Product Introduction :
The GWZC-9827 Transformer Backup Protection Relay is a versatile protection device designed for 66kV, 33kV, and 11kV power transformers in substations, industrial plants, and renewable energy systems. It provides overcurrent, earth fault, overload, and negative sequence protection, along with optional breaker failure and harmonic blocking features to enhance reliability.
The GWZC-9827 Transformer Backup Protection Relay Typically installed in switchgear or protection panels near transformers, it serves as a critical secondary protection relay, ensuring backup security in case primary protection fails. With support for IEC 61850 and Modbus, it integrates seamlessly into modern power systems, safeguarding transformers against faults and improving grid stability.
Product functionsANSI）：
1.Three-Stage Phase Overcurrent Protection (ANSI 50/51)
2.Inverse Time Phase Overcurrent Protection (ANSI 51)
3.Three-Stage Zero-Sequence Overcurrent Protection (ANSI 50N/51N)
4.Inverse Time Zero-Sequence Overcurrent Protection (ANSI 51N)
5.Overload Protection (ANSI 49)
6.Gap Zero-Sequence Overcurrent Protection (ANSI 50G/51G)
7.Cooling System Start & Tap Changer Block (ANSI 38/74)
8.Overvoltage Protection (ANSI 59)
9.Zero-Sequence Overvoltage Protection (ANSI 59N)
10.Undervoltage Protection (ANSI 27)
11.Control Circuit Open Alarm (ANSI 74)
12.PT Open-Circuit Alarm (ANSI 60)
13.Phase Overcurrent Protection under PT Open-Circuit (ANSI 50/51)
14.PT Loss of Voltage Alarm (ANSI 27/81U)
15.System Power Loss (ANSI 27/81L)
16.Non-Electrical Protection (ANSI 30)
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
Event Recording:
● 128 protection trips/operations
● 32 self-tests/fault waveforms (COMTRADE)
Environmental & Mechanical
Operating Temp:
● Standard: -10°C to +55°C
● Extended: -40°C to +70°C*
Storage Temp: -40°C to +80°C
Humidity: 5-90% RH (non-condensing)
Pressure: 60-110 kPa
Compliance:
● IEC 60255-21 (vibration/shock)
● IEC 61000-6 (EMC)
