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A Logical Protection Device for Parallel Node Faults in Electrical Circuits

A technology of electrical circuits and protection devices, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., and can solve the problems that the dual power ring network cannot be powered by dual power sources, and the bus tie switch cannot be closed.

Active Publication Date: 2018-08-21
四川东大恒泰电气有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The logic protection device formed by this method provides a method for substations, factory high and low voltage power distribution rooms, local power supply networks and residential power supply networks that can accurately and quickly remove faults, and at the same time solve the problem that the dual power supply ring network cannot have dual power supplies. A new protection method for the problem that the bus tie switch cannot be closed when the dual power supplies in the high and low voltage power distribution room of the power supply, substation and factory are running at the same time

Method used

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  • A Logical Protection Device for Parallel Node Faults in Electrical Circuits
  • A Logical Protection Device for Parallel Node Faults in Electrical Circuits
  • A Logical Protection Device for Parallel Node Faults in Electrical Circuits

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Embodiment 1

[0081] Embodiment 1: see figure 1 Wherein, the present invention is applied in a single power supply ring network power supply network, the common point of A1, A2, B1, B2, B3 constitutes a parallel electrical node P1, similarly A3, A4, B4, B5, B6 and A5, B7, B8 and B9 constitute the parallel electrical nodes P2 and P3 respectively. For each node from P1 to P3, the logic protection of the present invention can be adopted, and the fault point and the path of fault current are as follows: Figure 6-1 and Figure 6-2 The results of the analysis are shown in Table 2.

Embodiment 2

[0082] Example 2: see figure 2 , the present invention is applied in a dual power supply ring network power supply network, the common point of (A1, A2, B1, B2, B3) constitutes a parallel electrical node P1, similarly (A3, A4, B4, B5, B6) and ( A5, A6, B7, B8, B9) form parallel electrical nodes P2 and P3 respectively. The difference from Embodiment 1 is that there is an additional incoming switch A6 of the power supply S2. The logic protection of the present invention can be adopted for each node from P1 to P3. The fault point and the path of the fault current are shown in FIG. 6 , and the faults shown in FIG. 6 exist for nodes P1 and P3 at the same time. The results of the analysis are shown in Table 2.

Embodiment 3

[0083] Embodiment 3: see image 3 , the present invention is applied in radial power supply network, (S1, A1, A4), (A2, A3, A5), (A4, B1, B2) and (A5, B3, B4) constitute the parallel electrical nodes P1 to P4. The logical protection of the present invention can be adopted for each node, and the fault point and the path of the fault current can still be equivalent to the fault of the node such as Figure 6-1 and branch faults such as Figure 6-2 The results of the analysis are shown in Table 2.

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Abstract

The invention discloses a logic protection device for a parallel node fault of an electric loop. By simple judgment on each branch current, whether a short-circuit fault occurs in a parallel connection point and each branch or not is judged; a power direction of each branch is simultaneously judged, a path of a fault current is determined, and logic operation is carried out according to an input condition; and the branch in which the short-circuit fault occurs is judged. A new method is provided for fault analysis of the electric loop, and the problems that a protection mode of a multi-stage current constant value matched with time limit is not suitable for a local power supply grid, a multi-branch power distribution line, a residential annular power supply grid in a medium-voltage 3-20kV power distribution voltage to cause that fuse protection is only adopted or production cannot be effectively matched can be solved; meanwhile, the problem that a high- and low-voltage bus only can run according to segments in dual power supplies also can be solved, and an appropriate short-circuit protection scheme is provided; and moreover, the logic protection device has the advantages of very fast action speed, high reliability, favorable expandability and convenience in maintenance.

Description

technical field [0001] The invention relates to a node fault protection device in a power grid, in particular to a logical protection device for a node fault in parallel connection of an electric circuit. Background technique [0002] At present, the fault protection of the high and low voltage power distribution system of the power system is still the relay protection that adopts the multi-level differential current protection setting value and the protection action time limit. See the accompanying drawings in the manual Figure 1 to Figure 3 , are three common local power supply networks and community power supply networks. The power supply network has the following problems: [0003] 1. The relay protection with multi-level differential current protection fixed value and protection action time limit is not suitable for local power supply network and community power supply network. [0004] The relay protection with multi-level differential current protection fixed value...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J9/00
CPCH02H7/267H02J9/00
Inventor 滕振海
Owner 四川东大恒泰电气有限责任公司