CN221078902U - Leakage detection protection circuit of withstand voltage test unit of electric energy meter - Google Patents
Leakage detection protection circuit of withstand voltage test unit of electric energy meter Download PDFInfo
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- CN221078902U CN221078902U CN202323008731.4U CN202323008731U CN221078902U CN 221078902 U CN221078902 U CN 221078902U CN 202323008731 U CN202323008731 U CN 202323008731U CN 221078902 U CN221078902 U CN 221078902U
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 230000015556 catabolic process Effects 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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Abstract
The utility model discloses a leakage detection protection circuit of an electric energy meter withstand voltage test unit, which relates to the field of electric energy meters, and comprises the following components: the leakage detection module is used for detecting whether the leakage current exceeds the breakdown alarm current or not, and providing a voltage signal for the leakage triggering module when the leakage current exceeds the breakdown alarm current; the leakage triggering module is used for triggering the power-off control module to work when receiving the voltage signal of the leakage detection module; the power-off control module is used for disconnecting the wiring loop of the electric energy meter during working; the false triggering prompt module is used for giving out a luminous prompt when the illumination causes false triggering; the power supply module is used for supplying power to the electric leakage triggering module, the power-off control module and the false triggering prompt module; compared with the prior art, the utility model has the beneficial effects that: when light is directly irradiated on the power-off control module to cause false triggering of the power-off control module, the false triggering prompting module controls the light-emitting diode to emit light or not according to the light intensity change, and reminds related personnel of false triggering to know the fault reason.
Description
Technical Field
The utility model relates to the field of electric energy meters, in particular to a leakage detection protection circuit of an electric energy meter withstand voltage test unit.
Background
The electric energy meter is an instrument for measuring electric energy, measures electric energy data consumed by a circuit and calculates electric energy consumed by each unit. The reliability of the national power grid to the electric energy meter needs to be ensured, the withstand voltage test belongs to an important test item, and in the production process of the electric energy meter, the electric energy meter is subjected to the withstand voltage test through an automatic verification assembly line, and whether the withstand voltage test unit is qualified or not is detected.
The withstand voltage test unit has leakage current detection and breakdown protection functions, and when the leakage current is larger than the preset breakdown alarm current, the electric energy meter is automatically cut off, so that the damage of the leakage current to related personnel is prevented.
When the existing withstand voltage test unit detects that the leakage current exceeds the breakdown alarm current, the power-off device is triggered to disconnect the electric energy meter, but the power-off device can generate false triggering conditions, and related personnel are difficult to distinguish the fault reason of the electric energy meter, so that improvement is needed.
Disclosure of utility model
The utility model aims to provide a leakage detection protection circuit of an electric energy meter withstand voltage test unit, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
An electric energy meter withstand voltage test unit leakage detection protection circuit includes:
the leakage detection module is used for detecting whether the leakage current exceeds the breakdown alarm current or not, and providing a voltage signal for the leakage triggering module when the leakage current exceeds the breakdown alarm current;
The leakage triggering module is used for triggering the power-off control module to work when receiving the voltage signal of the leakage detection module;
The power-off control module is used for disconnecting the wiring loop of the electric energy meter during working;
The false triggering prompt module is used for giving out a luminous prompt when the illumination causes false triggering;
The power supply module is used for supplying power to the electric leakage triggering module, the power-off control module and the false triggering prompt module;
The leakage detection module is connected with the leakage trigger module, the leakage trigger module is connected with the power-off control module, and the power supply module is connected with the leakage trigger module, the power-off control module and the false trigger prompt module.
As still further aspects of the utility model: the leakage detection module comprises an electric energy meter X, a switch S1, a switch S2, a diode D2, a capacitor C3, a resistor R3 and a diode D3, wherein the first end of the electric energy meter X is connected with a live wire L through the switch S1, the second end of the electric energy meter X is connected with a zero line N through the switch S2, the shell of the electric energy meter X is connected with the positive electrode of the diode D2 through a wire, the negative electrode of the diode D2 is connected with one end of the capacitor C3 and one end of the resistor R3, the other end of the capacitor C3 is grounded, the other end of the resistor R3 is connected with the negative electrode of the diode D3, and the positive electrode of the diode D3 is connected with a leakage triggering module.
