CN2387653Y

CN2387653Y - Arc-eliminating coil microcomputer auto-tuning and earthing line-selecting device

Info

Publication number: CN2387653Y
Application number: CN 99239118
Authority: CN
Inventors: 杨小强; 李锋
Original assignee: Siyuan Electric Co ltd Shanghai
Current assignee: Siyuan Electric Co., Ltd., Shanghai
Priority date: 1999-07-29
Filing date: 1999-07-29
Publication date: 2000-07-12
Anticipated expiration: 2009-07-29

Abstract

The utility model relates to an arc-eliminating coil microcomputer auto-tuning and grounding line-selecting device. The output lines of an automatic tuning and grounding line-selecting controller XHK are respectively connected with an arc suppression coil and a damping resistance controller, and is connected with a circuitry zero sequence CT. The utility model implements automatic tuning and the grounding line-selecting functions of the arc suppression coil at the same time. The automatic tuning and grounding line-selecting controller XHK which uses the modular structure is composed of a CPU module, an arc suppression coil control module, a line-selecting module, a bus board and an interface board. The bus connection mode is used among the modules. The utility model uses apparent power algorithm, fundamental wave algorithm and harmonic algorithm. The arc-eliminating coil microcomputer auto-tuning and grounding line-selecting device has the advantages of good line-selecting accuracy and high precision.

Description

Automatic tuning of arc suppression coil microcomputer and line-selected earthing device

Automatic tuning of a kind of arc suppression coil microcomputer and line-selected earthing device are used to improve the fail safe of power system operation and the accuracy of accident treatment, belong to the automatic control technology of power system field.

In China 3-66KV system for distribution network of power, when system's capacitive earth current reaches 10A when above, thereby can not extinguishing automatically, the electric arc that single-phase earthing produces to develop into more serious accident, therefore need the installing arc suppression coil in order to reduce the electric current of earth point, should find faulty line as early as possible simultaneously.Microcomputerization has all been adopted in the adjusting of arc suppression coil and the selection of ground path at present, and has obtained application at real system.The mode of using is the automatic tuning by arc-extinguishing coil automatic tuning controller control arc suppression coil, the circuit when selecting single-phase earthing by line-selected earthing device.There is following shortcoming in present device:

1.x arc-extinguishing coil automatic tuning control is core with the single-chip microcomputer, is shown as man-machine interface with LED.The arithmetic speed of single-chip microcomputer is slow, and memory size is little, and the response speed of arc-extinguishing coil automatic tuning controller is slow simultaneously, and computational accuracy is poor, and the storage capacity of information is little, thereby does not reach the optimum adjustment effect;

2. the poor accuracy of failure line selection, because line-selected earthing device is that core constitutes by single-chip microcomputer also, and it is independent separately with arc-extinguishing coil automatic tuning device, therefore line-selected earthing device can not in time obtain the parameter of relevant arc suppression coil operation, thereby when calculating, route selection can not correctly find faulty line, cause and falsely drop, thereby the fail safe of power system operation and reliability are reduced greatly;

3. the speed of route selection is slow, when electric power system generation single phase ground fault, searching ground path fast and be the important means that guarantees safe operation of power system with its excision, is the line selection apparatus that core constitutes and adopt single-chip microcomputer, and computational speed has prolonged the time of accident treatment slowly, greatly;

4. less economical, owing to adopted arc-extinguishing coil automatic tuning controller and two equipment of line-selected earthing device, equipment investment increases, and floor space increases, and operating maintenance personnel workload increases.

The purpose of this utility model is the above-mentioned deficiency at prior art, a kind of integration unit that can finish arc-extinguishing coil automatic tuning and earthing wire-selecting is provided, can realize to the automatic tuning of arc suppression coil again can be when single-phase earthing takes place fast line selection, it is good to reach regulating effect, response speed is fast, the number of times of transferring the files is few, and the route selection computational speed is fast when simultaneously single-phase earthing taking place, the accuracy height.

For realizing such purpose, arc-extinguishing coil automatic tuning that the utility model provides and line-selected earthing device comprise that Z-shaped ground connection becomes B, arc suppression coil X, damping resistance R, damping resistance controller RCS and microcomputer automatic tuning and the earthing wire-selecting controller XHK of band vacuum switch.Tuning and earthing wire-selecting controller is connected to the centre tap and the damping resistance controller of arc suppression coil, and automatic tuning simultaneously and earthing wire-selecting controller also link to each other with the zero sequence CT of circuit.Technical characterictic of the present utility model is to realize simultaneously with microcomputer automatic tuning and earthing wire-selecting controller the automatic tuning and the earthing wire-selecting function of arc suppression coil.Tuning and route selection controller adopts modular construction, by CPU module, Arc Suppression Coil Control module XH, route selection module SL ₁, SL ₂, bus board BUS, interface board JK forms, and adopts bus connecting mode between the module, bus comprises data/address bus, address bus and control bus.Adopt 64 core plug-in units to be connected firmly between module and the bus board BUS, four 50 core flat cables of employing are connected between bus board and the interface board JK.Bus board BUS goes up expansion 8 slots, and each slot has different addresses, and module's address is determined by the slot of its insertion.The CPU module can discern whether be inserted with module on this slot automatically, and is distinguished each module automatically according to the address of slot.

