CN112542077B - Nuclear phase teaching box - Google Patents
Nuclear phase teaching box Download PDFInfo
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- CN112542077B CN112542077B CN202011446141.8A CN202011446141A CN112542077B CN 112542077 B CN112542077 B CN 112542077B CN 202011446141 A CN202011446141 A CN 202011446141A CN 112542077 B CN112542077 B CN 112542077B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/183—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
Abstract
The invention discloses a nuclear phase teaching box which comprises an internal circuit arranged in a box body and an external panel positioned outside the box body, wherein the internal circuit comprises a three-phase power supply converter and at least two paths of simulation nuclear phase circuits, the three-phase power supply converter is used for converting an input single-phase power supply into a three-phase power supply, each path of simulation nuclear phase circuit comprises a voltage reducer for reducing the voltage of the three-phase power supply to a preset voltage, each path of simulation nuclear phase circuit comprises three nuclear phase holes respectively corresponding to the three-phase power supply after voltage reduction, at least one path of simulation nuclear phase circuit comprises a first voltage state controller used for converting the connection mode of the three-phase power supply circuit after the voltage reducer, the external panel comprises at least two nuclear phase test areas, each nuclear phase test area corresponds to one path of simulation nuclear phase circuit, and each nuclear phase test area comprises three nuclear phase test holes respectively connected with the nuclear phase holes in the corresponding simulation nuclear phase circuit. The nuclear phase teaching box disclosed by the embodiment of the invention can realize secondary nuclear phase teaching and improve the nuclear phase teaching efficiency.
Description
Technical Field
The embodiment of the invention relates to an electric power technology, in particular to a nuclear phase teaching box.
Background
With the development of automation technology, the automation of power grid distribution network has become mature day by day. However, while the equipment is continuously improved, new requirements are also put forward for new equipment operation and maintenance personnel. The phase checking is an important experiment in a power system, and the power grid can perform operations such as switching power transmission, synchronization and the like only after the phase checking is correct, otherwise serious consequences such as non-synchronization switching-on, protection misoperation, motor insulation breakdown and the like can be generated.
The phase checking is to check whether the phases of the voltages on the two wires with the same name are the same. The nuclear phase operation is divided into a primary nuclear phase and a secondary nuclear phase, wherein the primary nuclear phase adopts a primary nuclear phase rod to check phase angles of two phases at a primary side respectively, and the phase angles are compared with a secondary device to check phase sequence. And the secondary phase checking is to check a phase sequence on a secondary side of a Potential Transformer (PT) by adopting a secondary phase checking instrument after the primary system transmits power. The primary nuclear phase and the secondary nuclear phase need to be matched for use.
In order to ensure the safety of the power grid, operation and maintenance personnel need to be subjected to phase checking teaching and then can be put on duty. However, at present, the secondary nuclear phase operation can only be performed under the operation condition of the cable distribution box, and the homologous and heterologous nuclear phases inevitably need an operation switch, so that teaching can not be performed at any time under the condition, and the operation and maintenance safety of a power grid is not facilitated.
Disclosure of Invention
The invention provides a nuclear phase teaching box which can realize secondary nuclear phase teaching and improve the efficiency of nuclear phase teaching.
In a first aspect, an embodiment of the present invention provides a nuclear phase teaching box, including: the box body, the outer panel and the internal circuit;
the internal circuit is positioned inside the box body, and the outer panel is positioned on one side outside the box body;
the internal circuit comprises a three-phase power converter and at least two paths of simulation nuclear phase circuits, the three-phase power converter is used for converting an input single-phase power into a three-phase power and then respectively inputting the three-phase power into the at least two paths of simulation nuclear phase circuits, each path of simulation nuclear phase circuit comprises a voltage reducer used for reducing the voltage of the three-phase power to a preset voltage, each path of simulation nuclear phase circuit comprises three nuclear phase holes respectively corresponding to the three-phase power after voltage reduction, and at least one path of simulation nuclear phase circuit comprises a first voltage state controller used for converting the connection mode of the three-phase power circuit after the voltage reducer;
the outer panel comprises at least two nuclear phase test areas, each nuclear phase test area corresponds to one path of simulated nuclear phase circuit, and each nuclear phase test area comprises three nuclear phase test holes respectively connected with the nuclear phase holes in the corresponding simulated nuclear phase circuit.
In a possible implementation form of the first aspect, the analog nuclear phase circuit including the first voltage state controller includes a second voltage state controller for converting a three-phase power line connection form before the step-down transformer.
