Main Transformer On-Load Tap Changer Control Relay

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GWZC-9829 Main Transformer On-load Tap Changer Control Relay

Main Transformer On-load Tap Changer Control Relay Side View

Main Transformer On-load Tap Changer Control Relay Rear View

GWZC-9829 Main Transformer On-load Tap Changer Control Relay

Applicable Scope ：The GWZC-9829 OLTC Control Relay monitors tap positions and controls voltage regulation in 66kV/110kV power transformers. Installed in tap-changer control cabinets, it enables automatic/manual adjustments with SCADA integration for grid stability.

Product functions（ANSI）：94 | 90

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

Product Introduction :

The GWZC-9829 Main Transformer On-load Tap Changer Control Relay is designed for transformer tap position measurement and step voltage regulation in power substations. This specialized relay is typically installed in the control cabinet of power transformers’ on-load tap changers, where it performs core functions including: real-time tap position monitoring, automatic/manual tap change control, and interface with SCADA systems.

GWZC-9829 Main Transformer On-load Tap Changer Control Relay is primarily applied in 66kV/110kV main power transformer regulation systems to maintain stable voltage levels across the grid. The relay supports both local HMI operation and remote control from dispatch centers, with protective interlocks to prevent maloperation during abnormal grid conditions.

Product functionsANSI）：

1.Tap Position Measurement (ANSI 94)
2.Local/Remote Tap Change Control (ANSI 90)

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