CN211505756U - Wiring switching device and system for acquiring primary current under single-phase earth fault - Google Patents
Wiring switching device and system for acquiring primary current under single-phase earth fault Download PDFInfo
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- CN211505756U CN211505756U CN202020090120.6U CN202020090120U CN211505756U CN 211505756 U CN211505756 U CN 211505756U CN 202020090120 U CN202020090120 U CN 202020090120U CN 211505756 U CN211505756 U CN 211505756U
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Abstract
The utility model discloses an acquire primary current wiring auto-change over device and system under single-phase earth fault, including at least one in A looks structure, B looks structure and the C looks structure, A looks structure, B looks structure and C looks structure are the same, wherein, the structure is including simulation ground resistance R, single-pole double-throw high-voltage switch K1 and single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with the power line of the corresponding phase, and the fixed end of the K2 is switched between the left connecting end and the right connecting end; the movable end of the K1 is connected with relevant equipment on the power supply side, and the fixed end of the K1 is switched between the left connecting end and the right connecting end of the K1; the left connecting end that K1's motionless end corresponds adopts first ground connection mode ground connection, and the right connecting end that K1's motionless end corresponds adopts second ground connection mode ground connection. The utility model discloses need not untie the line that each looks once inclines when changing into another looks and taking place single-phase earth fault after can realizing that simulation single-phase earth fault takes place for one phase, only can realize the wiring transform through operation change over switch, improve test efficiency.
Description
Technical Field
The utility model relates to a power supply test technical field specifically, relates to acquire primary current wiring auto-change over device and system under single-phase earth fault.
Background
According to the regulations of relevant regulations in the power industry, when a single-phase earth fault occurs, the power distribution network system adopting the neutral point insulation mode can still operate for 2 hours in a live mode. The patent 'system and method for acquiring the metering performance of an electric energy metering device under single-phase earth fault' (application number: 201910281485.9) provides that a single-phase earth fault experimental platform is built under laboratory conditions, and the influence of the electric energy metering device on the electric energy metering of a user when the electric energy metering device is arranged at different positions is simulated. As shown in fig. 1, when a single-phase ground fault occurs (for example, when a single-phase ground fault occurs in the C-phase), a C-phase fault current flows from the ground to the line, and a capacitance current flows from the line to the ground in the a-phase and the B-phase, so that when a single-phase ground fault occurs in different phases, currents are different between the line and the ground.
The patent "system and method for obtaining the metering performance of the electric energy metering device under single-phase earth fault" (application number: 201910281485.9) proposes a wiring circuit for simulating each phase current in the single-phase earth fault shown in fig. 2. In the simulation test of single-phase earth fault in a laboratory, the wiring replacement according to the wiring of fig. 2 is complicated to simulate the single-phase earth fault of different phases, when the single-phase earth fault of one phase is simulated and then the single-phase earth fault of the other phase is simulated, the primary side wires of each phase need to be untied and then re-wired, because the primary wires are usually high-voltage insulated wires and have large current, the primary wires are usually heavy and inconvenient to move, and the wiring conversion process needs more time and seriously affects the test efficiency,
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model discloses a solve above-mentioned technical problem, the utility model discloses on the basis of figure 2, increase change over switch in each phase, do not need to untie the line that each looks once when taking place single-phase earth fault after realizing that simulation one phase takes place to change into another phase and take place single-phase earth fault, only can realize the wiring transform through operation change over switch, improve test efficiency.
In order to achieve the above object of the present invention, the present application provides a wiring switching device for obtaining a primary current under a single-phase ground fault, the device includes at least one of an a-phase structure, a B-phase structure and a C-phase structure, the a-phase structure, the B-phase structure and the C-phase structure are the same, wherein the structure includes a simulated ground resistance R, a single-pole double-throw high-voltage switch K1 and a single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with the power line of the corresponding phase, and the fixed end of the K2 is switched between the left connecting end and the right connecting end; the movable end of the K1 is connected with relevant equipment on the power supply side, and the fixed end of the K1 is switched between the left connecting end and the right connecting end of the K1; the left connecting end that K1's motionless end corresponds adopts first ground connection mode ground connection, and the right connecting end that K1's motionless end corresponds adopts second ground connection mode ground connection.
The structure of the phase A comprises a simulated ground resistor R, a single-pole double-throw high-voltage switch K1 and a single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with the A-phase power line, the other phase structure is correspondingly connected with the corresponding phase power supply, and the fixed end of the K2 is switched between the left connecting end and the right connecting end; the movable end of the K1 is connected with a power supply side current transformer T1, and the fixed end of the K1 is switched between the left connecting end and the right connecting end of the K1; one end of the analog grounding resistor R is grounded, the other end of the analog grounding resistor R is connected with the left connecting end corresponding to the fixed end of K1, the high-voltage end of the grounding capacitor is connected with the right connecting end corresponding to the fixed end of K1, and the low-voltage end of the grounding capacitor is grounded after being connected through phase adjustment.
