CN110854822A - Intelligent low-voltage molded case circuit breaker - Google Patents
Intelligent low-voltage molded case circuit breaker Download PDFInfo
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- CN110854822A CN110854822A CN201911200073.4A CN201911200073A CN110854822A CN 110854822 A CN110854822 A CN 110854822A CN 201911200073 A CN201911200073 A CN 201911200073A CN 110854822 A CN110854822 A CN 110854822A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H3/08—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 excess current
- H02H3/087—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 excess current for dc applications
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Abstract
The invention provides an intelligent low-voltage molded case circuit breaker, which comprises a first relay, a second relay, a main contact, a tripping tripper and an overheating tripper, wherein the main contact, the tripping tripper and the overheating tripper are sequentially connected, the first relay is used for receiving direct current of a direct current system at a section I, the second relay is used for receiving direct current of a direct current system at a section II, the tripping tripper and the overheating tripper are used for executing tripping operation when overcurrent occurs, the overheating tripper comprises a heating element, an expansion body and a transmission rod, and when the direct current of the direct current system at the section I and/or the direct current of the direct current system at the section II overcurrent occurs, the heating element generates heat to enable the expansion body to generate volume-displacement change to push the transmission. The invention can conveniently search the ground fault, improve the safety and stability of the operation of the power system, and utilize the change of the heated volume of the expansion body to execute the tripping operation, thereby overcoming the defects of larger error and nonadjustable action value of the traditional thermomagnetic tripping.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to an intelligent low-voltage molded case circuit breaker.
Background
A low-voltage circuit breaker (air switch) is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and closing, carrying, and opening/closing a current under an abnormal circuit condition for a predetermined time. The existing low-voltage circuit breaker is generally connected with one direct-current bus only, and when a direct-current system where the low-voltage circuit breaker is located has a ground fault, the low-voltage circuit breaker cannot be disconnected due to the fact that a large number of devices are arranged in the direct-current system on a loop where the low-voltage circuit breaker is located, namely, the position of the fault cannot be judged by disconnecting the low-voltage circuit breaker.
After a lot of searches, some typical prior arts are found, for example, a patent with application number 201610785677.X discloses an intelligent low-voltage circuit breaker and an arc extinguishing chamber thereof, the patent realizes the functions of remote inquiry and intelligent monitoring, and the arc extinguishing speed is greatly improved. Also, for example, the patent with application number 201811188208.5 discloses an intelligent low-voltage molded case circuit breaker, which automatically identifies fault information in a target circuit in real time and realizes intelligent circuit breaking. Still like the patent of application number 201110147877.X discloses a low pressure intelligent circuit breaker, this patent is small, compact structure, and is fixed reliable, adopts the standardization, and modular design facilitates the use and installs, has really realized the full intellectuality of digital protection, automatic control and communication function.
As can be seen, for the intelligent low-voltage circuit breaker, there are many practical problems to be dealt with urgently (determining the fault location by disconnecting the low-voltage circuit breaker, etc.) in practical application thereof, and no specific solutions have been proposed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an intelligent low-voltage molded case circuit breaker, which has the following specific technical scheme:
an intelligent low-voltage molded case circuit breaker comprises a first relay, a second relay, a main contact, a tripping tripper and an overheating tripper, wherein the main contact, the tripping tripper and the overheating tripper are sequentially connected;
the first relay is used for receiving direct current from an external I-section direct current system, and when the first relay is closed, the direct current of the I-section direct current system is transmitted to the main contact, and the direct current of the I-section direct current system is transmitted through a direct current bus of the I-section direct current system;
the second relay is used for receiving direct current from an external II-section direct current system, and when the second relay is closed, the direct current of the II-section direct current system is transmitted to the main contact, the direct current of the II-section direct current system is transmitted through a direct current bus of the II-section direct current system, and the direct current bus of the I-section direct current system and the direct current bus of the II-section direct current system are respectively used as a main bus and a standby bus;
the main contact is used for transmitting the direct current of the I-section direct current system and the direct current of the II-section direct current system to the tripping tripper and the overheating tripper, and the tripping tripper and the overheating tripper are used for executing tripping operation when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system is over-current;
the overheating release comprises a heating element, an expansion body and a transmission rod, and when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system flows over, the heating element heats the expansion body to expand to generate volume-displacement change to push the transmission rod to move so as to execute tripping operation.
Optionally, the expansion body is a casing including a sealed cavity, the transfer rod is a push rod piston, a push rod through hole is formed in the top end face of the casing, the push rod piston is movably arranged in the push rod through hole, the push rod piston is connected with the casing in a sealing mode, a fluid medium, a phase change expansion substance and an isolation diaphragm are installed in the sealed cavity, the isolation diaphragm is arranged between the fluid substance and the phase change expansion substance, one end of the push rod piston penetrates through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium.
Optionally, a sealing element is arranged between the ejector rod piston and the shell, and the sealing element is an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve.
Optionally, the phase change expanding substance is paraffin, and the fluid medium is liquid lubricating oil, lubricating grease or sealing grease.
Optionally, the heating element is disposed in the phase change expansion substance in the sealed cavity or on an outer side surface of the housing contacting the phase change expansion substance.