In a possible implementation manner of the first aspect, the three-phase power converter is connected to a comparison analog core phase circuit that does not include the first voltage state controller and the second voltage state controller through a first switch, and a comparison analog core phase circuit that includes the second voltage state controller is connected to the comparison analog core phase circuit through a second switch and a third switch.
In a possible implementation manner of the first aspect, the first switch, the second switch and the third switch have a linkage mechanism, and the linkage mechanism is used for controlling the first switch, the second switch and the third switch to be incapable of being closed simultaneously under the conditions of bilateral asynchronism.
In a possible implementation manner of the first aspect, the outer panel further includes at least two circuit switch indicator lights, and the internal circuit further includes a buzzer;
when the first switch, the second switch and the third switch are simultaneously closed under the condition of synchronous two sides, the indicator lamps of the at least two circuit switches indicate that the loop closing is successful; when the first switch, the second switch and the third switch close the last switch under the condition of different periods at two sides, at least two circuit switch indicator lamps indicate that the loop closing fails, and the buzzer gives an alarm.
In a possible implementation manner of the first aspect, the preset voltage is lower than the human body safety voltage.
In a possible implementation manner of the first aspect, the three-phase power converter is configured to convert a single-phase power input by a direct-current power source or an alternating-current power source into a three-phase power.
In a possible implementation manner of the first aspect, each nuclear phase test area further includes indicator lights respectively corresponding to the charged states of the three-phase power lines in the corresponding analog nuclear phase circuit.
In a possible implementation manner of the first aspect, the outer panel further includes at least two color-changeable lamps, each color-changeable lamp corresponds to one of the analog phasing circuits, and each color-changeable lamp changes a lighting color according to a state of the corresponding analog phasing circuit.
In a possible implementation manner of the first aspect, the external panel further includes status switches corresponding to the first voltage status controller and the second voltage status controller.
In a possible implementation manner of the first aspect, the outer panel further includes control switches corresponding to the first switch, the second switch, and the third switch.
The invention provides a nuclear phase teaching box which comprises an internal circuit and an external panel, wherein the internal circuit is arranged in a box body, the external panel is positioned outside the box body, the internal circuit comprises a three-phase power converter and at least two paths of simulated nuclear phase circuits, the three-phase power converter is used for converting an input single-phase power into a three-phase power, each path of simulated nuclear phase circuit comprises a voltage reducer for reducing the three-phase power to a preset voltage, each path of simulated nuclear phase circuit comprises three nuclear phase holes respectively corresponding to the three-phase power after voltage reduction, at least one path of simulated nuclear phase circuit comprises a first voltage state controller for converting the connection mode of the three-phase power circuit after the voltage reducer, the external panel comprises at least two nuclear phase test areas, each nuclear phase test area corresponds to one path of simulated nuclear phase circuit, each nuclear phase test area comprises three nuclear phase test holes respectively connected with the nuclear phase holes in the corresponding simulated nuclear phase circuit, and the connection mode of the three-phase power circuit of the simulated nuclear phase circuit can be controlled through the first voltage state controller positioned on the secondary side, so that a learner can carry out secondary nuclear phase test through setting different phase states of the simulated nuclear phase circuits, and the nuclear phase test efficiency of the nuclear phase on the external panel is improved.
Drawings
Fig. 1 is a schematic structural diagram of a nuclear phase teaching box according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an internal circuit of a nuclear phase teaching box according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an outer panel of a nuclear phase teaching box according to an embodiment of the present invention;
fig. 4 is another schematic structural diagram of an internal circuit of a nuclear phase teaching box according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of an external panel of a nuclear phase teaching box according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
Fig. 1 is a schematic structural diagram of a nuclear phase teaching box according to an embodiment of the present invention, and as shown in fig. 1, the nuclear phase teaching box according to this embodiment includes: a case 11, an outer panel 13, and an internal circuit 12.
In which the internal circuit 12 is located inside the case 11 and the external panel 13 is located on the side outside the case 11. The nuclear phase teaching phase is used for teaching and training power grid operation and maintenance personnel, and the operation and maintenance personnel can determine whether a circuit has a fault and position the fault type and position after testing through the nuclear phase instrument by setting different circuit connection states or faults. Therefore, the nuclear phase teaching phase needs to have an internal circuit 12 capable of adjusting different working states and an external panel 13 for displaying and providing a nuclear phase test port, and the box body 11 can be a light-tight closed box body, so that the situation that a user sees the internal circuit 12 in the box body 11 through the box body is avoided.
