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When voltage across/within a circuit is raised beyond the design limit
In electrical engineering, overvoltage is the raising of voltage beyond the design limit of a circuit or circuit element. The conditions may be hazardous
Overvoltage
Protects electrical devices from voltage spikes
characteristic of a TVS requires that it respond to overvoltages faster than other common overvoltage protection components such as varistors or gas discharge
Surge_protector
Short duration voltage transient in an electrical circuit
in an electrical circuit. Fast, short duration electrical transients (overvoltages) in the electric potential of a circuit are typically caused by Lightning
Voltage_spike
Device that routes electric current around a point in a circuit
circuit protection, shunt devices such as crowbar circuits guard against overvoltage by short-circuiting the supply. Capacitors are employed as shunts to
Shunt_(electrical)
System of identifying electrical power devices
Relay 59 - Overvoltage Relay 59B - Bank Phase Overvoltage 59N - Neutral Overvoltage 59NU - Neutral Voltage Unbalance 59P - Phase Overvoltage 59X - Auxiliary
ANSI_device_numbers
Device that damages hardware by sending high voltage into USB ports
for protection from power surges and electrostatic discharge. Various overvoltage protection devices may be employed to make lines more resistant to high
USB_killer
Type of electrical circuit
A crowbar circuit is an electrical circuit used for preventing an overvoltage or surge condition of an AC power supply unit from damaging the circuits
Crowbar_(circuit)
Power outage in Spain and Portugal
Spain increased drastically, and consequently also in Portugal. The overvoltage triggered a cascade of generation losses that caused a drop in the frequency
2025 Iberian Peninsula blackout
2025_Iberian_Peninsula_blackout
The subcycle overvoltage condition describes the electrical generation fault mode that is associated with the inverter-based resources (IBR, like solar
Subcycle_overvoltage
Electrical device that uses batteries to prevent any interruption of power flow
correcting common utility power problems: Voltage spike or sustained overvoltage Momentary or sustained reduction in input voltage Voltage sag Noise,
Uninterruptible_power_supply
Device to trip a circuit breaker when a fault is detected
provide detection of abnormal operating conditions such as over-current, overvoltage, reverse power flow, over-frequency, and under-frequency. Microprocessor-based
Protective_relay
French electrical power and advanced materials company
Acquisition of ASP Specialists in overvoltage protection 2014 Majority stake in Cirprotec Specialists in lightning and overvoltage protection (SPD) 2011 Acquisition
Mersen
Diode that allows current to flow in the reverse direction at a specific voltage
stabilized power supplies. They are also used to protect circuits from overvoltage, especially electrostatic discharge. The device is named after American
Zener_diode
predefined limits. Voltage protection circuits protect circuitry from either overvoltage or undervoltage; either of these situations can have detrimental effects
Supervisory_circuit
Twin-aisle airliner family
had the same goal, Rosen writes. On January 20, the NTSB declared that overvoltage was not the cause of the Boston incident, as voltage did not exceed the
Boeing_787_Dreamliner
Switch using electrical contacts in a vacuum
contact life, rapid recovery of voltage withstand rating, and control of overvoltage due to current chopping. An external operating mechanism drives the moving
Vacuum_interrupter
an electronic component designed to protect electronic circuits from overvoltage. Unlike a transient voltage suppression diodes, such as Transil, Trisil
Trisil
Line of Intel microprocessors released in 2022
can be installed by updating the motherboard's BIOS. Once damaged by overvoltage, these CPUs cannot be fixed by a patch and must be replaced. Intel has
Raptor_Lake
optimisation due to the reduced losses in the motor. [citation needed] Overvoltage refers to voltage higher than the voltage at which equipment is designed
Voltage_optimisation
Terminal and associated equipment located at a subscriber's premises
and most private branch exchanges. Excluded from the CPE category are overvoltage protection equipment and pay telephones. Other types of materials that
Customer-premises_equipment
Electronic component
