CN201018275Y

CN201018275Y - Duplicate power supply loop network single phase earthing time sequence identification route selection device

Info

Publication number: CN201018275Y
Application number: CNU2007200182857U
Authority: CN
Inventors: 傅桂兴; 付英
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-01
Filing date: 2007-02-01
Publication date: 2008-02-06
Anticipated expiration: 2017-02-01

Abstract

The application discloses a dual-power supply ring net single phrase earthing sequence discriminating select switch, which comprises a single feeding out line earthing select module and periphery circuit. The utility model is characterized in that: the device also comprises a ring net single phrase earthing select module and the periphery circuit; the select module is composed of an ASIC, a zero phase sequence voltage signal circuit of generatrix, two loops of zero phase sequence current signal circuits if the power supply lead-in, two loops of (more than two loops) feeding out line zero phase sequence current signal circuits, two loops of loading current signal circuit of two phrases of power supply lead-in U and W and an output circuit. The application resolves the failure select of the signal phrase earthing generated on the power supply line or the generatrix and the common problems of the select of the feeding out line signal phrase earthing select and also enables the special problem of the single phrase earthing failure select generated on the power supply and generatrix in the dual-power supply ring net load dispatching office.

Description

Duplicate supply looped network single-phase earthing sequential is differentiated line selection apparatus

Technical field

The application belongs to Power System Faults Detection and protective relaying device, presses the single phase ground fault of duplicate supply annular electrical network to detect and the discrimination protection in being specifically related to.

Technical background

The applicant has applied on June 10th, 2002 that according to own " zero-sequence current (first-harmonic) time sequence logical discrimination then " of inventing utility model patent " small current grounding system single-phase grounding selecting device " (patent No. ZL02237567.8), on January 14th, 2005 applied for utility model patent " resonant earthed system single-phase grounding selecting device " (patent No. ZL200520080013.0) again.Above-mentioned patent mainly is made up of the general single-phase grounding selecting module of outgoing and the peripheral circuit that with the sequential discriminator are core.This device has solved the accurate route selection problem of the single-phase earthing leak current fault of isolated neutral (uncompensated) and neutral by arc extinction coil grounding undercompensation and overcompensation medium voltage network with " time sequence logical discrimination then ".But above patented product is the same with the like product of domestic and international other route selection principles, only is applicable to the single-phase earth fault line selection of the emanant electrical network outgoing of single supply.Also have duplicate supply ring distribution system, many power nets form power distribution network in the electric power system, the applicant also finds to solve the route selection technology and the protective device of the single phase ground fault of the complicated power distribution network of this class.

Summary of the invention

The application's purpose, be for solving the single-phase earth fault line selection problem of dual power supply net or ring distribution system, on the basis of the existing emanant electric network single-phase earth fault line selection apparatus of single supply, invent a kind of single-phase earthing sequential of dual power supply net or operation with closed ring ring distribution system that is applicable to and differentiate line selection apparatus.No matter this device single phase ground fault is the outgoing that occurs in this electrical network, still occur in a certain power line, perhaps occur on the bus, can both accurately detect, and indicate the guilty culprit circuit.

The application's technical scheme: it comprises existing outgoing single-line ground route selection module and peripheral circuit, and its feature also comprises

1, looped network single-phase grounding selecting module, this module is by the sequential discriminator, the residual voltage signal circuit of bus, the zero sequence current signal circuit of two-way electric power incoming line, two-way (or more than two-way) outgoing zero sequence current signal circuit, compositions such as the load current signal circuit of two-way electric power incoming line U, W two-phase and output circuit.Wherein:

(1) above-mentioned sequential discriminator constitutes by being provided with time sequence logical discrimination logical circuit or single-chip microcomputer then, and logical circuit can be with complex programmable logic device (CPLD) or application-specific integrated circuit ASIC.

(2) above-mentioned residual voltage signal circuit is after picking out from input socket CZ1, earlier through total phase shift and filtering, then divides three branch roads, and first branch road forms U again after phase shift, amplitude discrimination, shaping, photoelectricity are isolated _OFSignal is input to the U of sequential discriminator _OFInput; Second branch road forms the opposite U of phase place again with the 3rd branch road after phase shift, shaping, photoelectricity are isolated _OJSignal is received the U of sequential discriminator respectively _OF, U _OJ-Input.

