CN112003236B - Overvoltage and overcurrent protection system for electric energy meter - Google Patents
Overvoltage and overcurrent protection system for electric energy meter Download PDFInfo
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- CN112003236B CN112003236B CN202010885747.5A CN202010885747A CN112003236B CN 112003236 B CN112003236 B CN 112003236B CN 202010885747 A CN202010885747 A CN 202010885747A CN 112003236 B CN112003236 B CN 112003236B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
The invention discloses an electric energy meter overvoltage and overcurrent protection system, which comprises: the circuit breaker comprises a current divider, a voltage acquisition module, a first preprocessing module, a current acquisition module, a signal conversion module, a second preprocessing module, a first judgment module, a second judgment module and a circuit breaking protection module; the first judgment module compares the first comparison voltage with a preset first voltage value, and sends a first open-circuit signal to the open-circuit protection module when the first comparison voltage is greater than the first voltage value; the second judgment module compares the second comparison voltage with a preset second voltage value, and sends a second open circuit signal to the open circuit protection module when the second comparison voltage is greater than the second voltage value; and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the first open circuit signal or the second open circuit signal. The overvoltage and overcurrent protection system for the electric energy meter monitors the working voltage and the working current of the electric energy meter, and cuts off a power supply line for supplying power to the outside when one of the working voltage and the working current exceeds a threshold value, so that the electricity utilization safety is ensured.
Description
Technical Field
The invention relates to an electric energy meter overvoltage and overcurrent protection system.
Background
An energy meter is an instrument for measuring electric energy, and is also called a watt-hour meter. At present, overvoltage and overcurrent in an electric energy meter used in China only have the functions of event recording and event alarming, electricity on a user side cannot be disconnected after an event or alarm is generated, and the safety electricity utilization protection effect is not achieved.
Disclosure of Invention
The invention provides an electric energy meter overvoltage and overcurrent protection system, which adopts the following technical scheme:
an electric energy meter overvoltage and overcurrent protection system, comprising: the device comprises a current divider, a voltage acquisition module, a first preprocessing module, a current acquisition module, a signal conversion module, a second preprocessing module, a first judgment module, a second judgment module and a circuit breaking protection module;
the voltage acquisition module is used for acquiring a voltage signal of the current divider;
the first preprocessing module preprocesses the voltage signal acquired by the voltage acquisition module to obtain a first comparison voltage;
the current acquisition module is used for acquiring a current signal of the current divider;
the signal conversion module is used for converting the current signal acquired by the current acquisition module into a voltage signal;
the second preprocessing module is used for preprocessing the voltage signal converted by the signal conversion module to obtain a second comparison voltage;
the first judgment module is used for comparing the first comparison voltage with a preset first voltage value and sending a first open circuit signal to the open circuit protection module when the first comparison voltage is greater than the first voltage value;
the second judgment module is used for comparing the second comparison voltage with a preset second voltage value and sending a second open circuit signal to the open circuit protection module when the second comparison voltage is greater than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the first open circuit signal or the second open circuit signal.
Further, the electric energy meter overvoltage and overcurrent protection system further comprises: the single chip microcomputer module and the display module;
when the first comparison voltage is larger than the first voltage value, the first judgment module also sends a first display control signal to the single chip microcomputer module, the single chip microcomputer module sends the first display signal to the display module after receiving the first display control signal, and the display module displays the voltage overload protection information;
when the second comparison voltage is larger than the second voltage value, the second judgment module further sends a second display control signal to the single chip microcomputer module, the single chip microcomputer module receives the second display control signal and then sends the second display signal to the display module, and the display module displays the current overload protection information.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a control module for user operation;
the control module is used for receiving the operation of a user and sending a power-on control signal to the singlechip module;
the single chip module sends a power-on signal to the open circuit protection module and sends a clearing signal to the display module after receiving the power-on control signal;
the circuit breaking protection module recovers a power supply circuit supplying power to the outside after receiving the power-on signal;
and the display module stops displaying the voltage overload protection information or the current overload protection information after receiving the clearing signal.
