6 Phase Relay Test Set

MOEORW-WTW60T series microcomputer relay protection tester is a multi-channel secondary injection test device independently developed by Wuhan Moen Intelligent Electric Co., Ltd., fully compliant with domestic and international power testing standards. The series includes MOEORW-WTW60TA, MOEORW-WTW60TB and MOEORW-WTW60T three configurations with differentiated voltage & current output channels to match different substation, power plant and industrial power secondary testing demands.

This tester integrates embedded industrial control unit, independent analog output sources and professional test software modules. It covers full calibration of line protection, transformer protection, generator-transformer unit protection, capacitor protection, motor protection and auto-switch equipment. Equipped with built-in rotary mouse, digital keypad, multi-group optical isolation switching I/O and network communication interface, it supports standalone local operation and remote PC control via cross-over Ethernet cable. All test data can be stored, previewed and exported to USB flash drive for standardized test report output, applicable to routine maintenance, commissioning and type test of all microprocessor-based protection devices and electromagnetic relays.

Model Channel Configuration Table

Hardware Interface Parameters

Software & Signal Parameters

Hardware Design Advantages
1.Modular independent analog output source: Each voltage/current channel operates without mutual coupling, supports single-phase, parallel multi-phase output configuration for differential and zero-sequence testing.
2.Multi-mode switching input circuit: Optoelectronic isolation eliminates ground loop interference, compatible with all protection trip, reclosing and lockout contact signals on site without external conversion accessories.
3.Dual operation architecture: Standalone operation via embedded industrial control unit without external PC; remote full-function control via Ethernet for laboratory batch testing.
4.Dedicated auxiliary DC power supply: On-board 110/220V DC output avoids external power supply wiring during relay coil testing.
5.Firmware online upgrade: USB flash drive upgrade function without disassembling hardware, supports iterative software function update.

Core Software Test Modules & Application Value
All modules support automatic test parameter scanning, manual fixed value injection, trigger timing measurement and one-click report storage, classified by protection equipment types for quick navigation via built-in debugging wizard.
1.Arbitrary Test Module Supports manual fixed output, automatic amplitude/frequency/phase sweep and single-shot trigger pulse. Realizes action value, reset value and operating time measurement for all general relays and protection elements, with built-in short-circuit impedance calculation tool for fault parameter automatic derivation.
2.Relay Dedicated Test Modules Independent modules for current, voltage, time and intermediate relays; automatically calculate operating current, reset current and reset coefficient, support overcurrent, undervoltage, directional relay characteristic scanning.

Protection Fixed Value Calibration Modules

Distance Protection Check: Calibrate phase/earth distance I~III section impedance, impedance time ladder characteristics, support zero-sequence compensation coefficient configuration.

Zero-sequence Protection Check: Verify zero-sequence current segment fixed values, zero-sequence directional boundary angle and fault phase simulation.

Three/Six-Phase Differential Test: Generate transformer/gen-transformer ratio braking curves, auto calculate braking coefficient, support multi-side CT ratio balance setting and harmonic braking test coordination.

• System Condition Simulation Modules

Low Frequency / Under Voltage Load Shedding: Simulate df/dt and dv/dt smooth slip change, step frequency/voltage variation, test slip blocking and action timing.
Power Direction Test: Automatic search directional relay sensitive and boundary angles, linear / dichotomy scanning modes optional.
System Oscillation Module: Simulate pure oscillation and oscillation superimposed fault, test distance blocking and generator out-of-step protection.
Power Frequency Variation Test: Verify power frequency change distance protection operating logic under m=0.9 / m=1.1 fault conditions.

• Auto-reclosing & Synchronism Modules

Synchronism Test: Measure allow voltage/frequency difference, closing advance angle and closing time of synchronizing relay.
Synchrocheck / No-voltage Check: Simulate fault state, reclosing waiting state and post-fault voltage condition for reclosing logic verification.
Group Test Module: Complete transient & permanent fault simulation, coordinate trip and reclosing contact timing logic for full-set transmission test.
1.Custom State Sequence Module User-defined multi-state voltage/current output logic, pre-configured bus auto-switch test flow for automatic transfer equipment sequential logic verification, support sequence file import & export.
2.Auxiliary Test Functions Harmonic test for transformer inrush braking, PT disconnection fault simulation, conversion fault simulation, state oscillation simulation, test report storage, preview and USB batch export.

