CN1046055C - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
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- CN1046055C CN1046055C CN95105294A CN95105294A CN1046055C CN 1046055 C CN1046055 C CN 1046055C CN 95105294 A CN95105294 A CN 95105294A CN 95105294 A CN95105294 A CN 95105294A CN 1046055 C CN1046055 C CN 1046055C
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- neutral
- current path
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency 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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency 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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency 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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/338—Emergency 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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers also responsive to wiring error, e.g. loss of neutral, break
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Breakers (AREA)
- Emergency Protection Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Circuit interruption is executed in the event of faulty connection of a distribution line, thereby improving safety. Contacts 3, which are opened and closed by drive mechanism 4, are inserted in a main current path between power-supply-side terminal area 1 and load-side terminal area 2. Neutral-line potential response means 10 between legs of the main current path are equipped with a series circuit containing energizing coil 12 and thyristor SCR1, while resistor R2, capacitor C1, and diode D2 are connected in parallel across the gate and cathode of thyristor SCR1. Furthermore, resistor R2 is connected through Zener diode ZD to main-current-path neutral-line-side lead N. In the event of reversal of live and neutral connections, or an open neutral, a potential difference is generated between neutral-line-side lead N and ground connection area 7. As a result, Zener diode ZD passes current, turning ON thyristor SCR1 and opening contacts 3. The circuit also responds to excessive current, and may include an earth leakage detection transformer.
Description
The present invention relates to a kind of circuit breaker, inserted contact in its main current path, abnormal current flows through main current path can force to disconnect this contact.
Classify from broad sense, this class circuit breaker comprises following several traditionally: the circuit breaker of protection circuit or protection motor even load, this class circuit breaker is provided with driving mechanism, it is in response to overcurrent, as because the electric current that flows through main current path that short circuit or overload cause and forced cut-out contact; Be the circuit breaker that prevents to leak electricity, it is provided with a driving mechanism, detect the output that the leakage current such as leakage current or earth fault current etc. that flows through main current path produces according to the zero phase current transformer, force breaking-off contact, the circuit breaker that has above-mentioned two kinds of functions simultaneously.This circuit breaker adapts to different application scenarios.
Fig. 7 shows the structure of traditional circuit breaker.The main current path that forms is in the side zone 2 of its load and have between the supply side end regions 1 of voltage line end 1a and neutral terminal 1b and insert contact 3, and the pressure-wire of distribution wire links to each other with this contact 3 respectively with the neutral line.When having short circuit current to flow through main current path in order to excitation driving mechanism 4 and force excitation coil 5 that contact 3 opens and flow through the heat that the overload current of main current path produces and encourage the thermorelay 6 of driving mechanism to be inserted in the pressure-wire side lead L of main current path in order to detection, and being provided with zero phase current transformer CT, its primary side is a main current path.The primary side of zero phase current transformer CT is connected on the controller 20, controller 20 has integrated circuit 21, and when (being the primary side of zero phase current transformer CT) in the main current path mobile electric current owing to having leakage current to become imbalance, an output can occur in primary side, the output of this zero phase current transformer CT is input to controller 20.The integrated circuit 21 of controller 20 is to be connected the full-wave rectified voltage operation of the diode bridge DB output between the main current path branch line by magnet exciting coil 12.In controller 20 inside, when the output of zero phase current transformer CT surpasses setting, controllable silicon SCR
2Conducting.This controllable silicon SCR
2Connecting with magnet exciting coil 12 is inserted in the main current path, in order to excitation driving mechanism 4.Work as SCR
2During conducting, exciting current flows through magnet exciting coil 12, and excitation driving mechanism 4 also opens contact 3.And this circuit breaker also is provided with Test Switchboard 22.When Test Switchboard 22 is connected, force primary current to supply with zero phase current transformer CT, carry out test operation, make controller 20 excitation driving mechanisms 4, and open contact 3.
Now, in order to prevent abnormal voltage, the neutral line and the pressure-wire that the distribution wire that is connected to circuit breaker supply side end regions 1 are divided into ground connection, as mentioned above, corresponding with it, also the supply side petiolarea 1 of circuit breaker is divided into voltage line end 1a that is connected on the pressure-wire and the neutral terminal 1b that is connected on the neutral line.In addition, when distribution wire is connected to circuit breaker, must correctly be connected to the pressure-wire in the distribution wire on the voltage line end 1a of supply side end regions 1, the neutral line in the distribution wire is connected on the neutral terminal 1b.
Yet, have such danger, that is, when distribution wire was connected circuit breaker, the attendant may be the pressure-wire misconnection to the neutral terminal 1b of circuit breaker, and neutral line misconnection to the voltage line end 1a of circuit breaker.This problem can produce this possibility, and promptly under the situation of this incorrect link, circuit breaker may no longer be realized the function of its regulation.
