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GWZC-9871 Bus Tie Protection & Control Relay

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GWZC-9871 Bus Tie Protection & Control Relay

Applicable Scope：GWZC-9871 Bus Tie Protection and Control Device is designed for bus charging protection, bus tie protection, and monitoring/control functions in power systems up to 110kV. Featuring advanced protection algorithms, it supports communication protocols including IEC 61850 and Modbus, and is suitable for both conventional and digital substations.

Product functions（ANSI）：51V | 50N/51N | 27/59 | IEC 61850: XCBR.Alm

Communication functions:Supported Protocols:IEC 60870-5-103 (over Ethernet) | MODBUS RTU (via RS-485) | IEC 61850 (Ed.2 or Ed.1, as applicable)
Interfaces:2× Ethernet Ports (IEEE 802.3 compliant, 10/100 Mbps) | | 2× RS-485 Ports (ANSI/TIA-485-A standard, galvanically isolated)

Other functions: Support time synchronization via communication message, SNTP (Simple Network Time Protocol) time synchronization, and IRIG-B time synchronization. Support the dot matrix printing function with serial port communication. Support the fault recording function

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Product Introduction Technical Parameter Size

Applicable Scope：

The GWZC-9871 Bus Tie Protection and Control Relay is a comprehensive solution designed for bus charging protection, bus tie protection, and integrated monitoring and control functions in power systems with voltage levels up to 110kV. Suitable for both conventional and digital substation configurations, this relay features advanced protection algorithms specifically optimized for bus tie applications, along with real-time measurement capabilities and support for standard communication protocols including IEC 61850 and Modbus.

Product functions（ANSI）：

1.Short-time Overcurrent Protection with Voltage Restraint (ANSI 51V)
2.Long-time Overcurrent Protection with Optional Voltage Restraint (ANSI 51V)
3.Short-time Zero-sequence Overcurrent Protection (ANSI 50N/51N)
4.Long-time Zero-sequence Overcurrent Protection (Stage I, Stage II) (ANSI 51N)
5.Voltage Protection (Overvoltage, Undervoltage) (ANSI 27/59)
6.Control Circuit Failure Alarm (IEC 61850: XCBR.Alm)
7.Potential Transformer (PT) Failure Alarm (IEC 61850: MMXU.Alm)

Electrical Specifications

Power Supply:

● AC: 85-264V, 47-63Hz (≤15% THD)
● DC: 100-370V (≤5% ripple)

Rated AC Parameters:

● Voltage: 100V/√3 or 100V
● Current: 5A/1A
● Frequency: 50Hz

Overload Capacity:

● Current Circuit: 2×In continuous | 10×In (10s) | 40×In (1s)
● Voltage Circuit: 1.5×Un continuous

Power Consumption:

● Supply: <10W (static), ≤15W (trip)
● Current Circuit: ≤1VA/phase (5A) / ≤0.5VA/phase (1A)
● Voltage Circuit: ≤0.5VA/phase

Digital Output:

● Dry contact (8A@250VAC / 30VDC)
● Dielectric: 4kVAC (coil-contact), 1kVAC (open contact)
● Operating Time: 5ms (typ) / 8ms (max)
● Mechanical Life: 100k operations

Protection Performance

Operating Range:

● Voltage: 0.5-120V (phase)
● Current: 0.02-20×In
● Zero-Seq Current: 0.05-20A
● Frequency: 35-65Hz | Delay: 0-100s

Accuracy:

● Voltage/Current: ±2.5% or ±0.1V/±0.05A (whichever greater)
● Frequency: ±0.01Hz
● Settings: ±2.5%

Trip Time:

● Instantaneous: ≤35ms (≥1.2× setting)
● Time-Delayed: ≤1% of setting or 35ms

Measurement & Monitoring

Range:

● Voltage: 0.5-120V | Current: 0.02-1.2×In

Accuracy:

● V/I: ±0.2% | Frequency: ±0.01Hz | Other: 0.5%
● Time Sync: ≤2ms | SOE: ≤1ms