CN216121909U - Dual-power automatic switching device for transformer substation protection device - Google Patents
Dual-power automatic switching device for transformer substation protection device Download PDFInfo
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- CN216121909U CN216121909U CN202122260383.4U CN202122260383U CN216121909U CN 216121909 U CN216121909 U CN 216121909U CN 202122260383 U CN202122260383 U CN 202122260383U CN 216121909 U CN216121909 U CN 216121909U
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Abstract
The utility model belongs to the technical field of electric power secondary equipment, and particularly relates to a dual-power automatic switching device for a transformer substation protection device; the device comprises a device shell and a built-in main body, wherein a first direct-current power supply positive electrode circuit is connected between a first direct-current power supply positive electrode joint and an output side positive electrode joint, a first direct-current power supply negative electrode circuit is connected between a first direct-current power supply negative electrode joint and an output side negative electrode joint, one end of a second direct-current power supply positive electrode circuit is connected with the second direct-current power supply positive electrode joint, the other end of the second direct-current power supply positive electrode circuit is connected with the rear section of the first direct-current power supply positive electrode circuit, one end of the second direct-current power supply negative electrode circuit is connected with the second direct-current power supply negative electrode joint, the other end of the second direct-current power supply negative electrode circuit is connected with the rear section of the first direct-current power supply negative electrode circuit, and a low-voltage relay is connected between the first direct-current power supply negative electrode circuit and the input side of the first direct-current power supply positive electrode circuit; the utility model has reasonable structure, convenient installation and use, can realize uninterrupted power supply of the protection device and has high working reliability.
Description
Technical Field
The utility model belongs to the technical field of electric power secondary equipment, and particularly relates to a dual-power automatic switching device for a transformer substation protection device.
Background
The protection of the 220kV and above voltage class equipment is a double configuration, two sets of protection respectively obtain the voltage from two sections of independent direct current buses, the working reliability is higher, however, in a 110kV substation, a direct current bus is mostly configured in a single section, all secondary devices are powered by the same direct current bus, with the requirement of improving the reliability of system power supply, the direct current bus of the 110kV substation needs to be gradually transformed into two sections of direct current buses, a protection device should be able to obtain voltages from the two sections of buses respectively, however, the existing protection device only has one direct current power input interface, the dual power input and automatic switching can not be realized when the direct current bus is transformed into two sections of buses, the protection can not be avoided when the power is manually switched, the protection of the protection device is further disabled in a short time, the power supply reliability of the protection device is not actually improved under the condition that the protection device is not transformed doubly, therefore, it is necessary to provide a dual power automatic switching device for a substation protection device.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, and provides the automatic dual-power switching device for the substation protection device, which has a reasonable structure and is convenient to install and use and can realize uninterrupted power supply of the protection device.
The purpose of the utility model is realized as follows: a dual-power automatic switching device for a transformer substation protection device comprises a device shell, wherein a built-in main body is arranged in the device shell, a first power supply connecting terminal, a second power supply connecting terminal and an output connecting terminal are arranged on the rear side surface of the device shell, a first direct-current power supply positive electrode joint, a first direct-current power supply negative electrode joint, a second direct-current power supply positive electrode joint, a second direct-current power supply negative electrode joint, an output side positive electrode joint and an output side negative electrode joint are arranged on the built-in main body, a first direct-current power supply positive electrode circuit is connected between the first direct-current power supply positive electrode joint and the output side positive electrode joint, a first direct-current power supply negative electrode circuit is connected between the first direct-current power supply negative electrode joint and the output side negative electrode joint, one end of the second direct-current power supply positive electrode circuit is connected with the second direct-current power supply positive electrode joint, the other end with the back end of first DC power supply positive pole circuit is connected, the one end of second DC power supply negative pole circuit with second DC power supply negative pole articulate, the other end with the back end of first DC power supply negative pole circuit is connected, first DC power supply negative pole circuit with be connected with low-voltage relay between the input side of first DC power supply positive pole circuit, auxiliary relay's one end through low-voltage relay normally closed contact with first DC power supply positive pole circuit is connected, the other end with first DC power supply negative pole circuit is connected, first DC power supply negative pole circuit with the middle section of first DC power supply positive pole circuit all sets up auxiliary relay normally open contact, second DC power supply positive pole circuit with the middle section of second DC power supply negative pole circuit all sets up auxiliary relay normally closed contact, first DC power supply positive pole joint, The first direct-current power supply negative electrode joint is connected with the first power supply wiring terminal through a terminal connecting wire, the second direct-current power supply positive electrode joint is connected with the second direct-current power supply negative electrode joint through different terminal connecting wires, and the output side positive electrode joint is connected with the output side negative electrode joint through different terminal connecting wires.
