CN100580842C

CN100580842C - Leakage breaker

Info

Publication number: CN100580842C
Application number: CN200510085356A
Authority: CN
Inventors: 浅野久伸; 浅川浩司; 高桥康弘
Original assignee: Fuji Electric FA Components and Systems Co Ltd
Current assignee: Fuji Electric FA Components and Systems Co Ltd
Priority date: 2004-07-26
Filing date: 2005-07-26
Publication date: 2010-01-13
Anticipated expiration: 2025-07-26
Also published as: CN1728315A; JP4487673B2; JP2006040666A

Abstract

The present invention provides a ground-fault tripping device including a main circuit contact, a switching mechanism, an operation handle, an overcurrent tripping device and a ground fault detection circuit 7. A switch 22 for a withstand voltage test is connected to a power feed circuit connected between the ground fault detection circuit 7 and the main circuit 1; and the switch for a withstand voltage test is attached to the outside of a case 11 of the interrupter body as an independent exterior switch. By manually subjecting an operation knob 22a to an OFF operation in executing the withstand voltage test, the ground fault detection circuit is separated from the main circuit, the interrupter body is tripped to open a main circuit contact at the same time and thereafter a switching mechanism part 3 is locked in a trip operation state, prevents the fault operation of the forgetting connect the a switch for a withstand voltage test after test.

Description

Residual current circuit breaker

Technical field

The present invention relates to be used for the residual current circuit breaker of low-voltage distribution system; in detail; relate to when carrying out the withstand voltage test of residual current circuit breaker, cut off to protect from main circuit and exempt from the proof voltage test switch that test voltage destroys carrying electric-leakage detection circuit on circuit breaker.

Background technology

As the protection equipment of low-voltage distribution system, known have Inturruptor for sub-line, a residual current circuit breaker, and (Japan) universal residual current circuit breaker generally constitutes and has excess current protective function and ground protection function at home.In addition, in the residual current circuit breaker in nearly stage, in order to improve the ease of use of customer-side, except the Inturruptor for sub-line of same structure and the main body case of residual current circuit breaker are become the similar shape series, its major part of sharing and the residual current circuit breaker that constitutes monomer structure has become main flow (for example, with reference to patent documentation 1) as much as possible also.

Secondly, Fig. 3 shows the circuit diagram of the residual current circuit breaker (three-phase circuit is used) of prior art, in addition, its package assembly has been shown in Fig. 4 and Fig. 5.In Fig. 3, the 1st, the three-phase main circuit of R, S, T phase, the 2nd, main contact, the 3rd, the switching mechanism of main contact 2, the 4th, operating grip, the 5th, be used for detecting the overload current that flows at main circuit and make switching mechanism implement to disconnect the overcurrent release device of the thermal type that moves.

In addition, take place and make switching mechanism disconnect the electric leakage releasing device of action for the ground connection of detecting distribution system, it comprises: the zero phase current transformer 6 that detects the unsymmetrical current of main circuit 1 with the main circuit 1 of R, S, T phase as Primary Conductor; Secondary output level according to zero phase current transformer 6 detects the electric-leakage detection circuit (electronic circuit that contains IC) 7 that ground connection is taken place; And the striping coil unit 8 that makes the switching mechanism disconnection by the output signal of electric-leakage detection circuit 7.Here, electric-leakage detection circuit 7 as its control power supply by and main circuit 1 between the power line 9, the voltage between phases that rectification circuit 10 is supplied with main circuit 1 laid.Wherein, though in illustrated example, supply with the voltage between phases of the R-T phase of main circuit 1 to electric-leakage detection circuit 7,, also have earlier each phase voltage of R, S, T phase to be transformed into situation about supplying with again behind the direct current.

