Sectional Automatic Transfer | Bus Tie Automatic Transfer Protection Relay

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GWZC-9861 Bus-Tie Automatic Transfer Protection Relay

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GWZC-9861 Bus-Tie Automatic Transfer Protection Relay

Product Overview:GWZC-9861 Bus-Tie Automatic Transfer Protection Relay is suitable for automatic transfer of incoming line switches, inner bridge switches, and main transformer switches at voltage levels below 110kV. It can be installed in panel assemblies or locally within switchgear cabinets.

Product functions（ANSI）：50/51 | 51VI | 49 | 74

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：
GWZC-9821 Bus-Tie Automatic Transfer Protection Relay is suitable for automatic transfer of incoming line switches, inner bridge switches, and main transformer switches at voltage levels below 110kV. It can be installed in panel assemblies or locally within switchgear cabinets, ensuring safe and stable operation of the power system.

Product functions（ANSI）：

1.Automatic Transfer Scheme Mode 1 (Line-1 Main, Bus-Tie Closed, Line-2 Standby)
IEC 61850: ATCC (Automatic Transfer Control)
2.Automatic Transfer Scheme Mode 2 (Line-2 Main, Bus-Tie Closed, Line-1 Standby)
IEC 61850: ATCC (Automatic Transfer Control)
3.Automatic Transfer Scheme Mode 3 (Line-1 & Line-2 Split Operation, Bus-Tie Standby)
IEC 61850: ATCC (Automatic Transfer Control)
4.Automatic Transfer Scheme Mode 4 (Line-1 & Line-2 Split Operation, Bus-Tie Standby)
IEC 61850: ATCC (Automatic Transfer Control)
5.Three-Stage Overcurrent Protection | ANSI 50/51
6.Inverse Time Overcurrent Protection | ANSI 51V
7.Overload Protection | ANSI 49
8.Control Circuit Supervision | ANSI 74

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