Six-Phase Relay Protection Tester

Product Introduction

The MEJB-W1200F Microprocessor-Based Relay Protection Tester is a professional device manufactured by Wuhan Du'en Intelligent Electric. It supports flexible combination outputs of 6-phase voltage and 6-phase current, equipped with a high-fidelity linear power amplifier and a DSP-controlled host. Its powerful software encompasses 20 test modules including AC, DC, and harmonic superposition tests. It precisely performs setting verification, characteristic testing, and fault reproduction for various relays and microprocessor-based protection devices. Suitable for operation, maintenance, acceptance, and R&D scenarios in 6-35kV power systems.

Product Parameter (specification)

Model	MEJB-1200F
Number of current channels	Standard 6- phase
Number of voltage channels	Standard 6- phase
AC current output range	30 A /phase or 180 A ( six in parallel )
DC current output range	10 ADC / Phase
AC voltage output range	120 VAC / phase
DC voltage output range	160 VDC / phase
Rated parameters
-AC current output	Output per phase (RMS value) when 6-phase current output. 0 ～ 30A Output accuracy 0.2 class Output per phase (RMS value) for 3- phase current output 0 ～ 60A 6-phase parallel current output (RMS) 0 ～ 180A Permissible long-term operating value of phase current (RMS): 10 A Maximum output power of phase current : 450 VA Maximum output power when 6-phase parallel current is at maximum output 10 00VA The maximum allowable operating time for 6-phase parallel current is 10 seconds. Frequency range (fundamental frequency) : 0–1000 Hz Harmonic number 0 to 20 times
-DC current output	Current output 0 to ±10 A per phase Output accuracy class 0.2 Maximum output load voltage 20 V
-AC voltage output	Phase voltage output (RMS ) : 0 ～ 120V Output accuracy class 0.2 Line voltage output (RMS) 0 ～240V Phase voltage/line voltage output power 80VA / 100VA range (fundamental frequency) : 0–1000 Hz Harmonic order 0 to 20
-DC voltage output	Phase voltage output amplitude : 0 to ± 160V Output accuracy class 0.2 Line voltage output amplitude 0 ～ ± 320V Phase voltage/line voltage output power 70VA / 140VA
-Switch quantity	8- channel digital input empty contact 1 ~ 20mA , 24V Potential contacts connected to " 0 ": 0 ~ +6V ; " 1 ": +11V ~ +250V V 4 pairs of digital outputs DC : 220 V / 0.2 A ; AC : 220 V / 0.5 A
-Time measurement range	0.1 m s ~ 9999 s Measurement accuracy <0.1ms

Product feature and application

Flexible Voltage and Current Output Configuration Supports up to 6-phase voltage and 6-phase current outputs, with customizable combinations to achieve conventional 4-phase voltage/3-phase current, 6-phase voltage, 6-phase current, or 12-phase output modes. This design ensures compatibility with traditional testing methods while facilitating three-phase transformer differential tests, plant power rapid switching tests, and automatic backup power transfer tests.
Operation Method The device connects directly to a laptop or desktop computer for operation, offering convenience, speed, and stable performance.
New High-Fidelity Linear Amplifier The output consistently employs high-fidelity, high-reliability modular linear amplifiers instead of switching amplifiers, delivering outstanding performance. It generates no high- or medium-frequency interference at the test site and ensures smooth waveforms with excellent accuracy across the entire range from high currents to minute currents.
High-Performance Host The output section employs DSP control, featuring fast processing speed, robust real-time digital signal processing capabilities, wide transmission bandwidth, and control of high-resolution D/A conversion. Output waveforms exhibit high precision, low distortion, and excellent linearity. Incorporating advanced technologies, precision components, and specialized structural design, the device is compact, lightweight, fully functional, and portable. It operates immediately upon startup, making it highly convenient for mobile testing.
Powerful Software Capabilities Capable of executing highly automated large-scale complex calibration tasks. Facilitates testing and scanning of various protection settings, fault replay, real-time storage of test data, vector diagram display, and online report printing. Six-phase current capability enables convenient three-phase differential protection testing.
Independent Dedicated DC Power Output Equipped with one dedicated adjustable DC power output channel supporting 110V and 220V.
Comprehensive Interfaces Equipped with a USB communication port for interfacing with computers and other external devices.
Robust Self-Protection Features a well-designed heat dissipation structure, reliable hardware protection measures, soft power-up functionality, software self-diagnostics for faults, and output lockout capabilities.

Prodection details

Core Application Scenarios

- Relay Testing:

Covers various AC/DC relays including signal, time, intermediate, and reclosing relays, verifying operating values, return values, and operating times.

- Line Protection Testing:

Performs setting verification, impedance characteristic testing, and reclosing/post-acceleration tests for overcurrent, voltage, zero-sequence, and distance line protections.

- Component Protection Testing:

Conducts proportional and harmonic restraint characteristic tests for differential protections of transformers, generators, etc.

- Special Protection Testing:

Validates frequency and voltage lockout/action characteristics for low-frequency load shedding, high-frequency generator tripping, synchronizing devices, etc.

- Fault Reproduction:

Replays fault recording data to verify protection device response performance under realistic fault scenarios.

Applicable Fields

- Power Operation & Maintenance:

Routine commissioning and periodic calibration of protection devices in substations and power plants.

- Project Acceptance:

Pre-commissioning testing of protection devices in new or upgraded power projects.

- Equipment R&D:

Performance verification and development validation for relay protection manufacturers.

Company Qualifications

FAQ

1)What are the operational features of the MEJB-W1200F Microprocessor-Based Relay Protection Tester?

Answer: The device requires direct connection to a laptop or desktop computer for operation, offering convenient, efficient, and stable performance. It features a 9.7-inch TFT true-color LCD display, a trackball mouse, and an optimized panel keyboard. Test process control can be performed using either the trackball mouse or an external mouse, ensuring intuitive and user-friendly operation.

2)What type of power amplifier does the MEJB-W1200F Microcomputer-Based Relay Protection Tester use, and what are its advantages?

Answer: The output stage employs a high-fidelity, high-reliability modular linear power amplifier rather than a switching amplifier. This design prevents high- and mid-frequency interference at the test site while ensuring smooth waveforms and excellent accuracy across the entire range from high currents to minute currents. It can directly output DC, square waves, superimposed harmonic waveforms, and fault transient waveforms.

3)What aspects does the self-protection function of the MEJB-W1200F Microcomputer-Based Relay Protection Tester cover?

Answer: It features comprehensive self-protection capabilities, including a well-designed heat dissipation structure and reliable, complete hardware protection measures. It incorporates a soft-start function for the power supply, with software capable of fault self-diagnosis and output blocking. The power amplifier circuit includes comprehensive overheat, overcurrent, overvoltage, and short-circuit protection. In cases of overcurrent in the current loop, overload or short-circuit in the voltage loop, it automatically limits output power, shuts down the power amplifier circuit, and issues an alarm signal. A software timeout is implemented during high-current output to prevent overheating of the power amplifier circuit.

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