“K” Rated Isolation Transformers

GEESYS has a wide range of ISOLATION TRANSFORMERS which reduce the effects of power Line problems like noise, spikes, surges, transients and neutral, to a minimum Power generation in our country, is no doubt good and availability of continuous power is certainly better,but the stringent requirements of the sophisticated equipment being used today underlines necessity of clean power.

Owing to inductive loads, capacitive loads, SMPS loads, electronic ballasts and with PWM Switching systems, the present AC Power lines are superimposed with dangerous spikes, Surges, transients, sags and RFI noise and harmonics.

As a result failure rates of electronic equipment are on the rise. Without adequate protection, all electronic equipment is at a great RISK. Noise Cut-off (Ultra Isolation) Transformer cuts off noise, so your machine can perform with musical perfection.

Usually the failures are not seen right away. Repeated stress from normal electrical transients weaken components and lead to shortening of component life. Line noises like spikes, surges, transients and so on definitely cause stress on semiconductor components. And Machine Systems experience catastrophic program and software failures, extensive damage to PLC’s and storage media, leading to heavy losses of production, data and man-hours.

Isolation transformer is a transformer used to exchange electrical power from a wellspring of Alternating current (AC) power to some supplies or gadget while confining the controlled gadget from the power source, ordinarily for wellbeing. Isolation transformers give galvanic isolation and are utilized to ensure against electric shock, to smother electrical clamor in touchy units, or to exchange power between two circuits which should not be joined. Disengagement transformers piece transmission of DC signs from one circuit to the other, yet permit AC signs to pass.

An isolation transformer is a transformer, often with symmetrical windings, which is used to decouple two circuits. An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. They also block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers or laboratory instruments.

In electronics testing, troubleshooting and servicing, an isolation transformer is a 1:1 power transformer which is used as a safety precaution. Since the neutral wire of an outlet is directly connected to ground, grounded objects near the device under test (desk, lamp, concrete floor, oscilloscope ground lead, etc.) may be at a hazardous potential difference with respect to that device. By using an isolation transformer, the bonding is eliminated, and the shock hazard is entirely contained within the device.

  • Eliminates stresses that come from normal electrical transients.
  • Meet stringent clean power requirements of the sophisticated / sensitive equipments.
  • Effectively counter power line problems like Noise, Spikes
  • Protect Computers, CNC Machines and Telecommunication equipments from damage due to electrical noises, spikes etc.
  • If ground potential of system units are different from each other and are exposed to the effects of instability at high frequencies.
  • If ground of the equipment cannot be earthed.
  • To shield large number of electronic equipments which individually are producing different types of electrical noise at a common busbar typically CNC machines, Drives, Hardening equipment etc. The use of NCT, being bidirectional, prevents damage due to circulating noise interference within them.
  • To Protect against strong lightening, impulse noise, bus short-circuit, accidental discharge of capacitors
  • When multiple Noise Cut-off transformers are used, the suppression effects increase in proportion. Therefore, the effects of cascading Noise Cut-off Transformers is remarkable.

System Connections

Delta / star or Star / Delta

Ratios 1:1 and 2:1
Regulation Better than 3.5 °A
Power Factor 0.75 lag to 0.75 lead
Di-electric strength 2500 V AC for 120 Sec
Insulation resistance More than 1000 Mega Ohms
Coupling Capacitance 0.1 PF for 100 db
Leakage Current Less than 20 micro amps
Common Model attenuation 100 db
Construction Standards As per IS 2026 part 1 &11
  • CNC Machines
  • Bio Medical Equipments
  • Printing Machineries
  • Cell Phone Networks
  • Scientific Equipments
  • Textile Machineries
  • Oil &Vanaspathi Plants
  • Large Computer Installations
  • Garment Equipments ... and many more

All the types of electrical noises, predominantly common mode noises can be eliminated by Ultra Isolation Transformers. Since it isolates primary and secondary or separates neutral to ground bond on the secondary side, can be used to create separately derived source to combat current loops.

The Ultra Isolation Transformers are available in different levels of noise attenuation capabilities. The most commonly used are 100 & 120 dB. The coupling capacitance between primary and secondary is direct 1:1 relationship with dB levels. Some of the graphs herewith indicate different types of electrical noises observed in typical Engineering Industries & successfully eliminated.

