CN210577737U - Residual current protection device and system - Google Patents
Residual current protection device and system Download PDFInfo
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- CN210577737U CN210577737U CN201921589567.1U CN201921589567U CN210577737U CN 210577737 U CN210577737 U CN 210577737U CN 201921589567 U CN201921589567 U CN 201921589567U CN 210577737 U CN210577737 U CN 210577737U
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Abstract
The utility model provides a residual current protection device and system, the device includes: the residual current transformer is connected with the analog-to-digital converter; the current measuring module, the voltage measuring module, the analog-to-digital converter, the relay module and the communication module are connected with the controller; the controller is used for determining the current value of the residual current according to the digital signal related to the residual current, triggering the electrical module to perform trip protection on the protected circuit when the current value of the residual current exceeds a threshold value, sending the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage to external equipment through the communication module, sending an electric leakage risk early warning signal when receiving an electric leakage risk early warning instruction sent by the external equipment, and setting the threshold value as an adjusted threshold value when receiving an adjusted threshold value sent by the external equipment; the utility model provides a residual current protection device and system can carry out real time monitoring to being protected circuit.
Description
Technical Field
The utility model relates to the field of electronic technology, in particular to residual current protection device and system.
Background
The installation of a residual current protection device in a low-voltage power grid is an effective protection measure for preventing personal electric shock, electric fire and damage of electrical equipment.
In the existing residual current protection device, when the residual current of the protected circuit exceeds a preset threshold value, the residual current protection device performs trip protection.
The existing residual current protection device can only react when the protected circuit has a fault exceeding a threshold value, and cannot monitor the protected circuit in real time.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a residual current protection device and system can carry out real time monitoring to being protected circuit.
In a first aspect, an embodiment of the present invention provides a residual current protection device, including:
the device comprises a residual current transformer, a current measuring module, a voltage measuring module, an analog-to-digital converter, a relay module, a communication module and a controller;
the residual current transformer is connected with the analog-to-digital converter;
the current measuring module, the voltage measuring module, the analog-to-digital converter, the relay module and the communication module are all connected with the controller;
the residual current transformer is used for sensing the residual current of the protected circuit, obtaining an analog signal related to the residual current and sending the analog signal related to the residual current to the analog-to-digital converter;
the analog-to-digital converter is used for converting an analog signal related to the residual current into a digital signal related to the residual current and sending the digital signal related to the residual current to the controller;
the current measuring module is used for measuring the current value of the branch current of the protected circuit and sending the current value of the branch current to the controller;
the voltage measuring module is used for measuring the voltage value of the phase line voltage of the protected circuit and sending the voltage value of the phase line voltage to the controller;
the controller is used for determining the current value of the residual current according to the digital signal related to the residual current, triggering the relay module to perform trip protection on the protected circuit when the current value of the residual current exceeds a threshold value, sending the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage to external equipment through the communication module, sending an electric leakage risk early warning signal when receiving an electric leakage risk early warning instruction sent by the external equipment, and setting the threshold value as the adjusted threshold value when receiving the adjusted threshold value sent by the external equipment;
the electric leakage risk early warning instruction is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage;
and the adjusted threshold value is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage.
Alternatively,
the residual current protection device further comprises: a signal processor;
the residual current transformer is connected with the signal processor;
the signal processor is connected with the analog-to-digital converter;
and the signal processor is used for filtering the analog signal related to the residual current and sending the filtered analog signal related to the residual current to the analog-to-digital converter.
Alternatively,
the communication module includes: any one or more of a wireless module, an infrared communication port, a serial port and a power line communication port.
Alternatively,
the residual current protection device further comprises: a power supply module;
the power supply module is connected with the controller;
and the power supply module is used for supplying power to the controller.
Alternatively,
the signal processor includes: a first order low pass filter and a second order low pass filter;
the residual current transformer is connected with the input end of the first-order low-pass filter;
the output end of the first-order low-pass filter is connected with the input end of the second-order low-pass filter;
and the output end of the second-order low-pass filter is connected with the analog-to-digital converter.
