CN218158289U - Direct current system ground fault detection device for single person operation - Google Patents
Direct current system ground fault detection device for single person operation Download PDFInfo
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- CN218158289U CN218158289U CN202222264187.9U CN202222264187U CN218158289U CN 218158289 U CN218158289 U CN 218158289U CN 202222264187 U CN202222264187 U CN 202222264187U CN 218158289 U CN218158289 U CN 218158289U
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Abstract
The utility model discloses a direct current system ground fault detection device of single operation, wherein, direct current system ground fault detection device of single operation, include: the device comprises a control unit, an alarm unit, a detection unit and a display unit; the detection unit for detecting the real-time voltage value of the direct current system of the transformer substation is connected with a bus behind a direct current screen of the direct current system of the transformer substation; the detection unit is connected with the control unit, and the control unit is connected with the display unit for displaying the real-time voltage value; the alarm unit is connected with the control unit which controls the alarm unit to give an alarm when the direct current system has a fault and controls the alarm unit to stop giving an alarm when the direct current system has a fault. The problem that when a traditional direct current system is grounded due to faults, two persons are required to operate simultaneously to detect the fault due to the fact that a direct current screen cannot normally display a grounding branch circuit, manpower is wasted, and working efficiency is reduced is solved.
Description
Technical Field
The utility model relates to an electric power engineering field, the direct current system ground fault detection device of single operation specifically says so.
Background
Each transformer substation in the power system is provided with a set of complete direct current system for providing power for transformer protection, line incoming line protection devices and the like in the transformer substation. When the 220V direct current system is in normal operation, the positive pole is connected to the ground, and the negative pole is connected to the ground at about 110V. When taking place direct current ground fault, direct current screen in the transformer substation generally can give direct current system's this moment voltage and which branch road has taken place ground connection, but some transformer substations because of direct current screen is too old, can't correctly show which branch road has taken place ground connection, to this kind of condition, need artificial the measuring. On site, two persons are generally matched to check direct current grounding, namely, one person measures the positive pole or the negative pole of the direct current screen to the ground by using a universal meter and constantly looks at the voltage value of the universal meter; and one person judges which branch direct current is in direct current idle switch and is in direct current grounding by using a pull method in front of the corresponding direct current screen.
Although the situation can find out where direct current grounding occurs, two persons check, so that manpower and time are wasted, and the working efficiency is low; two persons usually work on the site of the DC system equipment, and when the DC grounding is checked, other works cannot be synchronously carried out.
Disclosure of Invention
In view of this, the utility model provides a direct current system ground fault detection device of single operation to when solving direct current system trouble ground connection in the past, because of the unable normal ground connection branch road that shows of direct current screen, and need two people concurrent operation to detect, both wasted the manpower, reduced work efficiency's problem again.
The utility model provides a direct current system ground fault detection device of single operation, include: the device comprises a control unit, an alarm unit, a detection unit and a display unit;
the detection unit for detecting the real-time voltage value of the direct current system of the transformer substation is connected with a bus behind a direct current screen of the direct current system of the transformer substation;
the detection unit is connected with the control unit, and the control unit is connected with the display unit for displaying the real-time voltage value;
the alarm unit is connected with the control unit which controls the alarm unit to give an alarm when the direct current system has a fault and controls the alarm unit to stop giving an alarm when the direct current system has a fault.
Preferably, the control unit includes: the system comprises a singlechip, a miniature air switch and a battery;
the battery, the detection unit and the display unit are respectively connected with the single chip microcomputer which processes the real-time voltage value detected by the detection unit and then transmits the processed real-time voltage value to the display unit for displaying;
one end of the miniature air switch is connected with the detection unit, the other end of the miniature air switch is connected with the alarm unit, and the miniature air switch is in a closed state in an initial state.
Preferably, the alarm unit includes: a buzzer;
one end of the triode of the buzzer is grounded, and the other two ends of the triode of the buzzer are connected with the detection unit.
