Handheld 3-Phase Relay Protection Tester

MOEORW-WTW53 Handheld 3-Phase Relay Protection Tester (Aliases: Relay Protection Calibrator, Portable Comprehensive Protection Tester, Optical Fiber Differential Protection Tester), net weight 1.8kg, built-in lithium battery supports field tests without mains power.

It features 7 independent adjustable outputs (4 voltage + 3 current channels) with 1~24 harmonic superposition, 4 switch inputs and 2 isolated switch outputs, covering all relay protection calibration scenarios such as substation maintenance, switchgear inspection and engineering commissioning. Equipped with Linux industrial system, it integrates four test modules: AC/DC/Harmonic/State Sequence. Built-in GPS, 4G, WiFi, Ethernet and other communication ports support multi-unit synchronization and wireless remote control. Full-circuit multi-protection design, output accuracy meets power grid acceptance standards. Suitable for single field operation and bulk purchase, OEM customization available.

Mainboard & Display Configuration

AC Current Output

DC Current Output

AC Voltage Output

DC Voltage Output

Switch Quantity Parameters

Time Measurement

Physical Specifications

Ultra-light Integrated Handheld Body with Built-in Large-Capacity Lithium Battery for Independent Operation Overall dimension: 260mm×156mm×58mm, net weight only 1.8kg. Adopts high-density integrated structure of industrial control mainboard, DSP signal processor and linear power amplifier, abandoning traditional bulky split chassis. Equipped with built-in lithium battery to conduct on-site tests without external mains power. Compact size reduces warehouse occupation and logistics cost; single person can carry it to any working site, easy for batch distribution to working teams without handling burden.

7 Independent Decoupled Output Channels (4U+3I), All Types of Relay Protection Tests Completed by One Unit Equipped with 4 voltage output channels and 3 current output channels, amplitude, phase and frequency of each channel can be adjusted independently. Adopts high-precision D/A converter chip matched with low-pass filter circuit, generates analog waveforms via 32-bit double-precision algorithm with high waveform fidelity and ultra-low clutter interference. AC current output range: 0~10A; phase voltage 0~120V, line voltage 0~240V; DC voltage output ±160V, supports 1~24 harmonic superposition, fundamental frequency range 0~1200Hz. No auxiliary test equipment required, one unit completes all secondary circuit calibration work.

Industry-Leading High Precision Output Index, Compliant with Power Grid Acceptance & Bidding Technical Standards Output accuracy of AC voltage & current: ±0.1%; output accuracy of DC voltage & current: ±0.2%; time measurement range 0.1ms~9999s, measurement accuracy ＜0.1ms. Equipped with imported linear power amplifier module with full-range linear compensation, ultra-small output error. Test data records can be directly used for substation completion acceptance and technical response of power project bidding documents, strong compliance to improve bidding winning competitiveness.

Multi-Channel Integrated Communication Design, Supports Synchronous Test, Remote Management & Wireless Control Built-in GPS antenna port, 4G SIM card slot, dual USB ports, 10/100M adaptive Ethernet port, Bluetooth and dual WiFi modules; WiFi supports router mode & terminal mode. Adopts RK3568 quad-core industrial CPU (2.0GHz main frequency) and stable Linux industrial system, all communication channels are electrically isolated without mutual interference. GPS synchronous trigger for multiple units to complete optical fiber differential protection test; wireless connection with laptop without network cable, 4G network supports remote test data transmission and remote program upgrade, suitable for multi-team collaborative operation and unified management of off-site projects.

Multi-Layer Hardware & Software Full-Circuit Protection, Greatly Reduce Equipment Failure & Rework Rate Built-in five protection mechanisms: short circuit, overcurrent, overvoltage, over temperature and high current time limit. Power amplifier adopts imported high-power module with independent heat dissipation air duct, hardware & software dual real-time monitoring for output circuit. Continuous long-term output under 5A; software automatically limits power when output current exceeds 5A. Power amplifier will be cut off with pop-up alarm in case of short circuit or overload. Wrong wiring or misoperation on site will not burn the main unit, longer service life and lower after-sales maintenance cost for batch use.

Visual Full-English Operating Software with 4 Built-in Test Modules, Low Learning Threshold Dual operation mode: 5.6-inch 640*480 capacitive touch screen + physical function keys. Four core built-in test modules: AC Test, DC Test, Harmonic Test, State Sequence. Equipped with short-circuit calculation, fixed value scanning, fault playback and automatic storage & export of test reports. Built-in anti-shake algorithm and switch input AND/OR logic switching function, full English visual interface, no extra cost for supporting software development. Zero-basic electricians can complete full calibration process after short training.

Isolated Switch Quantity Channels, Compatible with All Mainstream Secondary Protection Circuits 4 switch input channels and 2 fast switch output channels, compatible with dry contact and potential contact. Dry contact identification threshold: "0" ≥20kΩ, "1" ≤10kΩ; potential contact: 0~6V for closed, 15~250V for open. Breaking capacity of output: AC/DC 250V/0.2A. Switch quantity circuit is fully opto-isolated from voltage & current output circuit to avoid host damage caused by secondary circuit interference, compatible with all comprehensive protection devices and switchgear secondary circuit detection on the market.

• Power Grid Substation Operation & Maintenance: Fixed value calibration, fault simulation playback and protection action time test for relay protection in 10kV/35kV/110kV substations;
• High & Low Voltage Complete Switchgear Factory: Full-function inspection of comprehensive protection devices before delivery, secondary circuit continuity test and protection logic verification;
• Power Engineering Construction Company: On-site commissioning and completion acceptance test of newly built substations and power distribution rooms;
• Third-Party Power Testing Institution: Inspection of relay protection equipment and issuing standardized test reports;
• Field Emergency Repair of Power Grid Teams: Portable emergency calibration in mountain areas, underground tunnels, narrow cable wells and other sites without mains power;
• Special Test for Optical Fiber Differential Protection: GPS synchronous trigger of multiple units for joint commissioning of line differential protection;
• Harmonic Protection Detection: Harmonic fault simulation test for capacitor harmonic protection and rectifier equipment;
• DC Control Circuit Calibration: Action characteristic test of DC power supply and DC protection devices.

The software starts automatically after power-on, the main interface is divided into 4 test modules and system setting functions with full Chinese visual operation:
1.AC Test: Customize amplitude, phase and frequency of three-phase voltage & current, support manual/automatic step change, automatically record protection action value, return value and action time; built-in short-circuit calculation tool, support sequence component and line component switching display;
2.State Sequence: Customize multiple groups of fault states, set output parameters, trigger conditions and delay time of each state to simulate continuous switching of multiple line faults;
3.DC Test: Adjust output of DC voltage & DC current, record test data of DC protection action and return;
4.Harmonic Test: Freely superimpose 1~24 harmonics and DC components, customize harmonic amplitude, phase and step length, suitable for harmonic protection detection;
5.Supporting System Functions: Device IP binding, local program upgrade, system rated parameter preset, WiFi router/terminal mode switching, test report saving & retrieval, configuration file import & export.