GE 760-P1-S1-HI-A5-G-T feeder management relay

GE  760-P1-S1-HI-A5-G-T  feeder management relay

Working Principle Analysis of 760-P1-S1-HI-A5-G-T

The 760-P1-S1-HI-A5-G-T belongs to the GE Multilin 750/760 series feeder management relays. The core working principle of this intelligent protection relay is based on microprocessor technology and digital signal processing. It realizes the protection, control, and monitoring of electrical equipment by real-time monitoring of power system parameters and comparison with preset logic.

Core Working Process1. Signal Acquisition and Conditioning

• Current/Voltage Input: Acquires current (such as 5A phase current, zero-sequence current) and voltage signals in the power system through current transformers (CT) and voltage transformers (VT).

• Signal Conversion: Converts analog signals into digital signals for easy processing by the microprocessor.

• Filtering: Eliminates noise interference to ensure signal accuracy.

2. Data Processing and Analysis

• Parameter Calculation: Real-time calculation of electrical parameters such as voltage, current, frequency, power factor, and phase angle.

• Fault Detection: Identifies abnormal states such as overcurrent, overvoltage, undervoltage, frequency deviation, and phase unbalance based on algorithms.

• Logic Judgment: Compares real-time data with preset protection thresholds (such as overcurrent multiples, action time) to trigger corresponding protection logic.

3. Protection Action Execution

• Tripping Output: When a fault is detected, the relay triggers the circuit breaker to trip through output relays (such as 6 programmable outputs) to cut off the faulty circuit.

• Automatic Control: Supports functions such as automatic reclosing and backup power switching (such as automatic bus transfer) to improve power supply reliability.

4. Communication and Monitoring

• Data Transmission: Uploads data to SCADA systems or host computers via interfaces such as RS485 and Ethernet (supporting Modbus, DNP3.0 protocols).

• Remote Control: Receives remote commands to modify parameters, configure functions, or perform manual operations.

5. Human-Machine Interaction

• Display Interface: Displays real-time data, alarm information, and setting menus through an LCD screen.

• Button Operation: Supports local parameter setting, constant value adjustment, and fault record query.

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Technical Features and AdvantagesHigh-Precision Measurement

• Adopts digital signal processing technology with a measurement accuracy of up to 0.2%, ensuring the accuracy of protection actions.

Flexible Configuration

• Supports custom configuration of multiple protection functions (such as overcurrent curve selection, time limit setting) to adapt to different application scenarios.

Fault Recording and Analysis

• Stores fault waveforms and sequence of events (SOE) with a resolution of up to 1ms, facilitating post-fault analysis.

Self-Diagnosis Function

• Real-time monitoring of the relay's internal status, such as power failure and CPU anomalies, to improve reliability.

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Typical Application ScenariosDistribution System Protection

• Protects feeders, transformers, motors, and other equipment against overloads, short circuits, and other faults.

Distributed Energy Access

• Monitors the grid-connected parameters of distributed power sources such as photovoltaics and wind power to ensure power quality.

Industrial Automation Control

• Integrates with PLC and DCS systems to achieve automated control and interlock protection of power systems.

Backup Power Management

• Achieves seamless switching between primary and backup power sources through synchronization checking functions.

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Summary