CN110879307A - Voltage resistance test meter based on relay protection specialty - Google Patents
Voltage resistance test meter based on relay protection specialty Download PDFInfo
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- CN110879307A CN110879307A CN201911196581.XA CN201911196581A CN110879307A CN 110879307 A CN110879307 A CN 110879307A CN 201911196581 A CN201911196581 A CN 201911196581A CN 110879307 A CN110879307 A CN 110879307A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
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Abstract
The invention provides a voltage and resistance test meter based on relay protection specialties, which comprises a body and a meter pen, wherein a display screen and a meter pen jack are arranged on the body, the meter pen is inserted into the meter pen jack, the meter also comprises a gear turntable, a voltage measurement gear and a resistance measurement gear, the gear turntable, the voltage measurement gear and the resistance measurement gear are arranged on the body, the gear turntable is used for switching gears, the internal resistance of the resistance measurement gear is 3.7-12 k omega, the voltage measurement gear and the resistance measurement gear are arranged on the body, the function of the meter is simplified, compared with a multi-functional test multimeter, the production and manufacturing cost is reduced, the gear switching is convenient for a user, the gear switching efficiency is improved, the internal resistance of the resistance gear of the meter is properly improved, even if the meter pen is mistakenly connected to a live loop, the generated additional current is far smaller than tripping current, therefore, the measuring meter is better protected, and meanwhile, the short-circuit fault of the secondary circuit is avoided.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a voltage resistance test meter based on relay protection specialties.
Background
The universal meter is also called as a multiplex meter, a multi-purpose meter, a three-purpose meter, a multiplex meter and the like, is an indispensable measuring instrument for departments such as power electronics and the like, and is one of the most frequently used instruments in the working process of a secondary circuit in a relay protection professional, the traditional universal meter comprises a current measuring gear, a resistance measuring gear, 20 gears such as a voltage measuring gear and the like, and only voltage and resistance need to be measured when the secondary circuit works in the relay protection professional, the traditional universal meter has an over-complete function, so that the universal meter is high in cost, the gear design is complex, gears need to be converted for many times during working, and the use is inconvenient, in addition, the internal resistance of the resistance measuring gear of the traditional universal meter is small, and is close to 0 omega, and potential safety: if the resistance measuring gear is connected into the live loop by accident, not only the damage of the multimeter can be caused, but also the short circuit of the secondary loop can be caused, and the faults of switch tripping or direct current grounding and the like are caused.
Disclosure of Invention
Therefore, the voltage resistance test meter based on relay protection specialties is needed to be provided for the problems that the traditional multimeter has multiple functions and high cost, and the short circuit of the secondary circuit is caused by mistakenly connecting the meter pen into the secondary circuit, so that the switch is tripped or the direct current is grounded and other faults are caused.
The utility model provides a voltage resistance test meter based on relay protection specialty, includes body, pen-shape metre, be provided with display screen and pen-shape metre jack on the body, the pen-shape metre inserts and locates on the pen-shape metre jack, this meter still includes gear carousel, voltage measurement gear and resistance measurement gear, the gear carousel voltage measurement gear reaches the resistance measurement gear set up in on the body, the gear carousel is used for switching the gear, the internal resistance of resistance measurement gear is 3.7k omega ~ 12k omega.
Above-mentioned voltage resistance test meter based on relay protection specialty, through set up voltage measurement gear and resistance measurement gear on the body, the function has been simplified to the meter, universal meter for multi-functional test, production manufacturing cost has been reduced, in addition, the user need carry out the gear switching many times when secondary circuit measurement work, only keep resistance measurement gear and voltage measurement gear with the gear of meter, so that the user carries out the gear switching, promote the efficiency of gear switching, set up the internal resistance of resistance measurement gear to 3.7k omega ~ 12k omega, suitably improve the internal resistance of meter resistance gear, even the mistake is connected the pen-shape metre in electrified return circuit, the additional current of production will be far less than trip current, thereby when protecting the meter better, avoid secondary circuit short circuit trouble.