The objective of the invention is to address the above problem.Therefore, the present invention tries hard to provide a kind of circuit breaker, in this circuit breaker, also can interrupt circuit under the situation of distribution wire wrong, thus improved fail safe.
To achieve these goals, circuit breaker provided by the invention comprises:
The power supply petiolarea that links to each other with the distribution wire of forming by the pressure-wire and the neutral line, described power supply petiolarea is made of with the neutral end that links to each other with the described neutral line the voltage line end that links to each other with described pressure-wire;
The load petiolarea that links to each other with load;
From pressure-wire and neutral main current path that described voltage line end and neutral end extend to described load petiolarea respectively, described pressure-wire main current path has the contact that sets within it;
Driving mechanism can be opened described contact when one of short circuit current and overload current flow through the pressure-wire main current path having detected, and disconnects described main current path;
Be provided with neutral line voltage response device, detect leave described contact on the described neutral main current path and near the point of described load end and with earth terminal that extraneous ground wire is connected between voltage difference, described device encourages described driving mechanism in described detected voltage difference during greater than predetermined value, opens the contact of described pressure-wire main current path;
It is characterized in that described neutral main current path (N) is provided with contact in it, described driving mechanism flows through pressure-wire main circuit path and opens the contact of main current path in both in response to detecting short circuit current or overload circuit.
At circuit breaker of the present invention, with the switch element excitation coil that encourages described driving mechanism that is connected in series, described switch element leaving described contact on the described pressure-wire main current path near between the point and described earth terminal of described load end, when the described contact of the degree of bias of described neutral main current path and when the point of described load end and the voltage difference between the described earth terminal become greater than predetermined value, described switch element conducting.
At circuit breaker of the present invention, also comprise the zero phase current transformer, detect such as leakage currents such as short circuit current or leakage currents, and an output is provided when detecting described leakage current;
Described driving mechanism is opened described two contacts, to disconnect described main current path in response to the output of described zero phase current transformer;
Neutral line voltage response device is set, detect leave described contact on the described neutral main current path and near the point of described load petiolarea and with earth terminal that outside ground wire is connected between voltage difference, when the voltage difference of described detection becomes greater than predetermined value, described device provides pseudo-leakage current, encourages described driving mechanism;
With the switch element excitation coil that encourages described driving mechanism that is connected in series, described switch element is at described contact of departing from of described pressure-wire main current path and between the point and described earth terminal of described load end, when described contact of departing from of described neutral main current path and when the point of described load petiolarea and the voltage difference between the described earth terminal become greater than predetermined value, described switch element conducting.
In the structure of the invention described above, since be provided with the access area that links to each other with extraneous ground wire and when the neutral terminal of supply side end regions and the potential difference between this access area during above setting in order to encourage driving mechanism to open the neutral line potential response device of contact, so, under the situation of the supply side end regions that the distribution wire misconnection is arrived circuit breaker, between the neutral terminal of access area and supply side end regions, there is a potential difference above setting, thereby make neutral line potential response device excitation driving mechanism, logical contact is opened, disconnected main current path.
In above-mentioned structure another kind of of the present invention, owing to be provided with the access area that links to each other with extraneous ground wire and when the neutral terminal of supply side end regions and the potential difference between this access area surpass regulation, on the zero phase current transformer, produce the simulation leakage current and encourage driving mechanism and simulate the leakage current generating device, so under the situation of the supply side end regions that the distribution wire misconnection is arrived circuit breaker, between the neutral terminal of access area and supply side end regions, there is a potential difference above setting, thereby simulation leakage current generating means makes the zero phase current transformer produce output, the excitation driving mechanism, force contact to be opened, disconnect main current path.
In above-mentioned structure of the present invention, owing between the voltage line end of access area and supply side end regions, be provided with a series connection circuit, this series circuit includes magnet exciting coil and switch element that encourages driving mechanism, switch element conducting when the potential difference between the neutral terminal of access area and supply side end regions surpasses setting, when the open-wire line in the neutral path appears at the supply side of supply side end regions or appear at neutral line potential response device or simulate the supply side of electric leakage generation device, as long as distribution wire correctly is connected to the supply side end regions of circuit breaker, between access area and neutral terminal, just there is potential difference, generation one flows to the electric current of access area by load from the pressure-wire side lead of main current path, thereby make the switch element conducting, provide electric current to magnet exciting coil, make the magnet exciting coil energising, the excitation driving mechanism is opened contact.Therefore, when connection is correct, if the neutral line disconnects, contact is opened, main current path disconnects, thereby, the fail safe of circuit breaker is improved.
