Voltage protection relay PCS-985TE

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Product Overview
PCS-985TE is a numerical transformer protection relay that integrates primary and backup transformer protection functions in a single device. It provides comprehensive protection applicable to transformers at any voltage level and is typically used for startup/standby units, auxiliary transformers in multi-branch power plants and main transformers.

General Capabilities
The device supports up to 36 analog input channels for current and voltage measurements. Built-in functions include fault diagnostics, disturbance and event recording, fault recorder and a range of communication interfaces for integration with substation systems.

Key Features

• Fault detector (FR)
• Voltage and current drift auto adjustment
• VT circuit supervision (VTS)
• CT circuit supervision (CTS)
• CT saturation detection
• Self diagnostic
• GPS clock synchronization
• Fault recorder
• IEC61850 MMS & GOOSE for station bus
• IEC60870-5-103 protocol
• MODBUS protocol
• DNP 3.0 protocol

Protection Functions

• Current differential protection (87T)
• Transformer restricted earth fault protection (64REF)
• Overexcitation protection (24)
• Negative-sequence overcurrent protection (50/51Q)
• Phase overcurrent protection (50/51P)
• Phase overcurrent alarm elements (51PAlm)
• Ground overcurrent protection (50/51G)
• Phase overvoltage protection (59P)
• Phase undervoltage protection (27P)
• Residual overvoltage protection (59G)
• Overfrequency protection (81O)
• Underfrequency protection (81U)
• Rate-of-frequency-change protection (81R)
• Thermal overload protection (49)
• Impedance protection (21)
• Breaker failure protection (50BF)
• Pole disagreement protection (62PD)
• Breaker flashover protection (50F)
• Current differential protection of generator-transformer unit (87GT)
• Mechanical protection (MR)

Technical Specifications

• Model: PCS-985TE
• Type: Numerical transformer protection relay integrating primary and backup protection
• Analog inputs: Up to 36 channels (current and voltage inputs)
• Applicable voltage level: Suitable for transformer protection at any voltage level
• Typical applications: Startup/standby transformers, auxiliary transformers in multi-branch power plants, main transformers
• Ancillary functions: Fault diagnostic, disturbance recording, event recording, fault recorder
• Monitoring & supervision: VT circuit supervision (VTS), CT circuit supervision (CTS), CT saturation detection
• Time synchronization: GPS clock synchronization
• Supported communication protocols: IEC61850 MMS & GOOSE, IEC60870-5-103, MODBUS, DNP 3.0
• Built-in protections: Differential, restricted earth fault, overexcitation, negative-sequence, phase & ground overcurrent, over/under voltage, frequency protections, thermal overload, impedance, breaker-related protections, mechanical protection