Shri Hans Electrical

Mulund West, Mumbai, Maharashtra

These are current limiting reactors except that such reactors provide low reactance under normal conditions and a high reactance under fault conditions. The reactor consists of two halves, wound in opposite direction to serve the above application.

An arc suppression coil is a single phase, variable inductance, oil immersed, iron core reactor that is connected between the neutral of a transformer and ground for the purpose of achieving a resonant neutral ground. The zero sequence impedance of transformer is taken into consideration in rating the inductance of the arc suppression coil. The adjustment of the inductance is achieved in steps by means of taps on the winding or can be continuously adjusted by varying the reluctance of the magnetic circuit; the length of the air gap is adjusted by means of a central movable portion of the core.

Neutral Grounding Reactors (NGRs) are used to control single line to ground faults only. NGR are particularly used at transmission voltage levels, when autotransformers with a delta tertiary are employed. Neutral Grounding Reactors (NGRs), normally installed between the transformer or generator neutral and ground, are effective in controlling single line to ground faults since, in general, the system short circuit impedance is largely reactive. NGRs reduce short circuit stresses on station transformers the most prevalent type of fault in an electrical system.

Oil cooled type of reactors can be made suitable for indoor or outdoor use at all levels of system voltage. Internally the construction consists of a core-less paper-insulated disk winding or layer type winding. To prevent the stray flux from passing into the steel enclosure two different methods of construction are employed in oil cooled reactors. The first consists of laminated core-plate about the winding to contain the flux (Magnetic shielding) and the second prevents the flux from entering the enclosure by providing a non-magnetic screen of aluminium surrounding the winding (Non-Magnetic shielding).

Iron core reactors consist of a Aluminium copper winding wound around an iron core that has air gaps. Iron- core reactors are usually placed inside enclosure

Dry type air core reactors have traditionally been used for current limiting applications due to their inherent linearity of inductance vs. current. For this application, impregnated construction usually become the design of choice because its improves mechanical characteristics enabled the reactors to withstand higher fault currents. Dry type air core reactors are employed over the full range of distribution and transmission voltages, including EHV (high voltage series reactors) and (filter reactors, smoothing reactors) HVDC. This method of construction is extremely robust. Dry type iron core reactors can also be used at low voltage and indoors for applications such as harmonic filtering and power conditioning (di/dt, smoothing etc.).

Air cored reactors are manufactured by building the winding on a former with suitable insulations and spacers to hold the winding in strength and to restrain the turns from any movement caused by compressive forces. Reactors are made of Aluminium Copper winding without any core. The reactors can be assembled in vertical as well as horizontal construction.

Usually SVC reactors were imported from Austria for all these years.Now we have manufactured the largest SVC reactor in the country for 60 MVAR SVC system of ABB make.It has been successfully installed and commissioned at a SAIL steel plant since 2 years.

For efficient working of arc furnace, the electrode current should be low and the arc should be longer. To stabilize the arc, the series reactor is installed on primary side of the arc furnace transformer. These are normally in iron cored construction with forced oil and water cooling.

These reactors are used in power electronics applications such as UPS systems and variable speed drives. Use of these reactors reduces the magnitude of ripple current in DC system.

The Capacitor In-rush Limiting reactors are used in series with capacitor bank to control the in-rush current and to suppress the harmonics. Normally reactors with 0.2% rating are used for in-rush current limiting on neutral side and 6% for line side. Specific ratings between 0.8% to 13% are used for harmonic suppression.

We are the main supplier of this product.