CN1111805A

CN1111805A - Differential trip unit

Info

Publication number: CN1111805A
Application number: CN95101496A
Authority: CN
Inventors: 克劳德·伯恩奥特; 琼-保罗·乔利; 帕特里克·吉隆
Original assignee: Schneider Electric SE
Current assignee: Schneider Electric SE
Priority date: 1994-01-26
Filing date: 1995-01-25
Publication date: 1995-11-15
Anticipated expiration: 2015-01-25
Also published as: DE69515711T2; FR2715517A1; EP0665569B1; ATE191099T1; EP0665569A1; KR950034346A; DE69515711D1; CN1048115C; BR9500317A; ES2144592T3; FR2715517B1

Abstract

The invention relates to a differential tripping device (10), which is provided with an auxiliary power supply. The differential tripping device comprises a summated mutual inductor (28), a mechanism (16) controlled by a non-polarized type electromagnetic relay (34), a mechanical tripping connecting rod (18), and a device of a coil (48) which can excite the reply (34) during the process that an insulation fault happens in an electric power system. The tripping reply (34) comprises positioning devices (60, 62; 90, 92), which are designed to be embedded into the notches (80, 82; 86, 88) of an outer casing so that a preset clearance (55) can be formed between an actuating pin (54) and the mechanical tripping connecting rod (18) under the non-action position.

Description

Differential trip unit

The present invention relates to a kind of differential trip unit, design makes on the multipole circuit breaker device of its connection and coupling, so that form the differential circuit breaker of a modular, described tripgear is contained in the insulation crust, and it comprises:

A differential current detector comprises a summation instrument transformer that is solenoid type, and each power lead runs through by constituting elementary winding,

An operating mechanism, by electromagnetism tripping relay control with an actuator pin, so that the trip command of relay is delivered on the release unit through the mechanical trip connecting rod at the operating position place,

The device that is used for the field application relay coil moves when the terminal voltage of the secondary winding of summation instrument transformer surpasses the threshold value that presets,

Test and signal circuit, it has test button and trip indicator.

The differential trip unit of mentioned kind is introduced applying for a patent among the file FR-A-2437692 of the applicant.Employed relay belongs to the polarization type, owing to adopt permanent magnet, the magnetic flux that the magnetic flux of the permanent magnet in air gap and solenoid produce subtracts each other.Movably yoke is to be made of the blade that pivots, and the required energy that trips is very low and is provided by fault current.This tripgear does not need accessory power supply, but the manufacturing of polarized relay is more expensive relatively and complicated.

Order of the present invention provides a kind of differential trip unit that adopts the tripping relay of designs simplification.

Differential trip unit of the present invention is characterized in that, the device that is used for excitation coil is configured in the electronic processing circuit with accessory power supply, an input is connected to the secondary winding of summation instrument transformer, output is electrically connected with coil, be that also tripping relay comprises positioner, design makes in its paired otch that is embedded in shell, so that be implemented under the non-operating position gap that formation is preset between the actuator pin of mechanical trip connecting rod and operation spline (spline).

The positioner of relay is configured on the supporting arrangement made of plastic material by insulation, and this supporting arrangement comprises a tubular holders that is wound with coil between its two upper flange.

According to a preferred embodiment of the present invention, this supporting arrangement comprises a U-shaped en-block construction, and it has that two located lateral cantilevers extend parallel to each other and perpendicular to sleeve, and also has two centering lugs that are positioned at the sleeve plane.

According to only proposing as limiting examples and the following introduction of expression illustrative embodiment in the accompanying drawings, it will be more apparent making other advantage and characteristics, wherein

Fig. 1 is the front view of modular differential circuit breaker of the present invention;

Fig. 2 is the perspective view of expression differential trip unit shown in Figure 1 after removing lid;

Fig. 3 is the end view after the printed circuit board (PCB) installed in removing summation instrument transformer and the bottom at shell of device shown in Figure 2;

Fig. 4 is the perspective view that the ratio of tripping relay supporting member is amplified;

Fig. 5 is the decomposition diagram of tripping relay;

Fig. 6 is the view of relay shown in Figure 5 after the element assembling;

Fig. 7 is the cross-sectional view of being got along the line 7-7 among Fig. 3.

