CN211478599U - Electric leakage monitoring device - Google Patents
Electric leakage monitoring device Download PDFInfo
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- CN211478599U CN211478599U CN201921689534.4U CN201921689534U CN211478599U CN 211478599 U CN211478599 U CN 211478599U CN 201921689534 U CN201921689534 U CN 201921689534U CN 211478599 U CN211478599 U CN 211478599U
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Abstract
An object of the utility model is to provide an electric leakage monitoring device, electric leakage monitoring device include three current transformer, change over switch, signal conversion module and singlechip. The transfer switch is provided with three groups of transfer input ends and transfer output ends, and the three current transformers are respectively electrically connected with the three groups of transfer input ends; the conversion output end is electrically connected with the input end of the signal conversion module; the output end of the signal conversion module is electrically connected with the single chip microcomputer. The change-over switch is in a first switching state, and a current transformer is electrically connected with the signal conversion module through a conversion output end; in a second switching state, two current transformers are electrically connected with the signal conversion module through the conversion output end; and in a third switching state, the three current transformers are electrically connected with the signal conversion module through the conversion output end. The utility model discloses can solve present electric leakage monitoring device and need artifical real-time supervision, look over the not enough convenient problem directly perceived of electric leakage data, have good practicality.
Description
Technical Field
The utility model relates to the field of communications, particularly, relate to an electric leakage monitoring device.
Background
The leakage monitoring device is an equipment instrument for monitoring leakage phenomena, the current leakage monitoring device is mostly designed like a clamp meter, a measured leakage current collector mainly comprises an open-type current transformer, a signal conversion module converts a current signal into a voltage signal which can be collected by a single chip microcomputer, the leakage current is calculated through the operation of the single chip microcomputer, and the current is displayed on a display screen in real time according to the magnitude of the leakage current. The current measured is real-time leakage current, so that the historical leakage condition cannot be reflected, and because of the hiding property of a leakage point and the uncertainty of the use time of leakage equipment, the leakage fault cannot be detected out on site in the leakage time, so that great difficulty is brought to monitoring of leakage by workers.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electric leakage monitoring device to solve present electric leakage monitoring device and need artifical real-time supervision, look over the not enough convenient problem directly perceived of electric leakage data, there is good practicality in the in-service use.
In order to achieve the above object, the utility model provides a following technical scheme:
the leakage monitoring device comprises three current transformers, a change-over switch, a signal change-over module and a single chip microcomputer;
the change-over switch is provided with three groups of change-over input ends and one group of change-over output ends; the three current transformers are respectively arranged corresponding to the three groups of conversion input ends and are electrically connected; the conversion output end is electrically connected with the input end of the signal conversion module; the output end of the signal conversion module is electrically connected with the single chip microcomputer;
when the change-over switch is in a first switching state, one of the three current transformers forms a first branch circuit based on the change-over switch, and two ends of the first branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end;
when the change-over switch is in a second switching state, two of the three current transformers are connected in series based on the change-over switch to form a second branch circuit, and two ends of the second branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end;
and the three current transformers are sequentially connected in series based on the change-over switch to form a third branch circuit under a third switching state of the change-over switch, and two ends of the third branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end.
In an alternative embodiment, any one of the three current transformers has a first mutual inductance pole and a second mutual inductance pole; any one of the three sets of switching inputs has a first input pole and a second input pole; the conversion output end is provided with a first output pole and a second output pole;
and a first mutual inductance pole of any one of the three current transformers is electrically connected with a first input pole of the corresponding conversion input end, and a second output pole of any one of the three current transformers is electrically connected with a second input pole of the corresponding conversion input end.
In an optional implementation manner, the signal conversion module includes a current-voltage converter circuit, an input end of the current-voltage converter circuit is electrically connected to an input end of the signal conversion module, and an output end of the current-voltage converter circuit is electrically connected to an output end of the signal conversion module.
In an optional implementation manner, the signal conversion module further includes an operational amplifier, and the output end of the current-voltage converter circuit is electrically connected to the output end of the signal conversion module through the operational amplifier.
In an optional implementation mode, the leakage monitoring device further comprises a display screen, and the display screen is electrically connected with the single chip microcomputer.
In an optional implementation manner, the leakage monitoring device further includes an indicator light, and the indicator light is electrically connected to the single chip microcomputer.
In an alternative embodiment, the current transformer is an open current transformer.
In an optional implementation manner, the leakage monitoring device further includes a main power supply battery, and the main power supply battery is electrically connected to the single chip microcomputer.
