Abstract: A system for preventing ground fault in a three-phase electric transmission line system caused by a line break, includes: the transmission lines, a programmable relay protection system, including a plurality of existing low sensitivity (LS) relays and a corresponding set of high sensitivity (HS) relays in parallel with the is relays.

Abstract: A method for controlling a solid state circuit breaker includes detecting a direction of a current flowing through the solid state circuit breaker, obtaining a breaking current value of the solid state circuit breaker according to the detected direction of the current, obtaining a value of a maximum threshold current to flow through the solid state circuit breaker, obtaining a predicted current value within a next sampling period of a present sampling period of the solid state circuit breaker, comparing the predicted current value with the breaking current value, and upon the predicted current value being greater than the breaking current value, delaying the solid state circuit breaker, and upon the predicted current value being greater than the maximum threshold current value, controlling the solid state circuit breaker to disconnect a circuit in which the solid state circuit breaker resides.

Abstract: A method includes detecting an initial fault in a system and opening a contactor to isolate a load bus from the system for a window of time. During the window of time, the method includes detecting whether current flows from a generator of the system. If current flows from the generator of the system during the window of time, the method includes isolating the load bus from the generator. If current does not flow from the generator to the system during the window of time, the method includes isolating the load bus from all sources including the generator.

Abstract: A negative sequence voltage (NSV) protection system is provided that can be added to existing equipment or included as a standalone device for detecting GFOV in electrical configurations connecting distributed energy resources to utility grids. The NSV protection system can be implemented at the low side of a distribution transformer of a typical distribution circuit or in a control system of inverter-based energy resources connected to a distribution feeder. The NSV protection system includes a passive monitoring system that outputs a trip signal when a potential GFOV is detected to occur. The trip signal can then be relayed to open the circuit breakers of a distribution circuit or to cause an inverter-based energy resource to trip offline.

Abstract: A flexible circuit breaker includes at least two semiconductor switches, at least one input and at least two outputs. Each of the at least two semiconductor switches can carry a defined current, and each of the at least two semiconductor switches is monitored individually in relation to the current flowing therethrough, the first output is assigned to a first semiconductor switch, where by a selection using a selection device on the flexible circuit breaker, one can select whether the current flowing through a second semiconductor switch is assigned to the second output or the first output.

Abstract: Various embodiments disclosed herein provide techniques for detecting electrical arcing in an electrical system. A powerline communications (PLC) application executing on a network communications device acquires, via a PLC modem, first voltage readings associated with an electrical circuit. The PLC application performs one or more operations based on the first voltage readings to determine that an electrical arcing condition is present within the electrical circuit. The PLC application performs a remedial operation in response to determining that the electrical arcing condition is present.

Abstract: The present disclosure provides a protection assistance device of multiple circuit breakers in a low-voltage system, in which protection assistance in both directions from the upper side to the lower side or from the lower side to the upper side is possible, and the number of wires for protection assistance between multiple upper/lower circuit breakers can be minimized. The protection assistance device includes at least one upper low-voltage circuit breaker; at least one middle low-voltage circuit breaker; at least one lower low-voltage circuit breaker; and a communication line which makes a communication connection between the low-voltage circuit breakers, wherein the low-voltage circuit breakers comprise a control unit for, when a trip operation of automatically breaking a circuit is performed, transmitting a communication packet for reporting a trip operation state to at least one predetermined circuit breaker among the circuit breakers through the communication line.

Abstract: Various examples are provided related to diode clamped solid-state circuit breakers (SSCBs). Their configuration allows operation of the SSCB without dynamic voltage balancing issues. In one example, a diode clamped SSCB includes source-side switches and line-side switches connected between a DC source connection and a line-side connection. Clamping capacitors are connected at a common connection point between the source-side and line side switches and source-side and line-side clamping diodes are connected between the source-side switches and line-side switches and the clamping capacitors. Sequential switching of the source-side switches or line-side switches can avoid dynamic voltage balancing issues.

