CN219477255U - Connection mode of grounding transformer and neutral point resistor cabinet - Google Patents
Connection mode of grounding transformer and neutral point resistor cabinet Download PDFInfo
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- CN219477255U CN219477255U CN202320230760.6U CN202320230760U CN219477255U CN 219477255 U CN219477255 U CN 219477255U CN 202320230760 U CN202320230760 U CN 202320230760U CN 219477255 U CN219477255 U CN 219477255U
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Abstract
The utility model discloses a connection mode of a grounding transformer and neutral point resistor cabinet, which comprises an insulating tube bus, a wire inlet cabinet bus, a main transformer wire inlet cabinet and the grounding transformer and neutral point resistor cabinet, wherein the insulating tube bus is connected with an upper wiring terminal of the wire inlet cabinet bus, the wire inlet cabinet bus penetrates from the top of the main transformer wire inlet cabinet, a lower wiring terminal of the wire inlet cabinet bus is connected with a resistor cabinet connection cable, and the resistor cabinet connection cable penetrates from the bottom of the main transformer wire inlet cabinet and is connected with a grounding resistor in the grounding transformer and neutral point resistor cabinet, and a lower wiring terminal of the wire inlet cabinet bus is also connected with a wire inlet of the main transformer cabinet. The utility model fully utilizes the upper and lower outgoing terminals of the main transformer incoming line cabinet to be respectively led to the low-voltage side of the main transformer, the grounding transformer and the neutral point resistance cabinet, does not damage the insulation of the insulating tubular bus, omits a grounding switch cabinet special for the grounding transformer and the neutral point resistance cabinet, and simultaneously, the equipment permanently does not lose the neutral point protection, thereby reducing the manufacturing cost and increasing the safety and the reliability of the equipment.
Description
Technical field:
the utility model relates to the field of electric power, in particular to a connection mode of a grounding transformer and neutral point resistor cabinet.
The background technology is as follows:
the initial stages of 6kV, 10kV and 35kV power grids in the power system generally adopt an operation mode that neutral points are not grounded because of smaller capacitance current, so that the low-voltage side of a main transformer in the power grid is generally in a triangle connection method, no neutral points which can be grounded are arranged, when a single-phase grounding fault occurs in the neutral point non-grounding power grid system, the line voltage triangle still keeps symmetrical, the power system can still continuously supply power to users for 1 to 2 hours, the capacitance current is smaller (less than 10A), intermittent electric arcs cannot be caused, and some transient grounding faults can disappear by themselves.
However, as urban power grids are continuously expanded and cable outgoing lines are continuously increased, capacitance current of a system to ground is rapidly increased, capacitance current flowing through fault points after single-phase grounding is larger (more than 10A), electric arcs are not easy to extinguish, ferromagnetic resonance is easy to excite, overvoltage and intermittent arc grounding overvoltage are generated, insulation damage is possibly caused, and a line is tripped and an accident is expanded. In order to avoid the expansion of accidents, a compensating device such as an arc suppression coil needs to be arranged at the neutral point of the transformer, so that a neutral point needs to be artificially established to be connected with equipment such as the arc suppression coil, a resistor and the like. However, the grounding of the neutral point through the arc suppression coil has more problems, such as: the industrial frequency overvoltage is high, the operation overvoltage level is high, the resonance overvoltage is easy to generate, the electrical insulation level is required to be high, the accident rate of the zinc oxide lightning arrester is high, the out-of-phase break is easy to occur, the capacity expansion and tracking are inconvenient, and the like. The electric network with the grounded resistor can avoid the defects existing in the arc suppression coil grounding mode, the neutral point is grounded through the resistor to inject resistive current into the fault point, so that the grounded fault current has resistance-capacitance property, the phase difference angle of voltage is reduced, the re-burning rate after zero-crossing arc extinction of the fault point current is reduced, when the resistive current is large enough, the re-burning can not occur any more, and the zero-sequence protection sensitivity can be improved when the resistive current is larger than the capacitive current so as to act on tripping.
The currently used grounding transformer and neutral point resistor cabinet is connected by an insulating tube bus or through a switch in the switch cabinet, and the T-connection mode of the insulating tube bus breaks the insulating property of the original insulating tube bus, so that the safety and reliability of equipment are reduced, the service life of the equipment is influenced, and the complexity of a connection process is increased; also increasing the complexity of the connection process; through equipment such as switch in the cubical switchboard with cable coupling, need increase the cubical switchboard, can lead to the electricity distribution room area increase, increased the investment of equipment and land simultaneously, if the switchgear damages or malfunction has the risk of losing neutral point protection moreover.
The utility model comprises the following steps:
the utility model aims to provide a connection mode of a grounding transformer and a neutral point resistor cabinet.
The utility model is implemented by the following technical scheme:
the utility model provides a connection mode of ground connection change and neutral point resistance cabinet, includes insulating tubular busbar, inlet wire cabinet busbar, main inlet wire cabinet and ground connection change and neutral point resistance cabinet, insulating tubular busbar with the last binding post of inlet wire cabinet busbar is connected, the inlet wire cabinet busbar is followed main inlet wire cabinet top penetrates, the lower binding post of inlet wire cabinet busbar is through being connected with resistance cabinet connecting cable, resistance cabinet connecting cable follow main inlet wire cabinet bottom wear out and with ground connection change and neutral point resistance cabinet in-connection, binding post still is connected with the inlet wire of main inlet wire cabinet under the inlet wire cabinet busbar.
