The Experts below are selected from a list of 630 Experts worldwide ranked by ideXlab platform

Aidan M. Graham - One of the best experts on this subject based on the ideXlab platform.

  • Impact of Available Fault Current Variations on Arc-Flash Calculations
    IEEE Transactions on Industry Applications, 2010
    Co-Authors: Ilanchezhian Balasubramanian, Aidan M. Graham
    Abstract:

    Prior to the arrival of the arc-flash hazard analysis and the incident energy calculations, it was common practice to perform Short-Circuit studies assuming an infinite source on the primary of the service transformer. With the main goal of a Short-Circuit study being to compare the maximum calculated Short-Circuit current to the Short-Circuit Rating of protective devices, using an infinite source resulted in the most conservative Short-Circuit current. However, since the amount of energy available in an arc-flash incident is not only dependent on the available Short-Circuit current but also on the clearing time of the protective device, the assumption of an infinite source on the transformer primary will not guarantee the most conservative results for the incident energy calculations downstream of the transformer. This paper examines the effect of the utility available fault current on the incident energy calculations and proposes a new method to calculate the conservative arc-flash results in the event that the actual utility fault information is not available.

  • impact of available fault current variations on arc flash calculations
    Petroleum and Chemical Industry Technical Conference, 2009
    Co-Authors: Ilanchezhian Balasubramanian, Aidan M. Graham
    Abstract:

    Prior to the arrival of the arc-flash hazard analysis and incident energy calculations, it was common practice to perform Short-Circuit studies assuming an infinite source on the primary of the service transformer. With the main goal of a Short-Circuit study being to compare the maximum calculated Short-Circuit current to the Short-Circuit Rating of protective devices, using an infinite source resulted in the most conservative Short-Circuit current. However, since the amount of energy available in an arc-flash incident is not only dependent on the available Short-Circuit current, but also on the clearing time of the protective device, the assumption of an infinite source on the transformer primary will not guarantee the most conservative results for incident energy calculations downstream of the transformer. This paper examines the effect of utility available fault current on incident energy calculations and provides the study engineer with a list of reasonable assumptions that can be made in the event that actual utility fault information is not available.

Ilanchezhian Balasubramanian - One of the best experts on this subject based on the ideXlab platform.

  • Impact of Available Fault Current Variations on Arc-Flash Calculations
    IEEE Transactions on Industry Applications, 2010
    Co-Authors: Ilanchezhian Balasubramanian, Aidan M. Graham
    Abstract:

    Prior to the arrival of the arc-flash hazard analysis and the incident energy calculations, it was common practice to perform Short-Circuit studies assuming an infinite source on the primary of the service transformer. With the main goal of a Short-Circuit study being to compare the maximum calculated Short-Circuit current to the Short-Circuit Rating of protective devices, using an infinite source resulted in the most conservative Short-Circuit current. However, since the amount of energy available in an arc-flash incident is not only dependent on the available Short-Circuit current but also on the clearing time of the protective device, the assumption of an infinite source on the transformer primary will not guarantee the most conservative results for the incident energy calculations downstream of the transformer. This paper examines the effect of the utility available fault current on the incident energy calculations and proposes a new method to calculate the conservative arc-flash results in the event that the actual utility fault information is not available.

  • impact of available fault current variations on arc flash calculations
    Petroleum and Chemical Industry Technical Conference, 2009
    Co-Authors: Ilanchezhian Balasubramanian, Aidan M. Graham
    Abstract:

    Prior to the arrival of the arc-flash hazard analysis and incident energy calculations, it was common practice to perform Short-Circuit studies assuming an infinite source on the primary of the service transformer. With the main goal of a Short-Circuit study being to compare the maximum calculated Short-Circuit current to the Short-Circuit Rating of protective devices, using an infinite source resulted in the most conservative Short-Circuit current. However, since the amount of energy available in an arc-flash incident is not only dependent on the available Short-Circuit current, but also on the clearing time of the protective device, the assumption of an infinite source on the transformer primary will not guarantee the most conservative results for incident energy calculations downstream of the transformer. This paper examines the effect of utility available fault current on incident energy calculations and provides the study engineer with a list of reasonable assumptions that can be made in the event that actual utility fault information is not available.

