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General| Current Rating | 1 A or 5 A |
|---|---|
| Frequency | 50/60 Hz |
| Protection Functions | Overload, short-circuit, earth fault |
| Communication | Modbus RTU |
| Display | LCD |
| Standards | IEC 60255 |
| Operating Temperature | -25°C to +70°C |
Covers three-phase biased differential protection, vector group matching, and CT ratio correction.
Includes stabilized operation, blocking, and high-set instantaneous stages.
Features local display, self-supervision, and input/output aspects.
Use for transformer protection and unidirectional power flow.
Compares phase currents to detect faults.
Illustrates operation across different bias current ranges.
Details operating ranges and setting parameters (p, s).
Utilizes second harmonic to prevent false trips during inrush.
Provides an additional, fast tripping stage.
Visual representation of the relay's internal modules and connections.
Lists terminal assignments for currents, voltage, and signals.
Details connection to the fibre-optic SPA data bus.
Signals exchanged between relay modules.
List of abbreviations used in diagrams.
Describes the role and connections of the output relay module.
Details the power supply's function and output voltage levels.
Examples showing how to match various transformer vector groups.
Details electrical inputs, outputs, and contact ratings.
Specifies setting ranges for differential stages, harmonics, and operating times.
Lists part numbers for relay modules and accessories.
Defines data transmission mode and code.
Explains how frequency and auxiliary voltage are encoded.
Lists required details for placing an order.
Describes indicators, display, and controls on the front panel.
Explains setting knobs and programming switches.
Details the function of push-buttons and SG1 programming switches.
Example of calculating and verifying the SG1 switch checksum.
How measured and set values are shown on the display.
How to access and navigate the main menu.
Accessing and using submenus for less frequent data.
Steps for entering and configuring settings.
Step-by-step guide for configuring module address and data transfer rate.
Explains the data recorded in the module's registers.
How to enter trip-test mode and activate output signals.
Describes the order of selecting signals for testing.
A practical example of performing a trip test.
Explains the color coding of operation indicators.
How fault codes are displayed and managed.
Single-phase differential, ratio correction, and blocking.
Vector group matching, adjustable settings, and high-set stage.
Visualizes module logic and phase current handling.
Explains how differential current and blocking signals operate.
Details blocking behavior under different current conditions.
Describes the high-set stage and its interaction with bias current.
Glossary of signal abbreviations.
Detailed view of controls, indicators, and display.
How measured values are presented on the display.
Defines setting ranges for basic, ratio, and threshold parameters.
Procedure for matching transformer vector groups using switches.
Configuration of trip signal latching and blocking modes.
Table for matching transformers with a star-connected HV side.
Table for matching transformers with a delta-connected HV side.
Explains the data recorded in the module's registers.
Visual representation of menu paths for settings and registers.
Summary of setting ranges for differential stages and operating times.
Lists and explains event codes for relay operations and communication.
List of data codes for input, output, and settings.
Details parameters configurable via remote settings.
Codes used for transmitting event data.
Clarifies how setting values are applied.
Overview of the SPA-300 relay unit components.
Instructions for changing and handling relay modules.
Details on case construction, flush mounting, and dimensions.
Information regarding terminal blocks and wiring.
How self-testing works and fault indicators.
Procedures for identifying and fixing faults.
