CN213717850U - Isolation transformer electrical circuit with lightning protection and filtering functions - Google Patents
Isolation transformer electrical circuit with lightning protection and filtering functions Download PDFInfo
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- CN213717850U CN213717850U CN202022898217.2U CN202022898217U CN213717850U CN 213717850 U CN213717850 U CN 213717850U CN 202022898217 U CN202022898217 U CN 202022898217U CN 213717850 U CN213717850 U CN 213717850U
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Abstract
The application relates to an isolation transformer electrical circuit with lightning protection filtering function relates to the technical field of isolation cabinet, and it includes: the input circuit is connected with the commercial power input through signals and is used for accessing commercial power; the voltage conversion circuit is in signal connection with the input circuit and is used for performing voltage conversion on the output signal of the input circuit and outputting the output signal; the switch circuit is respectively connected with the input circuit and the voltage conversion circuit in a signal mode and used for gating the input circuit and/or the voltage conversion circuit; and the output circuit is in signal connection with the switching circuit, receives the output signal of the switching circuit, converts the current and outputs the current to the next stage circuit. Input circuit inserts three-phase mains signal in this application, and input circuit's output signal passes through voltage transformation circuit, switch circuit and output circuit in proper order for the mains signal of input passes through switch circuit and selects whether to pass through voltage transformation circuit, simultaneously before the output via the current transformation process, has when guaranteeing uninterrupted power supply, improves the effect of security.
Description
Technical Field
The application relates to the technical field of isolation cabinets, in particular to an isolation transformer electrical circuit with a lightning protection and filtering function.
Background
The power cabinet is a general name of a motor control center. The power cabinet is used in the occasions with dispersed loads and less loops; the motor control center is used for occasions with concentrated loads and more loops. They distribute the power of a certain circuit of the upper-level distribution equipment to the nearby loads. This level of equipment should provide protection, monitoring and control of the load. The power supply cabinet generally includes an incoming line cabinet, an outgoing line cabinet, an isolation cabinet, a PT cabinet, and a switching station. The isolation cabinet is used for isolating buses at two ends or isolating the powered equipment and the power supply equipment, and provides a visible end point so as to facilitate maintenance and overhaul operations.
In view of the above-mentioned related technologies, the inventor thinks that the isolation effect of the isolation cabinet is poor, which easily results in low safety.
SUMMERY OF THE UTILITY MODEL
In order to improve the security of isolation cabinet, this application provides an isolation transformer electrical circuit with lightning protection filtering function.
The application provides a pair of isolation transformer electrical circuit with lightning protection filtering function adopts following technical scheme:
an isolation transformer electrical circuit with lightning protection filtering, comprising:
the input circuit is connected with the commercial power input through signals and is used for accessing commercial power;
the voltage conversion circuit is in signal connection with the input circuit and is used for performing voltage conversion on an output signal of the input circuit and outputting the output signal;
the switching circuit is respectively connected with the input circuit and the voltage conversion circuit in a signal mode and used for gating the input circuit and/or the voltage conversion circuit; and the number of the first and second groups,
and the output circuit is in signal connection with the switching circuit, receives the output signal of the switching circuit, converts the current and outputs the current to the next stage of circuit.
By adopting the technical scheme, the input circuit is connected with the three-phase mains supply signal, and the output signal of the input circuit sequentially passes through the voltage conversion circuit, the switch circuit and the output circuit, so that the input mains supply signal is selected whether to pass through the voltage conversion circuit or not through the switch circuit, and meanwhile, the input mains supply signal passes through the current conversion process before being output, thereby ensuring uninterrupted power supply and improving the safety.
Preferably, the input circuit comprises a mains supply input end, a first current transformer CT1 and a switch piece which are in signal connection in sequence;
the mains supply input end is used for connecting a three-phase mains supply, a neutral line and the ground; the first current transformer CT1 is respectively connected with a three-phase mains supply input end through signals; the switch component is arranged as a first breaker QF1, and a three-phase circuit is arranged as the same as the first breaker QF 1.
