HECS Series Generator Circuit-breakers
Key attributes
| Brand | ROCKWILL |
| Model NO. | HECS Series Generator Circuit-breakers |
| Rated voltage | 25.3kV |
| Rated normal current | 13.4kA |
| Rated frequency | 50/60Hz |
| Rated short-time withstand current | 130kA |
| Series | HECS Series |
Product descriptions from the supplier
Overview
The generator circuit-breaker systems are three-phase systems with a SF6 circuit-breaker and a discon-nector in single-phase enclosures, supplied fully assembled on a common frame, with operating mechanisms and control equipment. In addition to the circuit-breaker and disconnector, the generator circuit-breaker systems are available with earthing switch, starting switch, short-circuiting connection, current and voltage transformers, surge capacitor and surge arrester. The single line diagram of a generator circuit-breaker system type HECS is depicted in figure.
Market pioneer
The wide range of ratings with short-circuit currents from 80 to 130 kA makes HECS the most used GCB in the world suitable for power plants with a unit power of up to 800 MW. With small and standardized dimensions HECS is easy to install and highly suitable for replacements and retrofits in existing power plants. HECS has very low lifecycle cost with up to 20,000 close-open (CO) no-load operations or 20 years between main overhauls.
World leader with state-of-art technology
HECS products are type tested according to IEEE C37.013 and in certain aspects even exceed the minimum requirements of IEC/ IEEE 62271-37-013, including switching of fault currents with full phase opposition (180°; out-of-phase). It is also type tested to interrupt generator-source short-circuit current exhibiting delayed current zeros with up to 130% degree of asymmetry.
Digitally integrated with GMS600
HECS is fully integrated with GCB digital monitoring system, GMS600. The GMS600 can perform many functions: data logging, disturbance recording, drive supervi-sion, temperature and SF6 density monitoring. In addition, HECS supports integration of GMS600-A, a breakthrough solution which measures online the contact overlapping time and gives indication of the ablation without the need to go out of operation. Data logged through GMS600 can be connected via the clouds to Digital Enterprise Connect platform.
Compact design
HECS products are fully assembled and factory tested to bring substantial cost and time savings in installation and commissioning at site. Its compact design fits into standard containers for easy transportation, handling and storage.
Technology parameters
Related Products
-
HVS Series Generator circuit-breakers
-
HVR-63 Series Generator circuit-breakers
-
HECPS Series Generator circuit-breakers
-
HEC Series Generator circuit-breakers
-
Complete Set of Large Capacity 160kA Generator Circuit Breaker
-
Complete Set of Electric Brake Switch for 120kA Hydro-turbine Generating Units
-
HECS-R Series Generator circuit-breakers
Related Knowledges
-
Impact of DC Bias in Transformers at Renewable Energy Stations Near UHVDC Grounding ElectrodesImpact of DC Bias in Transformers at Renewable Energy Stations Near UHVDC Grounding ElectrodesWhen the grounding electrode of an Ultra-High-Voltage Direct Current (UHVDC) transmission system is located close to a renewable energy power station, the return current flowing through the earth can cause a rise in ground potential around the electrode area. This ground potential rise leads to a shift in the neutral-point potential of nearby power transformers, inducing DC bias (or DC offset) in their01/15/2026 -
HECI GCB for Generators – Fast SF6 Circuit Breaker1.Definition and Function1.1 Role of the Generator Circuit BreakerThe Generator Circuit Breaker (GCB) is a controllable disconnect point located between the generator and the step-up transformer, serving as an interface between the generator and the power grid. Its primary functions include isolating generator-side faults and enabling operational control during generator synchronization and grid connection. The operating principle of a GCB is not significantly different from that of a standard c01/06/2026 -
Distribution Equipment Transformer Testing, Inspection, and Maintenance1.Transformer Maintenance and Inspection Open the low-voltage (LV) circuit breaker of the transformer under maintenance, remove the control power fuse, and hang a “Do Not Close” warning sign on the switch handle. Open the high-voltage (HV) circuit breaker of the transformer under maintenance, close the grounding switch, fully discharge the transformer, lock the HV switchgear, and hang a “Do Not Close” warning sign on the switch handle. For dry-type transformer maintenance: first clean the porcel12/25/2025 -
How to Test Insulation Resistance of Distribution TransformersIn practical work, insulation resistance of distribution transformers is generally measured twice: the insulation resistance between thehigh-voltage (HV) windingand thelow-voltage (LV) winding plus the transformer tank, and the insulation resistance between theLV windingand theHV winding plus the transformer tank.If both measurements yield acceptable values, it indicates that the insulation among the HV winding, LV winding, and transformer tank is qualified. If either measurement fails, pairwise12/25/2025 -
Design Principles for Pole-Mounted Distribution TransformersDesign Principles for Pole-Mounted Distribution Transformers(1) Location and Layout PrinciplesPole-mounted transformer platforms should be located near the load center or close to critical loads, following the principle of “small capacity, multiple locations” to facilitate equipment replacement and maintenance. For residential power supply, three-phase transformers may be installed nearby based on current demand and future growth projections.(2) Capacity Selection for Three-Phase Pole-Mounted Tr12/25/2025 -
Transformer Noise Control Solutions for Different Installations1.Noise Mitigation for Ground-Level Independent Transformer RoomsMitigation Strategy:First, conduct a power-off inspection and maintenance of the transformer, including replacing aged insulating oil, checking and tightening all fasteners, and cleaning dust from the unit.Second, reinforce the transformer foundation or install vibration isolation devices—such as rubber pads or spring isolators—selected based on the severity of vibration.Finally, strengthen sound insulation at weak points of the ro12/25/2025
Related Solutions
-
Intelligent Operation Solution for 12kV Vacuum Circuit Breakers: Integrating Real-time Monitoring & Lifetime OptimizationⅠ. Equipment Operation & MaintenanceIntelligent Monitoring System IntegrationMulti-parameter Real-time Monitoring: Embedded sensors (temperature, displacement, Hall effect current sensors) track contact temperature rise, mechanical characteristics (opening/closing speed, overtravel), coil current, and partial discharge signals. Data undergoes preprocessing via edge computing prior to cloud upload.Lifetime Prediction Model: Dynamically evaluates remaining lifespan using electrical wear data06/10/2025 -
SF6 Circuit Breaker Solutions for Outdoor Installation (Anti-Pollution & Seismic Resistance)I.Core Challenges in Outdoor InstallationIn high-voltage transmission and distribution systems, SF6 circuit breakers are exposed to complex outdoor environments for extended periods, facing the following critical issues:Pollution & Insulation DegradationDust, salt fog, and industrial pollutants in outdoor environments easily adhere to equipment surfaces. In coastal or industrial areas, pollution levels may reach Class IV, resulting in insufficient creepage distance and triggering flasho05/12/2025 -
12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact Design12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact DesignⅠ. Executive SummarySoutheast Asia faces rapidly growing electricity demand alongside environmental challenges including high temperatures, humidity, salt spray corrosion, and grid instability. This solution recommends Solid Insulated Pole-Mounted Vacuum Circuit Breakers (VCB) featuring high reliability, compact design, and smart monitoring. Tailored for tropical climates and industrial scenarios, it06/10/2025