Abstract: A method of distributing electrical power in an electricity grid comprising an electrical distributor circuit having at least three terminals, wherein sources and sinks for electrical energy can be connected to the terminals, and wherein the three terminals are electrically connected together in such a way that an electric current can flow from each of the terminals to each of the other terminals. Each of the terminals has a respective power controller which is so adapted that in operation of the power distributor the electric power P(t) flowing by way of the respective terminal can be adjusted in dependence on time t. The control means is connected to each of the power controllers, and it calculates the electric power P(t) flowing by way of each of the terminals in dependence on the data received from the sources or sinks.

Abstract: A low-voltage circuit breaker includes: at least one external conductor section from an external conductor power terminal of the low-voltage circuit breaker to an external conductor load terminal of the low-voltage circuit breaker; a neutral conductor section from a neutral conductor terminal of the low-voltage circuit breaker to a neutral conductor load terminal of the low-voltage circuit breaker; a mechanical bypass switch arranged in the external conductor section; a semiconductor circuit arrangement switched in parallel to the bypass switch; an electronic control unit; and a first current measuring arrangement arranged in the external conductor section, the first current measuring arrangement including a first shunt, which is connected to the electronic control unit. The electronic control unit actuates the mechanical bypass switch and the semiconductor circuit arrangement upon detecting a prespecifiable overcurrent that includes a short circuit current, by the current measuring arrangement.

Abstract: A device for monitoring the activity of at least one first and one second processing unit fitted to an electric trip unit, each processing unit including a first activity-indicating circuit sending an activity signal to another processing unit and a monitoring circuit comparing a received activity signal with a reference signal. Each processing unit activates a first tripping circuit and/or an auxiliary output when the received activity signal is different from the reference signal. A circuit-breaker including such a monitoring device and a method for monitoring the operation of an electric trip unit including at least two processing units.

Abstract: A method of operating an electrical power distribution system including circuit protection devices is disclosed. Each circuit protection device includes a network interface, a processor, and a memory device. The method includes transmitting, by each device of the plurality of circuit protection devices, a network communication signal to the communication network. An approximate physical distance between the circuit protection devices is determined based at least in part on a characteristic of the network communication signals. A maintenance mode of each circuit protection device of a subset of the circuit protection devices is enabled in response to enablement of a maintenance mode of one circuit protection device of the plurality of circuit protection devices. The subset of the circuit protection devices is determined at least in part by the approximate physical distance of the circuit protection devices from the maintenance mode enabled one circuit protection device.

Abstract: According to one configuration, a redundant power supply includes a first power supply and a second power supply that collectively provide power to a (circuit) load during a non-test mode. During a power supply test mode, controller hardware in communication with the redundant power supply selects the first power supply for testing. The controller hardware disables failure reporting of the second power supply and then deactivates the second power supply. The controller hardware tests an ability of the first power supply to power the load while the second power supply is prevented from powering the load. If the first power supply is unable to individually power the load, the controller hardware provides notification to a respective target recipient to go forward with replacing and/or fixing the first power supply.

Abstract: A method and apparatus for identifying an open phase of a circuit breaker on the basis of voltage. The method comprises: a protection apparatus measures three-phase voltages at two sides of a circuit breaker; respectively calculates a vector difference and an effective value of the voltages at two sides of the circuit breaker; when the phase voltages at two sides are both greater than 80% to 90% of a rated voltage, and the voltage vector difference at two sides of the one-phase or two-phase circuit breaker is greater than a set voltage, it is determined that the circuit breaker has an open phase; and actuates an alarming or tripping operation after a short time delay t.

Abstract: Aspects of the subject disclosure may include, for example, a system for receiving telemetry information from an apparatus that induces electromagnetic waves on a wire surface of a wire of a power grid for delivery of communication signals to a recipient communication device coupled to the power grid, and detecting a condition from the telemetry information that is adverse to a delivery of the communication signals to the recipient communication device. Other embodiments are disclosed.

Abstract: An apparatus (100) and method are provided for translating diagnostic information provided by a circuit protective device, such as a circuit breaker, to a graphic display format. The apparatus and method monitor through a sensor (120) a trip sequence implemented by the circuit protective device as a function of time during a read out operation to indicate a type of fault condition from a plurality of fault conditions for a prior occurrence of a trip event or diagnostic information. The apparatus and method then determine a time period of the monitored trip sequence, and determine the type of fault condition based on the determined time period. Information concerning the determined type of fault condition is outputted.

