CN217215971U - Power supply switching loop for power monitoring terminal - Google Patents
Power supply switching loop for power monitoring terminal Download PDFInfo
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- CN217215971U CN217215971U CN202220911107.1U CN202220911107U CN217215971U CN 217215971 U CN217215971 U CN 217215971U CN 202220911107 U CN202220911107 U CN 202220911107U CN 217215971 U CN217215971 U CN 217215971U
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- relay
- bus voltage
- electrically connected
- switch
- output terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The utility model relates to an electric power switching technology field discloses a power supply switching circuit for electric power monitor terminal, including first busbar voltage input terminal, second busbar voltage input terminal, first busbar voltage output terminal, second busbar voltage output terminal, relay ZJ1, relay ZJ2 and relay ZJ3, when in actual use, through using the utility model discloses, when switch S1, switch S2 and switch S3 pressed down simultaneously, only two relay actions at most in relay ZJ1, relay ZJ2 and the relay ZJ3 can avoid first busbar voltage input terminal and second busbar voltage input terminal short circuit, avoid appearing the incident.
Description
Technical Field
The utility model relates to an electric power switches technical field, concretely relates to power supply switching circuit for electric power monitor terminal.
Background
In an electric power system, power monitoring protection is of great importance, and particularly, in the detection and control of a station alternating current system of a transformer substation, when a certain power supply fails, an output power supply needs to be immediately switched to a standby power supply so as not to influence normal power utilization. As shown in fig. 1, in the conventional power supply switching circuit, a first bus voltage input terminal is electrically connected to a first bus output voltage terminal through a normally open contact of a relay ZJ1, a second bus voltage input terminal is electrically connected to a second bus output voltage terminal through a normally open contact of a relay ZJ2, and the first bus voltage output terminal is electrically connected to the second bus output voltage terminal through a normally open contact of a relay ZJ 3. When the control coil of the relay ZJ1 and the control coil of the relay ZJ3 are energized, the power input from the first bus voltage input terminal is output from the first bus voltage output terminal and the second bus voltage output terminal, respectively; when the control coil of the relay ZJ2 and the control coil of the relay ZJ3 are energized, the power input from the second bus voltage input terminal is output from the first bus voltage output terminal and the second bus voltage output terminal, respectively. However, the control coils of the relay ZJ1, the relay ZJ2 and the relay ZJ3 are controlled by manual operation, and there is a possibility that an error operation simultaneously energizes the control coils of the relay ZJ1, the relay ZJ2 and the relay ZJ3 during actual use, thereby causing a short circuit between the first bus voltage input terminal and the second bus voltage input terminal.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of background art, the utility model provides a power supply switching circuit for electric power monitor terminal, the technical problem that solve is that current power supply switching circuit lacks the safeguard measure, and artifical maloperation probably leads to first bus voltage input terminal and second bus voltage input terminal short circuit, the incident appears.
For solving the technical problem, the utility model provides a following technical scheme: a power supply switching circuit for a power monitoring terminal comprises a first bus voltage input terminal, a second bus voltage input terminal, a first bus voltage output terminal, a second bus voltage output terminal, a relay ZJ1, a relay ZJ2 and a relay ZJ 3; the first bus voltage input terminal is electrically connected with the first bus voltage output terminal through a normally open contact of the relay ZJ 1; the second bus voltage input terminal is electrically connected with the second bus voltage output terminal through a normally open contact of the relay ZJ 2; the first bus voltage output terminal is electrically connected with the second bus voltage output terminal through a normally open contact of a relay ZJ 3;
the circuit also comprises a positive power supply end, a negative power supply end, a switch S1, a switch S2 and a switch S3; the positive power terminal is electrically connected with one end of the switch S1, one end of the switch S2 and one end of the switch S3 respectively;
the other end of the switch S1 is electrically connected with one end of a control coil of the relay ZJ1, and the other end of the control coil of the relay ZJ1 is electrically connected with a negative power supply end;
the other end of the switch S2 is electrically connected with one end of a control coil of the relay ZJ2, and the other end of the control coil of the relay ZJ2 is electrically connected with a negative power supply end;
the other end of the switch S3 is respectively and electrically connected with one contact of a pair of normally open contacts of the relay ZJ1 and one contact of a pair of normally open contacts of the relay ZJ 2; the other contact of the pair of normally open contacts of the relay ZJ1 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ2, and the other contact of the pair of normally closed contacts of the relay ZJ2 is electrically connected with one end of the control coil of the relay ZJ 3; the other contact of the pair of normally open contacts of the relay ZJ2 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ1, the other contact of the pair of normally closed contacts of the relay ZJ1 is electrically connected with one end of the control coil of the relay ZJ3, and the other end of the control coil of the relay ZJ3 is electrically connected with the negative power supply end.
As a further technical solution, the first bus voltage input terminal, the second bus voltage input terminal, the first bus voltage output terminal and the second bus voltage output terminal each include four terminals; the first bus voltage input terminal is electrically connected with the first bus voltage output terminal through four pairs of normally open contacts of the relay ZJ 1; the second bus voltage input terminal is electrically connected with the second bus voltage output terminal through four pairs of normally open contacts of the relay ZJ 2; the first bus voltage output terminal is electrically connected with the second bus voltage output terminal through four pairs of normally open contacts of a relay ZJ 3.
