Method for Measuring Insulation Resistance
An electrical device’s insulation resistance can be measured using a variety of instruments.
- Direct-demonstrating ohmmeter with hand driven dc generator. This is privately known as hand driven megger . Since Megger is one of the most outstanding known producer of this instrument.
- Ohmmeter with direct indication and a dc generator driven by a motor. The local term for this is motorized megger.
- Direct-showing ohmmeter with independent battery.
- Direct-showing ohmmeter with independent rectifier. An external AC supply provides power to this instrument.
- With a self-contained galvanometer and battery, a resistance bridge circuit
Using an external dc supply, we can measure the resistance of the insulation. All things considered, we take voltage and current perusing with the assistance of a dc voltmeter and a miniature ran dc ammeter, separately.
R = V / I
In this scenario, we can use ohm’s law to determine the insulation resistance, where V is the reading from the voltmeter and I is the reading from the ammeter.
The ammeter is miniature run on the grounds that, an exceptionally small current finishes through the protection during assessment and he current is in that range as it were. However, the micrometer must measure both the absorption current and the initial capacitive charging current when the voltage is applied. Therefore, the ammeter ought to be able to withstand both of these currents at least initially. In the event of insulation failure while measuring, the voltmeter, ammeter, and source ought to be able to withstand a short circuit current.
At the point when we utilize direct showing ohmmeter of just megger, the leads of the instrument are associated across the protector to be tried. The insulation resistance value can be directly seen on the analog or digital dial of the instrument after it has been driven. In order to obtain a reading that is both more accurate and free of errors, the reading is taken after a standard time delay in both of the aforementioned methods of measuring insulation resistance.
Insulation Resistance – Power Generation and Distribution
Insulation resistance is a basic boundary in the domain of electrical engineering, filling in as a vital defense for the respectability and unwavering quality of electrical systems. This article dives into the central parts of Insulation resistance, investigating its definition, factors impacting it, techniques for estimation, systems for support, applications, and finishing-up experiences.
The ability of a material to prevent the flow of electric current is measured by its insulation resistance. It assumes an urgent part in forestalling spillage flows and guaranteeing the security and usefulness of electrical frameworks. An effective barrier against unintended current paths with a high insulation resistance safeguards equipment and prevents electrical accidents.
Table of Content
- What is Insulation Resistance?
- Factors Affecting Insulation Resistance
- Measurement of Insulation Resistance
- Required Tools for Measurement
- Method for Measuring Insulation Resistance
- Applications of Insulation Resistance