On the other hand, in Fig. 4, Fig. 5, the 11st, the main body case that constitutes by lower tank 11a and

upper cap

11b, 12, the 13rd, the main circuit terminal of power supply one side, load one side, the 14th, the fixedly contact element of main contact 2 (referring to Fig. 3), the 15th, movable contact element, the 16th, the contact element retainer of support movable contact element 15, the 17th, explosion chamber.In addition, as people are known, switching mechanism 3 is the elbow section rod mechanisms that are made of with opening and closing spring 3b the elbow connection rod 3a that is connected between above-mentioned contact element retainer 16 and the operating grip 4, and combination latch 18, latch receiver 19, disconnecting cross bar 20 and the assembly of the stop pin mechanism that constitutes constitutes, the operating side of above-mentioned overcurrent release device 5 and disconnection cross bar 20 are in opposite directions.In addition, illustrated stop pin mechanism is an example, and in addition people also know the stop pin mechanism of various structures.

In addition, as shown in Figure 5, assemble the parts of each phase by the mode that on main body case 11, forms alternate next door 11c, then, for electric-leakage detection circuit 7, it is built in the inside (space between zero phase current transformer 6 and the case sidewall) of main body case 11 with printed circuit board, then, power line 9 (referring to Fig. 3) is laid between the conductor of itself and main circuit 1.

The on-off action of above-mentioned electric-leakage detection circuit is well-known, promptly, when with operating grip 4 move operations on ON (opening) or OFF (closing) position the time, the action of reversing of the elbow section rod mechanism of switching mechanism 3, movable contact element 15 carries out on-off action with operating grip 4 interlocks.In addition, under the illustrated input state of closed (ON), latch 18 is restrained by disconnecting cross bar 20 in this position with latch receiver 19 engagements, latch receiver 19 at main contact 2.When this state makes overcurrent release device 5 action because of flow through electric current main circuit, disconnect cross bar 20 by its operating side and rotate in the counterclockwise direction, thereby discharge the engagement between latch receiver 19 and the latch 18.Therefore, switching mechanism 3 disconnects action, and make movable contact element 15 break away from by its elastic force that opens and closes spring 3b and come from fixing contact element 14, thus the electric current of disconnection main circuit.Equally, earth current flows in the main circuit 1 of Fig. 3, and it is detected, and when striping coil unit 8 moved by the output of electric-leakage detection circuit 7, its actuator made and disconnects the off-position that cross bar 20 is driven into latch.Thereby switching mechanism 3 disconnects action, and movable contact element 15 disconnects, thereby main circuit 1 is opened circuit.Wherein, after disconnecting action, in order to drop into circuit breaker once more, can adopt the operating grip 4 that will stop on the open position temporarily to turn back to the OFF position from open position resets stop pin mechanism, then, make operating grip 4 move to the locational way of ON again, make movable contact element 15 put into make position from OFF.

Above-mentioned residual current circuit breaker stipulates to possess the insulation endurance of regulation in technical specification, for this reason, regulation will all be carried out withstand voltage test to confirm not produce insulation breakdown to each product.This withstand voltage test is defined as under the main contact 2 that makes residual current circuit breaker becomes state for OFF, the alternate way that applies electrical leakage voltage from from the outside to main circuit terminal 13 is carried out, this test voltage is by each rated voltage defined of residual current circuit breaker, for example, be that test voltage under the situation of residual current circuit breaker of 400～600V is 2500V in rated voltage.

Yet, under the situation of implementing this withstand voltage test, when carrying out withstand voltage test under the assembled state of the product of the power line 9 that is laid with electric-leakage detection circuit shown in Figure 37 main circuit 1 alternate, owing to will test voltage be imposed on electric-leakage detection circuit 7 by power line 9, testing circuit might suffer that voltage destroys with maintaining the original state.So, for (Japan) domestic producer, present stage is to be defined as in the assembling procedure of residual current circuit breaker, will carry out withstand voltage test to the assembling stage that the power line 9 of electric-leakage detection circuit 7 power supplies is laid before being connected to main circuit 1, and then connect power line 9 and shipping product.

