CN112133608B - A temperature-controlled molded case circuit breaker overload alarm non-tripping device - Google Patents
A temperature-controlled molded case circuit breaker overload alarm non-tripping device Download PDFInfo
- Publication number
- CN112133608B CN112133608B CN202011123734.0A CN202011123734A CN112133608B CN 112133608 B CN112133608 B CN 112133608B CN 202011123734 A CN202011123734 A CN 202011123734A CN 112133608 B CN112133608 B CN 112133608B
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- ceramic piece
- thermal element
- molded case
- tripping device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims description 39
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
本发明涉及一种温控型塑壳断路器过载报警不脱扣装置，包括电流输出端子，电流输出端子上安装静铁芯和热元件，热元件上安装导热绝缘件，导热绝缘件中安装热敏电阻，热敏电阻连接信号线，信号线连接控制器，热元件与软连接连接。本发明具有短路保护功能，结构紧凑，节省空间，采用温度监测的方式实时监测发热元件温度，反馈主回路电流是否过载，确保断路器不脱扣并精准输出报警信号。
The present invention relates to a temperature-controlled molded case circuit breaker overload alarm non-tripping device, comprising a current output terminal, a static iron core and a thermal element are installed on the current output terminal, a thermal conductive insulating member is installed on the thermal element, a thermistor is installed in the thermal conductive insulating member, the thermistor is connected to a signal line, the signal line is connected to a controller, and the thermal element is connected to a soft connection. The present invention has a short-circuit protection function, a compact structure, and space saving. The temperature of the heating element is monitored in real time by temperature monitoring, and feedback is given on whether the main circuit current is overloaded, so as to ensure that the circuit breaker does not trip and accurately output an alarm signal.
Description
Technical Field
The invention belongs to the technical field of thermomagnetic molded case circuit breakers, and relates to an overload alarm non-tripping device of a temperature control molded case circuit breaker.
Background
Generally, the overload non-tripping function of the thermo-magnetic molded case circuit breaker is realized by driving a signal change-over switch through a thermal bimetal element. The parts are more, the structure is relatively complex and the occupied space is large.
Disclosure of Invention
The invention aims to provide an overload alarm non-tripping device for a temperature control type molded case circuit breaker, which can solve the problems of more parts, relatively complex structure and large occupied space of an original device.
According to the technical scheme, the overload alarm non-tripping device of the temperature control type molded case circuit breaker comprises a current output terminal, wherein a static iron core and a thermal element are arranged on the current output terminal, a heat conducting insulating piece is arranged on the thermal element, a thermistor is arranged in the heat conducting insulating piece and is connected with a signal wire, the signal wire is connected with a controller, and the thermal element is connected with a flexible connection.
As a further improvement of the invention, the controller is mounted on the circuit breaker housing.
As a further improvement of the present invention, the current output terminal and the stationary core are fixed by riveting with a first rivet.
As a further development of the invention, the current output terminal and the thermal element are riveted by means of a second rivet.
As a further development of the invention, the thermal element is connected to the flexible connection by means of welding.
As a further development of the invention, the flexible connection is made of copper.
As a further improvement of the invention, the heat conducting and insulating member is a ceramic member.
As a further improvement of the invention, the heat conducting insulating member is a heat conducting silica gel member.
As a further improvement of the invention, the ceramic piece comprises a first ceramic piece and a second ceramic piece, wherein the first ceramic piece and the second ceramic piece are of a half-cavity structure, the thermal element is connected with the first ceramic piece and the second ceramic piece through screws, the thermistors are arranged in the cavities of the first ceramic piece and the second ceramic piece, the side surfaces of the first ceramic piece and the second ceramic piece are provided with outlets, one end of the signal wire is connected with the thermistors, and the other end of the signal wire penetrates through the outlets to be connected with the controller.
The application has the positive progress effects that:
1. the invention has the short-circuit protection function, compact structure and space saving.
2. The invention adopts a temperature monitoring mode to monitor the temperature of the heating element in real time, feeds back whether the current of the main loop is overloaded, ensures that the circuit breaker is not tripped and accurately outputs an alarm signal.
3. The invention has reliable functions.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural assembly view of the present invention.
Fig. 3 is a circuit diagram of a controller according to the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
In fig. 1 to 3, the electric current output terminal 1, the static iron core 2, the first rivet 3, the second rivet 4, the heat element 5, the screw 6, the first ceramic sheet 7, the second ceramic sheet 8, the thermistor 9, the flexible connection 10, the signal line 11, the controller 12 and the like are included.
