CN220985314U - Pre-detection protection circuit of feeder cabinet - Google Patents
Pre-detection protection circuit of feeder cabinet Download PDFInfo
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- CN220985314U CN220985314U CN202322571291.7U CN202322571291U CN220985314U CN 220985314 U CN220985314 U CN 220985314U CN 202322571291 U CN202322571291 U CN 202322571291U CN 220985314 U CN220985314 U CN 220985314U
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 27
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of protection circuits, in particular to a pre-detection protection circuit of a feeder cabinet, which comprises a protection circuit, a detection circuit, a main control chip, a temperature measurement circuit and an LCD display screen, wherein the protection circuit is used for cutting off the circuit when an accident occurs, the detection circuit comprises a voltage reduction circuit and a signal circuit, the voltage reduction circuit is used for converting a current signal and reducing the voltage, the signal circuit is used for outputting a high level when the accident occurs, the signal circuit is electrically connected with the main control chip, and the temperature measurement circuit and the LCD display screen are electrically connected with the main control chip. According to the utility model, the working condition of the protection circuit is detected through the detection circuit, when an accident occurs, the detection circuit can output high level to drive the main control chip to work, the main control chip drives the temperature measuring circuit to detect temperature, and the storage module records temperature data and the LCD display screen to display the temperature data, so that the follow-up maintenance is facilitated.
Description
Technical Field
The utility model relates to the technical field of protection circuits, in particular to a pre-detection protection circuit of a feeder cabinet.
Background
The feeder cabinet is a common power distribution cabinet, a plurality of circuits are arranged in the feeder cabinet, and when the feeder cabinet is used, corresponding protection circuits are required to be matched.
The utility model patent with the bulletin number of CN216290169U discloses a double-leakage protection power distribution cabinet, which comprises a cabinet body, wherein a circuit breaker is arranged in the cabinet body; the main leakage protection module comprises a first zero sequence current transformer, a leakage protection circuit and a tripping coil; the auxiliary leakage protection module comprises a second zero sequence current transformer, an MCU, a state monitoring circuit and a motor.
Although the main leakage protection module and the auxiliary leakage protection module which are mutually independent are arranged on the circuit breaker, the double leakage protection can be realized by adopting two different leakage protection implementation modes, the possibility of leakage and electric shock accidents is reduced, and when the accidents happen, whether the accidents are caused by temperature or not can not be known, so that the follow-up maintenance is troublesome.
Disclosure of utility model
The utility model aims to provide a pre-detection protection circuit of a feeder cabinet, which is used for solving the problem that whether an accident is caused by temperature or not cannot be known in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
The pre-detection protection circuit comprises a protection circuit, a detection circuit, a main control chip, a temperature measurement circuit and an LCD display screen, wherein the protection circuit is used for cutting off the circuit when an accident occurs, the detection circuit comprises a voltage reduction circuit and a signal circuit, the voltage reduction circuit is used for converting a current signal and reducing the voltage, the signal circuit is used for outputting a high level when the accident occurs, the signal circuit is electrically connected with the main control chip, and the temperature measurement circuit and the LCD display screen are electrically connected with the main control chip;
The protection circuit comprises a current transformer TA for measuring zero line and live line currents, the current transformer TA is connected with a second capacitor C2 and a first rectifying circuit which are connected in parallel, the output end of the first rectifying circuit is connected with a third capacitor C3, a second resistor R2 and a fourth capacitor C4 which are connected in parallel, a second switch S2 is arranged on the zero line and the live line, a first capacitor C1 is arranged between the zero line and the live line, the first switch S1 and the first resistor R1 are connected in series and then connected with the first capacitor C1 in parallel, a direct current tripping device KM, a thyristor VS and a fifth diode VD5 which are connected in series are also arranged between the zero line and the live line, the anode of the thyristor VS is connected with the direct current tripping device KM, the cathode of the thyristor VS is connected with the anode of the fifth diode VS 5, the gate of the thyristor is connected with one output end of the first rectifying circuit, and the other output end of the first rectifying circuit is connected between the anode of the fifth diode VS 5 and the cathode of the thyristor VS;
The step-down circuit comprises a second rectifying circuit with two input ends respectively connected with a zero line and a fire wire, a fifth capacitor C5 is connected between the input end of the second rectifying circuit and the fire wire, the two ends of the fifth capacitor C5 are connected with a third resistor R3 in parallel, and a sixth capacitor C6 and a zener diode DW which are connected in parallel are connected between the output ends of the second rectifying circuit.
