ISA / Doble
STS 5000
Multifunction primary injection test system for substation apparatus.
- Current and voltage transformer testing
- Power transformer testing
- Ground-grid testing
Rugged Monitoring / Doble-Megger
Transformer Monitoring
Early insight into the condition of your transformers.
Expertise for your application.
Build a clearer picture of transformer condition with continuous monitoring of thermal and insulation performance. Rugged Monitoring combines sensors, edge devices and asset software to help identify changes that need attention.
Fibre-optic temperature sensing provides direct, accurate measurement in demanding high-voltage environments, improving visibility of transformer thermal performance and supporting loading, reliability and asset-life decisions. Equinox supports these technologies for individual transformers and wider fleets across Africa.
Read more: Rugged transformer monitoring (opens in a new tab)Rugged Monitoring / Doble-Megger
Technology in context.
Rugged Monitoring combines sensors, local acquisition and asset software to track transformer condition across individual units or a fleet.
Monitoring and testing throughout the lifecycle
Transformer assessment brings together online temperature and condition monitoring with offline electrical tests. Explore the related instrument ranges for winding measurements, current/voltage transformer tests, insulation diagnostics, dissolved-gas analysis and partial-discharge assessment.
Watch the critical components
Monitoring can combine winding temperature, bushing condition, partial discharge, tap-changer behaviour and cooling performance. Dissolved-gas information adds another view of insulation condition.
Connect the operating history
Edge devices collect time-aligned measurements for local analysis and RM EYE. Historical records and alarms help teams compare changing condition with operating context.
Complement monitoring with transformer tests
Megger TRAX, TTRU3 and FRAX support planned transformer investigations, while the Expert S1 range adds insulation-resistance testing. Select offline tests to investigate condition changes alongside the continuous monitoring programme.
Capabilities
- Online dissolved-gas, hydrogen, moisture and temperature monitoring
- Fibre-optic winding-hotspot sensing
- Bushing capacitance, tan-delta and partial-discharge assessment
- Offline CT, VT and power transformer testing
- Winding resistance, ratio per tap and dynamic OLTC tests
- Transformer demagnetisation and sweep-frequency-response analysis
Applications
Where it fits.
- Power transformers
- Distribution transformers
- Dry-type transformers
- Reactors
Choosing your solution
What to consider.
- Which failure modes need coverage?
- Which sensors are already installed?
- How will alarms reach operators?
- What outage access is available?
Find your technology
Transformer monitoring
Explore the range and compare the capabilities that matter to your application.
Available models
20 models and ranges
Primary injection, earthing and transformer tests
ISA / Doble
STS 4000
Multifunction test system for transformers and substation earthing.
- CT, VT and power transformer tests
- Ground-grid measurements
ISA / Doble
iCT1
Combined current and voltage transformer test set using a DC test method.
- Tests CTs with saturation voltage up to 30 kV using a low-voltage DC method (original specification)
- Five-tap switchbox
- CT and VT assessment
- Single setup connection for supported CT tests; the integrated switchbox avoids manual reconnection between tests
ISA / Doble
TD 5000
Tan-delta and capacitance testing system that complements the STS range.
- Mains-frequency or variable-frequency measurement
- Insulation-condition assessment
ISA / Doble
Bushing tap adapter kit
Adapter kit for capacitance and tan-delta tests on transformer bushings.
- STS 5000 + TD 5000
- STS 4000 + TD 5000
- TDX 5000 compatibility in the original range
ISA / Doble
STCS PLUS
External switching module for automated power-transformer testing.
- Single initial connection arrangement
- Automated test sequences
ISA / Doble
STCS switch module
Switching module for completing transformer tests from one connection setup.
- Ratio per tap and winding resistance
- Dynamic on-load tap-changer testing
ISA / Doble
20 A DC booster
Winding-resistance test accessory for the STCS system.
- Test current up to 20 A DC
- Used with STS 5000 or STS 4000 and the STCS module
ISA / Doble
STDE transformer demagnetiser
Accessory for reducing residual core magnetisation after DC winding-resistance tests.
- Alternating-polarity current applied to the transformer winding
ISA / Doble
STS 3000 LIGHT
Insulation test system retained from the original ISA equipment range.
- Tan-delta and capacitance measurements
- CT, VT, power transformer and circuit breaker applications
Earlier ISA model — discuss support and current alternatives.
ISA / Doble
SFRA 5000
Standalone sweep-frequency-response analyser for transformer assessment.
- Portable frequency-response measurement
- Complements STS and TD 5000 test systems
- Repeatable transformer measurement workflows
Original SFRA 5000 range — confirm support and current configuration.
Fibre-optic temperature monitors
Rugged Monitoring
T301 temperature monitor
Fibre-optic temperature monitoring for continuous operation and equipment testing in demanding environments.
- Energy and industrial applications
- Mobility, aerospace, defence and oil-and-gas applications
Fibre-optic temperature sensors
Rugged Monitoring
TSENS transformer sensor
Fibre-optic sensor for direct winding-hotspot temperature measurement.
- Transformer and motor winding applications
- Torlon disc mounting between coils
- Dielectric probe design for high-voltage environments
- Original dielectric specification: less than 2 pC partial discharge under extra-high voltage
Doble transformer gas monitoring
Doble
Calisto 9
Online dissolved-gas analysis for detecting and diagnosing developing transformer faults.
- Condition-based maintenance
- Transformer loading decisions
Doble
Calisto H1
Continuous hydrogen monitoring for transformer oil.
- Solid-state hydrogen sensor
- Tracks hydrogen changes that can indicate an electrical fault
Transformer condition integration
Doble
Calisto T1
Configurable monitoring platform bringing bushing, partial-discharge and input/output functions together.
- Built-in web server
- User access, alerts and data visualisation
- Combines Doble and third-party device data
Megger transformer diagnostics
Megger
TRAX
Multifunction test system for transformer diagnostics and substation maintenance.
- Winding resistance, turns ratio and core demagnetisation
- Dynamic resistance assessment of on-load tap changers
- 12 kV power factor / tan delta with the optional TDX120 accessory
Megger
TTRU3
Three-phase transformer turns-ratio tester with simultaneous measurement and integrated tap-changer control.
- Step-up excitation with up to 250 V induced
- Single three-phase lead-set connection
- Touch-screen test plans and Excel / PDF results
Megger
FRAX150 / FRAX200
Sweep-frequency-response analysers for investigating mechanical and electrical changes in power transformers.
- Compare winding responses with reference measurements
- Analysis software for phase and historical comparisons
- FRAX200 adds demagnetisation and automatic ground-loop checks
Megger insulation testing
Megger
S1-568/2 / S1-1068/2 / S1-1568/2
Expert insulation-resistance testers for transformers, cables and switchgear in electrically noisy environments.
- 5 kV, 10 kV and 15 kV model choices
- Adaptive filtering and 8 mA noise immunity
- Insulation resistance, polarisation-index and diagnostic test modes
No matching models.
Try fewer filters or a different keyword.
Go further
Further information.
Explore the information for your application, then speak to our team about selection and support.
Enquire about this rangeExplore related solutions.
Transformer Monitoring
Let’s find the right solution.
Tell us about your application. We’ll help with options, pricing and next steps.