Fig. 2 is a schematic structural diagram of an internal circuit of a nuclear phase teaching box according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of an external panel of the nuclear phase teaching box according to an embodiment of the present invention. As shown in fig. 2 and 3.
The internal circuit 12 includes a three-phase power converter 21 and at least two analog core phase circuits, which are exemplified by two analog core phase circuits, a first analog core phase circuit 22 and a second analog core phase circuit 23 in the present embodiment. The three-phase power converter 21 is configured to convert an input single-phase power into a three-phase power and then input the three-phase power into the first analog core-phase circuit 22 and the second analog core-phase circuit 23, where the first analog core-phase circuit 22 includes a voltage reducer 24, the second analog core-phase circuit 23 includes a voltage reducer 25, and the voltage reducer 24 and the voltage reducer 25 are configured to reduce the three-phase power to a preset voltage. The first simulation nuclear phase circuit 22 and the second simulation nuclear phase circuit 23 both include three nuclear phase holes corresponding to the three-phase power supply after voltage reduction, wherein the three nuclear phase holes of the first simulation nuclear phase circuit 22 are a, B, and C, and the three nuclear phase holes of the second simulation nuclear phase circuit 23 are D, E, and F. The first analog core phase circuit 22 includes a first voltage state controller 26 after the buck converter for converting the three-phase power line connection. The internal circuit 12 may be provided on one circuit board or may be implemented by connecting a plurality of devices by wires.
The three-phase power converter 21 may convert a single-phase power input from a dc power or an ac power into a three-phase power. That is to say, the nuclear phase teaching box that this embodiment provided can be applicable to direct current power input also can be applicable to alternating current power input. The dc power source may be a battery, and the ac power source may be 220V commercial power.
The outer panel 13 includes at least two nuclear phase test areas, each of which corresponds to one of the analog nuclear phase circuits. In the present embodiment, the first core phase region 31 corresponds to the first analog core phase circuit 22, and the second core phase region corresponds to the second analog core phase circuit 23. The first nuclear phase region 31 includes three nuclear phase test holes a, B, C correspondingly connected to the nuclear phase holes a, B, C of the first analog nuclear phase circuit 22, respectively; the second nuclear phase region 32 includes three nuclear phase test holes D, E, and F respectively connected to the nuclear phase holes D, E, and F of the second analog nuclear phase circuit 23. The outer panel 13 may be one side panel of the cabinet 11, or the outer panel 13 may be a separate panel disposed on one side panel of the cabinet 11. The outer panel 13 may include other characters for identification, such as identification of each nuclear phase test area and three nuclear phase test holes in each nuclear phase test area, in addition to the nuclear phase test areas.
Since the first analog core phase circuit 22 in the internal circuit 12 includes the first voltage state controller 26, the connection manner of the three-phase power supply of the first analog core phase circuit 22 can be changed by the first voltage state controller 26, for example, lines connecting the core phase holes a, B, and C are respectively reversed. The phase of the three-phase power of the first analog core phase circuit 22 can be adjusted as required, and the phase of the three-phase power of the second analog core phase circuit 23 is the same as the phase of the three-phase power output by the power converter 21 because the second analog core phase circuit 23 is directly connected to the three-phase power converter 21. Therefore, the three-phase power supply phases of the first simulation nuclear phase circuit 22 and the second simulation nuclear phase circuit 23 can have various different combination conditions, and for nuclear phase teaching, a teacher can set different three-phase power supply phases of the first simulation nuclear phase circuit 22, so that the nuclear phase testing holes a, b and c and the nuclear phase testing holes d, e and f of the outer panel 13 of the teacher can be tested by using a nuclear phase tester, and the purpose of nuclear phase testing teaching is achieved. Since the first voltage state controller 26 is located behind the voltage reducer 24, i.e., on the secondary side, the nuclear phase teaching box provided in this embodiment implements teaching of secondary nuclear phase.
The voltage reducer 24 arranged in the first simulation nuclear phase circuit 22 and the voltage reducer 25 arranged in the second simulation nuclear phase circuit 23 are used for changing three-phase voltage from primary to secondary, and meanwhile, the preset voltage reduced by the voltage reducer 24 and the voltage reducer 25 can be determined according to test requirements. Preferably, the preset voltage may be lower than a human body safety voltage, for example, the preset voltage may be 36V or lower than 36V. Or the preset voltage may be set according to parameters of a nuclear phase tester performing a nuclear phase operation.
