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Fault clearing circuitry

A fault clearing and fault technology, applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problem of large inverter size and achieve the effect of eliminating excessive size design

Pending Publication Date: 2020-10-13
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this requires the inverter to be oversized and thus requires more technical resources than are required for normal operation of the inverter

Method used

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  • Fault clearing circuitry
  • Fault clearing circuitry
  • Fault clearing circuitry

Examples

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Embodiment Construction

[0024] Hereinafter, functionally similar or identical elements may have the same reference signs. Absolute values ​​hereinafter are given as examples only and should not be construed as limiting.

[0025] figure 1 Fault clearing circuitry 10 is shown for a single phase power line 16 . The circuit system 10 may be applied, for example, to a single-phase UPS system for monitoring a fault condition on the UPS output, such as a short circuit, and assisting in rapid recovery from the UPS output by delivering a current pulse sufficient to open a circuit breaker in the event of an overcurrent condition. Disconnect failure.

[0026] The circuit system 10 includes: for electrical energy storage implemented by a capacitor 12, a controllable switch implemented by a silicon controlled rectifier (SCR) 14, a control and drive circuit 18, a series connection of a diode 20 and a resistor 22 for Charging circuitry is implemented for charging the capacitor 12 , a current rise limiter is impl...

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Abstract

A fault clearing circuitry (10) is disclosed, which comprises an electrical energy storage (12), at least one controllable switch (14) connectable between the electrical energy storage (12) and at least one electric line (16; 16', 16", 16"'), and a control circuit (18) configured to monitor the at least one electric line (16) for a fault and to close the at least one switch (14) if a fault is detected wherein the electrical energy storage (12; 12') is provided for storing an amount of electrical energy dimensioned to be sufficient for releasing one or more circuit breakers or clearing one or more fuses in the at least one electrical line (16, 16', 16", 16"') in order to clear the fault, and wherein the control circuit (18; 18') is configured to close the at least one switch (14; 14', 14",14"') if a fault is detected such that a discharging of the electrical energy stored in the electrical energy storage (12; 12') causes a current pulse injected in the at least one electrical line (16,16', 16", 16"') so that a higher current in the at least one electrical line (16, 16', 16", 16"') is incurred for a limited time span, wherein the time limited higher current may release the one or more circuit breakers or clear the one or more fuses in the at least one electrical line (16, 16', 16", 16"').

Description

technical field [0001] This specification relates to fault clearing circuitry, particularly for use in power inverters. Background technique [0002] For example, power inverters applied in uninterruptible power supply (UPS) systems or in grids may be able to clear the Faults such as short circuits or ground faults. The fault clearing capability of the inverter, i.e. the higher current, is usually about 2-3 times the normal current. However, in many cases this may not be sufficient to open a distribution fuse or circuit breaker. To overcome this problem, the inverter may be oversized to have a higher fault clearing capability and to supply a much higher current in the event of a fault. However, this requires the inverter to be oversized and thus requires more technical resources than are required for normal operation of the inverter. [0003] European patent application EP 2 290 774 A1 discloses a network protection device arranged to protect an EPDN (Power Distribution ...

Claims

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Application Information

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IPC IPC(8): H02H1/06H02H3/02H02H3/08
CPCH02H1/06H02H3/08H02H3/025H02H3/021H02H7/122H02H3/05H02H3/17H02H1/0007
Inventor T·科斯塔玛科伊J·A·S·乌西塔洛
Owner EATON INTELLIGENT POWER LIMITED