33kV/66kV Transformer Protection Relay Manufacturers & Prices

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GWZC-9821 Transformer protection relay

Applicable Scope：The VIP-96S72 Transformer Protective Relayis designed for protection, measurement, and control applications in 66kV, 33kV, and 11kV substations, distribution stations, and power plants. It is typically installed in both incoming and outgoing line switchgear cabinets within these facilities.
Product functions: 51P/27 | 51I | 51N | 49 | 46 | 59/27/59N
Communication functions: Support for IEC 60870-5-103 over Ethernet, MODBUS RTU, and IEC 61850 protocols; equipped with 2× Ethernet ports (IEEE 802.3) and 2× RS-485 interfaces (ANSI/TIA-485-A).
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 Description

The GWZC-9821 Capacitor Protection Relay provides comprehensive protection for 6.6kV–33kV capacitor banks in substations and industrial power systems. Equipped with high-speed DSP processing and 16-bit precision sampling, it accurately detects faults while mitigating harmonic and inrush current impacts. Supports IEC 61850, DNP3.0, and Modbus protocols via dual Ethernet and RS-485 interfaces for seamless grid integration.

Product functionsANSI）：

1.Three-stage Phase Overcurrent Protection (with Voltage Blocking) ANSI 51P/27
①Instantaneous Overcurrent Protection (Stage I)（IEEE 50P/51P-1）
②Time-Delayed Overcurrent Protection (Stage II)（IEEE 51P-2）
③Backup Overcurrent Protection (Stage III)（IEEE 51P-3）

2.Inverse Time Phase Overcurrent Protection | ANSI 51I

3.Three-stage Zero-sequence Overcurrent Protection | ANSI 51N

4.Overload Protection | ANSI 49

5.Three-stage Low-side Zero-sequence Overcurrent Protection | ANSI 51N

6.Negative-sequence Overcurrent Protection | ANSI 46

7.Voltage Protection (Overvoltage, Zero-sequence Overvoltage, Undervoltage) | ANSI 59/27/59N

8.Control Circuit Failure Alarm | IEC 61850 ALM

9.PT (Potential Transformer) Failure Alarm |IEC 61850 ALM

10.Non-electrical Protection | IEC 61850 PTOF

11.PT Loss of Voltage (Alarm) | IEC 61850 ALM

System Power Loss (Alarm/Trip Option) | IEC 61850 ALM/PTOC

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