CN1041970C

CN1041970C - Low energy shunt trip

Info

Publication number: CN1041970C
Application number: CN94102496A
Authority: CN
Inventors: 丹尼特·巴格利尼
Original assignee: Circuit Breakers Ind Ltd
Current assignee: Circuit Breakers Ind Ltd
Priority date: 1994-02-28
Filing date: 1994-02-28
Publication date: 1999-02-03
Anticipated expiration: 2014-02-28
Also published as: CN1107605A

Abstract

The present invention relates to an excitation shunting tripping device which comprises an armature (18) arranged on a ferromagnetic supporting seat (12) in a pivot shaft mode; a U-shaped component (20) is arranged on the supporting seat (12) through a spacing block (30) made of non-magnetic material. An arm (22) of the U-shaped component (20) is provided with a coil (34), a permanent magnet (32) is clamped between the cross bridge part (26) of the U-shaped component (20) and a part (14.1) of the supporting seat (12).

Description

A kind of shunt trip to the drop-away current sensitivity

The present invention relates to a kind of shunt trip to the drop-away current sensitivity.

UK Patent Application GB2041649A discloses a kind of shunt trip, and the specification of this application has been described a magnet, comprises a yoke body that has pole shoe, and an armature and a permanent magnet are wound with coil on the pole shoe therein.Thereby permanent magnet is soldered to the magnetic shunt of this yoke body formation permanent magnet on the yoke body.The magnetic field that permanent magnet provides is fixed with closed armature.Drop-away current in the coil reduces this magnetic field, and armature is opened.

The purpose of this invention is to provide a kind of shunt trip to the drop-away current sensitivity, it can be handled by the low branch current of energy level, and its characteristic can change by mode simply and repeatably, thereby further improves above-mentioned shunt trip.

For this reason, the invention provides a kind of shunt trip to the drop-away current sensitivity, this device comprises: one can be in first position, i.e. make position and second position, the i.e. armature that moves between the open position; A propulsion plant that is used for armature is advanced to from its first position its second position; A bearing that includes a pillar, armature are sent out pivotably and are contained on the pillar, and this bearing is made by ferrimagnet; Determined jointly that with armature first magnetic circuit of first magnetic circuit determines device for one, include a pole shoe and determine parts, when armature during in its first position armature determine that with pole shoe parts contact, when armature is positioned at its second position, then determine that with pole shoe parts have at interval; In first magnetic circuit, produce first field generator for magnetic of magnetic flux; Determine that with pole shoe device and pillar determine that second magnetic circuit of second magnetic circuit determine device for one;

Determine that with pillar the 3rd magnetic circuit of the 3rd magnetic circuit determine device for one, this magnetic circuit determines that device do not determine parts by pole shoe; With

In second and the 3rd magnetic circuit, produce second field generator for magnetic of magnetic flux.

Can provide spacer block parts in the 3rd magnetic circuit, these spacer block parts are used for the magnetic resistance of preordering method change magnetic circuit.

First magnetic circuit determines that device can have air gap between its part and armature.

First field generator for magnetic can be a coil, and drop-away current is from this coil midstream mistake.

Second field generator for magnetic can be a permanent magnet.

Usually, first magnetic circuit determines that device can comprise " U " shape ferromagnetic parts, and its arm has been determined pole shoe, and coil also is placed in around this wall.

Above-mentioned pillar can be a column that armature pivotally is installed on it, and another arm of " U " shape parts is fixed on this column by spacer block.

Bearing can also have a pedestal, and column stretches out from this pedestal.Therefore permanent magnet can be arranged between the cross-bridges part of pedestal and " U " shape parts.

The polarity that is appreciated that coil is such, and it should resist the magnetic flux that is produced by permanent magnet.

At last, propulsion plant can be made of a helical spring, and this spring is an extension spring, links to each other with armature in the other side of the column for pole shoe.

When using, armature can be moved, thereby can contact with pole shoe.When not having electric current in the coil, the magnetic flux of being set up in second magnetic circuit by permanent magnet is enough to make armature to keep contacting with pole shoe.When enough electric currents flow through coil, the part magnetic flux in second magnetic circuit was transferred in the 3rd magnetic circuit, thereby spring moves armature, thereby had triggered tripping mechanism.Armature is reset to and the contacted position of pole shoe again by a resetting device.