Further, the first judging module is a first comparator;
the second judging module is a second comparator;
the first preprocessing module sends the preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is larger than a first voltage value, the first comparator outputs a high-frequency signal to the open-circuit protection module;
the second preprocessing module sends the preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is larger than a second voltage value, the second comparator outputs a high-frequency signal to the circuit breaking protection module.
Further, the disconnection protection module comprises a pulse generator and a relay;
when the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off;
when the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a third judgment module and a fourth judgment module;
the third judging module is used for judging whether the first comparison voltage is between a preset third voltage value and the first voltage value or not and sending a third open circuit signal to the open circuit protection module when the time that the first comparison voltage is continuously between the third voltage value and the first voltage value reaches a first preset time, wherein the third voltage value is smaller than the first voltage value;
the fourth judging module is used for judging whether the second comparison voltage is between a preset fourth voltage value and the second voltage value or not and sending a fourth open circuit signal to the open circuit protection module when the time that the second comparison voltage is continuously between the fourth voltage value and the second voltage value reaches the first preset time;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a third judgment module and a fourth judgment module;
the third judging module is used for judging whether the first comparison voltage is between a preset third voltage value and the first voltage value, and in a second preset time, when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, the third judging module sends a third open circuit signal to the open circuit protection module, wherein the third voltage value is smaller than the first voltage value, and the second preset time is longer than the first preset time;
the fourth judging module is used for judging whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and in a second preset time, when the time accumulation of the second comparison voltage between the fourth voltage value and the second voltage value reaches a first preset time, the fourth judging module sends a fourth open circuit signal to the open circuit protection module, and the fourth voltage value is smaller than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
Further, the first preset time is half of the second preset time.
Further, the first preprocessing module comprises a first signal amplifying submodule and a first shaping submodule;
the second preprocessing module comprises a second signal amplifying submodule and a second shaping submodule;
the first signal amplification submodule is used for amplifying the voltage signal acquired by the voltage acquisition module;
the first shaping submodule is used for shaping the voltage signal amplified by the first signal amplification submodule to obtain a first comparison voltage;
the second signal amplification submodule is used for amplifying the voltage signal converted by the signal conversion module;
the second shaping submodule is used for shaping the voltage signal amplified by the second signal amplification submodule to obtain a second comparison voltage.
Further, the shunt is a manganin shunt.
The overvoltage and overcurrent protection system has the advantages that the overvoltage and overcurrent protection system for the electric energy meter monitors the working voltage and the working current of the electric energy meter, and cuts off a power supply line supplying power to the outside when one of the working voltage and the working current exceeds a threshold value, so that the power utilization safety is ensured.
The overvoltage and overcurrent protection system for the electric energy meter has the advantages that when the working current or the working voltage of the electric energy meter is in a preset higher range for a long time, the system can also cut off a power supply line supplying power to the outside. Further ensuring the safety of power utilization.
Drawings
FIG. 1 is a schematic diagram of an electric energy meter over-voltage and over-current protection system of the present invention;
FIG. 2 is a schematic diagram of a first pre-processing module of the present invention;
FIG. 3 is a schematic diagram of a second pre-processing module of the present invention.
