CN212391594U - Low-voltage direct-current system grounding polarity indicating device - Google Patents
Low-voltage direct-current system grounding polarity indicating device Download PDFInfo
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- CN212391594U CN212391594U CN202020207899.5U CN202020207899U CN212391594U CN 212391594 U CN212391594 U CN 212391594U CN 202020207899 U CN202020207899 U CN 202020207899U CN 212391594 U CN212391594 U CN 212391594U
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Abstract
The utility model relates to a low pressure direct current system ground connection polarity indicating device, including three patchcord plug P +, P-, J, nine diode D +, D-, D1, D2, D11, D12, D21, D22, D23, three resistance R, R +, R-, two triode T1, T2, a high sensitivity green emitting diode LED1, a high sensitivity red emitting diode LED2 and power E1, above-mentioned part can constitute the detection indicating circuit who is used for detecting low pressure direct current system positive pole or negative ground connection. The utility model discloses constitute by microelectronic device, with low costs, easy operation is convenient, can effectively solve the difficult seeking of polarity behind the low pressure direct current system ground connection, avoids the risk of operation equipment tripping operation simultaneously.
Description
Technical Field
The utility model relates to a direct current system equipment maintenance technical field, in particular to low pressure direct current system ground connection polarity indicating device.
Background
The power industry is the aorta of modern civilization, and the development of the power industry plays an irreplaceable and important role in civilization and progress of the whole world.
In the power industry, when a power system device fails, the failure needs to be quickly removed to ensure the continuous operation of the device without the failure. The low voltage dc system is a reliable operational, controlled energy source that ensures the removal of these faults. When the high-voltage power transmission switch is tripped due to the occurrence of grounding or short-circuit faults of the operation and control energy sources, large-area customer power failure or high-price equipment damage can be caused due to the fact that the switch is refused to move in the fault, and immeasurable loss is brought to the economic, property and life safety of people. In order to ensure safe and stable operation of electric power, a protection power supply of electric power equipment must be reliable, and the ground fault needs to be eliminated in time.
When the low-voltage direct current system is grounded, the low-voltage direct current system needs to be searched in time. The existing searching equipment is complex in structure and complex in operation and is not easy to find, a method of pulling a path for searching and sectional processing is needed according to a normal grounding searching method, searching is carried out by using a method which takes a signal and lighting part firstly, an operating part secondly, an outdoor part firstly and an indoor part secondly as principles, and searching can be carried out only by corresponding to one-time power failure of high-voltage equipment seriously, so that the normal operation and power supply of a power grid are greatly influenced. Therefore, a dc grounding searching apparatus with simple and reliable structure, easy learning and use, convenient operation, and higher safety and reliability is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the difficult problem of seeking of polarity behind the current low pressure direct current system ground connection, provide a low pressure direct current system ground connection polarity indicating device.
The utility model adopts the technical proposal that:
a low-voltage direct-current system grounding polarity indicating device comprises three flexible wire plugs P +, P-, J, nine diodes D +, D-, D1, D2, D11, D12, D21, D22, D23, three resistors R, R +, R-, two triodes T1, T2, a high-sensitivity green light-emitting diode LED1, a high-sensitivity red light-emitting diode LED2 and a power supply E1, wherein the components can form a detection indicating circuit for detecting the grounding of the positive pole or the negative pole of a low-voltage direct-current system; the detection indicating circuit is divided into a non-grounding loop, an anode grounding loop and a cathode grounding loop, wherein the non-grounding loop is formed by sequentially connecting a flexible wire plug P +, a diode D +, a resistor R-, a diode D-and a flexible wire plug P-in series; the positive grounding loop is formed by connecting a power supply E1, a resistor R, a triode T1 and a high-sensitivity green light emitting diode LED1 in series and then connecting the power supply E1, the resistor R, the triode T1 and the high-sensitivity green light emitting diode LED1 with a flexible wire plug J through a diode D2, and the triode T1 is connected with a non-grounding loop through diodes D11 and D12; the negative electrode grounding loop is formed by connecting a power supply E1, a resistor R, a triode T2 and a high-sensitivity red light emitting diode LED2 in series and then connecting the circuit with a non-grounding loop through a diode D1, and the triode T2 is connected with a flexible wire plug J through diodes D21 and D22.
