Leakage Current Testers
GAOTek’s Leakage Current Testers measure the undesirable leakage current that flows through or across the surface of the insulation or the dielectric of a capacitor. This test is generally carried out at 100%-110% of the rated input voltage of the product under test. The maximum acceptable limit of a leakage current is generally 210 micro amperes. Some current will flow through the protective ground conductor in any electrical installation. This is termed as leakage current. The leakage current can unnecessarily cause intermittent tripping or it may cause a rise in voltage on accessible conductive parts. So by using a Leakage Current Tester, the source of leakage can be detected and this enables you to re-distribute loads around the installation in a more balanced way.
The Importance and Causes of Leakage Current:
The electrical equipment commonly includes a grounding system to give protection against a shock hazard in case of an insulation failure. The grounding system has grounding conductor that bonds the equipment to the service ground (earth). If there is a catastrophic failure of the insulation between the hot (power) line and touchable conductive parts, the voltage is shunted to ground. The resulting current flow will cause a fuse to blow or open a circuit breaker; preventing a shock hazard. Therefore, a possible hazard exists if the grounding connection is interrupted.
Insulation has both electrical resistance and capacitance and the current is conducted through both the paths. if the insulation is old or damaged, the resistance is lower and substantial current may flow and cause current leakage.
GAOTek Leakage Current Testers use the following technologies:
- Test device for earth leakage current and touch current
- Measurement circuit (according to European standards)
- Internal, potential-free source for the DUT supply
- Secondary-side detection of current and voltage
Measurement of Leakage Current to Ground
The leakage current is measured by connecting the load and switching it on.
Test single-phase circuits by clamping the phase and neutral conductor. The measured value will be any current flowing to ground.
Test three-phase circuits by clamping around all three-phase conductors. If a neutral is present, it should be clamped along with the phase conductors. The measured value will be any current flowing to ground.
Measuring leakage current through the ground conductor
The clamp meter is placed around the ground conductor to measure the total leakage flowing to the ground connection.
Measuring leakage current to ground via unintentional paths to ground.
Sometimes leakage occurs when electrical connections are given through unintentional paths to ground (such as the panel sitting on a concrete base). This leakage at the outlet is identified by clamping phase/neutral/ground together. Also, if other electrical connections exist ((such as a connection to a water pipe), a similar imbalance may result.
GAOTek Leakage Current Tester has following features
· True RMS Readings
· Reads in Measurement Indication Units (MIU) up to .005 MIU
· Output Allows Measurement of Peak Current in Non-Sinusoidal Wave Forms
· Let-Go, Reaction, and Burn Hazard Response Networks
· Detects dangerous AC & DC Leakage currents
· Includes Test Leads, Alligator Clips, Batteries and Manual
· Measurement of leakage current with 3 mA range and 1 µA of resolution, for accurate monitoring of insulation erosion
· Broad range of measurement, from 1 µA up to 60 A, for all installation needs
· Advanced shielding to ensure accurate results when measuring near other conductors
· The high durability clamp construction can withstand over 50,000 operations, added ruggedness that extends the life of your leakage clamp.
· Easy-to-carry, pocket-sized leakage current tester with wide 40 mm (1.5 in) jaw size
· Handy “Display-Hold” button for capturing leakage current readings in hard-to-reach places
· Auto power-off, with warning buzzer, saves battery life
· Conformance to IEC1010 and EMC standard for confident measurements
· Meets all of the applications and performance classes in safety standard VDE0404-4 and VDE0702 for leakage current and differential current measurement of electrical appliances
· Measurement of Leakage Current to Ground
· Measuring leakage current through the ground conductor
· Measuring leakage current to ground via unintentional paths to ground.
· Dielectric breakdown Test.
· Dielectric Withstand Test
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