In above-mentioned the present invention, the circuit breaker that forms, main current path is in its load side end zone and have between the supply side end regions of the voltage line end of the pressure-wire that is connected respectively to distribution wire and the neutral line and neutral terminal and insert contact, the driving mechanism of circuit breaker equipment is opened contact and is disconnected main current path when short circuit or overload current flow through main current path having detected, since the present invention also be provided with the access area that is connected to extraneous ground wire and when the neutral terminal of supply side end regions with the potential difference between this access area during above setting in order to encourage driving mechanism and to open the neutral line potential response device of contact, therefore effect of the present invention is under the situation of the supply side end regions that the distribution wire misconnection is arrived circuit breaker, between the neutral terminal of access area and supply side end regions, produce a potential difference above setting, thereby make neutral line potential response device excitation driving mechanism, force contact to be opened, disconnect the main circuit path, thereby under misconnection ground situation, guarantee safety, the misconnection situation takes place in the time of can preventing wiring.
In the circuit breaker that above-mentioned the present invention forms; main current path is in its load side end zone and have between the supply side end regions of the voltage line end of the pressure-wire that is connected respectively to distribution wire and the neutral line and neutral terminal and insert contact; circuit breaker is equipped with in order to detection contact when closed such as leakage current such as leakage current that flows through main current path or earth fault current and zero phase current transformer with in response to the output of this zero phase current transformer opens the driving mechanism that contact disconnects main current path; because the present invention also is provided with the access area that is connected to extraneous ground wire and produces the simulation leakage current generating device that the simulation leakage current encourages driving mechanism when the neutral terminal of supply side end regions and the potential difference between this access area surpass setting on the zero phase current transformer; therefore; effect of the present invention is under the situation of the supply side end regions that the distribution wire misconnection is arrived circuit breaker; between the neutral terminal of access area and supply side end regions, produce a potential difference above setting; therefore; simulation leakage current generating device makes the zero phase current transformer produce output; the excitation driving mechanism; force contact to be opened; and disconnection main current path; thereby under situation, protect safety in misconnection, the misconnection situation takes place in the time of can preventing wiring.
In above-mentioned structure of the present invention, owing between the voltage line end of access area and supply side end regions, be provided with a series connection circuit, this series circuit includes magnet exciting coil and switch element that encourages driving mechanism, switch element conducting when the potential difference between the neutral terminal of access area and supply side end regions surpasses setting, therefore effect of the present invention is to disconnect when the supply side of neutral line path at the supply side end regions, perhaps, when neutral line path disconnects at the supply side of neutral line potential response device or simulation leakage current generating device, as long as distribution wire correctly is connected to the supply side end regions of circuit breaker, just order produces potential difference between access area and neutral terminal, generation one flows to the electric current of access area by load from the pressure-wire side lead of main current path, thereby switch element is connected, provide electric current to magnet exciting coil, make the magnet exciting coil energising, the excitation driving mechanism is opened contact.Therefore, when connection is correct,, disconnect main current path, thereby improved the fail safe of circuit breaker if neutral line open circuit also can be opened contact.
Fig. 1 shows the circuit structure of first embodiment.
Fig. 2 shows the circuit structure of second embodiment.
Fig. 3 shows the circuit structure of the 3rd embodiment.
Fig. 4 shows another example of the foregoing description major part.
Fig. 5 shows the circuit structure of the 4th embodiment.
Fig. 6 shows the circuit structure of the 5th embodiment.
Fig. 7 shows the circuit structure of an example of correlation technique.
＜the first embodiment 〉
Fig. 1 shows the circuit structure of present embodiment circuit breaker.This circuit breaker belongs to so-called 2P1E type, in the main current path that this circuit breaker forms, at load-side petiolarea 2 with have between the supply side end regions 1 of the voltage line end 1a of the pressure-wire that is connected respectively to distribution wire and the neutral line and neutral terminal 1b and insert contact 3 with a pair of load link 2a and 2b, and in the pressure-wire side lead L of main current path, inserted when having electric current to flow through main current path, and force excitation coil 5 that contact 3 opens and flow through heat that the overload current of main current path produces and the thermorelay 6 that encourages driving mechanism 4 in order to detection in order to excitation driving mechanism 4 because of short circuit.Again, driving mechanism 4 has a kind of well-known structure, and it is furnished with one handle 4a, is used for manual unlocking and closes joint 3.
And this circuit breaker also is provided with the access area 7 that links to each other with extraneous ground wire, and the neutral line potential response device 10 of setting is connected to the load-side of contact 3 between main current path and access area 7.