Abstract: Apparatus and methods are provided for handling the heating resulting from the operation of a self-powered power sensor (SPPS). The SPPS periodically switches between a sense mode and a harvest mode, each contributing to power dissipation that translates into heat, which may become a safety hazard. A duty cycle that is the ratio between the period in which sensing take place and the total time elapsed between sensing periods defines the duty cycle of the SPPS. In order to prevent overheating of the SPPS it is configured to provide a dynamic duty cycle that is higher for lower currents in the primary power wire and lower, for higher primary currents. This allows for better power dissipation of the SPPS and removing it from operation in unfavorable or dangerous conditions.

Abstract: A protection feature is disclosed for a self powered protection relay having, for example, sensitive earth fault protection. Protection can be achieved in tandem with optimal power on trip time and with integrated logic for inrush discrimination. The self supplied protection relay can include a current processing module to measure and evaluate line current to generate a trip signal, and to suppress inrush current to block earth fault detection during an inrush condition and thereby increase sensitivity of fault detection.

Abstract: A leakage current detector for an electricity supply comprising a plurality of supply conductors supplying a load, the leakage detector comprising a connection from each supply conductor to a common conductor, a circuit for detecting a differential current flowing in the connections, and a circuit arranged to provide an output signal when the differential current reaches a predetermined magnitude.

Abstract: Disclosed herein are systems and methods for leveraging the inherent redundancy of electrical measurement inputs available to microprocessor-based intelligent electronic devices (IEDs). Specifically, an IED may receive a plurality of electrical measurements associated with an electric power delivery system, such as measurements associated with a generator. A first protection module may be configured to detect a first type of electrical disturbance using a first subset of the plurality of electrical measurements. A second protection module may be configured to detect a second type of electrical disturbance using a second subset of the plurality of electrical measurements. A first redundant protection module may be configured to verify the detection of the first type of electrical disturbance using at least a portion of the second subset of the plurality of electrical measurements.

Abstract: A distributed energy resources control apparatus for controlling power from a distributed energy resource in a system section separable from a power system includes a detecting unit, a receiving unit, and a control unit. The detecting unit detects a fault of the power system. The receiving unit receives a signal indicating authorization for the distributed energy resource to perform independent operation as linking with the system section, when the system section is separated from the power system. The control unit controls a power converter converting power from the distributed energy resource and outputting to the system section, based on measurement results of a voltage and a frequency of the system section, when the fault is detected and the signal is received.

Abstract: A power distribution system comprises a power supply, a plurality of loads connected to one of the power supply and ground and a plurality of pulse generators, each pulse generator connected to each of the plurality of loads, configured to generate pulses to connect the plurality of loads to the other one of the power supply and ground at predetermined frequencies.

Abstract: A circuit breaker is disclosed. A Rogowski converter is checked for wire breakage by applying a voltage to the Rogowski converter which is output by a digital/analog converter in response to a digital signal. The digital signal is dependent on the switch rated current of the circuit breaker.

Abstract: A system includes a refrigerant compressor including an electric motor, a current sensor that measures current flow to the electric motor, a switching device configured to close and open to allow and prevent current flow to the electric motor, respectively, a maximum continuous current (MCC) device that includes a resistance corresponding to a maximum continuous current for the electric motor, and a motor protection module. The motor protection module communicates with the MCC device, the current sensor, and the switching device and determines a first MCC value for the electric motor as a function of the resistance of the MCC device. The motor protection module also selectively sets a predetermined MCC to the first MCC and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.

Abstract: A current differential protection system for a multi-terminal power line includes a current sensor for sensing a current at a local terminal, a controller for time synchronizing the local terminal and remote terminals, and a fault detection module to detect a fault in the multi-terminal power line if a differential current exceeds a threshold value. The controller includes a time measurement exchange module for exchanging time stamp data with remote terminals, an upper range clock for exchanging time stamp data with remote terminals and a lower range clock for indexing the current at the local terminal. A first time period of the upper range clock is N times a second time period of the lower range clock where N is a number of multi-terminals. The controller includes a clock offset calculation module for determining an average time offset based on time stamp data from remote terminals and the local terminal.

