Applications

Delta Star specializes in engineering and manufacturing of high quality transformers up to 315 kV, 300MVA in both single and three phase configurations up to 1175 BIL. Utility applications include power, distribution, generator step up, unit auxiliaries (UAT), grounding units, voltage regulators and auto transformers.

 

Scope & Capabilities

 

Type MVA (Top Rating) HV kV
Power Transformer 200 15-315
Auto Transformer 300 69-315
Voltage Regulator 7 5-69
Grounding Transformer 15-115
Generator Step-up Same Ratings as Type 1 & 2 
Unit Auxiliary 60 15-34.5
Skid Mounted Substations 100 15-230

 

Engineering Capabilities

Delta Star’s engineers use  reliable, accurate and state-of-the-art special transformer design software (TDS). TDS includes optimization package (TRDO) for all types of designs, 3D magnetic field analysis (ELMAG 3D) for calculation of the losses and temperature rise of metallic components, 2D electrostatic field analysis (2D TELAX) for optimization of windings insulation structure and WELDINST for short circuit analysis (forces and stresses) including Dynamic Mode for axial forces and displacement of each section of the windings.

Test Standards

Leveraging decades of experience, our test engineers and technicians measure performance data throughout manufacturing to verify compliance to design criteria. Testing to IEEE, ASTM, NEMA and ISO 9001:2015 technical and quality standards, all routine, design and special testing plans are laid out by design engineering.
100 %
C57.12.90 IEEE Standard Test Codes Used
?
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Contact us for more information about our test standards
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100 %
C57.12.90 IEEE Standard Test Codes Used
?
Contact Us
Contact us for more information about our test standards
Contact Us
100 %
C57.12.90 IEEE Standard Test Codes Used
?
Contact Us
Contact us for more information about our test standards
Contact Us
100 %
C57.12.90 IEEE Standard Test Codes Used
?
Contact Us
Contact us for more information about our test standards
Contact Us
100 %
C57.12.90 IEEE Standard Test Codes Used
?
Contact Us
Contact us for more information about our test standards
Contact Us
100 %
C57.12.90 IEEE Standard Test Codes Used
?
Contact Us
Contact us for more information about our test standards
Contact Us
Low Voltage Testing
Loss Measurement
Thermal Testing
Sound Level Testing
Functional Control Test
High Voltage Dielectric

Control Cabinet

In this area, the flexibility of Delta Star is most visible. Delta Star builds lightweight, durable aluminum enclosures and control cabinets. Our unmatched engineering staff designs transformer protection and relaying systems on some of the most complex transformers and mobile substations on the market. As a result, Delta Star has more experience in control cabinets than anyone in the industry.

Tank Fabrication

Every steel tank is designed and manufactured at our factories, giving us both flexibility and control over quality and lead time. Because long-term tank integrity is absolutely essential for the reliability and long life of a transformer, Delta Star fabricates transformer tanks to meet the highest standards of quality and craftsmanship. All tanks and covers are fabricated of high quality plate steel to withstand full vacuum. Tank corners are bent instead of welded to assure strength, reliability, and eliminate stress leaks. Welding is accomplished in a double shielded "mig" process that provides continuous welds. All tank seams are welded inside and outside to ensure leak free construction.

Nitrogen System

Delta Star’s decades of building mobile substations has led to a reliable nitrogen system that is considered the best in the industry. Today we utilize that time-tested design on our regular power transformers because they are superior to any other system on the market.

Tap Changing Equipment

Tap changing equipment used on Delta Star transformers are available for off-load or load applications. Both type units have been developed and improved to exceed the highest industry standards to provide long service life with minimum maintenance requirements. Off-load DETC units feature silver plated contacts and operate under spring-pressure to ensure positive contact. The tap changing control lever is operated externally. It clearly indicates the tap position and can be pad locked in the locked position. Load LTC units maintain the voltage at the load to the required level, automatically utilizing advanced technical design and the most durable high efficiency and long contact life.

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