CN210347723U - Instrument grounding wire - Google Patents
Instrument grounding wire Download PDFInfo
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- CN210347723U CN210347723U CN201920901554.7U CN201920901554U CN210347723U CN 210347723 U CN210347723 U CN 210347723U CN 201920901554 U CN201920901554 U CN 201920901554U CN 210347723 U CN210347723 U CN 210347723U
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Abstract
The application discloses instrument earth connection includes: detecting branch lines and breakage-proof grounding branch lines; the detection branch line and the anti-breaking grounding branch line are connected in parallel, one end of the detection branch line and one end of the anti-breaking grounding branch line are both connected to an instrument, and the other end of the detection branch line and the other end of the anti-breaking grounding branch line are both connected to a grounding pile; the length of the anti-breaking grounding branch line is greater than that of the detection branch line, and a detection circuit is arranged on the detection branch line and used for detecting whether the connection between the detection branch line and the grounding pile is broken or not. Through having set up the detection branch road line that length is different and having prevented disconnected ground branch road line, can break off the detection branch road line at first when the earth connection is bumped by the mistake to prevent that disconnected ground branch road is destroyed, guarantee the security of ground connection state.
Description
Technical Field
The application relates to a ground wire technical field especially relates to an instrument ground wire.
Background
The high-voltage test work usually needs to use a plurality of test instruments, the grounding wires of the test instruments are important life wires for the safety of the test instruments and test personnel, each test instrument needs to be firstly connected before use, and once the grounding wires of the test instruments are not well contacted or disconnected, the test instruments and the test personnel can be seriously injured.
In the prior art, the grounding wire of the test instrument is only a common transparent conducting wire and is fixed by a common clamp at the grounding end, namely the grounding wire is directly and fixedly clamped on the grounding pile through the common clamp.
When more instruments are used in high-voltage test work, field workers sometimes mistakenly break the grounding wire of the instrument to be difficult to detect, so that the grounding state of the instrument is damaged, and the safety of the instrument and testers is easily endangered.
SUMMERY OF THE UTILITY MODEL
The application provides an instrument earth connection, through having set up the different detection branch road line of length and prevent disconnected ground branch road line, at first can break off the detection branch road line when the earth connection is bumped by the mistake to prevent disconnected ground branch road and destroyed, guarantee the security of ground state.
In view of the above, the present application provides an instrument ground wire, including:
detecting branch lines and breakage-proof grounding branch lines;
the detection branch line and the anti-breaking grounding branch line are connected in parallel, one end of the detection branch line and one end of the anti-breaking grounding branch line are both connected to an instrument, and the other end of the detection branch line and the other end of the anti-breaking grounding branch line are both connected to a grounding pile;
the length of the anti-breaking grounding branch line is greater than that of the detection branch line, and a detection circuit is arranged on the detection branch line and used for detecting whether the connection between the detection branch line and the grounding pile is broken or not.
Optionally, the anti-break ground branch line is 25 to 35cm longer than the detection branch line.
Optionally, the detection circuit includes a buzzer, and the detection device is specifically configured to detect a resistance of a loop formed by the detection branch line and the disconnection-preventing ground branch line, and when the resistance of the loop is greater than a preset resistance value, the buzzer works and gives an alarm.
Optionally, the detection circuit further comprises: the circuit comprises a power supply, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an operational amplifier T, a comparator J and a triode Q;
one end of the power supply is connected to the grounding pile through the first resistor R1, and the other end of the power supply is connected to the instrument;
the first input end of the operational amplifier T is connected with the grounding stub, the second input end of the operational amplifier T is connected to the other end of the power supply through the eighth resistor R8, the second input end of the operational amplifier T is also connected to the output end of the operational amplifier through the ninth resistor R9, the first input end of the operational amplifier T is a non-inverting input end, and the second input end of the operational amplifier T is an inverting input end;
a first input end of the comparator J is connected to an output end of the operational amplifier T, a second input end of the comparator I is connected between the second resistor R2 and the tenth resistor R10, the second resistor R2 and the tenth resistor R10 are connected in series with the power supply, the tenth resistor R10 is further connected in parallel with the third resistor R3 and the fourth resistor R4, the first input end of the comparator J is a non-inverting input end, and the second input end of the comparator J is an inverting input end;
the output end of the comparator is connected with the base electrode of the triode Q through a fifth resistor R5, a sixth resistor R6 is connected between the base electrode and the emitting electrode of the triode Q in series, and the collector electrode of the triode Q is connected to the other end of the power supply through the buzzer and the seventh resistor R7.
Optionally, a capacitor C1 is further connected in parallel to the tenth resistor R10.
Optionally, the power supply is a dc power supply, and the voltage of the dc power supply is 3V.