On the other hand, residual current circuit breaker in European and American countries production, different with previous said unibody construction, generally be that use combines the independent independently detection of electrical leakage unit of structure the option product of zero phase current transformer, electric-leakage detection circuit etc. and blocking (on the equipment).In addition, for the user can carry out above-mentioned withstand voltage test under the state that the detection of electrical leakage unit is combined on the Inturruptor for sub-line, people know such technology: promptly, use switching equipment on the detection of electrical leakage unit proof voltage test, when carrying out withstand voltage test, by manual operation the proof voltage test is become with switch and be OFF, cut off electric-leakage detection circuit with main circuit from Inturruptor for sub-line, after withstand voltage test finishes, proof voltage test is carried out recovery operation with switch be ON, thereby turn back to usual user mode (for example, with reference to patent documentation 2).

On the other hand, in by the previous institute of same patent applicant of the present invention proposition technology (referring to patent documentation 3), it constitutes: for Fig. 4, the residual current circuit breaker of unibody construction type shown in Figure 5, for the correspondence withstand voltage test that the user carries out after the product delivery, also in advance the proof voltage test is installed to the main body case inside of residual current circuit breaker with switches set, ON with the main circuit contact of circuit breaker, the OFF action is connected linkedly, cut off the power supply circuits of electric-leakage detection circuit 7 shown in Figure 3, perhaps when implementing withstand voltage test when by after manually coming OFF to operate above-mentioned proof voltage to test with switch, forcibly make the main contact of residual current circuit breaker disconnect action linkedly with it.

No. 3246562 specification of [patent documentation 1] special permission

[patent documentation 2] U.S. Patent Application Publication 2001/0022713A1 specification

[patent documentation 3] spy opens the 2004-199881 specification

Summary of the invention

Yet; product for the residual current circuit breaker of above-mentioned monomer structure; unified for the distribution residual current circuit breaker be same overall dimension; and as shown in Figure 5; inside at main body case does not almost have remaining space; assembled overcurrent protection and earth leakage protective functional part densely, above-mentioned proof voltage test has not been appended with switch and be assembled into main body case volume inside surplus.For this reason, want the proof voltage test is built in the main body case with switch, on design aspect, just become change significantly for the maximization that needs main body case and various functional part, layout, especially for residual current circuit breaker, because Inturruptor for sub-line and critical piece are shared, spend the problem of a large amount of fee to develop and time with regard to needs so exist for design alteration significantly.

The present invention finishes in view of above-mentioned aspect, its purpose is to provide a kind of residual current circuit breaker, existing residual current circuit breaker is only needed the some a little changes of main body case need not be changed its internal structure, for the client that will after user's one side is being provided with, implement withstand voltage test, when the product delivery of residual current circuit breaker or after the delivery, the proof voltage test is installed on the breaker body with switches set, even if make, carry out withstand voltage test safely thereby also can cut off electric-leakage detection circuit from main circuit by shirtsleeve operation at the application target scene.

To achieve these goals,, in main body case, be built-in with main contact, switching mechanism, operating grip, overcurrent release device and comprise in the residual current circuit breaker of electric leakage releasing device of electric-leakage detection circuit according to the present invention,

Connect, cut off the residual current circuit breaker that switch is used in the proof voltage test that is laid in the power supply circuits between described electric-leakage detection circuit and the main circuit as having with manual manipulation mode, the test of this proof voltage is with switch conduct peripheral hardware switch and being installed on the case side of breaker body independently, when carrying out the withstand voltage test of residual current circuit breaker, described proof voltage test is carried out shutoff operation with switch, thereby make electric-leakage detection circuit disconnect (first aspect of invention) from main circuit, specifically, can implement, constitute by following manner.