As a further technical scheme, the switch S1, the switch S2 and the switch S3 are all normally open switches.
The working principle of the utility model is as follows:
a pair of normally open contacts of the relay ZJ1 electrically connected with the switch S3 and a normally closed contact of the relay ZJ2 electrically connected with the normally open contacts are taken as a branch I; a pair of normally open contacts of the relay ZJ2 electrically connected with the switch S3 and a normally closed contact of the relay ZJ1 electrically connected with the normally open contacts are used as a branch circuit II;
when the positive power supply end is connected with a power supply, if the switch S1 is pressed and kept firstly, the control coil of the relay ZJ1 is electrified, the normally open contact of the relay ZJ1 is closed, and the first bus voltage input terminal is electrically connected with the first bus voltage output terminal; at this time, if the switch S3 is pressed and held, the control coil of the relay ZJ3 is electrically connected to the power supply through the first branch, and the first bus voltage input terminal is electrically connected to the second bus voltage output terminal through the relay ZJ 3; in this case, if switch S2 is pressed, the control coil of relay Z3 is in an off state from the power supply, and the first bus voltage output terminal is disconnected from the second bus voltage output terminal;
if the switch S2 is pressed and held first, the control coil of the relay ZJ2 is electrified, the normally open contact of the relay ZJ2 is closed, and the second bus voltage input terminal is electrically connected with the second bus voltage output terminal; at this time, if the switch S3 is pressed and held, the control coil of the relay ZJ3 is electrically connected to the power supply through the second branch, and the second bus voltage input terminal is electrically connected to the first bus voltage output terminal through the relay ZJ 3; in this case, if the switch S1 is pressed, the control coil of the relay Z3 is disconnected from the power supply, and the second bus voltage output terminal is disconnected from the first bus voltage output terminal.
Compared with the prior art, the utility model beneficial effect who has is: through using the utility model discloses, when switch S1, switch S2 and switch S3 pressed down simultaneously, only two relay actions at most in relay ZJ1, relay ZJ2 and the relay ZJ3 can avoid first bus voltage input terminal and second bus voltage input terminal short circuit, avoid appearing the incident.
Drawings
Fig. 1 is a circuit diagram of the present invention in an embodiment.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, a power supply switching circuit for a power monitoring terminal includes a first bus voltage input terminal 11, a second bus voltage input terminal 12, a first bus voltage output terminal 21, a second bus voltage output terminal 22, a relay ZJ1, a relay ZJ2, and a relay ZJ 3; the first bus voltage input terminal 11 is electrically connected with the first bus voltage output terminal 21 through a normally open contact of the relay ZJ 1; the second bus voltage input terminal 12 is electrically connected with the second bus voltage output terminal 22 through a normally open contact of the relay ZJ 2; the first bus voltage output terminal 21 is electrically connected with the second bus voltage output terminal 22 through a normally open contact of a relay ZJ 3;
the switch also comprises a positive power supply end V +, a negative power supply end V-, a switch S1, a switch S2 and a switch S3; the positive power supply end V + is electrically connected with one end of the switch S1, one end of the switch S2 and one end of the switch S3 respectively;
the other end of the switch S1 is electrically connected with one end of a control coil of the relay ZJ1, and the other end of the control coil of the relay ZJ1 is electrically connected with a negative power supply end V < - >;
the other end of the switch S2 is electrically connected with one end of a control coil of the relay ZJ2, and the other end of the control coil of the relay ZJ2 is electrically connected with a negative power supply end V < - >;
the other end of the switch S3 is respectively and electrically connected with one contact of a pair of normally open contacts of the relay ZJ1 and one contact of a pair of normally open contacts of the relay ZJ 2; the other contact of the pair of normally open contacts of the relay ZJ1 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ2, and the other contact of the pair of normally closed contacts of the relay ZJ2 is electrically connected with one end of the control coil of the relay ZJ 3; the other contact of the pair of normally open contacts of the relay ZJ2 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ1, the other contact of the pair of normally closed contacts of the relay ZJ1 is electrically connected with one end of the control coil of the relay ZJ3, and the other end of the control coil of the relay ZJ3 is electrically connected with the negative power supply end V-.
As a further technical solution, the first bus voltage input terminal 11, the second bus voltage input terminal 12, the first bus voltage output terminal 21 and the second bus voltage output terminal 22 each include four terminals; the first bus voltage input terminal 11 is electrically connected with the first bus voltage output terminal 21 through four pairs of normally open contacts of the relay ZJ 1; the second bus voltage input terminal 12 is electrically connected with the second bus voltage output terminal 22 through four pairs of normally open contacts of the relay ZJ 2; the first bus voltage output terminal 21 is electrically connected to the second bus voltage output terminal 22 through four pairs of normally open contacts of a relay ZJ 3.
As a further technical scheme, the switch S1, the switch S2 and the switch S3 are all normally open switches.