(3) the zero sequence current signal circuit of above-mentioned all electric power incoming lines and outgoing after inserting from input socket CZ1 respectively, after filtering, amplitude discrimination, shaping, photoelectricity are isolated, is connected to the corresponding input of sequential discriminator;

(4) above-mentioned electric power incoming line U, W two-phase load current signal circuit after inserting from input socket CZ1 respectively, after filtering, shaping, photoelectricity are isolated, are attached to the corresponding input of sequential discriminator;

(5) above-mentioned sequential discriminator divides three groups of outputs, the drive circuit of first group of output line sending and receiving optical diode, the second winding control figure display circuit, the 3rd winding interface microcontroller; Export eight road signals for every group, two-way indication power line earth fault is arranged, one tunnel indication bus and the following outgoing earth fault of bus in eight road signals; Two-way is indicated the earth fault of concrete outgoing; Also have two-way to indicate the concrete running status of two electric power incoming lines (energising or power failure); One the tunnel to indicate this annular electrical network be dual power supply or single power supply (when a power supply has a power failure or maintenance).

2, peripheral circuit

(1) the residual voltage u of voltage transformer TV secondary open delta winding output _OSignal inserts the input socket CZ1 of " looped network single-phase grounding selecting module " and " the general single-phase grounding selecting module of outgoing " respectively after the small transformers step-down;

(2) zero sequence current mutual inductor TA on electric power incoming line and the two-way outgoing _OSecondary singal I _OAfter load resistance R does the I/V conversion, receive the corresponding input of " looped network sequential discriminator " respectively; The I of all the other outgoings _OSignal inserts " the general single-phase grounding selecting module of outgoing ".

(3) the accessory power outlet CZ2 of looped network single-phase grounding selecting module is connected with eight light-emitting diodes; Accessory power outlet CZ3 is connected with the digital display circuit and the voice alarm circuit of earth fault information; Accessory power outlet CZ4 connects with the STD bus of single-chip microcomputer, and single-chip microcomputer also can connect Chinese-character display, mini-printer and serial communication interface.

The good effect of the technical program is

1, adopt zero sequence first-harmonic sequential discriminating principle to carry out single-phase earth fault line selection, not only solve the single-phase earth fault line selection problem of distribution substation's outgoing in dual power supply electrical network or the operation with closed ring annular electrical network, and solved the failure line selection problem that single-phase earthing occurs in power line or bus; No matter and this electrical network is to belong to the isolated neutral electrical network, or neutral point can both be realized accurate failure line selection through high winding ground or through arc suppression coil earthing electric network.

2, the single-phase earth fault line selection with dual power supply net or operation with closed ring annular electrical network is divided into " the general single-phase grounding selecting of outgoing " and " the special-purpose single-phase grounding selecting of looped network " two parts, both utilized existing patent ZL200520080013.0, solved the common problem of outgoing single-phase grounding selecting easily, made the particularity problem of the single-phase earth fault line selection that occurs on duplicate supply looped network distribution substation power line and the bus give prominence to the key points, be easy to solve again.

Description of drawings

Fig. 1 is core by one " the special-purpose single-phase grounding selecting module of looped network ", adds the duplicate supply annular electrical network single-phase grounding selecting principle of device block diagram that " the general single-phase grounding selecting module of outgoing " constitutes;

Fig. 2 is " the special-purpose single-phase grounding selecting module of looped network " circuit theory diagrams among Fig. 1;

Fig. 3 is the composite type sequential discriminator circuit of power line single-phase earthing in the special-purpose single-phase grounding selecting module of looped network among Fig. 2;

Fig. 4 is the composite type sequential discriminator circuit of special-purpose single-phase grounding selecting module median generatrix of another kind of looped network and following each the outgoing single-phase earthing of bus.

Embodiment

The application's a embodiment now is described with Fig. 1, Fig. 2, Fig. 3.

Present embodiment is mainly used to guard the single phase ground fault of electric power incoming line, and core devices is the special-purpose sequential discriminator of looped network VC1.

" the general single-phase grounding selecting module of outgoing " and peripheral circuit among Fig. 1, identical with " single-phase grounding selecting module " principle of compositionality in the patent ZL200520080013.0 resonant earthed system single-phase grounding selecting device, mode of connection is similar no longer to be described in detail.