Optionally, an intelligence low pressure moulded case circuit breaker, still include respectively with spring and hasp that main contact is connected, and with the lever that the hasp is connected, the lever still with trip release connects, the spring is used for when the hasp separates, the pulling main contact makes two joint separation of main contact, in order to break off the circular telegram return circuit at main contact place, the hasp is used for when circuit breaker switch draws to close the handle and is triggered, maintains two joint contact of main contact, so that the return circuit at main contact place is opened, the lever is used for connecting the hasp with trip release also has the ejector pin piston.
Optionally, the trip release includes an electromagnetic release, the electromagnetic release is provided with an armature, and the armature is used for attracting when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system is overcurrent, so that the hook is separated through the lever, and the two joints of the main contact are separated.
The beneficial effects obtained by the invention comprise:
1. the intelligent low-voltage molded case circuit breaker comprises a first relay, a second relay, a main contact, a tripping tripper and an overheating tripper, wherein the main contact, the tripping tripper and the overheating tripper are sequentially connected, the first relay receives direct current from an external I-section direct current system, when the first relay is closed, the direct current of the I-section direct current system is transmitted to the main contact, the second relay receives direct current from an external II-section direct current system, when the second relay is closed, the direct current of the II-section direct current system is transmitted to the main contact, the main contact transmits the direct current of the I-section direct current system and the direct current of the II-section direct current system to the tripping tripper and the overheating tripper, and the tripping tripper and the overheating tripper execute tripping operation when the direct current of the I-section direct current system and/or the direct current of the II-section direct current. According to the intelligent low-voltage air molded case circuit breaker, the main and standby direct current buses are switched for the carried direct current load branch circuit through the two relays, namely the direct current bus of the direct current system at the section I and the direct current bus of the direct current system at the section II are switched, so that normal power supply is kept without disconnecting a circuit, a ground fault can be conveniently searched, and the safety and the stability of the operation of a power system are improved;
2. the overheating release comprises a heating element, an expansion body and a transmission rod, wherein when direct current of the I-section direct current system and/or direct current of the II-section direct current system are/is subjected to overcurrent, the heating element generates heat to enable expansion substances in the expansion body to be heated and expanded to generate volume-displacement change to push the transmission rod to move so as to execute tripping operation. The tripping operation is executed by utilizing the heated volume change of the phase change expansion substance, the defects that the traditional thermo-magnetic tripping action value has larger error and is not adjustable are overcome, and the thermo-magnetic tripping device has lower cost, small volume and simple structure.
Drawings
The present invention will be further understood from the following description taken in conjunction with the accompanying drawings, the emphasis instead being placed upon illustrating the principles of the embodiments.
Fig. 1 is a schematic diagram of an overall structure of an intelligent low-voltage molded case circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an overall structure of an intelligent low-voltage molded case circuit breaker according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal structure of an intelligent low-voltage molded case circuit breaker according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an appearance of an intelligent low-voltage molded case circuit breaker according to an embodiment of the invention;
fig. 5 is a schematic diagram of an overall structure of an intelligent low-voltage molded case circuit breaker system according to one embodiment of the present invention;
fig. 6 is a first schematic structural diagram of an overheat release according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an overheating trip according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.
The invention relates to an intelligent low-voltage molded case circuit breaker, which explains the following embodiments according to the attached drawings:
the first embodiment is as follows:
a low-voltage circuit breaker (air switch) is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and closing, carrying, and opening/closing a current under an abnormal circuit condition for a predetermined time. The existing low-voltage circuit breaker is generally connected with one direct-current bus only, and when a direct-current system where the low-voltage circuit breaker is located has a ground fault, the low-voltage circuit breaker cannot be disconnected due to the fact that a large number of devices are arranged in the direct-current system on a loop where the low-voltage circuit breaker is located, namely, the position of the fault cannot be judged by disconnecting the low-voltage circuit breaker. Based on the above, the intelligent low-voltage molded case circuit breaker and the system provided by the embodiment of the invention can conveniently search the ground fault and improve the safety and stability of the operation of the power system.
As shown in fig. 1, an intelligent low-voltage molded case circuit breaker includes a first relay 10 and a second relay 20, and further includes a main contact 30, a trip release 40, and an overheat release 90, which are connected in sequence, wherein the first relay 10 and the second relay 20 are respectively connected with the main contact 30 through a line;
the first relay 10 is configured to receive direct current from an external I-stage direct current system 1, and when the first relay 10 is closed, the direct current of the I-stage direct current system 1 is transmitted to the main contact 30, and the direct current of the I-stage direct current system 1 is transmitted through a direct current bus of the I-stage direct current system 1;
the second relay 20 is configured to receive a direct current from an external section II direct current system 2, and when the second relay 20 is closed, transmit the direct current of the section II direct current system 2 to the main contact 30, where the direct current of the section II direct current system 2 is transmitted through a direct current bus of the section II direct current system 2, and the direct current bus of the section I direct current system 1 and the direct current bus of the section II direct current system 2 are respectively used as a main bus and a standby bus;
the main contacts 30 are used for transmitting the direct current of the I-stage direct current system 1 and the direct current of the II-stage direct current system 2 to the trip release 40 and the overheat release 90, and the trip release 40 and the overheat release 90 are used for performing a trip operation when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent.
