MNG dynamic reactive power compensation and harmonic treatment complete sets of devices connected in parallel rated voltage of 6kV, 10kV, 27.5kV, 35kV, 110kV AC power system, Used to improve the system's power factor, adjust the grid voltage, reduce line losses, improve grid utilization. The device is a kind of static dynamic reactive power compensation (SVC), Can provide positive and negative continuously adjustable reactive power, using patented technology produced magnetron adjustable reactor approach, which can be more precise control of system voltage and reactive power, the existing reactive power compensation device upgrade products, Since there is little or no impact and inrush caused by capacitor switching, the reliability and lifetime of the device can be greatly improved. Can be three-phase compensation, respectively, especially adapted to three-phase power imbalance situation.
Dry magnetic shunt reactor is our own research and development MCR shunt reactor type magnetron having the advanced level, magnetic shunt reactor continuously and automatically adjust its capacity in accordance with smooth power transmission line. Mainly used in the power network to limit the power frequency over-voltage, inhibit the potential supply current, eliminating the generator self-excitation and reactive power compensation. Can be widely used in power systems, electrified railway, metallurgical industry, coal industry, wind power and other fields.
Second, the product type:
Third, the complete set of devices:
MNG dynamic reactive power compensation and harmonic control complete sets of devices mainly by the switchgear, series reactor, capacitors, magnetron reactor, discharge coil, zinc oxide surge arresters, disconnectors, control panel and other components. Switchgear and relay protection screen by the user to solve or negotiated settlement. Shunt capacitor can be a collection, but also can be a frame structure, the capacitor to the system to deliver capacitive current, play the role of reactive power compensation.
Series reactor connected in series in the capacitor circuit, mainly to limit the inrush current and optimize the use of harmonic suppression. Only used to suppress closing inrush, should be selected for each phase rated inductance XL (0.1-1)% XC. (XC is the rated capacitive reactance of each phase of the capacitor bank). To suppress the 5th and above harmonics, XL (4.5-6)% XC capacitors should be used. The harmonic used to suppress more than 3 harmonics , Should be used XL (12-13)% XC capacitors.
Discharge coil (or voltage transformer) connected in parallel in the capacitor circuit, when disconnected from the power supply, the residual voltage on the capacitor can be reduced from √2Un to below 50V within 5s.
Zinc oxide arrester access Y-line access, which points to the ground, in order to limit the switching capacitor operation caused by over-voltage. Isolating switch can be connected as both line isolation can be connected to the isolation, or both.
Fourth, a schematic diagram:
Fives. Magnetron reactor working principles:
Magnetron reactor is the use of DC magnetic flux principle, That is, by using additional DC excitation and magnetizing reactor core, the magnetic permeability of the core can be changed by adjusting the magnetic saturation of the core of the magnetron reactor so that the reactance value can be continuously adjusted. Set in the core by the unsaturated zone core and the saturation region of the staggered core composed of parallel magnetic circuit, In the parallel magnetic circuit in proportion to set the unsaturated area and saturation area of the core area or set the unsaturated core and saturation region of the core of the respective reluctance by adjusting the SCR trigger conduction angle to control the additional DC excitation current pair Magnetizing iron core, So that the saturation flux leakage flux of the core by the main flux direction is adjacent to the adjacent or left and right adjacent to the unsaturated region of the core absorption to form a self-shielding by changing the excitation of the iron core in parallel magnetic circuit unsaturated region iron Magnetic saturation of the core and the saturation region of the core to achieve a continuous reactance value, fast adjustable.
Controllable reactor principle wiring diagram shown in Figure 2
Figure 2 magnetron reactor principle wiring diagram
In operating the controllable reactor symmetrical legs of each of two coils wound turns of N / 2, which has a ratio of tap tap N2 N /, there are indirect thyristor Tl, T2, The two main windings of different cores are cross-connected in parallel to the power supply, and the free-wheeling diode is connected in the middle of the two coils.
When the magnetron main winding connected to the power supply voltage, both ends of the SCR induces about 1% of the system voltage. Triggering the thyristor T1 to turn on the thyristor T1 in the positive half cycle of the power supply voltage to form an equivalent circuit as shown in the following diagram (a), generating a direct current control current in the loop; turning on the thyristor T22 in the negative half cycle of the power supply voltage, b) The equivalent circuit shown in the circuit to produce DC control current. Two silicon controlled rectifier turns on and off alternately in one power frequency cycle, produces the direct current control current, causes the reactor to work the iron core to be saturated, the output current increases. MCR output current depends on the thyristor control angle, the smaller the control angle, the stronger the generated control current to the core magnetic saturation higher electric work reactors, larger output current. Therefore, to change the thyristor control angle, the capacity of the reactor can be adjusted smoothly. And from the analysis shows that the magnetron reactor has self-excitation function, eliminating the need for a separate DC control power.
Six, magnetron reactor structure design:
Adopting the design technology of parallel magnetic flux leakage self-shielding magnetic circuit and self-coupled DC magnetic auxiliary circuit, the iron core adopts symmetrical splitting structure with unsaturated magnetic density, and the winding adopts symmetrical structure with parallel connection up and down. Application of large transformer structure technology, high-voltage current transformer (CT), voltage transformer (PT), capacitive voltage transformer (CVT) insulation technology, through years of research and development of new technologies, Realized the magnetization reactor product; Compared with the solenoid valve controllable reactance technology, the real loss, low noise, close to low-loss power transformer level; reasonable structure, the production process is mature. Can be mass-produced; reliable quality, safe operation, maintenance-free, low cost. Unsatisfactory core design, coupled with the symmetrical structure does not interfere with each other, the core loss is small, low noise; volt-ampere characteristics, Approximate linear (silicon steel sheet of the linear curve of the curve); The basic body does not produce harmonics, a small amount of harmonics generated by the control circuit, due to the use of △ wiring, the system does not output; The main leakage flux in the core is effectively shielded , The leakage flux in the coil and the fuel tank is small, the additional loss is small, the total loss is small; in accordance with the capacity, it is less than 50% of the solenoid-controlled reactors or SVC phase-controlled reactors (TCR) Small area, basically do not need to maintain; Reactor capacity adjustment range: 1% ~ 100%.
