SHANGWEI SHANGWEI

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Phase-to-ground short circuit monitoring and protection device MSDXD-9

Real-time monitoring: real-time display of the zero-sequence current of the monitored line is helpful for maintenance personnel to accurately judge the insulation status of the system and make maintenance plans.

Key words:

Shangwei Electric

Classification:

Intelligent Switch Cabinet Components Products

Product Consulting:

 

+86-312-6783322

 

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  • Description

  • 1. features
    1. Real-time monitoring: real-time display of the zero-sequence current of the monitored line, which is helpful for maintenance personnel to accurately judge the insulation status of the system and make maintenance plans.
    2. Two-level early warning and three-level trip function: supports two-level early warning. When the system detects that the grounding current exceeds the early warning set value, it will give an alarm and automatically delay and adjust to the lower-level set value until the trip cuts off the faulty line or motor. The corresponding third-level trip action time and trip setting value can be set according to the on-site working conditions to avoid starting unbalanced current and cooperate with higher-level zero sequence protection to prevent large-level trip from causing power failure. You can also choose to only alarm without tripping.
    3. High sensitivity and small size zero sequence current transformer: In order to facilitate the installation of zero sequence current transformer, the company's intelligent leakage transformer adopts "ultra-micro crystal iron core" and "zero flux technology" automatic compensation design, so that the transformer is always in the ideal "zero flux" working state, improve the sensitivity of the transformer and reduce the size of the transformer.
    2. product parameters
    1. Working power supply: AC/DC220V ± 20%
    2. Alarm trip: normally open contact, capacity DC250V,1A
    3. Panel display: large-screen LCD display, friendly interface, intuitive and convenient operation.
    4. Voltage grade: 0.4kV
    5. Monitoring capacity: up to 9 channels can be monitored online at the same time
    6. Input current: 3 ~ 120mA
    7. Accuracy: ± 0.1A or 2%
    8. Grounding warning: 3 ~ 100A, 3 ~ 100A can be set
    9. Grounding trip: 5 ~ 100A, 5 ~ 100A (can be switched back and set)
    10. History: can store 100 records, power down without loss
    11. Data transmission: RS485 bus, MODBUS-RTU communication protocol
    12. Installation: embedded
    13. Working environment: temperature:-10 ℃ ~ 50 ℃; relative humidity: ≤ 90%
    3. Implementation Scheme
    The phase-to-ground short circuit on-line monitoring and protection device collects zero sequence current in real time, can alarm first and then trip, control the shunt coil attached to the molded case circuit breaker to trip the circuit breaker, and upload the fault data to the upper computer through RS485 bus, and the upper computer displays and records the zero sequence current data and historical data in real time.

     

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