The overheating release 90 includes a heating element, an expansion body and a transmission rod, when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, the heating element generates heat to make the expansion material in the expansion body expand by heating to generate volume-displacement change to push the transmission rod to move so as to execute a trip operation. Wherein the volume-displacement change generated by the thermal expansion of the expanding material in the expanding body is generated by the solid-liquid phase or liquid-gas phase change of the expanding material.
The intelligent low-voltage molded case circuit breaker includes a first relay 10 and a second relay 20, and further includes a main contact 30, a trip release 40, and an overheating release 90, which are connected in sequence, the first relay 10 receives a direct current from an external I-stage direct current system 1, when the first relay 10 is closed, the direct current of the I-stage direct current system 1 is transmitted to the main contact 30, the second relay 20 receives the direct current from the external II-stage direct current system 2, when the second relay 20 is closed, the direct current of the II-stage dc system 2 is supplied to the main contact 30, the main contact 30 supplies the direct current of the I-stage dc system 1 and the direct current of the II-stage dc system 2 to the trip release 40 and the overheat release 90, and the trip release 40 and the overheat release 90 perform a trip operation when the direct current of the I-stage dc system 1 and/or the direct current of the II-stage dc system 2 overcurrent. The intelligent low-voltage air molded case circuit breaker switches the main direct current bus and the standby direct current bus of the carried direct current load branch circuit through the two relays, namely switches the direct current bus of the direct current system 1 at the section I and the direct current bus of the direct current system 2 at the section II, so that normal power supply is kept without disconnecting the circuit, the ground fault can be conveniently searched, and the safety and the stability of the operation of the power system are improved.
The intelligent low-voltage molded case circuit breaker is connected with a main bus, namely, is connected with a direct current bus of the I-section direct current system 1 through a first relay 10, when an earth fault occurs in an external device connected to the intelligent low-voltage molded case circuit breaker through the dc bus of the I-section dc system 1, the direct current bus of the I section direct current system 1 connected with the intelligent low-voltage molded case circuit breaker is switched to the direct current bus of the II section direct current system 2, that is, the second relay 20 is charged according to a preset program, the dc bus of the section II dc system 2 connected to the second relay 20 is put into operation, namely, the connection loop of the intelligent low-voltage molded case circuit breaker and the standby bus is switched on, the second relay 20 is powered off after the preset time is delayed, namely, the connection loop of the intelligent low-voltage molded case circuit breaker and the main bus is disconnected, so that whether the ground fault occurs in the working loop of the intelligent low-voltage molded case circuit breaker is judged. Because an equipment is connected with a plurality of intelligent low-voltage molded case circuit breakers, when the equipment has ground fault, the intelligent low-voltage molded case circuit breakers connected with the equipment are switched between the main bus and the standby bus one by one according to the mode, so that the position of the equipment where the ground fault occurs can be determined, the ground fault can be conveniently found, and the safety and the stability of the operation of the power system are improved.
As shown in fig. 3, the overheating release 90 includes a heating element 900, an expansion body 901 and a transmission rod 902, when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, the heating element 900 generates heat to cause the expansion substance in the expansion body 901 to expand by heating and generate a volume-displacement change to push the transmission rod 902 to move so as to perform a trip operation. The tripping operation is executed by utilizing the heated volume change of the phase change expansion substance, the defects that the traditional thermo-magnetic tripping action value has larger error and is not adjustable are overcome, and the thermo-magnetic tripping device has lower cost, small volume and simple structure.
Referring to fig. 2, another structural schematic diagram of an intelligent low-voltage molded case circuit breaker is shown, which further illustrates, on the basis of fig. 1, a first normally open contact 101, a second normally open contact 102, a third normally open contact 201, a fourth normally open contact 202, a first indicator light 103, a second indicator light 203, a switch pull-close handle 50, a switch housing 60, a spring 70, a hook 80, an armature 401, and a fixing member. The first relay 10 is provided with a first normally open contact and a second normally open contact, the first normally open contact is used for receiving direct current positive electricity in direct current of the I-section direct current system 1, and the second normally open contact is used for receiving direct current negative electricity in direct current of the I-section direct current system 1. The second relay 20 includes a third normally open contact and a fourth normally open contact, the third normally open contact is used for receiving the direct current positive electricity in the direct current of the II-stage direct current system 2, and the fourth normally open contact is used for receiving the direct current negative electricity in the direct current of the II-stage direct current system 2.
The first relay 10 includes a first indicator light 103, wherein the first indicator light 103 is configured to illuminate when the first relay 10 is closed. The second relay 20 includes a second indicator light 203, wherein the second indicator light 203 is configured to illuminate when the second relay 20 is closed. The first relay 10 and the second relay 20 are both 8-pin relays.
The intelligent low voltage molded case circuit breaker further includes a switch pull-in handle 50 and a switch case 60, wherein the switch pull-in handle 50 is disposed on an outer wall of the switch case 60, and the first relay 10, the second relay 20, the main contact 30 and the trip release 40 are all disposed inside the switch case 60.
