CN212569081U - Current-limiting short circuit applied to secondary signal checking - Google Patents
Current-limiting short circuit applied to secondary signal checking Download PDFInfo
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- CN212569081U CN212569081U CN202020417461.XU CN202020417461U CN212569081U CN 212569081 U CN212569081 U CN 212569081U CN 202020417461 U CN202020417461 U CN 202020417461U CN 212569081 U CN212569081 U CN 212569081U
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Abstract
The utility model provides a current-limiting short-circuit line applied to secondary signal checking, which comprises a short-circuit line front end, a current-limiting loop, a current-limiting resistance adjusting device and a short-circuit line rear end; the current limiting loop comprises a positive end interface and a negative end interface, the positive end interface is connected with the front end of the short connecting wire, and the negative end interface is connected with the rear end of the short connecting wire; the current-limiting resistance adjusting device is arranged in the middle of the current-limiting loop; when the secondary signal is checked, the front end of the short-circuit wire is connected to the positive power supply terminal of the signal, and the rear end of the short-circuit wire is connected to the signal open-close terminal; the system also comprises a measurement and control device, wherein an optocoupler diode is arranged in the measurement and control device, a signal input terminal is connected with the cathode of the optocoupler diode, and the anode of the optocoupler diode is connected with a signal negative power supply terminal; the current-limiting resistance adjusting device comprises a selector switch and a first resistor, a second resistor and a third resistor. By applying the technical scheme, reliable signal transmission can be ensured, and meanwhile, the related direct current air switch can be prevented from tripping when direct current positive and negative electricity are in short circuit by mistake.
Description
Technical Field
The utility model relates to an electric power system overhauls the field, specifically indicates a current-limiting short-circuit line that is applied to secondary signal and checks.
Background
In order to ensure the reliable operation of the power system, the power failure inspection of the related secondary equipment of the transformer substation and the loop thereof needs to be carried out regularly, so that the potential safety hazard is eliminated. At present, the mode of realizing signal transmission in a transformer substation is realized by a traditional secondary cable analog input measurement and control device, and as secondary equipment and loops thereof are complex and related secondary signals needing real-time monitoring are more, secondary signal checking becomes one of the most common routine work in daily power failure detection of a power system.
In the process of checking secondary signals, because many signals cannot be actually simulated in a conventional operation mode, a terminal block short-circuiting method is often adopted by maintainers, namely, the positive end of a signal loop and the measurement and control open-close end are short-circuited at an outdoor terminal box or a convergence control cabinet to simulate the actual hard-contact action, so that the signal transmission with a main station is realized. The method has great safety risk, because the terminal box or the control cubicle not only has a signal power supply, but also comprises a switch operation power supply, a switch motor power supply, an indicator light power supply and other direct current power supplies, if an maintainer mistakenly short-circuits the positive end of the signal power supply with the negative end of any direct current power supply, two paths of idle switches are tripped simultaneously, great impact damage can be caused to the idle switch body and secondary equipment, and if the idle switch is tripped more than grade, major safety accidents such as power failure of a total station protection device, disconnection of a switch operation circuit and the like can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to current-limiting short-circuit line that secondary signal checked realizes guaranteeing that the reliable transmission of signal can guarantee again simultaneously that the direct current is just, when the short circuit of negative electricity mistake does not trip to the relevant direct current empty switch.
In order to solve the technical problem, the utility model provides a current-limiting short-circuit line applied to secondary signal checking, which comprises a short-circuit line front end, a current-limiting loop, a current-limiting resistance adjusting device and a short-circuit line rear end; the current limiting loop comprises a positive end interface and a negative end interface, the positive end interface is connected with the front end of the short connecting wire, and the negative end interface is connected with the rear end of the short connecting wire; the current-limiting resistance adjusting device is arranged in the middle of the current-limiting loop; when the secondary signal is checked, the front end of the short-circuit wire is connected to the positive power supply terminal of the signal, and the rear end of the short-circuit wire is connected to the signal open-close terminal; the device also comprises a measurement and control device, wherein an optocoupler diode is arranged in the measurement and control device, the signal input terminal is connected with the negative electrode of the optocoupler diode, and the positive electrode of the optocoupler diode is connected with a signal negative power supply terminal; the current-limiting resistance adjusting device comprises a selector switch and a first resistor, a second resistor and a third resistor; and the first resistor, the second resistor or the third resistor is selected to be connected into the current limiting loop through a selector switch.