As still further aspects of the utility model: the leakage triggering module comprises an integrated circuit U1, the model of the integrated circuit U1 is CD4017, a 14-number pin of the integrated circuit U1 is connected with the leakage detection module, a 8-number pin, a 13-number pin and a 15-number pin of the integrated circuit U1 are grounded, a 11-number pin of the integrated circuit U1 is connected with the power-off control module, a 16-number pin of the integrated circuit U1 is connected with one end of a resistor R4 and a power supply module, the other end of the resistor R4 is connected with the anode of a diode D4, and the cathode of the diode D4 is grounded.
As still further aspects of the utility model: the power-off control module comprises a silicon controlled rectifier Z1, a resistor R5, a light emitting diode D5, a relay J and a diode D6, wherein the anode of the silicon controlled rectifier Z1 is connected with the power supply module, the control electrode of the silicon controlled rectifier Z1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the leakage trigger module, the cathode of the silicon controlled rectifier Z1 is connected with the anode of the diode D5, the cathode of the diode D5 is connected with one end of the relay J and the cathode of the diode D6, the other end of the relay J is grounded, and the anode of the diode D6 is grounded.
As still further aspects of the utility model: the false triggering prompt module comprises a resistor R6, a resistor R7, a photoresistor RG, a diode D7, an amplifier U2 and a diode D8, wherein one end of the resistor R6 is connected with one end of the resistor R7 and the power supply module, the other end of the resistor R6 is connected with one end of the photoresistor RG and the inverting end of the amplifier U2, the other end of the photoresistor RG is grounded, the other end of the resistor R7 is connected with the cathode of the diode D7 and the same-phase end of the amplifier U2, the anode of the diode D7 is grounded, the output end of the amplifier U2 is connected with the anode of the diode D8, and the cathode of the diode D8 is grounded.
Compared with the prior art, the utility model has the beneficial effects that: when light is directly irradiated on the power-off control module to cause false triggering of the power-off control module, the false triggering prompting module controls the light-emitting diode to emit light or not according to the light intensity change, and reminds related personnel of false triggering to know the fault reason.
Drawings
Fig. 1 is a schematic diagram of a leakage detection protection circuit of a withstand voltage test unit of an electric energy meter.
Fig. 2 is a circuit diagram of a power supply module.
Fig. 3 is a circuit diagram of a leakage detection protection circuit of an electric energy meter withstand voltage test unit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, an electric leakage detection protection circuit of an electric energy meter withstand voltage test unit includes:
the leakage detection module is used for detecting whether the leakage current exceeds the breakdown alarm current or not, and providing a voltage signal for the leakage triggering module when the leakage current exceeds the breakdown alarm current;
The leakage triggering module is used for triggering the power-off control module to work when receiving the voltage signal of the leakage detection module;
The power-off control module is used for disconnecting the wiring loop of the electric energy meter during working;
The false triggering prompt module is used for giving out a luminous prompt when the illumination causes false triggering;
The power supply module is used for supplying power to the electric leakage triggering module, the power-off control module and the false triggering prompt module;
The leakage detection module is connected with the leakage trigger module, the leakage trigger module is connected with the power-off control module, and the power supply module is connected with the leakage trigger module, the power-off control module and the false trigger prompt module.
In particular embodiments: referring to fig. 2, a power supply module introduces voltage through a live wire L and a zero wire N, completes voltage reduction processing through a transformer W, completes ac-dc conversion through a rectifier T, completes filtering processing through a filter circuit formed by a capacitor C1, an inductor L1 and a capacitor C2, outputs stable direct current through a voltage stabilizer U1, and supplies power to a leakage triggering module, a power-off control module and a false triggering prompt module.
In this embodiment: referring to fig. 3, the leakage detection module includes an electric energy meter X, a switch S1, a switch S2, a diode D2, a capacitor C3, a resistor R3, and a diode D3, wherein a first end of the electric energy meter X is connected with a live wire L through the switch S1, a second end of the electric energy meter X is connected with a zero line N through the switch S2, a shell of the electric energy meter X is connected with an anode of the diode D2 through a wire, a cathode of the diode D2 is connected with one end of the capacitor C3 and one end of the resistor R3, the other end of the capacitor C3 is grounded, the other end of the resistor R3 is connected with a cathode of the diode D3, and an anode of the diode D3 is connected with the leakage triggering module.