N. J. Buch - One of the best experts on this subject based on the ideXlab platform.

  • Solid State Electronic Fault Current Limiter to Limit the Fault Current in Power System
    2010
    Co-Authors: Vinod Gupta, U. C. Trivedi, N. J. Buch
    Abstract:

    Increase in power generation capacity of electric power systems has lead to increase in the fault current level which can exceed the maximum designed Short-Circuit Ratings of the switchgear. All the equipment therefore must have a Short-Circuit Rating capable to withstand this level. Short-Circuit currents contain extremely high energy and can damage electrical equipment. Typically, the Circuit breakers open automatically in three to six cycles when a fault occurs. But Circuit breakers, sometimes cannot handle the intense level of faults, as they are designed to handle designed faults current level so they fail to "break" and force a system to collapse. Advanced current interruption technology, utilizing high power Solid-State Fault Current Limiters (SSFCL) offers a viable solution to the transmission and distribution system problems caused by high system fault current. The SSFCL alleviates the Short Circuit condition in both downstream devices by limiting fault currents. To interrupt the current, SSFCL must rapidly insert an energy absorbing element (e.g. resistor) into the Circuit to limit the fault current. A proper design of current limiting device will ensure that the fault current in the system is kept as low as possible in order to limit the surge current Rating of the thyristor and also to minimize stresses on the power system network.

Piotr Lubicki - One of the best experts on this subject based on the ideXlab platform.

  • Placement of Fault Current Limiters in a Power System Through a Two-Stage Optimization Approach
    IEEE Transactions on Power Systems, 2018
    Co-Authors: Hong-tzer Yang, Wen-jun Tang, Piotr Lubicki
    Abstract:

    With the sustainable growth in the number of new power plants and scale of transmission systems, the probability of the current exceeding the Short-Circuit Rating of Circuit breakers increases. A fault current limiter (FCL), which can be used to reduce current surges, has attracted considerable attention from utilities. However, the appropriate placement of FCLs in a power system for obtaining the most effective cost-to-benefit solution is crucial. This paper proposes a two-stage placement approach, where Stage I combines the hierarchical fuzzy logic decision (HFLD) method and Hashing-integrated generic algorithm (HIGA). The HFLD method is used for sorting feasible solutions, and the HIGA determines an optimal FCL placement in the reduced search space. Particle swarm optimization is then employed in Stage II for optimizing the FCL parameters. To verify the effectiveness of the proposed approach in solving the optimal FCL placement problem, the method is verified using the IEEE 30-bus system and system of a manufacturing factory in Taiwan. The numerical results show that the proposed method achieves a favorable solution in a Short time with fewer placements of FCLs.

G. Tulasi Ramdas - One of the best experts on this subject based on the ideXlab platform.

  • SVPWM BASED 3-LEVEL STATCOM FOR REACTIVE POWER MANAGEMENT UNDER LINE-LINE FAULT IN A TRANSMISSION LINE
    2013
    Co-Authors: G. Tulasi Ramdas
    Abstract:

    A fault in the power transmission system results in the failure of electrical equipment either due to insulation failure or end of current flow due to open Circuit. Although manufacturers carefully design the Short Circuit Rating of the power system equipment, in order to safely withstand the sudden passage of high current for a specified duration, it has been continuous challenging issue to pre estimate the severity of fault. At the same time, fast retrieving of the steady state and transient stability is also an important issue. The immediate effect of a fault is severe voltage sag, which remains a negative impact on the transmission system voltage stability leading to mismanagement of reactive power. So, there is every need to pre analyze the severity of the fault with respect to its precise location and its consequence under different loading considerations. A special requirement for the fast recovery of normal voltage is obtained from Flexible Alternating Current Transmission Systems (FACTS) technology. The full compensating current for the reactive power management under low voltages are met through Static Synchronous Compensator (STATCOM) from FACTS family. In this paper the authors concentrated on the complete analysis of Line-Line fault occurred in the standard IEEE 14 bus system. This fault analysis and evaluation module reduces down time of the transmission or distribution lines and supports the quick restoration of power. To achieve the satisfactory performance during steady state and transient operation of power system, advanced controllers like space vector pulse width modulation (SVPWM) techniques are implemented. Also the dynamic response of the 2-level SVPWM controlled STATCOM and 3-level SVPWM controlled multilevel STATCOM and their impact on the