CN116008862A - Grounding detection method for ammeter after switching off - Google Patents
Grounding detection method for ammeter after switching off Download PDFInfo
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- CN116008862A CN116008862A CN202310280635.0A CN202310280635A CN116008862A CN 116008862 A CN116008862 A CN 116008862A CN 202310280635 A CN202310280635 A CN 202310280635A CN 116008862 A CN116008862 A CN 116008862A
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 230000005611 electricity Effects 0.000 claims description 38
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 5
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Abstract
The invention relates to a grounding detection method after ammeter switching-on, which comprises a grounding detection circuit arranged in an ammeter and a relay K for controlling the on-off of a power supply in the ammeter, wherein two ends of the grounding detection circuit are respectively connected with a live wire input end and a live wire output end of the relay K, an ammeter MCU controls the relay K to keep a switching-on state or switch on according to the high and low levels of the output end of the grounding detection circuit, the live wire output end of the ammeter is connected with an electric appliance RL, and the grounding detection circuit mainly comprises a resistor voltage division circuit, a half-wave rectification filter circuit and a triode Q. According to the invention, through the arrangement of the grounding detection circuit, after the relay in the meter is opened, whether the grounding fault exists is detected through the grounding detection circuit, if the grounding fault exists, the opening is maintained, and if the grounding fault exists, the switching-on is performed. The electric power staff is not required to carry out field maintenance, and the manpower is saved.
Description
Technical Field
The invention relates to the technical field of electric meters, in particular to a grounding detection method after an electric meter is opened.
Background
In some countries or places, due to the shortage of electricity, the electricity utilization environment is bad, and users often steal electricity in a zero line grounding mode. The zero line grounding electricity stealing mode is as follows: the current directly flows into the ground from the zero line and does not flow into the electric energy meter, so that the zero line and the live line of the electric energy meter are unbalanced. When the current is unbalanced, the relay in the meter adopts a brake-pulling mode, so that the purpose of avoiding fraudulent use of electricity is achieved. However, in the prior art, after the electricity stealing mode is removed, the personnel of the electric company are required to go to the site to perform maintenance and closing, which is troublesome.
Disclosure of Invention
In order to overcome the defect that field maintenance is required after the ground fault is removed, the invention provides a method for detecting the ground condition and closing the electric meter after the ground fault is removed.
The invention is realized by the following technical scheme:
the electric meter switching-off grounding detection method comprises a grounding detection circuit arranged in an electric meter and a relay K for controlling the on-off of a power supply in the electric meter, wherein two ends of the grounding detection circuit are respectively connected with a live wire input end and a live wire output end of the relay K, the output end of the grounding detection circuit is connected with the input end of an electric meter MCU, and the electric meter MCU controls the relay K to keep a switching-off state or switch on according to the high and low levels of the output end of the grounding detection circuit;
the live wire output end of the ammeter is connected with an electric appliance RL, and the grounding detection circuit mainly comprises a resistor voltage dividing circuit, a half-wave rectification filter circuit and a triode Q;
when the ammeter works normally, the relay K is switched on, the impedance of the resistor voltage dividing circuit of the grounding detection circuit is larger than the impedance of the relay K, and the grounding detection circuit fails; when the electricity stealing behavior of the zero line grounding exists outside, the electricity meter detects that the live line and the zero line current are unbalanced, the switch-off is carried out on the relay K in the electricity meter, when the electricity stealing behavior of the zero line grounding exists outside, namely the electricity consumption of the grounding of the zero line of the electricity meter is carried out, the grounding detection circuit is conducted, the triode Q is conducted, the output end of the grounding detection circuit is low level, the switch-off state of the relay K in the electricity meter is maintained after the electricity meter MCU judges, when the zero line of the electricity meter is disconnected with the ground, namely after the external grounding signal is removed, the grounding detection circuit is opened, the triode Q is cut off, the output end of the grounding detection circuit is high level, the electricity meter MCU judges that the electricity stealing behavior is removed, and the relay K in the electricity meter carries out switching-on operation.
Preferably, the specific circuit connection of the ground detection circuit is as follows: the voltage dividing resistor R1 and the voltage dividing resistor R2 are connected between the live wire input end and the live wire output end, the half-wave rectification filter circuit comprises a diode D1 and a capacitor C1, the half-wave rectification filter circuit is connected to two ends of the resistor R2 in parallel, the base electrode of the triode Q is connected between the diode D1 and the capacitor C1 through a resistor R3, the collector electrode of the triode Q is connected with the DC power supply VDD inside the ammeter through a resistor R4, the collector electrode of the triode Q is the output end of the grounding detection circuit.
When the electricity stealing behavior of the zero line grounding exists outside, the ammeter can detect unbalance of the live line current and the zero line current, and accordingly the ammeter is opened through the relay K inside the ammeter. When the external grounding signal is removed, the grounding detection circuit is opened, the triode Q is cut off, the output end of the grounding detection circuit is high level, the ammeter MCU judges that the grounding electricity stealing behavior of the zero line is removed, and the ammeter internal relay K performs switching-on operation.