In one embodiment, the internal resistance of the resistance measurement gear is 4k Ω.
In one embodiment, the voltage resistance test meter based on relay protection specialties further comprises an OFF gear, and the OFF gear is arranged on the body.
In one embodiment, a buzzer is arranged on the resistance measurement gear, and the buzzer is used for sending out a prompt signal when the gear turntable is switched to the resistance measurement gear.
In one embodiment, the buzzer is used for sending out a prompt signal when the resistance value measured by the meter pen is smaller than a preset threshold value.
In one embodiment, the voltage resistance test meter based on relay protection specialties further comprises a backlight button, a backlight lamp is arranged on the display screen, the backlight button is electrically connected with the backlight lamp, and the backlight button is used for controlling the backlight lamp to work.
In one embodiment, a buckle is arranged on one side of the body, which faces away from the display screen.
In one embodiment, the clasp is a magnetic clasp.
In one embodiment, a hanging rope is arranged on the side, opposite to the display screen, of the body.
In one embodiment, the lanyard is a magnetically attractive lanyard.
Drawings
Fig. 1 is a schematic structural diagram of a view angle of a voltage resistance test meter based on relay protection specialties according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another view of the voltage resistance test meter based on relay protection specialties according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that 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. 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
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 herein in the description of the invention 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.
For example, the voltage and resistance test meter based on relay protection major comprises a body and a meter pen, wherein a display screen and a meter pen jack are arranged on the body, the meter pen is inserted into the meter pen jack, the voltage and resistance test meter further comprises a gear turntable, a voltage measurement gear and a resistance measurement gear, the gear turntable, the voltage measurement gear and the resistance measurement gear are arranged on the body, and the gear turntable is used for switching the gear of the meter, and the internal resistance of the resistance measurement gear is 3.7k omega-12 k omega.
Above-mentioned voltage resistance test meter based on relay protection specialty, through set up voltage measurement gear and resistance measurement gear on the body, the function has been simplified to the meter, universal meter for multi-functional test, production manufacturing cost has been reduced, in addition, the user need carry out the gear switching many times when secondary circuit measurement work, only keep resistance measurement gear and voltage measurement gear with the gear of meter, so that the user carries out the gear switching, promote the efficiency of gear switching, set up the internal resistance of resistance measurement gear to 3.7k omega ~ 12k omega, suitably improve the internal resistance of meter resistance gear, even the mistake is connected the pen-shape metre in electrified return circuit, the additional current of production will be far less than trip current, thereby when protecting the meter better, avoid secondary circuit short circuit trouble.
In one embodiment, please refer to fig. 1, a voltage and resistance test meter 10 based on relay protection specialties includes a body 100 and a meter pen (not shown), the body 100 is provided with a display screen 200 and a meter pen jack 300, the meter pen is inserted into the meter pen jack 300, the meter 10 further includes a gear dial 400, a voltage measurement gear 410 and a resistance measurement gear 420, the gear dial 400, the voltage measurement gear 410 and the resistance measurement gear 420 are disposed on the body 100, the gear dial 400 is used for switching gears, and an internal resistance of the resistance measurement gear 420 is 3.7k Ω to 12k Ω.
Specifically, the measuring meter is provided with a measuring gear, and the measuring gear consists of the voltage measuring gear and the resistance measuring gear to form a measuring function of the measuring meter, so that the function of the measuring meter is simplified, and the cost of the measuring meter is reduced.
Specifically, the display screen is used for displaying measurement data, the gear dial is used for switching gears, namely, the gears of the measuring meter are switched, a user switches the gears to a voltage measurement gear or a resistance measurement gear by rotating the gear dial, and when the gear dial is rotated to the voltage measurement gear, the voltage of the object to be measured can be measured by contacting the meter pen with the object to be measured; when the gear turntable rotates to a resistance measuring gear, the resistance of the object to be measured can be measured by contacting the object to be measured through the meter pen.