And a safety resistor R0 which plays a role in protecting a human body is also arranged between the diode D2 and the cord plug J.
And a clip is arranged on the flexible wire plug J.
The utility model has the advantages that:
the polarity indicating device is composed of microelectronic devices, is low in cost and simple and convenient to operate, can effectively solve the problem that the polarity is difficult to find after a low-voltage direct-current system is grounded, and meanwhile avoids the risk of tripping operation of operating equipment.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a positive ground loop;
fig. 3 is a schematic diagram of a negative ground circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of 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 in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
As shown in fig. 1, the utility model relates to a low voltage dc system grounding polarity indicating device, which comprises three flexible wire plugs P +, P-, J; nine diodes D +, D-, D1, D2, D11, D12, D21, D22 and D23, wherein the diodes D +, D-and D23 can be selected from diodes with the model number of 1N4007, the diodes D1 and D2 can be selected from diodes with the model number of 1N4148, the voltage drop of the diode D23 is 0.7V, and the sensitivity indication of grounding the anode or the cathode is the same; the three resistors R, R + and R-can be five-color ring metal ring resistors with the resistance value of 10M omega and the resistance value of 100M omega; the triodes T1 and T2, the triodes T1 and T2 can be selected from the triodes with the model number of 8050; a high-sensitivity green light emitting diode LED1, operating at a voltage of 2.5V; a high-sensitivity red light emitting diode LED2, operating at a voltage of 1.8V; and a power supply E1, wherein the power supply E1 can adopt 18650 rechargeable lithium batteries with the voltage of 3V. The components can form a detection indicating circuit for detecting the grounding of the anode or the cathode of the low-voltage direct current system. The detection indicating circuit is divided into a non-grounding loop, a positive grounding loop and a negative grounding loop.
The non-grounding loop is formed by sequentially connecting a flexible wire plug P +, a diode D +, a resistor R-, a diode D-and a flexible wire plug P-in series. When the device works, the flexible wire plug P + is connected to the positive pole of the low-voltage direct-current bus, the flexible wire plug P-is connected to the negative pole of the low-voltage direct-current bus, and the flexible wire plug J is connected to the ground or the grounding part of the measurement screen cabinet. Normally the O point to ground voltage is zero. There is no voltage difference between the two transistors T1, T2, and neither of the high-sensitivity LEDs LED1, LED2 emits light.
As shown in fig. 2, the positive ground loop is formed by connecting a power supply E1, a resistor R, a transistor T1, and a high-sensitivity green light emitting diode LED1 in series, and then connecting the diode D2 to a flexible wire plug J, and the transistor T1 is connected to a non-ground loop through diodes D11 and D12.
When the device works, the flexible wire plug P + is connected to the positive pole of the low-voltage direct-current bus, the flexible wire plug P-is connected to the negative pole of the low-voltage direct-current bus, and the flexible wire plug J is connected to the ground or the grounding part of the measurement screen cabinet. When the positive electrode of the low-voltage direct-current bus is grounded, the voltage of the flexible wire plug P + to the ground is reduced, the voltage of the point O to the ground becomes a positive value, the voltage of each of the diodes D11 and D12 can be reduced by 2.5V, the effect of improving the voltage value indicating the grounding between the point O and the flexible wire plug J is achieved, the voltage of the high-sensitivity green light-emitting diode LED1 is reduced to 2.5V, the Vbe voltage of the triode T1 is reduced to 0.6V, the voltage of the diode D2 is reduced to 0.6V, and the total voltage is 8.7V. When the voltage is higher than 2.3V, the high-sensitivity green LED1 emits green light, indicating that the dc system anode is grounded.
As shown in fig. 3, the negative ground loop is formed by connecting a power source E1, a resistor R, a transistor T2, and a high-sensitivity red light emitting diode LED2 in series, and then connecting the circuit with a non-ground loop through a diode D1, and the transistor T2 is connected with a flexible cord plug J through diodes D21 and D22.
