900 Model Relay Protection Tester Usage

The Megger SVERKER 900 is a versatile relay and substation test system designed for both primary and secondary testing of protective relays, capable of three-phase current and voltage injection with intuitive HMI control.OverviewThe SVERKER 900 is engineered for testing electrical distribution substations, renewable power generation stations, and industrial applications. It supports both secondary relay testing and primary injection tests, with outputs up to 105 A AC and 900 V AC. The system features three current sources and four voltage sources, each individually adjustable for amplitude, phase angle, and frequency, while the fourth voltage source can simulate a busbar for numerical relay testing .Key FeaturesThree-phase and single-phase testing: Quickly switch between testing older electromechanical relays and modern microprocessor-based relays .Frequency range: 10 Hz to 600 Hz AC, with DC testing capability .User interface: Intuitive LCD touch-screen HMI allows manual or semi-automatic testing without an external computer .Data management: Test results can be saved and exported via USB in .CSV format for analysis and reporting .Safety and flexibility: Floating, ungrounded neutral for primary switchgear testing; overload and short-circuit protection included .Typical UsageSecondary Relay Testing:Connect the relay to the SVERKER 900 terminals.Set the desired current and voltage levels, phase angles, and frequency.Perform tests such as overcurrent, directional, and recloser relay functions.Use the HMI to run predefined test plans or create custom sequences .Primary Injection Testing:Connect current and voltage sources in series or parallel to achieve higher output.Inject currents up to 105 A AC to verify trip settings and operate times of protective relays .Self-Powered Relay Testing:Use the “pre-fault and fault” mode to simulate operating conditions.Adjust pre-fault currents to ensure the relay is ready before fault injection .Numerical Relay Testing:Utilize the fourth voltage source to provide a reference voltage simulating a busbar.Test modern relays requiring precise phase and amplitude control .Practical TipsRecloser and directional overcurrent relays can be tested without complex calculations for polarization voltage or residual currents .Test plans can be saved and reused to speed up repetitive testing.Harmonics can be added to current signals to verify relay performance under non-ideal conditions .Ensure proper connection of CTs and VTs for accurate measurement and safety.Data AnalysisExport test results via USB to a computer.Analyze using Microsoft Excel or other software to generate reports and verify compliance with standards . The SVERKER 900 is a comprehensive, reliable, and user-friendly tool for engineers performing relay protection testing, offering flexibility for both field and laboratory applications while supporting a wide range of relay types and test scenarios .