Preferably, for a single-phase ground fault phase, the fixed end of the K1 is connected with the left connecting end thereof, so that the high-voltage end of the analog ground resistor R is connected with the T1; the fixed end of the K2 is connected with the right connecting end thereof, so that the high-voltage end of the ground capacitor C is connected with the circuit through the K1; for a non-single-phase ground fault phase, the fixed end of the K1 is connected with the right connecting end of the K1, so that the analog ground resistor R is in a suspension state and is not connected with a line; the fixed end of the K2 is connected with the left connecting end thereof, so that the high-voltage end of the ground capacitor C is connected with the mutual inductor T1.
The utility model also provides a system for acquire electric energy metering device measurement performance under single-phase earth fault, be equipped with auto-change over device in the system, auto-change over device includes at least one in A looks structure, B looks structure and the C looks structure, and A looks structure, B looks structure are the same with C looks structure, and wherein, the structure includes simulation ground resistance R, single-pole double-throw high-voltage switch K1 and single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with a corresponding phase power line, and the fixed end of the K2 comprises a left connecting end and a right connecting end; the movable end of the K1 is connected with related equipment on the power supply side, the fixed end of the K1 comprises a left connecting end and a right connecting end, and the right connecting end of the K2 is connected with the right connecting end of the K1; the left connecting end that K1's motionless end corresponds adopts first ground connection mode ground connection, and the right connecting end that K1's motionless end corresponds adopts second ground connection mode ground connection.
Preferably, the system is provided with a non-fault phase detection device and a fault phase detection device, the non-fault phase detection device and the fault phase detection device have the same structure, and the non-fault phase detection device comprises a power supply side current transformer T1, a current booster T2 and a load side current transformer T3; and the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop.
Preferably, one end of the current booster T2 in the non-fault phase detection device is connected with the A phase line; one end of the power supply side current transformer T1 is connected with a grounding capacitor CAThe high voltage end of (2).
Preferably, one end of the current booster T2 in the fault phase detection device is connected with a C-phase line; one end of the power supply side current transformer T1 is connected with one end of the switch K far away from the resistor R.
Preferably, the primary side of the current booster T2 is disposed on a line of a failed phase or a non-failed detection phase, and the secondary side of the current booster T2 is connected to the power supply side current transformer T1 and the load side current transformer T3.
Preferably, the iron core of the current booster T2 adopts a ring structure, and an input line passes through the inner ring of the ring structure.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the utility model discloses increase change over switch in each phase, realize that the line that each looks once does not need to untie when changing into another looks emergence single-phase earth fault after the single-phase earth fault takes place for a simulation looks, only can realize the wiring transform through operation change over switch, improve test efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic diagram of a single-phase ground fault experimental platform;
FIG. 2 is a schematic diagram of the system for obtaining the metering performance of the electric energy metering device under the condition of single-phase earth fault;
fig. 3 is a schematic diagram of the device of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and the scope of the present invention is not limited by the specific embodiments disclosed below.
Through research of the utility model, it can be seen that for the ungrounded phase (taking the phase a of fig. 2 as an example), the low-voltage end of the grounding capacitor is grounded, the high-voltage end is connected with one end of the phase a current transformer T1, and the other end of the phase a current transformer T1 is connected with the phase a line; as can be seen, for the grounding phase (taking the phase C in fig. 2 as an example), the low-voltage end of the grounding capacitor is grounded, the high-voltage end is connected to the phase C line, the low-voltage end of the resistor R in the case of the analog fault is grounded, the high-voltage end is connected to one end of the phase C current transformer T1, and the other end of the phase C current transformer T1 is connected to the phase C line; it can be seen that the main differences between the grounded and ungrounded phases are the capacitive and resistive connections (only the grounded phase has a ground resistance).
Through the analysis to each phase current and wiring under single-phase earth fault, the utility model discloses a design is as shown in fig. 3. Each phase is designed identically, and phase A is exemplified. Each phase is provided with a fault resistance and a ground capacitance branch when the phase is grounded, and two single-pole double-throw high-voltage switches K1 and a high-voltage switch K2 are added, and the connection is shown in figure 3. For a single-phase earth fault phase, K1 is arranged at the left end, so that the high-voltage end of the analog earth resistance R is connected with T1; k2 is arranged at the right end, so that the high-voltage end of the earth capacitor C is connected with the circuit through K1; for a non-single-phase earth fault phase, K1 is arranged at the right end, so that the analog earth resistance R is in a suspension state and is not connected with a line; k2 is placed at the left end, so that the high-voltage end of the capacitor C to ground is connected with the line. Through the design, the single-phase grounding condition of different phases can be conveniently simulated only through switching.
