Description
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Netze BW is seeking requests for participation for high-quality combined current and voltage transformers for our 123 kV applications. Companies with the capability to meet our technical specifications are invited to submit their requests for participation. This qualification system contains critical electrical data and implementation guidelines to ensure performance, safety, and compatibility with our existing infrastructure. Below are the summarized technical requirements and guidelines: **Electrical Specifications:** - **Highest Voltage Um:** 123 kV - **Rated Power-Frequency Withstand Voltage:** 230 kV - **Rated Lightning Impulse Withstand Voltage:** 550 kV - **Rated Frequency:** 50 Hz - **Rated Voltage Factor:** 1.9 Un for 8 hours - **Rated Short-Time Thermal Current Ith:** 40 kA (effective) - **Rated Dynamic Current Idyn:** 100 kA (peak value) - **Earthquake Resistance:** Zone 4, Horizontal Accelerations of 0.1 g - **Stationary Test Forces:** Static load - 3,000 N, Dynamic load - 5,000 N - **Gas Filling:** Synthetic air (N2 + O2) or an approved alternative insulating gas with a GWP of less than 1. **Design and Construction Requirements:** - **Low-Tilt Design:** Transformers must minimize relaxation oscillations and transient oscillations. Proof of performance can be requested. - **Composite Insulators:** Required for gas-filled transformers, GRP pipes with epoxy resin impregnation, and silicone shielding that forms an inseparable bond. Prefabricated screens must not be bonded; silicone screens should be cast onto the GRP pipe. **Implementation Guidelines:** **Type 1:** Combined Current and Voltage Transformers for Outdoor Installations (Line, Coupling, and Feeder Field) 1. **Current Transformer:** - Core 1 & Core 2: Metering, Ratio 4x300 / 1 A, 10 VA, Class 0.1, FS 10, Overcurrent factor: Ext. 200% - Core 3: Measuring, Ratio 4x300 / 1 A, 5 VA, Class 0.5, FS 10, Overcurrent factor: Ext. 240% - Core 4 & Core 5: Protection, Ratio 4x600 / 1 A, 5 W, TPZ, KSSC = 34, TP = 50 ms 2. **Voltage Transformer:** - Ratio: 110.000√3 V / 1003-√ V / 1003-√ V / 100√3 V - Windings: - Winding 1 & 2: Metering, 15 VA, Class 0.1 - Winding 3: Measuring and Protection, 25 VA, Class 0.5 **Type 2:** Combined Current and Voltage Transformers for Outdoor Installations (110/MS Transformer Feeder Field) 1. **Current Transformer:** - Core 1 & Core 2: Metering, Ratio 4x150 / 1 A, 10 VA, Class 0.1, FS 10, Overcurrent factor: Ext. 200% - Core 3: Measuring, Ratio 4x150 / 1 A, 5 VA, Class 0.5, FS 10, Overcurrent factor: Ext. 240% - Core 4 & Core 5: Protection, Ratio 4x300 / 1 A, 5 W, TPZ, KSSC = 17, TP = 50 ms 2. **Voltage Transformer:** - Ratio: 110.000√3 V / 1003-√ V / 1003-√ V / 100√3 V - Windings: - Winding 1 & 2: Metering, 15 VA, Class 0.1 - Winding 3: Measuring and Protection, 25 VA, Class 0.5 **Type 3:** Combined Current and Voltage Transformers for Outdoor Installations (Line, Coupling, and Feeder Field) 1. **Current Transformer:** - Core 1: Measuring, Ratio 4x300 / 1 A, 5 VA, Class 0.5, FS 10, Overcurrent factor: Ext. 240% - Core 2: Protection, Ratio 4x600 / 1 A, 5 W, TPZ, KSSC = 34, TP = 50 ms 2. **Voltage Transformer:** - Ratio: 110.000√3 V / 1003-√ V - Windings: - Winding 1: Measuring and Protection, 25 VA, Class 0.5 **Important Keywords:** 123 kV Transformers, Combined Current and Voltage Transformers, High Voltage Transformers, Outdoor Installation Transformers, Earthquake Resistant Transformers, Synthetic Air Insulated Transformers, Low-Tilt Design Transformers, Composite Insulators Transformers, Netze BW RFP. We look forward to receiving your request for participation and potential partnerships.