The invention has the beneficial effects that: according to the invention, through the arrangement of the grounding detection circuit, after the relay in the meter is opened, whether the grounding fault exists is detected through the grounding detection circuit, if the grounding fault exists, the opening is maintained, and if the grounding fault exists, the switching-on is performed. The electric power staff is not required to carry out field maintenance, and the manpower is saved.
Drawings
FIG. 1 is a schematic diagram of the overall circuit connection of the present invention.
Fig. 2 is a block diagram of the ground detection circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1 and 2, the method for detecting the grounding after the ammeter is opened comprises a grounding detection circuit 1 arranged in the ammeter 2 and a relay K arranged in the ammeter 2 and used for controlling the on-off of a power supply, wherein two ends of the grounding detection circuit 1 are respectively connected with a live wire input end and a live wire output end of the relay K, as shown in fig. 1. The output end of the grounding detection circuit is connected with the input end of the electric meter MCU, and the electric meter MCU controls the relay K to keep a switching-off state or switch on according to the high and low levels of the output end of the grounding detection circuit.
As shown in fig. 1, the ground detection circuit is connected between the live wire input end and the live wire output end of the relay K, and the live wire output end is connected with the electric appliance RL. The grounding detection circuit mainly comprises a resistor voltage division circuit, a half-wave rectification filter circuit and a triode Q. As shown in fig. 2, the specific circuit connections are as follows: the voltage dividing resistor R1 and the voltage dividing resistor R2 are connected between the live wire input end and the live wire output end, the half-wave rectification filter circuit comprises a diode D1 and a capacitor C1, the half-wave rectification filter circuit is connected in parallel to two ends of the resistor R2, a base electrode of the triode Q is connected between the diode D1 and the capacitor C1 through a resistor R3, a collector electrode of the triode Q is connected with an ammeter internal direct current power supply VDD through a resistor R4, a collector electrode of the triode Q is also connected with the live wire input end through the capacitor C2 and serves as an internal reference ground, and the collector electrode of the triode Q is the output end of the grounding detection circuit and is connected with an ammeter MCU.
When the electric meter works normally, the two ends of the electric appliance RL are connected between the live wire and the zero wire of the electric meter 2, and the electric meter does not steal electricity in a grounding way, namely the switch K1 is opened, the relay K is closed, and the electric meter works normally. Since the impedance of the resistor divider circuit of the ground detection circuit 1 is far greater than the impedance of the relay K, the ground detection circuit is equivalent to being shorted and thus disabled. When the electricity stealing behavior of the zero line grounding exists outside the ammeter 2, the ammeter detects that the live line current and the zero line current are unbalanced, the relay K in the ammeter is opened, namely the relay K is disconnected, and the relay K is controlled to be opened after the electricity stealing detection circuit in the ammeter detects the electricity stealing behavior. When the external zero line is grounded, namely the zero line of the electric appliance is grounded to the earth to use electricity, and the electric meter is not connected, as shown by K1 in FIG. 1, the external electric appliance RL is connected with the earth, the whole circuit of the grounding detection circuit 1 is communicated to work, the triode Q is conducted, the output end of the grounding detection circuit is in a low level, and the electric meter MCU maintains the switching-off state of the relay K in the electric meter after receiving the judgment. When the external grounding signal is removed, namely the zero line of the external electric appliance is disconnected from the ground, as shown in fig. 1, the grounding detection circuit is opened, the triode Q is cut off, the output end of the grounding detection circuit is at a high level, the ammeter MCU judges that the grounding electricity stealing behavior of the zero line is removed, and the ammeter internal relay K performs switching-on operation.
According to the invention, through the arrangement of the grounding detection circuit, after the relay in the meter is opened, whether the grounding fault exists is detected through the grounding detection circuit, if the grounding fault exists, the opening is maintained, and if the grounding fault exists, the switching-on is performed. The electric power staff is not required to carry out field maintenance, and the manpower is saved.
Claims (2)
1. A grounding detection method after ammeter brake-out is characterized in that: the electric meter comprises a grounding detection circuit arranged in an electric meter and a relay K for controlling the on-off of a power supply in the electric meter, wherein two ends of the grounding detection circuit are respectively connected with a live wire input end and a live wire output end of the relay K, an output end of the grounding detection circuit is connected with an input end of an electric meter MCU, and the electric meter MCU controls the relay K to keep a switching-off state or switch on according to the high and low levels of the output end of the grounding detection circuit;
the live wire output end of the ammeter is connected with an electric appliance RL, and the grounding detection circuit mainly comprises a resistor voltage dividing circuit, a half-wave rectification filter circuit and a triode Q;
when the ammeter works normally, the relay K is switched on, the impedance of the resistor voltage dividing circuit of the grounding detection circuit is larger than the impedance of the relay K, and the grounding detection circuit fails; when the electricity stealing behavior of the zero line grounding exists outside, the electricity meter detects that the live line and the zero line current are unbalanced, the switch-off is carried out on the relay K in the electricity meter, when the electricity stealing behavior of the zero line grounding exists outside, namely the electricity consumption of the grounding of the zero line of the electricity meter is carried out, the grounding detection circuit is conducted, the triode Q is conducted, the output end of the grounding detection circuit is low level, the switch-off state of the relay K in the electricity meter is maintained after the electricity meter MCU judges, when the zero line of the electricity meter is disconnected with the ground, namely after the external grounding signal is removed, the grounding detection circuit is opened, the triode Q is cut off, the output end of the grounding detection circuit is high level, the electricity meter MCU judges that the electricity stealing behavior is removed, and the relay K in the electricity meter carries out switching-on operation.
