Related information of series reactor
The role of reactors in high-voltage power distribution systems: series reactors and parallel reactors are common reactors used in power systems. The series reactor is mainly used to limit the short-circuit current. There are also series or parallel capacitors in the filter to limit the higher harmonics in the power grid. Reactors in 220kV, 110kV, 35kV, and 10kV power grids are used to absorb the capacitive reactive power of cable lines. The operating voltage can be adjusted by adjusting the number of series reactors.
Chinese name series reactor Foreign name Series reactor
Use Series reactor operating ambient temperature -25 ～ + 45 (℃)
Rated current: 10 ～ 1000 (A)
Rated voltage 0.4 (KV)
Basic role of series reactor
1. Reduce the inrush current multiple and inrush frequency of the capacitor bank to facilitate the selection of supporting equipment and protective capacitors. According to the GB50227 standard, the inrush current should be limited to less than 10 times the rated current of the capacitor. In order to avoid harmonic amplification (harmonic traction), the volt-ampere characteristics of the series reactor should be as linear as possible. When the network harmonics are small, the inrush current limiting reactor is used; the reactance rate is about 0.1% -1%, that is, the inrush current can be limited to less than 10 times the rated current to reduce the active loss of the reactor, and the size of the reactor is small Small footprint, easy to install in the capacitor cabinet. Using this kind of reactor is both economical and energy saving.
2. Series filter reactor. After the reactor impedance and capacitor capacitance are fully tuned, they form an AC filter of a certain harmonic. Filter out a certain high-order harmonic, and reduce the voltage value of that harmonic on the bus, so that no high-order harmonic current exists on the line, and improve the voltage quality of the power grid.
Tuning degree of filter reactor:
XL = ωL = 1 / n2XC = AXC
Where A-tuning degree (%)
XL－Reactance value (Ω)
XC－Capacitance reactance (Ω)
ω ---- 314
The reactor is configured according to the above-mentioned tuning degree, which can satisfy the filtering of each harmonic.
3. The prerequisite for suppressing harmonic reactors is to understand the harmonics of the power grid, and to find out whether there are large rectifiers, arcs, steelmaking and other equipment that can generate harmonics in the surrounding electricity users. For high-voltage transformers and high-voltage motors, measure the actual magnitude of the network harmonics as much as possible, and then configure appropriate reactors based on the actual harmonic quantities. The iron core reactor has poor linearity and noise, and the air core reactor runs without noise, with good linearity and low loss.
The standard stipulates that when the capacity of the air-core reactor is below 100KVAR, the loss per volt-ampere is not greater than 0.03W. For example: a single 12000VA reactor with a 6% reactor loss of 360W and a three-phase active loss of 1080W is a large number. When the harmonics on the power network are small, the use of current-limiting reactors can save energy.
4. The series reactor is provided to reduce the short circuit current value provided by the system to the parallel capacitor device or the capacitor device to the system.
5. It can reduce the discharge current from the capacitor bank to the faulty capacitor bank and protect the power capacitor.
6, can reduce the inrush current of the capacitor bank, is conducive to the contactor arc extinguishing, reducing the amplitude of the operating overvoltage.
7. Reduced the over-voltage amplitude caused by operating the parallel capacitor bank, which is beneficial to the over-voltage protection of the power grid.
Three-phase series reactor
2 selection principles
Electricity companies have their own characteristics and have different requirements for equipment. Dry-type reactors have the characteristics of low noise, good linearity of reactors, high mechanical strength, simple installation, etc .; oil-immersed reactors have low losses and occupy an area. Small, bad linearity, noisy. Therefore, what kind of reactor to use should be considered comprehensively. The main role of series reactor is to suppress harmonics, limit inrush current and filter harmonics. Reactance rate is the main parameter of the reactor, and the size of the reactor directly affects its function.
