Adiradh offers the STS 4000 Multifunction Substation Test Set for electrical testing, commissioning and maintenance of substation equipment. It combines several testing functions in one instrument. Therefore, engineers can test different types of electrical equipment using a single system.
Moreover, the STS 4000 supports testing of current transformers (CTs), voltage transformers (VTs), potential transformers (PTs) and power transformers. It also provides primary current injection up to 800 A. In addition, its variable output frequency ranges from 15 Hz to 500 Hz. As a result, engineers can perform different electrical tests with suitable output settings. Furthermore, the system supports automatic testing and test report preparation. Consequently, it is suitable for power utilities, electrical contractors, substation maintenance teams and transformer testing professionals.

The STS 4000 is a multifunction substation test system designed for electrical equipment testing and commissioning. It combines several test functions to check the performance of transformers and other substation equipment. Moreover, it supports CT ratio, polarity, excitation curve and winding resistance tests.
In addition, the system supports VT and PT testing, transformer ratio measurement and vector group testing. It also provides primary current injection up to 800 A. However, optional booster modules can extend the current output. The system offers variable AC output frequencies from 15 Hz to 500 Hz. Furthermore, an optional TD 5000 module supports Tan Delta testing up to 12 kV. Therefore, the STS 4000 provides a combined solution for substation testing, commissioning and maintenance.
Datasheet for Multifunction substation test set STS 4000
The Doble STS 4000 Multifunction Substation Test Set is an electrical testing instrument for primary substation equipment. It combines signal generation and measurement functions to support different diagnostic tests. Moreover, it provides testing functions for current transformers, voltage transformers and power transformers.
For CT testing, the system measures transformation ratio, polarity, excitation characteristics, knee-point voltage and winding resistance. Similarly, it supports VT and PT ratio and polarity testing. In addition, engineers can perform transformer vector group and winding resistance measurements. The system also supports accuracy limit factor (ALF), instrument security factor (ISF) and secondary burden assessment. Furthermore, it supports on-load tap changer (OLTC) dynamic resistance testing with the appropriate configuration. Consequently, engineers can use the STS 4000 for several substation testing requirements.
The STS 4000 uses an integrated signal generation and measurement system. It provides low AC current, low DC current, high AC voltage and low AC voltage outputs. Moreover, its variable AC frequency ranges from 15 Hz to 500 Hz. Therefore, users can select suitable output settings for different electrical tests.
In addition, the system supports high AC voltage testing up to 2,000 V. An optional TD 5000 module extends its capabilities to Tan Delta testing up to 12 kV. Furthermore, the PADS (Power Apparatus Diagnostic Software) supports automatic test procedures and report preparation. USB and Ethernet connections also allow data transfer and PC communication. As a result, engineers can manage test results and prepare reports more easily. Thus, the STS 4000 supports substation inspection, equipment testing and maintenance planning.
Adiradh Energy offers Multifunction substation test set STS 4000 in India; Hyderabad; Visakhapatnam; Vijayawada; Chennai; Puducherry; Trichy; Coimbatore; Hosur; Bangalore; Hubli; Mysore; Cochin; Kolkata; Pune; Goa; Mumbai; Thane; Kanpur; Jaipur; Nagpur; Delhi; Noida; Gurugam; Bhopal; Vadodara; Ahmedabad; Chandigarh; Chandigarh; Tata Nagar; Raipur; Rudrapur; Durgapur; Kharagpur; Raigarh; Bhilai; Angul; Haldia; Jabalpur; Indore; Jamshedpur; Rajahmundry; Bokaro Steel City; Salem; Kochi; Rourkela; Ahmedabad ;Jamnagar; Bharuch; Sri City; Nashik; Haridwar; Mathura; Aurangabad; Bhubaneswar and other cities
![]()
2025 - Industry. All Rights Reserved.