CN209860586U - Low-current grounding line selection relay - Google Patents
Low-current grounding line selection relay Download PDFInfo
- Publication number
- CN209860586U CN209860586U CN201920455553.4U CN201920455553U CN209860586U CN 209860586 U CN209860586 U CN 209860586U CN 201920455553 U CN201920455553 U CN 201920455553U CN 209860586 U CN209860586 U CN 209860586U
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- comparison processing
- processing circuit
- relay
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Abstract
The utility model relates to a small current grounding line selection relay, which comprises a shell, wherein a display screen, a wiring terminal row, an operation button, a power switch and a reset button are arranged on the front panel of the shell; a circuit board is arranged in the shell and comprises a signal receiving circuit, a comparison processing circuit and a signal output circuit which are connected in sequence, and the comparison processing circuit is also connected with a liquid crystal display driving circuit; the display screen is connected to the liquid crystal display driving circuit, the wiring terminals are respectively connected with the signal receiving circuit or the signal output circuit, and the reset keys are connected to the comparison processing circuit. The utility model discloses the arc suppression coil of relay and transformer substation installation cooperatees and accomplishes ground connection route selection and reports an emergency and asks for help or increased vigilance (trip) function, and after ground fault took place for the circuit, arc suppression coil automatic instantaneous drop into well resistance made the zero sequence current increase, and ground connection route selection relay satisfies logic such as settlement time interval requirement through twice zero sequence current sudden change in the certain time, twice sudden change, judges the ground connection route, realizes that ground connection route selection reports an emergency and asks for help or increased vigilance or trip.
Description
Technical Field
The utility model relates to an electric power system trade especially relates to a distributed undercurrent ground connection route selection of transformer substation reports an emergency and asks for help or increased vigilance tripping relay.
Background
At present, most domestic power systems of 35KV and below adopt an ungrounded or arc suppression coil grounded operation mode, because the circuit capacitance current is very small when the power systems are grounded, particularly the residual current after compensation of the arc suppression coil is smaller, a plurality of installed grounding line selection devices cannot correctly select lines for warning, cannot select lines for tripping, and can only manually select lines for tripping one by one, the fault removal time is prolonged, and the power supply reliability of users is reduced; meanwhile, the existing grounding line selection device adopts a centralized line selection mode, so that dozens of spaced zero-sequence currents are required to be gathered together by cables in both conventional stations and intelligent stations, and the workload of installation and maintenance is huge; even if the device can correctly select the line and trip, dozens of cables need to be placed to each interval, the safety, the reliability and the maintenance convenience are difficult to ensure, and the centralized line selection mode is urgently required to be changed into the distributed line selection mode on site.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the technical problem who exists among the prior art, provide a simple structure's undercurrent ground connection route selection relay.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a low-current grounding line selection relay comprises a shell, wherein a display screen, a wiring terminal row comprising a plurality of wiring terminals of different types, an operation key, a power switch and a reset key are arranged on a front panel of the shell;
a circuit board is arranged in the shell and comprises a signal receiving circuit, a comparison processing circuit and a signal output circuit which are sequentially connected, and the comparison processing circuit is also connected with a liquid crystal display driving circuit;
the display screen is connected to the liquid crystal display driving circuit, the wiring terminals are respectively connected with the signal receiving circuit or the signal output circuit according to different types, the operation key and the reset key are connected to the comparison processing circuit, and the power switch provides a direct-current working power supply for the whole device.
Specifically, the wiring terminal comprises a direct current power supply wiring terminal, a zero sequence electric wiring terminal current, an alarm wiring terminal and a trip input/output wiring terminal.
The utility model discloses the arc suppression coil of relay and transformer substation installation cooperatees and accomplishes ground connection route selection and reports an emergency and asks for help or increased vigilance (trip) function, and after ground fault took place for the circuit, arc suppression coil automatic instantaneous drop into well resistance made the zero sequence current increase, and ground connection route selection relay satisfies logic such as settlement time interval requirement through twice zero sequence current sudden change in the certain time, twice sudden change, judges the ground connection route, realizes that ground connection route selection reports an emergency and asks for help or increased vigilance or trip.