The electric energy meter X is connected to the live wire and the zero line through the switch S1 and the switch S2 respectively, so that the power consumption conditions of loads on the branch live wire and the zero line are measured, when the electric energy meter X leaks electricity, the shell of the electric energy meter X is electrified, so that the shell of the electric energy meter X is connected with the diode D2, the capacitor C3, the resistor R3 and the diode D3 through wires, and when the leakage current is smaller, the voltage stabilizing diode D3 cannot be broken down, and a voltage signal cannot be output for the leakage triggering module; when the leakage current reaches the breakdown alarm current, the breakdown voltage stabilizing diode D3 outputs a voltage signal for the leakage trigger module.
In this embodiment: referring to fig. 3, the leakage triggering module includes an integrated circuit U1, the model of the integrated circuit U1 is CD4017, the No. 14 pin of the integrated circuit U1 is connected to the leakage detection module, the No. 8 pin, the No. 13 pin and the No. 15 pin of the integrated circuit U1 are grounded, the No. 11 pin of the integrated circuit U1 is connected to the power-off control module, the No. 16 pin of the integrated circuit U1 is connected to one end of the resistor R4 and the power supply module, the other end of the resistor R4 is connected to the anode of the diode D4, and the cathode of the diode D4 is grounded.
Since the input impedance of the CMOS integrated circuit CD4017 is very high, a clock signal can be formed when a voltage signal of sufficient strength (breakdown zener diode D3, sufficient strength) is input. The pin 11 of the CD4017 counter triggers the power-off control module to work.
In this embodiment: referring to fig. 3, the power-off control module includes a thyristor Z1, a resistor R5, a light emitting diode D5, a relay J, and a diode D6, wherein the positive electrode of the thyristor Z1 is connected to the power supply module, the control electrode of the thyristor Z1 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the leakage trigger module, the negative electrode of the thyristor Z1 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to one end of the relay J and the negative electrode of the diode D6, the other end of the relay J is grounded, and the positive electrode of the diode D6 is grounded.
After the silicon controlled rectifier Z1 is conducted, the relay J is driven to work, the switch S1 and the switch S2 are sprung to open, the wiring loop of the electric energy meter X is disconnected, the electric energy meter is powered off, and meanwhile the light emitting diode D5 emits light to indicate the working state.
In this embodiment: referring to fig. 3, the false triggering prompt module includes a resistor R6, a resistor R7, a photo resistor RG, a diode D7, an amplifier U2, and a diode D8, wherein one end of the resistor R6 is connected to one end of the resistor R7 and the power supply module, the other end of the resistor R6 is connected to one end of the photo resistor RG and the opposite end of the amplifier U2, the other end of the photo resistor RG is grounded, the other end of the resistor R7 is connected to the negative electrode of the diode D7 and the same-phase end of the amplifier U2, the positive electrode of the diode D7 is grounded, the output end of the amplifier U2 is connected to the positive electrode of the diode D8, and the negative electrode of the diode D8 is grounded.
When the silicon controlled rectifier irradiates light, false triggering can be caused, and at the moment, even if the integrated circuit U1 does not output a triggering signal, the silicon controlled rectifier Z1 is still on, and the wiring loop of the electric energy meter X is disconnected; when the silicon controlled rectifier Z1 is misled, the resistance value of the light sensitive resistor RG (the larger the light intensity is, the smaller the resistance value is) is small, so that the voltage of the in-phase end of the amplifier U2 is higher than the voltage of the opposite-phase end, the amplifier U2 outputs high level, and the light emitting diode D8 emits light to indicate that the silicon controlled rectifier Z1 is mistriggered.