(1) above-mentioned proof voltage test is the diverter switch of alternation action type with switch, be push operation portion and make contact remain on make position at ordinary times, last pulling process by operating portion disconnects contact, and, outside with this switch, be located under the state on the main body case, at this operating portion and be installed to carry out between the disconnection cross bar on the switching mechanism of breaker body mechanical interlocked, with the shutoff operation of switch described disconnection cross bar is driven into the latch off-position by the proof voltage test, the main circuit contact is disconnected, simultaneously, will disconnect cross bar and be locked in latch off-position (second aspect of invention).

(2) in preceding paragraph (1), as the interlock of using in the proof voltage test between switch and the disconnection cross bar, the actuator that is connected and is driven in ON, the OFF operation of this switch with the proof voltage test with the operating portion of switch is set, be located at outside with this switch under the state on the breaker body, the top of described actuator is connected (third aspect of invention) with the cut-off push button of standard facility on breaker body.

The effect of invention

In the above-described configuration, outside testing proof voltage with switch, install on the main body case of circuit breaker, and the wiring of this switch is connected under the user mode between electric-leakage detection circuit and the main circuit, usually the operating portion that proof voltage is tested with switch is pressed to Closing Switch contact on the ON position, supplies with the voltage between phases of main circuit to electric-leakage detection circuit by this switch.On the other hand, when implementing the withstand voltage test of residual current circuit breaker, when when manually making proof voltage test switch on the OFF position with the operating portion of switch, thereby closed the making between electric-leakage detection circuit and the main circuit of make and break contact cuts off, simultaneously, with this OFF operation interlock, the disconnection cross bar of breaker body is driven on the latch off-position, switching mechanism disconnects action, disconnects main contact.Therefore, even if being ready to complete of withstand voltage test applies test voltage and carry out withstand voltage test between the main circuit terminal of breaker body, also can protect electric-leakage detection circuit safely.

In addition, when OFF operates the test of above-mentioned proof voltage and use switch, interlock disconnection cross bar on the operating portion of this switch by actuator, cut-off push button and be locked on the latch off-position and remained on this position by contained.Therefore, be under the OFF state in proof voltage test with switch, even plan by lever operated drops into to be in disconnect the residual current circuit breaker of moving, also can fail to reset and can not make the main contact closure because of the disconnection cross bar.Therefore; just can prevent that finishing the back in withstand voltage test unchangeably makes the main contact closed faulty operation that make residual current circuit breaker turn back to user mode with switch in the original state that keeps cutting off electric-leakage detection circuit from main circuit because of forgetting the test of connection proof voltage, and in use the ground connection of residual current circuit breaker is detected, earth leakage protective can not play a role such fault because of this operate miss causes.

And, because proof voltage test is adorned switch (external attached device) and is installed to outward on the main body case of residual current circuit breaker as independently outer with switch, thus can the supplementing device proof voltage test the common component that need not change Inturruptor for sub-line and residual current circuit breaker with switch with and layout.In addition, there be not the user of attached proof voltage test originally for buying with the residual current circuit breaker of the product of switch, after being provided with, be necessary regularly to carry out under the situation of withstand voltage test, by adopt from producer buy and outside adorn the way of proof voltage test with switch, just can carry out the withstand voltage test of residual current circuit breaker in user's one side.

Description of drawings

Fig. 1 is the structure chart of the residual current circuit breaker of embodiments of the invention, (a) is the stereogram of proof voltage being tested the state on the breaker body that installs to switch outward, (b) is circuit diagram.

Fig. 2 is the operating instruction figure that switch is used in the proof voltage test among Fig. 1, and (a) and (b) illustrate respectively the proof voltage test is arrived the locational state of ON, OFF with switching manipulation.

Fig. 3 is the circuit diagram of existing residual current circuit breaker.

Fig. 4 is the section of structure of residual current circuit breaker.

What Fig. 5 represented is the in-built stereogram of Fig. 4.

