CN114442020A - Leakage protector calibration method - Google Patents
Leakage protector calibration method Download PDFInfo
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- CN114442020A CN114442020A CN202011233135.4A CN202011233135A CN114442020A CN 114442020 A CN114442020 A CN 114442020A CN 202011233135 A CN202011233135 A CN 202011233135A CN 114442020 A CN114442020 A CN 114442020A
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- zero
- leakage
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- live
- chip microcomputer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a method for calibrating a leakage protector, which relates to the technical field of leakage protectors, and comprises the following steps of: firstly, inputting a reference current; dividing the current value of the leakage current detected by the zero live wire mutual inductor by the current value of the input reference current to obtain a zero live wire calibration coefficient; finally, writing the zero live wire calibration coefficient into the leakage protector; compared with the prior art, the zero-live line calibration coefficient and the ground line calibration coefficient are obtained through calibration, and the detected leakage current is multiplied by the corresponding calibration coefficient, so that the detection error caused by component errors is reduced, and the use safety of the leakage protector is improved.
Description
Technical Field
The invention relates to the technical field of leakage protectors, in particular to a method for calibrating a leakage protector.
Background
Electronic components such as a mutual inductor and a load resistor used by the leakage protector for detecting leakage current have errors when leaving a factory, which may cause the leakage current detected by the mutual inductor to be inaccurate and have potential safety hazards.
The leakage protection device with ground wire live protection disclosed in CN3178492A of china includes three poles of phase line L, zero line N and ground line E with switches, zero sequence current transformers passing through the phase line L and the zero line N, test circuits, releases, rectification circuits, power supply step-down and silicon controlled rectifiers, a current detector and a dual input end amplifier, wherein one end of a primary coil of the current detector is connected with the ground line E, the other end of the primary coil of the current detector is connected with the zero line N after being connected in series with a large resistance current limiting step-down circuit, a secondary coil of the current detector is connected with one input end of the dual input end amplifier, two output ends of the dual input end amplifier are respectively connected with trigger electrodes of the two silicon controlled rectifiers, and the output end of the zero sequence current transformer is connected with the other input end of the dual input end amplifier; although the invention can simultaneously detect whether the zero line, the live line and the ground wire are leaked, the leakage currents detected by the mutual inductor have errors.
Disclosure of Invention
First, technical problem to be solved
Aiming at the defects in the prior art, how to reduce the influence of component errors on the leakage protector is provided.
Second, technical scheme
In order to solve the problems, the invention particularly provides a method for calibrating a leakage protector, which comprises the following steps of calibrating a zero-live line mutual inductor:
firstly, inputting a reference current;
dividing the current value of the leakage current detected by the zero live wire mutual inductor by the current value of the input reference current to obtain a zero live wire calibration coefficient;
and finally, writing the zero live wire calibration coefficient into the leakage protector.
The method also comprises the step of calibrating the ground wire transformer:
firstly, inputting a reference current;
dividing the current value of the leakage current detected by the ground line transformer by the current value of the input reference current to obtain a ground line calibration coefficient;
and finally, writing the ground wire calibration coefficient into the leakage protector.
Wherein the method is implemented based on a leakage protector comprising:
the action module is used for switching off or switching on a zero line and a live line of a load;
the single chip microcomputer is used for controlling the action module to switch off or switch on the zero line and the live line of the load;
the zero-live wire mutual inductor is used for detecting whether the live wire and the zero wire leak electricity or not, and when the electricity leakage is detected, the zero-live wire mutual inductor sends out a zero-live wire electricity leakage analog signal;
the ground wire mutual inductor is used for detecting whether the ground wire leaks electricity or not, and when the electricity leakage is detected, the ground wire mutual inductor sends out a ground wire electricity leakage analog signal;
after the single chip microcomputer receives the zero line and live line leakage analog signal or the ground line leakage analog signal, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
The singlechip is also used for converting the analog signal into a digital signal.
The singlechip comprises an analog/digital converter, and the analog/digital converter is used for converting an analog signal into a digital signal.
Wherein, after the singlechip receives the zero-live line electric leakage analog signal:
firstly, converting a zero live wire leakage analog signal into a digital signal by an analog/digital converter;
then the singlechip multiplies the leakage current value detected by the zero-live line mutual inductor by a zero-live line calibration coefficient to obtain a zero-live line leakage current effective value;
and finally, the single chip microcomputer compares the effective zero-live line leakage current value with the preset zero-live line tripping value, and when the effective zero-live line leakage current value is larger than the preset zero-live line tripping value, the single chip microcomputer controls the action module to disconnect the loaded zero line and the loaded live line.