2. The method for detecting the grounding of the electric meter after switching off according to claim 1, wherein the method comprises the following steps: the specific circuit connection of the grounding detection circuit is as follows: the voltage dividing resistor R1 and the voltage dividing resistor R2 are connected between the live wire input end and the live wire output end, the half-wave rectification filter circuit comprises a diode D1 and a capacitor C1, the half-wave rectification filter circuit is connected to two ends of the resistor R2 in parallel, the base electrode of the triode Q is connected between the diode D1 and the capacitor C1 through a resistor R3, the collector electrode of the triode Q is connected with the DC power supply VDD inside the ammeter through a resistor R4, the collector electrode of the triode Q is the output end of the grounding detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310280635.0A CN116008862A (en) | 2023-03-22 | 2023-03-22 | Grounding detection method for ammeter after switching off |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310280635.0A CN116008862A (en) | 2023-03-22 | 2023-03-22 | Grounding detection method for ammeter after switching off |
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| CN116008862A true CN116008862A (en) | 2023-04-25 |
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| CN202310280635.0A Pending CN116008862A (en) | 2023-03-22 | 2023-03-22 | Grounding detection method for ammeter after switching off |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946088A (en) * | 2012-10-26 | 2013-02-27 | 华立仪表集团股份有限公司 | Switch-on/off control circuit for electric meter relay and intelligent electric meter |
| CN204144901U (en) * | 2014-06-14 | 2015-02-04 | 天津中电华利电器科技集团有限公司 | A kind of automatic reclosing power protector with anti-stealing electricity function |
| CN204462252U (en) * | 2015-04-07 | 2015-07-08 | 浙江正泰仪器仪表有限责任公司 | A kind of intelligent electric meter control circuit |
| CN105424997A (en) * | 2015-10-23 | 2016-03-23 | 江苏林洋能源股份有限公司 | Relay with state detection circuit and anti-electricity-theft method |
| CN209266313U (en) * | 2018-12-29 | 2019-08-16 | 宁波三星智能电气有限公司 | A kind of control circuit that control relay closes a floodgate |
| CN112290519A (en) * | 2020-11-12 | 2021-01-29 | 佛山市顺德区澳骏电子科技有限公司 | High-reliability ground wire live detection protection circuit |
| CN113848360A (en) * | 2021-08-09 | 2021-12-28 | 江苏林洋能源股份有限公司 | Load high resistance and bypass electricity stealing detection circuit and detection method for three-phase meter |
| CN113960341A (en) * | 2021-10-27 | 2022-01-21 | 成都长城开发科技有限公司 | Ammeter and zero line detection circuitry falls thereof |
| CN114217125A (en) * | 2021-11-30 | 2022-03-22 | 宁波三星智能电气有限公司 | Intelligent ammeter capable of preventing electricity theft, electricity theft prevention system and electricity theft prevention detection method thereof |
-
2023
- 2023-03-22 CN CN202310280635.0A patent/CN116008862A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946088A (en) * | 2012-10-26 | 2013-02-27 | 华立仪表集团股份有限公司 | Switch-on/off control circuit for electric meter relay and intelligent electric meter |
| CN204144901U (en) * | 2014-06-14 | 2015-02-04 | 天津中电华利电器科技集团有限公司 | A kind of automatic reclosing power protector with anti-stealing electricity function |
| CN204462252U (en) * | 2015-04-07 | 2015-07-08 | 浙江正泰仪器仪表有限责任公司 | A kind of intelligent electric meter control circuit |
| CN105424997A (en) * | 2015-10-23 | 2016-03-23 | 江苏林洋能源股份有限公司 | Relay with state detection circuit and anti-electricity-theft method |
| CN209266313U (en) * | 2018-12-29 | 2019-08-16 | 宁波三星智能电气有限公司 | A kind of control circuit that control relay closes a floodgate |
| CN112290519A (en) * | 2020-11-12 | 2021-01-29 | 佛山市顺德区澳骏电子科技有限公司 | High-reliability ground wire live detection protection circuit |
| CN113848360A (en) * | 2021-08-09 | 2021-12-28 | 江苏林洋能源股份有限公司 | Load high resistance and bypass electricity stealing detection circuit and detection method for three-phase meter |
| CN113960341A (en) * | 2021-10-27 | 2022-01-21 | 成都长城开发科技有限公司 | Ammeter and zero line detection circuitry falls thereof |
| CN114217125A (en) * | 2021-11-30 | 2022-03-22 | 宁波三星智能电气有限公司 | Intelligent ammeter capable of preventing electricity theft, electricity theft prevention system and electricity theft prevention detection method thereof |
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Application publication date: 20230425 |