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Help Center33KV/11KV/110V Metering Unit for Gas Insulated Substations With Mill Test Report
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As a specialized manufacturer in high-voltage electrical equipment, Jinhua Dika Electrical Equipment is proud to present our precision-engineered 33kV/11kV/110V Metering Unit designed for integration into modern Gas Insulated Substations (GIS). We understand the critical role of accurate energy measurement and system protection in utility and industrial power networks. This metering unit is meticulously crafted to deliver reliable performance, exceptional accuracy, and seamless compatibility within the compact, maintenance-friendly environment of GIS installations. Our commitment to quality manufacturing and comprehensive documentation, including a detailed Mill Test Report, ensures you receive a product that meets stringent technical specifications and provides long-term operational confidence.
This metering unit is a core component for revenue metering, protection relaying, and system monitoring within high-voltage substations. It typically combines Voltage Transformers (VTs) and Current Transformers (CTs) in a single, gas-insulated enclosure, aligning with the space-saving and safety advantages of GIS technology. The unit steps down the primary system voltages (33kV or 11kV) to standardized secondary voltages (110V) suitable for connection to meters, relays, and SCADA systems.
Key Features & Technical Advantages:
- Integrated GIS Design: Specifically engineered for direct installation within SF6 gas-insulated switchgear compartments, ensuring perfect mechanical and electrical compatibility.
- High Measurement Accuracy: Manufactured to achieve high accuracy classes (e.g., 0.2 or 0.5) for precise energy measurement, crucial for billing and load analysis.
- Robust Gas Insulation: Utilizes the excellent dielectric properties of SF6 gas, providing superior insulation in a compact footprint compared to air-insulated units, and enhancing safety by containing arcs.
- Reliable & Stable Output: Delivers stable and accurate 110V secondary signals, ensuring dependable operation of connected metering and protection devices.
- Compact & Space-Saving: The integrated unit design significantly reduces the overall footprint required for metering bays within a substation.
- Low Maintenance: Sealed within the GIS environment, protected from dust, moisture, and pollution, leading to reduced maintenance needs and higher reliability.
- Enhanced Safety: Live parts are fully enclosed in grounded metal housing filled with insulating gas, minimizing risks of electrical shock and fire.
Technical Specifications Overview:
The table below outlines typical specifications. Exact parameters can be customized based on project requirements.
| Parameter | Specification / Option |
| Primary Rated Voltage (Ur) | 33 kV / 11 kV |
| Secondary Rated Voltage | 110 V / (√3) 63.5 V |
| Rated Frequency | 50 Hz or 60 Hz |
| Accuracy Class for Metering | 0.2, 0.5, 1.0 (Selectable) |
| Rated Insulation Level | As per IEC 62271-1 / IEEE C37.122 |
| Insulating Medium | SF6 Gas |
| Rated Gas Pressure | Customizable (e.g., 0.4 MPa abs) |
| Connection Type | Plug-in or Fixed, per GIS design |
| Ambient Temperature | -25°C to +40°C (Operational) |
Benefits for Your Project:
- Project Confidence: The inclusion of a Mill Test Report provides verifiable data on materials, manufacturing processes, and factory tests, ensuring compliance with your specifications.
- Simplified Procurement: Get a pre-assembled, tested unit that simplifies system design, installation, and commissioning for your GIS project.
- Long-Term Cost Efficiency: High accuracy minimizes revenue loss due to measurement errors, while low maintenance design reduces lifecycle costs.
- System Compatibility: Designed to interface seamlessly with other GIS components and standard protection/metering panels.
- Global Application: Suitable for power utility networks, industrial plants, data centers, and commercial complexes worldwide.
Jinhua Dika Electrical Equipment operates with a firm commitment to quality, evidenced by our adherence to recognized management standards. Our products reach diverse global markets, from North America and Europe to Southeast Asia and Africa, supported by efficient logistics from major Chinese ports. With over a decade of experience and a dedicated team, we focus on delivering reliable high-voltage solutions. This 33kV/11kV/110V GIS Metering Unit exemplifies our capability to provide components that are not just products, but integral parts of a safe, efficient, and modern electrical infrastructure. Its precision engineering, coupled with full traceability via the Mill Test Report, offers you a dependable solution for critical substation metering needs. We invite you to contact us for detailed technical discussions, customized quotations, and to experience a partnership focused on quality and reliability.
Frequently Asked Questions (FAQ):
-
What exactly is included in the "Metering Unit"?
This unit typically comprises one or more Voltage Transformers (VTs) and Current Transformers (CTs) housed in a common, gas-insulated enclosure. It is a complete assembly ready for integration into a designated GIS bay, providing all necessary secondary connections for metering and protection circuits. -
Can this unit be used for both metering and protection functions?
Yes, absolutely. The transformers within the unit are designed to provide separate cores or windings with different accuracy classes. One set (e.g., 0.2 class) is dedicated to precision revenue metering, while another set (e.g., 5P or 10P class) is provided for protection relays, all within the same compact housing. -
What is the significance of the Mill Test Report (MTR)?
The MTR is a certified document from the raw material manufacturer (e.g., for the core laminations, conductor copper, insulation materials). It provides chemical and physical test results, proving the material's compliance with specified standards. For you, it ensures traceability, quality verification, and is often a mandatory requirement for utility projects. -
Is the SF6 gas handling included, and how is gas tightness ensured?
The unit is supplied sealed and filled with SF6 gas to the specified pressure. We ensure gas tightness through rigorous factory tests, including pressure decay and leak detection tests. On-site gas handling during GIS installation is typically handled by the GIS system installer, following standard procedures. -
How do I ensure this unit is compatible with my existing GIS brand?
Compatibility is crucial. We require detailed interface drawings and electrical specifications of your GIS (flange dimensions, connection types, gas compartment layout). We then design and manufacture the metering unit to be a perfect mechanical and electrical fit for your specific switchgear. -
What are the typical delivery and testing procedures?
Delivery time depends on customization. Standard procedure includes design approval, manufacturing, comprehensive routine tests (ratio, polarity, insulation resistance, dielectric tests), optional special tests, and final inspection. The MTR and all test reports are shipped with the product. -
Can you provide units for different primary voltage levels, like 36kV or 24kV?
Yes, our manufacturing capabilities allow for customization. While 33kV and 11kV are standard ratings, we can engineer units for other common medium-voltage levels such as 36kV, 24kV, or 15kV. Please provide your exact voltage requirements. -
What after-sales support do you offer?
We provide technical documentation, installation guidance drawings, and responsive support for any technical queries. For critical components, we maintain a stock of recommended spare parts. Our support aims to ensure smooth integration and operation throughout the product's service life.
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