Grounding full-compensation arc extinguishing device based on Dy type transformer
Through the grounding fully compensated arc suppression device based on Dy transformer, efficient arc suppression of single-phase ground faults is achieved using transformers and phase-select switch groups, which solves the problems of complex structure and low reliability in the prior art, and improves the system Reliability and cost-effectiveness.
Patent Information
- Application Number
- CN202420670067.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The existing active full compensation device for grounding faults solves the problems of complex structure, low reliability and large loss of power electronic equipment when solving single-phase grounding faults.
The grounding fully compensated arc suppression device based on Dy transformer is adopted. The fault phase voltage is reduced to 0V through the Dy transformer and the phase selection switch group, which avoids the use of inverter power supply. The primary side of the transformer uses a triangular wiring, and the voltage fluctuation is small. High transmission efficiency, simple structure and high reliability.
It realizes efficient arc suppression of single-phase grounding faults, reduces costs, optimizes the combination form of phase selection switches, is simple to control logic, and improves overall design reliability and stability.
Smart Images
Figure CN222147160U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of single-phase grounding protection devices for distribution networks, in particular to a grounding full-compensation arc extinguishing device. Background Art
[0002] The active full compensation device for ground fault is generally composed of a power transformer, a step-up transformer, a vacuum contactor, an active power compensator (APC), a controller, etc. When a single-phase ground fault occurs, the controller adjusts the output voltage of the active power compensator, which can compensate the voltage and current at the single-phase ground fault point to close to 0, completely eliminate the arc when a single-phase ground fault occurs, and can also use the disturbance method to accurately select the line, which is a better solution to the single-phase ground fault. The advantage of using active equipment is that the output voltage is output through a high-power power electronic device inverter, which has the characteristics of no step difference in output voltage and high adjustment accuracy; but power electronic equipment also has other problems, such as large losses and low reliability of power electronic equipment. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a grounding full-compensation arc-extinguishing device based on a Dy-type transformer with simple structure and high reliability.
[0004] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.
[0005] A grounding full-compensation arc-extinguishing device based on a Dy-type transformer comprises a controller, a Dy-type transformer and a phase-selection switch group, wherein the primary winding of the Dy-type transformer is connected to a three-phase bus in a delta connection manner, the secondary winding of the Dy-type transformer is connected in a Y-type connection manner, and the secondary winding is grounded via the phase-selection switch group; the input end of the controller is connected to the output end of a voltage transformer for collecting bus voltage, and the output end of the controller is connected to the controlled end of the phase-selection switch group.
[0006] The above-mentioned grounding full-compensation arc-extinguishing device based on a Dy-type transformer, the connection group of the Dy-type transformer is any one of Dyn1, Dyn3, Dyn5, Dyn7, Dyn9, and Dyn11.
[0007] The above-mentioned grounding full-compensation arc-extinguishing device based on a Dy-type transformer, the phase selection switch group includes an A-phase switch KMA, a B-phase switch KMB group and a C-phase switch KMC, wherein the A-phase switch KMA simultaneously controls the A and B phase voltages of the transformer secondary side, the B-phase switch KMB simultaneously controls the B and C phase voltages of the transformer secondary side, and the C-phase switch KMC simultaneously controls the C and A phase voltages of the transformer secondary side, and the controlled ends of the switches of each phase are respectively connected to the output ends of the controller.
[0008] In the above-mentioned grounding full-compensation arc-extinguishing device based on a Dy-type transformer, the secondary winding of the Dy-type transformer is connected to a voltage-regulating tap-changer for fine-tuning the output voltage, and the controlled end of the voltage-regulating tap-changer is connected to the output end of the controller.
[0009] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows.
[0010] The utility model does not need to use an inverter with power electronic devices, and can achieve the purpose of reducing the fault phase voltage to 0V only through a transformer and a phase selection switch. The primary side of the transformer adopts a triangle connection form, the power supply voltage fluctuation is small, the transmission efficiency is higher, and the stability is good; the overall design structure is simple and the reliability is high. The utility model also optimizes the combination form of the phase selection switch, the control logic is simple, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is the system wiring diagram of the utility model.