In Fig. 1, differential trip unit 10 connects on the release unit 12 that is coupled to the two poles of the earth so that form a modular differential circuit breaker 14.The mechanism 16 of differential trip unit 10 utilizes a mechanical trip connecting rod 18 to the common trip bar generation effect of release unit 12 to be connected on the release unit 12, is used to transmit the instruction of differential tripping operation.Support 22 couples together two actuating handles 24,26 at release unit 12 the two poles of the earth.

Be configured in having of (consulting Fig. 2 and Fig. 3) in the mechanism 16 in differential trip unit 10 inboards: summation instrument transformer 28, test and signal circuit 29, an electromagnetism tripping relay 34 and a electronic processing circuit 36 with accessory power supply with test button 30 and trip indicator 32.

Summation instrument transformer 28 comprises a ringwise magnetic circuit, and two power leads 38,40 are by this magnetic circuit and be electrically connected to the following link of circuit breaker 12, constitute the elementary winding of instrument transformer 28.Secondary winding 42 is on toroid and utilize lead 44 to be electrically connected to the input of electronic circuit 36.The output of electronic circuit 36 is connected on the coil 48 of tripping relay 34 with electrical connector 46.

The operating principle of mechanism 16 is similar with the content that institute in the FR-A-2437692 file is introduced in detail, does not still have second restoring link.In fact to point out that the support 22 of handle 24,26 mechanically is not couple in the mechanism 16, because tripping relay 34 is the simple actuators with shunt trip coil 48, does not have permanently-polarised magnet.

The mechanical trip connecting rod 18 of mechanism 16 comprises a sliding guide 50 that operation spline 52 is housed, and spline 52 is towards actuator pin 54 configurations of tripping relay 34, and the gap 55 that has is less than 1 millimeter.

Consult Fig. 4 to Fig. 7, tripping relay comprises that made by insulating plastics material, as to have a U-shaped structure supporting arrangement 56, its two flanges of being made up of tubular holders 58 that is configured in middle body and two the located

lateral cantilevers

60,62 that extend parallel to each other 64,66 that utilize make sleeve 58 vertically upward form framework so that hold coil 48, and

flange

64,68 is in the extension expansion of cantilever 60,62.Inboard in the hole 68 of insulating sleeve 58, a magnetive cord 70 that mechanically is couple on the actuator pin 54 is installed in mode in axial sliding.Back-moving spring 72 is installed between the fixing bearing-surface 74 of the shoulder 73 of iron core 70 and sleeve 58, and coaxial surrounding pin 54, during by electronic circuit 36 excitations, pushes iron core 70 to non-operating position (Fig. 7) with convenient coil 48.This non-operating position is accurately limited by retainer 76, and retainer 76 is secured on the actuator pin 54 of this bump that is pasting sleeve 58 78.

Produce under the situation of insulation fault in the electric power system that protection is provided by differential circuit breaker 14, summation instrument transformer 28 sends a trip command to electronic circuit 36, makes coil 48 excitations of relay 34.Movable core 70 moves to operating position, compression spring 72, and pin 54 drives guide plate 50 along identical direction simultaneously, so that drive tripping operation connecting rod 18 to trip position.By the locking of removing circuit breaker 12 each utmost point contact is opened then.

When relay 34 is in non-operating position, need be adjusted in pin 54 and the tripping operation guide plate 50 operation spline 52 between end play 55, relay 34 is correctly located with respect to the mechanism 16 of differential trip unit 10.For this reason, because the end of

location cantilever

60,62 embeds first couple of otch 80,82(Fig. 2 and Fig. 3 that is configured in the insulation crust 84) among, make supporting arrangement 56 occupy preposition in the tripgear 10.On shell 84, be provided with second pair of otch 86,88(Fig. 3) so that admit centering lug 90,92(Fig. 4 on the plane be in cover 58).Supporting arrangement 56 is installed on 4 supporting points that limited by

otch

80,82,86,88, has guaranteed the accurate location of tripping relay 34, can obtain gap required under the non-operating position 55 automatically with respect to mechanism 16.