The protection system comprises an electric energy meter overvoltage and overcurrent protection system 100, a shunt 101, a voltage acquisition module 102, a first preprocessing module 103, a first signal amplification sub-module 1031, a first shaping sub-module 1032, a current acquisition module 104, a signal conversion module 105, a second preprocessing module 106, a second signal amplification sub-module 1061, a second shaping sub-module 1062, a first judgment module 107, a second judgment module 108, an open circuit protection module 109, a single chip microcomputer module 110, a display module 111, a control module 112, a third judgment module 113 and a fourth judgment module 114.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Fig. 1 shows an overvoltage and overcurrent protection system 100 for an electric energy meter according to the present invention, which mainly includes: the circuit breaker comprises a current divider 101, a voltage acquisition module 102, a first preprocessing module 103, a current acquisition module 104, a signal conversion module 105, a second preprocessing module 106, a first judgment module 107, a second judgment module 108 and a circuit breaking protection module 109. The shunt 101 is used for shunting and sampling a live wire connected to the electric energy meter, and in the invention, the shunt 101 adopts a manganese-copper shunt. The voltage collecting module 102 is used for collecting a voltage signal of the current divider 101. The first preprocessing module 103 preprocesses the voltage signal acquired by the voltage acquisition module 102 to obtain a first comparison voltage. The current collecting module 104 is used for collecting the current signal of the current divider 101. The signal conversion module 105 is configured to convert the current signal collected by the current collection module 104 into a voltage signal. The second preprocessing module 106 is configured to preprocess the voltage signal converted by the signal conversion module 105 to obtain a second comparison voltage. The first determining module 107 is configured to compare the first comparison voltage with a preset first voltage value, and send a first open-circuit signal to the open-circuit protection module 109 when the first comparison voltage is greater than the first voltage value. The second determining module 108 is configured to compare the second comparison voltage with a preset second voltage value, and send a second open circuit signal to the open circuit protection module 109 when the second comparison voltage is greater than the second voltage value. The specific values of the first voltage value and the second voltage value can be set according to requirements. The disconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the first disconnection signal or the second disconnection signal as needed. Through the over-voltage and over-current protection system 100 for the electric energy meter, when the current or the voltage of the electric energy meter is overlarge, the electric energy meter can automatically cut off a power supply circuit supplying power to the outside, so that potential safety hazards are reduced.
As a preferred embodiment, as shown in fig. 2 and 3, the first pre-processing module 103 includes a first signal amplifying sub-module and a first shaping sub-module 1032 block. The second pre-processing module 106 includes a second signal amplification sub-module 1061 and a second shaping sub-module 1062.
Specifically, the first signal amplification sub-module is configured to amplify the voltage signal acquired by the voltage acquisition module 102. The first shaping submodule 1032 is configured to shape the voltage signal amplified by the first signal amplification submodule to obtain a first comparison voltage. The second signal amplifying sub-module 1061 is configured to amplify the voltage signal converted by the signal converting module 105. The second shaping submodule 1062 is configured to shape the voltage signal amplified by the second signal amplifying submodule 1061 to obtain a second comparison voltage.
As a preferred embodiment, the electric energy meter overvoltage and overcurrent protection system 100 further includes: a singlechip module 110 and a display module 111.
Specifically, when the first comparison voltage is greater than the first voltage value, the first determining module 107 further sends a first display control signal to the single chip microcomputer module 110, the single chip microcomputer module 110 sends the first display signal to the display module 111 after receiving the first display control signal, and the display module 111 displays the voltage overload protection information, specifically, displays "U-over". When the second comparison voltage is greater than the second voltage value, the second judgment module 108 further sends a second display control signal to the single chip microcomputer module 110, the single chip microcomputer module 110 sends the second display signal to the display module 111 after receiving the second display control signal, and the display module 111 displays the current overload protection information, specifically, displays "I-over". It will be appreciated that the information displayed may be adjusted as desired.
In a preferred embodiment, the electric energy meter overvoltage and overcurrent protection system 100 further comprises a control module 112 for user operation.
In the case that the open-circuit protection module 109 cuts off power supply, when the user eliminates the risk, the control module 112 may be operated to send a power-on control signal to the single chip module 110. The single chip module 110 receives the power-on control signal, and then sends a power-on signal to the open circuit protection module 109 and a clear signal to the display module 111. The open circuit protection module 109 receives the power-on signal and then recovers the power supply line supplying power to the outside. The display module 111 stops displaying the voltage overload protection information or the current overload protection information after receiving the clear signal.