Neutral line potential response device 10 is equipped with pressure-wire side 11a, neutral line side 11b and earth terminal 11c, and they are connected respectively to the access area 7 of main current path voltage side lead L, neutral line side lead N.Include diode D3, magnet exciting coil 12 and controllable silicon SCR
1Series circuit be connected between pressure-wire side 11a and the earth terminal 11c.In addition, comprise diode D
4, resistor R
1, diode D
1, Zener diode ZD and resistor R
2Series circuit and magnet exciting coil 12 and at earth terminal 11c and diode D
3And the controllable silicon SCR between the tie point of magnet exciting coil 12 is connected in parallel.And, resistor R
2Two ends by comprising capacitor C
1With diode D
2Middle parallel circuits be connected to controllable silicon SCR
1Grid and negative electrode.Moreover, controllable silicon SCR
1Anode pass through resistor R
3Be connected to diode D
4Positive pole.Between pressure-wire side 11a and neutral line side 11b, connect two surge absorber ZN
1And ZN
2, they are connected across on the magnet exciting coil 12, connect a surge absorber ZN between neutral line side 11b and earth terminal 11c
3
Below, we describe the working condition of neutral line potential response device 10.At first, the voltage line end 1a and the neutral terminal 1b of the supply side end regions 1 that correctly is connected to circuit breaker as the pressure-wire and the neutral line of distribution wire, then between the pressure-wire side 11a of neutral line potential response device 10 and neutral line side 11b, there is potential difference hardly, because neutral earthing.Therefore, because Zener diode ZD does not have electric current to flow through, controllable silicon SCR
1, remain off does not have electric current to flow through in the magnet exciting coil 12, and driving mechanism 4 is excited target not.Yet in this state, if because short circuit or mistake carrier electric current flow through main current path, excitation coil 5 and thermorelay 6 will encourage driving mechanism 4, and contact 3 is opened.
On the other hand, if the pressure-wire of distribution wire and the neutral line are distinguished voltage line end 1a and the neutral terminal 1b of reversal connection to the supply side end regions 1 of circuit breaker owing to misconnection, the neutral line side lead N that should be connected to the main current path of the neutral line according to reason has been connected on the pressure-wire, the result, the potential difference that exists between neutral line side lead N and access area 7, also appearance potential is poor between the neutral line side 11b of neutral line potential response device 10 and earth terminal 11c.If this potential difference is greater than Zener voltage, then Zener diode ZD has electric current to flow through, and makes controllable silicon SCR
1Conducting.Work as controllable silicon SCR
1During conducting, pass through controllable silicon SCR
1Between end of magnet exciting coil 12 and access area 7, form a conductive path.As a result, electric current is along neutral line side 11b-diode D
4-magnet exciting coil 12-controllable silicon SCR
1This path flow of-earth terminal 11c, excitation driving mechanism 4 is opened contact 3, disconnects main current path.
In the pressure-wire of distribution wire and neutral line misconnection under the situation of the voltage line end 1a of the supply side petiolarea 1 of circuit breaker and neutral terminal 1b, neutral line potential response device 10 will encourage driving mechanism 4, open contact 3, thereby open circuit, prevented from supply power voltage to be offered load-side because of misconnection, adopt said structure, can prevent from when connecting distribution wire, to meet accident.
＜the second embodiment 〉
Fig. 2 shows the circuit structure of present embodiment circuit breaker.As shown in Figure 2, the example of the basic circuit structure of this circuit breaker and correlation technique shown in Figure 7 is basic identical.The consistent sign flag of total element, and omitted description of them, description in addition only limits to those elements that belongs to the present embodiment feature.
As among first embodiment, present embodiment also is provided with access area 7, and it is received on the extraneous ground wire.Surge absorber ZN
3With comprise resistor R
1, diode D
1, Zener diode ZD and resistor R
2Series circuit be connected between the neutral line side lead N of this access area 7 and main current path.And, resistor R
2Two ends pass through resistor R
4Be connected on the LED, LED includes optical coupler PC.
Again, in controller 20 inside, the magnet exciting coil 12 and the controllable silicon SCR of series connection with it '
2Not only can trigger, also can trigger by the light radiation of LED by grid voltage.Optical coupler PC is by LED and controllable silicon SCR '
2Constitute.
Below, we describe the operation of present embodiment circuit breaker.At first, distribution wire is correctly linked supply side end regions 1, and short circuit current or overload current can encourage driving mechanism 4 by one of magnet exciting coil 5 or thermorelay 6, open contact 3.In other words, can cause the imbalance of the electric current that flows in the primary side of zero phase current transformer CT such as leakage currents such as leakage current or earth fault currents, the level side produces output secondarily.At controller 20, the output that produces when the primary side of zero phase current transformer CT is during greater than setting, and integrated circuit 21 makes controllable silicon SCR '
2Conducting.As a result, electric current is along pressure-wire side lead L-magnet exciting coil 12-controllable silicon SCR '
2This path flow of-diode bridge DB--neutral line side lead N, excitation driving mechanism 4 is opened contact 3.And the action of Test Switchboard 22 also forces the primary current of zero phase current transformer CT to become uneven, with produce the same mode of leakage current, excitation driving mechanism 4 is opened contact 3.