Abstract: A power management and distribution system includes a source block having a power distribution line, wherein the power distribution line includes a distribution switch. At least one load block is in operable communication with the power distribution line and having a plurality of load block power output lines, wherein each of the plurality of load block power output lines includes a load switch. Further included is a plurality of loads each carried power by at least one of the plurality of load block power output lines. Yet further included is a protection logic unit comprising at least one algorithm for comparing a power characteristic to a power characteristic threshold at a plurality of locations, wherein the protection logic unit selectively determines which of the source block switches, distribution switches and the load switches of the plurality of load block power output lines are opened based on at least one comparison.

Abstract: An autonomous breaker can apply a current through a high impedance source to a bus coupled to either end of a breaker in order to measure an impedance of the bus. The status of the bus can be determined from the measurement. Based on the determined status, a fault detection procedure can be selected and implemented to determine if a fault exists on the bus. When the fault detection procedure has been implemented and no fault has been detected, the breaker can close, and thus couple the bus to another bus.

Abstract: A protection element for a meshed energy supply network of a means of transport, in particular of an aircraft, a meshed energy supply network having such protection elements, a method for protecting such a meshed energy supply network and a computer program for executing the method. The protection element comprises a control unit, which is formed to deduce a trigger time value from a detected fault impedance value of a network error that has occurred in the energy supply network and to adapt the trigger time value in the event of a subsequent change in the fault impedance value of the network error, and a separation unit for interrupting a connection between the protection element and the network error depending on the trigger time value.

Abstract: A power distribution system (that can detect an unsafe fault condition where an individual or object has come in contact with the power conductors) regulates the transfer of energy from a source to a load. Periodically, the source controller opens an S1 disconnect switch, a and load controller opens an S2 disconnect switch. A capacitor represents the capacitance across the load terminals. If the capacitor discharges at a rate higher or lower than predetermined values after the S1 and S2 disconnect switches are opened, then a fault condition is registered, and the S1 and S2 switches will not be commanded to return to a closed position, thus isolating the fault from both the source and the load.

Abstract: The present invention relates to a busbar differential protection method. For each bay, firstly, zero-crossing point of voltage is determined according to sample values of voltage, then the current values are re-sampled on a current fitting curve by using zero-crossing point of voltage as a synchronous signal according to a given sampling time period to get a sample sequence. The sample sequence is comprised of current values of sampling points and sample serial numbers. The sample serial numbers of sampling points at the same time are same for the sample sequence of respective interval. Finally, computing is done to sample sequences of respective intervals, and differential protection is achieved.

Abstract: A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.

Abstract: A method of controllably disconnecting a utility power service from a load includes generating in a metrology circuit of a meter metering information regarding electrical power provided to the load from the utility power service. The meter includes a service switch having a controller to controllably interrupt a connection between the utility power service and the load. The method also includes connecting an energy storage device to the controller responsive to a service disconnect command. The method further includes connecting at least a portion of the metrology circuit to the energy storage device and disconnecting a meter power supply from the portion of the metrology circuit responsive to a power interruption detection signal.

Abstract: Magnetic field current sensing devices, systems and methods are disclosed. In an embodiment, a current sensor includes a semiconductor die; an isolation layer disposed on the semiconductor die; at least one anchor pad disposed on the isolation layer; a current input and a current output galvanically isolated from the semiconductor die; at least one bond wire coupled to the current input and the current output, a longitudinal portion of the at least one bond wire disposed between the current input and the current output being stitched to the at least one anchor pad; and at least one sensor element arranged to sense a magnetic field induced by a current flowing in the at least one bond wire.

Abstract: A directional fault location and isolation system for a three phase electric power circuit that identifies a faulted segment by determining the direction of the fault at multiple tap points in the electric power circuit. The directional fault controller, which may be a centralized controller or a number of peer-to-peer controllers located at the tap points, includes communication equipment for exchanging information with the monitoring equipment and the sectionalizing equipment at each sectionalizing control point, which includes the tap points and may also include the substations. The controller also includes processing equipment that determines the directionality of a fault on the power line at each current monitoring device, identifies a faulted line section by identifying a change in the directionality of the fault associated with the faulted line section, and operates one or more of the sectionalizing switches to isolate the faulted line section from the circuit.

