Testing and Commissioning
Distribution Transformer Tests
- Core
insulation tests
- Operational
checks on protection system
- Insulation
resistance (IR) measurement
- Capacitance and dissipation factor
(tanδ) measurement of bushings.
- Capacitance and dissipation factor
(tanδ) measurement of windings
- Turns
ratio (Voltage ratio) measurement
- Vector
Group and Polarity
- Winding
resistance measurement
- Magnetic
Balance test
- Floating
neutral point measurement
- Measurement
of short-circuit impedance
- Exciting / Magnetizing current
measurement
- Vibration measurement of oil‐immersed
reactor
- Operational
check on OLTCs
- Stability of differential, REF of
transformer / reactor
bushing
current transformers tests
- Frequency response analysis (FRA)
measurement
- Dissolved gas analysis (DGA) of oil
sample
- Thermovision
infra‐red scanning
Protection Relays Tests
- Wiring
diagram check
- General
equipment inspection
- Insulation
resistance measurement
relay self-test and
external communications checks on
digital/numerical relays
- Measurement
test
- Trip
settings test
- Secondary
injections
- Primary
injection tests
- Protection
scheme logic test.
Metal Glad Switchgear Testing
- Mechanical Checks and Visual
Inspection
- Insulation Resistance Test
- Contact Resistance Test
- High Voltage Test