are held in their position due to friction with the plastic of the housing 3 of the holder 1, and after closing covers 2 are pressed using additional silicone stops 12 installed on the cover 2, or by other methods (there are many of them).

It should be noted that this design is preferable when using split current transformers, since in this case the technical result is achieved in a larger area of application of the device. The claimed device is especially convenient for Split counters. In this case, both versions (with a split transformer and a solid one in the form of a torus) will be almost the same in terms of installation labor, since the distance from the electrical measuring device to the electrical wires is usually small.

Connecting a device with a split core transformer is as follows.

The cover 2 of the instrument housing opens, the clamps 11 open, the upper movable parts 7 of the current transformers 5 are opened, installed in the grooves 4 of the dielectric housing of the device, each wire 10 is inserted into one of the guide slots 4 of the specified dielectric housing 3, the upper movable parts of the current transformers 5 are closed, with finger pressure, the clamping means 11 moves the wire along the V-shaped knife contact deep into the guide groove and is fixed by the clamp 11 on the walls of the groove (4 and 8 pcs., respectively, for single- and three-phase devices), the cover 2 of the device case is closed and the upper movable part 7 of the transformers 5 is pressed against its lower part 6 with the help of silicone stops 12 attached to the cover 2 . If necessary, a test switch is made and the LEDs present in the measuring circuit show that there are contacts in all phases.

Claims

FORMULA

1 . A device for measuring, accounting and controlling electrical energy, connected to electrical wires without breaking them, containing:

- the body of the device, including the base and cover;

- measuring board;

- a device for connecting to electrical wires, having a dielectric housing and wire clamping means, characterized in that the dielectric housing of the connection device has guide grooves for laying electrical wires, in each guide groove there is a current transformer with a toroidal core so that the wire passes into the hole core ; on the side walls of the guide grooves, V-shaped knife contacts are fixed, the cutting edges of which are installed across the guide groove to cut the wire insulation and create electrical contact with its current-carrying part, while the groove walls have wedge-shaped protrusions, the pointed edge of which is adapted to prevent longitudinal displacement of the wire in groove , and each wire clamping means is configured to move the wire along a V-shaped blade contact and is provided with a means of locking in the guide slot .

2. A device for measuring, accounting and controlling electrical energy according to p. 1, characterized in that the toroidal core of the current transformer has a movable part, while the fixed part of the toroidal core is fixed in the guide groove of the dielectric housing of the device for connecting an electric wire.

3 . A device for measuring, accounting and controlling electrical energy according to p. 2, characterized in that the inner surface of the cover has silicone stops for pressing the moving part of the toroidal current transformer.

4 . A device for measuring, accounting and controlling electrical energy according to p. 1 , characterized in that the dielectric housing

7 connection device has two guide grooves for laying electrical wires of a single-phase network.

5. A device for measuring, recording and controlling electrical energy according to claim 1, characterized in that the dielectric housing of the device for laying the connection has four grooves for accommodating electrical wires of a three-phase network.

6. A device for measuring, recording and controlling electrical energy according to claim 1, characterized in that it has a display mounted under the transparent cover of the device housing.

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