Preferably, the detection unit includes: a voltage sensor;
and the positive and negative wiring ports of the voltage sensor are respectively connected with the bus and the control unit.
Preferably, the display unit includes: displaying the nixie tube;
and an anode pin of the display nixie tube is connected with the control unit.
The utility model discloses following beneficial effect has:
the utility model provides a direct current system ground fault detection device for single operation, which is provided with a detection unit to detect the real-time voltage value of a bus behind a direct current screen; when the system has ground fault, the alarm unit automatically gives an alarm, and when the fault is relieved, the alarm unit is automatically controlled by the control unit to relieve the alarm, so that the detection operation behind the direct current screen does not need personnel to be matched, a single person can complete all detection operations, the labor cost is reduced, and the working efficiency is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a connection block diagram of the dc system ground fault detection device of the embodiment of the present invention for single person operation.
Fig. 2 is a schematic structural diagram of the dc system ground fault detection device for single person operation according to the embodiment of the present invention.
Fig. 3 is a circuit diagram of the dc system ground fault detection device for single person operation according to the embodiment of the present invention.
In the figure, 1-display nixie tube, 2-bus connecting circuit, 3-voltage sensor, 4-micro air switch, 5-single chip microcomputer and 6-buzzer.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, for parts not described in detail, those skilled in the art can fully understand the present invention.
Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a connection block diagram of the dc system ground fault detection device of the embodiment of the present invention for single person operation. Fig. 2 is a schematic structural diagram of the dc system ground fault detection device for single person operation according to the embodiment of the present invention. Fig. 3 is a circuit diagram of the dc system ground fault detection device for single person operation according to the embodiment of the present invention. As shown in fig. 1, 2 and 3, a dc system ground fault detection device for single person operation includes: the device comprises a control unit, an alarm unit, a detection unit and a display unit; the detection unit for detecting the real-time voltage value of the direct current system of the transformer substation is connected with a bus behind a direct current screen of the direct current system of the transformer substation; the detection unit is connected with the control unit, and the control unit is connected with the display unit for displaying the real-time voltage value; the alarm unit is connected with the control unit which controls the alarm unit to give an alarm when the direct current system has a fault and controls the alarm unit to stop giving an alarm when the direct current system has a fault.
The embodiment of the utility model provides an in, when direct current system breaks down, with the bus connection behind the direct current screen among detecting element and the direct current system, connect the completion back, the real-time voltage value on the bus this moment of detecting element detection to give the control unit, the control unit sends the display element after handling received real-time voltage value signal and shows.
Normally, the real-time voltage value of the bus is about 110V, and when a certain line in the direct current system is grounded due to a fault, the real-time voltage value of the bus is about 10V. And if the real-time voltage value received by the control unit is less than 90V, the alarm unit gives an alarm.
During detection, an operator sequentially disconnects the air switches corresponding to all the branches in front of the direct-current screen through a pull method, when a certain disconnected air switch is the air switch corresponding to a fault line, the direct-current system recovers to be normal, and the real-time voltage value of the bus is between +90V and + 120V. The detection unit transmits the detected normal recovery real-time voltage to the control unit, and the control unit controls the alarm unit to stop alarming.
In the present invention, the control unit includes: the system comprises a singlechip 5, a miniature air switch 4 and a battery; the battery, the detection unit and the display unit are respectively connected with the singlechip 5 which processes the real-time voltage value detected by the detection unit and then transmits the processed real-time voltage value to the display unit for displaying; one end of the miniature air switch 4 is connected with the detection unit, the other end of the miniature air switch is connected with the alarm unit, and the miniature air switch 4 is in a closed state in an initial state.
The embodiment of the utility model provides an in, singlechip 5 adopts AT89C51 type singlechip 5, and singlechip 5 connects battery and detecting element respectively, and the electric current of battery passes through singlechip 5 to transmit for detecting element to supply power for detecting element.