In an optional implementation manner, the leakage monitoring device further includes a charging management module, and the charging management module is electrically connected to the main power supply battery.
In an optional implementation manner, the leakage monitoring device further includes a data storage module, and the data storage module is electrically connected to the single chip microcomputer.
The utility model provides an electric leakage monitoring device, this electric leakage monitoring device select different current transformer access methods through change over switch when in-service use as required, can accomplish the electric leakage monitoring of different grade type, the current signal of open type current transformer's output passes through signal conversion module convert to voltage signal, the singlechip is gathered the voltage signal of signal conversion module output and carry out the conversion and acquire electric leakage information, the singlechip will arrive through the information after the conversion simultaneously the display screen with data storage module. The display screen displays a leakage current-time curve graph and displays the real-time leakage current of the circuit by taking time as an abscissa and leakage current as an ordinate. The data of the data storage module can be called through an input device. And when the circuit is in the electric leakage state or there is historical electric leakage condition the pilot lamp can light, reminds the staff in time to monitor. This electric leakage monitoring device adopts open type current transformer, and simple to operate is swift, and monitoring data is automatic to be preserved moreover, can hang and establish and carry out many places monitoring simultaneously in measuring circuit's many places, sends the staff after the monitoring is accomplished and removes and transfer historical data, reachs the electric leakage condition at the different positions of different work periods of this circuit. The utility model discloses can solve present electric leakage monitoring device and need artifical real-time supervision, look over the not enough convenient problem directly perceived of electric leakage data, have good practicality in the in-service use.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a monitoring portion of an electrical leakage monitoring device according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a switching state of the change-over switch according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a signal conversion module according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of the general structure of the leakage monitoring device according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The first embodiment is as follows:
fig. 1 shows a schematic structural diagram of a monitoring portion of an electrical leakage monitoring device according to an embodiment of the present invention.
The electric leakage monitoring device comprises three current transformers, a change-over switch 18, a signal conversion module 17 and a single chip microcomputer 9;
the change-over switch 18 has three sets of change-over input ends and a set of change-over output ends, the three sets of change-over input ends are respectively a first change-over input end, a second change-over input end and a third change-over input end, any one of the three sets of change-over input ends comprises a first input pole and a second input pole, and the change-over output end comprises a first output pole and a second output pole; namely, the change-over switch has six input poles (reference numbers 1-6) and two output poles (reference numbers 7, 8).
Fig. 2 shows a schematic structural diagram of the switching state of the changeover switch 18 of the present embodiment. The change-over switch 18 has a first switching state, a second switching state and a third switching state, and optionally, the change-over switch 18 has an initial switching state in which input and output are completely isolated; in the following description, input electrodes that are not mentioned in various switching states may be short-circuited or open-circuited.
In the first switching state of the transfer switch 18, the first input pole 1 of the first switching input end is electrically connected to the first output pole 7, and the second input pole 2 of the first switching input end is electrically connected to the second output pole 8;
in the second switching state of the transfer switch 18, the first input pole 1 of the first transfer input terminal is electrically connected to the first output pole 7, the second input pole 2 of the first transfer input terminal is electrically connected to the first input pole 3 of the second transfer input terminal, and the second input pole 4 of the second transfer input terminal is electrically connected to the second output pole 8;
in the third switching state of the change-over switch 18, the first input electrode 1 of the first switching input end is electrically connected to the first output electrode 7, the second input electrode 2 of the first switching input end is electrically connected to the first input electrode 3 of the second switching input end, the second input electrode 4 of the second switching input end is electrically connected to the first input electrode 5 of the third switching input end, and the second input electrode 6 of the third switching input end is electrically connected to the second output electrode 8.
The three current transformers are respectively electrically connected with the three groups of conversion input ends, specifically, each current transformer is provided with a first mutual inductance electrode and a second mutual inductance electrode, and the first mutual inductance electrode and the second mutual inductance electrode of each current transformer are respectively electrically connected with the first input electrode and the second input electrode of the corresponding conversion input ends.
The conversion output end is electrically connected with the input end of the signal conversion module 17, and the single chip microcomputer 9 is electrically connected with the output end of the signal processing module 17.
