ABB SPAD346C is an integrated differential relay, mainly used to protect transformers and generators from damage caused by winding short circuits, inter-turn faults, grounding faults, etc. Here is a detailed introduction of it:
I. Product Features
Multi-functional Integration: Integrated with three-phase differential relay, overcurrent relay, and grounding fault relay, providing comprehensive protection for transformers and generators.
High Sensitivity and Selectivity: The stable three-phase differential relay offers protection for winding short circuits and inter-winding faults in dual-winding transformers and generator-transformer units. According to the required principle, it provides grounding fault protection for the high-voltage and low-voltage windings of the transformer, including stable differential current principle, high impedance principle, calculated or measured residual current principle, or neutral point current principle.
Fast Response and Stability: The operating characteristics of the differential relay can easily adapt to different application scenarios, with a short running time and stable operation even when the current transformer is partially saturated.
Prevention of Malfunction: Locking based on the ratio of the second harmonic and fundamental component of the differential current prevents unnecessary actions in the protection area outside the fault and transformer surge current. At the same time, locking based on the ratio of the fifth harmonic and fundamental component of the differential current prevents actions in harmless cases of transformer overexcitation. If the ratio of the fifth harmonic and fundamental component increases during high overvoltage, this locking state can be eliminated.
Easy Installation and Debugging: Dual-winding transformer protection does not require transformers, and the digital vector groups of the high-voltage and low-voltage sides match. The CT ratio correction range is wide, and precise correction can be achieved through digital settings. At the same time, sensitive phase current and phase angle display is provided for easy inspection and measurement circuits.
Strong Communication and Expansion Capability: With four trip and four signal relay outputs, five programmable external control inputs for displaying and forwarding alarm and trip signals from gas relays, oil temperature sensors, and other transformer auxiliary equipment sensors. Adjustable CBFP running time to improve operational reliability. Integrated interference recorder can record current and digital signals, and trigger signals can be selected.
Application Scenarios
Power Industry: Used for protecting dual-winding transformers and generator-transformer units to ensure the stable operation of the power system.
Industrial Field: Applicable to various industrial scenarios requiring high-precision protection and control, such as power distribution systems in industries like steel, petrochemical, and papermaking.
Technical Specifications
Rated Current: The rated current of the relays is 1A and 5A respectively. The same or different rated currents can be used for the high-voltage and low-voltage sides.
Anti-interference Capacity: Strong anti-electrical and electromagnetic interference, capable of continuous monitoring of hardware and software.
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