SIEMENS 7RE2800-0CA00 – Voltage Balance Relay | SIPROTEC Protection Platform
Engineering Background
The SIEMENS 7RE2800-0CA00 is a dedicated voltage balance relay engineered for high-reliability power system protection. Designed within Siemens’ proven SIPROTEC protection relay ecosystem, this device monitors voltage symmetry across phases and initiates protective tripping when imbalance thresholds are exceeded — safeguarding transformers, generators, motors, and distribution networks from asymmetric fault conditions.
Product Positioning
Targeted at power utilities, industrial plant engineers, and OEM panel builders who require deterministic, standards-compliant voltage protection. The 7RE2800-0CA00 is a drop-in solution for retrofit and greenfield projects where voltage unbalance monitoring is a critical protection layer.
Complete Technical Specifications
- Part Number: 7RE2800-0CA00
- Manufacturer: Siemens AG
- Function: Voltage Balance / Voltage Symmetry Protection Relay
- Platform: SIPROTEC Protection Relay Series
- Rated Voltage Input: Per application (consult datasheet for VT secondary ratings)
- Measuring Principle: Continuous 3-phase voltage monitoring with balance comparison
- Trip Output: Relay contact output (NO/NC configurable)
- Auxiliary Supply: DC/AC (refer to Siemens product datasheet for exact range)
- Mounting: DIN rail / panel mount (per SIPROTEC standard)
- Weight: 240 g
- Compliance: IEC 60255 series, CE marked
- Operating Temperature: -10°C to +55°C (storage: -25°C to +70°C)
- Protection Class: IP40 (front panel) / IP20 (terminals)
- Communication: Per SIPROTEC platform configuration
Proven Application Environments
- Power utility substations — voltage unbalance protection for HV/MV feeders
- Industrial motor protection panels — detecting single-phasing and phase loss conditions
- Generator protection schemes — monitoring excitation voltage symmetry
- Transformer differential protection systems — supplementary voltage supervision
- Renewable energy integration — wind/solar inverter output voltage monitoring
- Marine and offshore power distribution — IEC-compliant voltage protection
Engineering Advantages
- Deterministic Response: Fixed-threshold voltage balance detection with configurable time delay for coordination with upstream/downstream protection
- SIPROTEC Ecosystem Compatibility: Integrates seamlessly with Siemens SIPROTEC 4 and SIPROTEC Compact relay families for unified protection schemes
- Compact Footprint: Optimized for space-constrained relay panels without sacrificing measurement accuracy
- High Measurement Accuracy: Precision voltage sensing ensures reliable discrimination between normal asymmetry and fault conditions
- Robust Construction: Industrial-grade components rated for continuous operation in harsh electrical environments
- Standards Compliance: Fully compliant with IEC 60255 protection relay standards, accepted by major utilities and certification bodies worldwide
System Architecture & Signal Flow
The 7RE2800-0CA00 connects to the secondary terminals of voltage transformers (VTs) on the monitored bus or feeder. The relay continuously samples all three phase voltages, computes the voltage balance ratio, and compares it against the configured threshold. Upon detecting sustained imbalance beyond the setpoint and time delay, the output relay contact operates — triggering a trip signal to the associated circuit breaker or issuing an alarm to the SCADA/DCS system. The relay resets automatically when voltage balance is restored within the reset threshold.
Signal Flow: VT Secondary → Voltage Input Terminals → Balance Measurement Circuit → Threshold Comparator → Time Delay Element → Trip/Alarm Output Contact → CB Trip Coil / SCADA Input
Sourcing & Quality Verification
- Origin: Genuine Siemens AG manufactured component
- Sourcing: Procured through verified Siemens authorized distribution channels and certified industrial surplus networks
- Inspection: Each unit undergoes visual inspection, label verification, and functional pre-shipment check
- Traceability: Siemens factory serial number and date code verified prior to dispatch
- Packaging: Original or equivalent ESD-safe protective packaging
- Warranty: 12-month operational warranty against manufacturing defects
Procurement Process
- Inquiry: Submit your RFQ via Konmask.com product page or email support@konmask.com with quantity and delivery requirements
- Quotation: Receive a formal quotation with lead time, unit price, and shipping options within 1 business day
- Order Confirmation: Place order via the online store or purchase order; proforma invoice issued upon request
- Quality Check: Pre-shipment inspection completed; photos/test reports available on request
- Shipping: Dispatched via DHL / FedEx / SF Express with full tracking; export documentation (commercial invoice, packing list, COO) provided
- After-Sales: Technical support available post-delivery; returns accepted within 30 days for unused items in original condition
Technical FAQ
Q: What is the difference between voltage balance relay and voltage unbalance relay?
A: These terms are functionally equivalent. The 7RE2800-0CA00 monitors the ratio of negative-sequence to positive-sequence voltage components and trips when the imbalance exceeds the configured threshold — regardless of terminology used in your specification.
Q: Can this relay be used for single-phase applications?
A: No. The 7RE2800-0CA00 is designed for 3-phase voltage balance monitoring. For single-phase overvoltage/undervoltage protection, refer to Siemens 7RW series relays.
Q: Is the 7RE2800-0CA00 compatible with DIGSI configuration software?
A: Compatibility depends on the specific SIPROTEC platform variant. Please contact Konmask technical support with your existing SIPROTEC system details for confirmation.
Q: What is the typical lead time for this part?
A: In-stock units ship within 2–3 business days. For out-of-stock inquiries, lead time is typically 2–4 weeks depending on sourcing availability.
Q: Do you provide a Certificate of Conformity (CoC) or test report?
A: Yes. Siemens factory CoC and pre-shipment inspection reports are available upon request for orders of 1 unit or more.
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