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Proceedings ArticleDOI

High-speed AC circuit breaker and high-speed OCR

TL;DR: A prototype AC high speed circuit breaker which could interrupt the short circuit current of 12.5kA, 25.8kV within 1 cycle of 60Hz is proposed and a prototype over current relay(OCR) which can send a trip signal within 1/2 cycle of60Hz is developed.
Abstract: In electrical power systems, especially highly networked and become smart grid recently, faster protection relay and faster circuit breaker are more desirable for system stability at short circuit accidents. Nowadays general interruption time of circuit breaker is 3~5 cycle and trip signal sending time of a protection relay is about 2 cycle for instant operation. Most cases these circuit breaker and protection relay are sufficient for protection of the power systems but some special cases faster circuit breaker and relay are required. We proposed a prototype AC high speed circuit breaker which could interrupt the short circuit current of 12.5kA, 25.8kV within 1 cycle of 60Hz. Also we developed a prototype over current relay(OCR) which can send a trip signal within 1/2 cycle of 60Hz. We carried out a short circuit test these high speed circuit breaker and OCR in combination. At making current of maximum DC components defined in IEC 62271 100 32.5kA peak, 25.8kV, current was sensed and interrupted within 1 cycle. (4 pages)

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Citations
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Journal ArticleDOI
TL;DR: A compact, efficient and dc fault-tolerant hybrid series converter (HSC) topology is proposed in this article for high-voltage direct current (HVdc) applications and its performance is compared with the prominent converter topologies.
Abstract: A compact, efficient and dc fault-tolerant hybrid series converter (HSC) topology is proposed in this article for high-voltage direct current (HVdc) applications. It contains a parallel and a series chain link (CL) per phase. The parallel CL (PCL) supports the dc-link, whereas the series CL (SCL) enables the HSC to have enhanced operating range and dc fault-tolerant capabilities. A new control technique is proposed to control the SCL submodules (SMs) capacitor voltage for its entire operating range. The performance of HSC and its control technique is evaluated using PSCAD/EMTDC for various conditions. The capability of HSC to work in the undermodulation and overmodulation index range and for HVdc system is examined. Furthermore, the response of HSC during pole-to-pole dc fault and ac faults is analyzed to substantiate its dc fault blocking and ac fault ride-through capabilities. The results obtained validate that the HSC exhibits superior performance over the existing ones. The SMs’ capacitor size design methodology in HSC and for other existing topologies is described. The loss calculation of the HSC is carried out to determine its efficiency and is compared with the prominent converter topologies. A three-phase 13-level HSC experimental setup is developed to validate its feasibility and also to reconfirm the simulation outcomes.

20 citations


Cites methods from "High-speed AC circuit breaker and h..."

  • ...1 s (typical operating time of an ac circuit breaker [37]) in a gridconnected converter simulation model with the parameters listed in Table III....

    [...]

Journal ArticleDOI
01 Jan 2020-Energies
TL;DR: In this article, the authors focus on the potential application of the IEC 61850 generic object-oriented substation event (GOOSE) protocol in the AC microgrid for adaptive protection.
Abstract: The IEC 61850 communication standard is getting popular for application in electric power substation automation. This paper focuses on the potential application of the IEC 61850 generic object-oriented substation event (GOOSE) protocol in the AC microgrid for adaptive protection. The focus of the paper is to utilize the existing low-voltage ride through characteristic of distributed generators (DGs) with a reactive power supply during faults and communication between intelligent electronic devices (IEDs) at different locations for adaptive overcurrent protection. The adaptive overcurrent IEDs detect the faults with two different preplanned settings groups: lower settings for the islanded mode and higher settings for the grid-connected mode considering limited fault contributions from the converter-based DGs. Setting groups are changed to lower values quickly using the circuit breaker status signal (XCBR) after loss-of-mains, loss-of-DG or islanding is detected. The methods of fault detection and isolation for two different kinds of communication-based IEDs (adaptive/nonadaptive) are explained for three-phase faults at two different locations. The communication-based IEDs take decisions in a decentralized manner, using information about the circuit breaker status, fault detection and current magnitude comparison signals obtained from other IEDs. However, the developed algorithm can also be implemented with the centralized system. An adaptive overcurrent protection algorithm was evaluated with PSCAD (Power Systems Computer Aided Design) simulations, and results were found to be effective for the considered fault cases.