Preferably, the signal circuit comprises a fourth resistor R4 and a fifth resistor R5 which are connected in parallel with two ends of the zener diode DW, the signal circuit further comprises a voltage comparator and a reference voltage circuit, the reference voltage circuit comprises a power supply, a sixth resistor R6 and a seventh resistor R7, the non-inverting input end of the voltage comparator is connected between the sixth resistor R6 and the seventh resistor R7, the inverting input end of the voltage comparator is connected between the fourth resistor R4 and the fifth resistor R5, and the output end of the voltage comparator is connected with the main control chip.
Preferably, when the second switch S2 is closed, the detection voltage V1 at the inverting input of the voltage comparator is greater than the reference voltage V2 at the non-inverting input.
Preferably, a detection module, a control module and a storage module are arranged in the main control chip, the detection module is used for detecting the high-low level input by the output end of the voltage comparator, the control module is used for controlling the temperature measuring circuit and the LCD display screen to work, and the storage module is used for storing the temperature information measured by the temperature measuring circuit.
Preferably, the temperature measuring circuit comprises a temperature measuring chip U2, a power supply anode pin of the temperature measuring chip U2 is connected with a power supply, an eighth resistor R8 is connected between the output end of the temperature measuring chip U2 and the power supply, and a power supply cathode pin of the temperature measuring chip U2 is grounded.
Compared with the prior art, the utility model has the beneficial effects that:
According to the utility model, the detection circuit is arranged, the protection circuit drives the direct current release KM to disconnect the second switch S2 when an accident occurs, then the detection voltage V1 output by the signal circuit becomes zero, the reference voltage V2 is larger than the detection voltage V1, the voltage comparator outputs a high level, the detection module in the main control chip detects the high level, the control module controls the temperature measuring circuit to work, measures the temperature when the accident occurs, judges whether the abnormal high temperature condition occurs, stores temperature data by the storage module, and displays the temperature data by the LCD display screen, thereby facilitating the understanding of whether the abnormal temperature occurs and facilitating the subsequent overhaul.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the utility model;
FIG. 2 is a circuit diagram of a protection circuit, a detection circuit and a main control chip in the utility model;
FIG. 3 is a circuit diagram of the protection circuit of the utility model;
FIG. 4 is a circuit diagram of a detection circuit according to the present utility model;
FIG. 5 is a circuit diagram of a main control chip, a temperature measuring circuit and an LCD display screen in the utility model.
In the figure:
1. A protection circuit;
2. a detection circuit; 20. a step-down circuit; 21. a signal circuit;
3. A main control chip; 30. a detection module; 31. a control module; 32. a storage module;
4. a temperature measuring circuit;
5. an LCD display screen.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-5, the present utility model provides the following technical solutions:
The utility model provides a protection circuit is examined in advance to feeder cabinet, including protection circuit 1, detection circuit 2, main control chip 3, temperature measurement circuit 4 and LCD display 5, protection circuit 1 is used for cutting off the circuit when taking place the accident, detection circuit 2 includes step-down circuit 20 and signal circuit 21, step-down circuit 20 is used for changing the current signal and steps down, signal circuit 21 is used for outputting high level when taking place the accident, electric connection between signal circuit 21 and main control chip 3, temperature measurement circuit 4 and LCD display 5 all with main control chip 3 electric connection, record feeder cabinet internal temperature when the accident takes place, follow-up maintenance of being convenient for.
In this embodiment, the protection circuit 1 includes a current transformer TA for measuring the current of the zero line and the live line, the current transformer TA is connected with a second capacitor C2 and a first rectifying circuit in parallel, the output end of the first rectifying circuit is connected with a third capacitor C3, a second resistor R2 and a fourth capacitor C4 in parallel, a second switch S2 is installed on the zero line and the live line, a first capacitor C1 is installed between the zero line and the live line, the first switch S1 and the first resistor R1 are connected in series and then connected in parallel with the first capacitor C1, a dc trip KM, a thyristor VS and a fifth diode VD5 are also installed between the zero line and the live line in series, the anode of the thyristor VS is connected with the dc trip KM, the cathode of the thyristor VS is connected with the anode of the fifth diode VD5, the gate of the thyristor VS is connected with one output end of the first rectifying circuit, the other output end of the first rectifying circuit is connected between the anode of the fifth diode VD5 and the cathode of the thyristor VS, the thyristor VS is NEC2P4M for controlling the power supply of the dc trip TA, and the current transformer is disconnected from the winding when the zero line and the current transformer S is disconnected from the winding 2.