CPU module employing Pentium is that the PC104 Industrial Control Computer of core is a host CPU in the utility model, extend out a slice 8253, a passage by 8253 is to system's frequency measurement, another passage is set to timing mode simultaneously, regularly voltage to neutral, neutral point current, circuit zero-sequence current are sampled, sample rate is each all wave point 100 point, and this time interval will revise to guarantee 100 points of each cycle sampling according to the variation of frequency.Expanded a 20V8 GAL able to programme on the CPU board and finished address decoding, and finished bus driver by 74LS245.The Arc Suppression Coil Control module is finished neutral point current by a MAX97, neutral point voltage, the data collection task of open delta voltage, the position signalling of vacuum switch auxiliary contact goes out that 16V8 GAL able to programme reads in and gives four ORMON relays output gears codings, vacuum switch deciliter by the control of two OMRON relays, interface board JK provides and vacuum switch, the terminal that connects between damping resistance controller and the circuit zero sequence CT and with PT, signal transformation becomes 0-10V and 0-20mA small-signal to the 100V of CT input with 5A, use for the A/D conversion, splicing ear adopts 6 sockets to dial the PTR terminal, route selection module SL1, SL2 is two identical modules, each module can be to 24 road zero-sequence currents input carrying out A/D conversion, the route selection module is a core with a slice MAX97, zero sequence current signal is by filtering, be connected on the variable connector CD4051 behind the circuit such as amplification, module has been expanded four CD4051 altogether, and the output of variable connector is connected on the input of MAX97.

Below in conjunction with accompanying drawing the technical solution of the utility model is further described:

Fig. 1 is the circuit connection diagram of each element of the utility model.

Among the figure, ABC three statures of Z-shaped grounding transformer B insert electrical network, draw the arc suppression coil X of tape splicing vacuum switch by the neutral point that ground connection becomes, the end of arc suppression coil X is through damping resistance R ground connection, the outlet of automatic tuning and earthing wire-selecting controller XHK links to each other with vacuum switch contact and the damping resistance controller RCS of arc suppression coil X respectively, and controller XHK also is connected with circuit zero sequence CT.

The model of Z-shaped transformer is DKSC, in order to produce artificial neutral point and the double station of doing with becoming.Have the adjusting of carrying arc suppression coil to adopt XHDC dry-type iron-core arc suppression coil to join vacuum switch and constitute, the model of vacuum switch is MFK.Damping resistance adopts stainless steel material, its model is ZX2, microcomputer is regulated and is gathered neutral point current, neutral point voltage and outlet zero-sequence current, power in real time, adopt Fu Shi algorithm real time computation system capacitance current, and regulate the arc suppression coil gear, owing to adopt high-speed a/d conversion and Fu Shi algorithm, so certainty of measurement height, it is effective to transfer the files, simultaneously because searching of faulty line adopted apparent power, first-harmonic and three kinds of algorithms of harmonic wave, the accuracy rate height of route selection during single-phase earthing.

Fig. 2 is the connection schematic diagram of the utility model automatic tuning and earthing wire-selecting controller XHK.

As shown in the figure, each part of controller is modularized design, CPU module, Arc Suppression Coil Control module XH, route selection module SL1, SL2 all are connected to bus board BUS, and bus comprises data/address bus, address bus And control bus. Adopt 64 core plug-in units firmly to be connected between each module and the bus board BUS, bus board BUS and connecing Adopt four 50 core flat cables to connect between the mouth module J K, but interface module is by plug terminals P TR branch Be not connected to the zero sequence CT of arc suppression coil X and damping resistance controller RCS and circuit.

Compared with the prior art the utility model has significant advantage:

1. the adjusting of arc suppression coil accurately, fast response time, the number of times of transferring the files be few;

2. because Arc Suppression Coil Control and earthing wire-selecting are finished by same device, so single-phase earthing is former During barrier, the fast response time accuracy rate height of route selection.

3. investment and the operation and maintenance cost of equipment have been reduced, because arc suppression coil is regulated and the company of route selection Connect all and in cabinet, finish, so the installation of equipment and maintenance are little, the reliability height of equipment.

Claims

1. arc suppression coil microcomputer automatic tuning and line-selected earthing device, comprise Z-shaped transformer B, arc suppression coil X, damping resistance R, damping resistance controller RCS and automatic tuning and earthing wire-selecting controller XHK, it is characterized in that inserting the neutral point connecting band vacuum switch arc suppression coil X of the Z-shaped transformer B of electrical network, arc suppression coil X is through damping resistance R ground connection, the outlet of automatic tuning and earthing wire-selecting controller XHK links to each other with vacuum switch contact and the damping resistance controller RCS of arc suppression coil X respectively, the XHK controller also links to each other with the zero sequence CT of circuit, realizes arc-extinguishing coil automatic tuning function and earthing wire-selecting function simultaneously.

2. one kind as claim 1 said arc suppression coil microcomputer automatic tuning and line-selected earthing device, it is characterized in that automatic tuning and earthing wire-selecting controller XHK adopt modular construction, form by CPU module, Arc Suppression Coil Control module XH, route selection module SL1, SL2, bus board BUS, interface board JK, adopt 64 core plug-in units to be connected firmly between module and the bus board, bus board BUS adopts 50 core flat cables to be connected with interface board JK, but interface board JK adopts PTR plug terminal with being connected of arc suppression coil X, damping resistance controller RCS, zero sequence CT.