CN210803700U - Secondary circuit device for preventing multimeter mis-measurement relay protection - Google Patents
Secondary circuit device for preventing multimeter mis-measurement relay protection Download PDFInfo
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- CN210803700U CN210803700U CN201921331508.4U CN201921331508U CN210803700U CN 210803700 U CN210803700 U CN 210803700U CN 201921331508 U CN201921331508 U CN 201921331508U CN 210803700 U CN210803700 U CN 210803700U
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Abstract
The utility model discloses a prevent that universal meter miscasure from continuing to protect secondary circuit device, include: a processor, a relay and an instrumentation amplifier; the method is characterized in that: the input end of the instrument amplifier is electrically connected with the relay; the output end of the instrument amplifier is electrically connected with the double operational amplifiers; the dual operational amplifier is electrically connected with the processor; the processor is electrically connected with the triode, and the triode is electrically connected with the relay. The utility model discloses whether can earlier automatic identification measuring secondary circuit electrified before using universal meter resistance shelves measuring resistance, if electrified, then shutting pen-shape metre output measurement voltage, avoid when carrying out the measurement on relay protection secondary circuit, measure the gauge damage that electrified return circuit leads to because of the mistake uses universal meter resistance shelves, the person is electrocuted, even the emergence of electric power safety accidents such as equipment tripping operation.
Description
Technical Field
The utility model relates to the technical field of instruments, specifically a prevent that universal meter miscasure from continuing to protect secondary circuit device.
Background
The digital multimeter that uses at present has integrateed measuring function such as electric current, voltage, resistance usually, and abundant function brings huge convenience for people, when using different functions, only need with the multimeter switch to corresponding gear can.
The resistance measuring principle of all digital multimeters is obtained by applying a small power supply to a measuring loop and calculating through ohm's law, so that all meters need to be carried out under the condition that the loop is not electrified when resistance level is measured.
When a relay protection secondary circuit works, the multimeter is mistakenly used for measuring an electrified circuit, so that the damage of the meter and the electric shock of a human body or even the tripping of equipment can be caused, and the occurrence of an electric power safety accident event can be caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides an automatic identification surveys secondary circuit whether electrified and reopen multimeter output measurement's mistake preventing device according to the measuring result before using multimeter resistance shelves measuring resistor.
The utility model discloses a realize through following technique:
the utility model provides a prevent that universal meter miscasurement from continuing to protect secondary circuit device, includes: a processor, a relay and an instrumentation amplifier; the input end of the instrument amplifier is electrically connected with the relay; the output end of the instrument amplifier is electrically connected with the double operational amplifiers; the dual operational amplifier is electrically connected with the processor; the processor is electrically connected with the triode, and the triode is electrically connected with the relay.
Further, the processor is a single chip microcomputer.
Furthermore, a low-pass filter circuit is arranged between the output end of the instrument amplifier and the double operational amplifier.
Further, the error detection prevention device further comprises a power supply module, and the power supply module is electrically connected with a battery of the instrument amplifier.
The utility model has the advantages that: whether the device automatic identification secondary circuit is electrified before measuring resistance avoids the occurrence of electric power safety accidents such as personal electric shock, even equipment tripping and the like due to meter damage caused by measuring the electrified circuit by mistakenly using a resistance gear of a multimeter when the secondary circuit of the power system is measured.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of a control and signal conditioning circuit according to an embodiment of the present invention.
Fig. 3 is a connection circuit diagram of a processor according to an embodiment of the present invention.
Reference signs mean: 1. a processor; 2. an instrumentation amplifier; 3. a relay; 4. a dual operational amplifier; 5. a triode; 6. and a power supply module.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the embodiments.