By changing free wall and the air gap of armature residual gap and the thickness of spacer block of " U " shape parts, can change the characteristic of shunt trip on request.

Utilize the present invention that a kind of utilization shunt trip that extremely low-energy shunt opening electric current can move can be provided, and the device characteristic can with easy and repeatably method change.

Referring now to accompanying drawing, the present invention will be described with the form of giving an example.

Fig. 1 is the principle profile that a kind of low-yield branch according to the present invention is contained an electromagnetic unit of trip gear;

Fig. 2 is electromagnetic unit and the tripping mechanism schematic diagram together that is in " dropout " state;

Fig. 3 is the schematic diagram that tripping mechanism is in " on " state.

With reference to Fig. 1, the electromagnetic unit of a low energy shunt trip is represented with reference number 10 generally.There is a mild steel bearing 12 unit 10, and bearing 12 has a pedestal 14 and a column 16 that stretches out from pedestal.Column 16 is contained in the middle part of pedestal, and pedestal 14 just has left-hand side part 14.1 and right-hand side part 14.2 like this.A mild steel armature 18 pivotally is installed on the column 16.Spring 19 is connected between the right-hand side part 14.2 and armature 18 of pedestal 14.Spring 19 is extension springs, thereby it draws the right side part of armature 18 downwards towards pedestal 14 directions, thereby tends to make armature 18 to pivot in the direction of the clock.The tripping mechanism that armature rotation toward the clockwise direction is subjected to not showing among Fig. 1 and the restriction of resetting device.Tripping mechanism is illustrated among Fig. 2 and Fig. 3, will discuss below.

Unit 10 also has a mild steel " U " shape parts 20.Parts 20 have left hand side arm 22, right hand side arm 24 and cross-bridges part 26.Right hand side arm is fixed on the column 16 by bolt 28, and spring is positioned at an other side of column relatively.The spacer block 30 that between arm 24 and column 16, has a nonmagnetic substance.As can be seen, arm 22 is longer slightly than arm 24.The free end of arm 22 flushes with the top of column 16, contacts with the free end of arm 22 when armature 18 resistance springs 19 rotate by counter clockwise direction.When armature 18 contacts with the free end of arm 22, between the free end of armature 18 and arm 24, has the air gap of about 0.5mm.

Permanent magnet 32 is clipped between the left-hand side part 14.1 of cross-bridges part 26 and pedestal 14.

Coil 34 on bobbin 36 is positioned on the arm 22.

Be appreciated that arm 22 has constituted a pole shoe.It is also understood that, " U " shape parts 20 and column 16 have been determined first magnetic circuit with arm 24 adjacent part and armature 18, most magnetic fluxs in this magnetic circuit will be by the air gap between arm 24 and the armature 18, because this air gap is more much smaller than the thickness of spacer block 30.In addition, arm 22, cross-bridges part 26, the left-hand side part 14.1 of pedestal 14, column 16 and armature 18 have been determined second magnetic circuit.At last, that part of armature 18 that arm 24, cross-bridges part 26, left-hand side part 14.1, column 16 and column 16 and arm are 24 has been determined the 3rd magnetic circuit, and its magnetic flux also passes spacer block 30.

In application, coil 34 produces magnetic flux in first and second magnetic circuits, and permanent magnet 32 produces magnetic flux in second and the 3rd magnetic circuit.

In application, there is not electric current in the coil 34 when normally moving.The magnetic flux that in second magnetic circuit, produces by permanent magnet 32 make armature 18 be reset mechanism's (not shown) antagonistic spring 19 effect and place with arm 22 contacted positions after can remain on this position.This magnetic flux does not have the strong degree that can make armature 18 closures to itself.After a relative less current flows through coil 34, part magnetic flux is transferred to from second magnetic circuit the 3rd magnetic circuit, the power that makes armature 18 remain on arm 22 places will reduce, armature 18 is turned clockwise by the effect of spring 19, thereby makes tripping mechanism (as Fig. 2, the shown in Figure 3) action of device 10.