15 citations

Proceedings ArticleDOI
01 Oct 2015
TL;DR: In this article, the analysis of Thomson coil actuator and the dynamic characteristics is presented, which is necessary to the fast switch of HVDC circuit breaker, and experiments are performed for the prototypes with simple contacts and a vacuum interrupter.
Abstract: In this paper, the analysis is performed on Thomson coil actuator and the dynamic characteristics is presented, which is necessary to the fast switch of HVDC circuit breaker. For analysis, electromagnetic and dynamic equations are simultaneously solved using commercial code. Whole geometry with a drive coil is simplified and applied to analysis by considering the cylindrical shape of the actuator for simulation. In calculation of current flowing through the coil as the component of electric power circuit for operation of the actuator, the resistance and the inductance are taken into account, including stray component. The calculated current is used to predict the repulsive force on the plate, and the stroke of the actuator is deduced from solving the dynamic equation by considering the forces by spring and the gravity besides friction. Through simulation, dynamic variables are calculated such as inductance of a drive coil, force on a repulsive plate, and so on. Also, flux lines, induced current density, and magnetic flux density are predicted to time. In order to confirm the simulation results, experiments are performed for the prototypes with simple contacts and a vacuum interrupter, which is designed for fast switch. Experimental results are compared with simulation and the characteristics are discussed.

12 citations

Patent
10 Dec 2015
TL;DR: In this paper, an HVDC circuit breaker unit with an interrupter branch extending between a first node (3) and a second node (4) comprising a vacuum interrupters (5) connected to the first node and a gas interruptorus (6) connecting to the second node is described.
Abstract: An HVDC circuit breaker unit (1) with an interrupter branch (2) extending between a first node (3) and a second node (4) comprising a vacuum interrupter (5) connected to the first node (3), and a gas interrupter (6) connected to the second node (4) of the circuit breaker unit. The vacuum interrupter (5) is connected to the circuit breaker unit (1) at a third node (7) such that the gas interrupter (6) is electrically connected in series to the vacuum interrupter (5). A first movable contact member (11) of the vacuum interrupter (5) and a second movable contact member (12) of the gas interrupter (6) are operatable by at least one Thomson coil drive. An arrestor branch (8) comprising a first non-linear resistor (9)is connected to the first node (3) and the second node (4).

11 citations

13 Oct 2020
TL;DR: The existing low-voltage ride through characteristic of distributed generators with a reactive power supply during faults and communication between intelligent electronic devices (IEDs) at different locations for adaptive overcurrent protection is utilized.
Abstract: The IEC 61850 communication standard is getting popular for application in electric power substation automation. This paper focuses on the potential application of the IEC 61850 generic object-oriented substation event (GOOSE) protocol in the AC microgrid for adaptive protection. The focus of the paper is to utilize the existing low-voltage ride through characteristic of distributed generators (DGs) with a reactive power supply during faults and communication between intelligent electronic devices (IEDs) at different locations for adaptive overcurrent protection. The adaptive overcurrent IEDs detect the faults with two different preplanned settings groups: lower settings for the islanded mode and higher settings for the grid-connected mode considering limited fault contributions from the converter-based DGs. Setting groups are changed to lower values quickly using the circuit breaker status signal (XCBR) after loss-of-mains, loss-of-DG or islanding is detected. The methods of fault detection and isolation for two different kinds of communication-based IEDs (adaptive/nonadaptive) are explained for three-phase faults at two different locations. The communication-based IEDs take decisions in a decentralized manner, using information about the circuit breaker status, fault detection and current magnitude comparison signals obtained from other IEDs. However, the developed algorithm can also be implemented with the centralized system. An adaptive overcurrent protection algorithm was evaluated with PSCAD (Power Systems Computer Aided Design) simulations, and results were found to be effective for the considered fault cases.

8 citations


Cites background from "High-speed AC circuit breaker and h..."

  • ...This means high-speed AC circuit breakers operating in one cycle [43] will be required for the implementation of the proposed adaptive OC protection scheme....

    [...]

