Description
1. Product Overview
Alstom SPU232.2 (part No. 029.366 817) is an industrial‑grade high‑precision auxiliary relay developed by Alstom of France for power relay‑protection systems, high‑voltage switchgears and substation secondary circuits, and belongs to the special secondary component for power systems. It is applicable to relay‑protection devices, breaker control circuits, signal circuits and interlock circuits of traditional and intelligent substations. It is mainly used for electrical signal expansion, circuit interlocking, status transfer and protection‑contact capacity expansion. It serves as a standard supporting component with extremely high stability in secondary control circuits of high‑voltage distribution systems. Manufactured in compliance with strict original‑equipment industrial standards, this product features strong anti‑interference performance, long service life and precise operation. It is widely matched with the full range of Alstom protection‑measurement‑control devices and mainstream high‑voltage complete‑set equipment at home and abroad, and adapts to long‑term non‑stop operation conditions of the power industry.
2. Technical Parameters
2.1 Electrical Parameters
- Model: SPU232.2
- OEM Part Number: 029.366 817
- Operating Voltage: Compatible with standard DC 220 V / DC 110 V control power supply for power industry, matching the power‑supply system of substation DC panels
- Contact Capacity: Standard power‑grade contact load, which can stably carry the rated current of secondary control circuits and meet load requirements of signal, interlock and tripping circuits
- Operating Characteristics: Fast energized operation, zero‑delay reset, high operation consistency, no mis‑operation caused by hysteresis
- Insulation Class: Special insulation standard for high‑voltage secondary power circuits, high insulation strength and excellent voltage‑withstanding performance
- Contact Resistance: Extremely low and stable contact resistance; no heating or poor‑contact issues after long‑time operation
2.2 Environmental and Mechanical Parameters
- Operating Temperature: ‑25 ℃ ~ +70 ℃, suitable for wide‑temperature working conditions such as power‑distribution rooms and outdoor cabinet‑type substations
- Protection Class: Meets protection standards for cabinet‑mounted industrial installation, dust‑proof and moisture‑resistant
- Seismic Resistance Grade: Power‑equipment‑specific anti‑seismic design, capable of withstanding vibration and impact inside switchgears
- Mechanical Service Life: Million‑level ultra‑long mechanical operation life, satisfying frequent‑action demands of long‑running power equipment
- Mounting Method: Standard DIN‑rail mounting, adapting to standardized secondary‑circuit layout of power‑distribution cabinets
3. Product Functions and Advantages
3.1 Core Product Functions
- Contact Capacity Expansion: Solve the problem of insufficient auxiliary contacts of relay‑protection devices and circuit‑breakers, and realize synchronous transfer and expanded output of multi‑channel signals.
- Circuit Interlock Control: Applied for closing‑opening interlock, electrical interlocking and logic blocking of switchgear, eliminating potential safety hazards such as mis‑operation and false closing.
- Protection‑Signal Transfer: Accurately transmit protection tripping, alarm and equipment‑status signals to realize hierarchical upload and local indication of fault signals.
- Secondary‑Circuit Isolation: Achieve electrical isolation between control circuits and signal circuits, prevent circuit crosstalk and voltage back‑feed, and ensure safe and stable operation of the secondary system.
3.2 Core Product Advantages
- Ultra‑high Stability for Power‑grade Application: Custom‑designed for substation secondary circuits with powerful electromagnetic‑interference resistance. It can withstand strong electromagnetic‑field environment inside high‑voltage cabinets and avoid unwanted operation or failure to operate.
- High‑precision and Consistent Operation: Accurate coil parameters and sophisticated mechanical structure guarantee consistent operation sequence for every action and precise timing matching of relay‑protection logic.
- Extended Service Life: Arc‑resistant and wear‑resistant contact materials are adopted. Its mechanical and electrical service life far exceeds that of ordinary industrial‑control relays, making it suitable for 24‑hour non‑stop power‑system operation.
- Strong Compatibility: Perfectly compatible with all Alstom protection devices, as well as mainstream domestic protection systems including NARI, Xuji and Sifang. It can be universally used in new‑build and renovation projects of old substations.
- Maintenance‑free High‑reliability Design: Free of vulnerable components and periodic calibration. It can run stably for a long period after commissioning and greatly reduce the maintenance workload of secondary circuits.
- Standardized Installation Compatibility: Universal DIN‑rail mounting with standard wiring and neat layout, suitable for secondary renovation and new installation projects of various high‑voltage switchgears, ring‑main units and control cabinets.
4. Application Scenarios
- Substation Secondary‑circuit System: Contact expansion and interlocking for control, signal and protection circuits of high‑/low‑voltage switchgears
- Power Relay‑protection Supporting: Auxiliary‑control, signal‑transfer and logic‑blocking unit matched with original Alstom protection devices
- High‑voltage Switch Equipment: Electrical interlock for closing and opening of circuit‑breakers and disconnectors, and expansion of status‑feedback signals
- Smart‑grid Renovation Projects: Secondary‑circuit upgrade, signal‑system capacity expansion and logic‑optimization reconstruction of ageing substations
- Self‑owned Power Stations for Industrial and Mining Enterprises: Secondary control and signal‑acquisition supporting for high‑voltage systems of factory power‑distribution rooms and captive power plants
- New‑energy Power Stations: Secondary interlock and auxiliary control of protection signals for switchgears in photovoltaic and wind‑power step‑up substations
5. Installation, Operation and Maintenance Guidelines
- Install the equipment in a standard electrical cabinet with dry, dust‑free and non‑corrosive‑gas environment. Avoid poor contact of contacts caused by damp condensation and dust accumulation.
- Wire strictly in accordance with secondary drawings and distinguish the positive and negative poles of the control power supply to prevent coil burnout and logic abnormality caused by reverse or wrong wiring.
- Fasten wiring terminals tightly. Inspect terminals regularly for looseness during long‑term operation so as to avoid overheating from virtual connection and signal interruption.
- Never operate under over‑rated‑voltage or over‑contact‑load conditions to prevent contact ablation and adhesion, which would impair the reliability of protection logic.
- Carry out operation tests before commissioning to verify the accuracy of energized action, reset status and contact on‑off, and ensure matching with protection logic.
- Do not disassemble the equipment without permission during maintenance. Replace the faulty unit with original spare parts of the same model to guarantee consistent parameters and stable operation of the secondary circuit.
- Inspect the operating status periodically, identify hidden dangers such as abnormal noise, overheating and contact failure, and implement predictive maintenance for secondary circuits.