clamping device, suppressing all overvoltages above its breakdown voltage. It automatically resets when the overvoltage goes away, but absorbs much more
Transient-voltage-suppression diode
Transient-voltage-suppression_diode
Component of the electrical power system
air that is designed to flashover before the insulating surfaces do. Overvoltages on transmission lines, due to atmospheric electricity, lightning strikes
Arcing_horns
Material that does not conduct an electric current
To make defective units obvious, glass units are designed so that an overvoltage causes a puncture arc through the glass instead of a flashover. The glass
Insulator_(electricity)
Air disruption caused by an electric fault
UPS units to restore power to the ATMC, they triggered an inadvertent overvoltage, which damaged equipment in the center. Service was partially restored
2023 Philippine airspace closure
2023_Philippine_airspace_closure
Electrical breakdown of a gas that results in an ongoing electrical discharge
protect a unit (e. g., a series capacitor in a transmission line) against overvoltage, an arc-inducing device, so called spark gap, is connected in parallel
Electric_arc
Instrument for displaying time-varying signals
Overvoltage category Operating voltage (effective value of AC/DC to ground) Peak instantaneous voltage (repeated 20 times) Test resistor CAT I 600 V 2500 V
Oscilloscope
Type of solid-state switch
Switch: A high-commutation and overvoltage-protected TRIAC with gate buffer ACST: AC Switch: A high-commutation and overvoltage-protected TRIAC AGT: Anode
Thyristor
Device used to suppress some phenomenon
diodes are like silicon controlled rectifiers (SCRs) which trigger from overvoltage then clamp like Darlington transistors for lower voltage drop over a
Snubber
Current output as a function of applied voltage for a material or device
family of I–V curves for a MOSFET as a function of drain voltage with overvoltage (VGS − Vth) as a parameter. The simplest I–V curve is that of a resistor
Current–voltage characteristic
Current–voltage_characteristic
United States military standard for aircraft power interfaces
ripple, maximum current, electrical noise and abnormal conditions (overvoltage and undervoltage), for both AC and DC systems. MIL-HDBK-704 is a handbook
MIL-STD-704
Type of adjustable-speed drive
powered drives, significant overvoltages have been observed at cable lengths as short as 3 meters. Solutions to overvoltages caused by long lead lengths
Variable-frequency_drive
2017 wildfire in Southern California
about 900 MW of solar capacity near-instantaneously due to the subcycle overvoltage fault. 2017 California wildfires 2018 Southern California mudflows "Anaheim
Canyon_Fire_2
Device to couple energy between circuits
Transformers may require protective relays to protect the transformer from overvoltage at higher than rated frequency. One example is in traction transformers
Transformer
Weather phenomenon involving electrostatic discharge
2017. Uman (1986) Ch. 9, p. 78. "Lightning Protection and Transient Overvoltage" (PDF). Randall Cerveny; et al. (WMO panel) (February 1, 2022), "New
Lightning
Electrochemical method for metallic sodium
densities in the electrolyte despite its inherent electrical resistance. The overvoltage and consequent resistive heating also provides additional heat, helping
Downs_cell
Source of electricity
relatively little tolerance for overvoltage and overcurrent. The typical protections include: instant AC overvoltage. A high-amplitude voltage surge can
Inverter-based_resource
24-pin USB connector system
voltage than what the source will actually deliver. This may result in an overvoltage on the VBUS pin. Also due to the fine pitch of the USB‑C receptacle,
USB-C
1961–1962 series of Soviet weaponry tests
gas-filled overvoltage protectors. The EMP from the 22 October (K-3) nuclear test caused all of the fuses to blow and all of the overvoltage protectors
Soviet Project K nuclear tests
Soviet_Project_K_nuclear_tests
Battery current regulator
protect against electrical overload, overcharging, and may protect against overvoltage. This prevents conditions that reduce battery performance or lifespan
Charge_controller
Design feature or practice
prevents damage by short-circuiting the power supply as soon as it detects overvoltage. As well as physical devices and systems fail-safe procedures can be
Fail-safe
IEC classification of live electric circuits
Working Voltage Transient Overvoltage CAT IV CAT III CAT II CAT I 150 V 4,000 V 2,500 V 1,500 V 800 V 300 V 6,000 V 4,000 V 2,500 V 1,500 V 600 V 8,000
Measurement_category
