Surge suppression is provided by varistors connected between, respectively, hot and neutral conductors and hot and ground conductors, each through a common fuse that avoids hazardous overvoltages on the varistors. A first indicator circuit portion provides an indication that the power is on and surge protection is present and includes a first indicator device such as a green light-emitting diode that is energized when the fuse is intact, and a second indicator circuit portion is provided for indicating power is on and surge protection is lacking that includes a second indicator device such as a red light-emitting diode that is energized by the line conductors when the fuse has been interrupted. The surge suppressor and dual indicator apparatus can be contained within a wiring device such as a receptacle. A single varistor unit containing two varistor disks with three leads, including a center tap, allows three effective surge suppressor circuit branches in a compact configuration.

Electrical surge suppressor and dual indicator apparatus

Methods, computer program segment and apparatus for analyzing high voltage circuit breakers are provided. The method includes determining a circuit breaker contact closing time, determining a circuit breaker contact opening time, and determining a circuit breaker pre-insertion resistor resistance value using at least three voltage samples and three current samples to facilitate reducing an induced current measurement error. The computer program segment is embodied on a computer readable media and is programmed to determine a circuit breaker contact closing time, determine a circuit breaker contact opening time, and determine a circuit breaker pre-insertion resistor resistance value using at least three voltage samples and three current samples that facilitate minimizing an induced current measurement error. The apparatus includes a testing circuit, an overvoltage protection circuit, and a processor programmed to determine a circuit breaker contact timing measurement and a circuit breaker contact resistance measurement.

Methods and apparatus for analyzing high voltage circuit breakers

A portable power fault testing apparatus for testing telecommunications equipment's line cards to BellCore's AC power fault standards. A switched transformer unit is coupled to a single-phase AC line voltage source for generating a switched voltage output in 0-220 volt range or in 0-1100 volt range. A primary control relay is coupled to the switched transformer unit for applying the switched voltage output for selected time durations under control of an external computer. A test selector switch coupled to the primary control relay connects the switched voltage output to either a resistive test circuit portion or an inductive test circuit portion, each of which is designed to comply with the respective AC power fault testing conditions.

2nd level power fault testing apparatus for testing telecommunications equipment

A method of detecting failed disks in power-system surge arresters comprising a network of at least two parallel-coupled stacks of series-coupled ZnO varistors includes measuring differential current flow through each pair of stacks during surge voltage conditions, and comparing the current so measured with a fixed fraction of the total current carried by the arrester. Because each stack contains a like number of substantially identical varistors, current flow through the stack containing a failed disk will measurably exceed current flow through each non-defective stack. If the measured current flow through a stack is excessive relative to current flow through the remaining stacks, the excessive current flow stack is presumed to contain a defective disk. In today's technology, precision Rogowski coils or fiber-optic current sensors provide the high-bandwidth, high dynamic-range transducers necessary for the measurement of both total and differential current.

Method for detecting a failed ZnO disk in a surge arrester network

A metal oxide type surge arrester is provided with a plurality of arrester blocks in series within a housing having, in addition to line and ground terminals at the extremities, a bushing providing a tap voltage terminal intermediate the series stack such as between the bottom two arrester blocks The provision of the voltage tap and a shunt resistance in series with the ground terminal permits respectively detecting the voltage and the current of the arrester so that they can be compared and their phase relation observed to determine if the arrester blocks are maintaining a capacitive characteristic or have become resistive In addition, several other methods of use of such an arrester for monitoring line voltage, energy absorption, fault current and the like are disclosed

Surge arrester equipped for monitoring functions and method of use

Process and test generator for simulating the operation requirements of a protection device for an AC low, high or very high voltage power network. The generator comprises a voltage branch connected to the protection device for producing a sparkover voltage and an injection branch in parallel with this voltage branch for producing across the device under test a follow current of a value corresponding to the value of the current injected by the power network through this protection device when the latter is in operation. A resonant branch is connected to the injection branch for producing across the terminals of the protection device an alternating voltage corresponding to the voltage of the power network. The generator can also stimulate a long power transmission line and repetitive sparkovers of the device under test. Furthermore, a sparkover of the device can be performed at any phase angle of the power network voltage. The process and the generator are particularly useful for the testing surge arresters.

Circuit for testing protection devices

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Circuit for testing protection devices