As an alternative implementation, the first determining module 107 is a first comparator. The second determining module 108 is a second comparator.
Specifically, the first preprocessing module 103 sends the preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is greater than the first voltage value, the first comparator outputs a high-frequency signal to the open-circuit protection module 109. The second preprocessing module 106 sends the preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is greater than the second voltage value, the second comparator outputs a high-frequency signal to the open-circuit protection module 109.
As an alternative embodiment, the disconnection protection module 109 comprises a pulse generator and a relay.
When the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off. When the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off.
In a preferred embodiment, the electric energy meter overvoltage and overcurrent protection system 100 further includes a third determination module 113 and a fourth determination module 114.
It will be appreciated that in some cases, the first comparison voltage does not exceed the predetermined first voltage value at all times, but there may be a safety hazard when operating for a long time in a high voltage region close to the first voltage value. Therefore, preferably, in the present invention, the third determining module 113 is configured to determine whether the first comparison voltage is between a preset third voltage value and the first voltage value, and send a third open signal to the open-circuit protection module 109 when a time that the first comparison voltage is continuously between the third voltage value and the first voltage value reaches a first preset time, where the third voltage value is smaller than the first voltage value. Similarly, the fourth determining module 114 is configured to determine whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and send a fourth open signal to the open-circuit protection module 109 when the time that the second comparison voltage is continuously between the fourth voltage value and the second voltage value reaches the first preset time. The disconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the third disconnection signal or the fourth disconnection signal.
As another alternative embodiment, the electric energy meter overvoltage and overcurrent protection system 100 also includes a third determination module 113 and a fourth determination module 114. The third and fourth judging modules 113 and 114 are different from the judging logic of the previous embodiment. Specifically, the third determining module 113 is configured to determine whether the first comparison voltage is between a preset third voltage value and the first voltage value, and in a second preset time, when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, the third determining module 113 sends a third open-circuit signal to the open-circuit protection module 109, where the third voltage value is smaller than the first voltage value. The fourth determining module 114 is configured to determine whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and in a second preset time, when the time accumulation of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time, the fourth determining module 114 sends a fourth open-circuit signal to the open-circuit protection module 109, where the fourth voltage value is smaller than the second voltage value. The disconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the third disconnection signal or the fourth disconnection signal. And the second preset time is longer than the first preset time. In this embodiment, the first comparison voltage does not need to be continuously between the third voltage value and the first voltage value for the first preset time, but the accumulated time of the first comparison voltage between the third voltage value and the first voltage value for the second preset time reaches the first preset time, which is in accordance with the power-off condition. Similarly, in the second preset time, the accumulated time of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time, and the power-off condition is met. Specifically, the first preset time is set to be half of the second preset time.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (4)
1. An electric energy meter overvoltage and overcurrent protection system is characterized by comprising: the circuit breaker comprises a current divider, a voltage acquisition module, a first preprocessing module, a current acquisition module, a signal conversion module, a second preprocessing module, a first judgment module, a second judgment module and a circuit breaking protection module;
the voltage acquisition module is used for acquiring a voltage signal of the current divider;
the first preprocessing module preprocesses the voltage signal acquired by the voltage acquisition module to obtain a first comparison voltage;
the current acquisition module is used for acquiring a current signal of the current divider;
the signal conversion module is used for converting the current signal acquired by the current acquisition module into a voltage signal;
the second preprocessing module is used for preprocessing the voltage signal converted by the signal conversion module to obtain a second comparison voltage;
the first judging module is used for comparing the first comparison voltage with a preset first voltage value and sending a first open circuit signal to the open circuit protection module when the first comparison voltage is greater than the first voltage value;
the second judging module is used for comparing the second comparison voltage with a preset second voltage value and sending a second circuit breaking signal to the circuit breaking protection module when the second comparison voltage is greater than the second voltage value;