Optionally, the intelligent low-voltage molded case circuit breaker further includes a spring 70 and a hook 80 respectively connected to the main contact 30, and a lever 801 connected to the hook 80, the lever 801 is further connected to the trip release 40, the spring 70 is configured to pull the main contact 30 to separate two joints of the main contact 30 when the hook 80 is separated, so as to disconnect the power-on loop where the main contact 30 is located, the hook 80 is configured to maintain two joint contacts of the main contact 30 when the breaker switch pull-on handle 50 is triggered, so as to open the loop where the main contact 30 is located, and the lever 801 is configured to connect the hook 80 and the trip release 40 and further includes a plunger.
Optionally, the trip release 40 includes an electromagnetic release, the electromagnetic release is provided with an armature 401, and the armature 401 is used for attracting when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, so as to separate the hook 80 through the lever 801, and separate the two joints of the main contact 30.
In an embodiment, as shown in fig. 3, a schematic structural diagram of the inside of an intelligent low-voltage molded case circuit breaker is shown, in a normal operation condition, a direct current bus of a direct current system 1 at a section I and a direct current bus of a direct current system 2 at a section II are both electrified and are respectively connected to a relay I10 '(i.e., the first relay 10) and a relay II20' (i.e., the second relay 20), at this time, a controller connected to the intelligent low-voltage molded case circuit breaker controls the relay I10 'to be electrified, a normally open contact of the relay 1 is closed, a line is conducted, and a green indicator light on the relay I10' is turned on, i.e., the first indicator light 103 is turned on. Relay 2 is not electrified, and normally open contact disconnection, the circuit is not expert, and green pilot lamp on relay 2 does not light promptly above-mentioned second pilot lamp 203 does not light. When the switch is closed and the handle 50 is closed, the equipment connected with the intelligent low-voltage molded case circuit breaker can operate in a live-line mode. When a certain branch of the I-section direct current system 1 is in positive grounding or negative grounding, the controller enables the relay 2 to be electrified according to a preset program, the circuit of the relay 2 is conducted, the I-section direct current and the II-section direct current run in parallel at the moment, and the green indicator lamps of the two relays are all turned on. After short time delay, the relay I10' is controlled to lose power and is loaded by the section II, at the moment, the green light of the relay I10' is turned off, and the green light of the relay II20' is turned on. If the branch circuit is a grounding branch circuit, the isolation of the grounding branch circuit is realized, and if the branch circuit is not grounded, the protection of the branch circuit is realized, so that incorrect actions of a protection device caused by direct current grounding and even possible switch misoperation are prevented.
The intelligent low-voltage molded case circuit breaker is judged to be powered by a direct current bus of an I section or a direct current bus of a II section through an external controller connected with the intelligent low-voltage molded case circuit breaker, so that a corresponding relay is electrified, a normally open contact of the electrified relay is closed, current enters a main contact 30 through an incoming line, and a direct current outgoing line is electrified after the main contact 30 is closed. In the process of switching the power supply, the two sections of direct currents are operated in parallel, and the power supply to be disconnected is disconnected, so that the risk of power failure of the live equipment is avoided. The intelligent low-voltage molded case circuit breaker utilizes an electromagnetic tripping principle, when an overcurrent condition occurs, the armature is attracted, and the main contact 30 is separated by the liftout hook 80, so that a tripping function is realized.
As shown in fig. 4, an appearance structure diagram of an intelligent low-voltage molded case circuit breaker is provided, the intelligent low-voltage molded case circuit breaker is provided with a switch casing 60, a switch pull-close handle 50 is arranged on the switch casing 60, and the on-off indicator lamp shown in fig. 4 is an indicator lamp on the relay.
In summary, in the intelligent low-voltage molded case circuit breaker provided by the embodiment of the present invention, because the intelligent low-voltage molded case circuit breaker of the embodiment of the present invention switches the main and standby dc buses of the dc load branch, that is, switches the dc bus of the I-section dc system 1 and the dc bus of the II-section dc system 2, the normal power supply is maintained without disconnecting the lines, the ground fault can be conveniently found, and the safety and stability of the operation of the power system are improved
Based on the intelligent low-voltage molded case circuit breaker described in the above embodiment, an embodiment of the present invention further provides an intelligent low-voltage molded case circuit breaker system, including the above-described intelligent low-voltage molded case circuit breaker, and further including an external device connected to the intelligent low-voltage molded case circuit breaker, and fig. 5 shows a schematic structural diagram of the intelligent low-voltage molded case circuit breaker system provided in the embodiment of the present invention, including an intelligent low-voltage molded case circuit breaker 100, and further including an external device 200 connected to the intelligent low-voltage molded case circuit breaker.
It should be understood that fig. 5 is only a schematic structural diagram of the intelligent low-voltage molded case circuit breaker system, and is not a unique structure of the intelligent low-voltage molded case circuit breaker system, and in actual use, besides the structure shown in fig. 5, other functional structures may be included, specifically taking actual use conditions as a standard, which is not limited in this embodiment of the present invention.