The utility model discloses the relay has realized that undercurrent grounding system dispersion route selection reports an emergency and asks for help or increased vigilance and promptness that the route selection was reported an emergency and asked for help or increased the power supply reliability of user, has reduced a large amount of secondary cable laying simultaneously, has reduced the installation and debugging that consequently brings and has overhauld the huge work load of maintaining the production.
Preferably, an operation warning lamp is further arranged on the front panel of the shell, and an indicator lamp driving circuit connected with the comparison processing circuit is further arranged on a circuit board arranged in the shell; the operation warning lamp is connected to the indicator lamp driving circuit. When the comparison processing circuit starts the information output circuit to send out warning information and the selection switch, the corresponding warning lamp is lightened through the indicating lamp driving circuit.
Preferably, a circuit board arranged in the housing further includes an instruction receiving circuit connected to the comparison processing circuit. And the control device is used for receiving related operation control instructions sent by the upper computer and carrying out related setting on the comparison processing circuit control device.
Preferably, fixing bases are installed on two sides of the back panel of the shell, and installation through holes are formed in the fixing bases. The relay can be installed on the cabinet body through the fixed base or installed on the terminal strip, and the device is prevented from being placed at will.
Drawings
Fig. 1 is a structural diagram of a distributed small-current grounding line selection alarm tripping relay of a transformer substation provided by the embodiment of the invention;
FIG. 2 is a schematic diagram of a decentralized low current grounding line selection alarm trip relay of a transformer substation;
FIG. 3 is a logic block diagram of a decentralized low current ground route selection alarm trip relay of a substation;
FIG. 4 is a schematic block diagram of a distributed low current ground route selection alarm trip relay circuit of a substation;
FIG. 5 is a schematic diagram of a zero sequence current acquisition circuit;
FIG. 6 is a schematic diagram of a comparison processing circuit implemented based on a single chip microcomputer;
FIG. 7 is a schematic diagram of a signal output circuit and an indicator light driving circuit;
fig. 8 is a schematic diagram of a liquid crystal display driving circuit.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
For the convenience implement transformer substation undercurrent ground connection route selection and report an emergency and ask for help or increased vigilance tripping operation function, promote the exactness, the promptness of route selection, guarantee electric wire netting safe and reliable operation, the utility model provides a distributed undercurrent ground connection route selection of transformer substation reports an emergency and asks for help or increased vigilance tripping operation relay, for the explanation technical scheme, explain through concrete embodiment below.
Fig. 1 shows a structure diagram of a distributed low-current grounding line selection alarm trip relay in a transformer substation, which is provided by the embodiment of the present invention, and only shows parts related to the embodiment of the present invention for convenience of description.
As shown in fig. 1-4, the distributed low-current grounding line selection alarm trip relay for a transformer substation provided in this embodiment includes a housing 1, a display screen 2, an operation key 4, a power switch 5, an operation alarm lamp 6 and a reset key 7 are disposed in front of the housing, a connection terminal row 3 is disposed at an upper end of a front panel of the housing, a circuit board (not shown in the figure) is disposed in the housing, the circuit board includes a signal receiving circuit 51, a comparison processing circuit 52 and a signal output circuit 53 which are connected in sequence, the comparison processing circuit 52 is further connected to a liquid crystal display driving circuit 54, an indicator lamp driving circuit 55 and an instruction receiving circuit 56, the display screen 2 is connected to the liquid crystal display driving circuit 54, the operation alarm lamp 6 is connected to the indicator lamp driving circuit 55, the operation key 4 and the reset key 7 are connected to the comparison processing circuit 52, the connection terminals are respectively connected to the signal receiving circuit 51 and the signal output circuit 53 according to different types. The power switch provides a direct current working power supply for the whole device.
