 | Low through High Voltage Substations |
| Oil Handling & Processing |
| Cable Locating & Fault Location |
| AC & DC Hi-Potential Testing |
| Power Circuit breaker Testing |
| Relay & Meter Calibration |
| Infrared Thermo-graphic Survey |
| Corona Scan |
| Transformer Testing & Commissioning Low through
High Voltage |
| Oil & SF6 Power Circuit Breakers |
| Insulating Liquid Analysis |
| Ground Testing |
| Generator Load & System Testing |
| Control System Acceptance Testing |
| Battery Testing |
| UPS Acceptance Testing |
| Electronic Interference Measurements |
| Provide you with complete substation/transformer
commissioning as a contractor on a turn key project, or as a subcontractor |
| Procurement of new or refurbished transformers
|
| Dismantling and disposal of all transformers
|
| Vacuum Filling to ensure that no moisture or air
enters your oil
|
| Complete Turnkey Transformer Installation
Management
|
| Transporting
|
| Receiving inspection and testing
|
| Assembly
|
| Dew Point Testing
|
| Pressure Testing/Nitrogen Blanket Application |
Dielectric Strength: (D877 & D1816)
Dielectric breakdown voltage of insulating oil is a
measure of its ability to withstand voltage stress without failure. It is the
voltage at which breakdown occurs between two similar electrodes under defined
test conditions. The test serves primarily as an indicator of the presence of
electrical conductive contaminants in the oil, such as water, dirt, moist
cellulosic fibers and particulate matter.
Two methods are used for measuring the dielectric breakdown voltage of
insulating oils, as follows:
a) ASTM D877 is generally recommended for routine acceptance of new, unprocessed
oil from a supplier for use in circuit breakers. The test method uses thin
flat-faced parallel cylindrical electrodes with a 2.5 mm gap. This method is not
as sensitive to the general population of contaminates present in a liquid
sample and is less sensitive than that of D1816 particularly with reference to
water content and cellulosic fibers.
b) ASTM D18l6 is the recommended test for fluid that is being processed into
transformers or contained in transformers and load tap changers. The method uses
spherically shaped electrodes rather than flat disc or cylindrical-shaped as in
D877. The fluid sample is circulated continuously in the test cell throughout
the test by mechanical means. The gap distance standard settings are 1 mm and 2
mm with the 1 mm being used by our laboratory.
We current support both TOA 3.3c and TOA4
Online version, which is an Internet web-based software. Both versions interpret
dissolved gas and insulating fluid test data for power transformers and other
liquid-filled electrical apparatus such as load tap changers, regulators and oil
circuit breakers. It provides a variety of reports and graphs to support basic
testing, condition assessment and maintenance tasks. Automatic dissolved gas
analysis and fluid quality analysis employ up-to-date methods which have been
mathematically enhanced to account for measurement "noise" often found
in DGA data. Trends and rate of changes are also provided for in this analysis.
TOA$ reports may be accessed on the internet once a client account has been set
up and information stored to this on-line storage file.