Example two:
as shown in fig. 1, an intelligent low-voltage molded case circuit breaker includes a first relay 10 and a second relay 20, and further includes a main contact 30, a trip release 40, and an overheat release 90, which are connected in sequence, wherein the first relay 10 and the second relay 20 are respectively connected with the main contact 30 through a line;
the first relay 10 is configured to receive direct current from an external I-stage direct current system 1, and when the first relay 10 is closed, the direct current of the I-stage direct current system 1 is transmitted to the main contact 30, and the direct current of the I-stage direct current system 1 is transmitted through a direct current bus of the I-stage direct current system 1;
the second relay 20 is configured to receive a direct current from an external section II direct current system 2, and when the second relay 20 is closed, transmit the direct current of the section II direct current system 2 to the main contact 30, where the direct current of the section II direct current system 2 is transmitted through a direct current bus of the section II direct current system 2, and the direct current bus of the section I direct current system 1 and the direct current bus of the section II direct current system 2 are respectively used as a main bus and a standby bus;
the main contacts 30 are used for transmitting the direct current of the I-stage direct current system 1 and the direct current of the II-stage direct current system 2 to the trip release 40 and the overheat release 90, and the trip release 40 and the overheat release 90 are used for performing a trip operation when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent.
The overheating release 90 includes a heating element, an expansion body and a transmission rod, when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, the heating element generates heat to make the expansion material in the expansion body expand by heating to generate volume-displacement change to push the transmission rod to move so as to execute a trip operation. Wherein the volume-displacement change generated by the thermal expansion of the expanding material in the expanding body is generated by the solid-liquid phase or liquid-gas phase change of the expanding material.
The intelligent low-voltage molded case circuit breaker includes a first relay 10 and a second relay 20, and further includes a main contact 30, a trip release 40, and an overheating release 90, which are connected in sequence, the first relay 10 receives a direct current from an external I-stage direct current system 1, when the first relay 10 is closed, the direct current of the I-stage direct current system 1 is transmitted to the main contact 30, the second relay 20 receives the direct current from the external II-stage direct current system 2, when the second relay 20 is closed, the direct current of the II-stage dc system 2 is supplied to the main contact 30, the main contact 30 supplies the direct current of the I-stage dc system 1 and the direct current of the II-stage dc system 2 to the trip release 40 and the overheat release 90, and the trip release 40 and the overheat release 90 perform a trip operation when the direct current of the I-stage dc system 1 and/or the direct current of the II-stage dc system 2 overcurrent. The intelligent low-voltage air molded case circuit breaker switches the main direct current bus and the standby direct current bus of the carried direct current load branch circuit through the two relays, namely switches the direct current bus of the direct current system 1 at the section I and the direct current bus of the direct current system 2 at the section II, so that normal power supply is kept without disconnecting the circuit, the ground fault can be conveniently searched, and the safety and the stability of the operation of the power system are improved.
The intelligent low-voltage molded case circuit breaker is connected with a main bus, namely, is connected with a direct current bus of the I-section direct current system 1 through a first relay 10, when an earth fault occurs in an external device connected to the intelligent low-voltage molded case circuit breaker through the dc bus of the I-section dc system 1, the direct current bus of the I section direct current system 1 connected with the intelligent low-voltage molded case circuit breaker is switched to the direct current bus of the II section direct current system 2, that is, the second relay 20 is charged according to a preset program, the dc bus of the section II dc system 2 connected to the second relay 20 is put into operation, namely, the connection loop of the intelligent low-voltage molded case circuit breaker and the standby bus is switched on, the second relay 20 is powered off after the preset time is delayed, namely, the connection loop of the intelligent low-voltage molded case circuit breaker and the main bus is disconnected, so that whether the ground fault occurs in the working loop of the intelligent low-voltage molded case circuit breaker is judged. Because an equipment is connected with a plurality of intelligent low-voltage molded case circuit breakers, when the equipment has ground fault, the intelligent low-voltage molded case circuit breakers connected with the equipment are switched between the main bus and the standby bus one by one according to the mode, so that the position of the equipment where the ground fault occurs can be determined, the ground fault can be conveniently found, and the safety and the stability of the operation of the power system are improved.
The overheating release 90 comprises a heating element 900, an expansion body 901 and a transmission rod 902, when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, the heating element 900 generates heat to make the expansion substance in the expansion body 901 expand by heat to generate volume-displacement change to push the transmission rod 902 to move so as to execute the tripping operation. The tripping operation is executed by utilizing the heated volume change of the phase change expansion substance, the defects that the traditional thermo-magnetic tripping action value has larger error and is not adjustable are overcome, and the thermo-magnetic tripping device has lower cost, small volume and simple structure.
Referring to fig. 2, another structural schematic diagram of an intelligent low-voltage molded case circuit breaker is shown, which further illustrates, on the basis of fig. 1, a first normally open contact 101, a second normally open contact 102, a third normally open contact 201, a fourth normally open contact 202, a first indicator light 103, a second indicator light 203, a switch pull-close handle 50, a switch housing 60, a spring 70, a hook 80, an armature 401, and a fixing member. The first relay 10 is provided with a first normally open contact and a second normally open contact, the first normally open contact is used for receiving direct current positive electricity in direct current of the I-section direct current system 1, and the second normally open contact is used for receiving direct current negative electricity in direct current of the I-section direct current system 1. The second relay 20 includes a third normally open contact and a fourth normally open contact, the third normally open contact is used for receiving the direct current positive electricity in the direct current of the II-stage direct current system 2, and the fourth normally open contact is used for receiving the direct current negative electricity in the direct current of the II-stage direct current system 2.