References
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Proceedings ArticleDOI
07 Aug 2002
TL;DR: In this article, the authors presented a significantly improved and simplified approach that replaces the semiconductors with ultra-fast switching elements for fault-current limiting circuit breakers (FCLCB).
Abstract: In the past many uneconomic solutions for fault current limiting circuit breakers (FCLCB) have been introduced. Among them, a promising hybrid system has been published, wherein a combination of fast switches, power semiconductors and a resistor forms a very effective FCLCB. This paper presents a significantly improved and simplified approach that replaces the semiconductors with ultra-fast switching elements. Laboratory tests and computer simulations verify the feasibility of this approach. Its elegance lies in the simplicity of the switches and in the improved use of the characteristics of the switching arc over many series breaks, namely cathode-fall and instantaneous recovery. In addition, an ultra-high speed repulsion drive provides an extremely short breaking time (a few 100 microseconds) and the contact separation scatter is within microseconds. These features are the basis for a completely new approach to creating medium-voltage switchgear, and are particularly suited for fault-current limitation.

50 citations

Journal ArticleDOI
TL;DR: In this article, the authors constructed and tested a model superconducting fault current limiter (SFCL) using a high-temperature superconding film according to a design that includes a vacuum interrupter with an electromagnetic repulsion mechanism.
Abstract: The authors constructed and tested a model superconducting fault current limiter (SFCL) using a high-temperature superconducting film according to a design that includes a vacuum interrupter with an electromagnetic repulsion mechanism. The superconductor and the vacuum interrupter are connected in parallel with a bypass coil. If a fault occurs and current flows through the system, the superconductor is quenched and the current is transferred to the parallel coil because of the voltage drop in the superconductor. This large current in the parallel coil actuates the magnetic repulsion mechanism of the vacuum interrupter. On opening the vacuum interrupter, the current in the superconductor is interrupted. This model is expected to exhibit very low-energy consumption by the superconductor. The authors succeeded in interrupting the current flowing in the superconductor within a half-cycle using a prototype SFCL. An improved SFCL with higher voltage and current ranges was used to carry out current-limiting tests and to investigate the possibility of adapting our SFCL in a power system. The authors also carried out a current-limiting test using a conventional high-speed vacuum circuit breaker (HSVCB) as a new method for realising our concept.

32 citations

Proceedings ArticleDOI
09 Nov 2010
TL;DR: In this article, the fundamental phenomena of the high-speed vacuum circuit breaker, which forced the fault current to zero, for the DC power system were investigated by the experiments, and the results demonstrate the interruption characteristics and the arc behaviors of high speed vacuum circuit breakers were applied for DC1500V and DC750V power systems of railway.
Abstract: The fundamental phenomena of the high-speed vacuum circuit breaker, which forced the fault current to zero, for the DC power system were investigated by the experiments. The interruption characteristics of the circuit breaker, which was consisted from a vacuum interrupter, a high frequency current source and a high-speed driving mechanism, were estimated experimentally. The arcing period of the high-speed vacuum circuit breaker is much shorter than that of conventional circuit breaker. The arc behavior of the test electrodes immediately after the electrode separation was observed by a high-speed video camera. The relation between the current waveform just before current zero and the interruption ability by varying the high frequency current source was investigated. The results demonstrate the interruption characteristics and the arc behaviors of the high-speed vacuum circuit breaker. And the high-speed vacuum circuit breakers were applied for DC1500V and DC750V power systems of railway.

26 citations

Proceedings ArticleDOI
18 Nov 2008
TL;DR: In this article, a novel vacuum circuit breaker with high-speed repulsion actuator is designed, where, the characteristics of high speed repulsion actuator are analyzed with finite element method (FEM) through changing design parameters of repulsive actuator, and good trends for generating bigger force are given.
Abstract: The high-speed operation switchgears are required by more and more situations in power system, such as high-speed DC circuit breaker and some power-transfer locations. In this paper, a novel vacuum circuit breaker with high-speed repulsion actuator is designed, where, the characteristics of high-speed repulsion actuator are analyzed with finite element method (FEM) through changing design parameters of repulsion actuator, and good trends for generating bigger force are given. The performance comparisons with permanent magnetic actuator (PMA) are also given in this paper, experiments shows that vacuum circuit breaker (VCB) based on high-speed repulsion actuator can present good operate performance than PMA.

11 citations