ABB PCD231B101
The ABB PCD231B101 is a line differential protection relay within the ABB Relion® Protection Relay Series, specifically designed as the primary protection for high-voltage transmission lines and cable circuits. This relay compares the current phase and magnitude at both ends of the line via fiber optic channels to quickly detect internal faults (such as short circuits and ground faults), achieving millisecond-level tripping to ensure power grid stability and equipment safety.
Core Values of PCD231B101
High-Speed Fault Clearing: Operating time ≤ 20ms, minimizing the impact of faults on the power grid.
High-Reliability Communication: Supports multiple fiber optic channels (e.g., dedicated optical fibers, SDH/MSTP networks) to adapt to different communication infrastructures.
Adaptive Braking Characteristics: Resists CT saturation and the influence of load current to prevent maloperation.
Product Parameters
Product Model: PCD231B101
Manufacturer: ABB
Product Type: Line Differential Protection Relay
Rated Current: 1A or 5A (CT secondary side, configurable)
Differential Pickup Value: 0.1-1.0Ie (step size 0.01Ie)
Braking Coefficient: 0.1-0.8 (adjustable slope)
Operating Time: ≤ 20ms (for internal faults)
Communication Channels: Fiber optics (multimode/singlemode), Ethernet (IEC 61850-9-2 SV)
Communication Rate: 64 kbps - 100 Mbps (adaptive)
Supported Protocols: IEC 61850, Mirrored Bits®, DNP3.0
Operating Temperature Range: -25°C to +55°C (-13°F to +131°F)
Protection Class: IP40 (panel mounting)
Mounting Method: DIN Rail or panel mounting
Certification Standards: IEC 60255, IEEE C37.94, UL 508
Structure and Composition
The PCD231B101 adopts a modular design, with main components including:
Signal Acquisition Unit
High-precision CT interface, supporting 1A/5A CT input with a sampling rate ≥ 1 kHz.
DSP Processing Module
Calculates differential current and braking current in real time, and executes the proportional braking algorithm.
Communication Interface Board
Fiber optic transceiver (SFP module), supporting multimode/singlemode fiber optics (maximum distance of 80km).
Ethernet port (IEC 61850-9-2 SV for sampled value transmission).
Human-Machine Interface (HMI)
320×240 graphic LCD for local viewing of differential current and channel status.
Fault Recording Unit
Records waveforms of ≥ 128 cycles (in COMTRADE format).
Key Features and Advantages
1. High-Precision Differential Protection
Proportional braking characteristics prevent maloperation during external faults (e.g., CT saturation, capacitive current).
Capacitive current compensation function, suitable for long cable lines (>10km).
2. Flexible Communication Configuration
Supports dedicated fiber optics, SDH/MSTP, and Ethernet channels, adapting to existing communication networks.
Channel redundancy function, automatically switching to backup channels (switching time ≤ 50ms).
3. Intelligent Diagnosis and Synchronization
PTP (IEEE 1588) time synchronization, with sampling synchronization error ≤ 1μs at both ends.
Real-time monitoring of channel delay and packet loss rate, providing early warnings for communication anomalies.
4. Industrial-Grade Reliability
Wide operating temperature range of -25°C to +55°C, complying with the IEC 60068-2 environmental standard.
Built-in self-test function for real-time monitoring of hardware health status.
Typical Application Case
In a 220kV double-circuit transmission line, the PCD231B101 exchanges current data with the opposite-side relay via OPGW optical fibers. After detecting a short-circuit fault, it trips within 15ms and activates the auto-reclosing function through IEC 61850 GOOSE.
Installation and Maintenance
Installation Key Points
CT polarity must be consistent (pointing to the line direction).
The bending radius of fiber optic interfaces should not be less than 50mm to prevent excessive optical attenuation.
Maintenance Recommendations
Conduct channel testing once a year (e.g., injecting differential current to verify the operating value).
Regularly check the cleanliness of fiber optic connectors (using dedicated cleaning tools).
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