And an energy storage capacitor is connected between the first direct current power supply negative electrode circuit and the output side of the first direct current power supply positive electrode circuit.
The capacity of the energy storage capacitor can support the control loop to trip and close the coil more than twice.
A second diode is arranged on the rear section of the negative electrode circuit of the first direct-current power supply, and a first diode is arranged on the rear section of the positive electrode circuit of the first direct-current power supply; the second diode is arranged in front of the energy storage capacitor, and the second direct-current power supply negative electrode line is arranged behind the connection point of the second direct-current power supply negative electrode line and the first direct-current power supply negative electrode line; the first diode is arranged in front of the energy storage capacitor, and the second direct-current power supply positive line is arranged behind a connection point of the second direct-current power supply positive line and the first direct-current power supply positive line; the second direct current power supply negative pole circuit with the tie point of first direct current power supply negative pole circuit, the second direct current power supply positive pole circuit with the tie point of first direct current power supply positive pole circuit set up in auxiliary relay normally open contact auxiliary relay normally closed contact's back.
The front side face of the device shell is connected with a front end panel, the edges of two sides of the front end panel are provided with screw fixing holes, and the screw fixing holes are long round holes.
The front panel is provided with a first input indicator lamp, a second input indicator lamp and an output indicator lamp, and the first input indicator lamp, the second input indicator lamp and the output indicator lamp are respectively connected with the built-in main body through different indicator lamp connecting wires.
The first input indicator lamp, the second input indicator lamp and the output indicator lamp are all red LED lamps.
The first power supply wiring terminal, the second power supply wiring terminal and the output wiring terminal are connected with an external loop in a screw crimping mode.
The utility model has the beneficial effects that: the utility model relates to a double-power-supply automatic switching device for a transformer substation protection device, which can be connected with a first direct-current power supply through a first power supply wiring terminal connected with a first direct-current power supply positive electrode connector and a first direct-current power supply negative electrode connector, connected with a second direct-current power supply through a second power supply wiring terminal connected with a second direct-current power supply positive electrode connector and a second direct-current power supply negative electrode connector, and used for monitoring the main working power supply of the protection device by using a low-voltage relay, wherein when the voltage of the main working power supply is too low, the low-voltage relay acts, an auxiliary relay controlled by a low-voltage relay normally-closed contact loses power and returns, and a normally-open contact of the auxiliary relay is disconnected, The auxiliary relay normally closed contact is closed, the protective device is automatically switched to a standby power supply, the low-voltage relay returns after the voltage of the main power supply recovers, the protective device is automatically switched to the main power supply for power supply, the device can realize the uninterrupted power supply of the protective device with the voltage class of 110kV or below, the protective device can be automatically switched to the main power supply for running after the voltage of the main working power supply recovers, the load balance of two sections of direct current buses is facilitated, meanwhile, the device has few used components and high working reliability; the automatic dual-power switching device for the transformer substation protection device is reasonable in structure, convenient to install and use, capable of achieving uninterrupted power supply of the protection device and high in working reliability.
Drawings
Fig. 1 is a schematic front view of a dual power supply automatic switching device for a substation protection device according to the present invention.
Fig. 2 is a schematic top view of a dual power supply automatic switching device for a substation protection device according to the present invention.
Fig. 3 is a left side view structural diagram of a dual power supply automatic switching device for a substation protection device according to the present invention.
Fig. 4 is a schematic diagram of an internal structure of a dual power supply automatic switching device for a substation protection device according to the present invention.