Preferably, the resistor cabinet connecting cable passes out from the lower part of the main transformer inlet cabinet to the primary cable trench.
Preferably, a high-voltage sleeve is arranged at the top of the main transformer incoming line cabinet in a penetrating way, the insulating tube bus is connected with the top of the high-voltage sleeve, and the incoming line cabinet bus is connected with the bottom of the high-voltage sleeve.
The utility model has the advantages that: the utility model fully utilizes the upper and lower outgoing terminals of the main transformer incoming line cabinet to be respectively led to the low-voltage side of the main transformer, the grounding transformer and the neutral point resistance cabinet, does not damage the insulation of the insulating tubular bus, omits a grounding switch cabinet special for the grounding transformer and the neutral point resistance cabinet, and simultaneously, the equipment permanently does not lose the neutral point protection, thereby reducing the manufacturing cost and increasing the safety and the reliability of the equipment.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a wiring diagram of the present utility model.
In the figure: the device comprises an insulating tube bus 1, a wire inlet cabinet bus 2, a main transformer wire inlet cabinet 3, a grounding transformer and neutral point resistor cabinet 4, a resistor cabinet connecting cable 5 and a high-voltage sleeve 6.
The specific embodiment is as follows:
as shown in fig. 1 and 2, a connection mode of a grounding transformer and neutral point resistor cabinet comprises an insulating tube bus 1, a wire inlet cabinet bus 2, a main transformer wire inlet cabinet 3 and a grounding transformer and neutral point resistor cabinet 4, wherein the insulating tube bus 1 is connected with an upper wiring terminal of the wire inlet cabinet bus 2, the wire inlet cabinet bus 2 penetrates from the top of the main transformer wire inlet cabinet 3, a lower wiring terminal of the wire inlet cabinet bus 2 is connected with a resistor cabinet connecting cable 5, the resistor cabinet connecting cable 5 penetrates from the bottom of the main transformer wire inlet cabinet 3 and is connected with a grounding resistor in the grounding transformer and neutral point resistor cabinet 4, and a lower wiring terminal of the wire inlet cabinet bus 2 is also connected with a wire inlet of the main transformer cabinet;
the grounding transformer and neutral point resistor cabinet 4 is directly connected with the lower wiring terminal of the wire inlet cabinet bus 2 by using the resistor cabinet connecting cable 5 on the premise of not damaging the insulativity of the insulating tube bus 1, so that the establishment of a neutral point is successfully realized, the integral insulativity of the insulating tube bus 1 is prevented from being damaged, and the safe operation and the reliability of the insulating tube bus 1 are ensured; the whole construction process does not need to add a grounding switch cabinet special for the grounding transformer and neutral point resistor cabinet 4, so that the whole construction cost of engineering is reduced, and the risk of losing the neutral point caused by equipment damage or misoperation in the grounding switch cabinet can be avoided.
The resistor cabinet connecting cable 5 penetrates out to the primary cable trench from the lower part of the main transformer inlet wire cabinet 3, and the primary cable trench is utilized for appearance, so that the design and transformation of the position of the resistor cabinet connecting cable 5 penetrating out of the main transformer inlet wire cabinet 3 can be omitted.
The high-voltage sleeve 6 is arranged at the top of the main transformer inlet wire cabinet 3 in a penetrating way, the insulating tubular bus 1 is connected with the top of the high-voltage sleeve 6, the inlet wire cabinet bus 2 is connected with the bottom of the high-voltage sleeve 6, and the insulating tubular bus 1 and the main transformer inlet wire cabinet 3 can be isolated and insulated through the high-voltage sleeve 6.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (3)
1. The utility model provides a connection mode of ground connection change and neutral point resistance cabinet, its characterized in that, including insulating tube busbar, inlet wire cabinet busbar, main inlet wire cabinet and ground connection change and neutral point resistance cabinet, insulating tube busbar with the last binding post of inlet wire cabinet busbar is connected, the inlet wire cabinet busbar is followed main inlet wire cabinet top penetrates, the lower binding post of inlet wire cabinet busbar is through being connected with resistance cabinet connecting cable, resistance cabinet connecting cable is followed main inlet wire cabinet bottom wears out and with ground connection change and neutral point resistance cabinet in ground connection resistance is connected, binding post still is connected with the inlet wire of main inlet wire cabinet under the inlet wire cabinet busbar.
2. The connection mode of a grounding transformer and neutral point resistor cabinet according to claim 1, wherein the resistor cabinet connection cable passes out from the lower part of the main transformer incoming line cabinet to a primary cable trench.
3. The connection mode of a grounding transformer and neutral point resistor cabinet according to claim 1 or 2, wherein a high-voltage sleeve is arranged on the top of the main transformer incoming line cabinet in a penetrating manner, the insulating tube bus is connected with the top of the high-voltage sleeve, and the incoming line cabinet bus is connected with the bottom of the high-voltage sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320230760.6U CN219477255U (en) | 2023-02-09 | 2023-02-09 | Connection mode of grounding transformer and neutral point resistor cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320230760.6U CN219477255U (en) | 2023-02-09 | 2023-02-09 | Connection mode of grounding transformer and neutral point resistor cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219477255U true CN219477255U (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320230760.6U Active CN219477255U (en) | 2023-02-09 | 2023-02-09 | Connection mode of grounding transformer and neutral point resistor cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219477255U (en) |
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2023
- 2023-02-09 CN CN202320230760.6U patent/CN219477255U/en active Active
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