As shown in fig. 1-2, the invention relates to an overload alarm non-tripping device of a temperature control type molded case circuit breaker, which comprises a current output terminal 1, wherein the current output terminal 1 and a static iron core 2 are riveted and fixed through a first rivet 3, the current output terminal 1 and a thermal element 5 are riveted and fixed through a second rivet 4, a screw hole is arranged on the thermal element 5, and the thermal element 5, a first ceramic plate 7 and a second ceramic plate 8 are fastened by screws 6. A thermistor 9 is provided in a cavity formed at the lower end of the first ceramic sheet 7 and the second ceramic sheet 8 after they are fastened by the screw 6. The thermistor 9 is connected to a signal line 11, and the signal line 11 is connected to a controller 12. The lower end of the thermal element 5 is connected with a flexible connection (copper strip) 10 by means of welding. The controller 12 is mounted on the circuit breaker housing.
The overload alarm non-tripping device of the temperature control type molded case circuit breaker is welded into a molded case circuit breaker main loop by a soft connection 10, under the condition that current does not overload in a circuit, the current enters the device through the soft connection 10, the current flows out of a current output terminal 1 through a thermal element 5, the current passes through the thermal element 5, the thermal element 5 heats a small amount, and the heat is conducted to a first ceramic sheet 7 and a second ceramic sheet 8 which are attached to the thermal element 5. The first ceramic sheet 7 and the second ceramic sheet 8 have good heat conductive properties and insulating properties. The thermistor 9 arranged in the cavity at the lower ends of the first ceramic plate 7 and the second ceramic plate 8 outputs a temperature signal. Is conducted to the controller 12 through the signal line 11, and the temperature value does not reach the set alarm temperature value. The controller 12 determines that the current in the circuit is not overloaded according to the signal, and does not alarm.
When overload occurs in the current, the current passes through the thermal element 5, so that the thermal element 5 generates heat, and the heat is conducted to the first ceramic sheet 7 and the second ceramic sheet 8 attached to the thermal element 5. The thermistor 9 arranged in the cavity at the lower end of the first ceramic plate 7 and the second ceramic plate 8 outputs a temperature signal. The current is conducted to the controller 12 through the signal line 11, at this time, the temperature value reaches a set alarm value, and the controller 12 judges that the current in the circuit is overloaded according to the temperature signal and immediately alarms.
When a short circuit occurs in the circuit, the static iron core 2 provides a magnetic field required for the action of the movable iron core of the circuit breaker.
As shown in fig. 3, the circuit of the controller 12 of the present invention includes a first reference voltage circuit, a second reference voltage circuit, a resistor R3, a thermal sensitive element RP1, resistors R5, R8, an operational amplifier U1B, an operational amplifier U2A, a diode D3, an operational amplifier U2B, a resistor R12, an NPN triode Q1, a diode D4, and a relay K1;
In the present embodiment, the thermosensitive element RP1 is a negative temperature coefficient thermosensitive element;
One end of the resistor R3 is connected with the positive voltage VCC, the other end of the resistor R3 is connected with one end of the heat sensitive element RP1, and the other end of the heat sensitive element RP1 is connected with the ground, the other end of the resistor R5 is connected with the inverting input end of the operational amplifier U1B and one end of the resistor R8, and the output end of the operational amplifier U1B is connected with the other end of the resistor R8 through a diode D2 which is arranged in the forward direction or is directly connected with the non-inverting input end of the operational amplifier U2A;
In the embodiment, a first reference voltage Vref1 is generated by a first reference voltage circuit, wherein the first reference voltage circuit comprises resistors R1 and R2, an operational amplifier U1A and resistors R6 and R7, one end of the resistor R1 is connected with a positive voltage VCC, the other end of the resistor R2 is connected with the non-inverting input end of the operational amplifier U1A, the other end of the resistor R2 is grounded, the inverting input end of the operational amplifier U1A is connected with the output end of the U1A and one end of the resistor R6, the other end of the resistor R6 is connected with one end of the resistor R7, and the first reference voltage Vref1 is obtained and is connected to the non-inverting input end of the operational amplifier U1B;