After detecting element and bus connection, detecting element detection bus's real-time voltage value to transmit singlechip 5, behind the real-time voltage value of singlechip 5 receipt, convert the signal of telecommunication that display element can carry out the demonstration with its processing, and transmit display element, demonstrate real-time voltage value through display element.
Meanwhile, after passing through the detection unit, the bus current is transmitted to the micro air switch 4 through the detection unit, and when the direct-current system is in a fault state, the bus voltage value is about 10V, the current value is very small, the rated current for tripping the micro air switch 4 is not achieved, and the micro air switch 4 cannot be disconnected; the current is transmitted to the alarm unit through the miniature air switch 4, and the alarm unit gives an alarm after receiving the current. The micro air switch 4 is a bipolar input type air switch, and the rated current is +20A.
During detection, when an operator disconnects the air switch corresponding to a fault line in front of the direct current screen, the direct current system recovers to normal, the voltage value of the bus is increased to be more than +90V, the bus current is transmitted to the micro air switch 4 through the detection unit, the current value at the moment is far more than +20A, the tripping rated current of the micro air switch 4 is reached, the micro air switch 4 is disconnected, and the alarm unit stops alarming when detecting that no current is input.
The utility model discloses in, alarm unit includes: a buzzer 6; one end of a triode of the buzzer 6 is grounded, and the other two ends of the triode are connected with the detection unit.
In the embodiment of the utility model provides an in, a pin ground connection of bee calling organ 6, two other pins are connected with the positive negative pole that corresponds on miniature sky division 4 respectively.
Because the initial state of the miniature air switch 4 is a closed state, when the system is detected, if the system has a fault, the voltage value on the bus is about 10V, current is transmitted to the buzzer 6 after passing through the detection unit and the miniature air switch 4 from the bus, the buzzer 6 starts to alarm after being electrified, and at the moment, an operator in front of the direct current screen can know that the fault of the direct current system still exists at present.
When an operator opens the fault line before disconnecting the direct current screen, the direct current system is recovered to be normal, the voltage value on the bus is recovered to be more than +90V, when the bus current reaches the micro air switch 4 through the detection unit, the micro air switch 4 trips because the rated tripping current of the micro air switch 4 is reached, the buzzer 6 stops alarming because no current is input, and the operator before the direct current screen can know that the line corresponding to the currently disconnected air switch is the fault line.
In the present invention, the detection unit includes: a voltage sensor 3; and the positive and negative wiring ports of the voltage sensor 3 are respectively connected with the bus and the control unit.
The embodiment of the utility model provides an in, voltage sensor 3 just, negative pole wiring port is connected with singlechip 5 and miniature empty 4 of opening respectively. During the test, with bus connection behind voltage sensor 3 and the direct current screen through bus connection line 2, voltage sensor 3 detects the real-time voltage value of bus and transmits for singlechip 5, and singlechip 5 transmits the display element after changing real-time voltage value and shows. At the same time, the current of the bus is transmitted to the micro air switch 4 through the voltage sensor 3.
The utility model discloses in, the display element includes: displaying the nixie tube 1; and an anode pin of the display nixie tube 1 is connected with the control unit.
The embodiment of the utility model provides an in, show that 1 positive pole pin of charactron is connected with singlechip 5, after singlechip 5 received the real-time voltage value that voltage sensor 3 detected, convert it into the signal that shows that charactron 1 can show, demonstrate real-time voltage value through showing charactron 1, make things convenient for operating personnel to look over the voltage.
