Grounding transformers are essential components in electrical installations, particularly in power generation systems such as solar, wind, or traditional generators. They play a critical role in maintaining system reliability and safety by providing "effective" grounding, as defined in Article 100 of the NEC Code, in three-phase three-wire systems.
In photovoltaic (PV) and other distributed energy systems, traditional inverters often lack a solid neutral connection, leading to voltage imbalances and ineffective grounding. HPS addresses these challenges with custom magnetic grounding devices, typically configured as zig-zag or autotransformers. HPS Grounding Transformers ensure a stable, low-impedance path to ground, stabilizing the system under fault conditions and supporting safe and reliable operation.
Why use a Grounding Transformer?
Grounding transformers are essential in distributed energy resources systems like solar systems, battery energy storage systems, and generators. HPS grounding transformers provide reliable and effective solutions to the challenges of ungrounded Delta or Wye generation systems, enhancing safety, reliability, and operational stability.
Key Benefits
Protect Sensitive Equipment
Prevent overvoltage and stabilize the neutral point to safeguard critical components during faults.
Improve System Durability
Limit transients and overvoltage disturbances while providing a reliable path for fault currents.
Minimize Disruptions
Withstand faults until breakers trip or inverters detect issues, ensuring continuous system operation.
Operate with Confidence
Establish a stable neutral and support single-phase loads for seamless, balanced, and safe energy use.
Types of Grounding Transformers
Zig-Zag Transformers
- Compact and cost-effective
- Autotransformer with copper bi-filar windings
- Reduces triplen harmonics
Wye-Delta Transformers
- Wye-neutral with a floating delta for zero-sequence loads
- Familiar design that can also supply auxiliary loads when necessary
- Primary Voltage: Three-phase, ranging from 208V to 34.5kV.
- Secondary Voltage: Applicable only to Wye-Delta transformers, with a standard voltage of 480V.
- Windings: Copper and aluminum windings available
- Continuous Neutral/kVA Rating: Available from 1 kVA to 7500 kVA, with custom options available upon request.
- Temperature Rise: Standard 150oC temperature rise
- Insulation Class: 220oC insulation class
- Enclosure Type: Ventilated Type 3R enclosure, with other options available based on specific requirements.
- System Frequency: Standard frequency of 60 Hz, with options for 50 Hz and other frequencies as required.
- BIL: BIL per specification and voltage
- Certifications: UL Listed and CSA Certified.
- Options: Optional infrared windows available
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