Software Operation Features
1.Debugging Wizard Classification: Modules sorted by line, transformer, generator, capacitor, motor and busbar protection, quickly match corresponding test functions without manual module lookup.
2.Parameter Pre-set Template: Built-in parameter templates for mainstream protection models (NR978, BP-2B, RCS-915 etc.), reduce on-site parameter configuration time.
3.Multi-judgment Logic Configuration: Switch input logic supports AND / OR mode, customizable action trigger edge (rising / falling edge).
4.Report Standardization: All test records store test time, equipment model, fixed value deviation and action time, export printable PDF reports via USB.
5.System Self-repair Function: F1 disk scan & F2 backup program switching solve software startup failure without re-installation.

Power Grid Substation Secondary Commissioning & Maintenance

• Overhead / cable line distance, zero-sequence, high-frequency protection full calibration
• Bus differential, busbar failure, bus charging protection group transmission test
• Busbar auto-switch (BATS) sequential logic verification
   

Power Plant Generator & Transformer Test

• Main transformer differential, compound voltage overcurrent, overexcitation, overload protection
• Generator inter-turn, stator earth loss-of-excitation, out-of-step, negative sequence overload protection
• Generator-transformer unit integrated group test
   

Industrial Power Distribution System

• Motor overload, inverse time overcurrent, negative sequence, zero-sequence protection
• Capacitor bank current and compound voltage blocking protection
   

Equipment Manufacturer Type Test Laboratory

• Electromagnetic relay batch calibration
• New microcomputer protection device fixed value and logic verification
   

Electric Power Research & Training Institutions

• Power system fault simulation teaching, protection characteristic research test

Domestic Power Industry Standards

• DL/T 624-2023 Technical Conditions for Microcomputer Relay Protection Test Devices
• DL/T 1153-2012 Calibration Specification for Relay Protection Testers
• GB/T 7261-2016 Basic Test Methods for Relay and Automatic Safety Devices
   

International Electrotechnical Standard

• IEC 60255 Measuring Relays and Protection Equipment General Requirements

1.Main METW-60T series tester unit ×1
2.Voltage test cable set (VA/VB/VC/VN, Va/Vb/Vc/Vn) ×1
3.Current test cable set (IA/IB/IC/IN, Ia/Ib/Ic/In) ×1
4.Switch input signal wire (multi-color, opto-isolation terminal matching) ×1 set
5.Cross-over Ethernet communication cable for PC linkage ×1
6.USB flash drive for report export & firmware upgrade ×1
7.Printed English operation manual + calibration certificate ×1 set
8.Power input cable (220V AC) ×1

Routine Maintenance Requirements
1.Storage environment: Ambient temperature -10℃ ~ +45℃, relative humidity ≤90% non-condensation, no corrosive gas, dust-proof storage.
2.Pre-operation inspection: Check cable insulation integrity, terminal screw tightness before each test; avoid short-circuit of analog output terminals.
3.Post-test operation: Cut off analog output first then power off; clean cable terminal metal contacts regularly to eliminate oxidation.
4.Periodic calibration: Annual metrological calibration per DL/T 1153 to guarantee output precision.
 

Common Fault Diagnosis
Failure to connect with external PC

• Verify communication toggle switch is set to position "E"; use designated cross-over Ethernet cable
• Confirm PC fixed IP as 192.168.0.188, turn off firewall blocking network port
• Execute F1 disk scan on tester main interface then restart software

Test software fails to launch

• Press F1 to scan disk; if invalid, press F2 to switch backup solidified program for operation
• Connect external USB keyboard, format D disk and restore backup firmware

No analog voltage/current output after clicking Test

• Check system setting analog channel configuration matches actual wiring (3V3I / 6V6I)
• Verify longest fault time parameter longer than protection action fixed value
• Confirm no hardware overload alarm (restart after cooling if overload buzzer triggers)

Switch input cannot capture protection contact action

• Check contact wiring polarity for channel 3 potential input; set correct high/low trigger edge in module parameters
• Increase switch input jitter resolution to match contact bounce time