When the device works, the flexible wire plug P + is connected to the positive pole of the low-voltage direct-current bus, the flexible wire plug P-is connected to the negative pole of the low-voltage direct-current bus, and the flexible wire plug J is connected to the ground or the grounding part of the measurement screen cabinet. When the negative electrode of the low-voltage direct-current bus is grounded, the voltage of a flexible wire plug P-to-ground is increased, the voltage of an O point becomes a negative value, the voltage of each of the diodes D21 and D22 drops by 2.5V, the effect of increasing the voltage value indicating grounding between the O point and the J point is achieved, the voltage drop of the high-sensitivity red light-emitting diode LED2 is 1.8V, the Vbe voltage drop of the triode T2 is 0.6V, the voltage drop of the diode D1 is 0.6V, and the voltage drop of the diode D23 is 0.7V, wherein the total voltage is 8.7V. When the voltage is higher than 3.2V, the high-sensitivity red light emitting diode LED2 emits red light, indicating that the negative electrode of the dc system is grounded.
In order to make the polarity indicating device safer to use and operate, a safety resistor R0 which has a protection effect on a human body can be additionally arranged between the diode D2 and the cord plug J, and the resistance value of the safety resistor R0 is 10M omega.
In addition, in order to facilitate the installation of the cord plug J at the grounding position of the measurement cabinet, a clip which is convenient to clip at the grounding position of the measurement cabinet can be additionally arranged on the cord plug J.
Claims (3)
1. The utility model provides a low pressure direct current system ground connection polarity indicating device which characterized in that: the polarity indicating device comprises three flexible wire plugs P +, P-, J, nine diodes D +, D-, D1, D2, D11, D12, D21, D22, D23, three resistors R, R +, R-, two triodes T1, T2, a high-sensitivity green light-emitting diode LED1, a high-sensitivity red light-emitting diode LED2 and a power supply E1, wherein the three flexible wire plugs P +, P-, J, nine diodes D +, D-, D1, D2, three resistors D R, R +, R-, two triodes T1, T2, a high-sensitivity green light-emitting diode LED1, a high-; the detection indicating circuit is divided into a non-grounding loop, an anode grounding loop and a cathode grounding loop, wherein the non-grounding loop is formed by sequentially connecting a flexible wire plug P +, a diode D +, a resistor R-, a diode D-and a flexible wire plug P-in series; the positive grounding loop is formed by connecting a power supply E1, a resistor R, a triode T1 and a high-sensitivity green light emitting diode LED1 in series and then connecting the power supply E1, the resistor R, the triode T1 and the high-sensitivity green light emitting diode LED1 with a flexible wire plug J through a diode D2, and the triode T1 is connected with a non-grounding loop through diodes D11 and D12; the negative electrode grounding loop is formed by connecting a power supply E1, a resistor R, a triode T2 and a high-sensitivity red light emitting diode LED2 in series and then connecting the circuit with a non-grounding loop through a diode D1, and the triode T2 is connected with a flexible wire plug J through diodes D21 and D22.
2. The polarity indicating device of claim 1, wherein: and a safety resistor R0 which plays a role in protecting a human body is also arranged between the diode D2 and the cord plug J.
3. A polarity indicating device according to claim 1 or 2, wherein: and a clip is arranged on the flexible wire plug J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020207899.5U CN212391594U (en) | 2020-02-25 | 2020-02-25 | Low-voltage direct-current system grounding polarity indicating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020207899.5U CN212391594U (en) | 2020-02-25 | 2020-02-25 | Low-voltage direct-current system grounding polarity indicating device |
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| Publication Number | Publication Date |
|---|---|
| CN212391594U true CN212391594U (en) | 2021-01-22 |
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| CN202020207899.5U Active CN212391594U (en) | 2020-02-25 | 2020-02-25 | Low-voltage direct-current system grounding polarity indicating device |
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| CN (1) | CN212391594U (en) |
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- 2020-02-25 CN CN202020207899.5U patent/CN212391594U/en active Active
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