[0012] Among them: BYQ.Dy type transformer, PT.voltage transformer, KMA.A phase switch, KMB.B phase switch, KMC.C phase switch, KZQ.controller. DETAILED DESCRIPTION
[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0014] A grounding full compensation arc extinguishing device based on a Dy type transformer includes a controller KZQ, a Dy type transformer BYQ, a phase selection switch group KM and a voltage transformer PT, wherein the phase selection switch group includes an A phase switch KMA, a B phase switch KMB group and a C phase switch KMC. The connection relationship between the above electrical equipment is as follows: Figure 1 shown.
[0015] The primary winding of the Dy-type transformer BYQ is connected to the three-phase bus in a delta connection mode, and the secondary winding of the Dy-type transformer BYQ is connected in a Y-type connection mode, and the secondary winding is grounded via a phase selection switch group KM. In the utility model, the connection group of the Dy-type transformer BYQ is any one of Dyn1, Dyn3, Dyn5, Dyn7, Dyn9, and Dyn11.
[0016] Among them: the A-phase switch KMA simultaneously controls the A and B phase voltages on the secondary side of the transformer, the B-phase switch KMB simultaneously controls the B and C phase voltages on the secondary side of the transformer, and the C-phase switch KMC simultaneously controls the C and A phase voltages on the secondary side of the transformer. The controlled ends of the switches of each phase are respectively connected to the output ends of the controller.
[0017] The voltage transformer PT is used to collect the bus voltage, and its secondary voltage signal is connected to the input end of the controller KZQ; the output end of the controller is respectively connected to the controlled end of each phase selection switch, and its switching is controlled by the controller.
[0018] During the working process of the utility model, the controller monitors the system bus voltage information in real time. When a single-phase grounding fault occurs in the system, the controller KZQ judges the phase and closes the phase selection switch corresponding to the fault at the same time, forcing the fault phase voltage to 0V.
[0019] In the utility model, a voltage regulating tap changer can also be connected to the secondary winding of the Dy type transformer BYQ to fine-tune the output voltage, and the controlled end of the voltage regulating tap changer is connected to the output end of the controller.
Claims
1. A grounding full compensation arc extinguishing device based on a Dy type transformer, including a controller (KZQ), characterized in that: It also includes a Dy-type transformer (BYQ) and a phase-selection switch group, wherein the primary winding of the Dy-type transformer (BYQ) is connected to the three-phase bus in a delta connection mode, the secondary winding of the Dy-type transformer (BYQ) is connected in a Y-type connection mode, and the secondary winding is grounded via the phase-selection switch group; the input end of the controller (KZQ) is connected to the output end of a voltage transformer (PT) for collecting bus voltage, and the output end of the controller (KZQ) is connected to the controlled end of the phase-selection switch group; The phase selection switch group includes an A-phase switch KMA, a B-phase switch KMB and a C-phase switch KMC, wherein the A-phase switch KMA simultaneously controls the A and B phase voltages on the secondary side of the transformer, the B-phase switch KMB simultaneously controls the B and C phase voltages on the secondary side of the transformer, and the C-phase switch KMC simultaneously controls the C and A phase voltages on the secondary side of the transformer, and the controlled ends of the switches of each phase are respectively connected to the output ends of the controller.
2. A grounding full compensation arc extinguishing device based on a Dy type transformer according to claim 1, characterized in that: The connection group of the Dy type transformer (BYQ) is any one of Dyn1, Dyn3, Dyn5, Dyn7, Dyn9, and Dyn11.
3. A grounding full compensation arc extinguishing device based on a Dy type transformer according to claim 1, characterized in that: The secondary winding of the Dy-type transformer (BYQ) is connected to a voltage-regulating tap-changer for fine-tuning the output voltage, and a controlled end of the voltage-regulating tap-changer is connected to an output end of a controller.