It should be understood that, in the secondary circuit measurement work of relay protection specialty, resistance and voltage that need only measure secondary circuit with the gauge usually can satisfy the work demand of secondary circuit measurement, through set up voltage measurement gear and resistance measurement gear on the body, the gauge function has been simplified, universal meter for multi-functional test, production manufacturing cost has been reduced, furthermore, the user is in secondary circuit measurement during operation, need carry out the gear switching many times, only keep resistance measurement gear and voltage measurement gear with the gear of gauge, so that the user carries out the gear switching, promote the efficiency that the gear switched.
It will be appreciated that the principle of measuring the position of a conventional multimeter, such as a FLUKE multimeter, for resistance measurement is via an external power supply, using ohm's law I-U/(R)g+RMeasuring) Wherein R isgIs internal resistance, RMeasuringIs the resistance value of the object to be detected), the resistance value of the object to be detected is reflected by the current of the circuit. Internal resistance R of traditional multimeter resistance measurement geargIf the multimeter is mistakenly adjusted to a resistance measuring gear, the meter pen is connected to a live loop to generate larger current, namely, the loop is short-circuited to trigger the switch to trip. Based on the principleThe internal resistance of the resistance level of the measuring meter is properly increased, and even if the meter pen is connected to the electrified loop by mistake, the generated additional current is far smaller than the tripping current. The tripping current in the actual secondary circuit is at least 0.2A, and the internal resistance is calculated to be at least 3.67k Ω, wherein 220V ÷ 0.2A ÷ 0.3 ═ 3.67k Ω, which is about 3.7k Ω. Therefore, the internal resistance of the resistance measuring gear is set to be 3.7k omega-12 k omega, a user can be prevented from misunderstanding that the meter pen is connected into the live circuit, the generated additional current can be far smaller than the trip current, the measuring meter is better protected, and meanwhile, the short circuit fault of the secondary circuit is avoided.
Above-mentioned voltage resistance test meter based on relay protection specialty, through set up voltage measurement gear and resistance measurement gear on the body, the function has been simplified to the meter, universal meter for multi-functional test, production manufacturing cost has been reduced, in addition, the user need carry out the gear switching many times when secondary circuit measurement work, only keep resistance measurement gear and voltage measurement gear with the gear of meter, so that the user carries out the gear switching, promote the efficiency of gear switching, set up the internal resistance of resistance measurement gear to 3.7k omega ~ 12k omega, suitably improve the internal resistance of meter resistance gear, even the mistake is connected the pen-shape metre in electrified return circuit, the additional current of production will be far less than trip current, thereby when protecting the meter better, avoid secondary circuit short circuit trouble.
In one embodiment, the internal resistance of the resistance measurement gear is 4k Ω. Specifically, by increasing the internal resistance of the measuring meter, even if the measuring meter is mistakenly connected into the secondary circuit when the measuring meter is adjusted to the resistance measuring gear, the connected current is less than 0.2A, namely less than the tripping current of the secondary circuit, so as to avoid the short-circuit tripping fault of the secondary circuit, and simultaneously, the loss of the measuring meter can be avoided, but it can be understood that the larger the internal resistance of the resistance measuring gear is, the larger the electric energy consumed by the internal resistance is when measuring the resistance of an object to be measured, so that the service life of the battery of the measuring meter is influenced, because the tripping current in the secondary circuit of relay protection at least exceeds 0.2A, when the internal resistance of the measuring meter is set to be 4k omega, the current of the secondary circuit is 0.183A and less than the tripping current 0.2A, so as to avoid the tripping fault of the secondary circuit when a stylus is connected into the secondary circuit, and reserve safety margin, so as to avoid the tripping fault of the secondary circuit, the internal resistance of the measuring meter is reasonably set, so that the electric energy is consumed by less internal resistance, and the service life of the battery in the measuring meter is prolonged.
