Substation active intervention type device
By integrating the active intervention arc suppression device and the station transformer in one cabinet in the substation, the problem of increased space and cost in the prior art is solved, and higher system reliability and operating efficiency are achieved.
Patent Information
- Application Number
- CN202422002188.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-16
AI Technical Summary
In the existing substation design, it is necessary to configure a grounding transformer and a station transformer separately, resulting in increased space and cost.
Design a substation active intervention device, which is installed in the same cabinet in combination with the active intervention arc suppression device and the station transformer, including high-voltage switch cabinet, phase-separated ground circuit breaker, voltage transformer, self-detachment combined overvoltage protector and other components.
Through integrated design, the substation space and cost are saved, the system reliability and operating efficiency can be improved, and the arc voltage can be quickly extinguished and overvoltage and resonance can be limited when a single-phase grounding fault occurs in a neutral point ungrounded system.
Smart Images
Figure CN223039637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power systems, and particularly to an active intervention device for a substation. Background Art
[0002] In traditional substation designs, grounding transformers and station service transformers are essential components. The grounding transformer is used to provide a zero-sequence current path when a grounding fault occurs in the power grid, while the station service transformer is used to supply power for the substation. With the development of technology, active intervention arc suppression devices have gradually been applied to the distribution network to reduce the impact of grounding faults on the system. However, this requires separate configuration of grounding transformers and station service transformers, resulting in increased space and cost. Summary of the Utility Model
[0003] The main purpose of the utility model is to provide an active intervention device for a substation, aiming to solve the existing technical problems.
[0004] To achieve the above purpose, the utility model provides an active intervention device for a substation, which includes an active intervention arc suppression device and a station service transformer. The active intervention arc suppression device and the station service transformer are integrally installed in the same cabinet. The active intervention arc suppression device includes:
[0005] A high-voltage switch cabinet for controlling and protecting the power system of the substation;
[0006] A split-phase grounding circuit breaker for extinguishing the arc at the grounding point instantaneously through single-phase closing operation when a single-phase grounding occurs in a non-grounded neutral system, and at the same time limiting the overvoltage and resonance in the system;
[0007] A voltage transformer for providing secondary voltage and auxiliary secondary voltage signals of the protected system;
[0008] A self-disconnecting combined overvoltage protector for limiting various overvoltages between phase and ground and between phases to a lower level allowed by the equipment insulation;
[0009] A self-limiting strong damping suppressor for damping resonance and destroying the zero-sequence resonance circuit when the resistance is greater than the rated value during resonance.
[0010] Furthermore, the active intervention arc suppression device further includes a current transformer for providing secondary current signals of the protected system.
[0011] Furthermore, the active intervention arc suppression device further includes an arc suppression controller for judging the fault type and phase according to the signals provided by the voltage transformer, sending fault signals to the control room or the upper computer, and sending a fault phase closing operation command to the split-phase grounding circuit breaker when a grounding fault occurs in the system.
[0012] Further, the active intervention type arc suppression device further includes a zero-sequence current transformer, which is used to read out the grounding capacitance current of the system through the grounding current after the device operates, and provide current mutation information to the controller.
[0013] Further, the active intervention type arc suppression device further includes a harmonic elimination controller, which is used to sample the system voltage signal.
[0014] Further, the active intervention type arc suppression device further includes a line protection device, which is used to sample the current transformer signal and control the three-stage protection of the pre-positioned handcart circuit breaker.
[0015] Further, the active intervention type arc suppression device further includes a pre-positioned handcart circuit breaker, which is used to cooperate with the three-stage protection of the line protection device as the closing and opening actuator, and serve as the backup protection for the short circuit between different names of phases after the single-phase closing of the device's split-phase grounding circuit breaker.
[0016] The beneficial effects of the present utility model are as follows:
[0017] In the present utility model, when a single-phase grounding fault occurs in the ungrounded neutral system, the split-phase grounding circuit breaker can perform a single-phase closing operation to extinguish the arc at the grounding point instantaneously, and at the same time limit the overvoltage and resonance in the system; through the integrated design of the equipment, the present utility model saves the space and cost of the substation, and improves the reliability and operation efficiency of the system. Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of the active intervention type device of the present utility model;
[0019] Figure 2 It is a schematic structural diagram of the station service transformer of the present utility model;
[0020] Figure 3 It is a schematic diagram of the electrical control principle of the present utility model.
[0021] Description of the Reference Numerals:
[0022] 1. Pre-positioned handcart circuit breaker; 2. Split-phase grounding circuit breaker; 3. Self-limiting strong damping suppressor; 4. Fuse; 5. Voltage transformer; 6. Self-disengaging combined overvoltage protector; 7. Station service transformer. Detailed Embodiment
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0024] Please refer to Figures 1-3 , the present utility model provides an active intervention type device for a substation, including an active intervention type arc suppression device and a station service transformer 7, and the active intervention type arc suppression device and the station service transformer 7 are integrally installed in the same cabinet.