As can be seen from the structure of the change-over switch 18, in the first switching state of the change-over switch 18, one of the three current transformers (the first current transformer 19 in this embodiment) forms a first branch based on the change-over switch 18, and two ends of the first branch are electrically connected to the input end of the signal conversion module 17 through the conversion output end;
in a second switching state of the change-over switch 18, two current transformers (a first current transformer 19 and a second current transformer 20 in this embodiment) of the three current transformers are connected in series based on the change-over switch 18 to form a second branch, and two ends of the first branch are electrically connected to the input end of the signal conversion module 17 through the conversion output end;
in a third switching state of the change-over switch 18, the three current transformers are sequentially connected in series based on the change-over switch 18 to form a third branch, and two ends of the third branch are electrically connected with the input end of the signal conversion module 17 through the conversion output end.
In the first switching state of the change-over switch 18, the leakage monitoring device is used for monitoring leakage of a single line of the multi-phase line through one of the three current transformers (the first current transformer 19 in the embodiment); in the second switching state of the change-over switch 18, the leakage monitoring device is configured to form a current difference circuit loop through two current transformers (the first current transformer 19 and the second current transformer 20 in this embodiment) of the three current transformers, and perform leakage monitoring on two wires, such as a live wire and a ground wire, a zero wire and a ground wire, of the multi-phase wire; in the third switching state of the change-over switch 18, the leakage monitoring device is configured to form a zero-sequence current filter circuit through the three current transformers to perform leakage monitoring on three lines of the multi-phase power.
Fig. 3 shows a schematic circuit configuration diagram of the signal conversion module 17 of the present embodiment. The conversion output end is provided with a first output pole and a second output pole, and as can be seen from the structure, the conversion output end of the conversion switch 18 outputs a current signal, so that the current signal needs to be converted into a voltage signal for the convenience of processing by the single chip microcomputer 9.
Therefore, in the present embodiment, the signal conversion module 17 includes a current-voltage converter circuit for converting the current signal at the conversion output terminal into a voltage signal. In a specific implementation, since the current signal needs to be conducted through the two wires, after the current signal is converted into the voltage signal, the voltage signal can be represented in a manner of voltage to ground (voltage zero point), and therefore, the two-wire current signal can be converted into the voltage signal transmitted through the single wire. Specifically, the current flows in from the upper end of R1 and flows out from the lower end. The output voltage UA is (R5/R3) (U1-U2) ═ U1-U2, UA is the voltage difference between two ends of the resistor R1, and if the current flowing through the resistor is 20mA, the generated voltage is 20 × 100 ═ 2000mV, and the voltage has not reached the voltage measurement range of the single chip microcomputer (the default range detected by the single chip microcomputer AD is 0-5V), so in order to efficiently utilize the range of the single chip microcomputer AD, the voltage signal needs to be further amplified.
After the current signal related to the electric leakage is converted into the voltage signal, in order to facilitate the identification of the single chip microcomputer, the voltage signal needs to be adjusted to a reasonable range, specifically, the signal conversion module 17 further comprises an operational amplifier (LM324) which forms a differential amplification circuit through a wiring mode shown in the figure, and the output end of the current-voltage converter circuit is electrically connected with the output end of the signal conversion module through the operational amplifier.
Specifically, the singlechip 9 of this embodiment can be singlechips such as 51 series singlechips, ARM series treater, STM32 chip, the utility model discloses a singlechip 9's optional usable range is comparatively extensive.
According to the structure, the leakage monitoring device of the embodiment acquires a single-line leakage current signal, a double-line leakage current signal or a three-line leakage current signal through the current transformer, the leakage current signal is transmitted to the single chip microcomputer 9 after being converted and amplified through current and voltage, the single chip microcomputer 9 calculates and judges the leakage condition of the electric wire, and the leakage monitoring device has good practicability.
Example two:
fig. 4 is a schematic diagram illustrating a general structure of the leakage monitoring device according to this embodiment. On the basis of the first embodiment, in an optional implementation manner, the leakage monitoring device further includes a display screen 10, and an input port of the display screen 10 is connected to the general I/O port of the single chip microcomputer 1. Optionally, display screen 10 can be the LCD display screen, because the utility model discloses a graphical information that electric leakage monitoring devices need output is more, and it needs to show except that the display data is coordinate curve graph still, so the LCD display screen that this embodiment used is TFT LCD 2.8 cun LCD screen, TFT LCD 2.8 cun LCD screen adopts SPI serial bus, only need to connect several IO input and can light the demonstration, will several data input interface of display screen 10 respectively with 9 corresponding IO port electric connection of singlechip can. The display screen 10 not only displays the real-time leakage current, but also displays a graph of the relation between the leakage current and time, specifically, the graph of the leakage current and the time is shown in a rectangular coordinate system by taking the time as an abscissa and the leakage current as an ordinate. The display screen 10 also displays the current measurement type (earth, single phase, three items), the current time and date, whether current leakage exists, whether historical leakage records exist, and other data.