At least one of them (Fig. 4) lug 90 in the centering lug has spline 96, and design makes its pincers go into the edge of otch 86, supporting arrangement 56 is installed on the shell 84 guaranteeing.Location cantilever 60 is equipped with a protuberance, and shoulder 98 of configuration is designed for and strengthens the stability of keeping supporting arrangement 56 on it.

In Fig. 7, spring 100 is embedded between the end of shell 84 inwalls and guide plate 50, makes to rely on the effect of back-moving spring (not shown) to push guide plate 50 to the direction that trips.Can realize the state memorization function of trip indicator 32 by 100 pairs of guide plate 50 bias that produce of spring.

Very clear, utilize and the supporting arrangement 56 that is different from the shape of introducing previously, can realize the three-dimensional centering effect of tripping relay 34 with respect to the mechanism 16 of differential trip unit 10.

Claims

1, a kind of differential trip unit (10), design makes its connection and is coupled on the multipole circuit breaker device (12), and to form a modular differential circuit breaker (14), described tripgear (10) is contained in the insulation crust (84), and it comprises:

A differential current detector, it comprises an annular summation instrument transformer (28), constitutes elementary winding by wherein each power lead (38,40),

An operating mechanism (16), it passes to release unit (12) by electromagnetism tripping relay (34) control that has actuator pin (54) in order at operating position the trip command of relay (34) is passed through mechanical trip connecting rod (18),

The device that is used for field application relay (34) coil (48) when the terminal voltage of the secondary winding (42) of summation instrument transformer (28) surpasses the threshold values that presets,

And test and signal circuit (29), it has test button (30) and trip indicator (32),

It is characterized in that, the device that is used for excitation coil (48) is configured in the secondary winding (42) that the electronic processing circuit (36) with accessory power supply, an input are connected to summation instrument transformer (28), output is electrically connected with coil (48), and tripping relay (34) comprises positioner (60,62; 90,92), design makes it embed the paired otch (80,82 of shell (84); 86,88), to be implemented in the gap of presetting (55) that between the operation spline (52) of actuator pin (54) and mechanical trip connecting rod (18), obtains under the non-operating position.

2, differential trip unit according to claim 1, it is characterized in that, the positioner of relay (34) is configured on the supporting arrangement of being made by insulating plastics material (56), and this device comprises a tubular holders (58) that is wound with coil (48) between two flange (64,66).

3, differential trip unit according to claim 2, it is characterized in that, sleeve (58) has hole (68), magnetive cord (70) is installed in mode in axial sliding in hole (68), machinery is couple on the actuator pin (54), is that also back-moving spring (72) in the load hole (68) places between the bearing-surface (74) of the shoulder (73) of iron core (70) and sleeve (58).

4, according to claim 2 or 3 described differential trip units, it is characterized in that, supporting arrangement (56) comprises a U-shaped monomer structure that two located lateral cantilevers (60,62) are arranged, this cantilever (60,62) extends parallel to each other and perpendicular to sleeve (58), and two centering lugs (90,92) are positioned on the plane of sleeve (58).

5, differential trip unit according to claim 4 is characterized in that, one of them lug (90) of centering lug has chucking spline (96) at least.

According to claim 2 or 3 described differential trip units, it is characterized in that 6, the retainer (76) that the actuator pin (54) of relay (34) comprises is pasting the protruding forward part (78) of sleeve (58) under the non-operating position of magnetive cord (70).

7, differential trip unit according to claim 1 is characterized in that, the operation spline (52) of mechanical trip connecting rod is configured on the movable guide plate (50) by the promotion of spring (100) edge tripping operation direction.