Optionally, the detection branch line is further connected in parallel with a ground branch line, the ground branch line is connected with a two-position switch, and the two-position switch is further connected with the detection branch line;
when the double-position switch is switched to the position 1, the detection branch line is conducted, and the grounding branch line is disconnected;
when the two-position switch is switched to the position 2, the detection branch line is disconnected, and the grounding branch line is conducted.
Optionally, the other end of the detection branch line and the other end of the disconnection-preventing grounding branch line are clamped on the grounding pile through a grounding clamp.
According to the technical scheme, the method has the following advantages:
the detection branch line and the anti-breaking grounding branch line are arranged on the grounding line of the instrument, are different in length and are connected in parallel, and due to the fact that the detection branch line is short, when the grounding line is mistakenly touched, the detection branch line is broken first, and the anti-breaking grounding branch line is connected to the grounding pile, and therefore safety of a grounding state is guaranteed; and the detection branch line can be detected after being disconnected, so that the working personnel can recover the normal and safe grounding state.
Drawings
The present application will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of an instrument ground line according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a detection circuit according to an embodiment of the present disclosure.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present application, specific embodiments of the present application will now be described in detail with reference to the accompanying drawings.
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be understood that when an element is referred to as being "secured to" or "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. It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present application are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an instrument ground line according to an embodiment of the present disclosure.
The application provides an instrument earth connection includes: detecting a branch line 1 and an anti-breaking grounding branch line 2;
the detection branch line 1 and the anti-breaking grounding branch line 2 are connected in parallel, one end of the detection branch line 1 and one end of the anti-breaking grounding branch line 2 are both connected to an instrument, and the other end of the detection branch line 1 and the other end of the anti-breaking grounding branch line 2 are both connected to a grounding pile 3; specifically, the detection branch line 1 and the disconnection preventing grounding branch line 2 can be clamped on the grounding pile 3 through the grounding clamp, so that grounding is realized.
The length of the disconnection-preventing grounding branch line 2 is greater than that of the detection branch line 1, and the detection branch line 1 is provided with a detection circuit 11 for detecting whether the connection between the detection branch line 1 and the grounding pile 3 is disconnected. It can be understood that, because the anti-breaking grounding branch line 2 is longer than the detection branch line 1, when a field worker accidentally touches the instrument ground line and pulls the instrument ground line, or when the field worker moves the instrument and pulls the whole instrument ground line, the short detection branch line 1 is broken first, that is, the grounding clip on the detection branch line 1 is detached from the grounding pile 3, while the grounding clip on the long anti-breaking grounding branch line 2 can still be clipped on the grounding pile 3, so as to ensure the safety of the grounding state of the instrument.
In an exemplary scheme, the anti-breaking grounding branch line 2 is 25 to 35cm longer than the detection branch line 1, for example, the anti-breaking grounding branch line 2 is 30cm longer than the detection branch line 1, so that on one hand, it can be ensured that the anti-breaking grounding branch line 2 is not easily pulled and broken when a field worker accidentally touches the grounding line, and on the other hand, it can be ensured that the anti-breaking grounding branch line 2 is not too long and is not placed everywhere.
In an exemplary scheme, the detection circuit 11 includes a buzzer, and the detection circuit 11 is specifically configured to detect a resistance of a loop formed by the detection branch line 1 and the anti-breaking ground branch line 2, and when the resistance of the loop is greater than a preset resistance value, the buzzer works and gives an alarm. It can be understood that one end of the detection branch line 1 and one end of the disconnection-preventing grounding branch line 2 are both connected to the instrument, and the other end of the detection branch line 1 and the other end of the disconnection-preventing grounding branch line 2 are both connected to the grounding pile 3, so that the detection branch line 1, the disconnection-preventing grounding branch line 2 and the grounding pile 3 actually form a loop, after the detection branch line 1 is disconnected from the grounding pile 3, the loop is disconnected, and the resistance value of a certain point on the loop relatively changes, at this time, a buzzer can be triggered to work and give an alarm based on the change of the resistance value on the loop, and a worker is prompted to check the grounding state and reconnect the detection branch line 1.
Specifically, referring to fig. 2, fig. 2 is a schematic structural diagram of a detection circuit according to an embodiment of the present disclosure. The detection circuit 11 further includes: the circuit comprises a power supply, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an operational amplifier T, a comparator J and a triode Q; one end of the power supply is connected to the grounding pile 3 through a first resistor R1, and the other end of the power supply is connected to the instrument; the first input end of the operational amplifier T is connected with the grounding stub 3, the second input end of the operational amplifier T is connected to the other end of the power supply through an eighth resistor R8, the second input end of the operational amplifier T is also connected to the output end of the operational amplifier through a ninth resistor R9, the first input end of the operational amplifier T is a non-inverting input end, and the second input end of the operational amplifier T is an inverting input end; the first input end of the comparator J is connected with the output end of the operational amplifier T, the second input end of the comparator I is connected between the second resistor R2 and the tenth resistor R10, the second resistor R2 and the tenth resistor R10 are connected with a power supply in series, the tenth resistor R10 is also connected with a third resistor R3 and a fourth resistor R4 in parallel, the first input end of the comparator J is a non-inverting input end, the second input end of the comparator J is an inverting input end, and the tenth resistor R10, the third resistor R3 and the fourth resistor R4 form an equivalent resistor together to ensure the voltage of the second input end of the comparator I; the output end of the comparator is connected with the base electrode of the triode Q through a fifth resistor R5, a sixth resistor R6 is connected between the base electrode and the emitting electrode of the triode Q in series, and the collector electrode of the triode Q is connected to the other end of the power supply through the buzzer and a seventh resistor R7.