The utility model discloses the application is the improvement that is carried out the application of patent "acquire system and method (application number: 201910281485.9) of electric energy metering device measurement performance under single-phase earth fault", can refer to this open patent about the content introduction relevant with this patent, and the utility model discloses do not do corresponding unnecessary the repeated description.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The wiring switching device for obtaining primary current under the single-phase earth fault is characterized by comprising at least one of an A-phase structure, a B-phase structure and a C-phase structure, wherein the A-phase structure, the B-phase structure and the C-phase structure are the same, and the structures comprise a simulated earth resistance R, a single-pole double-throw high-voltage switch K1 and a single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with a corresponding phase power line, and the fixed end of the K2 comprises a left connecting end and a right connecting end; the movable end of the K1 is connected with related equipment on the power supply side, the fixed end of the K1 comprises a left connecting end and a right connecting end, and the right connecting end of the K2 is connected with the right connecting end of the K1; the left connecting end that K1's motionless end corresponds adopts first ground connection mode ground connection, and the right connecting end that K1's motionless end corresponds adopts second ground connection mode ground connection.
2. The connection switching device for obtaining primary current under single-phase ground fault according to claim 1, wherein a moving end of a K1 is connected with a power supply side current transformer T1, one end of a simulated ground resistor R is grounded, the other end of the simulated ground resistor R is connected with a left connecting end corresponding to a fixed end of a K1, a high-voltage end of a ground capacitor is connected with a right connecting end corresponding to the fixed end of the K1, and a low-voltage end of the ground capacitor is grounded after being connected through phase adjustment.
3. The connection switching device for obtaining primary current under single-phase earth fault according to claim 2, characterized in that, for single-phase earth fault phase, the fixed end of K1 is connected with its left connection end, so that the high voltage end of the analog earth resistance R is connected with T1; the fixed end of the K2 is connected with the right connecting end thereof, so that the high-voltage end of the ground capacitor C is connected with the circuit through the K1; for a non-single-phase ground fault phase, the fixed end of the K1 is connected with the right connecting end of the K1, so that the analog ground resistor R is in a suspension state and is not connected with a line; the fixed end of the K2 is connected with the left connecting end thereof, so that the high-voltage end of the ground capacitor C is connected with the mutual inductor T1.
4. The system for obtaining the metering performance of the electric energy metering device under the single-phase earth fault is characterized in that a switching device is arranged in the system, the switching device comprises at least one of an A-phase structure, a B-phase structure and a C-phase structure, the A-phase structure, the B-phase structure and the C-phase structure are the same, and the structures comprise a simulated earth resistance R, a single-pole double-throw high-voltage switch K1 and a single-pole double-throw high-voltage switch K2; the movable end of the K2 is connected with a corresponding phase power line, and the fixed end of the K2 comprises a left connecting end and a right connecting end; the movable end of the K1 is connected with related equipment on the power supply side, the fixed end of the K1 comprises a left connecting end and a right connecting end, and the right connecting end of the K2 is connected with the right connecting end of the K1; the left connecting end that K1's motionless end corresponds adopts first ground connection mode ground connection, and the right connecting end that K1's motionless end corresponds adopts second ground connection mode ground connection.
5. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault according to claim 4, characterized in that a non-fault phase detection device and a fault phase detection device are arranged in the system, the non-fault phase detection device and the fault phase detection device are identical in structure, and the non-fault phase detection device comprises a power supply side current transformer T1, a current booster T2 and a load side current transformer T3; and the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop.
6. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault according to claim 5, wherein one end of a current booster T2 in the non-fault phase detection device is connected with an A-phase line; one end of the power supply side current transformer T1 is connected with a grounding capacitor CAThe high voltage end of (2).
7. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault according to claim 5, wherein one end of a current booster T2 in the fault phase detection device is connected with a C-phase line; one end of the power supply side current transformer T1 is connected with one end of the switch K far away from the resistor R.
8. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault as recited in claim 5, wherein the primary side of the current booster T2 is arranged on a line of a fault phase or a non-fault detection phase, and the secondary side of the current booster T2 is connected with a power supply side current transformer T1 and a load side current transformer T3.
9. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault according to claim 5, wherein the iron core of the current booster T2 is of an annular structure, and an input line passes through the inner ring of the annular structure.
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| CN202020090120.6U CN211505756U (en) | 2020-01-15 | 2020-01-15 | Wiring switching device and system for acquiring primary current under single-phase earth fault |
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| CN202020090120.6U CN211505756U (en) | 2020-01-15 | 2020-01-15 | Wiring switching device and system for acquiring primary current under single-phase earth fault |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077412A (en) * | 2020-01-15 | 2020-04-28 | 国网四川省电力公司电力科学研究院 | Wiring switching device, system and method for acquiring primary current under single-phase earth fault |
| CN113345782A (en) * | 2021-05-28 | 2021-09-03 | 武汉联影医疗科技有限公司 | Cathode emission device for an X-ray tube, high-voltage cable and method |
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2020
- 2020-01-15 CN CN202020090120.6U patent/CN211505756U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077412A (en) * | 2020-01-15 | 2020-04-28 | 国网四川省电力公司电力科学研究院 | Wiring switching device, system and method for acquiring primary current under single-phase earth fault |
| CN113345782A (en) * | 2021-05-28 | 2021-09-03 | 武汉联影医疗科技有限公司 | Cathode emission device for an X-ray tube, high-voltage cable and method |
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