Product description

SMG-231 intelligent self-powered microcomputer protection device (hereinafter referred to as device), taking into account the actual situation of the current distribution network, in order to solve the opening and closing, box changes and other distribution system ring network equipment secondary power draw problem. Using power supply, sampling integration program, only a current transformer sampling, you can achieve the normal power supply device. The device has two over-current, inverse time overcurrent, zero-sequence ground protection and other protection functions, can be applied to bus, line, distribution transformers and other protection situations.

Features

○ device using power, sampling integration program, any phase current up to 5% ln, the device can work:

○ Enhanced unit chassis according to anti-strong vibration, strong interference design, especially adapted to harsh environments:

○ The machine adopts low-power design technology to ensure reliable protection under any conditions, fast start:

○ integrated circuit used in all industrial products, making the device has a high stability and reliability:

○ 32-bit microcontrollers with built-in high-capacity RAM and Flash memory, integrated high-precision high-speed AD, central processing with single-cycle multiplier and hardware divider, data processing, logical processing and information storage capacity, reliable High, fast:

○ Using high-precision A / D sampling, data acquisition 32 points per cycle, the first software Rc filter in the use of FFT, to ensure high sampling accuracy and protection of computing accuracy:

○ highly reliable electromagnetic compatibility design, circuit board using surface mount technology and multilayer technology, selection of fast transient voltage suppression devices, the device has a strong electromagnetic compatibility:

○ Designed for the ring network cabinet compact space design of the structure, easy to install:

○ Graphical LCD, all Chinese display menu man-machine interaction: real-time display of various operating conditions and data, detailed information intuitive, easy to operate, easy to debug:

○ High-capacity information recording: can save up to 64 recent historical reports, with action parameters, power-down to maintain, easy to accident analysis:

○ communication interface for high-speed magnetic isolation standard RS485 interface, communication protocol using IEC68570-103 protocol, can be directly connected with the computer monitoring or communication management machine network communication:

○ protection of exports can be configured in accordance with the protection of export settings convenient and flexible:

○ sampling current-type transmitter selection, high sampling accuracy, anti-interference ability.

Monitoring and control functions

○ Measuring IA, IB, lC three-phase current

○ Breaker remote control sub-gate

○ 7-channel switching input

○ Switch position acquisition

○ 1 switch output: alarm,

○ 1 active pulse output: tripping 

Communication function

○ Optional high-speed magnetic isolation by standard RS485 interface or magnetic isolation high-speed standard CAN2.OB interface; (two of the two one, when ordering)

○ RS485 interface communication protocol is IEC60870-103 communication protocol

○ CAN2.OB interface communication protocol for the IEC60870-104 protocol

Technical Parameters

○ AC rated current: 5A or 1A (specified when ordering);

○ Operating frequency: 50Hz;

○ Power supply: 1: AC / DC universal AC / DC1 5-65V 2: Self-powered, from the current transformer to take power;

○ current measurement accuracy: 0.5;

○ protection action export time: 1.5 times the value of protection action time is not dry 35ms;

○ out of the node: continuous connected 220V, 5A current (purely resistive load);

○ AC current circuit: 2 times the rated current, continuous work;

○ 10 times the rated current, allowing 10s;

○ 4 times the amount of fixed current: to allow 1s;

○ Setting range: AC current: 0.1A ~ 99.99A;

○ Zero sequence current: 0.1A ~ 12A;

○ Setting error: Current element: ≤ ± 3% or ± 0.1A;

○ Zero sequence current: ≤ ± 3% ± 0.1A;

○ Time element: ≤ ± 1% setting or ± 40m.

Protection function

○ quick-break protection

○ Overcurrent protection

○ Overload protection

○ Inverse time overcurrent protection

○ Inverse time overload protection

○ Zero sequence overcurrent protection

○ Over-temperature trip protection

○ heavy gas protection

Wiring schematic

Outline and hole size (mm)