In order to facilitate the power supply for the meter to be turned OFF and save power, in one embodiment, referring to fig. 1, the voltage resistance test meter 10 based on relay protection specialties further includes an OFF stage 430, and the OFF stage 430 is disposed on the body 100. Specifically, OFF gear is the power shutdown gear, and when the gear carousel switched to the OFF gear, the measuring gauge was in the outage state, and the display screen also no longer shows, so, when the user need not use the measuring gauge, transferred the gear carousel to the OFF gear to make the measuring gauge outage, thereby reduced the power consumption of the battery of measuring gauge.
In order to further avoid that a user accesses a secondary circuit when the measuring meter rotates to a resistance measuring gear, in one embodiment, a buzzer is arranged on the resistance measuring gear, and the buzzer is used for sending a prompt signal when the gear dial is switched to the resistance measuring gear. It is specific, when the gauge table is adjusted to resistance measurement gear, if insert the pen-shape metre secondary circuit, can produce great electric current, so that secondary circuit tripping operation trouble appears, can damage the gauge table even, consequently, when gear carousel in the gauge table is adjusted to resistance measurement gear, bee calling organ sends cue signal, be in resistance measurement gear with reminding the user's gauge table, do not be connected to the pen-shape metre secondary circuit, thereby further avoid the user to insert the pen-shape metre secondary circuit when the gauge table rotates to resistance measurement gear. It can be understood that, when the gear dial rotates to the resistance measurement gear, the buzzer receives a trigger signal, so that the buzzer sends out a prompt signal, and the trigger signal can be sent out by a processing module in the measuring meter, i.e. a single chip microcomputer or a processor.
In one embodiment, the buzzer is used for sending out a prompt signal when the resistance value measured by the meter pen is smaller than a preset threshold value. It should be understood that the resistance measuring gear of the measuring meter only performs resistance value measurement, and if it is required to detect whether two lines are connected, it is usually necessary to set an on-off measuring gear to determine the connection or disconnection of the two points to be measured, that is, a conventional measuring meter needs to set two measuring gears when measuring the resistance value of the measuring resistor and measuring the on-off, in the present invention, a buzzer is provided, and the buzzer is used to send a prompt signal when the resistance value measured by the stylus is smaller than a preset threshold value, that is, the stylus measures that the two points to be measured are in a connection state, so that the on-off measuring gear and the resistance measuring gear can be combined into one, even if the resistance value of the resistor can be measured by the resistance measuring gear, the on-off measurement can be performed, thereby further simplifying the gear design of the measuring meter, the utility model is convenient for the user to use, and further reduces the manufacturing cost of the measuring gauge. Specifically, voltage resistance test table based on relay protection specialty still includes processing module, processing module is used for acquireing the resistance of pen-shape metre measuring resistor, when detecting the resistance is less than predetermineeing the threshold value, to buzzer sends trigger signal, so that buzzer sends the cue signal. Therefore, the resistance measuring gear and the on-off measuring gear can be combined into one. Further, in one embodiment, the preset threshold is 10 Ω. And when the resistance value measured by the meter pen is less than 10 omega, the buzzer sends out a prompt signal. It should be understood that the user may also set the preset threshold according to actual requirements, for example, if the user determines that the two-point conduction condition is strict, the preset threshold may be set to 5 Ω, or even smaller.