Fig. 5 is a schematic diagram of a circuit connection inside a main body of the dual power automatic switching device for the substation protection device according to the present invention.
In the figure: 1. a front panel 2, a screw fixing hole 3, a first input indicator lamp 4, a second input indicator lamp 5, an output indicator lamp 6, a device case 7, a first power connection terminal 8, a second power connection terminal 9, an output connection terminal 10, a built-in body 11, a terminal connection wire 12, an indicator lamp connection wire 13, a second dc power negative electrode terminal 14, a second dc power positive electrode terminal 15, a first dc power negative electrode terminal 16, a first dc power positive electrode terminal 17, a low-voltage relay 18, a low-voltage relay normally-closed contact 19, an auxiliary relay 20, an auxiliary relay normally-open contact 21, a first dc power negative electrode circuit 22, a first dc power positive electrode circuit 23, a second diode 24, a first diode 25, an output side positive electrode terminal 26, an energy storage capacitor 27, a power supply voltage control circuit, a power supply circuit, a power, An output side negative electrode connector 28, an auxiliary relay normally closed contact 29, a second direct current power supply negative electrode circuit 30 and a second direct current power supply positive electrode circuit.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 5, a dual power supply automatic switching device for a substation protection device comprises a device housing 6, a built-in main body 10 is arranged in the device housing 6, a first power supply terminal 7, a second power supply terminal 8 and an output terminal 9 are arranged on the rear side surface of the device housing 6, a first direct current power supply positive electrode connector 16, a first direct current power supply negative electrode connector 15, a second direct current power supply positive electrode connector 14, a second direct current power supply negative electrode connector 13, an output side positive electrode connector 25 and an output side negative electrode connector 27 are arranged on the built-in main body 10, a first direct current power supply positive electrode circuit 22 is connected between the first direct current power supply positive electrode connector 16 and the output side positive electrode connector 25, a first direct current power supply negative electrode circuit 21 is connected between the first direct current power supply negative electrode connector 15 and the output side negative electrode connector 27, one end of a second direct-current power supply positive electrode circuit 30 is connected with the second direct-current power supply positive electrode connector 14, the other end is connected with the back section of the first direct-current power supply positive electrode circuit 22, one end of a second direct-current power supply negative electrode circuit 29 is connected with the second direct-current power supply negative electrode connector 13, the other end is connected with the back section of the first direct-current power supply negative electrode circuit 21, a low-voltage relay 17 is connected between the first direct-current power supply negative electrode circuit 21 and the input side of the first direct-current power supply positive electrode circuit 22, one end of an auxiliary relay 19 is connected with the first direct-current power supply positive electrode circuit 22 through a low-voltage relay normally-closed contact 18, the other end is connected with the first direct-current power supply negative electrode circuit 21, the first direct-current power supply negative electrode circuit 21 and the middle section of the first direct-current power supply positive electrode circuit 22 are both provided with an auxiliary relay normally-open contact 20, the second direct current power supply positive electrode circuit 30 with the middle section of second direct current power supply negative electrode circuit 29 all sets up auxiliary relay normally closed contact 28, first direct current power supply positive electrode joint 16 first direct current power supply negative electrode joint 15 through terminal connecting wire 11 with first power supply binding post 7 is connected, second direct current power supply positive electrode joint 14 with second direct current power supply negative electrode joint 13 through different terminal connecting wire 11 with second power supply binding post 8 is connected, output side positive electrode joint 25 with output side negative electrode joint 27 through different terminal connecting wire 11 with output binding post 9 is connected.