In a preferred embodiment, the first resistor, the second resistor and the third resistor have different resistances.
In a preferred embodiment, the current limiting circuit includes a first transistor and a second transistor; the collector of the first triode is connected with the base of the first triode and is used as a positive terminal interface to be connected with the front end of the short connecting wire; the emitting set of the first triode is connected with the base of the second triode and is connected with one end of the change-over switch, the other end of the change-over switch is connected with the emitting set of the second triode, and the collecting electrode of the second triode is connected with the base of the first triode.
In a preferred embodiment, a fourth resistor is further connected between the base and the collector of the first triode.
In a preferred embodiment, the current flows from the signal positive power supply terminal to the signal negative power supply terminal through the current limiting loop and the optocoupler diode inside the measurement and control device, and the optocoupler diode is conducted.
In a preferred embodiment, the switch is connected with a current-limiting resistance adjusting handle.
In a preferred embodiment, the first and second transistors are npn transistors.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model provides a be applied to current-limiting short-circuit that secondary signal checked, for realizing the sensitivity of signal, reliable transmission, measuring and control device requires that the opto-coupler to open the electric current big better more, and different spaced direct current do not open the tripping current value completely the same, according to being examined the related direct current of interval and open the tripping current and come the manual first resistance of selection, second resistance or third resistance, make the return circuit guarantee just, negative terminal mistake short circuit does not cause the empty tripping operation after and can ensure again to observe and control the opto-coupler and open and have sufficient electric current. The utility model discloses increased current-limiting resistance switching function in the current-limiting return circuit, made it guarantee that the signal reliably transmits while can guarantee again that the direct current is just, the empty tripping operation of switching on of relevant direct current when the negative electricity mistake short circuit.
Drawings
Fig. 1 is a schematic connection diagram of a current-limiting short circuit applied to secondary signal verification in a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of a current limiting circuit according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
A current-limiting short-circuit applied to secondary signal checking, referring to fig. 1 to 2, comprises a short-circuit front end 7, a current-limiting loop 8, a current-limiting resistance adjusting device, a short-circuit back end 10; the current limiting loop 8 comprises a positive end interface and a negative end interface, the positive end interface is connected with the front end 7 of the short-circuit wire, and the negative end interface is connected with the rear end 10 of the short-circuit wire; the current-limiting resistance adjusting device is arranged in the middle of the current-limiting loop 8; when the secondary signal is checked, the front end 7 of the short-circuit wire is connected to the positive power supply terminal 5 of the signal, and the rear end 10 of the short-circuit wire is connected to the signal open-close terminal 4; the device is characterized by further comprising a measurement and control device 1, wherein an optocoupler diode 2 is arranged in the measurement and control device 1, the signal input terminal 4 is connected with the negative electrode of the optocoupler diode 2, and the positive electrode of the optocoupler diode 2 is connected with a signal negative power supply terminal 3; the current-limiting resistance adjusting device comprises a change-over switch S1 and a first resistor R2, a second resistor R3 and a third resistor R4; the first resistor R2, the second resistor R3 or the third resistor R4 is selected to be connected into the current limiting loop 8 through a switch S1. Specifically, the first resistor R2, the second resistor R3 and the third resistor R4 have different resistances. During the time checking of the secondary signal, connect short-circuit connection front end 7 in signal positive power supply terminal 5 department, short-circuit connection rear end 10 is connected in signal open-end terminal 4 department, come the closure of simulation hard contact, the electric current flows in signal negative power supply terminal 3 through current-limiting circuit 8 and measuring and control device 1 inside opto-coupler diode 2 from signal positive power supply terminal 5 this moment, opto-coupler diode 2 switches on the back signal and sends the dispatch, for the sensitivity of guaranteeing to send on the signal, it is as big as possible to require the conduction current.
The current limiting loop 8 comprises a first triode Q1 and a second triode Q2; the collector of the first transistor Q1 is connected to the base of the first transistor Q1 and is connected as a positive terminal interface to the shorting stub front end 7; the emitting set of the first triode Q1 is connected with the base of the second triode Q2 and connected with one end of the switch S1, the other end of the switch S1 is connected with the emitting set of the second triode Q2, and the collector of the second triode Q2 is connected with the base of the first triode Q1. A fourth resistor R1 is connected between the base and the collector of the first triode Q1. One end of the first resistor R2, one end of the second resistor R3, and one end of the third resistor R4 are respectively connected to pins 4, 5, and 6 of the switch S1S 1, and the other end is connected in parallel to the transmitter of the second transistor Q2 and to the "-" end of the loop, and the connection point of the switch S1 is selectively controlled by the rotating handle of the current-limiting resistor, in this embodiment, the first transistor Q1 and the second transistor Q2 are npn transistors. In order to switch the current limiting resistors such as the first resistor R2, the second resistor R3 and the third resistor R4, the switch S1 is connected to a current limiting resistor adjusting handle 9.