Specifically, the voltage step-down circuit 20 includes a second rectifying circuit with two input ends respectively connected with a zero line and a live line, a fifth capacitor C5 is connected between the input end of the second rectifying circuit and the live line, two ends of the fifth capacitor C5 are connected in parallel with a third resistor R3, a sixth capacitor C6 and a zener diode DW are connected in parallel between the output ends of the second rectifying circuit, the fifth capacitor C5 and the third resistor R3 form a resistance-capacitance voltage step-down circuit, the second rectifying circuit converts alternating current into direct current, and then the alternating current is filtered by the sixth capacitor C6 and stabilized by the zener diode DW to change the alternating current voltage into a detection voltage V1.
Further, the signal circuit 21 includes a fourth resistor R4 and a fifth resistor R5 connected in parallel to two ends of the zener diode DW, the signal circuit 21 further includes a voltage comparator and a reference voltage circuit, the reference voltage circuit includes a power source, a sixth resistor R6 and a seventh resistor R7, the non-inverting input end of the voltage comparator is connected between the sixth resistor R6 and the seventh resistor R7, the inverting input end of the voltage comparator is connected between the fourth resistor R4 and the fifth resistor R5, the output end of the voltage comparator is connected with the main control chip 3, and the voltage is compared by the voltage comparator, so as to output a high level or a low level.
Further, when the second switch S2 is closed, the detection voltage V1 at the inverting input terminal of the voltage comparator is greater than the reference voltage V2 at the non-inverting input terminal, so that the voltage comparator output terminal outputs a low level under normal conditions.
It should be noted that, the main control chip 3 is provided with a detection module 30, a control module 31 and a storage module 32, the detection module 30 is used for detecting the high-low level input by the output end of the voltage comparator, when the detection module 30 detects the high level, the control module 31 works, the control module 31 is used for controlling the temperature measuring circuit 4 and the LCD display 5 to work, and the storage module 32 is used for storing the temperature information measured by the temperature measuring circuit 4.
It is noted that the temperature measuring circuit 4 comprises a temperature measuring chip U2, a power anode pin of the temperature measuring chip U2 is connected with a power supply, an eighth resistor R8 is connected between the output end of the temperature measuring chip U2 and the power supply, a power cathode pin of the temperature measuring chip U2 is grounded, and the temperature measuring chip U2 is DS18B20.
When the pre-detection protection circuit of the feeder cabinet is used, the protection circuit 1 performs leakage protection on the circuit, when a leakage accident occurs, the current transformer TA detects abnormal current in a zero line and a live line, the thyristor VS controls the coil of the direct current release KM to be electrified, the second switch S2 is disconnected, and the circuit is disconnected for protecting the safety of the circuit;
When the zero line and the live line normally work, the detection voltage V1 is input to the inverting input end of the voltage comparator through the resistance-capacitance voltage reduction circuit, the second rectifying circuit and the sixth capacitor C6 filtering and the voltage stabilizing diode DW in the voltage reduction circuit 20, the detection voltage V1 is larger than the reference voltage V2 of the non-inverting input end, the output end of the voltage comparator outputs a low level, after the circuit is disconnected, the detection voltage V1 drops to zero, the output end of the voltage comparator outputs a high level, the detection module 30 in the main control chip 3 drives the control module 31 to work after detecting the high level, the temperature measuring circuit 4 and the LCD display screen 5 work along with the high level, the temperature measuring chip U2 in the temperature measuring circuit 4 works and transmits temperature data to the storage module 32 in the main control chip 3, the storage module 32 records the temperature data and is displayed by the LCD display screen 5, the temperature during power failure can be recorded and displayed, and follow-up maintenance is convenient.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a protection circuit is examined in advance to feeder cabinet, includes protection circuit (1), detection circuit (2), main control chip (3), temperature measurement circuit (4) and LCD display screen (5), its characterized in that: the protection circuit (1) is used for cutting off a circuit when an accident occurs, the detection circuit (2) comprises a voltage reduction circuit (20) and a signal circuit (21), the voltage reduction circuit (20) is used for converting a current signal and reducing the voltage, the signal circuit (21) is used for outputting a high level when the accident occurs, the signal circuit (21) is electrically connected with the main control chip (3), and the temperature measurement circuit (4) and the LCD display screen (5) are electrically connected with the main control chip (3);