By adopting the technical scheme, three-phase mains supply needs to be simultaneously connected into the circuit, the synchronous turn-off and the synchronous turn-on of the input circuit are realized through the first circuit breaker QF1, and the mains supply is connected into the circuit; the first current transformer CT1 transforms an input current to convert a large primary current into a small secondary current.
Preferably, the voltage conversion circuit is configured as an isolation transformer, inputs of the isolation transformer are respectively connected to the three-phase circuit through signals, and the isolation transformer is respectively connected to the switch circuit through signals.
By adopting the technical scheme, the isolation transformer is used for avoiding touching the charged body accidentally and simultaneously and isolating the respective currents of the primary and secondary winding coils.
Preferably, the switch circuit includes a plurality of groups of single-pole double-throw switches, two moving ends of the single-pole double-throw switches are respectively connected to the input circuit and the voltage conversion circuit through signals, and a stationary end of the single-pole double-throw switch is connected to the output circuit through signals.
By adopting the technical scheme, the single-pole double-throw switch is convenient for selecting whether to access the voltage conversion circuit or not.
Preferably, the output circuit includes a second current transformer CT2, and the second current transformers CT2 are respectively disposed in the three-phase circuit.
By adopting the technical scheme, the second current transformer CT2 converts the input current, and converts the large primary current into the small secondary current.
Preferably, the input circuit further comprises a lightning protection circuit, the lightning protection circuit comprises a first lightning protection device BY1 in signal connection with the mains supply input end, and a second circuit breaker QF2 is connected in series between the first lightning protection device BY1 and the mains supply input end.
BY adopting the technical scheme, when spike current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the first lightning protection device BY1 is conducted and shunted in a very short time, so that damage of surge to other equipment in the loop is avoided.
Preferably, the output circuit comprises a three-phase output end and a neutral line output end, and the output circuit is in signal connection with a display circuit;
the display circuit includes:
the output display circuit is connected in parallel between the three-phase output and the neutral line output and comprises an output display lamp and a selection switch which are connected in series;
the input display circuit, the input display lamp that concatenates between neutral conductor output and the three-phase output.
By adopting the technical scheme, the input display circuit is used for displaying the input state, and the output display circuit is used for displaying the output state and whether to access the voltage conversion circuit.
Preferably, the selection switch is a single-pole double-throw switch, and two moving ends of the selection switch are respectively in signal connection with a first power meter signal end DT1 and a second power meter signal end DT 2.
By adopting the technical scheme, the selection switch can gate different loops according to the output of the electric energy meter DT.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the input circuit is connected with a three-phase commercial power signal through the input circuit, the voltage conversion circuit, the switch circuit and the output circuit, and the output signal of the input circuit sequentially passes through the voltage conversion circuit, the switch circuit and the output circuit, so that the input commercial power signal is selected whether to pass through the voltage conversion circuit through the switch circuit, and meanwhile, the input commercial power signal passes through the current conversion process before being output, uninterrupted power supply is ensured, and meanwhile, the safety is improved;
2. through the arrangement of the lightning protection circuit, when peak current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the first lightning protection device BY1 is conducted and shunted in a very short time, so that damage of surge to other equipment in the loop is avoided;
3. through the setting of the display circuit, the input display circuit is used for displaying the input state, and the output display circuit is used for displaying the output state and whether to access the voltage conversion circuit.
Drawings
FIG. 1 is an electrical schematic of an embodiment of the present application;
FIG. 2 is a circuit diagram of a lightning protection circuit according to an embodiment of the present application;
fig. 3 is a circuit diagram of a display circuit according to an embodiment of the present application.
Reference numerals: 1. an input circuit; 2. a voltage conversion circuit; 3. a switching circuit; 4. an output circuit; 5. a lightning protection circuit; 6. a display circuit; 61. an output display circuit; 62. and an input display circuit.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses an isolation transformer electric circuit with a lightning protection and filtering function. Referring to fig. 1, the device mainly includes an input circuit 1 connected to the commercial power, a voltage conversion circuit 2 for converting a voltage signal, and an output circuit 4 for selecting whether to connect a switch circuit 3 of the voltage conversion circuit 2 or not to output the signal.