Alternatively,
the residual current transformer comprises: a secondary coil and a magnetic core;
the secondary coil is wound on the magnetic core;
the magnetic core is sleeved on the protected circuit;
the secondary coil is connected with the analog-to-digital converter.
Alternatively,
the residual current protection device further comprises: the circuit comprises an operational amplifier, a first resistor, a second resistor and a third resistor;
the output end of the operational amplifier is respectively connected with the first end of the secondary coil, the first end of the first resistor and the analog-to-digital converter;
the non-inverting input end of the operational amplifier is respectively connected with the second end of the first resistor and the first end of the second resistor;
the inverting input end of the operational amplifier is respectively connected with the first end of the third resistor and the second end of the secondary coil;
the second end of the second resistor is grounded, and the second end of the third resistor is grounded.
In a second aspect, an embodiment of the present invention provides a residual current protection system, including:
a concentrator and at least one residual current protection device of any one of the first aspects;
the concentrator is connected with external equipment;
the communication module of each residual current protection device is connected with the concentrator;
the concentrator is used for sending the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage sent by each communication module to the external equipment.
Alternatively,
the concentrator is connected to the external device through a general packet radio service technology-based network.
In the embodiment of the utility model, the residual current transformer, the current measuring module and the voltage measuring module are respectively arranged for the protected circuit, the residual current of the protected circuit is sensed by the residual current transformer, the branch current and the phase line voltage of the protected circuit are respectively measured by the current measuring module and the voltage measuring module, the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage are sent to the external equipment by the controller through the communication module, thus, the external equipment can check the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage of the protected circuit, and can generate the electric leakage risk early warning instruction and adjust the threshold value according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage, the controller sends the electric leakage risk early warning signal when receiving the electric leakage risk early warning instruction, and when the controller receives the adjusted threshold, the controller sets the threshold as the adjusted threshold, so that the real-time monitoring of the protected circuit is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a residual current protection device according to an embodiment of the present invention;
fig. 2 is a schematic view of another residual current protection device according to an embodiment of the present invention;
fig. 3 is a schematic view of another residual current protection device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a residual current transformer according to an embodiment of the present invention;
fig. 5 is a partial circuit diagram of a residual current protection device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a residual current protection system according to an embodiment of the present invention.
Description of the reference numerals
1 residual current transformer 2 current measuring module 3 voltage measuring module
4 analog-to-digital converter 5 relay module 6 communication module 7 controller
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a residual current protection device, including:
the device comprises a residual current transformer 1, a current measuring module 2, a voltage measuring module 3, an analog-to-digital converter 4, a relay module 5, a communication module 6 and a controller 7;
the residual current transformer 1 is connected with the analog-to-digital converter 4;
the current measuring module 2, the voltage measuring module 3, the analog-to-digital converter 4, the relay module 5 and the communication module 6 are all connected with the controller 7;
the residual current transformer 1 is used for sensing residual current of a protected circuit, obtaining an analog signal related to the residual current, and sending the analog signal related to the residual current to the analog-to-digital converter 4;
the analog-to-digital converter 4 is configured to convert an analog signal related to the residual current into a digital signal related to the residual current, and send the digital signal related to the residual current to the controller 7;
the current measuring module 2 is configured to measure a current value of a branch current of the protected circuit, and send the current value of the branch current to the controller 7;
the voltage measuring module 3 is configured to measure a voltage value of a phase line voltage of the protected circuit, and send the voltage value of the phase line voltage to the controller 7;
the controller 7 is configured to determine a current value of the residual current according to a digital signal related to the residual current, trigger the relay module 5 to perform trip protection on the protected circuit when the current value of the residual current exceeds a threshold value, send the current value of the residual current, the current value of the branch current, and the voltage value of the phase line voltage to an external device through the communication module 6, send an electric leakage risk early warning signal when an electric leakage risk early warning instruction sent by the external device is received, and set the threshold value as an adjusted threshold value when the adjusted threshold value sent by the external device is received;
the electric leakage risk early warning instruction is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage;
and the adjusted threshold value is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage.