Elecrical Noises are Generated due to :

  • Switching of electrical utilities like Capacitors, MCCBs, ACB's...etc. Larger the inductance of the system and larger the current change during switching, larger the magnitude of electrical noises.
  • The inductive loads like big Motors, Compressors, Overhead Cranes, Elevators, Presses etc. also generates substantial switching noises.
  • Switching equipments like Invertors, Converters, SMPS etc. generate electrical noises due to switching of Thyristors, Transistors, Relays etc.
  • Welding systems pollutes earthing systems, adds notches and high frequency noises in the wave form, generating power quality anomalies.
  • Lightening, precipitation of static charges and electrical discharges in the atmosphere are the natural cause of generation of various electrical noises.

Effects

  • Electrical noises are observed to occur over a wide band of frequency ranging from 1 KHz to 100 MHz and above. In magnitude observed to be as high as 4000 to 6000 Volts on 3 phase supply system.
  • The high frequency noise can interfere with digital electronic equipments causing untraceable data errors, change of programme, loss of memory, erratic behaviour, etc.
  • The high voltage spikes can cause the failure of Thyristors or Transistor, Micro Processors and other sensitive devices.
  • The radiated noise can interfere in operation of remote control equipment like Cranes, Digital Controls or Telecom Equipments.
  • Lightening, precipitation of static charges and electrical discharges in the atmosphere are the natural cause of generation of various electrical noises.
  • Protect Computers, CNC Machines and Telecommunication equipments from damage due to electrical noises, spikes etc.
  • If ground potential of system units are different from each other and are exposed to the effects of instability at high frequencies.
  • If ground of the equipment cannot be earthed.
  • To shield large number of electronic equipments which individually are producing different types of electrical noise at a common busbar typically CNC machines, Drives, Hardening equipment etc. The use of NCT, being bidirectional, prevents damage due to circulating noise interference within them.
  • To Protect against strong lightening, impulse noise, bus short-circuit, accidental discharge of capacitors
  • When multiple Noise Cut-off transformers are used, the suppression effects increase in proportion. Therefore, the effects of cascading Noise Cut-off Transformers is remarkable.

System Connections

Delta / star or Star / Delta

Related Standards IS 2026,IS 11171
Input & Output Voltaget 400-415V/400-415V/200V-220V/As Per Requirement
Rated HZ - 50 HZ +/-5%
Power factor  0.75 Lag to 0.75 Lead
Regulation Better than 3.5%
Vector group DYl 1** For Delta/Star
Efficiency Above 95%
 Impudence <4%
Coupling Capacitance O.OlPF for l OODb
Transformer type Core type
Insulation resistance Better than lOOO Mega Ohms
Insulation Class F
Insulation level 2.5 KV for 60Sec
No load losses Less than 3 -5%
Operating temperature 0-45*C
Noise Attenuation 120 DB up to lOKHz
Protection  IP 41/65
Name of the manufacture ABLE
Service Indoor
Type of cooling Natural Air

K-factor is defined as a ratio between the additional losses due to harmonics and the eddy current losses at 50Hz.

K-Factor is defined as a ratio between the additional losses due to harmonics and the eddy current losses at 50Hz. It is used to evaluate transformers for nonlinear loads. Transformers with a rated K-factor of 4, 7, 13, 20 and 30 are available.

The ANSI/IEEEE C57.110 has derived a system of weighing how much harmonic load currents a transformer can handle without exceeding its maximum temperature rise level. A K factor of 1 indicates no harmonics, while a K factor of 50 is the harshest harmonic environment possible. Typically a K Factor of 13 is sufficient for most applications. K factor must be determined to calculate the right size transformer that is needed.

Main Functional Features:

Effects of Harmonics

  • Overheating
  • Equipment Malfunctioning
  • Equipment Vibrations
  • Breakers Tripping
  • Copper windings
  • Lower Output impedance
  • Excellent transverse mode noise attenuation
  • Coil design is optimized for low eddy current loss and high harmonic current carrying capacity.
  • Cores designed for reduced flux densities to compensate for harmonic voltage distortion
  • Double size neutral terminal
  • Core of high quality electrical steel
  • Quiet operation
  • Ref StandardUL-1561, IEEE – C-57-110, I
  • Data Centres, Call Centres, IPO
  • Induction Heaters/Inverters
  • UPS, VFD’S & Drives
  • HID Lightings
  • Hospitals/Medical Centres, Research Labs
  • Corporate, Banking and Financial Institutions