The utility model relates to a double-power automatic switching device for a transformer substation protection device, which can be connected with a first direct-current power supply through a first power supply wiring terminal 7 connected with a first direct-current power supply positive electrode connector 16 and a first direct-current power supply negative electrode connector 15, connected with a second direct-current power supply through a second power supply wiring terminal 8 connected with a second direct-current power supply positive electrode connector 14 and a second direct-current power supply negative electrode connector 13, and used for monitoring the main working power supply of the protection device by using a low-voltage relay 17, wherein the low-voltage relay 17 acts when the voltage of the main working power supply is too low, an auxiliary relay 19 controlled by a low-voltage relay normally-closed contact 18 loses power and returns, the auxiliary relay normally open contact 20 is disconnected, the auxiliary relay normally closed contact 28 is closed, the protection device is automatically switched to a standby power supply, the low-voltage relay 17 returns after the voltage of the main power supply is recovered, the protection device is automatically switched to the main power supply for power supply, the device can realize the uninterrupted power supply of the protection device with the voltage level of 110kV or below, the protection device can be automatically switched to the main power supply for operation after the voltage of the main working power supply is recovered, the load balance of two sections of direct current buses is facilitated, meanwhile, the device uses few components and parts, and has high working reliability; the automatic dual-power switching device for the transformer substation protection device is reasonable in structure, convenient to install and use, capable of achieving uninterrupted power supply of the protection device and high in working reliability.
Example 2
As shown in fig. 1 to 5, a dual power supply automatic switching device for a substation protection device comprises a device housing 6, a built-in main body 10 is arranged in the device housing 6, a first power supply terminal 7, a second power supply terminal 8 and an output terminal 9 are arranged on the rear side surface of the device housing 6, a first direct current power supply positive electrode connector 16, a first direct current power supply negative electrode connector 15, a second direct current power supply positive electrode connector 14, a second direct current power supply negative electrode connector 13, an output side positive electrode connector 25 and an output side negative electrode connector 27 are arranged on the built-in main body 10, a first direct current power supply positive electrode circuit 22 is connected between the first direct current power supply positive electrode connector 16 and the output side positive electrode connector 25, a first direct current power supply negative electrode circuit 21 is connected between the first direct current power supply negative electrode connector 15 and the output side negative electrode connector 27, one end of a second direct-current power supply positive electrode circuit 30 is connected with the second direct-current power supply positive electrode connector 14, the other end is connected with the back section of the first direct-current power supply positive electrode circuit 22, one end of a second direct-current power supply negative electrode circuit 29 is connected with the second direct-current power supply negative electrode connector 13, the other end is connected with the back section of the first direct-current power supply negative electrode circuit 21, a low-voltage relay 17 is connected between the first direct-current power supply negative electrode circuit 21 and the input side of the first direct-current power supply positive electrode circuit 22, one end of an auxiliary relay 19 is connected with the first direct-current power supply positive electrode circuit 22 through a low-voltage relay normally-closed contact 18, the other end is connected with the first direct-current power supply negative electrode circuit 21, the first direct-current power supply negative electrode circuit 21 and the middle section of the first direct-current power supply positive electrode circuit 22 are both provided with an auxiliary relay normally-open contact 20, the second direct current power supply positive electrode circuit 30 with the middle section of second direct current power supply negative electrode circuit 29 all sets up auxiliary relay normally closed contact 28, first direct current power supply positive electrode joint 16 first direct current power supply negative electrode joint 15 through terminal connecting wire 11 with first power supply binding post 7 is connected, second direct current power supply positive electrode joint 14 with second direct current power supply negative electrode joint 13 through different terminal connecting wire 11 with second power supply binding post 8 is connected, output side positive electrode joint 25 with output side negative electrode joint 27 through different terminal connecting wire 11 with output binding post 9 is connected.
For better effect, an energy storage capacitor 26 is connected between the output sides of the first direct-current power supply negative electrode circuit 21 and the first direct-current power supply positive electrode circuit 22, so that the power loss of the contact switching gap protection device of the auxiliary relay 19 can be effectively avoided.
For better effect, the capacity of the energy storage capacitor 26 can support the control loop to trip and close the coil more than twice, so that the protection device can still control the breaker to reliably operate under the extreme condition that the system fails while two power supplies are lost.
For better effect, a second diode 23 is arranged on the rear section of the first dc power supply negative line 21, a first diode 24 is arranged on the rear section of the first dc power supply positive line 22, the second diode 23 is arranged in front of the energy storage capacitor 26, and the second dc power supply negative line 29 is arranged behind the connection point of the first dc power supply negative line 21; the first diode 24 is arranged in front of the energy storage capacitor 26 and behind the connection point of the second dc power supply positive line 30 and the first dc power supply positive line 22; the second direct current power supply negative electrode circuit 29 with the tie point of first direct current power supply negative electrode circuit 21, the second direct current power supply positive electrode circuit 30 with the tie point of first direct current power supply positive electrode circuit 22 set up in auxiliary relay normally open contact 20, auxiliary relay normally closed contact 28's back can guarantee that energy storage capacitor 26 can work safely effectively.
