Product Introduction

The LDJB-702 Three-Phase Relay Protection Tester employs a high-speed, high-performance digital control processor as the control computer. The software applies double-precision algorithms to generate high-precision waveforms for each phase. With its integrated structure, the components are tightly integrated, featuring short data transmission distances and a compact design. It overcomes the issue of fewer waveform points in laptop-controlled measurement instruments due to long data communication lines and narrow bandwidth.

The LDJB-702 Three-Phase Relay Protection Tester utilizes a high-speed, high-resolution D/A converter, ensuring accuracy and linearity of current and voltage across the entire range. With its high D/A resolution and dense fitting, the tester features minimal waveform distortion and harmonic components, requiring low pass filter specifications. This results in excellent transient, phase, and amplitude characteristics, making it easy to achieve precise phase shifting and harmonic superposition, while maintaining high accuracy at high frequencies.

The LDJB-702 Three-Phase Sequential Relay Protection Tester does not use current and voltage raisers for each phase current and voltage. Instead, it employs a direct output method, allowing the current and voltage sources to directly output waveforms ranging from DC to waveforms containing various frequency components, such as square waves, combined waveforms of various harmonics, and transient fault waveforms. This enables it to effectively simulate the current and voltage characteristics during various short-circuit faults.

The LDJB-702 Three-phase Relay Protection Tester is compatible with both open contacts and 0~250V potential contacts for switch quantity input circuits. In potential mode, 0~6V is closed, and 11~250V is open. Switch quantities can conveniently measure the action time and time difference of each phase switch contact.

The LDJB-702 Three-phase Relay Protection Tester features a 320×240 pixel high-resolution blue-backlit LCD display. The entire testing process and results are displayed on the screen, with a full Chinese interface that is clear and aesthetically pleasing. Operation is controlled via a rotary mouse and two buttons, with all data and testing processes set on the screen using the rotary mouse. The operation is simple and convenient, easy to master.

The LDJB-702 three-phase relay protector tester is equipped with a single adjustable DC power supply output on the bottom plate of the cabinet, which includes two voltage levels of 110V and 220V, serving as an auxiliary power source for on-site tests. The output current of this power supply can reach 1.5A. Additionally, the bottom plate is fitted with a cooling fan, a power outlet, ground terminals, and three fuses. Among the three fuses, one is an auxiliary DC power fuse (2A/250V), and two are voltage circuit fuses (2A/250V).

Product Synonyms: Microcomputer Relay Protection Tester, Microcomputer Relay Protection Instrument, Relay Protection Tester, Three-Phase Relay Protection Tester, Relay Protection Tester, Three-Phase Relay Protection Tester, Three-Phase Relay Protection Verifier, Relay Protection Verifier, Three-Phase Relay Protection Verifier, Relay Instrument, Relay Protection Device Tester

Product Features

◆ Standard 4-phase voltage and 3-phase current output – Featuring 4-phase voltage and 3-phase current output, it allows for easy combination outputs for various types of protection tests. Each phase voltage can output 120V, and the three-phase current can output 120A. The fourth phase voltage Ux is a multi-functional voltage item, which can be set to output as 4 different 3U0 or同期 voltage, or any arbitrary voltage value.

Single-machine operation is convenient. The machine is controlled via a user-friendly, flexible rotary mouse through a large LCD screen with all Chinese display. It can complete most on-site testing and calibration tasks, including the calibration of various relays and microcomputer protections, and can simulate various complex instantaneous and switching faults for comprehensive testing. It's ready to use upon startup, with quick and easy operation.

Dual operating modes, connects to computer for operation. With a full set of Chinese operation software on Windows platform, it can perform various large-scale, complex, and highly automated verification tasks. It allows for easy testing and scanning of various protective setpoints, real-time storage of test data, display of vector graphics, plotting fault waveforms, online printing of reports, and more.

The software is powerful, capable of performing various highly automated complex verification tasks, such as differential protection tests, quick power supply switching, backup and self-starting tests, line protection同期 reclosing, etc. It allows for convenient testing and scanning of various protection settings, fault playback, real-time storage of test data, display of vector graphs, and online report printing.

The relay protection tester features rich switch points with 8-way switch point inputs and 4-pair no-contact outputs. The input points are compatible with no-contact and 0-250V potential points, capable of intelligent automatic identification. Input and output points can be expanded according to user requirements.

◆ Large Screen LCD Display - Equipped with a high-resolution 320×240 pixel matrix large screen LCD display, all operations are set on the display screen. The operation interface and test results are displayed in simplified Chinese, ensuring an intuitive and clear view.

Self-protection features include a well-designed heat dissipation structure, reliable and comprehensive protection measures, soft power start, as well as certain fault self-diagnosis and lockout functions.

The unit features an independent dedicated DC power output with a single 110V and 220V adjustable DC power output.

High cost-performance; a cross-disciplinary collaborative design product that integrates advanced scientific and technological achievements from multiple fields. It combines the performance of large-scale testing equipment with the price of small-scale testing equipment, offering an excellent performance-to-price ratio.