Arc extinction and harmonic elimination cabinet

Most of the 3~35kV power supply systems in China operate as neutral, ungrounded systems. When a single-phase grounding fault occurs in this system, the power grid can still function with the fault, leading to lower operational costs and increased reliability. However, this power supply method is vulnerable to arc grounding overvoltage and phase short circuits when there is a significant single-phase grounding current, resulting in substantial damage to power supply equipment. In the past, a common solution was to add an elimination coil to offset the capacitive current at the neutral point and prevent arc light at the fault point.While the primary goal of this approach is to eliminate arc light, the arc suppression coil's characteristics make it challenging to effectively compensate for the capacitive current, particularly in addressing the harmful effects of high-frequency components on power supply equipment. An intelligent short arc device, which utilizes a group of vacuum contactors for phase control during arc grounding, can effectively eliminate arc light by isolating the fault contact from the ground.

Operating Environment of  Arc extinction and harmonic elimination cabinet

1,Ambient temperature:indoor type -30C~+40C

2.Altitude: not more than 1500 meters (higher than 1500 meters,please specify when ordering).

3.The surrounding air is not obviously polluted by dust,gas,smoke,corrosion and other specific explosive mixture

4.Surrounding air humidity: average daily relative humidity ≤96%,average monthly relative humidity ≤90%, average daily water vapor pressure ≤ 2.2kpa,average monthly water vapor pressure S 1.8kpa.

Operating Principle for Arc extinction and harmonic elimination cabinet

During regular functioning, the microcomputer controller constantly monitors the voltage signal received from PT. Suppose the system experiences PT disconnection, single-phase metal grounding, or single-phase arc grounding. In that case, the auxiliary secondary open triangle voltage will promptly shift from a low to a high level. The microcomputer controller will then activate. It will determine the type and phase discrepancy based on the alteration in the PT secondary voltage..

Basic functions and features of Arc extinction and harmonic elimination cabinet

1. Can restrict the climatic overvoltage and operating overvoltage of the system to a reduced voltage degree to ensure the insulation safety of the power grid and electrical equipment.

2. The device has a quick procedure rate and can run within 30ms ~ 40ms. It can swiftly eliminate recurring arc light and stable arc light grounding mistakes, reduce arc light basing overvoltage, stop further growth of crashes, and minimize the line's accident trip rate.

3. It can promptly and successfully eliminate the system's powerful overvoltage, protect against the long-lasting powerful overvoltage damaging the system's insulation, and avoid the resonant overvoltage damaging the lightning arrester installed in the power grid and tiny inductive lots.

4. After the gadget is operated, the capacitor current of 200A is enabled to pass continuously for at least 2 hours. The user can deal with the geological fault after completing the changing operation of lots transfer.

5. Accurately discovering single-phase grounding fault lines is of great value in preventing the growth of accidents and lowering the workload of procedure and maintenance personnel.

6. From the tool's working principle, the system of limiting overvoltage has nothing to do with the capacitance current of the power grid to the ground, so its security performance does not alter with the adjustment of the power grid's operation setting. Both huge and small power grids can be used, and the growth of the power grid has no impact.

7. The potential transformer in this gadget can provide the system's voltage signal for the metering tool and relay protection tool, which can change the conventional PT cabinet.

8. The arc extinction and harmonic elimination cabinet can measure the single-phase grounding capacitance current of the system.

9. The arc extinction and harmonic elimination device is easy to install and debug. It has little dimension and is suitable for substations and completely dry power plant high-voltage factory power systems. It is appropriate for both brand-new construction and the replacement of old power stations.

10. Arc extinction and harmonic elimination are highly cost-efficient. Compared to an arc suppression coil system, their performance and rate are excellent. .

Main components and functions for Arc extinction and harmonic elimination cabinet

The TBP combined overvoltage protector is a cutting-edge device that incorporates a large-capacity ZNO nonlinear resistor and discharge gap phase combination structure. This innovative design addresses the issues of charge rate and power frequency aging, ensuring the protector's impact coefficient remains constant at 1. The device's discharge value remains consistent across various voltage waveforms, making it immune to overvoltage wave shape. Additionally, the protector employs a four-star connection method, significantly reducing overvoltage between phases by 60-70%. This results in a remarkably reliable protection performance, making it the ideal choice for limiting all types of overvoltage in electrical systems, including atmospheric and operating overvoltage.

35kv arc extinction cabinet High-voltage vacuum contactor with split-phase control (KA-KC)

This high-voltage vacuum AC contactor features a unique three-phase design, where each phase is connected to the busbar on one end and grounded on the other. Under normal operating conditions, the vacuum switch remains open, regulated by a microcomputer controller. This ensures that all three phases remain locked and prevents any single phase from closing while the others remain open. When one phase is closed, the other two phases are disabled, preventing them from grounding.

35kv arc extinction cabinet Multi-function microcomputer controller WZK (core technology)

The multi-function microcomputer controller is the technological core part of the device, and it takes the PIC single-chip microcomputer with high anti-interference capacity as the core sub-processor. The core CPU is made up of two solitary chip microcomputers, the mistake handling speed is very fast, and generally complies with features and features:

1) High level of automation. All functions of the microcomputer controller are executed immediately without hands-on operation, making it easy to maintain and run.

2) Anti - 10 shen training, premium quality. Microcomputer control beam with secondary power supply technology, the mouth support group, and magnetic disturbance, all user interfaces are optical/electrical isolation, can be in addition to the electrical source and a secondary system control

3) Perfect defense feature. Because the microcomputer controller uses two processors as a refining system, it can at the same time complete the comprehensive control of arc elimination, harmonic removal, and line choice, and the rate is very quick. The device can The feature of the high-voltage insurance fusing alarm and additional voltage signal circuit mistake alarm system can be completed.

4) Voltage dimension feature. The microcomputer controller can determine the system's voltage and display it electronically.

5) Data remote transmission function. The microcomputer controller is furnished with an RS485/232 interaction user interface, which can report the system's real-time fault information and the gadget's functioning condition to the control center.

6) Mistake document question feature. Microcomputer controllers with memory can system mistake info (consisting of mistake type \ mistake time, and more information) in long-term storage; users can, according to the demand, inquire about the system mistake records

7) Accurate line option feature. Several controllers of the WZK microcomputer developed the line option component, which can complete the single-phase grounding line selection of several outward bound lines (each section of bus 32). They adopted the line choice principle of the "incremental anomaly approach."

Despite what the grounding of the system is, the grounding line can pick well. 

35kv arc extinction cabinet High voltage current limiting fuse FU2

1. The high voltage current limiting fuse is the backup protection device of the whole gadget and has the adhering to special features.

2. Huge breaking ability, approximately 63KA

3. The existing limiting result is great; it can make the fault current limitation in the optimum short-circuit existing effect present 1/5 listed below.

4. The damaging arc voltage is reduced throughout the fuse damaging process, and it will certainly be further decreased when utilized in a system listed below-ranked voltage, so a 12Kv fuse can be used in a 7. 2kV system without the threat of damaging the system insulation.

Schematic Diagram

Structure Drawing