In an optional implementation manner, the leakage monitoring device further includes an indicator light 15, one end of the indicator light 15 is connected to a power supply, and the other end of the indicator light is connected in series to a resistor and is connected to an I/O pin of the single chip microcomputer 9 through a wire. The indicating lamp 15 can be a light emitting diode, an LED lamp with the model of DXG-F3FGEJG/H is selected in the embodiment, when electric leakage occurs in a circuit or historical electric leakage exists, the singlechip 9 and an I/O pin connected with the indicating lamp 15 output low level, and the indicating lamp 15 is powered on and lightened. The indicator light 15 is used for prompting whether the current leakage or the historical leakage exists. In specific implementation, two groups of indicator lamps can be selected to respectively prompt current electric leakage and historical electric leakage.
In an optional implementation mode, the current transformer is specifically an open type current transformer, the open type current transformer is convenient to install, a bus does not need to be detached during circuit measurement, live operation can be performed, the portability of the leakage monitoring device is met, and the open type current transformer can be a CTSA series open type current transformer.
In an optional implementation manner, the leakage monitoring device further includes a main power supply battery 13, the main power supply battery 13 is electrically connected to the power input interface of the single chip microcomputer 9, and the type of the main power supply battery 13 is a lithium battery.
In an optional implementation manner, the leakage monitoring device further includes a charging management module 6, and the charging management module 14 implements functions of conversion, distribution, monitoring and other electric energy management on electric energy through a power management chip built therein, and can identify a power supply amplitude of the single chip microcomputer 9, generate a corresponding short moment wave, and push a rear-stage circuit to output power. Specifically, the power management chip model is a HIP6301 chip, and the charging management module 14 is connected in series with the main power supply battery 13.
In an optional implementation manner, the leakage monitoring device further includes a data storage module 11, the data storage module 11 is composed of a microSD card socket and a microSD card, and the data storage module 11 is electrically connected to the single chip microcomputer 9. Specifically, the MOSI pin of the SPI bus of the single chip microcomputer 9 is electrically connected to the MOSI port of the microSD card through the microSD card holder, and the single chip microcomputer 9 reads data in the SD card from this pin; the MISO pin of the SPI bus of the singlechip 9 is electrically connected with the MISO port of the microSD card through the microSD card holder, and the singlechip 9 writes data into the SD card through the MISO pin. The single chip microcomputer 9 can transmit a piece of leakage information data to the data storage module 11 while outputting the leakage information to the display screen 10, the data storage module 11 is stored in the microSD card of the data storage module 11, and a worker can call historical leakage information stored in the data storage module 11 at any time through the input device 16 for the single chip microcomputer 9, so that the operation is convenient and fast, the time of the worker is saved, and the working efficiency is improved.
In this embodiment, an I/O port of the single chip microcomputer 9 is connected to an output end of an input device 16, the single chip microcomputer 9 can be controlled by the input device 16, in this embodiment, the input device 16 selects a small soft keyboard, and the small soft keyboard is convenient to carry. In addition, the leakage monitoring device further comprises a standby battery 12, and an output port of the standby battery 12 is electrically connected with an I/O port of the single chip microcomputer 9. The backup battery 12 is used for maintaining the system real-time clock of the single chip microcomputer 9 to move under the condition that the system is shut down, and the accuracy of time connection of the electric leakage record of the electric leakage monitoring device is ensured.
The utility model discloses electric leakage monitoring device at this embodiment passes through change over switch 10 control current transformer's connection form can satisfy the different requirements of measuring the electric leakage of ground wire or single wire, single-phase, three. The leakage current signal output by the current transformer is converted into a voltage signal through the signal conversion module 9 and then collected by the single chip microcomputer 9, the single chip microcomputer 9 processes and converts the voltage signal into current information, then digital information is converted into graphic information and output to the display screen 10 for displaying, and meanwhile, the single chip microcomputer 9 writes the leakage information data into the data storage module 11 for storing. When the circuit leaks electricity, no matter be leaking electricity or the electric leakage has ended, singlechip 9 all can control pilot lamp 15 lights, and the suggestion staff looks over, the information that data storage module 11 was saved can pass through input device 16 is transferred, convenient and fast. And, because the utility model discloses an electric leakage monitoring device has the function of preserving leakage information, can install a plurality of electric leakage monitoring devices on the circuit during measurement, returns to collect circuit leakage information after the measurement finishes, reduces measurement load, improves electric leakage monitoring's work efficiency. The utility model discloses can solve present electric leakage monitoring device and need artifical real-time supervision, look over the not enough convenient problem directly perceived of electric leakage data. The utility model has the characteristics of good practicality, application scope are extensive, simple structure, practicality are strong etc, can extensively use widely.