Type of capacitor
sleeve to be destroyed in a real explosion. Explosions can be due to: Overvoltage and Reverse Polarity: Applying a voltage higher than the rated value
Electrolytic_capacitor
Facets of an ancillary service
connected to an end of a long transmission line or a weak system to prevent overvoltage under light load (Ferranti effect); passive sources of reactive power
Voltage control and reactive power management
Voltage_control_and_reactive_power_management
Wind transfomer
supported by a transformer winding considering the incoming transient overvoltage (voltage spike). It determines the safety margin regarding to the standard
Severity_factor
Electrical waves in return direction
modifying frequency responses, causing overload power in transmitters and overvoltages on power lines. However, the reflection phenomenon can be useful in such
Reflections of signals on conducting lines
Reflections_of_signals_on_conducting_lines
Measurement of power meeting specifications
system operator to decrease demand or increase system operating margins. "Overvoltage" occurs when the nominal voltage rises above 110% for more than 1 minute
Electric_power_quality
Functions performed by a subscriber line interface circuit in telephone service
service. The letters represent the following functions: battery feed (B), overvoltage protection (O), ringing (R), signaling (S), coding (C), hybrid (H), and
BORSCHT
Nuclear power plant in Forsmark, Sweden
this disconnection, in turn, led to a large overvoltage on various supplies within the station. The overvoltage caused failure of the control circuitry of
Forsmark_Nuclear_Power_Plant
Spanish politician and chemical engineer (born 1976)
cyberattack". AP News. 17 June 2025. Retrieved 17 June 2025. "Spain blames 'overvoltage' for huge April blackout". 17 June 2025 – via Le Monde. Villar, Cote
Sara_Aagesen
Term in electrical engineering
unity. Without such measures, low SCR conditions can lead to excessive overvoltages, low-frequency resonances, and control system instability. Wind farms
Short circuit ratio (electrical grid)
Short_circuit_ratio_(electrical_grid)
Linear integrated circuit precision shunt regulator
Marco (December 2019) [July 2018]. Using the TL431 for Undervoltage and Overvoltage Detection (PDF) (Application Report). Rev. A. Texas Instruments. SLVA987A
TL431
subjected to a disturbance such as opening of a switch. It can cause overvoltages and overcurrents in an electrical power system and can pose a risk to
Ferroresonance in electricity networks
Ferroresonance_in_electricity_networks
Ways electronic components fail and prevention measures
500 volts. A broken metallisation on a chip may thus cause secondary overvoltage damage. Thermal runaway can cause sudden failures including melting,
Failure of electronic components
Failure_of_electronic_components
Type of gas-filled tube used as a pulsed modulator device
high temperatures, high radiation, electromagnetic pulse, and repeated overvoltage and overcurrent events. Crossatron switch applications in power conditioning
Crossatron
Chemical compound
resistivity, good corrosion resistance even in low-pH medium, and a high overvoltage for the evolution of oxygen in sulfuric- and nitric-acid-based electrolytes
Lead_dioxide
Switchgear used in power systems above 1000 volts
resistor to limit overvoltages. They can be equipped with devices to synchronize closing and/or opening, to limit the overvoltages and the inrush currents
High-voltage_switchgear
Type of iron oxide
flammable/explosive. Care should also be taken to avoid hydrogen embrittlement. Overvoltage also produces small amounts of ozone, which is highly toxic, so a low
Rust
Electrical grounding for safety or function
voltage (relative to earth). IT systems also experience larger transient overvoltages than other systems. While the national wiring regulations for buildings
Earthing_system
Reliability test applied to integrated circuits
than the breakdown voltage; Set the overvoltage to be higher than the maximum specified voltage. An overvoltage level of 140% of the maximum voltage
High-temperature operating life
High-temperature_operating_life
American electronic manufacturing company
Products. 2002 – Semitron. 2003 – Teccor, a manufacturer of circuit and overvoltage protection products. 2004 – Heinrich Industrie, a German manufacturer
Littelfuse
Material that government claims requires confidentiality
archives, where they are either destroyed (by incineration, crushing, or overvoltage), or stored. In case of unauthorized release of classified information