In one embodiment, the processing module is configured to detect a gear position of the gear dial, and when the gear dial is detected to be in the voltage measurement gear position; detecting whether the measuring voltage of the meter pen is zero or not and detecting whether the gear dial is switched or not; and when the measuring voltage is detected to be zero in the preset time and the gear turntable is detected to be switched to the resistance measuring gear, sending the trigger signal to the buzzer so as to enable the buzzer to send a prompt signal. Specifically, the voltage resistance test meter based on relay protection specialties further comprises the processing module, the processing module is arranged in the body and is respectively and electrically connected with the meter pen, the display screen and the gear turntable, the processing module is used for detecting the gear of the gear turntable, and when the gear turntable is detected to be in the voltage measurement gear; detecting whether the measuring voltage of the meter pen is zero or not and detecting whether the gear dial is switched or not; when the measuring voltage is detected to be zero in the preset time, and the gear turntable is detected to be switched to the resistance measuring gear, the trigger signal is sent to the buzzer, so that the buzzer sends out a prompt signal to better remind a user that the multimeter is in the resistance measuring gear, and the misinterpretation of the user is reduced, and the stylus is connected into a secondary circuit. Further, in one embodiment, the processing module is further configured to, after sending a trigger signal to the buzzer, release the locking state of the resistance measurement gear when detecting that an acknowledgement signal is received, so that the measuring instrument starts a resistance measurement function, specifically, the processing module is configured to lock the function of the resistance measurement gear when the gear dial is shifted to a voltage measurement gear, or other gears except for the resistance measurement gear, so that even if the gear dial is shifted to the resistance measurement gear, the measuring instrument cannot measure the resistance of the object to be measured, and the specific principle may be to set a switch, the switch is connected to an internal power supply of the measuring instrument, the processing module is configured to be connected to a control terminal of the switch, and when the processing module detects that the gear dial is shifted to the voltage measurement gear, and correspondingly, the contact locking, namely the processing module controls the switch to be in a conducting state, so that the measuring meter can measure the resistance value of the object to be measured. It should be understood that when the traditional measuring meter is adjusted to a resistance measuring gear, the measuring meter can be used for measuring the gear, so that the phenomenon that a user mistakenly accesses the resistance measuring gear into a secondary loop easily occurs, manual detection needs to be carried out by the user, and fool-proofing is not achieved; the processing module is further used for releasing the locking state of the resistance measurement gear after the trigger signal is sent to the buzzer and the confirmation signal is detected to be received, so that the resistance measurement function of the measuring meter is started, even if a user mistakenly adjusts the gear dial to the resistance measurement gear and accesses the secondary circuit, the internal power supply is in a disconnected state, the secondary circuit cannot be affected, the measuring meter cannot be damaged, and the fool-proof effect is achieved. When the user does need to use the measuring meter to measure the resistance value of the object to be measured, the processing module releases the locking state of the resistance measuring gear by transmitting a confirmation signal back to the processing module, so that the measuring meter can normally measure the resistance. It should be understood that the confirmation signal may be sent through some external devices, for example, referring to fig. 1, an auxiliary switch 600 is provided, and a user presses the auxiliary switch 600, so that a power supply connected to the auxiliary switch sends a confirmation signal to a processing module, further, in one embodiment, when the processing module detects that the measurement voltage is not zero within the preset time, the resistance measurement gear is locked, so as to prevent the user from switching the measurement meter to the resistance measurement gear by mistake, specifically, when the processing module detects that the measurement voltage is not zero, that is, the stylus pen is connected to the power supply, at this time, the gear dial of the measurement meter is switched to the resistance measurement gear, that is, the resistance measurement gear is connected to the secondary circuit, and the secondary circuit is affected, when the processing module detects that the measurement voltage is not zero within the preset time, the resistance measurement gear is locked, namely the resistance measurement function is locked, and even if a user mistakenly switches the gear turntable of the measuring meter to the resistance measurement gear, the secondary loop cannot be affected, so that the fool-proof effect is further realized.
In one embodiment, referring to fig. 1, the voltage resistance test meter 10 based on relay protection specialties further includes a backlight button 500, a backlight is disposed on the display screen 100, the backlight button 500 is electrically connected to the backlight, and the backlight button 500 is used to control the backlight to operate. Specifically, the backlight button is a control switch of the backlight, for example, a power supply is electrically connected to the backlight through the backlight button, and the backlight is operated by pressing the backlight button even if the backlight is lighted.
