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General| Type | Differential Protection Relay |
|---|---|
| Rated Frequency | 50/60 Hz |
| Model | 87B |
| Standard | IEC 60255 |
| Operating Time | 20 ms |
| Communication Interfaces | IEC 61850 |
| Protection Functions | Differential protection, Overcurrent |
| Operating Temperature Range | -25°C to +55°C |
| Mounting | Panel mounting, DIN rail mounting |
Identifies the specific model of the high impedance differential relay.
Specifies the catalog series for product identification and ordering.
Essential safety guidelines and warnings for handling and applying the relay.
Guidelines for proper receipt, care, and storage of the relay.
Detailed steps and considerations for installing the relay.
Information on wiring and interconnecting the relay.
How to configure voltage pickup and test/reset functions.
Details on fine-tuning settings using the vernier trimmer.
Procedures for verifying wiring, power, and basic operation after installation.
Details on the relay's input impedance and sensitivity characteristics.
Specifies the acceptable tolerance for voltage pickup settings.
Information on the relay's total trip time and component timings.
Ratings for continuous and short-term voltage withstand.
Permissible operating frequencies for the relay.
How the relay limits input voltage during faults.
Specifies the input-to-output isolation rating.
Available control power voltages and their catalog numbers.
Guidance on setting voltage pickup above external fault voltages.
Information on the relay's thermal withstand and energy limits during internal faults.
How to determine minimum fault current for tripping based on relay burden and CTs.
Guidelines for selecting and wiring current transformers for optimal performance.
Guidance on maintenance, parts, and component replacement.
Warnings and procedures regarding high voltage insulation tests.
Factory tests and on-site checks to verify relay functionality.
Procedure for a basic operational test using the front panel button.
Detailed procedures for bench testing and calibrating the relay.
Information on obsoleted 419B series units and their replacements.
Details on obsolete 219B series units and replacement with 419B series.
Diagram for ground fault protection of transformer/generator windings.