In the embodiment of the utility model, the residual current transformer, the current measuring module and the voltage measuring module are respectively arranged for the protected circuit, the residual current of the protected circuit is sensed by the residual current transformer, the branch current and the phase line voltage of the protected circuit are respectively measured by the current measuring module and the voltage measuring module, the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage are sent to the external equipment by the controller through the communication module, thus, the external equipment can check the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage of the protected circuit, and can generate the electric leakage risk early warning instruction and adjust the threshold value according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage, the controller sends the electric leakage risk early warning signal when receiving the electric leakage risk early warning instruction, and when the controller receives the adjusted threshold, the controller sets the threshold as the adjusted threshold, so that the real-time monitoring of the protected circuit is realized.
As shown in fig. 2, in an embodiment of the present invention, the residual current protection device further includes: a signal processor 8;
the residual current transformer 1 is connected with the signal processor 8;
the signal processor 8 is connected with the analog-to-digital converter 4;
the signal processor 8 is configured to perform filtering processing on the analog signal related to the residual current, and send the filtered analog signal related to the residual current to the analog-to-digital converter 4.
The embodiment of the utility model provides an in, the analog signal that residual current transformer gathered sends for adc again after signal processor filters for the digital signal that adc obtained is more accurate, and the current value of the residual current that the controller determined is more accurate.
In an embodiment of the present invention, the signal processor includes: a first order low pass filter and a second order low pass filter;
the residual current transformer is connected with the input end of the first-order low-pass filter;
the output end of the first-order low-pass filter is connected with the input end of the second-order low-pass filter;
and the output end of the second-order low-pass filter is connected with the analog-to-digital converter.
In an embodiment of the present invention, the signal processor is implemented by a first-order low-pass filter and a second-order low-pass filter.
Specifically, the first-order low-pass filter may include a first filter resistor and a first filter capacitor, and a first terminal of the first filter resistor is connected to a first terminal of the first filter capacitor. The second end of the first filter resistor and the second end of the first filter capacitor form the input end of the first-order low-pass filter, and the first end of the first filter resistor and the second end of the first filter capacitor form the output end of the first-order low-pass filter.
Specifically, the second-order low-pass filter may include a second filter resistor, a third filter resistor, a second filter capacitor, and a third filter capacitor, where a first end of the second filter resistor is connected to a first end of the third filter resistor and a first end of the second filter capacitor, a second end of the third filter resistor is connected to a first end of the third filter capacitor, and a second end of the third filter capacitor is connected to a second end of the second filter capacitor. The second end of the second filter resistor and the second end of the second filter capacitor form an input end of the second-order low-pass filter, and the second end of the third filter resistor and the second end of the third filter capacitor form an output end of the second-order low-pass filter.
In an embodiment of the present invention, the communication module includes: any one or more of a wireless module, an infrared communication port, a serial port and a power line communication port.
The embodiment of the utility model provides an in, communication module can be wireless module, and communication module can interact through wireless network and external equipment. The communication module may be an infrared communication port, and the communication module may interact with an external device through infrared rays. The communication module can be a serial port, such as RS232, and the communication module can interact with an external device through a serial port transmission line. The communication module may be a power line communication port through which the communication module may interact with an external device.
As shown in fig. 3, in an embodiment of the present invention, the residual current protection device further includes: a power supply module 9;
the power supply module 9 is connected with the controller 7;
and the power supply module 9 is used for supplying power to the controller 7.
As shown in fig. 4, in an embodiment of the present invention, the residual current transformer 1 includes: a secondary coil 101 and a magnetic core 102;
the secondary coil 101 is wound around the magnetic core 102;
the magnetic core 102 is sleeved on the protected circuit;
the secondary coil 101 is connected to the analog-to-digital converter 4.
The embodiment of the utility model provides an in, when having residual current in by the protection circuit, can respond to the analog signal relevant with the residual current through magnetic core and secondary coil to pass through secondary coil output with the analog signal relevant with the residual current and give analog-to-digital converter. Wherein the analog signal related to the residual current may be a voltage analog signal across the secondary coil.