Wherein the signal receiving circuit 51 is a zero sequence current detection circuit, as shown in fig. 5; the comparison processing circuit 52 is realized based on an STM32 series single chip microcomputer, as shown in FIG. 6; the signal output circuit 53 and the indicator light driving circuit 55 are specifically implemented as shown in fig. 7; the liquid crystal display driving circuit 54 is embodied as shown in fig. 8.
The wiring terminal comprises a direct current power supply wiring terminal, a zero sequence current wiring terminal, an alarm wiring terminal and a trip input/output wiring terminal.
After the relay is powered on and operated, the comparison processing circuit continuously detects the magnitude of the zero sequence current sent by the signal receiving circuit, judges whether the zero sequence current has sudden change and reaches a threshold value, whether the zero sequence current at least meets the current sudden change twice within a set time, and the time between the current sudden changes is greater than the threshold value, the comparison processing circuit starts the information output circuit to send an alarm signal and a selective tripping switch, and simultaneously lights a corresponding alarm lamp through the indicator lamp driving circuit, and the action logic of the relay is as shown in fig. 3.
The instruction receiving circuit is used for receiving related operation control instructions and carrying out related setting on the comparison processing circuit control device. In addition, the reset key is used for triggering the control device to restart.
In fig. 1, unable adjustment base 8 is equipped with to the backplate both sides of casing, is provided with mounting hole 61 on the base, can install the relay on the cabinet body through unable adjustment base, or install on the terminal row (not drawn in the figure), avoids this device to place at will.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A low-current grounding line selection relay is characterized by comprising a shell (1),
a display screen (2), a wiring terminal row comprising a plurality of wiring terminals (3) of different types, an operation key (4), a power switch (5) and a reset key (7) are arranged on a front panel of the shell (1);
a circuit board is arranged in the shell (1), the circuit board comprises a signal receiving circuit (51), a comparison processing circuit (52) and a signal output circuit (53) which are connected in sequence, and the comparison processing circuit is also connected with a liquid crystal display driving circuit (54);
the display screen (2) is connected to the liquid crystal display driving circuit, the connecting terminal (3) is respectively connected with the signal receiving circuit (51) or the signal output circuit (53) according to different types, the operation key (4) and the reset key (7) are connected to the comparison processing circuit (52), and the power switch (5) provides a direct-current working power supply for the whole device.
2. A small current ground select relay according to claim 1 wherein said terminals include a dc power terminal, a zero sequence current terminal, an alarm terminal and a trip input/output terminal.
3. The low-current grounding line selection relay is characterized in that an operation warning lamp (6) is further arranged on a front panel of the shell (1), and an indicator lamp driving circuit (55) connected with the comparison processing circuit (52) is further arranged on a circuit board arranged in the shell (1); the operation warning lamp (6) is connected to the indicator lamp driving circuit (55).
4. The low-current grounding route selection relay is characterized in that a command receiving circuit (56) connected with the comparison processing circuit (52) is further included on a circuit board arranged in the shell (1).
5. A low current grounding route selection relay according to any one of claims 1-4, characterized in that the back panel of the housing (1) is provided with fixing bases (8) on both sides, and the fixing bases are provided with mounting through holes (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920455553.4U CN209860586U (en) | 2019-04-04 | 2019-04-04 | Low-current grounding line selection relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920455553.4U CN209860586U (en) | 2019-04-04 | 2019-04-04 | Low-current grounding line selection relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209860586U true CN209860586U (en) | 2019-12-27 |
Family
ID=68936379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920455553.4U Expired - Fee Related CN209860586U (en) | 2019-04-04 | 2019-04-04 | Low-current grounding line selection relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209860586U (en) |
-
2019
- 2019-04-04 CN CN201920455553.4U patent/CN209860586U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191227 Termination date: 20200404 |