POWER QUALITY SOLUTIONS

We have been supplying a wide range of L & T Switchgears Products to Various Industries, through our Work, we have built a reputation as a company that combines innovation with integrity with quality range.

Now, save more with L&T’s solutions for reactive power management and harmonic filtering. L & T offers a range of power capacitors for power factor correction for various applications.

Harmonic filtering for capacitor protection and preventing harmonic resonance and amplification can be achieved through the detuned filter reactors. In order to limit huge peak inrush current during switching of capacitors, L&T offers capacitor-duty contactor and thyristor switching modules for capacitor switching.
A range of APFC controllers for use in APFC panels is also available. Additionally, L&T also offers standardised panels for automatic power factor correction.

The etaCON series of digital power factor correction controllers automatically corrects the power factor, with the help of contactors for the connection and disconnection of capacitor banks. L&T offers a wide etaCON range: 3, 5, 7, 8 and 12-step versions. etaCON ensures balanced capacitor usage by intelligent adjustment interface based on the number of switching operations and the connection time of each step, thus ensuring long life for switchgear and capacitors.

Features:

Automatic set-up
Measurement Sensitivity - 2.5%
Automatic recognition of current flow direction
Use in co-generation systems - 4 Quadrant operation
Flashing of Alarm code in case of abnormal conditions
Online display of PF, Voltage, Current, kVAr, capacitor overload and Panel temperature
Two programmable contacts to be used as alarm and / or fan control except for etaCON 3
No-voltage release protection function
Capacitor over-current and panel over-heating protection
Average weekly power factor measurement (last 7 days)
Keypad lock feature

Thyristor Switching Module

With the thyristor module, we provide the main component - “The Electronic Switch”- for dynamic power factor correction. The LT-TSM series offers fast electronically controlled, self-observing thyristor switches for capacitive loads up to 50 kVAr, that are capable to switch PFC capacitors within a few milliseconds nearly without a limitation to the number of switchings during the capacitor lifetime. These switching modules are easy to install, have a fast reaction time of 5 msec and come with built-in indications of operations, faults and activation. These thyristor modules are very compact and operate at lower power losses.

Features:

Faster response time (5 ms)
High peak inverse voltage (2.2 kV) ensures long operational life
Automatic thermal cut-off
Monitoring of voltage, phase sequence, faults; display of status via LED
No system perturbation caused by switching operations (no transients)
No auxiliary supply needed
Maintenance free
No noise during switching
Compact design ready for connection and easy installation

Capacitor duty contactor- MOC

L&T’s range of capacitor duty Contactors is specially designed for capacitor switching applications. As capacitor switching is associated with high inrush current, the contactors are provided with damping resistors which limit the value of inrush current to a safe value. The contactors are used in APFC panels for switching power capacitors. Selection of these capacitors depends on the amount of reactive power compensation required.

Features

Separately terminated de-latching contacts for enhanced operational reliability
Improved switching performance
Dual contact gap for auxiliary contacts
Separate termination of damping resistors
Encapsulated resistor assembly
Wide and chatter-free operating band
Higher electrical life
Enhanced product safety

The increasing use of modern power electronic apparatus (drives, uninterruptible power supplies, etc.) produces nonlinear current and thus loads the network with harmonics. The capacitance of the power capacitor forms a resonant circuit in conjunction with the feeding transformer. Experience shows that the self-resonant frequency of this circuit is typically between 250 and 500 Hz, i.e. in the region of the 5th and 7th harmonics. Typical loads requiring harmonic filtering include 6 pulse drives (AC / DC), 3 phase UPS, frequency converters

Active Harmonic Filters

With L&T’s active harmonic filters, reduce your THD levels to within IEEE/CEA limits. These filters are IGBT-based power converters. This filter injects negative of the harmonic current resulting in practically no harmonic distortion. Phase balancing and power factor correction is also achieved.

Features:

30-600 A Active filter in 3 phase 3 wire/4wire
Stand-alone & modular units
Response time less than 1 ms
Easy diagnosis of fault conditions with alarms
Easy configuration & parameter monitoring with LCD touch screen HMI

Reactors – Harmonic Filtering

Detuned harmonic filters are the series combination of a reactor and power capacitor. This filter offers higher impedance for high frequency harmonics. This prevents harmonic resonance and amplification.

7% reactor mitigates 5th harmonic & above
- For industries with drives, converters & other power electronic devices
14% reactor mitigates 3rd harmonic & above
- For IT industries
- For industries with high single-phase non-linear load

Features:

Available as 7% (189 Hz) & 14% (133 Hz) detuned filters
Copper & Aluminum wound reactors
Very low operating losses - 3 to 5 W / kVAr
High linearity - 1.8 times the rated current
Low noise
Auto-thermal cut-off

Standard Duty Capacitors

L&T Standard Duty Capacitors are metalized polypropylene (MPP) capacitors. These capacitors come with a stacked winding and are impregnated with a non-PCB biodegradable soft resin. These capacitors are self-healing type. The Capacitors come with an over pressure disconnector and finger proof terminals.

Features:

Range available: 1-25 kVAr (Cyl) & 1-50 kVAr (Box)
Box & Cylindrical type construction (Resin-filled)
MPP technology with Self-Healing & Over-pressure Disconnector
Over current withstand capability - 1.5 In
Inrush current withstand capability - 200 In
Number of switching operations per year - 5000
Low operating loss (0.45 W/kVAr)
Application in agricultural pump-sets & small-scale industries

Heavy Duty Capacitors

L&T Heavy Duty Capacitors are metallized polypropylene (MPP) capacitors. The capacitors come with stacked windings. The box capacitors are impregnated with a non-PCB biodegradable resin The cylindrical Capacitors are subjected to an extended period of drying after which the casing is filled with an inert gas to prevent corrosion of the winding elements and inner electrical contacts. Compact design ensures space saving. Heavy Duty capacitors have a long life of 150000 hours.

Features:

Range available: 3-30 kVAr (Cyl) & 5-50 kVAr (Box)
Box (Resin-filled) & Cylindrical (Gas-filled) type construction
MPP technology with Self-Healing & Over-pressure Disconnector
Over current withstand capability - 1.8 In
Inrush current withstand capability - 300 In
Number of switching operations per year - 8000
Low operating loss (0.45 W/kVAr)
Application in commercial buildings with CFLs & SMPS, garment industries etc.

LTXL: Ultra-Heavy Duty Capacitors

The LTXL, ultra-heavy duty capacitors are advanced APP capacitors. They can withstand heavy load fluctuations, high inrush current and harmonics. They can be used in applications such as welding, steel rolling, etc., with heavy load fluctuations, high harmonic distortion levels (non-linear load >15%) and systems with high dv / dt. The capacitor is designed to operate at ambient temperature up to 70deg C.

Features:

Range available: 5-100 kVAr
Box type construction (Oil-filled)
Advanced APP technology with Internal Fuse
High over current withstand capability - 3 In
High inrush current withstand capability - 500 In
Improved operating life of capacitor - 300000 hours
More number of switching operations - 20000 operations/year
Lower operating losses - 0.35 W/kVAr
Suitable for harsh environments with heavy load fluctuations and high thermal loading