For better effect, be connected with front panel 1 on the leading flank of device casing 6, front panel 1's both sides edge all is provided with screw fixation hole 2, screw fixation hole 2 is the slotted hole, and simple structure is reasonable, is convenient for this device and other equipment be connected.
For better effect, be provided with first input indicator lamp 3, second input indicator lamp 4 and output indicator lamp 5 on the front end panel 1, first input indicator lamp 3, second input indicator lamp 4 and output indicator lamp 5 respectively through different pilot lamp connecting wire 12 with built-in main part 10 is connected, the different operating condition of this device is shown to each pilot lamp of accessible, improves the practicality of this device.
For better effect, first input indicator lamp 3, second input indicator lamp 4 with output indicator lamp 5 is red LED lamp, and the different operating condition of this device is shown to each pilot lamp of accessible, improves the practicality of this device.
For better effect, first power binding post 7, second power binding post 8 with output binding post 9 all adopts the mode of screw crimping to be connected with the external loop, connects stably, convenient and fast.
The utility model relates to a double-power automatic switching device for a transformer substation protection device, which can be connected with a first direct-current power supply through a first power supply wiring terminal 7 connected with a first direct-current power supply positive electrode connector 16 and a first direct-current power supply negative electrode connector 15, connected with a second direct-current power supply through a second power supply wiring terminal 8 connected with a second direct-current power supply positive electrode connector 14 and a second direct-current power supply negative electrode connector 13, and used for monitoring the main working power supply of the protection device by using a low-voltage relay 17, wherein the low-voltage relay 17 acts when the voltage of the main working power supply is too low, an auxiliary relay 19 controlled by a low-voltage relay normally-closed contact 18 loses power and returns, the auxiliary relay normally open contact 20 is disconnected, the auxiliary relay normally closed contact 28 is closed, the protection device is automatically switched to a standby power supply, the low-voltage relay 17 returns after the voltage of the main power supply is recovered, the protection device is automatically switched to the main power supply for power supply, the device can realize the uninterrupted power supply of the protection device with the voltage level of 110kV or below, the protection device can be automatically switched to the main power supply for operation after the voltage of the main working power supply is recovered, the load balance of two sections of direct current buses is facilitated, meanwhile, the device uses few components and parts, and has high working reliability; the automatic dual-power switching device for the transformer substation protection device is reasonable in structure, convenient to install and use, capable of achieving uninterrupted power supply of the protection device and high in working reliability.
Claims (8)
1. The utility model provides a dual supply automatic switching control equipment for protection device of transformer substation, it includes device casing (6), its characterized in that: the device is characterized in that a built-in main body (10) is arranged in the device shell (6), a first power supply wiring terminal (7), a second power supply wiring terminal (8) and an output wiring terminal (9) are arranged on the rear side surface of the device shell (6), a first direct current power supply positive electrode joint (16), a first direct current power supply negative electrode joint (15), a second direct current power supply positive electrode joint (14), a second direct current power supply negative electrode joint (13), an output side positive electrode joint (25) and an output side negative electrode joint (27) are arranged on the built-in main body (10), a first direct current power supply positive electrode circuit (22) is connected between the first direct current power supply positive electrode joint (16) and the output side positive electrode joint (25), a first direct current power supply negative electrode circuit (21) is connected between the first direct current power supply negative electrode joint (15) and the output side negative electrode joint (27), one end of the second direct-current power supply positive electrode circuit (30) and the second direct-current power supply positive electrode joint (14) are connected, the other end and the back end of the first direct-current power supply positive electrode circuit (22) are connected, one end of the second direct-current power supply negative electrode circuit (29) and the second direct-current power supply negative electrode joint (13) are connected, the other end and the back end of the first direct-current power supply negative electrode circuit (21) are connected, the first direct-current power supply negative electrode circuit (21) and the input side of the first direct-current power supply positive electrode circuit (22) are connected with a low-voltage relay (17), one end of an auxiliary relay (19) is connected with the first direct-current power supply positive electrode circuit (22) through a low-voltage relay normally-closed contact (18), the other end is connected with the first direct-current power supply negative electrode circuit (21), the first direct-current power supply negative electrode circuit (21) and the middle section of the first direct-current power supply positive electrode circuit (22) are both provided with an auxiliary relay normally-open contact (20) The utility model discloses a direct current power supply, the second direct current power supply positive pole circuit (30) with the middle section of second direct current power supply negative pole circuit (29) all sets up auxiliary relay normally closed contact (28), first direct current power supply positive pole connects (16) first direct current power supply negative pole connects (15) through terminal connecting wire (11) with first power binding post (7) are connected, second direct current power supply positive pole connects (14) with second direct current power supply negative pole connects (13) through different terminal connecting wire (11) with second power binding post (8) are connected, output side positive pole connects (25) with output side negative pole connects (27) through different terminal connecting wire (11) with output binding post (9) are connected.
