ZX-803: Advanced 3-Phase Relay Testing for Modern Power Systems

In the evolving landscape of power system protection, the ZX-803 Three-Phase Relay Protection Test System stands out as a versatile and high-precision instrument designed to meet the rigorous demands of relay testing and fault simulation. Engineered to validate a wide range of protection relays—including current, voltage, directional, impedance, differential, and frequency relays—as well as microprocessor-based protection devices, the ZX-803 ensures reliability and accuracy in both laboratory and field environments. This article explores its advanced features, technical specifications, and applications in modern power systems.

Key Features

1.Flexible Voltage-Current Output Configuration
The ZX-803 offers a standard 4-phase voltage and 3-phase current output system, enabling customized combinations for diverse protection schemes. Each voltage phase delivers up to 120V, while the three current phases collectively provide 120A (parallel mode). The fourth voltage channel, Ux, supports multiple configurations, including 3U0, synchronization voltage, or user-defined values, enhancing adaptability for complex test scenarios.

2.Dual Operation Modes
Equipped with an integrated touchpad, keyboard, and a high-resolution TFT display running a Windows-based interface, the device supports standalone operation. For extended functionality, it seamlessly interfaces with external PCs or laptops, maintaining full feature parity across both modes.

3.High-Fidelity Linear Power Amplifier
Unlike conventional switching amplifiers, the ZX-803 employs a linear power amplifier to ensure minimal waveform distortion across its entire output range (from microcurrents to 120A). This design eliminates high-frequency interference, guaranteeing precision in dynamic testing environments.

4.Advanced DSP-Based Host System
A dedicated DSP (Digital Signal Processor) core enables real-time signal processing, high-speed computations, and ultra-precise D/A conversion. Combined with a compact, lightweight chassis (16kg), the system achieves exceptional portability without compromising performance, making it ideal for on-site testing.

5.Robust Software Suite
The embedded software streamlines complex workflows, offering automated testing, fault replay, real-time data logging, vector diagram visualization, and report generation. Users can perform detailed parameter sweeps, transient fault simulations, and protection characteristic validations with ease.

6.Integrated DC Power Supply
A dedicated adjustable DC output (110V/220V, 1.5A) eliminates the need for external sources when testing relays requiring auxiliary power, simplifying field setups.

7.Enhanced Connectivity and Safety
With 8 digital inputs (compatible with dry contacts or 0-250V signals) and 4 programmable outputs, the device supports comprehensive I/O integration. Additional interfaces include USB, RS232, and keyboard/mouse ports. Built-in safeguards—such as soft-start power, thermal management, and fault diagnostics—ensure operational reliability.

Technical Specifications

1.AC Current Output: 3×40A (450VA per phase), 120A (parallel, 1000VA)

2.AC Voltage Output: 4×120V (80VA per phase), 240V line-line (120VA)

3.DC Output: 3×±10A (200VA), 3×±160V (80VA)

4.Accuracy: 0.2% (AC), 0.5% (DC)

5.Frequency Range: 0–1200Hz (±0.001Hz resolution)

6.Phase Control: 0–360° (±0.2° accuracy)

7.Harmonic Injection: Up to 24th order

8.Dimensions: 396×354×178mm | Weight: 16kg

Applications
The ZX-803 excels in scenarios requiring precise relay calibration, including:

1.Grid Protection Schemes: Testing differential, distance, and directional relays.

2.Generator/Transformer Protection: Validating overcurrent, underfrequency, and synchronization logic.

3.Fault Analysis: Simulating transient/transitional faults for relay response evaluation.

4.Microprocessor-Based Relay Validation: Automated testing of digital protection algorithms.
Combining cutting-edge hardware design, intuitive software, and unmatched versatility, the ZX-803 Three-Phase Relay Protection Test System redefines efficiency in protection relay commissioning and maintenance. Its compact form factor, dual operation modes, and high-fidelity outputs make it indispensable for utilities, industrial facilities, and testing laboratories striving to ensure grid reliability in an era of increasingly complex power systems. By bridging the gap between laboratory-grade precision and field-ready robustness, the ZX-803 empowers engineers to tackle modern protection challenges with confidence.

GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/