Specialized Testing & Diagnostics
Service Scope for Testing & Diagnostics
Operation of Power Plants & Substations
Visual
Inspection
Checking tanks, bushings, cooling systems and seals for physical damage and leaks.
Oil Quality
Tests
Dissolved Gas Analysis (DGA), moisture content, acidity, interfacial tension and dielectric breakdown voltage to assess insulation oil health.
Partial Discharge (PD) Detection
locating insulation defects through acoustic or electrical sensors.
Polarity & Phase Relation Test
Verifying correct polarity and phase displacement for parallel operation.
Winding Resistance Measurement
Measuring DC resistance of each winding/tap to detect winding damage or connection issues.
Short‑Circuit Impedance & Leakage Reactance
confirming winding integrity and mechanical strength.
Insulation Resistance (IR) & Polarization Index
Assessing insulation condition between windings and core/tank.
Sweep Frequency Response Analysis (SFRA)
detecting winding deformation or core displacement by comparing frequency responses.
Partial Discharge (PD) Detection
locating insulation defects through acoustic or electrical sensors.
Transformer Turns Ratio (TTR)
checking the ratio and phase angle between windings to detect shorted or open turns.
Temperature Rise Test
verifying cooling performance under full load.
Substations & Transmission Systems
Busbar & Conductor Testing
micro‑ohm measurements for joint resistance, visual inspection of busbars.
Protection Scheme Checks
verifying differential, overcurrent and distance relays, interlocks and communication interfaces.
Instrument Transformers (CTs/VTs)
ratio, polarity, burden and excitation tests to ensure accurate measurement.
Partial Discharge & Thermography
detecting insulation defects and hot spots on busbars, bushing, GIS compartments, and cable terminations
Grounding System Tests
earth resistance, soil resistivity & bonding integrity to maintain safe fault current.
Metering & Power Quality Analysis
verifying accuracy, harmonics, voltage fluctuations and demand measurement.
Switchgear & Circuit Breakers (LV/MV/HV)
Routine Maintenance
visual inspection, cleaning, lubrication, tightening connections and checking auxiliary equipment
Insulation Resistance & Dielectric Tests
measuring insulation and performing High‑Potential (Hi‑Pot) tests to verify withstand capability
Protective Relay Testing
checking relays for correct pickup, timing, trip functions and scheme logic
Circuit Breaker Diagnostics
measuring contact resistance, timing/travel, trip/close coil currents and insulation condition
Functional Testing
verifying correct operation of breakers, isolators, relays, switches and control circuits
SF6 Gas Quality (for gas‑insulated switchgear)
analysing moisture and purity, leak detection.
Performance Testing
evaluating response times of protective relays and coordination of protective devices
Documentation & Record Keeping
maintaining test results and maintenance history for compliance.
Ring Main Units (RMUs)
Visual Inspection & Safety Checks
verifying physical condition, grounding and signage.
Functional & Interlock Checks
ensuring breaker, disconnector, and fuse interlocks operate correctly.
Earth Fault Indication & Earth Resistance Tests
verifying fault indicators and measuring ground resistance.
Contact Resistance Measurement
using a micro‑ohmmeter to test main circuit breaker contacts across phases.
High‑Voltage Withstand (Hi‑Pot) Test
applying elevated voltage to verify dielectric strength.
Thermal Imaging & Protection Settings Verification
detecting hotspots and verifying relay settings.
Insulation Resistance Test
applying 5 kV DC megger to each phase and ground before and after high‑voltage testing.
Generators & Motors (Diesel, Gas, Steam, Hydro)
Electrical Tests
Insulation Resistance, HiPot, Power Factor/Tan Delta, Partial Discharge Detection, Winding Resistance.
Stator & Rotor Core Testing
electromagnetic core imperfection detection (EL‑CID), flux measurement and rotor balancing.
Mechanical Diagnostics
vibration analysis and thermographic inspection to evaluate bearings and structural integrity.
Lubricating & Cooling Systems
oil quality analysis, filter replacement, heat‑exchanger cleaning and pump overhaul.
Load Bank Testing
verifying output capacity, voltage regulation and frequency stability under real or resistive load.
Excitation & Control System Checks
verifying AVR response, droop settings and governor operation.
Rotor/Field Tests
winding resistance, advanced surge and impedance testing, pole drop test.