The embodiment of the utility model provides an in, when direct current system broke down, with bus connection behind voltage sensor 3 and the direct current screen, if there is the trouble in the system, the magnitude of voltage on the bus is about 10V, and the electric current is followed the bus and is passed through voltage sensor 3 and miniature empty 4 backs of opening, transmits to bee calling organ 6, begins to report to the police after bee calling organ 6 circular telegram. An operator sequentially disconnects the idle switches corresponding to each branch in front of the direct-current screen through a pull method, when a certain disconnected idle switch is an idle switch corresponding to a fault line, the direct-current system recovers to be normal, and the real-time voltage value of the bus is between +90V and +120V at the moment. The current is transmitted to the miniature air switch 4 through the voltage sensor 3, at the moment, the current reaches the tripping rated current of the miniature air switch 4, the miniature air switch 4 is switched off, the buzzer 6 stops alarming due to no current input, an operator in front of the direct current screen can know that the line corresponding to the currently switched off air switch is a fault line. After bus current got into voltage sensor 3, voltage sensor 3 detected bus's real-time voltage value and transmitted singlechip 5, and singlechip 5 converts real-time voltage value into the signal that shows that charactron 1 can show to transmit and show that charactron 1 shows, thereby make things convenient for maintenance personal to look over this moment whether bus voltage value resumes normally.
The utility model has simple structure, low manufacturing cost and simple and convenient use and operation, does not need to control the alarm through the singlechip 5, and directly controls the micro air switch 4 to cut off the alarm through the current change of the bus; the utility model discloses need two people to cooperate when can effectively solving the direct current system ground fault inspection of transformer substation, increased the cost of labor, prolonged operating time, lead to the problem that work efficiency is low. Need not to use complicated instrument and equipment, only through voltage sensor 3, miniature sky open 4 and the cooperation of bee calling organ 6, report to the police when there is the trouble in the circuit, stop reporting to the police when the trouble is relieved to the circuit, can make the maintenance personal before the direct current screen select the trouble circuit fast, improved work efficiency greatly, make the transformer substation personnel divide the worker more reasonable.
The above-mentioned embodiments are merely embodiments for expressing the 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 those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. A DC system ground fault detection device of single operation which characterized in that includes: the device comprises a control unit, an alarm unit, a detection unit and a display unit;
the detection unit for detecting the real-time voltage value of the direct current system of the transformer substation is connected with a bus behind a direct current screen of the direct current system of the transformer substation;
the detection unit is connected with the control unit, and the control unit is connected with the display unit for displaying the real-time voltage value;
the alarm unit is connected with the control unit which controls the alarm unit to give an alarm when the direct current system has a fault and controls the alarm unit to stop giving an alarm when the direct current system has a fault.
2. The single-person operated dc system ground fault detection device of claim 1, wherein said control unit comprises: the device comprises a singlechip (5), a miniature air switch (4) and a battery;
the battery, the detection unit and the display unit are respectively connected with the single chip microcomputer (5) which processes the real-time voltage value detected by the detection unit and then transmits the processed real-time voltage value to the display unit for displaying;
one end of the miniature air switch (4) is connected with the detection unit, the other end of the miniature air switch is connected with the alarm unit, and the miniature air switch (4) is in a closed state in an initial state.
3. The single-person operated dc system ground fault detection device of claim 1, wherein said alarm unit comprises: a buzzer (6);
one end of a triode of the buzzer (6) is grounded, and the other two ends of the triode are connected with the detection unit.
4. The single-person operated dc system ground fault detection device of claim 1, wherein said detection unit comprises: a voltage sensor (3);
and the positive and negative wiring ports of the voltage sensor (3) are respectively connected with the bus and the control unit.
5. The single-person operated direct current system ground fault detection device according to any one of claims 1 to 4, wherein said display unit comprises: a display nixie tube (1);
and an anode pin of the display nixie tube (1) is connected with the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222264187.9U CN218158289U (en) | 2022-08-27 | 2022-08-27 | Direct current system ground fault detection device for single person operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222264187.9U CN218158289U (en) | 2022-08-27 | 2022-08-27 | Direct current system ground fault detection device for single person operation |
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| Publication Number | Publication Date |
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| CN218158289U true CN218158289U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222264187.9U Active CN218158289U (en) | 2022-08-27 | 2022-08-27 | Direct current system ground fault detection device for single person operation |
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| CN (1) | CN218158289U (en) |
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- 2022-08-27 CN CN202222264187.9U patent/CN218158289U/en active Active
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