STUCKE SYMAP relay

STUCKE SYMAP relay

In ship power, offshore platforms, and industrial power distribution systems, digital protection relays undertake the protection, control, and interlocking tasks of key equipment such as generators, motors, transformers, feeders, and busbars. The STUCKE SYMAP series, as a multifunctional protection and control device manufactured in Hamburg, Germany, is commonly used in scenarios that require high reliability and long-term availability due to its three microprocessor architecture, rich communication interfaces, maritime classification society certification, and IEC 61850 capabilities. For engineers who are maintaining old protective cabinets, preparing to replace discontinued relays, or troubleshooting communication and tripping anomalies on site, understanding SYMAP's hardware logic, wiring characteristics, and diagnostic methods is more important than simply replacing spare parts. This article summarizes the key technical points and on-site troubleshooting strategies of the SYMAP series from the perspective of engineering deployment and maintenance.

Product positioning and lineage division

SYMAP is not a single model, but a series that covers multiple protected objects. The SYMAP Y series includes versions such as EC, ECG, F, G, M, T, LD, DC, BAT, which are designed for engine control, engine control with generator protection, feeder protection, generator protection, motor protection, transformer protection, line differential protection, DC protection, and battery/hybrid energy applications. The SYMAP BC series includes BC and BCG, positioned as multifunctional protection relays, with BCG also integrating power management functionality. For replacement projects, the first step is not to look at the model label on the old cabinet door, but to verify the actual protected object, number of circuit breakers, engine communication protocol, and whether differential protection is needed. If the old device is responsible for both generator protection and multi machine power management, BCG or ECG versions are usually closer to the original system function than a single protection model.

This series supports low, medium, and high voltage power systems, with protection functions that can be activated simultaneously and can control up to five main circuit breakers. It has display, control, and lockout management capabilities. The built-in small PLC can complete interlocking and custom control logic, and digital and analog output can be connected to the switch cabinet control circuit. For ships and offshore projects, the SYMAP series has Lloyd's Register, ABS, DNV, BV, CCS, PRS, NK, RINA, KR and other classification society type approvals, as well as CE and IEC 61850 KEMA certificates. Some versions also meet the DNV Cyber Secure Essential Type Approval, corresponding to IEC 62443-3-3 security level 1, which is particularly important for ship power systems that require remote monitoring and parameter setting.

Redundant Architecture and Security Design

The core security concept of SYMAP is "mutual supervision among multiple processors". The device uses three microprocessors internally, which supervise each other and form a watchdog system. Important functions are combined with dual redundancy and run independently by the second processor. For short-circuit protection, in addition to device body protection, CMA 198 current fed short-circuit redundancy board can also be selected to form a self powered short-circuit protection independent of SYMAP. This board can still operate when the system voltage is completely lost, making it suitable for situations where high continuity of short-circuit protection is required. CMA 198 is divided into versions A, B, and C: A is 1A secondary rated current, three-phase, short-circuit setting 2.0 to 7.0 times In; B is 1A, three-phase, 1.2 to 3.5 times In; C is 5A, three-phase, 2.0 to 7.0 times In. When replacing or installing, it is necessary to check the CT secondary rated current and setting range, and not just look at the appearance.

The significance of this redundant design for on-site maintenance is that when the device self checks and finds abnormalities in the memory, analog reference voltage, control power supply, binary input/output, or automatic test sequence, maintenance personnel should prioritize reading diagnostic information and event records, rather than directly determining that the main board is damaged. SYMAP also monitors parameters such as the power supply of the trip coil, the status of the switchgear, the start stop status of the motor, the temperature and pressure inside the cabinet, and the operating life of the circuit breaker. These monitoring quantities can serve as important criteria for determining whether there is a "protection misoperation" or a "peripheral circuit fault".

Key points for installation, wiring, and replacement

All connections of SYMAP are completed through back pluggable terminals, making it easy to replace the entire machine. The device size varies by series: the Y series is approximately 192 × 192 × 103 mm, weighing approximately 2.3 kg; the BC series is approximately 279 × 192 × 146 mm, weighing approximately 5 kg. The power supply options include 12-36 V DC, 36-72 V DC, 80-300 V DC, or 60-230 V AC, with a power consumption of less than 30 W. The working environment temperature ranges from -20 ℃ to+70 ℃, the front panel protection level is IP54, and the connection part is IP10. When replacing the old device, the power supply system, terminal spacing, and depth space inside the cabinet should be confirmed first to avoid the new device being able to power on but unable to close the door or terminal interference.