Wherein, after the singlechip receives the ground wire electric leakage analog signal:
firstly, converting a ground wire leakage analog signal into a digital signal by an analog/digital converter;
then, multiplying the leakage current value detected by the ground wire mutual inductor by a ground wire calibration coefficient by the singlechip to obtain a ground wire leakage current effective value;
and finally, the single chip microcomputer compares the effective value of the ground wire leakage current with the preset value of the ground wire tripping, and when the effective value of the ground wire leakage current is larger than the preset value of the ground wire tripping, the single chip microcomputer controls the action module to disconnect the zero line and the live wire of the load.
Thirdly, the invention has the beneficial effects
Compared with the prior art, the zero-live line calibration coefficient and the ground line calibration coefficient are obtained through calibration, and the detected leakage current is multiplied by the corresponding calibration coefficient, so that the detection error caused by component errors is reduced, and the use safety of the leakage protector is improved.
Drawings
FIG. 1 is a diagram of the main module connections of an embodiment of the present invention;
FIG. 2 is a circuit schematic of an action module of an embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a single-chip microcomputer of an embodiment of the present invention;
FIG. 4 is a circuit schematic of a power module of an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of the leakage detection module according to the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, in this embodiment, the model of the single chip microcomputer U2 is JR103, and an analog/digital converter is provided in the single chip microcomputer U2.
As shown in fig. 4, after power is turned on, the power module supplies power to other modules;
as shown in fig. 5, in the present embodiment, the leakage detecting module includes a zero line transformer ZCT2 and a ground line transformer ZCT 1;
the calibration steps are implemented under the condition that the commercial power is disconnected, and the zero live line transformer ZCT2 calibration step is implemented through the following steps:
step 1: enabling 30mA reference current to be conducted on a zero line or a live line through a voltage stabilizing source;
step 2: and dividing the current value of the leakage current detected by the zero live line transformer ZCT2 by the current value of the input reference current to obtain a zero live line calibration coefficient.
In this embodiment, for convenience of description, it is assumed that the current value of the leakage current detected by the zero-live line transformer ZCT2 is 27mA, that is, the zero-live line calibration coefficient is 0.9.
And step 3: and programming the zero-live line calibration coefficient into the singlechip U2.
Under the condition of normal operation, when the zero-live line transformer ZCT2 detects electric leakage, the zero-live line transformer ZCT2 sends out a zero-live line electric leakage analog signal;
for convenience of explanation, it is assumed that the zero line leakage current is 50mA and the zero line tripping preset value is 40 mA;
after the singlechip U2 receives the zero-live line electric leakage analog signal:
firstly, converting a zero live wire leakage analog signal into a digital signal by the analog/digital converter;
then, the single chip microcomputer U2 multiplies the leakage current value detected by the zero-live line mutual inductor ZCT2 by a zero-live line calibration coefficient to obtain a zero-live line leakage current effective value;
namely, multiplying 50mA by 0.9, and obtaining the zero live wire leakage effective value of 45 mA.
And finally, the single chip microcomputer U2 compares the effective value of the leakage current of the zero line and the live line with the preset value of the zero line and the live line tripping, and when the effective value of the leakage current of the zero line and the live line is greater than the preset value of the zero line and the live line tripping, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
The calibration step of the ground line transformer ZCT1 is implemented by the following steps:
step 1: enabling a reference current of 30mA to be conducted on a ground wire strip through a voltage stabilizing source;
step 2: dividing the current value of the leakage current detected by the ground line transformer ZCT1 by the current value of the input reference current to obtain a ground line calibration coefficient;
and 3, step 3: and programming the ground wire calibration coefficient into the singlechip U2.
