Transformer Non-Electrical Protection Relay | Manufacturers, Price & Technical Specs

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GWZC-9828 Transformer Non-Electrical Protection Relay

Transformer Non-Electrical Protection Relay Side View

Transformer Non-Electrical Protection Relay Rear View

GWZC-9693 Transformer Non-Electrical Protection Relay

Applicable Scope ：The Transformer Non-Electrical Protection Relay monitors oil temperature, gas accumulation, pressure, and liquid levels in oil-immersed transformers (35kV+). Installed in control cabinets or directly on transformers (e.g., Buchholz relay), it provides alarms/trips to prevent insulation breakdown or overheating. Complementing electrical protection, it ensures reliability in substations, power plants, and industrial applications.

Product functions（ANSI）：71G | 26/49 | 63 | 38

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 Transformer Non-Electrical Protection Relay is designed to safeguard oil-immersed power transformers (35kV and above) by monitoring critical mechanical and thermal parameters such as gas accumulation (Buchholz protection), oil temperature, sudden pressure changes, and liquid levels. Typically installed either in control cabinets or directly on the transformer body (e.g., Buchholz relay on piping), it provides essential alarms and trip signals to prevent catastrophic failures caused by insulation breakdown, overheating, or internal faults.

This Transformer Non-Electrical Protection Relay complements electrical relays (e.g., differential, overcurrent) to form a complete transformer protection scheme, making it indispensable in grid substations, power plants, and industrial applications where transformer reliability is critical.

Product functionsANSI）：

1.Light Gas Protection (ANSI 71G)
2.Heavy Gas Protection (ANSI 71G)
3.High Oil Temperature Protection (ANSI 26/49)
4.Pressure Relief Protection (ANSI 63)
5.Cooler Failure Protection (ANSI 38)

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