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 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.

1, classified by type

(1) Oil-immersed smoothing reactor

The structure of the oil-immersed smoothing reactor is similar to that of a transformer, and is mainly composed of a coil, a core, a fuel tank, a casing, a cooling system, and the like. The oil-immersed smoothing reactor has a core in its structure, and its load current is nonlinearly related to magnetism. 】

Advantages of oil-immersed smoothing reactor: Because oil-immersed smoothing reactor has iron core, it is easier to increase the single inductance; oil-paper insulation system of oil-immersed smoothing reactor is mature and reliable. The oil-immersed smoothing reactor is installed on the ground, so the center of gravity is low and the seismic performance is good. The oil-immersed smoothing reactor uses a dry casing to penetrate the valve hall, replacing the horizontal wall bushing and solving the horizontal wall penetration. Uneven wet flashing of the casing; the vertical casing of the oil-immersed smoothing reactor also uses a dry casing, which reduces the probability of contamination flashing.

(2) Dry type smoothing reactor

The dry-type smoothing reactor mainly consists of a coil, a bracket, an insulating pillar, a pressure equalizing ring, a base, and the like. The coil consists of a multi-layer concentrically compressed aluminum wire package. Each layer of the wire is cast with epoxy resin insulation, and the interlayer is covered with spacers to ensure interlayer insulation and heat dissipation. Each layer of the coil is securely fastened by vertical fasteners to ensure that the coil does not deform when it vibrates. Since the dry-type smoothing reactor has no iron core, the load current is linear with the magnetic force.

Advantages of dry-type smoothing reactor: Simple insulation to ground. The insulation of the dry-type smoothing reactor is mainly provided by the post insulator, which improves the reliability of the main insulation. Oil-free, eliminating fire hazards and environmental impacts. The dry flat is resistant to oil-free insulation, so there is no fire hazard and environmental impact, and there is no need to install a protective wall between the valve hall and the outdoor. There is no critical mass field when the current is turned over. High-voltage DC inversion needs to change the polarity of the voltage, which will generate a critical field strength in the oil-paper composite insulation system due to the trapped charge; but for the dry-type smoothing reactor, changing the voltage polarity only generates stress on the post insulator. The critical field strength is limited such that the post insulator of the dry smoothing reactor is similar in characteristics to the other bus bar insulators. The load current is linear with the flux linkage. Since the dry-type smoothing reactor has no iron core, there is no flux saturation in the event of a fault, and the same inductance value is maintained in any case. Transient overvoltage is low. Since the dry-type smoothing reactor has a low capacitance to ground, the requirements for the level of impact insulation of the flat resistance are also low. The audible noise is low. Light weight, easy to transport and handle. Low operating and maintenance costs. Dry-type smoothing reactors are basically maintenance-free.

2, classified by structure

(1) Hollow magnetic shielded smoothing reactor

(2) Air gap iron core smoothing reactor

Insulation structure: dry reactor

With or without iron core: hollow reactor

Product Certification: CE

Uses: smoothing reactor

Rated current: 10 ~ 10000 (A)

System rated voltage: 0.4 ~ 63 (KV)

Model: PKKF-110/0.4

Installation location: indoors

Ambient temperature: -30 ° C ~ +45 ° C

Good ventilation: ventilation equipment should be installed when installed in the cabinet

Altitude: no more than 1500m, higher altitude needs to be customized

Relative humidity: no more than 90%

The iron core adopts high-quality low-loss cold-rolled silicon steel sheet, and the winding adopts H-class insulated copper enameled wire. The reactor has the characteristics of low temperature rise, low loss and high electrical performance.

Scientific dipping and hot curing process to ensure the overall mechanical strength of the product and effectively control the noise during operation

Precise design calculation and stable production process control to ensure good product filtering effect and stable and reliable operation

Strictly controlled inductance deviation to avoid resonance and overload.

V.35 CONNECTORS

V.35 CONNECTORS

SPECIFICATIONS
Current Rating :7A
Insulation Resistance :≥1000 MΩ
Dielectric Withstanding Voatge :
1200VAC MIN 1Minute
Operating temperature : -55°C~ 105°C
Contact Resistance :≤35mΩ
Insulator Material :PBT & G/F UL 94V-0
Contact Material : Phosphor Bronze
Suitable:V.35VCT-F FEMALE TERMINAL

V.35 CONNECTORS

ShenZhen Antenk Electronics Co,Ltd , https://www.antenkelec.com