As shown in fig. 1-3, a relay protection secondary circuit device for preventing multimeter from mis-measuring comprises: the system comprises a processor 1, a relay 3 and an instrument amplifier 2; the common end of the relay 3 is connected with a red and black meter pen, the normally open contact is connected with a red and black hole seat of a multimeter seat, and the normally closed contact is electrically connected with the instrument amplifier 2 by a lead; the output end of the instrument amplifier 2 is electrically connected with the double operational amplifier 4; the dual operational amplifier 4 is electrically connected with a P1.0 pin on the processor 1; the pin P1.4 of the processor 1 is electrically connected with the triode 5, and the triode 5 is electrically connected with the relay 3.
The processor 1 is an MSP430G2553 singlechip.
The relay 3 is a single-pole double-throw relay.
A low-pass filter circuit is arranged between the output end of the instrument amplifier 2 and the double operational amplifier 4, and the low-pass filter circuit comprises a resistor and a capacitor.
The device for preventing error detection further comprises a power supply module 6, wherein the power supply module 6 is a WRA0505S power supply module, and the power supply module 6 is electrically connected with a battery of the instrument amplifier 2 and converts the electricity output by the battery into +/-5V direct current.
The instrumentation amplifier 2 and the relay 3 form a main circuit, a resistor is arranged between the instrumentation amplifier 2 and the relay 3 to attenuate the voltage of a secondary charged loop component to be detected to 2/500, and the attenuated voltage is input to a low-pass filter circuit through a pin of the instrumentation amplifier 2 and is input to a pin P1.0 of the processor 1 through a signal conditioning circuit formed by the dual operational amplifier 4.
The P1.4 pin of the processor 1 is electrically connected with the triode 5, the triode 5 drives the relay 3, and the connection of the meter pen line, the meter seat and the main detection circuit is controlled and switched through the action of the relay 3.
Treater 1 incessantly detects the main detection return circuit voltage that fig. 2 shows, if the secondary circuit components and parts that await measuring have voltage, treater 1's AD detection voltage can change, and relay 3 does not move, has prevented inside the pen-shape metre with electrified signal input to the meter.
The above is only the preferred embodiment of the present invention, and to the technical personnel in the technical field, without departing from the present invention, the embodiment can still be modified, and the corresponding modification should also be regarded as the protection scope of the present invention.
Claims (4)
1. The utility model provides a prevent that universal meter miscasurement from continuing to protect secondary circuit device, includes: a processor, a relay and an instrumentation amplifier; the method is characterized in that: the input end of the instrument amplifier is electrically connected with the relay; the output end of the instrument amplifier is electrically connected with the double operational amplifiers; the dual operational amplifier is electrically connected with the processor; the processor is electrically connected with the triode, and the triode is electrically connected with the relay.
2. The apparatus for preventing multimeter mis-measurement relay protection secondary circuit as recited in claim 1, wherein: the processor is a single chip microcomputer.
3. The apparatus for preventing multimeter mis-measurement relay protection secondary circuit as recited in claim 1, wherein: and a low-pass filter circuit is arranged between the output end of the instrument amplifier and the double operational amplifiers.
4. The apparatus for preventing multimeter mis-measurement relay protection secondary circuit as recited in claim 1, wherein: the device for preventing error detection further comprises a power supply module, wherein the power supply module is electrically connected with a battery of the instrument amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331508.4U CN210803700U (en) | 2019-08-16 | 2019-08-16 | Secondary circuit device for preventing multimeter mis-measurement relay protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331508.4U CN210803700U (en) | 2019-08-16 | 2019-08-16 | Secondary circuit device for preventing multimeter mis-measurement relay protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210803700U true CN210803700U (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921331508.4U Active CN210803700U (en) | 2019-08-16 | 2019-08-16 | Secondary circuit device for preventing multimeter mis-measurement relay protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210803700U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505385A (en) * | 2020-11-16 | 2021-03-16 | 广东电网有限责任公司 | Universal meter and use method thereof |
-
2019
- 2019-08-16 CN CN201921331508.4U patent/CN210803700U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505385A (en) * | 2020-11-16 | 2021-03-16 | 广东电网有限责任公司 | Universal meter and use method thereof |
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