Description

1. Product Overview

GE IS200ESYSH1A (abbreviated as ESYS board) is a dedicated excitation system interface board for GE Vernova EX2100e generator excitation control system, compatible with Mark VI / Mark VIe turbine control platform. It serves as the core signal interaction board between the excitation controller and field primary equipment & external interlock circuits.

Equipped with built-in isolation transformers, it collects PT three-phase voltage and CT three-phase current signals of generators, and uniformly processes full-type excitation measuring point signals including 4~20mA/±10V analog signals, excitation discrete signals and trip relay outputs. It matches HSSL/HSLA terminal bases for field cable transition. The board integrates hardware signal isolation, loop short-circuit protection and full-channel fault self-diagnosis, supports hot-swap rack maintenance, and has UL and CE industrial safety certifications. Featuring wide-temperature industrial hardware architecture, it is widely applied in complete excitation systems of thermal steam turbine generators, gas turbine generators and hydropower generators, commonly used for spare replacement of aged boards in legacy EX2100e excitation cabinets, measuring point expansion of excitation systems and upgrading renovation projects of unit excitation control loops.

2. Hardware Structure and Composition

2.1 PT/CT High-precision Isolation Acquisition Unit

Two independent three-phase voltage isolation transformers and two three-phase current isolation transformers are integrated on the board, supporting simultaneous access of 2 sets of PT voltage and 2 sets of CT current primary signals to complete high-precision transmission and collection of generator terminal voltage, stator current and reactive power. The internal circuits are fully electrically isolated to block high voltage from primary side into control loops. The transformer delivers high linearity to ensure accurate operation data for excitation voltage regulation and PSS power system stabilizer algorithms, eliminating abnormal voltage regulation caused by distorted collection data.

2.2 Multi-type Analog/Digital Signal Processing Unit

Multiple universal signal processing channels are integrated, compatible with 4~20mA 2-wire transmitters and ±10V voltage analog inputs. It also supports collection of excitation auxiliary contacts, knife gate positions, fan status and other discrete signals. Two independent trip relay output loops are configured to directly drive unit shutdown lock interlock equipment. Each signal channel is equipped with independent filter circuits to filter electromagnetic harmonics from plant frequency converters and high-voltage busbars.

2.3 Backplane High-speed Communication & Logic Interaction Unit

A dedicated high-speed backplane connector for Mark VI series is arranged at the rear, realizing real-time bidirectional data interaction with UCVE main controllers through rack backplane. It uploads collected voltage, current, measuring point status and fault codes, and receives excitation regulation and interlock trip commands issued by the main controller. Built-in non-volatile memory locally caches excitation operation curves, channel fault records and SOE event timestamps, and retains data permanently after power loss for unit accident tracing and analysis.

2.4 Rack Plug-in & Shielded Earthing Protection Unit

The standard drawer plug-in structure for Mark VI series 16-slot racks supports online hot-swap replacement without shutdown of the whole excitation system. Multiple dedicated earthing contacts are reserved around the board. When inserted into an earthed metal rack, a complete shielding loop is formed to suppress common-mode electromagnetic interference. Strong and weak current wiring areas are physically separated. The full series ESYS interface boards maintain full backward compatibility in hardware and software, enabling direct on-site replacement of legacy boards of the same specification without large-scale modification to original terminal bases and field cables.