In addition, the above detailed description is made on the leakage monitoring device provided by the embodiment of the present invention, and a specific example should be adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The leakage monitoring device is characterized by comprising three current transformers, a change-over switch, a signal change-over module and a single chip microcomputer;
the change-over switch is provided with three groups of change-over input ends and one group of change-over output ends; the three current transformers are respectively arranged corresponding to the three groups of conversion input ends and are electrically connected; the conversion output end is electrically connected with the input end of the signal conversion module; the output end of the signal conversion module is electrically connected with the single chip microcomputer;
when the change-over switch is in a first switching state, one of the three current transformers forms a first branch circuit based on the change-over switch, and two ends of the first branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end;
when the change-over switch is in a second switching state, two of the three current transformers are connected in series based on the change-over switch to form a second branch circuit, and two ends of the second branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end;
and the three current transformers are sequentially connected in series based on the change-over switch to form a third branch circuit under a third switching state of the change-over switch, and two ends of the third branch circuit are electrically connected with the input end of the signal conversion module through the conversion output end.
2. The leakage monitoring device of claim 1 wherein any of the three current transformers has a first mutual inductor and a second mutual inductor; any one of the three sets of switching inputs has a first input pole and a second input pole; the conversion output end is provided with a first output pole and a second output pole;
and a first mutual inductance pole of any one of the three current transformers is electrically connected with a first input pole of the corresponding conversion input end, and a second output pole of any one of the three current transformers is electrically connected with a second input pole of the corresponding conversion input end.
3. The electrical leakage monitoring device of claim 1, wherein the signal conversion module comprises a current-to-voltage converter circuit, an input of the current-to-voltage converter circuit is electrically connected to an input of the signal conversion module, and an output of the current-to-voltage converter circuit is electrically connected to an output of the signal conversion module.
4. The leakage monitoring device of claim 3, wherein the signal conversion module further comprises an operational amplifier, and the output terminal of the current-to-voltage converter circuit is electrically connected to the output terminal of the signal conversion module through the operational amplifier.
5. The electrical leakage monitoring device of claim 1, further comprising a display screen, wherein the display screen is electrically connected to the single-chip microcomputer.
6. The electrical leakage monitoring device of claim 1, further comprising an indicator light, wherein the indicator light is electrically connected to the single-chip microcomputer.
7. The electrical leakage monitoring device of claim 1, wherein the current transformer is an open current transformer.
8. The electrical leakage monitoring device of claim 1, further comprising a main power supply battery electrically connected to the single-chip microcomputer.
9. The electrical leakage monitoring device according to claim 8, further comprising a charging management module, wherein the charging management module is electrically connected to the main power supply battery.
10. The electrical leakage monitoring device of claim 1, further comprising a data storage module, wherein the data storage module is electrically connected to the single-chip microcomputer.
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| CN201921689534.4U CN211478599U (en) | 2019-10-10 | 2019-10-10 | Electric leakage monitoring device |
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| CN201921689534.4U CN211478599U (en) | 2019-10-10 | 2019-10-10 | Electric leakage monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255568A (en) * | 2020-10-21 | 2021-01-22 | 泉州睿泽恒创物联网科技有限公司 | High-sensitivity electric leakage detection system and detection method thereof |
| CN115792703A (en) * | 2022-11-09 | 2023-03-14 | 广东正力通用电气有限公司 | Smart city lighting power supply line electric leakage monitoring platform and monitoring method |
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2019
- 2019-10-10 CN CN201921689534.4U patent/CN211478599U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255568A (en) * | 2020-10-21 | 2021-01-22 | 泉州睿泽恒创物联网科技有限公司 | High-sensitivity electric leakage detection system and detection method thereof |
| CN115792703A (en) * | 2022-11-09 | 2023-03-14 | 广东正力通用电气有限公司 | Smart city lighting power supply line electric leakage monitoring platform and monitoring method |
| CN115792703B (en) * | 2022-11-09 | 2023-08-22 | 广东正力通用电气有限公司 | Smart city illumination power supply line electric leakage monitoring platform and monitoring method |
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