On the other hand, if the pressure-wire of distribution wire and neutral line misconnection voltage line end 1a and neutral terminal 1b to supply side end regions 1, between the neutral line side lead N of main current path and access area 7, will there be potential difference, if this potential difference surpasses Zener voltage, then there is electric current to flow through among the Zener diode ZD, makes LED luminous.As a result, make controllable silicon SCR with the LED optical coupling '
2Conducting.Work as controllable silicon SCR '
2During conducting, electric current will pass through controllable silicon SCR '
2Flow to magnet exciting coil 12 with diode bridge DB, excitation driving mechanism 4 is opened contact 3.
As mentioned above, under the situation of distribution wire misconnection, the potential difference of present embodiment between neutral line side lead N and access area 7 makes an electric current flow through magnet exciting coil 12 during greater than the Zener voltage of Zener diode ZD.Therefore, neutral line potential response device 10 ' is made of the series circuit that comprises resistor R 1 and Zener diode ZD, optical coupler PC and magnet exciting coil 12.
＜the three embodiment 〉
Fig. 3 shows the circuit structure of present embodiment circuit breaker.As shown in Figure 3, the example of basic circuit structure of this circuit breaker and correlation technique shown in Figure 7 is basic identical.Total element is marked with consistent symbol, and has omitted description of them.
As first embodiment, the circuit breaker of present embodiment is provided with the access area 7 that is connected to extraneous ground wire, and the n1 of the elementary winding of zero phase current transformer CT is arranged between this access area 7 and the main current path neutral side lead N by resistor R 5.In addition, between access area 7 and neutral side lead N, insert surge absorber ZN
4
Below, we describe the working condition of present embodiment circuit breaker.At first, distribution wire correctly is connected to supply side end regions 1, and flow through one of excitation coil 5 or thermorelay 6 of short circuit or load current encourage driving mechanism 4, and contact 3 is opened.In other words, can cause the imbalance of the electric current that flows in the primary side of zero phase current transformer CT such as leakage currents such as leakage current or earth fault currents, and the level side produces output secondarily.At controller 20, when the output of the primary side of zero phase current transformer CT during greater than setting, integrated circuit 21 makes controllable silicon SCR
2Conducting.As a result, electric current is surveyed lead L-magnet exciting coil 12-controllable silicon SCR along pressure-wire
2This path flow of-diode bridge DB-neutral line side lead N, excitation driving mechanism 4 is opened contact 3.And the action of Test Switchboard 22 also forces the primary current of zero phase current transformer CT to become uneven, encourages driving mechanism 4 in the mode the same with producing leakage current, opens contact 3.
On the other hand, if the pressure-wire of distribution wire and neutral line misconnection voltage line end 1a and neutral terminal 1b to supply side end regions 1, between the neutral line side lead N of main current path and access area 7, will there be potential difference, so have electric current to flow through to be arranged on primary coil n1 between the two.Because the electric current that flows on elementary winding n1 makes the primary side of zero phase current transformer CT become uneven, thus output will be produced in the primary side of zero phase current transformer CT, and make the controllable silicon SCR of controller 20
2Conducting.Work as controllable silicon SCR
2During conducting, electric current passes through controllable silicon SCR
2With diode bridge DB, flow into magnet exciting coil 12, excitation driving mechanism 4 is opened contact 3.
Adopt under the situation of supply side end regions 1 said structure to produce output in the primary side of zero phase current transformer CT in the distribution wire misconnection by means of comprising the neutral line side lead N that is arranged on main current path and the simulation leakage current generating device of the elementary winding n1 of zero phase current transformer CT between the access area 7.Therefore, under the situation of above-mentioned misconnection, the primary side output that simulation produces on the zero phase current transformer CT that uses under the electric leakage situation is being arranged, making controller 20 excitation driving mechanisms 4, opening contact 3.In addition, as shown in Figure 4, can be in the resistor R of connecting with elementary winding n1
5The position on insert and to comprise resistor R 5, diode D5 and Zener diode ZD
2Series circuit.So, as long as the potential difference between neutral line side lead N and the access area 7 is not more than Zener diode ZD
2The Zener current potential, on the primary coil n1 of zero phase current transformer CT, just do not have electric current to flow.Therefore, when distribution wire correctly was connected to supply side end regions 1, the less potential difference that exists between neutral line side lead (path) N and the access area 7 can not produce electric current on primary coil n1, can prevent misoperation.
＜the four embodiment 〉
Fig. 5 shows the circuit structure of present embodiment circuit breaker.As shown in Figure 5, the example of the basic circuit structure of this circuit breaker and correlation technique and the 3rd embodiment are basic identical.Total element is marked with consistent symbol, and has omitted description of them, and description in addition only limits to this element that belongs to the present embodiment feature.
In the circuit breaker of present embodiment, controllable silicon SCR
3Be connected between the tie point of the input of magnet exciting coil 12 and diode bridge DB among access area 7 and the 3rd embodiment.And, between primary coil n1 and access area 7, insert resistor R
3The place inserted and comprised resistor R
3, diode D
4, Zener diode ZD
3And resistor R
5Series circuit.In addition, capacitor C2, diode D5 and controllable silicon SCR
3Grid and negative electrode respectively with resistor R
5The two ends parallel connection.