The applicant believes, utilizes the electromagnetic unit shown in the figure, and the drop-away current of 6V, a 1mA is enough to make device to be threaded off.

Further, just as noted earlier, the confining force of electromagnetic unit can change along with the variation of the thickness of spacer block 30, and the amplitude of drop-away current also can change by the air gap that changes 18 in arm 24 and armature at an easy rate.

With reference now to Fig. 2 and Fig. 3,, among the figure schematic diagram of unit 10 and tripping mechanism 40 is represented together.Tripping mechanism 40 is in " dropout " state in Fig. 2, be " on " state in Fig. 3.

Tripping mechanism 40 has a release lever 42, and it is connected with armature 18; A support 44; A movable contact headstock 46 and a handle 48.Support 44 can and have an adjutage 52 around axle 50 rotations.An extension spring 54 is so that " crossing the " center " mode is connected between arm 52 and the movable contact headstock 46.Handle 48 has a plush copper 56, and it contacts and move along it with the surface 58 of the inclination of support 44, and it is contacted with release lever 42 when armature 28 and release lever 42 are in its " on " position.The mechanism that makes armature 18 and release lever 42 reset and turn to its " on " position previously discussed does not show in the drawings.

Those skilled in the art will readily appreciate that, when armature 18 when arm 22 is rotated away from, release lever 42 also pivots, thereby has discharged support 44.Thereby support 44 and movable contact headstock just from its " on " rotated position shown in Figure 3 to " dropout " position shown in Figure 2.

Claims

1. the shunt trip to the drop-away current sensitivity (10) includes:

One can be in first position, i.e. make position and second position, the i.e. armature (18) that moves between open position;

A propulsion plant (19) that this armature is advanced to its second position from its first position;

A bearing (12) that includes a pillar (16), armature pivotally is installed on the pillar (16), and bearing is made by ferrimagnet;

First magnetic circuit with definite first magnetic circuit of armature is determined device (20,16,18), and it includes a pole shoe and determines parts (22), determines that with pole shoe parts contact when armature is positioned at its first position; When being positioned at its second position, it then determines that with pole shoe parts have at interval;

First field generator for magnetic (34) that in first magnetic circuit, produces magnetic flux, it is the form of coil, flows through drop-away current during use;

Determine that with pole shoe parts and pillar determine that second magnetic circuit of second magnetic circuit determine device (26,14.1,18) for one

Second field generator for magnetic (32) is used to produce magnetic flux;

It is characterized in that it also comprises;

The 3rd magnetic circuit with definite the 3rd magnetic circuit of pillar is determined device (24,26,14.1,18), and it determines parts without pole shoe;

Second field generator for magnetic produces magnetic flux in second and the 3rd magnetic circuit.

2. shunt trip as claimed in claim 1 is characterized in that, the 3rd magnetic circuit determines that device comprises the spacer block (30) of a nonmagnetic substance.

3. shunt trip as claimed in claim 1 is characterized in that, first magnetic circuit determines that device comprises an air gap.

4. shunt trip as claimed in claim 3 is characterized in that, air gap is positioned at armature and constitutes first magnetic circuit to be determined between the element (24) of the part of device.

5. shunt trip as claimed in claim 1 is characterized in that, second field generator for magnetic comprises a permanent magnet (32).

6. shunt trip as claimed in claim 1 is characterized in that, first magnetic circuit determines that device comprises " U " shape parts (20), and these parts have a first arm (22) and second arm (24), and the first arm constitutes pole shoe and determines parts.

7. shunt trip as claimed in claim 6 is characterized in that, pillar is a column (16), and second arm (24) of " U " shape parts is fixed on this column.

8. shunt trip as claimed in claim 7 is characterized in that, bearing has a pedestal (14), and pillar stretches out from pedestal, and second field generator for magnetic is arranged between the cross-bridges part (26) and bearing of " U " shape parts.

9. shunt trip as claimed in claim 6 is characterized in that, constitutes pole shoe and determines that the first arm (22) of parts is longer slightly than second arm (24).

10. shunt trip as claimed in claim 1 is characterized in that, the magnetic flux that is produced by first field generator for magnetic also passes second magnetic circuit.

11. shunt trip as claimed in claim 1 is characterized in that, propulsion plant is a spring.