The working principle of the utility model is as follows:
a pair of normally open contacts of the relay ZJ1 electrically connected with the switch S3 and a normally closed contact of the relay ZJ2 electrically connected with the normally open contacts are taken as a branch I; a pair of normally open contacts of the relay ZJ2 electrically connected with the switch S3 and a normally closed contact of the relay ZJ1 electrically connected with the normally open contacts are used as a branch II;
when the positive power supply end V + is connected with a power supply, if the switch S1 is pressed and kept firstly, the control coil of the relay ZJ1 is electrified, the normally open contact of the relay ZJ1 is closed, and the first bus voltage input terminal 11 is electrically connected with the first bus voltage output terminal 21; at this time, if the switch S3 is pressed and held, the control coil of the relay ZJ3 is electrically connected to the power supply through the first branch, and the first bus voltage input terminal 11 is electrically connected to the second bus voltage output terminal 22 through the relay ZJ 3; in this case, if the switch S2 is pressed, the control coil of the relay Z3 is in a disconnected state from the power supply, and the first bus voltage output terminal 21 is disconnected from the second bus voltage output terminal 22;
if the switch S2 is pressed and held first, the control coil of the relay ZJ2 is energized, the normally open contact of the relay ZJ2 is closed, and the second bus voltage input terminal 12 is electrically connected with the second bus voltage output terminal 22; at this time, if the switch S3 is pressed and held, the control coil of the relay ZJ3 is electrically connected to the power supply through the second branch, and the second bus voltage input terminal 12 is electrically connected to the first bus voltage output terminal 21 through the relay ZJ 3; in this case, if the switch S1 is pressed, the control coil of the relay Z3 is disconnected from the power supply, and the second bus voltage output terminal 22 is disconnected from the first bus voltage output terminal 21.
In conclusion, through using the utility model discloses, when switch S1, switch S2 and switch S3 pressed down simultaneously, only two relay actions at most in relay ZJ1, relay ZJ2 and relay ZJ3 can avoid first bus voltage input terminal 11 and second bus voltage input terminal 12 short circuit, avoid appearing the incident.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A power supply switching circuit for a power monitoring terminal comprises a first bus voltage input terminal, a second bus voltage input terminal, a first bus voltage output terminal, a second bus voltage output terminal, a relay ZJ1, a relay ZJ2 and a relay ZJ 3; the first bus voltage input terminal is electrically connected with the first bus voltage output terminal through a normally open contact of the relay ZJ 1; the second bus voltage input terminal is electrically connected with the second bus voltage output terminal through a normally open contact of the relay ZJ 2; the first bus voltage output terminal is electrically connected with the second bus voltage output terminal through a normally open contact of a relay ZJ3,
the power supply also comprises a positive power supply end, a negative power supply end, a switch S1, a switch S2 and a switch S3; the positive power terminal is electrically connected with one end of the switch S1, one end of the switch S2 and one end of the switch S3 respectively;
the other end of the switch S1 is electrically connected with one end of a control coil of the relay ZJ1, and the other end of the control coil of the relay ZJ1 is electrically connected with a negative power supply end;
the other end of the switch S2 is electrically connected with one end of a control coil of the relay ZJ2, and the other end of the control coil of the relay ZJ2 is electrically connected with a negative power supply end;
the other end of the switch S3 is respectively and electrically connected with one contact of a pair of normally open contacts of the relay ZJ1 and one contact of a pair of normally open contacts of the relay ZJ 2; the other contact of the pair of normally open contacts of the relay ZJ1 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ2, and the other contact of the pair of normally closed contacts of the relay ZJ2 is electrically connected with one end of the control coil of the relay ZJ 3; the other contact of the pair of normally open contacts of the relay ZJ2 is electrically connected with one contact of the pair of normally closed contacts of the relay ZJ1, the other contact of the pair of normally closed contacts of the relay ZJ1 is electrically connected with one end of the control coil of the relay ZJ3, and the other end of the control coil of the relay ZJ3 is electrically connected with the negative power supply end.
2. A power supply switching circuit for a power monitoring terminal according to claim 1, wherein said first bus voltage input terminal, second bus voltage input terminal, first bus voltage output terminal and second bus voltage output terminal each comprise four terminals; the first bus voltage input terminal is electrically connected with the first bus voltage output terminal through four pairs of normally open contacts of the relay ZJ 1; the second bus voltage input terminal is electrically connected with the second bus voltage output terminal through four pairs of normally open contacts of the relay ZJ 2; the first bus voltage output terminal is electrically connected with the second bus voltage output terminal through four pairs of normally open contacts of a relay ZJ 3.
3. The power switching circuit of claim 1, wherein the switch S1, the switch S2 and the switch S3 are all normally open switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220911107.1U CN217215971U (en) | 2022-04-19 | 2022-04-19 | Power supply switching loop for power monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220911107.1U CN217215971U (en) | 2022-04-19 | 2022-04-19 | Power supply switching loop for power monitoring terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217215971U true CN217215971U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220911107.1U Active CN217215971U (en) | 2022-04-19 | 2022-04-19 | Power supply switching loop for power monitoring terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217215971U (en) |
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2022
- 2022-04-19 CN CN202220911107.1U patent/CN217215971U/en active Active
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