The number in the figure explanation

1: main circuit, 2: main contact, 3: switching mechanism, 4: operating grip, 5: overcurrent release device, 7: electric-leakage detection circuit, 11: main body case, 14: fixing contact element, 15: movable contact element, 20: disconnect cross bar, 22: proof voltage test switch, 22a: operating handle, 22c: actuator, 23: cut-off push button

Embodiment

Below, based on Fig. 1, embodiment shown in Figure 2 embodiments of the present invention are described.In illustrated embodiment, shown in the circuit diagram of Fig. 1 (b), the proof voltage test is connected on electric-leakage detection circuit (the IC circuit) 7 and the power supply circuits between the main circuit 1 that is laid in residual current circuit breaker with switch 22, when carrying out withstand voltage test, the proof voltage test is carried out shutoff operation with switch 22 so that electric-leakage detection circuit 7 disconnects from main circuit 1, thereby test voltage can be applied on the electric-leakage detection circuit 7.

,, shown in Fig. 1 (a),, be located at the side of the main body case 11 of residual current circuit breaker outward and use with switch 22 for this proof voltage test, below its structure is elaborated as the outer dress switch that separates independently manual operation formula with breaker body.

Promptly, the proof voltage test is equipped with operating handle 22a with switch 22 on case, it is a kind of diverter switch of alternation action type, like that, when operating handle 22a was pushed, make and break contact just became for ON (opening) shown in Fig. 2 (a), in addition, like that, when operating handle 22a being pulled on (operating handle is moved to instruments such as screwdrivers case above), make and break contact just becomes for OFF (closing) shown in Fig. 2 (b).In addition, in order to use this proof voltage test switch 22, need to carry out like that as shown in the figure distribution, make and to be located at outside after the case side of breaker body, with the power line 9 shown in Fig. 1 (b) be connected to its external connection terminals 22b go up and be inserted into breaker body electric-leakage detection circuit 7 and and main circuit 1 between.

In addition, as shown in Figure 2, the proof voltage test is provided with the actuator 22c of claw outstanding knee-action formula from the case side towards breaker body with switch 22.This actuator 22c combines with aforesaid operations handle 22a hinge, and the opening operation by switch retreats the claw position of readiness upward of actuator 22c, drives claw linkedly with shutoff operation downwards from position of readiness.In addition, outside testing proof voltage with switch 22, be located under the state on the breaker body, with with the cut-off push button interlocking of above-mentioned actuator 22c standard facility on the residual current circuit breaker, as described below, the shutoff operation that interlock is tested with switch 22 in proof voltage presses down cut-off push button, makes residual current circuit breaker disconnect action.

Promptly, release movement for the switching mechanism of testing residual current circuit breaker, need shown in Fig. 1 (a) such, cut-off push button 23 standards are installed on the case lid 11b of main body, this cut-off push button 23 is connected (with reference to Fig. 2) with the disconnection cross bar 20 of switching mechanism, to disconnect cross bar 20 by pressing down cut-off push button 23 and drive (counterclockwise), thereby circuit breaker is disconnected to the latch off-position.

Therefore, in the illustrated embodiment, shown in Fig. 1 (a), from cut-off push button 23 to the outstanding motion arm 23a in side towards the window of offering in the side of case lid 11b, outside testing with switch 22, proof voltage is contained under the state of above-mentioned breaker body, as shown in Figure 2, make top claw and the aforesaid operations arm 23a face-off of above-mentioned actuator 22c.

In said structure, under the state of the switch ON (opening) that proof voltage test is pushed into the operating handle 22a of switch 22 (referring to Fig. 2 (a)), actuator 22c retreats into the position of readiness of top, to not interference of cut-off push button 23.Therefore, if under this state, the operating handle 4 of breaker body is put into ON (opening) position, then can supply with the voltage between phases of main circuit to electric-leakage detection circuit with switch 22 by the proof voltage test.