Abstract: A circuit breaker includes several elementary circuit breakers (1) arranged as several segments (2), each suitable for powering several independent loads (3). These provisions make it possible to improve the thermal equilibrium on each segment by distributing the heating over all the segments. The segmental circuit breakers are more particularly suitable for multi-wire networks which power a single load through a multitude of wires of the network in parallel.

Abstract: A power management and distribution system includes a source block having a power distribution line, wherein the power distribution line includes a distribution switch. At least one load block is in operable communication with the power distribution line and having a plurality of load block power output lines, wherein each of the plurality of load block power output lines includes a load switch. Further included is a plurality of loads each carried power by at least one of the plurality of load block power output lines. Yet further included is a protection logic unit comprising at least one algorithm for comparing a power characteristic to a power characteristic threshold at a plurality of locations, wherein the protection logic unit selectively determines which of the source block switches, distribution switches and the load switches of the plurality of load block power output lines are opened based on at least one comparison.

Abstract: A circuit protection system for a power panel is disclosed. The circuit protection system includes a transistor connected in a channel of a power panel, the transistor connected between return connections of a load and a return path, and the power panel including a plurality of channels connected to the load. The circuit protection system also includes control circuitry electrically connected in parallel with the transistor, the control circuitry configured to selectively activate the transistor to allow current to pass through the transistor based on an observed voltage across the transistor.

Abstract: The present invention relates to a busbar differential protection method. For each bay, firstly, zero-crossing point of voltage is determined according to sample values of voltage, then the current values are re-sampled on a current fitting curve by using zero-crossing point of voltage as a synchronous signal according to a given sampling time period to get a sample sequence. The sample sequence is comprised of current values of sampling points and sample serial numbers. The sample serial numbers of sampling points at the same time are same for the sample sequence of respective interval. Finally, computing is done to sample sequences of respective intervals, and differential protection is achieved.

Abstract: The present disclosure is concerned with controlling distributing of electrical power in a power distribution region. To effectively control the distribution of power in the distribution region, the substation of the region is provided with a distribution controller or Intelligent Substation Control System (ISCS). The distribution controller is connected to various process devices, which in turn are connected to primary devices of the region. The process devices send data corresponding to the primary devices to the distribution controller, and the distribution controller includes a processor which proposes a set of actions based on the received data. Further, the distribution controller includes a coordinating device which selects the final action from the set of proposed actions. The final action is implemented on the primary devices of the distribution region.

Abstract: A power distribution system for a dynamically positioned vessel may include: a plurality of busses including a first bus to which a load is connectable; a plurality of switches including a first switch and a second switch, wherein the plurality of busses is connected via the switches in a interjacent manner to form a ring, the first bus is connected between the first switch and the second switch, and the power distribution system is configured to concurrently open the first switch and second switches, if a first current flowing via the first switch towards the first bus is above a predetermined current threshold for longer than a predetermined time and a second current flowing via the second switch towards the first bus is above the predetermined current threshold for longer than the predetermined time, thereby disconnecting the first bus from the ring while all other buses remain connected together.

Abstract: An appliance and a method are intended to monitor a phase line of a section of an electrical energy grid line. The appliance comprises a device for monitoring a parameter of a phase line. The parameter is representative of routine operating conditions of the phase line and has a known propagation speed. The appliance also comprises a device for generating an event detection signal each time the parameter has a value that exceeds a threshold, and for storing a reception time when the detection signal is generated. The appliance also has a device for sending a signal representative of a geographic location of the end of the section and a device for performing a geographic location of the event once two consecutive detection signals are generated from the signal representative of the geographic location, and reception times associated with the two detection signals.