The input circuit 1 is connected with a mains supply input signal, and has the main function of accessing the mains supply signal to supply electric energy to the circuit by mains supply; in detail, the input circuit 1 includes a mains input terminal, a first current transformer CT1 and a switch element, which are connected in sequence by signals.
The commercial power input end is respectively connected with a three-phase commercial power, a neutral line and the ground so as to ensure the normal conduction of the circuit; in the embodiment of the application, three first current transformers CT1 are arranged and respectively connected with the input end of each phase of the three-phase commercial power; the switch component is arranged as a first breaker QF1, and the three-phase circuit is in signal connection with the same first breaker QF 1.
Referring to fig. 1 and 2, the input circuit 1 further includes a lightning protection circuit 5, and the lightning protection circuit 5 includes: the first lightning protection device BY1 is in signal connection with the mains supply input end, and the second circuit breaker QF2 is connected between the first lightning protection device BY1 and the mains supply input end in series. One end of the first lightning protector BY1 far away from the mains input end is grounded to form a closed loop.
Referring to fig. 1, a voltage conversion circuit 2 is in signal connection with an input circuit 1, and mainly functions to convert the voltage of an output signal of the input circuit 1 and output the converted output signal to a switch circuit 3. In the embodiment of the present application, the voltage converting circuit 2 is configured as an isolation transformer, an input end of the isolation transformer is respectively in signal connection with a three-phase output end of the first circuit breaker QF1, an output end of the isolation transformer is in signal connection with the switch circuit 3, and a signal after voltage conversion is transmitted to an input end of the switch circuit 3.
The isolation transformer in the embodiment of the application is configured as a core type transformer, wherein the core is configured as an iron core or a magnetic core, and one point of the iron core or the magnetic core is grounded.
The input end of the switch circuit 3 is respectively connected with the input circuit 1 and the voltage conversion circuit 2 by signals, and the main function is whether to connect the voltage conversion circuit 2.
In detail, the switch circuit 3 includes a plurality of groups of single-pole double-throw switches, two moving ends of each single-pole double-throw switch are respectively connected with the output ends of the input circuit 1 and the voltage conversion circuit 2 by signals, and the fixed end of each single-pole double-throw switch is connected with the output circuit 4 by signals.
The input end of the output circuit 4 is in signal connection with the output end of the switch circuit 3, and the output circuit 4 receives the output signal of the switch circuit 3, and then carries out current conversion and outputs the output signal to the next stage circuit. The output circuit 4 includes a second current transformer CT2, and three ports of the second current transformer CT2 are respectively connected in series in the three-phase circuit.
Referring to fig. 1 and 3, the output circuit 4 includes a three-phase output terminal and a neutral output terminal for forming a corresponding closed loop, respectively.
The output circuit 4 is also connected with a display circuit 6. The display circuit 6 includes an output display circuit 61 for displaying an output state and an input display circuit 62 for displaying an input state, respectively.
The output display circuit 61 is connected in parallel between the three-phase output end and the neutral line output end, and the output display circuit 61 comprises two output display lamps and a selection switch which are connected in series; the output display lamps are respectively set as an isolation output lamp and a bypass output lamp.
The selection switch is a single-pole double-throw switch, two moving ends of the selection switch are respectively connected with a first electric energy meter signal end DT1 and a second electric energy meter signal end DT2 in a signal mode, and the selection switch is integrated in the switch circuit 3 in the embodiment of the application. The output signals of the first and second power meter signal terminals DT1 and DT2 represent the isolated output state and the bypass output state, respectively.
The input display circuit 62 includes: the input display lamp and the 2A fuse are connected between the neutral line output end and the three-phase output end in series.