The nuclear phase teaching box provided by the embodiment comprises an internal circuit arranged in a box body and an external panel positioned outside the box body, wherein the internal circuit comprises a three-phase power converter and at least two paths of simulation nuclear phase circuits, the three-phase power converter is used for converting an input single-phase power into a three-phase power, each path of simulation nuclear phase circuit comprises a voltage reducer for reducing the voltage of the three-phase power to a preset voltage, each path of simulation nuclear phase circuit comprises three nuclear phase holes respectively corresponding to the three-phase power after voltage reduction, at least one path of simulation nuclear phase circuit comprises a first voltage state controller for converting the connection mode of the three-phase power circuit after the voltage reducer, the external panel comprises at least two nuclear phase test areas, each nuclear phase test area corresponds to one path of simulation nuclear phase circuit, each nuclear phase test area comprises three nuclear phase test holes respectively connected with the nuclear phase holes in the corresponding simulation nuclear phase circuit, the connection mode of the three-phase power circuit of one path of simulation nuclear phase circuit can be controlled through the first voltage state controller positioned on the secondary side, therefore, the phase states of different simulation nuclear phase circuits can be set, learners can realize the nuclear phase test on the external panel, and the nuclear phase teaching efficiency is improved.
Fig. 4 is another schematic structural diagram of an internal circuit of a nuclear phase teaching box according to an embodiment of the present invention, and as shown in fig. 4, the internal circuit provided in this embodiment is based on the embodiment shown in fig. 2, and the first analog nuclear phase circuit 22 further includes a second voltage state controller 27 for converting a connection manner of a three-phase power line before the step-down transformer 24.
The second voltage state controller 27 is used to change the connection of the three-phase power supply line before the step-down transformer 24, that is, to change the phase of the three-phase power supply on the primary side. Then, the nuclear phase teaching box with the internal circuit provided by this embodiment can transform the phase at both the primary side and the secondary side, and thus can implement the nuclear phase teaching at both the primary side and the secondary side. As shown in the figure, the second voltage state controller 27 is disposed behind the connection point between the three-phase power converter 21 and the second analog core phase circuit 23, that is, the phase of the second analog core phase circuit 23 is the same as the phase of the three-phase power input by the three-phase power converter 21.
Alternatively, on the internal circuit 12, the three-phase power converter 21 and the second analog core phase circuit 23 are connected by the first switch 28, and the first analog core phase circuit 22 is connected to the second analog core phase circuit 23 by the second switch 29 and the third switch 20. That is, the three-phase power converter 21 is connected to the analog core phase circuit excluding the first voltage state controller and the second voltage state controller through the first switch, which is referred to as a comparative analog core phase circuit. And an analog phase-checking circuit comprising a second voltage state controller is connected with the comparison analog phase-checking circuit through a second switch and a third switch. Wherein the first analog core phase circuit 22 is connected to the second analog core phase circuit 23 after the second voltage controller via the second switch 29 and the third switch 20, as shown.
After the first switch 28, the second switch 29 and the third switch 20 are arranged, different simulation nuclear phase circuits can be in a conducting state through controlling the first switch 28, the second switch 29 and the third switch 20, so that the diversity of simulation events of the nuclear phase teaching box is further increased, and the nuclear phase teaching effect is improved.
In addition, after the first switch 28, the second switch 29, and the third switch 20 are provided, a chain mechanism (not shown) may be provided among the first switch 28, the second switch 29, and the third switch 20. The interlock mechanism is used to control the first switch 28, the second switch 29 and the third switch 20 not to be closed simultaneously in the case of double-sided asynchronism. The interlocking mechanism can be a mechanical structure or can be realized through a circuit.
In addition, in one embodiment, the outer panel 13 further includes at least two circuit switch indicator lights, and the internal circuit 12 further includes a buzzer; when the first switch 28, the second switch 29 and the third switch 20 are simultaneously closed under the condition of double-side synchronization, at least two circuit switch indicator lamps indicate that loop closing is successful; when the first switch 28, the second switch 29 and the third switch 20 close the last switch under the condition of double-side different phases, at least two circuit switch indicator lamps indicate that the loop closing fails, and a buzzer alarms. Wherein, at least two circuit switch indicator lamps can light up green light for indicating that the loop closing is successful, and at least two circuit switch indicator lamps can light up red light for indicating that the loop closing is failed. In the embodiment of the present invention, two analog nuclear phase circuits are taken as an example, and two circuit switch indicator lights are included on the external panel, that is, the circuit switch indicator lights are respectively used for indicating the switch states of the two analog nuclear phase circuits.