Classified_information
Dangerous condition in electrical systems
overcurrent Current limiting Electrical fault Electrical safety testing Overvoltage Keller, Kimberley J. (2010). Overcurrent Protection. Butterworth-Heinemann
Overcurrent
Electric generator that powers its own field winding
1960's. Shunt generators are always used with regulators that regulate overvoltage and overcurrent, and disconnect the generator at undervoltage. In a shunt-wound
Shunt_generator
Type of diode
are designed to tolerate large surge currents for the suppression of overvoltage transients. In many applications this function is now served by metal
DIAC
Device that controls current between electrodes
less susceptible than corresponding solid-state components to transient overvoltages, such as mains voltage surges or lightning, the electromagnetic pulse
Vacuum_tube
Electronic component
dictionary of electronics. Newnes. ISBN 0-7506-9866-7. Peter Hasse (2000). Overvoltage protection of low voltage systems. IET. ISBN 0-85296-781-0. Paul Horowitz
Opto-isolator
Ratio of active power to apparent power
create resonant conditions, resulting in system instability and severe overvoltage fluctuations. As such, reactive elements cannot simply be applied without
Power_factor
Electronic device that converts or regulates electric energy and supplies it to a load
OCP - Overcurrent protection OTP - Overtemperature protection OVP - Overvoltage protection UVP - Undervoltage protection CV - Constant voltage CC - Constant
Power_supply
Branch of physical chemistry
the initial analysis is correct, there is another effect, known as the overvoltage effect. Additional voltage is sometimes required, beyond the voltage
Electrochemistry
Internally commutated electric motor
motor controllers or starters. In addition, motors can be protected from overvoltages or surges with isolation transformers, power conditioning equipment,
Brushed_DC_electric_motor
Part of the International Space Station; sequence of connected trusses
on the IEA and is normally set to around 140 volts. The SSU has an overvoltage protection feature to maintain the output voltage below 200 V DC maximum
Integrated_Truss_Structure
Light source based on gas discharge
glow-discharge lamps allows them to be used as voltage regulators or overvoltage protection devices. Starting around the 1930s, General Electric (GE)
Neon_lamp
Effect of a nuclear explosion on electronic equipment
by repeaters. Each sub-line was protected by fuses and by gas-filled overvoltage protectors. The EMP from the 22 October (K-3) nuclear test (also known
Nuclear_electromagnetic_pulse
Business laptops and tablets series from Lenovo
Built-in safety features protect the charger and laptop from overheating, overvoltage, and short circuits. ThinkPlus chargers are compact and lightweight,
ThinkPad
Technique in chemistry and manufacturing
84-88. Blum, W.; Vinal, G. W. (1934). "The Definition of Polarization, Overvoltage and Decomposition Potential". Transactions of the Electrochemical Society
Electrolysis
requirements, methods of testing and required test results IEC TR 62066 Surge overvoltages and surge protection in low-voltage a.c. power systems – General basic
List_of_IEC_standards
Part of a Geiger counter
show uniform spacing, dependent on the tube fill gas and overvoltage. At high enough overvoltages, but still below the onset of continuous corona discharges
Geiger–Müller_tube
Power management technique of varying the voltage used by a component
supply applications (SMPS) applications Switching energy Power ramp Overvoltage Undervoltage Voltage optimization J. M. Rabaey. Digital Integrated Circuits
Dynamic_voltage_scaling
in the 787 were made by Yuasa. On January 20, the NTSB declared that overvoltage was not the cause of the Boston incident, as voltage did not exceed the
2013 Boeing 787 Dreamliner grounding
2013_Boeing_787_Dreamliner_grounding
Elevated temperature in an electric circuit
effects, and cause-effect loops for overheating A short circuit caused by overvoltage destroys an integrated circuit. Joule heating or resistive heating is
Overheating_(electricity)
German offshore wind farm in the North Sea
its activation. BARD went bankrupt in November 2013. Problems include overvoltage and harmonics between BARD and the BorWin 1 grid link and BorWin Alpha
BARD_Offshore_1
Topics referred to by the same term
to upload, convert, store and play back video content on the Internet Overvoltage protection, in a power supply Open Virtual Platforms OVPsim, for simulating