In one embodiment, referring to fig. 2, a buckle 700 is disposed on a side of the body 100 opposite to the display screen. It should be understood that when a user uses the measuring meter to measure, the user usually holds the positive meter pen with one hand and the negative meter pen with the other hand, and cannot use the hand to lift the measuring meter body, and the user is inconvenient to measure by using the one hand to lift the measuring meter body and using the other hand to operate the positive and negative meter pens. Through the dorsad at the body the one side of display screen sets up the buckle, and the user can with the gauge block on supporting the object, for example the screen is on cabinet to user's both hands can be liberated, so that the user measures. Further, in one embodiment, the clip is a magnetic clip. Specifically, magnetism is inhaled and is adopted the principle that opposite sex magnet attracted promptly to reach two object fixed connection's effect, so, when the user need place the strapping table, only need with the strapping table place in magnetic chuck can, thereby the user of being convenient for uses.
In one embodiment, a hanging rope is arranged on the side, opposite to the display screen, of the body. Specifically, the user can with the measuring gauge hangs on the screen cabinet through hanging the rope to further liberate user's both hands, so that the user adopts the pen-shape metre to measure. Further, in one embodiment, the hanging rope is a magnetic hanging rope. Specifically, the magnetic attraction hanging rope has a working principle similar to that of the magnetic attraction buckle, and is not repeated in this embodiment.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a voltage resistance test meter based on relay protection specialty, includes body, pen-shape metre, be provided with display screen and pen-shape metre jack on the body, the pen-shape metre inserts and locates on the pen-shape metre jack, its characterized in that still includes gear carousel, voltage measurement gear and resistance measurement gear, the gear carousel voltage measurement gear reaches the resistance measurement gear set up in on the body, the gear carousel is used for switching the gear, the internal resistance of resistance measurement gear is 3.7k omega ~ 12k omega.
2. The relay protection specialty-based voltage resistance test meter of claim 1, wherein the internal resistance of the resistance measurement stage is 4k Ω.
3. The relay protection specialty-based voltage resistance test meter of claim 1, further comprising an OFF gear, wherein the OFF gear is disposed on the body.
4. The relay protection specialty-based voltage resistance test meter according to claim 1, wherein a buzzer is disposed on the resistance measurement gear, and the buzzer is configured to send a prompt signal when the gear dial is switched to the resistance measurement gear.
5. The relay protection specialty-based voltage resistance test meter according to claim 4, wherein the buzzer is configured to send a prompt signal when the meter pen measures that the resistance value is smaller than a preset threshold value.
6. The relay protection specialty-based voltage resistance test meter according to claim 1, further comprising a backlight button, wherein a backlight is disposed on the display screen, the backlight button is electrically connected to the backlight, and the backlight button is used for controlling the backlight to operate.
7. The relay protection specialty-based voltage resistance test meter according to claim 1, wherein a snap is disposed on a side of the body facing away from the display screen.
8. The relay protection specialty-based voltage resistance test meter of claim 7, wherein the clip is a magnetic clip.
9. The relay protection specialty-based voltage resistance test meter according to claim 7, wherein a hanging rope is disposed on a side of the body facing away from the display screen.
10. The relay protection specialty-based voltage resistance test meter of claim 9, wherein the hanging rope is a magnetic hanging rope.
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| CN201911196581.XA CN110879307B (en) | 2019-11-29 | 2019-11-29 | Voltage resistance test meter based on relay protection specialty |
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| CN201911196581.XA CN110879307B (en) | 2019-11-29 | 2019-11-29 | Voltage resistance test meter based on relay protection specialty |
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| CN110879307A true CN110879307A (en) | 2020-03-13 |
| CN110879307B CN110879307B (en) | 2023-01-20 |
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Cited By (1)
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| 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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| CN110879307B (en) | 2023-01-20 |
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