the circuit breaking protection module cuts off a power supply circuit supplying power to the outside when receiving the first circuit breaking signal or the second circuit breaking signal;
the electric energy meter overvoltage and overcurrent protection system further comprises: the single chip microcomputer module and the display module;
when the first comparison voltage is larger than the first voltage value, the first judgment module also sends a first display control signal to the single chip microcomputer module, the single chip microcomputer module sends a first display signal to the display module after receiving the first display control signal, and the display module displays voltage overload protection information;
when the second comparison voltage is greater than the second voltage value, the second judgment module further sends a second display control signal to the single-chip microcomputer module, the single-chip microcomputer module receives the second display control signal and then sends a second display signal to the display module, and the display module displays current overload protection information;
the electric energy meter overvoltage and overcurrent protection system also comprises a control module for user operation;
the control module is used for receiving the operation of a user and sending a power-on control signal to the singlechip module;
the single chip microcomputer module receives the power-on control signal and then sends a power-on signal to the circuit breaking protection module and a clearing signal to the display module;
the circuit breaking protection module recovers a power supply circuit supplying power to the outside after receiving the power-on signal;
the display module stops displaying the voltage overload protection information or the current overload protection information after receiving the clearing signal;
the first judging module is a first comparator;
the second judging module is a second comparator;
the first preprocessing module sends a preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is larger than a first voltage value, the first comparator outputs a high-frequency signal to the circuit breaking protection module;
the second preprocessing module sends a preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is larger than a second voltage value, the second comparator outputs a high-frequency signal to the circuit breaking protection module;
the circuit breaking protection module comprises a pulse generator and a relay;
when the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off;
when the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off;
the electric energy meter overvoltage and overcurrent protection system further comprises a third judgment module and a fourth judgment module;
the third judging module is configured to judge whether the first comparison voltage is between a preset third voltage value and the first voltage value, and send a third open-circuit signal to the open-circuit protection module within a second preset time when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, where the third voltage value is smaller than the first voltage value, and the second preset time is longer than the first preset time;
the fourth judging module is configured to judge whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and send a fourth open-circuit signal to the open-circuit protection module when the time of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time within the second preset time, where the fourth voltage value is smaller than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
2. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the first preset time is half of the second preset time.
3. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the first preprocessing module comprises a first signal amplification sub-module and a first shaping sub-module;
the second preprocessing module comprises a second signal amplification sub-module and a second shaping sub-module;
the first signal amplification submodule is used for amplifying the voltage signal acquired by the voltage acquisition module;
the first shaping submodule is used for shaping the voltage signal amplified by the first signal amplification submodule to obtain the first comparison voltage;
the second signal amplification submodule is used for amplifying the voltage signal converted by the signal conversion module;
the second shaping submodule is used for shaping the voltage signal amplified by the second signal amplification submodule to obtain the second comparison voltage.
4. The electric energy meter over-voltage and over-current protection system according to claim 1,
the shunt is a manganese copper shunt.
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| CN202010885747.5A CN112003236B (en) | 2020-08-28 | 2020-08-28 | Overvoltage and overcurrent protection system for electric energy meter |
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| CN202010885747.5A CN112003236B (en) | 2020-08-28 | 2020-08-28 | Overvoltage and overcurrent protection system for electric energy meter |
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| CN112003236B true CN112003236B (en) | 2022-09-23 |
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| CN114498551B (en) * | 2022-04-18 | 2022-07-01 | 青岛鼎信通讯股份有限公司 | Overvoltage protection method, device, equipment and medium for single-phase electric energy meter |
| WO2024077115A1 (en) * | 2022-10-06 | 2024-04-11 | Landis+Gyr Technology, Inc. | Electricity meter with grid-side voltage sensing |
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| CN111490519A (en) * | 2020-03-26 | 2020-08-04 | 上海芯导电子科技股份有限公司 | Overvoltage and overcurrent protection chip |
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| CN102621494A (en) * | 2011-01-25 | 2012-08-01 | 三洋电机株式会社 | Overvoltage detection device, protective device and battery pack |
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