1. Improve the input current waveform caused by capacitive filtering.
2. Reduce and prevent damage to the rectifier bridge and overheating of the capacitor due to inrush current.
3. Improve power factor and reduce DC bus AC pulse.
4. Limit transients in the grid voltage.
Flat wave reactor technical parameters1, rated working voltage: 400V-1200V/50Hz
2, rated working current: 3A to 1500A@40 °C
3, electric strength: iron core - winding 3000VAC / 50Hz / 5mA / 10s no arc arc breakdown (factory test)
4, insulation resistance: 1000VDC insulation resistance ≥ 100MV
5, reactor noise: less than 65dB (test with the horizontal distance of the reactor 1 meter test)
6, protection level: IP007, insulation level: F or above
Flat wave reactor specification1. Core size chart (unit: mm)
2. Electrical schematic
3: Dimensional installation drawing: (Unit: mm unfilled tolerance: ±0.5)
4. Process requirements
1) Winding: The wire package is tight and flat to prevent short circuit between turns caused by insulation damage. Line clad
Adhere to a layer of 0.18 thick NMN paper, the width of the paper is 10mm above and below the aluminum strip, then the surface of the online package is composed of 2 layers of 0.18 thick NMN paper and 1/2 stack of 0.3*25mm non-latitude belt.
2) Stacked iron core: the core burr faces in a uniform, flat, aligned position.
3) Assembly: the creepage distance between the core and the wire package is not less than 8mm. The iron core is assembled neatly, and the three layers of 0.18mmNMN paper are wrapped between the core column and the wire package, and a certain amount of breath is brushed between the iron yoke and the core column. 8026 glue is fixed. The tail series is welded by argon arc welding and outsourced.
Flat wave reactor faultOil immersion
Internal insulation is complicated. Mainly insulated by oil paper, it is easy to catch fire and cause fire. The noise is large. The weight is large and transportation is difficult. The operation and maintenance costs are high.
Dry fault
The center of gravity is high and the shock resistance is poor. It has a large area. There is no iron core inside, and it is difficult to increase the inductance of a single unit and improve the overload capacity. It does not have a wall bushing itself, and a wall bushing needs to be installed between the converter and the converter, which increases the probability of wet flashing and dirty flashing of the wall bushing; it is sensitive to environmental pollution. It is more difficult to measure the heat and infrared. Since the dry-type smoothing reactor is equipped with a noise cover outside, the measurement of the heating point of the internal coil is difficult and the error is large.
The smoothing reactor is used in the DC circuit after rectification. The number of pulses in the rectifier circuit is always limited, and there is always ripple in the straightening voltage of the output. This ripple is often detrimental and needs to be suppressed by a smoothing reactor. The converter stations of the HVDC transmission are equipped with smoothing reactors, so that the output DC is close to the ideal DC. In the DC-powered thyristor electric drive, the smoothing reactor is also indispensable. The smoothing reactor and the DC filter together form a DC harmonic filter circuit on the DC side of the high-voltage DC converter station. The smoothing reactor is generally connected in series between the DC output of each pole converter and the DC line, and is one of the important equipments of the HVDC converter station.
The smoothing reactor and the DC filter together form a DC T-type harmonic filter network, which reduces the AC ripple component and filters out some harmonics, reduces the interference of the communication along the DC line and avoids harmonics to make the regulation unstable. The smoothing reactor also prevents the steep wave generated by the DC line from entering the valve hall, so that the converter valve is protected from overvoltage damage.
When a certain fault occurs in the inverter, it can avoid causing secondary commutation failure. It can reduce the probability of inverter commutation failure due to AC voltage drop. When the DC line is short-circuited, the peak value of the short-circuit current is limited under the adjustment of the rectification side. The larger the inductance value, the better, because the increase in inductance has an effect on the automatic regulation characteristics of the DC transmission system.
In a DC transmission system, when the DC current is interrupted, a higher overvoltage is generated, which is unfavorable for insulation and makes the control unstable. The smoothing reactor prevents the discontinuity of the DC current by limiting the rate of current change caused by the rapid voltage change, thereby reducing the commutation failure rate of the converter.
Floating Board To Board Connector
FLOATING Board to Board Connector
FLOATING Board-to-board (BTB) connectors as the name indicates is used for connecting circuits board together. This kind of connectors are suitable for stacking circuits boards one over another. Flat flexible cables can be avoided using these kinds of connectors; moreover it makes the entire unit more compact. The commonly used BTB connectors are SMT connectors and Berg Strip. We will discuss about them in detail in the following section.
SMT CONNECTOR
Surface Mount Technology (SMT) connector is a commonly found board-to-board connector in advanced circuit boards. As the name indicates this connector is available only in surface mount model. It is carefully mounted on to the solder pads on the surface of the PCB.
SMT connectors are ideal candidate for miniaturization due to their small area of occupancy and stacking height. They are suitable for double layered or multilayered PCBs. They are designed for high performance and reliability.
They commonly found in advanced circuit boards in networking equipment, telephones, mobile phones, computers and other consumer electronics.
Floating Board to Board Connector
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