The power supply is a dc power supply, and the voltage of the dc power supply may be 3V, for example, the dc power supply may be a button battery of 3V. The point A is a point where the detection branch line 1 is connected to the grounding pile 3 through the grounding clamp, the point B is a point where the disconnection-preventing grounding branch line is connected to the grounding pile 3 through the grounding clamp, and the point C is a point where the detection branch line 1 and the disconnection-preventing grounding branch line are connected to the instrument side. The resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are respectively 1000 Ω, 200 Ω, 510 Ω, 47 Ω, 330 Ω, 100 Ω, 2000 Ω and 620 Ω.
The operating principle of the detection circuit 11 will be explained in detail below:
firstly, the resistance between point a and point B can be detected at point a, and assuming that the resistance of the ground stud 3 is R, the voltage at point a is UA ═ 3/(R1+ R) × R; since the pin of the operational amplifier 5 is connected to the point a, the voltage at the pin of the operational amplifier 5 is UA in practice. In addition, since the operational amplifier has a characteristic of zero current and other voltages, the voltages of the pins 5 and 6 of the operational amplifier are equal, and the current is 0. Therefore, a calculation formula of the pin voltage of the operational amplifier 4 can be obtained: U4/(R9+ R8) is U6/R8, and the voltage of the pin 4 of the operational amplifier is equal to the voltage of the pin 3 of the comparator J, i.e., U4 is fed to the pin 3 of the comparator J in the next stage.
The working principle of the comparator J is as follows: when the pin 2 voltage is greater than the pin 3 voltage, outputting a low level; when the voltage of the pin 2 is less than the voltage of the pin 3, high level 3V is output. Therefore, the 2-pin voltage is actually a reference voltage, and the 2-pin voltage can be preset as a fixed value, so that when the 3-pin voltage is greater than the fixed value, the comparator J can output a high level 3V, the triode Q is conducted, and the buzzer H works and gives an alarm.
Since it is explicitly indicated in the grounding regulations that the resistance of the grounding pile is within 5 Ω, that is, the resistance of the grounding pile cannot be greater than 5 Ω, when the detection branch line 1 and the disconnection-preventing grounding branch line 2 are both connected to the grounding pile 3, the loop resistance between the detection branch line 1 and the disconnection-preventing grounding branch line 2 is actually the resistance of the grounding pile 3, that is, the loop resistance between the detection branch line 1 and the disconnection-preventing grounding branch line 2 is not greater than 5 Ω. When the detection branch line 1 is disconnected from the grounding pile 3 or poor connection exists between the detection branch line 1 and the grounding pile 3, the loop resistance between the detection branch line 1 and the disconnection-preventing grounding branch line 2 is larger than 5 omega, and at the moment, the buzzer should work and give an alarm.
When the resistance R of the ground stud 3 is 5 Ω, U3 ═ U4 ═ 21 ═ UA ═ 21 ≈ 3/(1000+5) ≈ 5 ≈ 0.31V. This voltage is the reference voltage of 2 feet, and U2 ≈ 0.31V can be obtained through R2, R3, R4 and R10. At this time, U2 is approximately equal to U3, and when the resistance at point a (i.e. the loop resistance between the detection branch line 1 and the anti-breaking ground branch line 2) is greater than 5 Ω, accordingly, U3 is greater than 0.31, i.e. U3 is greater than U2, pin 1 of the comparator J outputs high level, so that the triode Q is turned on, and the buzzer H operates and gives an alarm. When the resistance at point a (i.e. the loop resistance between the detection branch line 1 and the anti-break grounding branch line 2) is less than 5 Ω, correspondingly, U3 is less than 0.31, i.e. U3 is less than U2, pin 1 of the comparator J outputs a low level, the triode Q is not turned on, and the buzzer H does not work.
Therefore, through the design of the circuit, after the detection branch line 1 is disconnected from the grounding pile 3 or when poor connection exists between the detection branch line 1 and the grounding pile 3, the buzzer works and gives an alarm to prompt a worker to check the grounding state and reconnect the detection branch line 1.
