HV/MV Equipment
Digital Solutions for HV switchgear
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CSD100
Point-on-Wave Controller
Point-on-wave switching is a technique consisting in operating AC system switchgear / circuit-breaker at optimum time to reduce switching transients GE’s CSD100 is an advanced Controlled Switching Device for high voltage AC circuit-breakers. The ability to mitigate switching transients is becoming a key issue for today’s grids as the generated stresses lead to power quality problems and accelerated aging. CSD100, associated with circuit-breakers, provides utilities with a cost-effective, streamlined solution to protect utility assets and improve system reliability by minimizing risks and operation costs. CSD100 is able to intercept operation orders, compute optimal targets, and drive the circuit breaker actuators, thanks to dedicated system voltage and current inputs as well as power outputs. By doing so, a slight delay (some tens of milliseconds) is applied. CSD100 is able to extend asset lifetime by limiting switching transients and consequent stress applied on equipment using controlled switching technique. CSD100 is applicable for
Benefits:
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CSD100 Operation Cycle
Controlled Switching of Load compensation
CSD100 is an advanced controlled switching device for high voltage AC circuit-breakers for any kind of application.
Challenges
Intermittent power sources generate important daily load variations. Capacitor banks and shunt reactors help stabilize and improve the power factor. Acting as reactive power generators, their switching needs to be controlled precisely to mitigate the related electrical transients. It allows to limit damageable stress on the circuit-breaker and the compensation load.
Reactive Power Compensation in Safe Conditions
CSD100, used with GE's advanced circuit-breakers, is a cost-effective solution to reduce stress on reactive power compensation equipment and increase their lifetime.
Benefit :
CSD100 Operation Cycle
Controlled Switching of Overhead Lines
CSD100 is an advanced controlled switching device for high voltage AC circuit-breakers for any kind of application.
Challenges
Connecting and disconnecting intermittent power sources -such as wind or solar farms, pumped storage or gas power plants- to the country grid may generate switching transients with damageable consequences for the transformer and the power quality (high inrush currents, voltage dip, protection trip).
Safe Connection of the Transformers to the Grid
CSD100 reduces power transformer inrush current and voltage deep by energizing each phase (winding) at magnetic flux continuity condition, considering the transformer core residual flux.
CSD100 takes into consideration the transformer magnetic flux in order to switch and connect the transformer to the lines when the source flux matches the transformer residual flux. The inrush current and voltage dip are minimized. The power quality is improved, the transformer lifetime is extended.
Benefits:
CSD100 Operation Cycle
Controlled Switching of Overhead Lines
CSD100 is an advanced controlled switching device for high voltage AC circuit-breakers for any kind of application.
Challenges
Power generation sources are often located far from main consumption areas. As a result, large amounts of energy need to be transmitted over long distances. The random circuit- breaker switching of no-load lines generates a travelling voltage wave which, provokes an over-voltage along the length of the line. Also, auto-reclosing of the line circuit-breaker may cause even larger over-voltages than simple closing due to trapped charge on the line.
Safe Switching of Overhead Lines
CSD100 is a cost-effective solution to limit overvoltage during closing and auto-reclosing of line circuit-breakers.
CSD100 helps to optimize line design and could generate important savings at the conception stage. The value of over-voltages directly determines the insulation and protection levels of the lines, as well as their cost.
Securing Your Primary Equipment
Benefits:
Controlled switching of multiple loads
CSD100 is an advanced controlled switching device for high voltage AC circuit-breakers for any kind of application.
Challenges
Depending on substation architecture, one single circuit-breaker will operate different loads. Maintain optimal performance in such situation is a real challenge.
One single Controlled Switching Device per Circuit-breaker
GE has developed for the CSD100 a multiple load switching feature, allowing to use one single device per circuit-breaker.
The positions of the substation apparatus (circuit-breakers, disconnector switches) define the load to switch. The CSD100 selects the programmed switching strategy accordingly.
Benefits:
Example of multiple load switching. Circuit breaker may be used to switch line or reactor or a power transformer.