The first relay 10 includes a first indicator light 103, wherein the first indicator light 103 is configured to illuminate when the first relay 10 is closed. The second relay 20 includes a second indicator light 203, wherein the second indicator light 203 is configured to illuminate when the second relay 20 is closed. The first relay 10 and the second relay 20 are both 8-pin relays.
The intelligent low voltage molded case circuit breaker further includes a switch pull-in handle 50 and a switch case 60, wherein the switch pull-in handle 50 is disposed on an outer wall of the switch case 60, and the first relay 10, the second relay 20, the main contact 30 and the trip release 40 are all disposed inside the switch case 60.
Optionally, the intelligent low-voltage molded case circuit breaker further includes a spring 70 and a hook 80 respectively connected to the main contact 30, and a lever 801 connected to the hook 80, the lever 801 is further connected to the trip release 40, the spring 70 is configured to pull the main contact 30 to separate two joints of the main contact 30 when the hook 80 is separated, so as to disconnect the power-on loop where the main contact 30 is located, the hook 80 is configured to maintain two joint contacts of the main contact 30 when the breaker switch pull-on handle 50 is triggered, so as to open the loop where the main contact 30 is located, and the lever 801 is configured to connect the hook 80 and the trip release 40 and further includes a plunger.
Optionally, the trip release 40 includes an electromagnetic release, the electromagnetic release is provided with an armature 401, and the armature 401 is used for attracting when the direct current of the I-stage direct current system 1 and/or the direct current of the II-stage direct current system 2 is overcurrent, so as to separate the hook 80 through the lever 801, and separate the two joints of the main contact 30.
In an embodiment, as shown in fig. 3, a schematic structural diagram of the inside of an intelligent low-voltage molded case circuit breaker is shown, in a normal operation condition, a direct current bus of a direct current system 1 at a section I and a direct current bus of a direct current system 2 at a section II are both electrified and are respectively connected to a relay I10' (i.e., the first relay 10) and a relay II20' (i.e., the second relay 20), at this time, a controller connected with the intelligent low-voltage molded case circuit breaker controls the relay I10' to be electrified, a normally open contact of the relay I10' is closed, a line is conducted, and a green indicator light on the relay I10' is turned on, i.e., the first indicator light 103 is turned on. Relay II20' is not electrified, and normally open contact opens, and the circuit is not expert, and the green pilot lamp on relay 2 does not light promptly above-mentioned second pilot lamp 203 does not light. When the switch is closed and the handle 50 is closed, the equipment connected with the intelligent low-voltage molded case circuit breaker can operate in a live-line mode. When a certain branch of the I-section direct current system 1 is in positive grounding or negative grounding, the controller enables the relay 2 to be electrified according to a preset program, the circuit of the relay 2 is conducted, the I-section direct current and the II-section direct current run in parallel at the moment, and the green indicator lamps of the two relays are all turned on. After short time delay, the relay I10' is controlled to lose power and is loaded by the section II, at the moment, the green light of the relay I10' is turned off, and the green light of the relay II20' is turned on. If the branch circuit is a grounding branch circuit, the isolation of the grounding branch circuit is realized, and if the branch circuit is not grounded, the protection of the branch circuit is realized, so that incorrect actions of a protection device caused by direct current grounding and even possible switch misoperation are prevented.
The intelligent low-voltage molded case circuit breaker is judged to be powered by a direct current bus of an I section or a direct current bus of a II section through an external controller connected with the intelligent low-voltage molded case circuit breaker, so that a corresponding relay is electrified, a normally open contact of the electrified relay is closed, current enters a main contact 30 through an incoming line, and a direct current outgoing line is electrified after the main contact 30 is closed. In the process of switching the power supply, the two sections of direct currents are operated in parallel, and the power supply to be disconnected is disconnected, so that the risk of power failure of the live equipment is avoided. The intelligent low-voltage molded case circuit breaker utilizes an electromagnetic tripping principle, when an overcurrent condition occurs, the armature is attracted, and the main contact 30 is separated by the liftout hook 80, so that a tripping function is realized.
As shown in fig. 4, an appearance structure diagram of an intelligent low-voltage molded case circuit breaker is provided, the intelligent low-voltage molded case circuit breaker is provided with a switch casing 60, a switch pull-close handle 50 is arranged on the switch casing 60, and the on-off indicator lamp shown in fig. 4 is an indicator lamp on the relay.
In summary, in the intelligent low-voltage molded case circuit breaker provided by the embodiment of the present invention, because the intelligent low-voltage molded case circuit breaker of the embodiment of the present invention switches the main and standby dc buses of the dc load branch, that is, switches the dc bus of the I-section dc system 1 and the dc bus of the II-section dc system 2, the normal power supply is maintained without disconnecting the lines, the ground fault can be conveniently found, and the safety and stability of the operation of the power system are improved
As shown in fig. 6, the expansion body is a casing 9010 including a sealed cavity, the transfer rod 902 is a push rod piston, a push rod through hole is formed in the top end face of the casing 9010, the push rod piston is movably arranged in the push rod through hole, the push rod piston is connected with the casing 9010 in a sealed manner, a fluid medium 9011, a phase change expansion substance 9013 and an isolation diaphragm 9012 are installed in the sealed cavity, the isolation diaphragm 9012 is arranged between the fluid substance and the phase change expansion substance 9013, one end of the push rod piston penetrates through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium 9011.