Under the condition of normal work, when the ground wire mutual inductor ZCT1 detects the electric leakage, the ground wire mutual inductor ZCT1 sends out a ground wire electric leakage analog signal;
after the singlechip U2 receives the ground wire leakage analog signal:
firstly, converting a ground wire leakage analog signal into a digital signal by the analog/digital converter;
then, the single chip microcomputer U2 multiplies the leakage current value detected by the ground wire mutual inductor ZCT1 by a ground wire calibration coefficient to obtain a ground wire leakage current effective value;
and finally, the single chip microcomputer U2 compares the effective value of the ground wire leakage current with the preset value of the ground wire tripping, and when the effective value of the ground wire leakage current is greater than the preset value of the ground wire tripping, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
The zero live wire calibration coefficient and the ground wire calibration coefficient are obtained through calibration, and the detected leakage current is multiplied by the corresponding calibration coefficient, so that the detection error caused by component errors is reduced, and the use safety of the leakage protector is improved.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (7)
1. A method for calibrating a leakage protector is characterized by comprising the following steps of:
firstly, inputting a reference current;
dividing the current value of the leakage current detected by the zero live wire mutual inductor by the current value of the input reference current to obtain a zero live wire calibration coefficient;
and finally, writing the zero live wire calibration coefficient into the leakage protector.
2. A method for calibrating a leakage protector, according to claim 1, further comprising the step of calibrating the ground transformer by:
firstly, inputting a reference current;
dividing the current value of the leakage current detected by the ground line transformer by the current value of the input reference current to obtain a ground line calibration coefficient;
and finally, writing the ground wire calibration coefficient into the leakage protector.
3. A method for calibrating a leakage protector as claimed in claim 2, wherein the method is implemented based on a leakage protector comprising:
the action module is used for switching off or switching on a zero line and a live line of a load;
the single chip microcomputer is used for controlling the action module to switch off or switch on a zero line and a live line of a load;
the zero-live wire mutual inductor is used for detecting whether live wires and zero wires leak electricity or not, and when the electricity leakage is detected, the zero-live wire mutual inductor sends out a zero-live wire electricity leakage analog signal;
the ground wire mutual inductor is used for detecting whether the ground wire leaks electricity or not, and when the electricity leakage is detected, the ground wire mutual inductor sends out a ground wire electricity leakage analog signal;
and after the single chip microcomputer receives the zero line and live line electric leakage analog signal or the ground line electric leakage analog signal, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
4. A method for calibrating a leakage protector as claimed in claim 3, wherein said single-chip microcomputer is further adapted to convert the analog signal to a digital signal.
5. A method for calibrating a leakage protector as claimed in claim 4, wherein the single-chip microcomputer comprises an analog/digital converter for converting an analog signal into a digital signal.
6. The method for calibrating a leakage protector as claimed in claim 5, wherein after the single chip microcomputer receives the zero-live line leakage analog signal:
firstly, converting a zero live wire leakage analog signal into a digital signal by the analog/digital converter;
then the single chip microcomputer multiplies the leakage current value detected by the zero-live line mutual inductor by a zero-live line calibration coefficient to obtain a zero-live line leakage current effective value;
and finally, the single chip microcomputer compares the effective zero-live line leakage current value with the preset zero-live line tripping value, and when the effective zero-live line leakage current value is larger than the preset zero-live line tripping value, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
7. A leakage protector calibration method as claimed in claim 5, wherein after the single chip microcomputer receives the ground leakage analog signal:
firstly, converting a ground wire leakage analog signal into a digital signal by the analog/digital converter;
then the single chip microcomputer multiplies the leakage current value detected by the ground wire mutual inductor by a ground wire calibration coefficient to obtain a ground wire leakage current effective value;
and finally, the single chip microcomputer compares the effective value of the ground wire leakage current with a preset value of the ground wire tripping, and when the effective value of the ground wire leakage current is greater than the preset value of the ground wire tripping, the single chip microcomputer controls the action module to disconnect the zero line and the live line of the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011233135.4A CN114442020A (en) | 2020-11-06 | 2020-11-06 | Leakage protector calibration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011233135.4A CN114442020A (en) | 2020-11-06 | 2020-11-06 | Leakage protector calibration method |
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| Publication Number | Publication Date |
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| CN114442020A true CN114442020A (en) | 2022-05-06 |
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| CN202011233135.4A Pending CN114442020A (en) | 2020-11-06 | 2020-11-06 | Leakage protector calibration method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932385A (en) * | 2022-12-12 | 2023-04-07 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
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- 2020-11-06 CN CN202011233135.4A patent/CN114442020A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115932385A (en) * | 2022-12-12 | 2023-04-07 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
| CN115932385B (en) * | 2022-12-12 | 2023-11-17 | 怀化建南机器厂有限公司 | Residual current monitoring method and system and single-phase intelligent electric energy meter |
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