Generator-Transformer Differential Protection Relay Product Introduction:
The GWZC-9887 Generator-Transformer Differential Protection Relay is designed for differential protection of small to medium-sized generator-transformer units with capacities up to 10MW. It provides high-speed fault detection, selective tripping, and secure operation for generator and transformer windings. Suitable for hydropower plants, industrial power systems, and distributed generation facilities, this relay can be panel-mounted in centralized protection panels or deployed in decentralized switchgear cabinets near the protected equipment. Its compact design ensures reliable performance in diverse installation environments while maintaining compliance with industry protection standards.
Generator-Transformer Differential Protection Relay Product functions（ANSI）：
1.Instantaneous Differential Protection (ANSI 87H)
2.Percentage Differential Protection (ANSI 87)
3.Differential Current Alarm (ANSI 87A)
4.CT Open-Circuit Detection (ANSI 87B)
5.Main Tank Buchholz Alarm (ANSI 71M)
6.Main Tank Buchholz Trip (ANSI 71M)
7.OLTC Buchholz Alarm (ANSI 71T)
8.OLTC Buchholz Trip (ANSI 71T)
9.Temperature Rise Alarm (ANSI 38)
10.Overtemperature Trip (ANSI 49)
11.High Oil Level Alarm (ANSI 71O)
12.Low Oil Level Alarm (ANSI 71O)
13.Pressure Relief Device (ANSI 63PR)
14.Thermal/Hydraulic Fault (ANSI 27/81U)
15.Excitation System Fault (ANSI 40)
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)
