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Method and device for disconnection of faults in an electric network

A power grid and fault technology, applied to the fault field in the power grid, to achieve the effect of less heat restriction

Inactive Publication Date: 2017-11-21
DLAB SWEDEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0043] Thus, the maximum fault clearing time and the selectivity requirement together limit the number of time settings available in the selectivity plan and implicitly limit the number of secondary substations that can be included in the feeder loop

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  • Method and device for disconnection of faults in an electric network
  • Method and device for disconnection of faults in an electric network
  • Method and device for disconnection of faults in an electric network

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Embodiment Construction

[0059] Figure 1a~1e Some of the components used in the distribution grid are shown. Figure 1a The load switching device 10 is shown on the left in the open, ie disconnected state (OFF). On the right side the load disconnector is shown in closed, ie connected state (ON). The term "load switching device" refers to a general term for all switching devices such as a load switch and the like capable of interrupting normal load current, and the load switch is a load switch with a disconnector and a load switch with a fuse and the like. in the same way, Figure 1b A circuit breaker 12 is shown. On the left side of 12 the circuit breaker is shown in the OFF state and on the right side the circuit breaker 12 is shown in the connected (ON) state.

[0060] Depending on the context, the general term station can be used for secondary substations or substations.

[0061] A secondary substation usually has a transformer and switchgear (usually a load disconnect switch). Typically, thr...

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Abstract

A method and a device for disconnection of faults in an electric network comprising a plurality of stations (14; 34; 38) connected in a loop, comprising feeding the loop from at least two feeding points(A, B) from a power source (17), earthing a neutral point of the electric network through an impedance (36), detecting earth faults in a directional earth fault protection (18) in at least one first secondary substation (14) provided with directional earth fault protection (18), disconnecting a detected earth fault by a load switching device (10) in said at least one first secondary substation (14) provided with directional earth fault protection (18), detecting fault currents arising from short circuits between two or more phases in an over-current protection (28) of a second secondary substation (34), and opening said loop with a circuit breaker (12) of said second secondary substation (34).

Description

technical field [0001] The invention proposes a method and a device for disconnecting a fault in a power grid having several stations connected in a loop. In particular, the invention can be used for fault clearance in impedance-grounded three-phase grids with feeder loops. Background technique [0002] A secondary substation usually has a transformer and switchgear. Typically, three-phase medium voltage 10kV or 20kV is transformed into three-phase low voltage 400V to distribute power to industrial and domestic customers. Typically, the power ratings of transformers in secondary substations range from 50 kVA to 500 kVA. [0003] A substation typically has one or more transformers, switchgear, protection relays, and other control equipment. Typically, the voltage is converted from the regional network (typically 130kV) to medium voltage (10kV or 20kV). Transformers in substations are typically rated from 2MVA to 50MVA. [0004] A three-phase distribution network is usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26G01R31/086G01R31/52H02H7/261H02H7/28Y04S10/52H02H9/08H02H3/165
Inventor 马格努斯·阿可
Owner DLAB SWEDEN