As shown in fig. 5, in an embodiment of the present invention, the residual current protection device further includes: an operational amplifier A, a first resistor R1, a second resistor R2 and a third resistor R3;
the output end of the operational amplifier a is respectively connected with the first end of the secondary coil 101, the first end of the first resistor R1 and the analog-to-digital converter 4;
the non-inverting input end of the operational amplifier A is respectively connected with the second end of the first resistor R1 and the first end of the second resistor R2;
the inverting input end of the operational amplifier a is respectively connected with the first end of the third resistor R3 and the second end of the secondary coil 101;
the second end of the second resistor R2 is grounded, and the second end of the third resistor R3 is grounded.
The embodiment of the utility model provides an in, operational amplifier, first resistance, second resistance and third resistance have been set up between secondary coil and analog-to-digital converter, can carry out filtering and amplification processing to the analog signal that is relevant with the residual current of secondary coil output through operational amplifier, first resistance, second resistance and third resistance, with the filtering and the analog signal output that is relevant with the residual current after the amplification processing for analog-to-digital converter.
As shown in fig. 6, an embodiment of the present invention provides a residual current protection system, including:
a concentrator 11 and at least one residual current protection device 12 according to any of the embodiments of the present invention;
the concentrator 11 is connected with external equipment;
the communication module 6 of each residual current protection device 12 is connected to the concentrator 11;
the concentrator 11 is configured to send the current value of the residual current, the current value of the branch current, and the voltage value of the phase line voltage sent by each communication module to the external device.
The embodiment of the utility model provides an in, the concentrator gathers the current value of the residual current that each residual current protection device sent, the current value of branch road current and the voltage value of phase line voltage, sends for external equipment after gathering. For example, each building is provided with a concentrator, each household in each building is provided with a residual current protection device, and the concentrator can send the current value of residual current, the current value of branch current and the voltage value of phase line voltage sent by the residual current protection devices of the whole building to external equipment together, so that the external equipment can monitor conveniently. The external device may be a remote control monitoring master station.
In an embodiment of the present invention, the concentrator is connected to the external device through a network based on a general packet radio service technology.
In an embodiment of the present invention, the concentrator can perform remote interaction with an external device through a network based on a general packet radio service technology.
Additionally, in the embodiment of the utility model provides an in, external equipment can be based on the received residual current the branch road current the digital signal with phase line voltage's digital signal carries out leakage current's monitoring and the early warning of electric leakage risk to each by protection circuit.
The embodiment of the utility model provides a pair of residual current protection device can trip protection when being exceeded the threshold value by protection circuit's residual current, also can will be collected and record by residual current, branch circuit and the phase line voltage during the protection circuit operation to send for external equipment through communication module, external equipment can be to being carried out real time monitoring by protection circuit.
The utility model discloses each embodiment has following beneficial effect at least:
in the embodiment of the utility model, the residual current transformer, the current measuring module and the voltage measuring module are respectively arranged for the protected circuit, the residual current of the protected circuit is sensed by the residual current transformer, the branch current and the phase line voltage of the protected circuit are respectively measured by the current measuring module and the voltage measuring module, the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage are sent to the external equipment by the controller through the communication module, thus, the external equipment can check the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage of the protected circuit, and can generate the electric leakage risk early warning instruction and adjust the threshold value according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage, the controller sends the electric leakage risk early warning signal when receiving the electric leakage risk early warning instruction, and when the controller receives the adjusted threshold, the controller sets the threshold as the adjusted threshold, so that the real-time monitoring of the protected circuit is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.