The utility model provides a be applied to current-limiting short-circuit that secondary signal checked, for realizing the sensitivity of signal, reliable transmission, measuring and control device 1 requires the opto-coupler to open the electric current the big better more, and different spaced direct current do not open the tripping current value completely the same, according to being examined the related direct current of interval and open the tripping current and come the manual first resistance R2 of selection, second resistance R3 or third resistance R4, make the return circuit guarantee just at the assurance power, negative terminal mistake short circuit does not cause the empty time of opening the tripping operation after can ensure again to observe and control the opto-coupler and open and have sufficient electric current. The utility model discloses increased current-limiting resistance switching function in current-limiting return circuit 8, made it guarantee again can guarantee direct current positive, negative electricity when mistake short circuit that the relevant direct current air switch does not trip when guaranteeing that the reliable transmission of signal.
The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.
Claims (7)
1. A current-limiting short-circuit line applied to secondary signal checking is characterized by comprising a short-circuit line front end, a current-limiting loop, a current-limiting resistance adjusting device and a short-circuit line rear end; the current limiting loop comprises a positive end interface and a negative end interface, the positive end interface is connected with the front end of the short connecting wire, and the negative end interface is connected with the rear end of the short connecting wire; the current-limiting resistance adjusting device is arranged in the middle of the current-limiting loop; when the secondary signal is checked, the front end of the short-circuit wire is connected to the positive power supply terminal of the signal, and the rear end of the short-circuit wire is connected to the signal open-close terminal; the device also comprises a measurement and control device, wherein an optocoupler diode is arranged in the measurement and control device, the signal input terminal is connected with the negative electrode of the optocoupler diode, and the positive electrode of the optocoupler diode is connected with a signal negative power supply terminal; the current-limiting resistance adjusting device comprises a selector switch and a first resistor, a second resistor and a third resistor; and the first resistor, the second resistor or the third resistor is selected to be connected into the current limiting loop through a selector switch.
2. The current-limiting shorting bar for secondary signal verification as claimed in claim 1, wherein the first, second and third resistors have different resistances.
3. The current-limiting shorting circuit for secondary signal verification as claimed in claim 2, wherein the current-limiting circuit comprises a first transistor, a second transistor; the collector of the first triode is connected with the base of the first triode and is used as a positive terminal interface to be connected with the front end of the short connecting wire; the emitting set of the first triode is connected with the base of the second triode and is connected with one end of the change-over switch, the other end of the change-over switch is connected with the emitting set of the second triode, and the collecting electrode of the second triode is connected with the base of the first triode.
4. The current-limiting shorting stub for secondary signal matching as claimed in claim 3, wherein a fourth resistor is further connected between the base and the collector of the first transistor.
5. A current-limiting short circuit for secondary signal verification as claimed in any one of claims 3 to 4, wherein current flows from the positive signal power supply terminal to the negative signal power supply terminal through the current-limiting loop and the optocoupler diode inside the measurement and control device, the optocoupler diode being turned on.
6. The current-limiting short circuit for secondary signal verification as claimed in claim 5, wherein a current-limiting resistor adjusting handle is connected to the switch.
7. The current-limiting shorting bar for secondary signal verification as claimed in claim 5, wherein the first and second transistors are npn transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020417461.XU CN212569081U (en) | 2020-03-27 | 2020-03-27 | Current-limiting short circuit applied to secondary signal checking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020417461.XU CN212569081U (en) | 2020-03-27 | 2020-03-27 | Current-limiting short circuit applied to secondary signal checking |
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| Publication Number | Publication Date |
|---|---|
| CN212569081U true CN212569081U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020417461.XU Active CN212569081U (en) | 2020-03-27 | 2020-03-27 | Current-limiting short circuit applied to secondary signal checking |
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| Country | Link |
|---|---|
| CN (1) | CN212569081U (en) |
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2020
- 2020-03-27 CN CN202020417461.XU patent/CN212569081U/en active Active
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