January 15, 2026
Electric Energy Online

DOBLE ENGINEERING COMPANY
Calisto™ T1: All-in-One Condition Monitoring System

April 20, 2020

The Calisto T1 encapsulates the functionality of bushings, partial discharge and A/D modules in a single configurable package in a cost-effective manner. It provides the same clear user interface through a built-in server and manages user access, alert setting, alert management and data visualization bringing together data from Doble and third-party devices. Standard communication protocols include Modbus and DNP3 with optional IEC 61850, that allow data to be moved between Calisto T1 and other applications such as SCADA.

Features:

  • The Calisto T1 can build from a single component to a comprehensive transformer monitor covering partial discharge (PD), bushings, operational data and connects to Dissolved Gas Analysis (DGA) and third-party monitors.
  • PD Guard - Doble PD-Guard monitors partial discharge (PD) in the transformer bushings, neutral and inside the main tank; it provides local alarms and will communicate data and notifications across standard interface channels and to networked supervisory systems. Doble PD-Guard analyses PD and EMI signals in the HF, VHF and lower UHF ranges with built-in diagnostic tools.
  • IDD - Doble IDD bushing monitor detects deterioration in bushings, finding abnormalities in the insulation and issuing actionable alerts. It provides leakage current, phase, capacitance, power factor and harmonics analysis for up to six bushings individually. If a voltage reference is available, the Doble IDD will perform both relative and True Power factor to detect issues in bushings and voltage reference devices.
  • iO - Doble iO is a data recorder that accepts current, voltage, temperature and relay inputs and integrates and displays data from multiple sensors and sources, including load or operational data, tap position indicators and inputs from other vendor devices.

Benefits:

  • Simplify field configuration of condition monitoring installations
    • Configurable multi-functional monitoring in a single, small enclosure
    • Works within your firewall and meets your cybersecurity regulations
    • Visualize and overlay data from multiple assets through a single, intuitive UI
  • Comprehensive alert management
    • Set three levels of alert on each data channel
    • Alert default value available and user-configurable depending on application
    • Built-in audit trail of alert generation and acknowledgement for post-event investigation
  • Simplified upgrade path
  • Calisto T1 allows for field upgrade of hardware so that you can start small and grow
    • For example, start with IDD bushing monitoring and add main tank PD
  • Intuitive user interface

About Doble Engineering Company

The team at Doble Engineering Company ensures that all people have reliable, safe and secure energy. We do this by being the leading global provider of advanced diagnostics and engineering expertise for the energy industry.

Founded in 1920, Doble is committed to the continuing education of our customers, and the support and training of the next generation of power industry workers - uniting the utility sector for an innovative future.

Doble serves customers around the globe; our companies and product lines include Manta Test Systems, Morgan Schaffer, Vanguard Instruments, and Xtensible Solutions.

Doble is part of the Utility Solutions Group of ESCO Technologies Inc. (NYSE: ESE). For more information, visit: www.doble.com, follow us on Twitter @doble and connect on LinkedIn.

For more information

Doble Engineering Company
123 Felton Street
Marlborough Massachusetts
United States 01752
www.doble.com

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