The working principle of the utility model is as follows: the leakage detection module detects whether leakage current exceeds breakdown alarm current, when the leakage current exceeds breakdown alarm current, a voltage signal is provided for the leakage trigger module, when the leakage trigger module receives the voltage signal of the leakage detection module, the power-off control module is triggered to work, the power-off control module is disconnected from the wiring loop of the electric energy meter during work, the false triggering prompt module emits light to prompt when illumination causes false triggering, and the power supply module supplies power for the leakage trigger module, the power-off control module and the false triggering prompt module.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. The utility model provides an electric energy meter withstand voltage test unit electric leakage detection protection circuit which characterized in that:
the leakage detection protection circuit of the withstand voltage test unit of the electric energy meter comprises:
the leakage detection module is used for detecting whether the leakage current exceeds the breakdown alarm current or not, and providing a voltage signal for the leakage triggering module when the leakage current exceeds the breakdown alarm current;
The leakage triggering module is used for triggering the power-off control module to work when receiving the voltage signal of the leakage detection module;
The power-off control module is used for disconnecting the wiring loop of the electric energy meter during working;
The false triggering prompt module is used for giving out a luminous prompt when the illumination causes false triggering;
The power supply module is used for supplying power to the electric leakage triggering module, the power-off control module and the false triggering prompt module;
The leakage detection module is connected with the leakage trigger module, the leakage trigger module is connected with the power-off control module, and the power supply module is connected with the leakage trigger module, the power-off control module and the false trigger prompt module.
2. The electric leakage detection protection circuit of the withstand voltage test unit of the electric energy meter according to claim 1, wherein the electric leakage detection module comprises an electric energy meter X, a switch S1, a switch S2, a diode D2, a capacitor C3, a resistor R3 and a diode D3, wherein a first end of the electric energy meter X is connected with a live wire L through the switch S1, a second end of the electric energy meter X is connected with a zero line N through the switch S2, a shell of the electric energy meter X is connected with an anode of the diode D2 through a wire, a cathode of the diode D2 is connected with one end of the capacitor C3 and one end of the resistor R3, the other end of the capacitor C3 is grounded, the other end of the resistor R3 is connected with a cathode of the diode D3, and an anode of the diode D3 is connected with the electric leakage triggering module.
3. The leakage detection protection circuit of the withstand voltage test unit of the electric energy meter according to claim 1, wherein the leakage triggering module comprises an integrated circuit U1, the model of the integrated circuit U1 is CD4017, pins 14 of the integrated circuit U1 are connected with the leakage detection module, pins 8, 13 and 15 of the integrated circuit U1 are grounded, pin 11 of the integrated circuit U1 is connected with the power-off control module, pin 16 of the integrated circuit U1 is connected with one end of a resistor R4 and a power supply module, the other end of the resistor R4 is connected with the anode of a diode D4, and the cathode of the diode D4 is grounded.
4. The leakage detection protection circuit of the withstand voltage test unit of the electric energy meter according to claim 1, wherein the power-off control module comprises a silicon controlled rectifier Z1, a resistor R5, a light emitting diode D5, a relay J and a diode D6, the anode of the silicon controlled rectifier Z1 is connected with the power supply module, the control electrode of the silicon controlled rectifier Z1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the leakage trigger module, the cathode of the silicon controlled rectifier Z1 is connected with the anode of the diode D5, the cathode of the diode D5 is connected with one end of the relay J and the cathode of the diode D6, the other end of the relay J is grounded, and the anode of the diode D6 is grounded.
5. The electric leakage detection protection circuit of the withstand voltage test unit of the electric energy meter according to claim 4, wherein the false triggering prompt module comprises a resistor R6, a resistor R7, a photoresistor RG, a diode D7, an amplifier U2 and a diode D8, one end of the resistor R6 is connected with one end of the resistor R7 and the power supply module, the other end of the resistor R6 is connected with one end of the photoresistor RG and the opposite end of the amplifier U2, the other end of the photoresistor RG is grounded, the other end of the resistor R7 is connected with the negative electrode of the diode D7 and the same-phase end of the amplifier U2, the positive electrode of the diode D7 is grounded, the output end of the amplifier U2 is connected with the positive electrode of the diode D8, and the negative electrode of the diode D8 is grounded.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221078902U true CN221078902U (en) | 2024-06-04 |
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