Coming into effect from this state under the situation of withstand voltage test, will pull proof voltage test with the operating handle 22a of switch 22 as its preparation process and close (OFF) and operate (referring to Fig. 2 (b)).Therefore, will become the electric-leakage detection circuit that cuts off circuit breaker for OFF from main circuit with switch 22 because of the proof voltage test, simultaneously, actuator 22c also can be driven in the closing (OFF) operation of this operating handle 22c and cut-off push button 23 is pressed down, and is driven into the latch off-position thereby will disconnect cross bar 20.Its result, become for make switching mechanism 3 disconnect the action disconnect main contact, thereby finished the first position of withstand voltage test.Wherein, under this state, because disconnecting cross bar 20 is locked in the latch off-position with the actuator 22c of switch by cut-off push button 23, proof voltage test, even if transfer to OFF (closing) position from open position so make the operating grip 4 of residual current circuit breaker, switching mechanism 3 can not reset yet, so can not drop into main contact 1 mistakenly in withstand voltage test.

Then, after withstand voltage test finished, when when manually being pushed into ON (open) position on the operating handle 22a of switch 22 the proof voltage test, shown in Fig. 2 (a), actuator 22c removed the contained of cut-off push button 23.Therefore, turn back to reset position earlier by the handle 4 that makes the circuit breaker that stops at open position from this state and drop into the ON position again, and make the main circuit junction closure, thereby residual current circuit breaker turns back to common user mode.Wherein, after withstand voltage test finishes, as described above because as long as do not make the proof voltage test turn back to ON (opening) position with the operating handle 22a of switch 22, just can not drop into the main contact of operating breaker main body, therefore just can prevent because of forgetting that connecting the proof voltage test causes the ground connection detection of residual current circuit breaker such fault that can not play a role with operate miss that switch 22 causes.

In addition, even if do not have the user of attached proof voltage test with the residual current circuit breaker of the product of switch for buying originally, after being provided with, regularly carry out the situation of withstand voltage test if desired, only need to buy external attached device (option product) and the proof voltage test of preparing is located on the breaker body outside also with switch as residual current circuit breaker from producer, and make with respect to the power line 9 of electric-leakage detection circuit and lay the state that replaces to Fig. 1 (b) from the state of Fig. 3, just can carry out the withstand voltage test of residual current circuit breaker in user's one side.

Claims

1. residual current circuit breaker, the electric leakage releasing device that is built-in with main circuit contact, switching mechanism, operating grip, overcurrent release device and comprises electric-leakage detection circuit in main body case is characterized in that:

Connect, cut off the residual current circuit breaker that switch is used in the proof voltage test that is laid in the power supply circuits between described electric-leakage detection circuit and the main circuit as having with manual manipulation mode, the test of this proof voltage is with switch conduct peripheral hardware switch and be installed in the case side of breaker body independently, when carrying out the withstand voltage test of residual current circuit breaker, described proof voltage test is carried out shutoff operation with switch, and electric-leakage detection circuit is disconnected from main circuit

The proof voltage test is the diverter switch of alternation action type with switch, be push operation portion and make proof voltage test remain on make position at ordinary times with the contact of switch, last pulling process by operating portion makes the proof voltage test disconnect with the contact of switch, and, outside with this switch, be located under the state on the main body case, at this operating portion and be installed to carry out between the disconnection cross bar on the switching mechanism of breaker body mechanical interlocked, with the shutoff operation of switch described disconnection cross bar is driven into the latch off-position by the proof voltage test, the main circuit contact is disconnected, simultaneously, will disconnect cross bar and be locked in the latch off-position.

2. residual current circuit breaker according to claim 1 is characterized in that:

As the interlock of using in the proof voltage test between switch and the disconnection cross bar, be provided with proof voltage and test the actuator that operating portion with switch is connected and is driven in the opening of this switch, shutoff operation, be located at outside with this switch under the state on the breaker body, the top of described actuator is connected with cut-off push button on being equipped in breaker body.