the inverting input end of the operational amplifier U2A is connected with the second reference voltage Vref2, the output end of the operational amplifier U2A is connected with the cathode of the diode D3, and the anode of the diode D3 is connected with the non-inverting input end of the operational amplifier U2B;
In the embodiment, the second reference voltage Vref2 is generated by a second reference voltage circuit, wherein the second reference voltage circuit comprises resistors R9 and R10, one end of the resistor R10 is connected with a positive voltage VCC, the other end of the resistor R9 is connected with one end of the resistor R9 and obtains the second reference voltage Vref2, the other end of the resistor R9 is grounded, and the resistor R9 can adopt an adjustable potentiometer so as to obtain different comparison reference voltages, namely the second reference voltage Vref2, so that the circuit can be applied to circuit breaker products with different specifications;
the inverting input end of the operational amplifier U2B is connected with a second reference voltage Vref2, the output end of the operational amplifier U2B is connected with the base electrode of the triode Q1 through a resistor R12, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of a coil of the relay K1 and the anode of the diode D4, and the other end of the coil of the relay K1 and the cathode of the diode D4 are connected with a positive voltage VDD;
normally open contact terminal block J1 of relay K1;
The positive voltages VCC and VDD may be generated by a power supply circuit, which is conventional in the art and is not described herein;
More preferably, in this embodiment, a delay circuit is further added, where the delay circuit includes a resistor R11 and a capacitor C3, one end of the resistor R11 is connected to the positive voltage VCC, the other end is connected to one end of the capacitor C3 and the non-inverting input end of the operational amplifier U2B, and the other end of the capacitor C3 is grounded.
In the embodiment, the control implementation mode of the circuit breaker is that a thermosensitive element RP1 is fixed on a heating element of the circuit breaker, the resistance value of the thermosensitive element RP1 changes in real time along with the change of temperature, positive voltage VCC is divided by resistors R1 and R2, the divided voltage value is input into a voltage follower formed by an operational amplifier U1A, when the circuit breaker is not overloaded, the resistance value of the thermosensitive element RP1 is larger, the upper voltage is larger, the operational amplifier U1B outputs low voltage, the operational amplifier U2A also outputs low voltage, a diode D3 is conducted, the voltage of the non-inverting input end of the operational amplifier U2B is pulled down, the operational amplifier U2B also outputs low voltage, a triode Q1 is not conducted, a relay K1 is not sucked, and an alarm signal is not output at a terminal row J1;
When the circuit breaker heats up due to overload, the resistance value of the thermosensitive element RP1 is reduced, the voltage on the thermosensitive element RP1 is reduced, when the temperature of the circuit breaker is higher than a set reference, the operational amplifier U1B is reversed and outputs a high level, the operational amplifier U2A also outputs a high level, the diode D3 is cut off, the non-inverting input end of the operational amplifier U2B is a high level and is higher than the second reference voltage Vref2, therefore, the U2B outputs a high level, the triode Q1 is conducted, the relay K1 is electrically attracted, and the terminal block J1 outputs an alarm signal;
In consideration of the problem of fluctuation interference of the error amplification voltage and the comparison reference voltage critical value, a delay circuit is added in the circuit, so that the problem is effectively avoided, and the delay time can be adjusted by changing the device parameters.
The circuit provided by the embodiment can be suitable for circuit breakers of various specifications, rated currents of the circuit breakers are different, temperatures during overload are slightly different, different comparison reference voltages can be obtained by adjusting the adjustable potentiometer R9, and the circuit can be applied to products of various specifications.
The circuit provided by the embodiment does not need to be provided with a diode D2 when being applied to single-path temperature acquisition and monitoring, and the first reference voltage circuit can adopt a simple two-resistance voltage dividing circuit;
The circuit provided by the embodiment can also be applied to multi-path temperature acquisition and monitoring, and then the diode D2 is needed, and the part of the circuit on the left side of the diode D2 in fig. 1 is simply repeated for multiple paths. Once the temperature of a certain loop of the circuit breaker reaches the overload temperature, the product can send out an overload alarm signal.