Claims (9)
1. A residual current protection device, comprising:
the device comprises a residual current transformer (1), a current measuring module (2), a voltage measuring module (3), an analog-to-digital converter (4), a relay module (5), a communication module (6) and a controller (7);
the residual current transformer (1) is connected with the analog-to-digital converter (4);
the current measuring module (2), the voltage measuring module (3), the analog-to-digital converter (4), the relay module (5) and the communication module (6) are all connected with the controller (7);
the residual current transformer (1) is used for sensing residual current of a protected circuit, obtaining an analog signal related to the residual current and sending the analog signal related to the residual current to the analog-to-digital converter (4);
the analog-to-digital converter (4) is used for converting an analog signal related to the residual current into a digital signal related to the residual current and sending the digital signal related to the residual current to the controller (7);
the current measuring module (2) is used for measuring the current value of the branch current of the protected circuit and sending the current value of the branch current to the controller (7);
the voltage measuring module (3) is used for measuring the voltage value of the phase line voltage of the protected circuit and sending the voltage value of the phase line voltage to the controller (7);
the controller (7) is configured to determine a current value of the residual current according to a digital signal related to the residual current, trigger the relay module (5) to perform trip protection on the protected circuit when the current value of the residual current exceeds a threshold value, send the current value of the residual current, the current value of the branch current, and the voltage value of the phase line voltage to an external device through the communication module (6), send an electric leakage risk early warning signal when an electric leakage risk early warning instruction sent by the external device is received, and set the threshold value as an adjusted threshold value when the adjusted threshold value sent by the external device is received;
the electric leakage risk early warning instruction is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage;
and the adjusted threshold value is generated by the external equipment according to the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage.
2. The residual current protection device according to claim 1,
further comprising: a signal processor (8);
the residual current transformer (1) is connected with the signal processor (8);
the signal processor (8) is connected with the analog-to-digital converter (4);
and the signal processor (8) is used for filtering the analog signal related to the residual current and sending the filtered analog signal related to the residual current to the analog-to-digital converter (4).
3. The residual current protection device according to claim 1,
the communication module (6) comprising: any one or more of a wireless module, an infrared communication port, a serial port and a power line communication port.
4. The residual current protection device according to claim 1,
further comprising: a power supply module (9);
the power supply module (9) is connected with the controller (7);
the power supply module (9) is used for supplying power to the controller (7).
5. The residual current protection device according to claim 2,
the signal processor (8) comprises: a first order low pass filter and a second order low pass filter;
the residual current transformer (1) is connected with the input end of the first-order low-pass filter;
the output end of the first-order low-pass filter is connected with the input end of the second-order low-pass filter;
and the output end of the second-order low-pass filter is connected with the analog-to-digital converter (4).
6. The residual current protection device according to claim 1,
the residual current transformer (1) comprises: a secondary coil (101) and a magnetic core (102);
the secondary coil (101) is wound on the magnetic core (102);
the magnetic core (102) is sleeved on the protected circuit;
the secondary coil (101) is connected with the analog-to-digital converter (4).
7. The residual current protection device according to claim 6,
further comprising: an operational amplifier (A), a first resistor (R1), a second resistor (R2), and a third resistor (R3);
the output end of the operational amplifier (A) is respectively connected with the first end of the secondary coil (101), the first end of the first resistor (R1) and the analog-to-digital converter (4);
the non-inverting input end of the operational amplifier (A) is respectively connected with the second end of the first resistor (R1) and the first end of the second resistor (R2);
the inverting input end of the operational amplifier (A) is respectively connected with the first end of the third resistor (R3) and the second end of the secondary coil (101);
the second end of the second resistor (R2) is grounded, and the second end of the third resistor (R3) is grounded.
8. A residual current protection system, comprising:
a concentrator (11) and at least one residual current protection device (12) according to any one of claims 1 to 7;
the concentrator (11) is connected with external equipment;
the communication module (6) of each residual current protection device (12) is connected to the concentrator (11);
the concentrator (11) is used for sending the current value of the residual current, the current value of the branch current and the voltage value of the phase line voltage sent by each communication module to the external equipment.
9. The residual current protection system according to claim 8,
the concentrator (11) is connected to the external device via a general packet radio service technology based network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921589567.1U CN210577737U (en) | 2019-09-23 | 2019-09-23 | Residual current protection device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921589567.1U CN210577737U (en) | 2019-09-23 | 2019-09-23 | Residual current protection device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363935A (en) * | 2021-06-21 | 2021-09-07 | 慈溪市一栋电子有限公司 | Leakage protector |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363935A (en) * | 2021-06-21 | 2021-09-07 | 慈溪市一栋电子有限公司 | Leakage protector |
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Granted publication date: 20200519 |