2. The dual-power automatic switching device for the substation protection device according to claim 1, characterized in that: an energy storage capacitor (26) is connected between the output side of the first direct-current power supply negative electrode circuit (21) and the output side of the first direct-current power supply positive electrode circuit (22).
3. The dual-power automatic switching device for the substation protection device according to claim 2, characterized in that: the capacity of the energy storage capacitor (26) can support the control loop to trip and close the coil more than twice.
4. The dual-power automatic switching device for the substation protection device according to claim 2, characterized in that: a second diode (23) is arranged on the rear section of the first direct-current power supply negative electrode circuit (21); a first diode (24) is arranged on the rear section of the first direct-current power supply positive electrode line (22); the second diode (23) is arranged in front of the energy storage capacitor (26), and the second direct-current power supply negative electrode line (29) is arranged behind the connection point of the first direct-current power supply negative electrode line (21); the first diode (24) is arranged in front of the energy storage capacitor (26), and the second direct-current power supply positive line (30) is arranged behind the connection point of the first direct-current power supply positive line (22); second direct current power supply negative pole circuit (29) with the tie point of first direct current power supply negative pole circuit (21), second direct current power supply positive pole circuit (30) with the tie point of first direct current power supply positive pole circuit (22) set up in auxiliary relay normally open contact (20), the back of auxiliary relay normally closed contact (28).
5. The dual-power automatic switching device for the substation protection device according to claim 1, characterized in that: the device is characterized in that a front end panel (1) is connected to the front side face of the device shell (6), screw fixing holes (2) are formed in edges of two sides of the front end panel (1), and the screw fixing holes (2) are long round holes.
6. The dual-power automatic switching device for the substation protection device according to claim 5, characterized in that: the front end panel (1) is provided with a first input indicator lamp (3), a second input indicator lamp (4) and an output indicator lamp (5), and the first input indicator lamp (3), the second input indicator lamp (4) and the output indicator lamp (5) are respectively connected with the built-in main body (10) through different indicator lamp connecting wires (12).
7. The dual-power automatic switching device for the substation protection device according to claim 6, characterized in that: the first input indicator lamp (3), the second input indicator lamp (4) and the output indicator lamp (5) are all red LED lamps.
8. The dual-power automatic switching device for the substation protection device according to claim 1, characterized in that: first power binding post (7), second power binding post (8) with output binding post (9) all adopt the mode of screw crimping to be connected with the outside return circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122260383.4U CN216121909U (en) | 2021-09-17 | 2021-09-17 | Dual-power automatic switching device for transformer substation protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122260383.4U CN216121909U (en) | 2021-09-17 | 2021-09-17 | Dual-power automatic switching device for transformer substation protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216121909U true CN216121909U (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122260383.4U Active CN216121909U (en) | 2021-09-17 | 2021-09-17 | Dual-power automatic switching device for transformer substation protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216121909U (en) |
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2021
- 2021-09-17 CN CN202122260383.4U patent/CN216121909U/en active Active
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