CN201611776U

CN201611776U - Distributed low-current earthing line selection device with multiple CPU frameworks

Info

Publication number: CN201611776U
Application number: CN2009201669629U
Authority: CN
Inventors: 李新永
Original assignee: Hebei Xinmin Electric Technology Co Ltd
Current assignee: Hebei Xinmin Electric Technology Co Ltd
Priority date: 2009-07-21
Filing date: 2009-07-21
Publication date: 2010-10-20
Anticipated expiration: 2019-07-21

Abstract

The utility model relates to a distributed low-current earthing line selection device with multiple CPU frameworks, which comprises a high-voltage chamber and a master-control chamber, wherein a plurality of voltage transformer acquisition modules and a plurality of current transformer acquisition modules are arranged inside the high-voltage chamber, a CPU is arranged inside each acquisition module, each CPU is connected with an outgoing line, zero sequence voltage transformers are arranged on a certain number of outgoing lines, zero sequence current transformers are mounted on a plurality of outgoing lines between the two outgoing lines on which the zero sequence voltage transformers are arranged, and a central line judging unit is arranged inside the main control chamber and respectively connected with the voltage transformer acquisition module and the current transformer acquisition module through data buses. The utility model has the benefits that the multi-CPU parallel processing technique is adopted, and the problems of fewer points of transient high-frequency signals and low accuracy are solved; and the distributed installation reduces measurement errors caused by unbalance secondary load of CT, reduces intermediate switching over links of a secondary cable, and reduces construction cost.

Description

A kind of distributing Small Electric Current Earthing And Routing Device of multi-CPU architecture

Technical field

The utility model relates to transformer station's isolated neutral system or the neutral point network system with grounding through arc, relates in particular to a kind of distributing Small Electric Current Earthing And Routing Device of multi-CPU architecture.

Background technology

Small current system is meant not solidly grounded system of neutral point, comprises isolated neutral system, and neutral by arc extinction coil grounding system or neutral point resistance grounded system in the electrical network of 66 kilovolts and following electric pressure, generally all adopt this system; The line selection mode that the device of domestic little electric current route selection adopts has colony than amplitude ratio phase, quintuple harmonics method, power direction method, active current method, residual flow method of addition, injection method, medium resistance method etc., with regard to its data acquisition modes, what nearly all line selection apparatus all adopted is that single CPU carries out data collection and analysis, the line selection apparatus that is known as many CPU is also arranged, its core only is to adopt two CPU to carry out the analysis and the processing of data, one carries out data acquisition; Its two, carry out data analysis and processing.We as can be seen, device with regard to domestic little electric current route selection, all line selection apparatus all have been put into the technology emphasis in the application and technological innovation of route selection principle, acquisition mode for data, do not obtain due attention, cause Transient High Frequency Signal to adopt counting less, the data acquisition accuracy is low, project cost is high.

The utility model content

The purpose of this utility model provides a kind of distributing Small Electric Current Earthing And Routing Device of multi-CPU architecture, to overcome the deficiency that the employing of conventional device Transient High Frequency Signal is counted less, the data acquisition accuracy is low, project cost is high.

The purpose of this utility model is to be achieved through the following technical solutions:

A kind of distributing Small Electric Current Earthing And Routing Device of multi-CPU architecture, comprise hyperbaric chamber and master-control room, the inside in described hyperbaric chamber is provided with the plurality of sections bus, some voltage transformer acquisition modules and some current transformer acquisition modules, the inside of described each acquisition module all is provided with CPU, each CPU connects an outlet, wherein in several outlets zero sequential potential transformer is installed, in some the outlets between described two outlets that zero sequential potential transformer is installed zero sequence current mutual inductor is installed all, described voltage transformer acquisition module is gathered the open delta voltage that the zero sequential potential transformer direction transmits, the current transformer acquisition module is gathered the zero-sequence current that the zero sequence current mutual inductor direction transmits, described each outlet all is connected with bus by switch, every section bus is connected with one or more outlet that zero sequential potential transformer is installed, be connected with switch by electric wire between the switch that each switch in parallel and outlet that each zero sequential potential transformer in parallel is installed connect and the switch that the outlet that zero sequence current mutual inductor is installed of one side parallel connection is connected, the inside of described master-control room is provided with central authorities and declares the line unit, and central authorities declare the line unit and are connected with voltage transformer acquisition module summation current transformer acquisition module respectively by data/address bus.

