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GWZC-9790N Reverse Power Protection Relay
Reverse Power Protection Relay Side View
Reverse Power Protection Relay  Rear View
GWZC-9790N Reverse Power Protection Relay
Reverse Power Protection Relay Side View
Reverse Power Protection Relay  Rear View
GWZC-9790N Reverse Power Protection Relay (ANSI 32)

Applicable Scope :The ​GWZC-9790N Reverse Power Protection Relay​ prevents reverse power flow in electrical systems by tripping the circuit upon detection. Used in ​6.6kV-33kV systems, it safeguards generators and grid-tied networks with adjustable trip settings. Installed in ​switchgear panels, it ensures stable operation in power plants and industrial facilities.

Product functions(ANSI):50 | 51 | 49 | 50N/51N | 32 | 32R | 79 | 59 | 27 | 59N | 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

Product Introduction Technical Parameter Size

Product Introduction :
          The ​GWZC-9790N Reverse Power Protection Relay​ is a specialized protection device designed to detect and prevent reverse power flow in electrical systems, ensuring safe and stable operation. It monitors active power direction and trips the circuit breaker if power flows in reverse—such as from a generator back into the grid—preventing equipment damage. With adjustable trip thresholds and time delays,

          The ​GWZC-9790N Reverse Power Protection Relay is commonly installed in ​switchgear panels​ or ​protection relay cabinets​ near generators, transformers, or tie lines in ​medium-voltage (6.6kV–33kV) power systems. Ideal for ​generator protection, grid-tied systems, and industrial power networks, this relay enhances reliability in applications like backup power and renewable energy integration.

 

Product functionsANSI):

1.Instantaneous Overcurrent Protection (ANSI 50)
2.Time-delayed Overcurrent Protection (ANSI 51)
3.Backup Time-delayed Overcurrent Protection (ANSI 51)
4.Overload Protection (ANSI 49)
5.Residual Overcurrent Protection (ANSI 50N/51N)
6.Reverse Power Protection (ANSI 32)
7.Power Restoration (ANSI 32R)
8.Automatic Closing on Power-up (ANSI 79)
9.Overvoltage Protection (ANSI 59)
10.Undervoltage Protection (ANSI 27)
11.Residual Overvoltage Protection (ANSI 59N)
12.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

​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)

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GWZC-9790N Reverse Power Protection Relay
Reverse Power Protection Relay Side View
Reverse Power Protection Relay  Rear View
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