33kv/35kv Distance protection relay | Manufacturers Price Guide & Technical Specs

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GWZC-9812 Distance protection relay（21 | 21G | 21FL）

Applicable Scope ：The GWZC-9812 Distance Protection Relay is designed for comprehensive directional line protection, measurement, and control in electrical power systems with voltages below 35kV, specifically in non-directly grounded or resistance-grounded networks. This integrated device features core functions including distance, current, and voltage protection, as well as three-phase auto-reclosing as standard configurations.

Product functions（ANSI）：21 | 21G | 21FL | 68 | 50/51 | 50N/51N | 32 | 27 | 79 | 50HS/79 | 49 | 81U | 60FL
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 of Distance Protection Relay
The GWZC-9812 Distance Protection Relay is designed for comprehensive directional line protection, measurement, and control in electrical power systems with voltages below 35kV, specifically in non-directly grounded or resistance-grounded networks. This integrated device features core functions including distance, current, and voltage protection, as well as three-phase auto-reclosing as standard configurations.

The GWZC-9812 Distance Protection Relay is suitable for applications in substations, distribution stations, and industrial plants, providing reliable fault detection and system monitoring. The relay is typically installed locally in line switchgear cabinets for direct access or mounted in group panels within control rooms for centralized operations.

Product functions（ANSI）

1.Phase Distance Protection (3-Zone) (ANSI 21)
2.Ground Distance Protection (3-Zone) (ANSI 21G)
3.Fault Location (ANSI 21FL)
4.Asymmetrical Successive Trip Protection (ANSI 68)
5.Double-Circuit Successive Trip Protection (ANSI 68)
6.Phase Overcurrent Protection (3-Zone) (ANSI 50/51)
7.Zero-Sequence Overcurrent Protection (3-Zone) (ANSI 50N/51N)
8.Directional Blocking (ANSI 32)
9.Undervoltage Blocking (ANSI 27)
10.Automatic Reclosing (ANSI 79)
11.Reclosing Acceleration Protection (ANSI 50HS/79)
12.Overload Protection (ANSI 49)
13.Underfrequency Protection (ANSI 81U)
14.Undervoltage Protection (ANSI 27)
15.PT Fuse Failure Detection (ANSI 60FL)

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