The beneficial effects of the utility model are: adopt multiple CPU parallel processing technology, promptly the zero sequence signal of each bar outlet is finished collection with independent CPU, and solution is adopted to count to Transient High Frequency Signal and lacked the problem that precision is low; Adopt distributing to install and reduce the measure error that CT secondary load imbalance is brought, avoid secondary weak current signal to introduce and disturb, reduce secondary cable intermediate transit link, reduce laying of secondary cable in a large number, reduce project cost because of long line transmission.

Description of drawings

With reference to the accompanying drawings the utility model is described in further detail below.

Fig. 1 is the distributing Small Electric Current Earthing And Routing Device schematic diagram of the described a kind of multi-CPU architecture of the utility model embodiment.

Among the figure:

1, hyperbaric chamber; 2, master-control room; 3, voltage transformer acquisition module; 4, current transformer acquisition module; 5, outlet; 6, zero sequential potential transformer; 7, zero sequence current mutual inductor; 8, switch; 9, the line unit is declared by central authorities; 10, data/address bus; 11, bus.

Embodiment

As shown in Figure 1, the distributing Small Electric Current Earthing And Routing Device of the described a kind of multi-CPU architecture of the utility model embodiment, comprise hyperbaric chamber 1 and master-control room 2, the inside in described hyperbaric chamber 1 is provided with plurality of sections bus 11, some voltage transformer acquisition modules 3 and some current transformer acquisition modules 4, described each acquisition module 3,4 inside all is provided with CPU, constitute multi-CPU architecture, each CPU connects an outlet 5, wherein in several outlets 5 zero sequential potential transformer 6 is installed, in some the outlets 5 between described two outlets 5 that zero sequential potential transformer 6 is installed zero sequence current mutual inductor 7 is installed all, described voltage transformer acquisition module 3 is gathered the open delta voltage that zero sequential potential transformer 6 directions transmit, current transformer acquisition module 4 is gathered the zero-sequence current that zero sequence current mutual inductor 7 directions transmit, described each outlet 5 all is connected with bus 11 by switch 8, every section bus 11 is connected with one or more outlet 5 that zero sequential potential transformer 6 is installed, be connected with switch 8 by electric wire between the switch 8 of in parallel and each zero sequential potential transformer 6 outlet of installing 5 connection in parallel of each switch 8 and the switch 8 that zero sequence current mutual inductor 7 outlet of installing 5 of one side parallel connection is connected, the inside of described master-control room 2 is provided with central authorities and declares line unit 9, and central authorities declare line unit 9 and are connected with voltage transformer acquisition module 3 summation current transformer acquisition modules 4 respectively by data/address bus 10.

When small current neutral grounding system when unidirectional earth fault takes place, the zero-sequence current or the residual voltage of 4,3 pairs of systems of acquisition module are gathered, after distributing is handled, send information to central authorities with the form of digital quantity and declare line unit 9, be grounded route selection by the data message that receives.

Claims

1. the distributing Small Electric Current Earthing And Routing Device of a multi-CPU architecture, comprise hyperbaric chamber (1) and master-control room (2), it is characterized in that: the inside of described hyperbaric chamber (1) is provided with plurality of sections bus (11), some voltage transformer acquisition modules (3) and some current transformer acquisition modules (4), described each acquisition module (3), (4) inside all is provided with CPU, each CPU connects an outlet (5), wherein in several the outlets (5) zero sequential potential transformer (6) is installed, in some the outlets (5) between described two outlets (5) that zero sequential potential transformer (6) is installed zero sequence current mutual inductor (7) is installed all, described voltage transformer acquisition module (3) is gathered the open delta voltage that zero sequential potential transformer (6) direction transmits, current transformer acquisition module (4) is gathered the zero-sequence current that zero sequence current mutual inductor (7) direction transmits, described each outlet (5) all is connected with bus (11) by switch (8), the outlet (5) that every section bus (11) and one or more is equipped with zero sequential potential transformer (6) is connected, the switch (8) of in parallel and each zero sequential potential transformer in parallel (6) institute outlet of installing (5) connection of each switch (8) and the zero sequence current mutual inductor (7) of one side parallel connection be connected with switch (8) by electric wire between the switch (8) that is connected of the outlet of installing (5), the inside of described master-control room (2) is provided with central authorities and declares line unit (9), and central authorities declare line unit (9) and are connected with voltage transformer acquisition module (3) summation current transformer acquisition module (4) respectively by data/address bus (10).