hi tech Villivakkam, Chennai, Tamil Nadu

Power Factor Control Relays     BLR CXD, tamper proof range   BLR CX, standard full Featured range   BLR CM, integrated power quality metering & communication   BLR CM3A, comprehensive 3xCT regulator and metering solution   Thyristor Swtiches     BEL Ts, range of thyristor switches for LV Capacitors   Capacitorn Protection Relays     KSR, protection relays for HT capacitor banks

  True RMS AC Voltage Single voltage up to 480 Volts; phase-phase voltage up to 600 V.   True RMS AC Current up to 6500 Amps (according to CTs used).   DC measurements with optional CTs.   Peak Voltage and current.   Frequency.   Active, reactive and apparent power per phase and their aggregate.   Active, reactive energy - consumed and produced (export / import).   Harmonics for voltage, current up to the 50th order.   VA harmonics up to 50th order.   Flicker measurements.   Information on whether harmonics are generated or received with details of zero, +ve and -ve   sequence harmonics.   Export & Import measurements.   Neutral current.   Crest Factor for V and I.   K factor for currents.   Displacement factor and Tangent.   V and I unbalance in %.   Total Harmonic Distortion Factor.   Inrush capture.   Transients - 1 cycle pre-event and 3 cycles post-event recording.   Salient Features       Large Colour LCD screen for graphical menu-driven display.   Continuous cycle by cycle measurement of all 3 phases and 3 voltages @256 samples/cycle - for   accurate and dependable measurements even on non-linear loads.   Wide choice of clamp-on CTs to measure currents from 100mA to 6500A-options include   5/100A CT, 1000A CT, 6500A Ampflex CT, 1000A AC/DC CT.   5 Voltage Inputs (R, Y, B, N & Earth voltages)   4 Current inputs (R,Y, B, N)   Suitable for 2 wire, 3 wire & 4 wire measurements.   Various display modes - Harmonics mode, waveform mode, power/energy mode, record mode,    alarm mode.   Alarm recording - captures up to 4096 alarms and can program parameter, minimum / maximum   value, hysterisis and minimum duration for detection (minimum ½ cycle detection).   2 GB data storage capacity with programmable interval for data collection from 1s to 15min.   Different parameters can be recorded under 4 user-defined configurations; Multiple record sessions   can be carried out without deleting data.   12 pictures record facility for later viewing on meter screen and download to PC.   RS - 232 serial port for communication and data transfer to a PC.   Recorded data can be viewed as trends on the meter screen for quick analysis on the field minimising   dependence on PC; Zoom-in/ Zoom-out facility for better resolution enabling in-depth analysis.   Software part of the kit.   Up to 10 hour battery backup for un-interrupted field studies.

A passive harmonic filter is built using an array of capacitors, inductors, and resistors. It can take the form of a simple line reactor or may use a series of parallel resonant filters to eliminate harmonics. Passive harmonic filters are also divided based on the way they are connected with the load.   A series filter: Here the filter is placed in series with the load and uses parallel components, i.e., inductors   and capacitors are in parallel. This filter is a current rejector.   A parallel filter: The filter is placed in parallel with the load and its components are built in series. This   filter is a current acceptor.   Based on the components used to build the passive filter, there are the following types       A Band-pass filter is a common passive filter that is built using a capacitor connected in series with a   resistor.   A High-pass filter has a resistor connected in parallel with a reactor. This helps in reducing the q value of   the filter, which will in turn help reduce the higher frequencies.   A High-pass filter when used in combination with a band-pass filter will provide a solution for medium   voltage and sub-transmission voltage networks, which have moderate harmonic distortions.   A C-type filter is used for complex loads, cyclo converters and electric arc furnaces and is a special   variation of the high pass filter. This filter will provide the load with reactive power and avoid forming parallel resonance circuits with the load.

An active harmonic filter is something like a boost regulator. The concept used in an active filter is the introduction of current components using power electronics to remove the harmonic distortions produced by the non-linear load. Active harmonic filters are mostly used for low-voltage networks.There are three types of active harmonic filters based on the way they are connected to the AC distribution network.     The series filter is connected in series with the AC distribution network. It serves to   offset harmonic distortions caused by the load as well as that present in the AC system.   The parallel filter is connected in parallel with the AC distribution network. Parallel filters   are also known as shunt filters and offset the harmonic distortions caused by the non-linear load.   The hybrid filter is a combination of an active and a passive filter and could be of a series   or a parallel configuration.   Apart from the above classification, active harmonic filters can be either 3-wire or 4-wire filters. 3-WIRE FILTERS: Are power units that are large and typically used in variable speed drives and other such applications, which have a large number of non-linear loads.4-WIRE FILTERS: Are those that can filter the neutral conductor of the triple-n harmonics. These filters are used to eliminate harmonics that are generated by switch-mode power supplies and Information Technology equipment, typically commercial applications.