The current-limiting reactor reactance rate is 0.1-1%, and the harmonic-reducing reactor reactance rate is 4.5% -13%. It is appropriate that the current-limiting reactor limit the inrush current to less than 10 times the rated current of the capacitor. When configuring a current-limiting reactor, the line reactance (1 μH / M) should be considered.
Product description of series reactor
1. Series reactor, which passes AC current, its role is to connect in series with the power factor compensation capacitor, and form a series resonance for the steady-state harmonics (5th, 7th, 11th, and 13th). Usually there is a reactor with a reactance rate of 4.5 to 6 (%). The usual reactance rate for the 5th harmonic is 6%, which is a high-inductance Satons reactor. The usual reactance rate for the 3rd harmonic is 12 to 13 (%). The sub-harmonic usually has a reactance of 26 to 27 (%), which is a very high inductance reactor.
2. Safe, flame retardant, environmentally friendly and pollution-free, can be directly installed in the load center. The imported epoxy resin has high mechanical strength, strong short-circuit resistance, low partial discharge and high reliability. Low loss, low noise, maintenance-free, easy installation, and obvious energy saving effect. Good moisture resistance, can operate in high humidity such as in tropical areas and other harsh environments.
Applicable environment of series reactor
1. Altitude does not exceed 2000 meters;
2. Operating ambient temperature: -25 ～ + 45 (℃), relative humidity should not exceed 90%;
3. There is no harmful gas and no flammable and explosive materials around;
4. The surrounding environment should have good ventilation conditions. If series reactors are installed in the cabinet, ventilation equipment should be installed.
Product characteristics of series reactor
1. Can be used in 400V, 660V systems;
2. Type of reactance rate: 1%, 6%, 12%;
3. Rated insulation level: 3KV / min;
4. Temperature rise limit of each part of the reactor: iron core does not exceed 85K, coil temperature rise does not exceed 95K;
5. Reactor noise is not greater than 45dB;
6. The reactor can run for a long time under the power frequency plus harmonic current not more than 1.35 times the rated current;
7. Reactance linearity: the ratio of the reactance at 1.8 times the rated current to the reactance at the rated current is not less than 0.95;
8. The difference between any two-phase reactance value of the series reactor is not more than ± 3%;
9. The temperature resistance level is above H level (180 ℃).
Technical parameters of series reactor
Insulation structure: Dry type reactor with or without iron core: Core type reactor Winding type: Foil winding Product certification: CE
Application: Series reactor rated current: 10 ～ 1000 (A)
System rated voltage: 0.4 (KV)
Structure description of series reactor
(1) The material of the iron core is high-quality cold-rolled silicon steel sheet coated with mineral oxide;
(2) The iron core pillars are vacuum-casted with epoxy resin, so that the air gap between the iron discs is closed by epoxy resin on the surface of the iron core pillars to form a resin layer, which effectively reduces the vibration between the iron core discs, thereby reducing noise. At the same time, the insulation strength of the iron core and the coil is enhanced;
(3) The surface of the iron core is coated with F-grade epoxy resin to take anti-corrosion measures to avoid rust.
(1) The coil is an epoxy vacuum casting coil. The inner and outer coils of the coil are reinforced with epoxy glass grid cloth, and the high-voltage series reactor is cast under vacuum using an F-grade epoxy casting system. The coil not only has good insulation performance, but also has high mechanical strength, and can withstand current shock and cooling shock without cracking;
(2) The epoxy casting coil does not absorb water, has good moisture resistance, low partial discharge, and can be safely operated under severe environmental conditions.
(1) The core end is made of high-quality silicon steel segment surface glue, which firmly combines the core post with the iron pestle, which greatly reduces the noise during operation;
(2) The high-voltage series reactor uses an advanced pre-assembly system to detect the assembly results during assembly;
(3) Advanced vibration and noise reduction structure system, including: strong compression of the upper and lower clamps, an elastic rubber pad between the clamp and the coil, and an elastic rubber pad between the clamp and the seat
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