Products-GoLead Intelligent

SID-4720

Backup Power Seamless Transfer Device

Building on the proven performance and technical strengths of the previous generation, the newly launched SID‑4720 Backup Power Seamless Transfer Device offers enhanced reliability, intelligence, and flexibility.

The device platform adopts a dual-core heterogeneous architecture that achieves precise decoupling and coordinated operation between hard real-time control and application-level functions, balancing system reliability with agile feature iteration. A modular software architecture combined with graphical logic configuration ensures highly flexible functionality and configuration capabilities. It also features wide-range, high-precision measurement and intelligent plug-in self-diagnosis.

The system integrates multiple standby switching schemes and supports rapid startup under abnormal conditions, fault blocking, and healthy-phase identification, ensuring fast and seamless transfer to backup power in the event of a power source failure. A large-capacity storage module enables full lifecycle data retention for traceability and post-event analysis.

It supports mainstream communication protocols such as Modbus and IEC 60870-5-103/104, and is fully compatible with IEC 61850, meeting the networking and digital substation deployment requirements of multi-level protection and control systems.

The solution is ideal for power generation, petrochemical, coal mining, steel, and pharmaceutical applications where continuous power supply is critical.

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Main Functions

(1)
Built-in 6 automatic transfer schemes, supporting 5-switch transfer combinations, with options for customized schemes
(2)
Five types of analog quick-start criteria for abnormal power supply conditions, allowing flexible enabling/disabling. Includes voltage dip detection with rapid return-to-power-transfer functionality
(3)
Automatic fault discrimination and interlock functions, actively detecting internal faults and blocking switching operations
(4)
Multiple transfer initiation modes: manual normal transfer, abnormal condition transfer, and fault transfer
(5)
Multiple switching operation modes: parallel transfer, series transfer, simultaneous transfer, and semi-automatic parallel transfer
(6)
Five closing criteria with healthy bus phase selection, improving the success rate of rapid power source transfer
(7)
Coordinated control for special feeders such as generators, synchronous machines, and specific loads, including linked tripping and closing
(8)
Sectional load-shedding under low voltage, automatic ring network decoupling, switch status monitoring, overcurrent, and acceleration protection functions
(9)
Comprehensive switching operation reports displayed locally
(10)
Event recording and waveform capture features with export and backup capabilities, viewable via the host system
(11)
Supports multiple communication protocols: Modbus, IEC 60870-5-103/104, IEC 61850, as well as B-code time synchronization and SNTP time synchronization
(12)
Fiber-optic communication networking enables coordinated operation among multiple-level power transfer devices
(13)
Full support for IEC 61850 digital substation applications

KEY Features

1

Ruggedized 4U Industrial Chassis

Standard 4U 19-inch reinforced unit chassis, designed for high vibration and strong electromagnetic interference, suitable for harsh environments
2

High-Reliability Industrial-Grade Components

Integrated circuits use industrial or military-grade components to ensure superior stability and reliability, with built-in intelligent plug-in self-diagnostics
3

High-Speed, High-Precision Multi-Channel A/D Sampling

Wide-range, high-speed synchronous A/D sampling technology with 80 samples per cycle ensures high measurement accuracy
4

Dual-Core Heterogeneous Architecture

Dual-core heterogeneous design achieves precise decoupling and collaboration between hard real-time control and application layers, balancing system reliability with agile feature iteration
5

Modular Software & Graphical Logic Configuration

Modular software architecture with graphical logic development enables highly flexible function implementation and configuration
6

Large-Screen Color LCD Display

Large color LCD panel provides real-time display of the primary electrical single-line diagram, operating data, and event logs — intuitive, detailed, and easy to operate and commission
7

Comprehensive Power Loss Detection Logic

Multiple fast-start and interlock criteria for load-side power loss simulation reliably detect power system outage conditions
8

Large-Capacity Data Storage

Supports full-lifecycle storage and retention of device operation data for long-term analysis and traceability
9

Powerful Disturbance Recording

Advanced event waveform recording supports COMTRADE standard file format for storage and export
10

Versatile Communication Interfaces

Supports dual Ethernet and dual RS-485 ports, integrating multiple communication protocols including Modbus, IEC 60870-5-103, and IEC 60870-5-104
11

Time Synchronization Compatibility

Complies with common industry time synchronization standards and interfaces such as IRIG-B and SNTP
12

IEC 61850 Digital Substation Ready

Fully meets IEC 61850 communication and networking requirements for digital substation applications

SPECIFICATIONS

Rated Frequency

50 Hz or 60 Hz
PT Rated Voltage

100 V or 57.7 V
CT Rated Current

1 A or 5 A
Voltage Measurement

±0.3 V (Guaranteed range: 10% Un – 120% Un)
Current Measurement

±0.01 In (Guaranteed range: 0.05 In – 10 In)
Frequency Measurement

±0.01 Hz (Guaranteed range: 25.00 Hz – 65.00 Hz)
Phase Angle Measurement

±0.2° (Guaranteed range: 10% Un – 120% Un)
Rated Voltage of Digital Inputs

110 V or 220 V DC
Output Relays

Potential-free (dry) contacts
Communication Interfaces

Serial ports × 2
Ethernet ports × 3
Optical ports × 2
Operating Environment

Operating Temperature: −20 ~ +55 °C
Storage Temperature: −20 ~ +80 °C
Relative Humidity: ≤ 90%