GSLMS

Authorized Product : GSLMS

(Generator stator cooling water Leakage Monitoring system)

Among causes of generator failure, failure due to leakage of stator cooling water accounts for the highest proportion at 35% (KEPRI)
The GSLMS, manufactured by Powercomtec Co., Ltd., has proven its quality and performance as the water-cooled generator stator cool waterant leakage monitoring system has already been installed and is in operation at 40 power plants in Korea. Operators are highly satisfied.

: Boryeong Thermal Power Plant, Taean Thermal Power Plant, Samcheonpo Thermal Power Plant, Yeongheung Thermal Power Plant, Shin-Kori Nuclear Power Plant, etc

GSLMS installation allows for the real-time measurement of dissolved hydrogen gas concentration, enabling fault diagnosis in advance.
Portable hydrogen leak measurement device has been patented in Korea (by Korea Power Chemtech), and it can be used for portable measurement in power plants where GSLMS is not installed

"The biggest cause of failure in water-cooled generators is stator cooling water leakage"

Stator manufacturing defect & winding vibration -> coolant leakage -> insulation failure -> block stop
Leakage in the generator stator windings begins 15 years after commissioning (EPRI)
Among major failures of water-cooled generators, leakage accounts for the highest proportion at 34% (KEPRI)
What is the impact of hydrogen leakage in stator coolant?

: Insulation failure accident case due to leakage : melting of fine wire

: Cooling water ingress into the generator → causes failure and shortens service life

Generator Stator & GSLMS

The generator stator GSLMS system was developed and manufactured by Korea Power Chemtech Inc.
There are 40 units installed and in operation, including thermal, nuclear, and combined-cycle power plants in Korea.
The stability of system operation has been ensured by the electrical staff, resulting in high satisfaction

Configuration of GSLMS

Principle of Leak Monitoring

: Stator hydrogen leak -> hydrogen enters the cooling water -> real-time continuous detection of dissolved hydrogen

GSLMS Advantage: Leak testing during operation Continuous measurement during driving enables monitoring trends in hydrogen leak concentration
The hydrogen leak test results were confirmed to match the GSLMS data and the OH inspection results, so no separate inspection is necessary

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