Below, we describe the working condition of present embodiment circuit breaker.By the way, because distribution wire correctly is connected to the situation of supply side end regions 1, identical with the 3rd embodiment in the working condition that has short circuit or overload current to flow or to flow with the example of prior art such as leakage currents such as electric leakage or earth faults, so omitted description of them at this.
Now, correctly be connected to the situation of supply side end regions 1 for distribution wire, the neutral line of distribution wire may be opened a way (disconnection) or be got loose with the supply side of supply side end regions 1, perhaps also may comprise magnet exciting coil 12 and controllable silicon SCR
3The supply side that is connected on that of main current path of series circuit disconnect.In this case, electric current will flow to access area 7 by load-side petiolarea 2 and the load that is connected to load-side petiolarea 2 from the pressure-wire side lead L of main current path.As a result, although do not power to the load, on load-side petiolarea 2, will produce potential difference.
When this potential difference exists, if this potential difference surpasses Zener diode ZD
3Zener voltage, then in controllable silicon SCR
3On apply grid voltage, make controllable silicon SCR
3Conducting, electric current is along the pressure-wire side lead L-magnet exciting coil 12-controllable silicon SCR of main current path
3-access area 7 these path flow, thus excitation driving mechanism 4 is opened contact 3.
When distribution wire correctly was connected to supply side end regions 1, the neutral line opened circuit or make electric current flow through magnet exciting coil 12 when analogue such as getting loose taking place to adopt said structure, can encourage driving mechanism 4, opens contact 3, therefore, can improve the fail safe of circuit breaker.
＜the five embodiment 〉
Above-mentioned first to fourth embodiment relates to the situation that distribution wire is a two-way, and the circuit breaker of present embodiment is applicable to distribution wire to be three tunnel situation.Fig. 6 shows the circuit structure of present embodiment.Because the basic structure of this circuit is the same with the structure of the 4th embodiment of 2 distribution wires,, and omitted description of them so the shared identical symbol of element ship is marked.
In the present embodiment, one in three distribution wires is the neutral line, and all the other two is pressure-wire.Amount at supply side petiolarea 1 and to be provided with three terminals, 2 voltage line end 1a and 1c and neutral terminal 1b.Equally, also be provided with three terminals at load-side petiolarea 2, the main circuit path of formation has 2 pressure-wire side lead L
1And L
2And a neutral line side lead N, contact 3 is inserted between them.Excitation coil 5 and thermorelay 6 are inserted in 2 pressure-wire side lead L respectively
1And L
2In.In addition, also be provided with zero phase current transformer CT, its primary side is a main current path.Test Switchboard 22 is inserted in 2 pressure-wire side lead L
1And L
2Between, surge absorber ZN
4Be inserted in pressure-wire side lead L
2And between the neutral line side lead N.
Resistor R
6With capacitor C
3And C
4Be connected in series between the input side of the magnet exciting coil 12 of controller 20 and diode bridge DB.And, in controllable silicon SCR
2And another controllable silicon SCR of connection between the end of magnet exciting coil 12
4This controllable silicon SCR
4Grid pass through resistor R
7Be connected to capacitor C
3With capacitor C
4Between tie point.Resistor R
8With capacitor C
5Be connected in controllable silicon SCR in parallel
4Grid and negative electrode on.
Below, we describe the working condition of present embodiment circuit breaker.At first, distribution wire correctly is connected to supply side end regions 1, and flow through one of excitation coil 5 or thermorelay 6 of short circuit or overload current encourage driving mechanism 4, open contact 3.In other words, produce unbalanced electric current such as the mobile meeting of electric leakage or leakage current such as earth fault current in the primary side of zero phase current transformer CT and flow, and the level side produces output secondarily.In controller 20, when the output of the primary side of zero phase current transformer CT during greater than setting, integrated circuit 21 makes controllable silicon SCR
2Conducting.Work as controllable silicon SCR
2During conducting, pass through resistor R
7To capacitor C
5Charging is added to controllable silicon SCR to voltage
4Grid on, make controllable silicon SCR
4Conducting.As a result, electric current is arranged along pressure-wire side lead L
1-magnet exciting coil 12-controllable silicon SCR
4-controllable silicon SCR
2-diode bridge DB-pressure-wire side lead L
2This path flow, excitation driving mechanism 4 is opened contact 3.The action of Test Switchboard 22 forces the primary current of zero phase current transformer CT to become uneven, the identical mode of leakage current below takes place encourage driving mechanism 4, opens contact 3.