The implementation principle of the isolation transformer electrical circuit with the lightning protection and filtering functions in the embodiment of the application is as follows: the input circuit 1 is connected with a three-phase mains supply signal, an output signal of the input circuit 1 sequentially passes through a voltage conversion circuit 2 for voltage conversion, a switch circuit 3 for selecting a circuit circulation path and an output circuit 4 for current conversion, in the process, a lightning protection circuit 5 avoids damage of surge to other equipment in a loop, and a display circuit 6 displays the circulation state of the circuit in real time, so that uninterrupted power supply is guaranteed, and meanwhile, the safety is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. An isolation transformer electrical circuit having a lightning protection filtering function, comprising:
the input circuit (1) is connected with a mains supply input through signals and is used for accessing a mains supply;
the voltage conversion circuit (2) is in signal connection with the input circuit (1) and is used for performing voltage conversion on an output signal of the input circuit (1) and outputting the output signal;
the switching circuit (3) is respectively connected with the input circuit (1) and the voltage conversion circuit (2) in a signal mode and is used for gating the input circuit (1) and/or the voltage conversion circuit (2); and the number of the first and second groups,
and the output circuit (4) is in signal connection with the switch circuit (3), receives the output signal of the switch circuit (3), converts the current and outputs the current to the next stage of circuit.
2. The electrical circuit of the isolation transformer with the lightning protection and filtering function according to claim 1, wherein the input circuit (1) comprises a mains input, a first current transformer CT1 and a switch element which are connected in sequence by signals;
the mains supply input end is used for connecting a three-phase mains supply, a neutral line and the ground; the first current transformer CT1 is respectively connected with a three-phase mains supply input end through signals; the switch component is arranged as a first breaker QF1, and a three-phase circuit is arranged as the same as the first breaker QF 1.
3. An isolation transformer electrical circuit with lightning protection filtering function according to claim 2, characterized in that the voltage transformation circuit (2) is configured as an isolation transformer, the input of the isolation transformer is respectively connected with the three-phase circuit by signals, and the isolation transformer is respectively connected with the switch circuit (3) by signals.
4. The electrical circuit of the isolation transformer with lightning protection and filtering function according to claim 1, wherein the switch circuit (3) comprises a plurality of groups of single-pole double-throw switches, two moving ends of the single-pole double-throw switches are respectively connected with the input circuit (1) and the voltage conversion circuit (2) through signals, and a fixed end of the single-pole double-throw switches is connected with the output circuit (4) through signals.
5. The electrical circuit of the isolation transformer with lightning protection filtering function according to claim 2, characterized in that the output circuit (4) comprises a second current transformer CT2, the second current transformer CT2 being respectively arranged in a three-phase circuit.
6. The isolation transformer electrical circuit with lightning protection filtering function according to claim 2, characterized in that the input circuit (1) further comprises a lightning protection circuit (5), the lightning protection circuit (5) comprises a first lightning protector BY1 signal-connected to the mains input, and a second circuit breaker QF2 is connected in series between the first lightning protector BY1 and the mains input.
7. The isolation transformer electrical circuit with lightning protection filtering function according to claim 1, characterized in that said output circuit (4) comprises a three-phase output terminal and a neutral line output terminal, said output circuit (4) being signally connected to a display circuit (6);
the display circuit (6) includes:
the output display circuit (61) is connected between the three-phase output and the neutral line output in parallel, the output display circuit (6) comprises an output display lamp and a selection switch which are connected in series;
an input display circuit (62), an input display lamp connected in series between the neutral output terminal and the three-phase output terminal.
8. The electrical circuit of isolation transformer with lightning protection and filtering function according to claim 7, characterized in that said selection switch is integrated in said switch circuit (3) and is configured as a single-pole double-throw switch, and two moving terminals of said selection switch are respectively connected with a first power meter signal terminal DT1 and a second power meter signal terminal DT 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898217.2U CN213717850U (en) | 2020-12-02 | 2020-12-02 | Isolation transformer electrical circuit with lightning protection and filtering functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898217.2U CN213717850U (en) | 2020-12-02 | 2020-12-02 | Isolation transformer electrical circuit with lightning protection and filtering functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213717850U true CN213717850U (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022898217.2U Active CN213717850U (en) | 2020-12-02 | 2020-12-02 | Isolation transformer electrical circuit with lightning protection and filtering functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213717850U (en) |
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- 2020-12-02 CN CN202022898217.2U patent/CN213717850U/en active Active
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