OVP
Electrical generator in a bicycle wheel
SR Suntour offered the DH-CT-630 hub dynamo series with integrated overvoltage protection. It was apparently discontinued in 2010, as it is absent from
Hub_dynamo
Continuous probability distribution
engineering and failure analysis In electrical engineering to represent overvoltage occurring in an electrical system In industrial engineering to represent
Weibull_distribution
1967 Soviet film
too many human tasks which he can not fulfill. Its circuits fail from overvoltage and it breaks. The inventors of the robot find it and take it for regeneration
His_Name_Was_Robert
MOSFET that can handle significant power levels
Parasitic inductances tend to maintain their current constant and generate overvoltage during the transistor turn off, resulting in increasing commutation losses
Power_MOSFET
Short-duration reduction in the voltage of an electric power distribution system
Standler, Ronald B. (1989). Protection of electronic circuits from overvoltages. New York: Wiley. p. 40. ISBN 9780471611219. R. Sastry Vedam; Mulukutla
Voltage_sag
Oscillations in an electric grid
stability issues, including the oscillations (in addition to subcycle overvoltage and AC overcurrent). In some cases, high frequency oscillations (hundreds
Grid_oscillation
Small device to convert solar energy to electricity
regulator must be included in the charging circuit so as to not over-charge (overvoltage) a device such as a 12 volt car battery. Portable solar chargers are
Solar_charger
Illumination devices attached to bicycles
but modern lamps and dynamos often incorporate Zener diodes to prevent overvoltage, and dynamos can be designed to saturate beyond a certain voltage to
Bicycle_lighting
Defect that causes abnormal electric current
components. Even in systems that are normally connected to ground to limit overvoltages, some applications require a ground fault interrupter or similar device
Electrical_fault
Electrical power device
operator to decrease demand or to increase system operating margins. "Overvoltage" occurs when the nominal voltage rises above 110% for more than 1 minute
Power_conditioner
Electronic component
such as a UPS, a voltage regulator or a surge protector with built-in overvoltage protection (which typically consists of a voltage-sensing circuit and
Varistor
Increasing processor speed beyond specification
performance (throttling), abrupt shutdown and reboots due to overheat, overvoltage or overcurrent, data loss and data corruption. Increasing the operation
Overclocking
In computing, a condition where an expression does not have a correct value
voltage level. The voltage should not be abnormal (e.g. not a damaging overvoltage), but the particular logic level is unimportant. The same situation occurs
Undefined_value
Amateur radio transceiver
VERY sensitive and can easily be destroyed by high SWR, overheating, overvoltage, or voltage peaks. In the ND model, Yaesu (Vertex) replaced the FETs
Yaesu_FT-817
Metal–air electrochemical cell
However, the carbonate solvents evaporate and get oxidized due to a high overvoltage upon charge. Other solvents, such as end-capped glymes, DMSO, dimethylacetamide
Lithium–air_battery
American semiconductor company
volts. Over time, supercapacitors cells designed in parallel create overvoltage, which can damage each cell and cause the energy storage application
Advanced_Linear_Devices
Reference electrode whose potential depends on pH
Abstract 1863. MacInnes, Duncan A. & Adler, Leon (1919). "Hydrogen overvoltage". Proceedings of the National Academy of Sciences of the United States
Reversible_hydrogen_electrode
Electronic measuring instrument that combines several measurement functions in one unit
explosively than more common glass fuses. They will also include high energy overvoltage MOV (Metal Oxide Varistor) protection, and circuit over-current protection
Multimeter
OVERVOLTAGE
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Girl/Female
Indian, Tamil
Attractive
Boy/Male
American, Australian, Christian, Danish, German, Teutonic
Strong; Bold; Brave; Daring
Boy/Male
Hindu, Indian
Son of Indra
Boy/Male
Shakespearean American Hebrew Biblical
Henry VI, Part 2' Matthew Goffe.
Boy/Male
American, British, English
Rabbit
Female
Thai/Siamese
Thai name KOSUM means "flower."
Boy/Male
Arabic, Muslim
Slave of the All Embracing
Girl/Female
Muslim
Crest
Girl/Female
Muslim/Islamic
Great
Girl/Female
French
Blackbird.
OVERVOLTAGE
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