33KV & 35KV PT Paralleling Relay |Technical Specs Manufacturers & Price Guide

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GWZC-9852 PT Paralleling relay

Applicable Scope：The GWZC-9852 PT Paralleling Relay ensures safe voltage synchronization in 33kV/66kV systems by verifying phase, frequency and magnitude alignment. Installed in switchgear and generator panels, it prevents out-of-phase switching with adjustable thresholds and dead bus detection.

Product functions（ANSI）：59 | 59N | 27/59

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:
The GWZC-9852 PT Synchronizing Relay is a specialized protection device used in 33kV, 66kV, and higher voltage substations and power plants to ensure safe synchronization of voltage sources before closing circuit breakers.

PT Synchronizing Relay performs voltage, phase angle, and frequency checks between two power sources (e.g., bus and line voltages) and prevents out-of-phase switching, dead bus energization, or improper generator synchronization. Typically installed in switchgear panels, bus coupler cubicles, and generator control panels.

PT Synchronizing Relay enhances system reliability by allowing adjustable synchronization thresholds (voltage difference, phase angle, and slip frequency) to prevent equipment damage during grid interconnection or system restoration.

Product functions（ANSI）：

1.Overvoltage Protection (ANSI 59)
2.Zero Sequence Overvoltage Protection (ANSI 59N)
3.Potential Transformer Parallel (ANSI 27/59)

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