Abstract: A surge current detection device 30 is detachably attached to a conductor 11 and detects a surge current entering the conductor 11. The surge current detection device 30 includes: a holder 40 releasably holding the conductor 11 via first and second holder bodies 40-1 and 40-2 facing each other; a magnetic force concentrating member 60 having a substantially U-shaped cross-section, the magnetic force concentrating member 60 being secured inside the holder 40 and concentrating a magnetic flux included in a magnetic field generated by the surge current entering the magnetic flux conductor 11 to a high density at a predetermined detection region; and a magnetic material sheet 70 secured inside the holder 40 in such a manner that the magnetic material sheet 70 is positioned at the detection region, the magnetic material sheet 70 detecting the surge current.

Abstract: An arrangement for controllably disconnecting a utility power service from a load includes a utility meter housing, a service switch, an energy storage device and a control circuit. The utility meter housing includes metrology circuitry configured to generate metering information regarding electrical power provided to the load. The service switch is configured to controllably interrupt a connection between the utility power service and the load, and has a controller. The control circuit is configured to cause the energy storage device to be connected to the controller responsive to a service disconnect command. The control circuit is further configured to cause a portion of the metrology circuit to be connected to the energy storage device and the meter power supply to be disconnected from the portion of the metrology circuit responsive to a power interruption detection signal.

Abstract: A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.

Abstract: A distribution and power transformer has its primary connected to the high voltage bus of the network and its secondary connected to a switching device. Upon the occurrence of a condition known to cause a dynamic overvoltage (DOV) and the occurrence of the DOV, a control system causes the switching device to change from a nonconductive mode to a conductive mode in less than the time for one cycle of the operating frequency of the AC network. This change in switching device conduction places a short circuit across the transformer secondary and thus mitigates the DOV.

Abstract: An adaptive relaying control system and method is disclosed for adapting coordination of protective measures provided to an electric-energy distribution system as a function of at least an ambient weather condition. A weather sensor senses the ambient weather condition within a region adjacent to at least a portion of the electric-energy distribution system. A control unit is operatively coupled to the weather sensor to receive a weather signal indicative of the ambient weather condition and determine whether a storm condition exists based at least in part on the weather signal. The control unit establishes a suitable control philosophy for adapting coordination of the protective measures provided to the electric-energy distribution system based at least in part on whether the storm condition exists.

Abstract: A protection element (e.g., an arrester) protects a piece of equipment to be protected, from surge currents line terminals and an earth terminal. Surge current detection devices are provided on respective conductors connected to the arrester. Each of the surge current detection devices is to detect the surge current penetrated into a conductor for a short period of time, and includes a magnetic flux concentration member by which a magnetic flux produced by the penetrated surge current is concentrated in a given detection area at a high density, and a ferromagnetic material sheet positioned on the given detection area. The ferromagnetic material sheet includes a recording layer which is able to record and erase the penetration state of the surge current. A plurality of microcapsules are arranged in the recording layer, and each of the microcapsules contains a suitable liquid, and a plurality of magnetic particles suspended in the suitable liquid.

Abstract: A power distribution and communication system includes nodes connected by power lines and communication links. The system receives power from one or more power sources. Each node contains at least one power port, data port and load port. Associated with each power port and load port is a port monitor for measuring current flowing into or out of the port and the voltage difference between the port outlet and ground, which measurements are passed to a processing element. The processing element and monitor analyze measured values to detect fault conditions. Upon fault condition detection, the port is disabled by opening a switch, disconnecting the port from the system voltage. The processing element receives power directly from the power line, thus receiving power from a live power line even if the associated power port is disabled allowing the processing element to enable a disabled node following a failure.

Abstract: A circuit breaker is disclosed. A Rogowski converter is checked for wire breakage by applying the Rogowski converter with a voltage which is output by a digital/analog converter in response to a digital signal. The digital signal is dependent on the switch rated current of the circuit breaker.

Abstract: Methods of providing arc resistant switchgear enclosures for dry-type transformers are provided. The enclosures have one or more arc-resistant features, including arc channels, arc fault dampers, and arc fault plenums. In a preferred embodiment, the method comprises providing a base structure with a dry-type transformer seated thereon, providing walls and a roof, wherein at least the front wall contains at least one longitudinal seam covered by an arc channel.