Potential Transformer (PT) Cubicles
-- Steady & Reliable Manufacturer --
Product Overview
Potential Transformer (PT) Cubicles, also known as Voltage Transformer (VT) units, are essential for the safe measurement and monitoring of high-voltage systems. At DSJ Electrical, our PT cubicles step down system voltages (up to 40.5kV) to a standardized, low-level measurable signal (usually 100V or 110V) for protection relays and meters. These cubicles are engineered with high-precision, epoxy-resin cast transformers that offer superior insulation and accuracy. We prioritize "Safety Isolation," utilizing withdrawable "truck-mounted" PTs that can be physically disconnected from the live busbars for fuse replacement or maintenance. Equipped with specialized lightning arresters and damping resistors to prevent ferroresonance, DSJ PT cubicles provide the stable, accurate voltage reference required for the heart of any medium-voltage substation.
Electrical Partner
At DSJ, we transform complexity into reliability. With 42+ years of expertise in power distribution systems, our turnkey service integrates every phase – from regulatory compliance to final commissioning – ensuring seamless project execution for global clients. Whether it is the initial design or the final handover, we will strictly control every detail to ensure that the final delivered products perfectly meet your expectations. With us, you can focus on your core business with peace of mind, knowing that your project is in the hands of professional and reliable partners.
Introduction
The Potential Transformer (PT) Cubicle line from DSJ Electrical Co., Ltd is the "Eyes and Ears" of the medium-voltage grid. We recognize that without accurate voltage sensing, protection relays cannot function and billing becomes impossible. Our introduction of this series focuses on "Measurement Precision" and "Transient Protection." Every cubicle is designed to withstand extreme BIL (Basic Insulation Level) requirements, ensuring that external surges do not compromise the secondary monitoring circuits.
Innovation at DSJ involves our "Anti-Ferroresonance" technology. We integrate specialized hardware to eliminate the non-linear oscillations that can lead to PT failure in ungrounded systems. Our manufacturing process includes 100% partial discharge testing, ensuring that the insulation is void-free and ready for a 30-year service life. We provide clear mimic diagrams and secondary terminal blocks that are organized for easy integration into your SCADA system. At DSJ, we understand that voltage data is the foundation of grid stability; we provide the ruggedized enclosures and high-accuracy transformers needed to capture that data flawlessly, even in the most electrically noisy environments.
Applications
- Utility Substations: Main busbar voltage sensing and synchronization.
- Industrial Power Hubs: Providing signals for over/under voltage protection.
- Renewable Energy: Voltage monitoring for grid-tie inverters.
- Revenue Metering: High-accuracy voltage reference for billing meters.
- Power Quality Labs: Stable signals for harmonic and transient analysis.
- Generator Synchronization: Essential for safe paralleling of power sources.
Specifications
| Technical Aspect | PT Cubicle Spec |
|---|---|
| Rated Primary Voltage | Up to 40.5kV |
| Secondary Voltage | 100V, 110V, 115V, 120V |
| Accuracy Class | 0.2, 0.5, 3P, 6P (Revenue Grade) |
| Configuration | Withdrawable / Fixed |
| Insulation Medium | Epoxy Resin (Dry Type) |
| Burden Capacity | 30VA to 500VA (Customizable) |
| Standard | IEC 61869-3 / IEEE C57.13 |
Why Choose Us
DSJ Electrical is a specialist in "Precision Sensing." We don't just provide a panel; we provide a calibrated measurement system. Our PT cubicles are trusted by national utilities for their stability and safety features, offering a "Plug-and-Play" voltage reference that is factory-certified for accuracy.
- Q: Why are PTs often mounted on a withdrawable truck?
- A: To allow for the safe replacement of primary fuses without de-energizing the whole busbar.
- Q: What accuracy class do I need for protection?
- A: Typically, Class 3P or 6P is used for protection, while Class 0.2/0.5 is for metering.
Advantages
- High Accuracy: Precision cores ensure reliable data for billing and protection.
- Maximum Safety: Withdrawable design for safe fuse access.
- System Stability: Integrated damping avoids ferroresonance risks.
- Rugged Protection: High-quality HV fuses protect against internal faults.
- Modular Fit: Perfectly matches our KYN28 and XGN switchgear series.
- Long Life: Epoxy-cast transformers require zero maintenance.
Standards & Certifications
Our PT cubicles are compliant with IEC 61869-3 and GB 1207. We hold CE and ISO 9001 certifications. Each unit undergoes a full routine test, including polarity check, ratio error test, and power-frequency withstand test before delivery.
Payment & Shipping
PT Cubicles are shipped as fully assembled vertical panels. Transformers are securely braced for transit. We offer global shipping via sea or air with reinforced wooden crating. Lead times: 5-7 weeks.
DSJ Story
about DSJ
Building Power, Building Trust
Founded in 1983, DSJ is a leader in China's power distribution equipment. Headquartered in Beijing as the top-selling enterprise, we integrate manufacturing with trade and maintain full in-house capabilities in R&D, production, and sales. This enables efficient fulfillment of custom orders with industry-leading speed.
As a producer of distribution system, transformer, generator and photovoltaic products exceeding Chinese/international standards, DSJ supplies medium/low-voltage electrical equipment, and PV systems. For over four decades, we have delivered high-safety electrical solutions globally to public infrastructure, corporations, and households – achieving the industry's lowest return rate.
Committed to "meeting diverse needs through quality", DSJ leverages expert teams to provide one-stop services: pre-sales consultation & customization, flexible logistics/payment options, and reliable maintenance – ensuring seamless producer-maintainer-customer collaboration.
+86 18513032986 
FLC Center, Chaoyang District, Beijing, China