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High frequency earth ground tester
- Intended for measurement of earth resistance of electricity pylons
- Minimizes the influence of adjacent pylons, connected by the guard cable
- Operation frequency: 25 kHz
- Resistance reading: up to 300 Ω
- Automatic compensation of inductive component
- Automatic current injection
- USB interface
- Built-in memory and printer
- Rechargeable LFP battery
Overview
Specifications
Accessories
Testing of the power transmission towers grounding (G) quality poses a serious problem as they are all electrically interconnected by means of Ground Wires which act as lightning rods, protecting the lines from atmospheric discharges. Due to the existence of this connection, any attempt to measure a tower grounding (G) resistance using a conventional earth meter leads to wrong results as what is really being measured is all the shunt towers grounding (G) resistance (or, more precisely, its impedance at low frequency).
To make this kind of test feasible, which is of vital importance to ensure the transmission of the electrical power without interruptions, MEGABRAS TM25t grounding resistance meter for high frequency has been developed. This is the appropriate tool for a fast, safe and reliable grounding resistance measurement in each tower of a working line transmission, without disconnecting the ground wire.
Its operation is based on the use of a high-frequency measurement current (25 kHz), for which ground wire inductive impedance - taking into account a typical length span - is reasonably high, making it possible to reduce the effect of the adjacent towers under measurement. The equipment only measures the ground resistance of the surveyed tower, including its base. The extensive G systems, such as meshes, buried wires, metal pipes, etc, are measured only considering the closest section to the connection point, so that the measured value represents the performance against a pulse signal similar to an atmospheric discharge. Thus, values that better represent the system capacity to ground lightning currents than the ones obtained with low frequency conventional equipments, even when disconnecting the ground wire, are obtained.
TM25t is a strong equipment, easy to carry, resistant to the hard weather and geographical features of the tropical and high-mountain regions, that is why it is described as an excellent product for field works under the most severe environmental conditions.
To make this kind of test feasible, which is of vital importance to ensure the transmission of the electrical power without interruptions, MEGABRAS TM25t grounding resistance meter for high frequency has been developed. This is the appropriate tool for a fast, safe and reliable grounding resistance measurement in each tower of a working line transmission, without disconnecting the ground wire.
Its operation is based on the use of a high-frequency measurement current (25 kHz), for which ground wire inductive impedance - taking into account a typical length span - is reasonably high, making it possible to reduce the effect of the adjacent towers under measurement. The equipment only measures the ground resistance of the surveyed tower, including its base. The extensive G systems, such as meshes, buried wires, metal pipes, etc, are measured only considering the closest section to the connection point, so that the measured value represents the performance against a pulse signal similar to an atmospheric discharge. Thus, values that better represent the system capacity to ground lightning currents than the ones obtained with low frequency conventional equipments, even when disconnecting the ground wire, are obtained.
TM25t is a strong equipment, easy to carry, resistant to the hard weather and geographical features of the tropical and high-mountain regions, that is why it is described as an excellent product for field works under the most severe environmental conditions.
Remote control by device with Android™
This instrument has Bluetooth® interface and can be controlled remotely via a smartphone / tablet with Android™ running the BlueLogg application.
Available on Google Play
Source code
• Android and Google Play are trademarks of Google LLC
• Bluetooth is a registered trademark of the Bluetooth SIG, Inc. Worldwide
Source code
Available on Google Play
• Android and Google Play are trademarks of Google LLC
• Bluetooth is a registered trademark of the Bluetooth SIG, Inc. Worldwide.
Source code
Rechargeable battery (LiFePO4)
Expected lifetime:
2000 charge / discharge cycles (average).
Low self-discharge:
When the equipment is not in use, battery charge decreases with time at a much lower rate than other battery technologies.
Safety:
In contrast to other lithium battery technologies commonly used, LFP batteries are thermally and chemically stable, significantly improving battery safety.
2000 charge / discharge cycles (average).
Low self-discharge:
When the equipment is not in use, battery charge decreases with time at a much lower rate than other battery technologies.
Safety:
In contrast to other lithium battery technologies commonly used, LFP batteries are thermally and chemically stable, significantly improving battery safety.
Images for illustration purposes only. Megabras reserves the right to change design and specifications without prior notice. Accessories with 6 months limited warranty.
EQUIPMENT WITH 2 YEARS WARRANTY
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