3. Technical Specifications

3.1 Electrical Specifications

System Power Supply: 125VDC nominal DC supply, input range 85~150VDC
Primary Acquisition: 2 sets of 3-phase PT voltage inputs, 2 sets of 3-phase CT current inputs with built-in isolation transformers
Analog Signal Channels: Supports standard industrial analog signals 4~20mA, ±10V
Digital Loops: Multiple DI excitation status collection channels, 2 independent DO trip relay outputs
Channel Dielectric Withstand Voltage: 1500VAC between channel to ground and channel to backplane
Backplane Bus: Mark VI proprietary high-speed I/O backplane bus
Typical Power Consumption: ≤15W

3.2 Environmental Specifications

Operating Temperature: -40℃ ~ +70℃; Storage & Transportation Temperature: -40℃ ~ +85℃
Relative Humidity: 5%~95% RH, non-condensing, free of corrosive acid gas and conductive dust

3.3 Mechanical Specifications

Mounting Method: Drawer-type hot-swap installation for standard Mark VI racks
Overall Dimensions: H 318mm × W 45mm × D 200mm
Net Weight: Approx. 2.5kg
Enclosure Material: Flame-retardant epoxy PCB + metal shielding frame
Optional Accessories: HSSL/HSLA terminal bases, shielded PT/CT secondary cables, EX2100e configuration software, rack redundant 24V/125V power supply modules

4. Product Functions and Features

Integrated PT/CT isolated acquisition ensures high precision of excitation voltage regulation control

Built-in dedicated isolation transformers directly collect generator primary electrical signals without additional transmitters, isolating high-voltage primary loops. Stable linear collection data provides accurate raw data for AVR automatic voltage regulation, PSS stability control and over-excitation/under-excitation limit algorithms, guaranteeing stable output of grid-connected generator voltage and reactive power.

Full-channel signal self-diagnosis enables accurate fault location and rapid alarm

Full self-inspection of PT, CT, analog channels and relay loops during power-on, real-time monitoring of faults such as wire breakage, over-range, short circuit and transformer abnormality during operation. Layered LED status indicators on the front panel provide visual prompts, and standardized fault messages are pushed to upper excitation monitoring systems synchronously to shorten fault troubleshooting time of excitation systems.

Dual independent trip relay outputs meet unit interlock safety specifications

Two physically isolated trip output loops can drive unit shutdown lock and excitation switch-off interlock equipment separately. The two loops operate independently, and fault of single loop will not affect trip function of the other loop, meeting multi-layer safety interlock design requirements of generator sets and reducing risk of operation failure.

Wide-temperature full-isolation industrial design adapts to complex electromagnetic conditions in power plants

The full-channel electrical isolation architecture with metal rack shielding earthing resists strong electromagnetic radiation from high-voltage busbars and high-power frequency converters in power plants. The ultra-wide operating temperature range of -40℃~+70℃ adapts to high-temperature and dusty environments of boiler and turbine workshops, supporting 24/7 continuous operation of generator sets.

Hot-swap modular architecture enables spare replacement without unit shutdown

Online hot swapping of boards is supported for maintenance and spare replacement without cutting off main power of excitation systems or unit grid-disconnection shutdown, minimizing power generation loss caused by equipment maintenance and adapting to maintenance demands of continuously running power generation units.

Standardized compatible architecture simplifies spare replacement and system capacity expansion

Fully compatible with the complete EX2100e excitation control platform, legacy faulty IS200ESYSH1A boards can be directly replaced on site without re-modifying original terminal bases, PT/CT secondary cables and configuration logic. New excitation measuring points can be expanded by adding corresponding channels, delivering short construction and commissioning cycles for technical renovation projects.

5. Applicable Working Conditions and Application Scenarios

EX2100e excitation control systems for large thermal power plant steam turbine generator sets, core matching boards for generator PT/CT electrical quantity collection, AVR voltage regulation and unit trip interlock signal collection & control.
Complete excitation devices for gas turbine combined cycle power plants, centralized signal processing scenarios for excitation fans, knife gate positions and reactive power regulation analog measuring points.
Excitation control cabinets of hydropower hydro-generators and distributed new energy power stations, signal transition projects for voltage & current collection, over-excitation limit and PSS stability control.
New construction, measuring point expansion and intelligent remote monitoring renovation projects of excitation systems for self-owned power plants in steel and chemical plants.

GE IS200ESYSH1A Excitation Control System I/O Interface Module