A sealing element 9014 is arranged between the ejector rod piston and the shell 9010, and the sealing element 9014 is an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve. The phase change expansion substance 9013 is paraffin, and the fluid medium 9011 is liquid lubricating oil, lubricating grease or sealing grease. The heating element is arranged in the phase change expansion substance 9013 in the sealed cavity or on the outer side surface of the shell 9010 contacted with the phase change expansion substance 9013.
In the embodiment, other compounds can be used instead of paraffin, as long as the compound expands in volume after being heated and has obvious expansion and contraction effects. Specifically, paraffin wax has a large volume expansion coefficient in the vicinity of its melting point temperature, and its maximum expansion rate can reach 15% at a pressure of 200 MPa. The phase change expanding material 9013 includes, but is not limited to, paraffin.
As shown in fig. 6, a coil spring 9015 is disposed between the plunger piston and the housing 9010, so that the plunger piston is pushed back into the sealed cavity when the phase change expanding material 9013 is cooled, and the circuit breaker is ready to be reset for the next closing operation.
As shown in fig. 7, a fine adjustment mechanism is further provided at the bottom of the housing 9010. One end of the fine adjustment mechanism extends into a phase change expansion material 9013 in the sealed cavity and comprises an inner screw 9016, an outer screw 9016 and a bolt 9017. The inner and outer screws 9016 are provided with inner threads and outer threads, are in threaded connection with the bottom of the housing 9010, have one end extending into the phase change expansion material 9013 in the sealed cavity, and have the other end located outside the housing 9010. The bolt 9017 has an external thread, which passes through the inner and outer screws 9016 and is in threaded connection with the inner and outer screws 9016, one end of which extends into the phase change expansion material 9013 in the sealed cavity, and the other end of which is located outside the housing 9010.
Through the fine adjustment mechanism, the amount of the expansion substances, extending into the sealed cavity, of the inner screw 9016, the outer screw 9016 and the bolt 9017 is adjusted, a volume-displacement change curve generated by thermal expansion of the phase change expansion substance 9013 can be finely adjusted, and then the relation between the moving length and the temperature of the ejector rod piston during volume-displacement change generated by thermal expansion of the phase change expansion substance 9013 is adjusted, so that tripping operation can be performed by better utilizing the change of the heated volume of the phase change expansion substance 9013.
In this example, when the phase change expanding material 9013 (paraffin) is in a solid state, the fine adjustment mechanism (inner and outer screws 9016 and/or bolts 9017) extends at least partially into the phase change expanding material 9013.
Example three:
the present embodiment is substantially the same as the second embodiment, except that the expansion body is made of a memory alloy material, and an elastic member (such as a memory alloy coil spring) capable of expanding and contracting is used to replace the object including the sealed cavity and the phase change expansion substance, the fluid medium and the isolation diaphragm in the sealed cavity in the second embodiment.
Under the heating action of the heating element, the memory alloy elastic component gradually extends and pushes the transmission rod to move, and when the heating element reaches a certain temperature, the transmission rod pushes the lever 801 to execute the tripping operation. After the circuit breaker is powered off, the heating element stops working, the memory alloy elastic part is gradually cooled and shrunk to recover to the original length, and the circuit breaker can continue normal switching-on and switching-off operations.