The mechanical structure of the circuit breaker is designed to be tripped when in short circuit and not tripped when in overload, and the application focuses on introducing a circuit, so that the mechanical structure of the circuit breaker is omitted.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (5)
1. A temperature control type molded case circuit breaker overload alarm non-tripping device is characterized by comprising a current output terminal (1), wherein a static iron core (2) and a thermal element (5) are installed on the current output terminal (1), a heat conducting insulating piece is installed on the thermal element (5), a thermistor (9) is installed in the heat conducting insulating piece, the thermistor (9) is connected with a signal wire (11), the signal wire (11) is connected with a controller (12), the thermal element (5) is connected with a flexible connection (10), the controller (12) is installed on a circuit breaker shell, the heat conducting insulating piece is a ceramic piece, the ceramic piece comprises a first ceramic piece (7) and a second ceramic piece (8), the first ceramic piece (7) and the second ceramic piece (8) are of a half-cavity structure, the thermal element (5) and the first ceramic piece (7) and the second ceramic piece (8) are connected through a screw (6), the first ceramic piece (7) and the second ceramic piece (8) are connected with a signal wire (11), and the other end of the ceramic piece (8) is connected with a signal wire (11).
2. The overload alarm non-tripping device for the temperature control type molded case circuit breaker is characterized in that the current output terminal (1) and the static iron core (2) are riveted and fixed through a first rivet (3).
3. The overload alarm non-tripping device for the temperature control type molded case circuit breaker according to claim 1 is characterized in that the current output terminal (1) and the thermal element (5) are riveted and fixed through a second rivet (4).
4. The overload alarm non-tripping device for the temperature control type molded case circuit breaker according to claim 1, wherein the thermal element (5) is connected with the soft connection (10) in a welding mode.
5. The overload alarm non-tripping device for the temperature control type molded case circuit breaker according to claim 1, wherein the flexible connection (10) is made of copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123734.0A CN112133608B (en) | 2020-10-20 | 2020-10-20 | A temperature-controlled molded case circuit breaker overload alarm non-tripping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123734.0A CN112133608B (en) | 2020-10-20 | 2020-10-20 | A temperature-controlled molded case circuit breaker overload alarm non-tripping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112133608A CN112133608A (en) | 2020-12-25 |
| CN112133608B true CN112133608B (en) | 2025-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011123734.0A Active CN112133608B (en) | 2020-10-20 | 2020-10-20 | A temperature-controlled molded case circuit breaker overload alarm non-tripping device |
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| CN (1) | CN112133608B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685728A (en) * | 2008-09-26 | 2010-03-31 | 浙江正泰电器股份有限公司 | Thermomagnetic tripper of breaker |
| CN102543595A (en) * | 2011-12-26 | 2012-07-04 | 王福起 | Circuit breaker |
| CN107154325A (en) * | 2016-03-02 | 2017-09-12 | 浙江正泰电器股份有限公司 | The overload-alarm non-tripping device of breaker |
| CN206992027U (en) * | 2017-07-11 | 2018-02-09 | 德力西电气有限公司 | A kind of breaker with overload-alarm non-tripping function |
| CN213071042U (en) * | 2020-10-20 | 2021-04-27 | 罗格朗低压电器（无锡）有限公司 | Overload alarm non-tripping device for temperature control type molded case circuit breaker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5333289B2 (en) * | 2010-02-25 | 2013-11-06 | 三菱電機株式会社 | Circuit breaker |
| CN106876220B (en) * | 2015-12-14 | 2020-02-18 | 浙江正泰电器股份有限公司 | Thermal overload alarm non-tripping device of circuit breaker |
| CN206834143U (en) * | 2017-06-28 | 2018-01-02 | 德力西电气有限公司 | The overload-alarm non-tripping device and breaker of a kind of breaker |
-
2020
- 2020-10-20 CN CN202011123734.0A patent/CN112133608B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685728A (en) * | 2008-09-26 | 2010-03-31 | 浙江正泰电器股份有限公司 | Thermomagnetic tripper of breaker |
| CN102543595A (en) * | 2011-12-26 | 2012-07-04 | 王福起 | Circuit breaker |
| CN107154325A (en) * | 2016-03-02 | 2017-09-12 | 浙江正泰电器股份有限公司 | The overload-alarm non-tripping device of breaker |
| CN206992027U (en) * | 2017-07-11 | 2018-02-09 | 德力西电气有限公司 | A kind of breaker with overload-alarm non-tripping function |
| CN213071042U (en) * | 2020-10-20 | 2021-04-27 | 罗格朗低压电器（无锡）有限公司 | Overload alarm non-tripping device for temperature control type molded case circuit breaker |
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| Publication number | Publication date |
|---|---|
| CN112133608A (en) | 2020-12-25 |
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