ST400PC/PT series intelligent measurement and control protection device

Product overview

ST400PC/PT series intelligent measurement and control protection device is a comprehensive measurement and control protection device developed by Suzhou Wanlong Electric Group Co., Ltd. after years of application experience and technology accumulation in the power industry, and combined with the development of technology at home and abroad, which integrates measurement, measurement and control, protection and communication. The device adopts the internal bus extension technology, adopts the multi-CPU modular design idea, and introduces the intelligent measurement and control protection device with strong anti-interference ability according to the application characteristics of power supply circuit (PC) and voltage transformer circuit (PT) in the power distribution system.

Product Features

The device adopts high-performance industrial-grade MCU design, built-in hardware multiplier, hardware divider, fast operation speed.
The device integrates monitoring, protection, control and communication functions
The device adopts a new modular design idea, the expansion module and the basic module are connected by internal bus, the external expansion function is convenient, and the basic module design does not need to be changed;
Device built-in two isolated 4-20mA output, the output parameters are optional, the output range is adjustable, the maximum load resistance can reach 1kΩ;
The device has 8 closing records, 8 opening records, 8 event records and 8 failure records, and has time mark indication, which is convenient for users to query and analyze accidents to the greatest extent;
The switching value of the device adopts strong current drive design, with long transmission distance and strong anti-interference ability.
The device has built-in Modbus-RTU and Profibus-DP standard field bus communication interface, which can realize the "four remote" function of the equipment and realize the remote communication management of the whole plant;
The device has the statistical function of active energy and reactive energy, which can realize the power load management of the plant area;
The device shall be provided with Chinese/English man-machine interface display;
The application of the device improves the PC circuit and PT circuit protection functions of the low-voltage distribution system;
The device adopts ferroelectric memory, which can be stored for hundreds of millions of times and for more than 10 years, ensuring the security of data.

Function Configuration

monitoring function
Breaker control circuit disconnection monitoring function, circuit breaker status monitoring function, circuit breaker fault alarm status monitoring function; Three-phase current, voltage, zero sequence current, voltage, power, functional factor, frequency, electric energy and other electrical parameter measurement functions; 2-way isolation 4-20mA transmission function.
Protection function
Time-limited quick-break protection, overcurrent I protection, overcurrent II protection, zero-sequence overcurrent protection, under-voltage I protection, under-voltage II protection, over-voltage protection, bus voltage loss protection, zero-sequence over-voltage protection, voltage imbalance protection, and post-acceleration protection.
Control function
According to the control authority, the circuit breaker can be closed/opened by means of panel, control terminal and communication. At the same time, according to the characteristics of molded case circuit breaker and frame circuit breaker, the device integrates the closing and opening control logic of two different circuit breakers.
Communication function
The device can support two independent Modbus-RTU and two independent Profibus-DP field bus communication interfaces, and the data format (length and sequence of variables) can be adjusted on site according to the requirements of users, which meets the requirements of engineering site networking to the greatest extent.
Manage maintenance functions
The device has records of operation times, trip times and closing/opening time, which is convenient for users to make statistics and analysis on the operation of the circuit. The device has the function of parameter inquiry and setting, and the setting interface is protected by password.
Recording function
The device has 8 historical information records such as closing, opening, SOE event, fault (timing standard function), etc., which facilitates the user's rapid query and analysis of historical events and the maintenance of equipment.