Fig. 5 is another schematic structural diagram of an external panel of a nuclear phase teaching box according to an embodiment of the present invention, and as shown in fig. 5, an internal circuit provided in this embodiment is based on the embodiment shown in fig. 3, and each nuclear phase test area in the external panel 13 further includes indicator lights respectively corresponding to the charged states of three-phase power lines in a corresponding analog nuclear phase circuit.
The first nuclear phase test area 31 includes indicator lights a1, B1, C1 corresponding to the three-phase power lines in the first analog nuclear phase circuit 22, and a1, B1, C1 correspond to the charged states of the three-phase power lines corresponding to the nuclear phase holes a, B, C. And if the three-phase power supply lines corresponding to the core phase holes A, B and C are electrified, the corresponding indicator lamps a1, B1 and C1 are correspondingly lightened, and if the three-phase power supply lines are not electrified, the corresponding indicator lamps are extinguished. Similarly, the second nuclear phase test area 32 includes indicator lights D1, E1, F1, D1, E1, F1 corresponding to the three-phase power lines in the second analog nuclear phase circuit 23, respectively, corresponding to the charged states of the three-phase power lines corresponding to the nuclear phase holes D, E, F, respectively. And if the three-phase power supply lines corresponding to the phase checking holes D, E and F are electrified, the corresponding indicator lamps D1, E1 and F1 are correspondingly lightened, and if the three-phase power supply lines are not electrified, the corresponding indicator lamps are extinguished. Through set up the pilot lamp that corresponds in the three-phase power supply line live state of the simulation nuclear phase circuit that corresponds on outer panel 13, can find out the live state of each phase circuit directly perceivedly on the outer panel of nuclear phase teaching case, avoid appearing the accident in nuclear phase teaching, also can improve teaching efficiency.
Optionally, if a plurality of switches are disposed in the internal circuit 12 as shown in fig. 4, the first analog phase checking circuit 22 and the second analog phase checking circuit 23 may be in a connected state or in a disconnected state, and in order to intuitively embody the on-off state of each analog phase checking circuit, at least two color-changeable lamps may be further disposed on the external panel 13, each color-changeable lamp corresponds to one analog phase checking circuit, and each color-changeable lamp changes the color of the bright lamp according to the state of the corresponding analog phase checking circuit. As shown in fig. 5, the outer panel 13 is provided with a first variable color lamp 33 corresponding to the first analog phase checking circuit 22 and a second variable color lamp 34 corresponding to the second analog phase checking circuit 23. The first color-changeable lamp 33 and the second color-changeable lamp 34 change the color of the light according to the state of the corresponding analog phase-checking circuit, for example, when the first analog phase-checking circuit 22 is in the power-on state, the first color-changeable lamp 33 lights the red light, and when the first analog phase-checking circuit 22 is in the power-off state, the first color-changeable lamp 33 lights the green light. Similarly, when the second analog phase-checking circuit 23 is in the power-on state, the second variable color lamp 34 is turned on to emit red light, and when the second analog phase-checking circuit 23 is in the power-off state, the second variable color lamp 34 is turned on to emit green light. Through the color-changeable lamp tubes which are arranged on the outer panel 13 and correspond to the electrified states of the three-phase power lines of the corresponding simulation nuclear phase circuits, the electrified states of the simulation nuclear phase circuits can be visually seen on the outer panel of the nuclear phase teaching box, accidents in the nuclear phase teaching are avoided, and the teaching efficiency can be improved.
Alternatively, if a plurality of switches are provided in the internal circuit 12 as shown in fig. 4, the outer panel 13 may also be provided with control switches corresponding to the first switch 28, the second switch 29, and the third switch 20. As shown in fig. 5, the switch includes a first control switch 35 corresponding to the first switch 28, a second control switch 36 corresponding to the second switch 29, and a third control switch 37 corresponding to the third switch 20. The on-off state of each simulation nuclear phase circuit can be controlled outside the nuclear phase teaching box, and the nuclear phase teaching efficiency is improved.
Optionally, a status switch 38 corresponding to the first voltage status controller 26 and the second voltage status controller 27 may also be provided on the outer panel 13. When only the first voltage state controller 26 is provided in the internal circuit 12, the state switch 38 corresponds only to the first voltage state controller 26. When the first voltage state controller 26 and the second voltage state controller 27 are simultaneously provided in the internal circuit 12, the state switch 38 may correspond to the first voltage state controller 26 and the second voltage state controller 27 at the same time. The state switch 38 can directly control various controllable states of the first voltage state controller 26 and/or the second voltage state controller 27, so that the setting of different nuclear phase states can be directly realized on the outer panel 13 of the nuclear phase teaching box without setting each voltage state controller in the internal circuit 12. The status switch 38 may be any type of switch, such as a push button type status switch shown in FIG. 5 that directly corresponds to the different connection states. In fig. 5, "AB is connected inversely to" BC is connected inversely to "AC" respectively represent connection states of phase lines corresponding to the respective core phase holes.