[0025] In this embodiment, when a single-phase grounding fault occurs in a neutral point non-grounding system, the phase-separated grounding switch can perform a single-phase closing operation to instantly extinguish the arc at the grounding point and simultaneously limit the overvoltage and resonance in the system. The voltage transformer 5 and the current transformer are used to monitor the system status and provide data for analysis by the control system. The overvoltage protector is used to protect electrical equipment when overvoltage occurs. A fuse 4 is provided above the voltage transformer.
[0026] By integrating the station service transformer 7 and the active intervention type arc suppression device in one cabinet, not only the occupied space of the equipment is reduced, but also the construction and maintenance costs of the substation are reduced, and the reliability and efficiency of the system are improved.
[0027] The active intervention type arc suppression device specifically includes
[0028] The high-voltage switch cabinet is used to control and protect the power system of the substation.
[0029] The phase-separated grounding breaker 2 is used to instantly extinguish the arc at the grounding point through a single-phase closing operation when a single-phase grounding occurs in a neutral point non-grounding system, and at the same time limit the overvoltage and resonance in the system.
[0030] The voltage transformer 5 is used to provide the secondary voltage and auxiliary secondary voltage signals of the protected system.
[0031] The arc suppression controller judges the fault type and phase based on the signal provided by the voltage transformer 5, sends a fault signal to the control room or the upper computer, and when a grounding fault occurs in the system, sends a fault phase closing operation command to the phase-separated grounding breaker 2.
[0032] The self-disengaging combined overvoltage protector 6 is used to limit various overvoltages between the phase and the ground and between the phases to a lower level allowed by the equipment insulation.
[0033] The zero-sequence current transformer and the grounding ammeter are used to read out the grounding capacitance current of the system through the grounding current after the device operates, and provide current mutation information to the controller.
[0034] The self-limiting strong damping suppressor 3 has a resistance close to 40k - 60kΩ under normal operating conditions, and a resistance greater than 300KΩ when resonance occurs, damping the resonance and destroying the zero-sequence resonance circuit.
[0035] The harmonic elimination controller is used to sample the system voltage signal, and has functions such as microcomputer secondary harmonic elimination, and fault alarms for low voltage, overvoltage, resonance, voltage loss, etc.
[0036] The line protection device is used to sample the signal of the current transformer and control the three-stage protection of the front-mounted handcart circuit breaker 1.
[0037] The current transformer is used to provide the secondary current signal of the protected system.
[0038] The front-mounted handcart circuit breaker 1 cooperates with the three-stage protection of the line protection device as the closing and opening actuator, and serves as the backup protection for the short circuit of the different-name phases after the single-phase closing of the device's split-phase grounding circuit breaker 2.
[0039] By combining the station service transformer 7 with the active intervention type arc suppression device in one cabinet, the space and load design requirements in the substation are saved.
[0040] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.
[0041] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or the scheme where A and B are satisfied simultaneously. In addition, "multiple" means more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist.
[0042] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A substation active intervention device, characterized in that: It comprises an active intervention type arc extinguishing device and a station transformer (7), wherein the active intervention type arc extinguishing device and the station transformer (7) are installed in combination in the same cabinet; The active intervention type arc extinguishing device comprises: High-voltage switchgear, used to control and protect the power system of the substation; A phase-splitting grounding circuit breaker (2) is used to extinguish the grounding arc instantly through a single-phase closing action when a single-phase grounding occurs in a neutral point ungrounded system, while limiting overvoltage and resonance in the system; A voltage transformer (5), used for providing a secondary voltage and an auxiliary secondary voltage signal of a protected system; A self-detaching combined overvoltage protector (6) is used to limit various overvoltages between phase to ground and between phases to a lower level allowed by the insulation of the equipment; The self-limiting current strong damping suppressor (3) is used to damp the resonance and destroy the zero-sequence resonance circuit when the resistance is greater than the rated value when the resonance occurs.
2. A substation active intervention device according to claim 1, characterized in that: The active intervention arc extinguishing device also includes a current transformer for providing a secondary current signal of the protected system.
3. The active intervention device for a substation according to claim 1, characterized in that: The active intervention arc extinguishing device also includes an arc extinguishing controller, which is used to judge the fault type and phase according to the signal provided by the voltage transformer (5), send a fault signal to the control room or the host computer, and send a fault phase closing action command to the phase-splitting grounding circuit breaker (2) when a ground fault occurs in the system.
4. The active intervention device for a substation according to claim 1, characterized in that: The active intervention arc extinguishing device also includes a zero-sequence current transformer, which is used to read the grounding capacitance current of the system through the grounding current after the device is activated, and provide current mutation information to the controller.
5. The active intervention device for a substation according to claim 1, characterized in that: The active intervention arc extinguishing device also includes a detuning controller for sampling a system voltage signal.
6. The active intervention device for a substation according to claim 1, characterized in that: The active intervention arc extinguishing device also includes a line protection device for sampling current transformer signals and controlling the three-stage protection of the front trolley circuit breaker (1).
7. The active intervention device for a substation according to claim 6, characterized in that: The active intervention arc extinguishing device also includes a front trolley circuit breaker (1) for cooperating with the three-stage protection opening and closing actuator of the line protection device, and serving as backup protection for short circuit of opposite phases after single-phase closing of the device's phase-splitting grounding circuit breaker (2).