On the other hand, when the pressure-wire of distribution wire and neutral line misconnection during to the voltage line end 1a of supply side petiolarea 1 and neutral terminal 1b, between the neutral line side lead N of main current path and access area 7, can there be a potential difference, thereby be arranged between the two the primary coil nl electric current will be arranged.Because the electric current that flows can cause the primary side imbalance of zero phase current transformer CT,, on controller 20, make controllable silicon SCR so produce output in the primary side of zero phase current transformer CT on elementary winding n1
2And SCR
4Conducting.As a result, there is electric current to pass through controllable silicon SCR
2And SCR
4And diode bridge DB flow to magnet exciting coil 12, and excitation driving mechanism 4 is opened contact 3.
And, as among the 4th embodiment,, open circuit or get loose from the supply side of supply side petiolarea 1 at the neutral line of distribution wire if distribution wire correctly is connected to supply side end regions 1, perhaps, the neutral line is from comprising magnet exciting coil 12 and controllable silicon SCR
3The supply side that is connected on that of main current path of series circuit disconnect, then have the voltage side lead L of electric current from main current path
1Flow to access area 7 by load side end 2 and the load that is connected to load-side petiolarea 2.As a result, on load-side petiolarea 2, produce potential difference, if this potential difference surpasses Zener diode ZD
3Zener voltage, controllable silicon SCR then
3On will add gate voltage, controllable silicon SCR
3Conducting makes the pressure-wire side lead L of electric current along main current path
1-magnet exciting coil 12-controllable silicon SCR
3-access area 7 these path flow, thus excitation driving mechanism 4 is opened contact 3.
Claims (3)
1. circuit breaker comprises:
The power supply petiolarea (1) that links to each other with the distribution wire of forming by the pressure-wire and the neutral line, described power supply petiolarea is made of with the neutral end (1b) that links to each other with the described neutral line the voltage line end (1a) that links to each other with described pressure-wire;
The load petiolarea (2) that links to each other with load;
Pressure-wire that extends to described load petiolarea respectively from described voltage line end and neutral end and neutral main current path (L, N), described pressure-wire main current path has the contact (3) that sets within it;
Driving mechanism (4) can be opened described contact when one of short circuit current and overload current flow through the pressure-wire main current path having detected, and disconnects described main current path (L);
Be provided with neutral line voltage response device, detect leave described contact (3) on the described neutral main current path (N) and near the point of described load end (2) and with earth terminal that extraneous ground wire is connected between voltage difference, described device encourages described driving mechanism (4) in described detected voltage difference during greater than predetermined value, opens the contact of described pressure-wire main current path (L);
It is characterized in that described neutral main current path (N) is provided with contact (3) in it, described driving mechanism flows through pressure-wire main circuit path and opens main current path (L, N) contacts in both in response to detecting short circuit current or overload circuit.
2. circuit breaker as claimed in claim 1 is characterized in that,
The excitation coil (12) that is connected in series one and encourages described driving mechanism (4) with switch element (SCR1), described switch element (SCR1) leaving described contact (3) on the described pressure-wire main current path (L) near between the point and described earth terminal (7) of described load end (2), when the described contact of the degree of bias of described neutral main current path (N) and when the point of described load end (2) and the voltage difference between the described earth terminal (7) become greater than predetermined value, described switch element conducting.
3. circuit breaker as claimed in claim 1 is characterized in that, also comprises zero phase current transformer (CT), detects such as leakage currents such as short circuit current or leakage currents, and an output is provided when detecting described leakage current;
Described driving mechanism (4) is opened described two contacts in response to the output of described zero phase current transformer, with disconnect described main current path (L, N);
Neutral line voltage response device (10 ') is set, detect and leave described contact on the described neutral main current path (N) and near the voltage difference between the point of described load petiolarea (2) and the earth terminal (7) that is connected with outside ground wire, when the voltage difference of described detection becomes greater than predetermined value, described device provides pseudo-leakage current, encourages described driving mechanism (4);
