Testing Equipment
IES performs comprehensive electrical testing and inspections with the use of state-of-the-art test and measurement instruments.
Type of Test
- Contact Resistance
- CT circuit continuity
- Dielectric withstand voltage(2KV AC)
- Excitation current
- Excitation curve
- Ground Resistance
- Leakage reactance
- Measurement of complex impedances
- Phase and magnitude error
- Ratio, burden and polarity
- Secondary burden
- Short-circuit impedance measurement
- Single phase testing of relays
- Tap changer testing
- VT circuit continuity
- Winding resistance
- Current Injection up to 2,000 Amperes
Applications
- Power Transformer
- Current Transformer
- Voltage Transformer
- Resistance Testing
- Protection Relays
- Tangent Delta/Power Factor Test
- Line and Ground Impedances
- K-Factor
- Mutual Coupling
Measurement Capabilities
- Capacitance Cp
- Dissipation factor tan δ (tangent delta)
- Power factor cos θ
- Power (active, reactive,apparent)
- Impedance (absolute value, phase, inductivity, resistance, Q)
Protection Relay Testing
- Electromechanical relays
- Static relays
- Numerical relays
- IEC 61850-complianti IEDs
- Relay panels
- End to end testing with GPS or IRIG-B
- Busbar Protection
Other Capabilities
- Transient fault simulation
- Power Swing
- CT saturation simulation
- CB simulation
- Compensated network
- Transient Playback
- Checking SCADA annunciations
- Burden measurement
- CT/VT polarity checker
- Wiring checker
- Event recorder
- Plausibility check for CT/VT with primary injection
Applications
- Oil-paper insulations
- Power transformer
- Bushings
- Paper-mass insulated cables
- Generators and motors
Measurements Performed
- Dissipation factor, capacitance, permittivity, resistance and polarization current of HV insulations
- Aging detection for bushings
- Moisture analysis in oil-paper insulations
- Diagnosis of oil-paper insulations in HV bushings, generators, motors, and power cables
Diagnostics Performed
- Transformer check after short-circuit testing
- Transformer integrity verification after transport
- Transformer condition assessment after the occurence of high transient fault currents
- Routine diagnostic measurement
- Diagnosis after transformer alarm or protection tripping
- Testing after significant changes of monitored values (e.g. increased total dissolved combustible gases(TDCG) in oil)
- Further investigation of unusual routine test results
- Scientific investigation
SFRA can detect the following
- Winding deformation (axial and radial, such as hoop buckling, tilting and spiraling)
- Displacements between high and low voltage windings
- Partial winding collapse
- Shorted or open turns
- Faulty grounding of core/screens
- Core movement
- Broken clamping structures
- Problematic internal connections
Other Equipment