Overspeed & Run‑ Down Tests
ensuring mechanical safety and protective trip functions.
Power Plants (Thermal, Combined Cycle & Cogeneration)
Repairing and maintaining power plants involves:
Turbine & Boiler Inspections
NDE techniques (ultrasonic, radiography, phased array) to inspect boilers, condensers, feedwater heaters, high‑energy piping and turbine components.
Leak Detection
acoustic systems detect through‑valve leaks in steam valves.
Boiler & HRSG Condition Monitoring
detecting tube leaks, erosion, corrosion, overheating, hydrogen damage and other failure mechanisms; inspection services identify tube leaks, slag build‑up, sootblower effectiveness and valve leakage
Turbine Inspections
semi‑annual borescope inspections, baseline assessments, outage planning, rotor and diaphragm inspection, valve and lube‑oil piping checks.
Acoustic Emission Monitoring
online systems (e.g., AMS™) detect boiler tube leaks early, providing real‑time data and preventing secondary damage.
High‑Energy Piping (HEP) Inspection
material and weld verification, hanger inspection, fluoroscopy, acoustic emission monitoring and engineering program development for main steam, hot/cold reheat, and boiler feed systems.
Solar Power Plants & Renewable Assets
Common Tests & Inspections
six types of tests across the PV lifecycle: intermediate site acceptance, final acceptance, annual maintenance, technical due‑diligence, troubleshooting and damage evaluation.
Insulation & Continuity Tests
verifying DC insulation resistance between strings and ground and continuity of strings, compliance with IEC 62446
Short‑Circuit Impedance & Leakage Reactance
confirming winding integrity and mechanical strength.
String I‑V Curve Scanning
connecting an I‑V curve tracer to PV strings, measuring voltage and current over a range, plotting curves, correcting to standard test conditions and comparing with baseline measurements to identify shading, soiling or mismatch issues.
Spare Parts & Inventory Management
ensuring availability of inverters, modules, fuses, connectors, and monitoring hardware.
Earthing & Lightning Protection Tests
measuring earth resistance and verifying proper bonding.
Infrared Thermography
drone‑based or handheld IR cameras detect thermal anomalies in modules, inverters and connections; inspections comply with IEC TS 62446‑3 and include geolocation, anomaly classification, failure analysis and maintenance planning.
Module Cleaning & Vegetation Management
planning cleaning frequency, using demineralized water and biodegradable detergents to preserve module warranty, and controlling vegetation to reduce shading.
Performance Ratio & SCADA Monitoring
remote monitoring of power output, irradiance, temperature, and inverter efficiency; performance analysis triggers preventive actions.
Electroluminescence (EL) Imaging
identifying micro‑cracks and hidden defects by applying forward bias to modules and capturing EL images.
Cables & Accessories
Insulation Resistance & Hi‑Pot Tests
verifying installation quality and cable health.
Tan Delta Analysis
measuring dielectric dissipation factor to assess insulation degradation due to water treeing or aging
Partial Discharge (PD) Diagnostics
detecting and locating incipient insulation defects
Time Domain Reflectometry (TDR)
locating faults along cables by measuring reflection times.
Sheath & Bonding Tests
checking for sheath integrity and verifying cross‑bonding.
Very Low Frequency (VLF) Withstand Testing
a well‑established method for assessing insulation and detecting defects in medium‑voltage cables, providing a more efficient and portable alternative to 50/60 Hz testing.
We Are Certified Experts
Why Choose Blackstone Energy
- Results-Driven Execution
Backed by years of field experience, our team specializes in high-voltage testing and the life-cycle management of critical power assets. We deliver precision-driven diagnostics to ensure your infrastructure remains resilient.
- Customizable Options
We understand that every power plant and substation is unique. Our R&M services are tailored to your specific technical needs, from individual equipment testing to complete long-term agreements.
- Quality Assurance
Our operations are fully certified to ISO 9001, 14001, and 45001 standards. We prioritize rigorous HSE protocols and international engineering benchmarks to guarantee consistent performance and on-site safety.
- Latest Tools & Technologies
We utilize state-of-the-art diagnostic tools, including TRAX 280s and Doble test kits, along with mobile laboratories to provide rapid, data-driven insights that maximize your asset life and grid compliance.