With switch element (SCR2 ', LED) excitation coil (12) that is connected in series and encourages described driving mechanism, described switch element is in the departing from described contact (3) of described pressure-wire main current path (L) and between the point and described earth terminal (7) of described load end (2), when the departing from described contact of described neutral main current path (N) and when the point of described load petiolarea (2) and the voltage difference between the described earth terminal (7) become greater than predetermined value, described switch element conducting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6281026A JP2992449B2 (en) | 1994-11-15 | 1994-11-15 | Circuit breaker |
| JP281026/94 | 1994-11-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1118108A CN1118108A (en) | 1996-03-06 |
| CN1046055C true CN1046055C (en) | 1999-10-27 |
Family
ID=17633259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95105294A Expired - Fee Related CN1046055C (en) | 1994-11-15 | 1995-05-24 | Circuit breaker |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2992449B2 (en) |
| CN (1) | CN1046055C (en) |
| GB (1) | GB2295284B (en) |
| HK (1) | HK1012129A1 (en) |
| MY (1) | MY115956A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2311177B (en) * | 1996-03-13 | 2000-08-02 | Crabtree Electrical Ind Ltd | Residual current devices |
| GB2412511B (en) * | 2001-06-08 | 2005-11-30 | Eaton Electric Ltd | Measuring devices |
| JP4931754B2 (en) * | 2007-10-03 | 2012-05-16 | 三菱電機株式会社 | Earth leakage breaker |
| JP5231061B2 (en) * | 2008-03-27 | 2013-07-10 | テンパール工業株式会社 | Circuit breaker |
| JP2009245791A (en) * | 2008-03-31 | 2009-10-22 | Panasonic Electric Works Co Ltd | Wiring instrument |
| JP5319949B2 (en) * | 2008-03-31 | 2013-10-16 | パナソニック株式会社 | Wiring equipment |
| JP5166174B2 (en) * | 2008-09-03 | 2013-03-21 | テンパール工業株式会社 | Circuit breaker |
| US8847475B2 (en) * | 2010-05-07 | 2014-09-30 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Lamp for replacing a fluorescent tube |
| CN102882227B (en) * | 2012-09-14 | 2015-03-18 | 江苏兆伏新能源有限公司 | High-power photovoltaic grid-connected inverter |
| EP3832684B1 (en) * | 2018-07-31 | 2024-02-14 | Panasonic Intellectual Property Management Co., Ltd. | Interrupter system |
| CN111509710B (en) * | 2020-04-29 | 2022-01-18 | 广东电网有限责任公司韶关供电局 | TN-C platform area electric leakage identification method, system, equipment and storage medium |
| CN114450865A (en) | 2020-11-13 | 2022-05-06 | 华为数字能源技术有限公司 | Power reverse connection preventing circuit, power distribution device and power supply and distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4068276A (en) * | 1976-07-14 | 1978-01-10 | Interelectronics Corporation | Protective system for electrical appliances |
| GB2152775A (en) * | 1983-11-28 | 1985-08-07 | B & R Electrical Prod Ltd | Reversed conductors auto-tripping system |
| GB2201055A (en) * | 1984-07-30 | 1988-08-17 | Technology Res Corp | Ground fault current interrupter circuit with additional protection |
| GB2204199A (en) * | 1987-05-02 | 1988-11-02 | Ashley Accessories Ltd | Residual current circuit breaker |
| GB2215149A (en) * | 1988-02-08 | 1989-09-13 | Shakira Ltd | Ground fault current interrupter with open neutral/ground lead operation |
| GB2244398A (en) * | 1990-05-25 | 1991-11-27 | Mk Electric Ltd | Test circuit for residual current device |
| GB2277646A (en) * | 1993-04-27 | 1994-11-02 | Shakira Ltd | Mains neutral fault detector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135542B (en) * | 1983-02-19 | 1986-11-05 | Ashley Accessories Ltd | Earth leakage circuit breaker |
| GB8332815D0 (en) * | 1983-12-08 | 1984-01-18 | Ashley Accessories Ltd | Electrical accessories |
-
1994
- 1994-11-15 JP JP6281026A patent/JP2992449B2/en not_active Expired - Lifetime
-
1995
- 1995-05-09 GB GB9509342A patent/GB2295284B/en not_active Expired - Fee Related
- 1995-05-16 MY MYPI95001286A patent/MY115956A/en unknown
- 1995-05-24 CN CN95105294A patent/CN1046055C/en not_active Expired - Fee Related
-
1998
- 1998-12-09 HK HK98112991A patent/HK1012129A1/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4068276A (en) * | 1976-07-14 | 1978-01-10 | Interelectronics Corporation | Protective system for electrical appliances |
| GB2152775A (en) * | 1983-11-28 | 1985-08-07 | B & R Electrical Prod Ltd | Reversed conductors auto-tripping system |
| GB2201055A (en) * | 1984-07-30 | 1988-08-17 | Technology Res Corp | Ground fault current interrupter circuit with additional protection |
| GB2204199A (en) * | 1987-05-02 | 1988-11-02 | Ashley Accessories Ltd | Residual current circuit breaker |
| GB2215149A (en) * | 1988-02-08 | 1989-09-13 | Shakira Ltd | Ground fault current interrupter with open neutral/ground lead operation |
| GB2244398A (en) * | 1990-05-25 | 1991-11-27 | Mk Electric Ltd | Test circuit for residual current device |
| GB2277646A (en) * | 1993-04-27 | 1994-11-02 | Shakira Ltd | Mains neutral fault detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1118108A (en) | 1996-03-06 |
| GB2295284B (en) | 1999-02-03 |
| GB2295284A (en) | 1996-05-22 |
| JP2992449B2 (en) | 1999-12-20 |
| GB9509342D0 (en) | 1995-06-28 |
| JPH08138523A (en) | 1996-05-31 |
| MY115956A (en) | 2003-10-31 |
| HK1012129A1 (en) | 1999-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 19991027 Termination date: 20140524 |