In summary, the intelligent low-voltage molded case circuit breaker disclosed by the invention has the following beneficial technical effects: 1. the intelligent low-voltage molded case circuit breaker comprises a first relay, a second relay, a main contact, a tripping tripper and an overheating tripper, wherein the main contact, the tripping tripper and the overheating tripper are sequentially connected, the first relay receives direct current from an external I-section direct current system, when the first relay is closed, the direct current of the I-section direct current system is transmitted to the main contact, the second relay receives direct current from an external II-section direct current system, when the second relay is closed, the direct current of the II-section direct current system is transmitted to the main contact, the main contact transmits the direct current of the I-section direct current system and the direct current of the II-section direct current system to the tripping tripper and the overheating tripper, and the tripping tripper and the overheating tripper execute tripping operation when the direct current of the I-section direct current system and/or the direct current of the II-section direct current. According to the intelligent low-voltage air molded case circuit breaker, the main and standby direct current buses are switched for the carried direct current load branch circuit through the two relays, namely the direct current bus of the direct current system at the section I and the direct current bus of the direct current system at the section II are switched, so that normal power supply is kept without disconnecting a circuit, a ground fault can be conveniently searched, and the safety and the stability of the operation of a power system are improved;
2. the overheating release comprises a heating element, an expansion body and a transmission rod, wherein when direct current of the I-section direct current system and/or direct current of the II-section direct current system are/is subjected to overcurrent, the heating element generates heat to enable expansion substances in the expansion body to be heated and expanded to generate volume-displacement change to push the transmission rod to move so as to execute tripping operation. The tripping operation is executed by utilizing the heated volume change of the phase change expansion substance, the defects that the traditional thermo-magnetic tripping action value has larger error and is not adjustable are overcome, and the thermo-magnetic tripping device has lower cost, small volume and simple structure.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples, and various configurations may omit, replace, or add various processes or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many of the elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, such as well-known circuits, processes, algorithms, structures, and techniques, which have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (9)
1. An intelligent low-voltage molded case circuit breaker is characterized by comprising a first relay, a second relay, a main contact, a tripping tripper and an overheating tripper which are sequentially connected, wherein the first relay and the second relay are respectively connected with the main contact through a circuit;
the first relay is used for receiving direct current from an external I-section direct current system, and when the first relay is closed, the direct current of the I-section direct current system is transmitted to the main contact, and the direct current of the I-section direct current system is transmitted through a direct current bus of the I-section direct current system;
the second relay is used for receiving direct current from an external II-section direct current system, and when the second relay is closed, the direct current of the II-section direct current system is transmitted to the main contact, the direct current of the II-section direct current system is transmitted through a direct current bus of the II-section direct current system, and the direct current bus of the I-section direct current system and the direct current bus of the II-section direct current system are respectively used as a main bus and a standby bus;
the main contact is used for transmitting the direct current of the I-section direct current system and the direct current of the II-section direct current system to the tripping tripper and the overheating tripper, and the tripping tripper and the overheating tripper are used for executing tripping operation when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system is over-current;
the overheating release comprises a heating element, an expansion body and a transmission rod, and when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system flows over, the heating element heats the expansion body to expand to generate volume-displacement change to push the transmission rod to move so as to execute tripping operation.
2. The intelligent low-voltage molded case circuit breaker according to claim 1, wherein the expansion body is a housing including a sealed cavity, the transmission rod is a push rod piston, a push rod through hole is formed in a top end surface of the housing, the push rod piston is movably disposed in the push rod through hole, the push rod piston is hermetically connected with the housing, a fluid medium, a phase change expanding substance and an isolation diaphragm are mounted in the sealed cavity, the isolation diaphragm is disposed between the fluid substance and the phase change expanding substance, one end of the push rod piston passes through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium.
3. The intelligent low-voltage molded case circuit breaker according to claim 2, wherein a sealing member is provided between the plunger piston and the case, and the sealing member is an O-ring, a gasket or an annular gland.
4. The intelligent low-voltage molded case circuit breaker according to claim 3, wherein the phase-change expanding substance is paraffin, and the fluid medium is liquid lubricating oil, grease or sealing grease.
5. The intelligent low-voltage molded case circuit breaker as claimed in claim 4, wherein the heating element is disposed in the phase change expansive substance in the sealed cavity or on an outer side surface of the case contacting the phase change expansive substance.
6. The intelligent low-voltage molded case circuit breaker according to claim 5, further comprising a spring and a hook respectively connected to the main contact, and a lever connected to the hook, wherein the lever is further connected to the trip release, the spring is configured to pull the main contact to separate two contacts of the main contact when the hook is separated, so as to disconnect the power-on loop where the main contact is located, the hook is configured to maintain the two contacts of the main contact to be in contact when a breaker switch pull-on handle is triggered, so as to open the loop where the main contact is located, and the lever is configured to connect the hook and the trip release and further includes a plunger.
7. An intelligent low-voltage molded case circuit breaker according to claim 6, wherein the trip release comprises an electromagnetic release with an armature for attracting when the direct current of the I-section direct current system and/or the direct current of the II-section direct current system is overcurrent to separate the hooks by the lever to separate the two joints of the main contact.
8. The intelligent low-voltage molded case circuit breaker according to claim 7, wherein a fine adjustment mechanism is provided at the bottom of the case, one end of the fine adjustment mechanism extends into the phase change expanding material in the sealed cavity, and the fine adjustment mechanism comprises an inner screw, an outer screw and a bolt;
the inner screw and the outer screw are provided with inner threads and outer threads, the inner screws and the outer screws are in threaded connection with the bottom of the shell, one end of each inner screw extends into the phase change expansion material in the sealed cavity, and the other end of each inner screw is positioned on the outer side of the shell;
the bolt is provided with external threads, penetrates through the internal and external screws and is in threaded connection with the internal and external screws, one end of the bolt extends into the phase change expansion substance in the sealed cavity, and the other end of the bolt is positioned on the outer side of the shell.
9. The intelligent low-voltage molded case circuit breaker as claimed in claim 1, wherein the expansion body is a memory alloy elastic member that can be extended and contracted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911200073.4A CN110854822A (en) | 2019-11-29 | 2019-11-29 | Intelligent low-voltage molded case circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911200073.4A CN110854822A (en) | 2019-11-29 | 2019-11-29 | Intelligent low-voltage molded case circuit breaker |
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| CN101840796A (en) * | 2010-02-11 | 2010-09-22 | 冯运福 | Circuit breaker closing/opening actuating mechanism |
| CN102103947A (en) * | 2010-11-18 | 2011-06-22 | 冯硕 | Driving device for closing/opening execution mechanism of circuit breaker |
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Application publication date: 20200228 |