“Inductor is a from of coil in which number of turns of insulated wires been wrapped. It stores energy in the form of electromagnetic field. “
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The powerful electrical machine contains coils connected in a particular pattern. That total pattern is known as winding. Winding is the softest part That’s why winding is properly insulated; placed inside the winding slots through insulation.
Insulation of the wires should be in a range so that it withstand the surge voltages, Even in worst working environmental conditions like high temperature & humidity.
INSULATION RESISTANCE
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“Insulate defines separatism & Insulation is a type of layer which prevents the energy leakages. Energies like heat, Electricity & light etc. In Electrical, insulation is a type of layer around the conductor which prevents the potential/current leakages by providing high resistance.”
Insulator materials are used to make an insulation around the conductor, So that current only flows in defined path. The breakdown voltage of insulation around the conductive part is multiple times higher than the system voltage, So that insulation works perfectly even in surge voltage scenario.
Like any other things, The insulation also has a life Which get deteriorates. Its resistance value get lowered due to ageing & continuous wear-tear. Resistance Below the standard range, shifting the system into a danger zone. That’s why monitoring of the insulation resistance is very important Which should be recorded at regular intervals. Regular continuous records makes the chances of unwanted instant breakdown lowered.
In this busy world, It is difficult & cumbersome to record the insulation of the system at regular basis. Task get even worse, When there are multiple number of systems. To make the things easy for insulation measurement, There are devices which continuously monitors the insulation of the system; parallelly in the mean time of system’s working condition.
To understand these devices better, We are going to discuss insulation measurement device isometer IR425 by Bender.
BENDER’S ISOMETER IR425
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FEATURES OF ISOMETER IR425 BY BENDER
- Measures resistance of AC/DC system up to 300Volts.
- Facility of pre-alarm & final alarm
- LED’s indication for power, Pre & final alarm.
- Two Changeover relays for both pre & final alarms.
- Compact & Easy DIN design
- Test & Reset buttons are available.
- NO or NC operation is Selectable.
- Adjustable Response delay.
- Digital display which shows present insulation & easy key pad to change the parameters.
CIRCUIT DIAGRAM
- Terminals L1,L2 connects to the systems wires whose insulation been tested.
- KE & E are the earthing terminals.
- A1,A2 are the auxiliary power supply of the device.
- Device can be test or reset through T/R terminal.
- There are two changeover relays K1 & k2 Whose terminals are 11,12,14 & 21,22,24 respectively.
Total circuit diagram is shown in an diagram below:
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TECHNICAL SPECIFICATIONS
- SUPPLY OF DEVICE
- SUPPLY OF SYSTEM BEING MONITORED
Voltage Range // AC/DC 0 . . . 300V (Terminals L1 & L2)
Frequency Range // 15 . . . 460Hz
- RESPONSE VALUES (IT is the value in between alarm operates)
- MESAURING CIRCUIT
- DISPLAY, MEMORY
- SWITCHING ELEMENT
- OTHER DETAILS
SUMMARY
Transformers and motors, crucial electrical machines, utilize inductors to store energy as electromagnetic fields. Their windings, composed of insulated coils, require robust insulation to prevent energy leakage and withstand harsh conditions.
Insulation resistance detection is vital as it deteriorates over time, potentially leading to system failures. The Bender Isometer IR425 effectively monitors insulation in AC-DC systems up to 300 volts, providing real-time resistance readings and alarms for potential failures. Key features include a digital display, manual test functionality, and dual relay alarms. Regular monitoring ensures operational safety and reduces the risk of breakdowns in complex systems.