Siemens SIPROTEC 5 Series Relay Protection and Automation Equipment

Core positioning

Product Series: SIPROTEC 5 Full Series Digital Protection and Measurement Devices

Version: V8.4 firmware, sample version 7 (replacing version 6)

Purpose: Equipment selection, functional comparison, scheme design, standard compliance, engineering configuration

Applicable scenarios: power plants, high/ultra-high voltage transmission, medium voltage distribution networks, industrial power supply, new energy grid connection

Core innovation highlights (5 major advantages)

Integrated whole process engineering

From system design → parameter configuration → debugging → operation and maintenance full process toolchain (DIGSI 5, Web UI, digital twin), cross vendor IEC 61850 configuration.

Modular software and hardware customization

Hardware I/O, communication, and functionality can be flexibly expanded, compatible with all applications on the same platform, reducing spare parts and training costs.

Native smart grid communication

Supports IEC 61850 Edition 2, process bus (9-2), OPC UA PubSub, cloud access (MindSphere), and dual Ethernet redundancy (PRP/HSR).

Full dimensional security design

Hardware encryption, RBAC permissions, security logs, signed firmware, IEEE 802.1X authentication, meeting NERC CIP and other network security standards.

Advanced power grid stability monitoring

Built in PMU synchronous phasor, arc protection, transient grounding fault detection, adaptive protection parameters, supporting flexible power grid and new energy integration.

Full series equipment models and main functions (core)

Classified by protected objects, covering lines, transformers, motors, generators, busbars, capacitors, merging units, fault recording, etc.:

Application scenarios of core protection functions for device models

7SJ81/82/85/86 overcurrent/feeder protection medium voltage distribution network, backup protection, capacitor bank

7SA82/86/87 Distance Protection for High Voltage/Ultra High Voltage Transmission Lines

7SD82/86/87 differential protection for long and short lines, cables, and multi terminal power supplies

7SL82/86/87 differential+distance dual main protection for important lines and high reliability scenarios

7UT82/85/86/87 Transformer Differential Protection Two/Three/Five Winding Transformers, Autotransformers

7SK82/85 motor protection for high voltage asynchronous/synchronous motors

7UM85 generator/unit protection water/fire/wind turbine unit, 100% stator grounding

7SS85 busbar protection for medium and high voltage busbars, centralized/distributed

7VE85 synchronous/parallel device generator grid connection, system synchronization

6MD85/86 Interval Controller Substation Interval Control and Interlocking

6MU85 merging unit digital substation process bus

7KE85 fault recording+power quality fault analysis, PQ monitoring

7VK87 Circuit Breaker Management: Circuit Breaker Lifespan and Operation Control

Core functional system (full coverage)

1. Protection function (ANSI standard full coverage)

Overcurrent/time limit/inverse time limit/directional overcurrent (50/51/67)

Distance protection (21), line differential (87L), transformer differential (87T)

Generator 100% stator grounding (64S), demagnetization (40), reverse power (32)

Motor overheating (49), stalling (48), imbalance (46)

Bus differential (87B), capacitor imbalance (60C), overvoltage/undervoltage (27/59)

Arc protection, transient grounding fault, frequency tracking (10-80Hz)

2. Control and Automation

Circuit breaker control, isolation switch/grounding switch interlock

Automatic reclosing (79), transformer voltage regulation (90V)

Simultaneous grid connection (25), opening and closing phase control (PoW)

Graphic Logic Programming (CFC, IEC 61131-3)

3. Monitoring and recording

PMU synchronous phasor (IEEE C37.118)

Fault recording, SOE event sequence, load monitoring

Circuit breaker wear statistics and temperature measurement (RTD)

Basic monitoring of power quality (THD, voltage sag/interruption, imbalance)

4. Communication interface

Ethernet: IEC 61850 Edition 2, Modbus TCP, DNP3, PROFINET

Serial port: IEC 60870-5-103/104

Process bus: IEC 61850-9-2 SV (sampled values)

Redundancy: PRP/HSR/RSTP, dual network independent

5. Cybersecurity

Role Based Access Control (RBAC)

TLS encrypted communication, tamper proof security logs

Signature firmware, hardware encryption chip

Network Access Authentication (802.1X)

Hardware and modular design

Structure: 1/3, 1/2, 2/3, 1U 19 inch standard chassis, rail/panel installation

Scalability: Supports hot swappable expansion of I/O, communication, and arc fiber modules

Environment: Module standard conformal coating, wide temperature range, strong anti-interference

interface

Analog quantity: current/voltage input

Switching quantity: BI/BO flexible configuration

Communication: Dual electrical/optical ports, supporting process bus clients

Engineering toolchain (full lifecycle support)

DIGSI 5: Unified Engineering Configuration Software, Full Series Offline/Online Debugging

Web UI: Direct browser access without software installation

IEC 61850 System Configurator: Cross vendor Substation System Configuration

SIGRA: Fault waveform analysis

DigitalTwin: Digital Twin, Cloud Pre Debugging

Dashboard: Status Visualization Operations and Maintenance

Typical application scheme (sample key diagram)

Medium voltage distribution network: 7SJ85 multi feedback line protection, direction comparison, grounding fault line selection

High voltage line: 7SL differential+distance dual main protection, compatible with SIPROTEC 4/5 across

Transformer: 7UT8 multi winding differential, limited grounding fault protection

Generator: 7UM85 complete unit protection, 20Hz injection type 100% stator grounding

Digital substation: 6MU85 merging unit+process bus+IEC 61850-9-2

Busbar: 7SS85 centralized/distributed busbar protection

Capacitor bank: 7SJ integrated protection for imbalance, overvoltage, and differential

Standards and Certification

Function: IEC 60255, IEC 61850 Edition 2, ANSI

Safety: IEC 61508 (SIL), ISO 13849 (PL e/Cat. 4)

Electromagnetic compatibility: IEC 61000

Cybersecurity: ISO/IEC 27001, NERC CIP