The protection circuit (1) comprises a current transformer TA for measuring the current of a zero line and a live line, wherein the current transformer TA is connected with a second capacitor C2 and a first rectifying circuit which are connected in parallel, the output end of the first rectifying circuit is connected with a third capacitor C3, a second resistor R2 and a fourth capacitor C4 which are connected in parallel, a second switch S2 is arranged on the zero line and the live line, a first capacitor C1 is arranged between the zero line and the live line, the first switch S1 and the first resistor R1 are connected in series and then connected with the first capacitor C1 in parallel, a direct current release KM, a thyristor VS and a fifth diode VD5 which are connected in series are also arranged between the zero line and the live line, the anode of the thyristor VS is connected with the direct current release KM, the cathode of the thyristor VS is connected with the anode of the fifth diode VD5, the gate of the thyristor VS is connected with one output end of the first rectifying circuit, and the other output end of the first rectifying circuit is connected between the anode of the fifth diode VD5 and the cathode of the thyristor VS;
The step-down circuit (20) comprises a second rectifying circuit with two input ends respectively connected with a zero line and a fire line, a fifth capacitor C5 is connected between the input end of the second rectifying circuit and the fire line, the two ends of the fifth capacitor C5 are connected with a third resistor R3 in parallel, and a sixth capacitor C6 and a zener diode DW which are connected in parallel are connected between the output ends of the second rectifying circuit.
2. The feeder cabinet pre-detection protection circuit of claim 1, wherein: the signal circuit (21) comprises a fourth resistor R4 and a fifth resistor R5 which are connected in parallel with two ends of the voltage stabilizing diode DW, the signal circuit (21) further comprises a voltage comparator and a reference voltage circuit, the reference voltage circuit comprises a power supply, a sixth resistor R6 and a seventh resistor R7, the non-inverting input end of the voltage comparator is connected between the sixth resistor R6 and the seventh resistor R7, the inverting input end of the voltage comparator is connected between the fourth resistor R4 and the fifth resistor R5, and the output end of the voltage comparator is connected with the main control chip (3).
3. The feeder cabinet pre-detection protection circuit of claim 1, wherein: when the second switch S2 is closed, the detection voltage V1 at the inverting input of the voltage comparator is greater than the reference voltage V2 at the non-inverting input.
4. The feeder cabinet pre-detection protection circuit of claim 1, wherein: the main control chip (3) is internally provided with a detection module (30), a control module (31) and a storage module (32), wherein the detection module (30) is used for detecting the high level and the low level input by the output end of the voltage comparator, the control module (31) is used for controlling the temperature measuring circuit (4) and the LCD display screen (5) to work, and the storage module (32) is used for storing the temperature information measured by the temperature measuring circuit (4).
5. The feeder cabinet pre-detection protection circuit of claim 1, wherein: the temperature measuring circuit (4) comprises a temperature measuring chip U2, a power supply anode pin of the temperature measuring chip U2 is connected with a power supply, an eighth resistor R8 is connected between the output end of the temperature measuring chip U2 and the power supply, and a power supply cathode pin of the temperature measuring chip U2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322571291.7U CN220985314U (en) | 2023-09-21 | 2023-09-21 | Pre-detection protection circuit of feeder cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322571291.7U CN220985314U (en) | 2023-09-21 | 2023-09-21 | Pre-detection protection circuit of feeder cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220985314U true CN220985314U (en) | 2024-05-17 |
Family
ID=91040528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322571291.7U Active CN220985314U (en) | 2023-09-21 | 2023-09-21 | Pre-detection protection circuit of feeder cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220985314U (en) |
-
2023
- 2023-09-21 CN CN202322571291.7U patent/CN220985314U/en active Active
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