The fifth resistor R5 and the seventh resistor R7 are both used for limiting current, so as to avoid excessive current flowing through the transistor 1 and the buzzer H.
In addition, a capacitor C1 is connected in parallel to the tenth resistor R10 to filter high frequency signals and improve the accuracy of circuit operation.
Optionally, in this embodiment of the application, the detection branch line is further connected in parallel with a ground branch line, the ground branch line is connected with a two-position switch, and the two-position switch is further connected with the detection branch line; when the double-position switch is switched to the position 1, the detection branch line is conducted, and the grounding branch line is disconnected; when the two-position switch is switched to the position 2, the detection branch line is disconnected, and the grounding branch line is conducted. It can be understood that when the grounding state of the grounding wire of the detection instrument is not required, the two-position switch can be switched to the position 2, the detection branch line is disconnected, and the grounding branch line is conducted, so that the grounding wire of the instrument has two grounding points, and the grounding safety can be ensured. In addition, under some scenes with higher requirements on the grounding state, the detection branch line is disconnected, the grounding branch line is connected, the coupling influence of the electric energy of the detection branch line on the instrument can be avoided, and the normal operation of the instrument is ensured.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An instrument ground lead, comprising:
detecting branch lines and breakage-proof grounding branch lines;
the detection branch line and the anti-breaking grounding branch line are connected in parallel, one end of the detection branch line and one end of the anti-breaking grounding branch line are both connected to an instrument, and the other end of the detection branch line and the other end of the anti-breaking grounding branch line are both connected to a grounding pile;
the length of the anti-breaking grounding branch line is greater than that of the detection branch line, and a detection circuit is arranged on the detection branch line and used for detecting whether the connection between the detection branch line and the grounding pile is broken or not.
2. The instrumentation ground of claim 1, wherein the anti-disconnect ground branch line is 25 to 35cm longer than the detection branch line.
3. The instrument ground wire of claim 1, wherein the detection circuit comprises a buzzer, and the detection circuit is specifically configured to detect a resistance of a loop formed by the detection branch line and the anti-breaking ground branch line, and when the resistance of the loop is greater than a preset resistance value, the buzzer operates and gives an alarm.
4. The instrument ground of claim 3, wherein the detection circuit further comprises: the circuit comprises a power supply, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an operational amplifier T, a comparator J and a triode Q;
one end of the power supply is connected to the grounding pile through the first resistor R1, and the other end of the power supply is connected to the instrument;
the first input end of the operational amplifier T is connected with the grounding stub, the second input end of the operational amplifier T is connected to the other end of the power supply through the eighth resistor R8, the second input end of the operational amplifier T is also connected to the output end of the operational amplifier through the ninth resistor R9, the first input end of the operational amplifier T is a non-inverting input end, and the second input end of the operational amplifier T is an inverting input end;
a first input end of the comparator J is connected to an output end of the operational amplifier T, a second input end of the comparator I is connected between the second resistor R2 and the tenth resistor R10, the second resistor R2 and the tenth resistor R10 are connected in series with the power supply, the tenth resistor R10 is further connected in parallel with the third resistor R3 and the fourth resistor R4, the first input end of the comparator J is a non-inverting input end, and the second input end of the comparator J is an inverting input end;
the output end of the comparator is connected with the base electrode of the triode Q through a fifth resistor R5, a sixth resistor R6 is connected between the base electrode and the emitting electrode of the triode Q in series, and the collector electrode of the triode Q is connected to the other end of the power supply through the buzzer and the seventh resistor R7.
5. The instrument ground of claim 4 wherein a capacitor C1 is further connected in parallel to the tenth resistor R10.
6. The instrument ground of claim 4 or 5 wherein the power source is a DC power source and the voltage of the DC power source is 3V.
7. The instrumentation ground of claim 4, wherein a ground branch line is further connected in parallel to the detection branch line, and a two-position switch is connected to the ground branch line, the two-position switch being further connected to the detection branch line;
when the double-position switch is switched to the position 1, the detection branch line is conducted, and the grounding branch line is disconnected;
when the two-position switch is switched to the position 2, the detection branch line is disconnected, and the grounding branch line is conducted.
8. The instrumentation ground wire of claim 1, wherein the other end of the detection branch line and the other end of the breakage-preventing ground branch line are each clamped to a ground stud by a ground clip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920901554.7U CN210347723U (en) | 2019-06-14 | 2019-06-14 | Instrument grounding wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920901554.7U CN210347723U (en) | 2019-06-14 | 2019-06-14 | Instrument grounding wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210347723U true CN210347723U (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920901554.7U Active CN210347723U (en) | 2019-06-14 | 2019-06-14 | Instrument grounding wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210347723U (en) |
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2019
- 2019-06-14 CN CN201920901554.7U patent/CN210347723U/en active Active
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