It should be noted that the nuclear phase teaching box provided in each of the above embodiments has been described by taking only two analog nuclear phase circuits as an example. However, the number of the simulated nuclear phase circuits in the nuclear phase teaching box provided by the embodiment of the invention can be more than two, and correspondingly, the external panel is also provided with nuclear phase test areas respectively corresponding to the more than two simulated nuclear phase circuits. By arranging different voltage state controllers and switches in the plurality of simulated nuclear phase circuits, complex phase combination among the plurality of different simulated nuclear phase circuits can be realized, various possible phase combination conditions in a complex power grid environment can be simulated, and simulated nuclear phase teaching is facilitated.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A nuclear phase teaching box, comprising: the box body, the outer panel and the internal circuit;
the internal circuit is positioned inside the box body, and the external panel is positioned on one side outside the box body;
the internal circuit comprises a three-phase power converter and at least two paths of simulation nuclear phase circuits, the three-phase power converter is used for converting an input single-phase power into a three-phase power and then respectively inputting the three-phase power into the at least two paths of simulation nuclear phase circuits, each path of simulation nuclear phase circuit comprises a step-down device used for reducing the voltage of the three-phase power to a preset voltage, each path of simulation nuclear phase circuit comprises three nuclear phase holes respectively corresponding to the three-phase power after voltage reduction, at least one path of simulation nuclear phase circuit comprises a first voltage state controller used for converting the connection mode of a three-phase power line after the step-down device, and the simulation nuclear phase circuit of the first voltage state controller comprises a second voltage state controller used for converting the connection mode of the three-phase power line before the step-down device;
the second voltage state controller is used for converting the phase of the three-phase power supply on the primary side; the first voltage state controller is used for converting the phase of the three-phase power supply on the secondary side;
the outer panel comprises at least two nuclear phase test areas, each nuclear phase test area corresponds to one path of simulated nuclear phase circuit, and each nuclear phase test area comprises three nuclear phase test holes respectively connected with the nuclear phase holes in the corresponding simulated nuclear phase circuit.
2. The nuclear phase teaching box of claim 1 wherein the three-phase power converter is connected to a comparative analog nuclear phase circuit that does not include the first voltage state controller and the second voltage state controller through a first switch, and an analog nuclear phase circuit that includes the second voltage state controller is connected to the comparative analog nuclear phase circuit through a second switch and a third switch.
3. A nuclear facies teaching box as claimed in claim 2 wherein the first switch, the second switch and the third switch have a linkage for controlling the first switch, the second switch and the third switch to fail to close simultaneously in two different phases.
4. The nuclear phase teaching box according to claim 3, wherein the outer panel further comprises at least two circuit switch indicator lights, and the internal circuit further comprises a buzzer;
when the first switch, the second switch and the third switch are simultaneously closed under the condition of double-side synchronization, the at least two circuit switch indicator lamps indicate that loop closing is successful; when the first switch, the second switch and the third switch close the last switch under the condition of different periods of two sides, the at least two circuit switch indicator lamps indicate that the loop closing fails, and the buzzer gives an alarm.
5. A nuclear phase teaching box according to any one of claims 1 to 3 wherein the predetermined voltage is lower than the human safe voltage.
6. A nuclear phase teaching box according to any one of claims 1 to 3 wherein each nuclear phase test area further includes indicator lights corresponding to the respective live states of the three-phase power supply lines in the corresponding simulated nuclear phase circuit.
7. A nuclear phase teaching box according to any one of claims 1 to 3 wherein the outer panel further includes at least two color-changeable lamps, each color-changeable lamp corresponding to one of the simulated nuclear phase circuits, each color-changeable lamp changing the color of the bright light according to the state of the corresponding simulated nuclear phase circuit.
8. A nuclear phase teaching box according to any one of claims 1 to 3 wherein the external panel further includes status switches corresponding to the first voltage status controller and the second voltage status controller.
9. A nuclear phase teaching box according to claim 2 or 3, wherein the outer panel further includes control switches corresponding to the first switch, the second switch and the third switch.
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