Among Fig. 1, also comprise looped network single-phase grounding selecting module (as shown in Figure 2), and small transformers ST.U _OOutput line inserts the CZ1 socket of looped network single-phase grounding selecting module, the zero sequence current mutual inductor secondary singal I of two-way power line and two-way outgoing after transformer ST step-down _OAfter the I/V conversion, also insert the CZ1 socket, the CZ2 socket of looped network single-phase grounding selecting module is connected to each branch road luminous tube LED indication respectively, and the CZ3 socket of looped network single-phase grounding selecting module is received the digital display circuit and the voice alarm circuit of earth fault line respectively; The CZ4 socket is received single-chip board through STD BUS (bus), by print record, Chinese character demonstration and the serial communication of single-chip board control fault information.

In the looped network single-phase grounding selecting module shown in the accompanying drawing 2, constitute the sequential discriminator by an application-specific integrated circuit (ASIC) VC1 (ASIC), the sequential discriminator comprises the sequential discriminator circuit (detailed circuit as shown in Figure 3, Figure 4) of a plurality of different functions.The input of VC1 inserts bus U from CZ1 _OHolding wire, U _OPhase shift that signal line passes is total and filter circuit (forming) by W1, R14, R15, R16 and C5, C6, IC5-2, be divided into three branch roads then: first branch road passes through phase-shift circuit (being made up of W2, R7, R8, R9, C3, C4 and IC5-1), amplitude discrimination and shaping circuit (being made up of R10, R11 and IC6), light successively every coupling circuit (being made up of R12, R13 and IC7-1), electrically connects back output U _OFSignal inserts No. 45 pins of application-specific integrated circuit (ASIC) VC1; Second branch road successively through shaping circuit (forming), light by R17, R18 and IC5-3 every coupling circuit (forming) by R19, R20 and IC7-3, electrically connect back output U _OF+Signal inserts No. 47 pins of application-specific integrated circuit (ASIC) VC1; The 3rd branch road successively through shaping circuit (forming), light by R21, R22 and IC54 every coupling circuit (forming) by R23, R24 and IC7-2, electrically connect back output U _OJ-Signal inserts No. 46 pins of application-specific integrated circuit (ASIC) VC1; The input of VC1 also inserts two-way power line zero sequence current signal I respectively from socket CZ1 _OI, I _OIIHolding wire, two-way outgoing zero-sequence current I _O1, I _O2Holding wire and two-way power line load current I _UI, I _WI, I _UII, I _WIIHolding wire every circuit (wherein the load current signal saves the amplitude discrimination link), inserts 37～40 and 48～51 8 pins of application-specific integrated circuit (ASIC) VC1 through separately filtering, amplitude discrimination, shaping, light respectively after electrically connecting; 71～No. 78 pins of VC1 connect each pin of accessory power outlet CZ3 respectively; 11～No. 18 pins of VC1 connect each pin of accessory power outlet CZ4 respectively; 53～60 pins of VC1 connect 01～08 pin of integrated circuit 2803 drivers (IC9), and 11～18 pins of IC9 are received socket CZ2 through resistance R 27 respectively; 35 pins of VC1 connect decoder (IC10) through double contact pin CZ5, No. 5 pins of IC10 are through No. 15 pins of double contact pin CZ6 access decoder IC11, and

1,2,3,4,6 pins of IC10 and 1,2,3,4,5, No. 6 pin of IC11 are received STD bus; No. 32 pins of VC1 are received 03 pin of NE555 (IC8); 33 pins of VC1 connect positive 5V power supply and receive STD bus through socket CZ7 through socket CZ8 and R28; The pin of CZ1 socket R3 is connected to 52 pins of VC1.

What need further specify is, comprises the sequential discriminator circuit of a plurality of difference in functionalitys in sequential discriminator VC1 circuit, is divided into three types of outgoing, electric power incoming line and buses by the function difference.

The aufbauprinciple of electric power incoming line composite type sequential discriminator circuit is described according to Fig. 3 below.

Input signal I among Fig. 3 _OI, I _OII, U _OI+, U _OI-With

chip VC1 pin

51,48,47, the 46 corresponding connections in the accompanying drawing 2, when single phase ground fault takes place in power circuit dyI (high level is effective), sequential discriminator circuit output signal, the signal of output divides three branch roads again, respectively output pin 78 pin yin-dyI, 53 pin LDE-dyI, the 11 pin JSJ-dyI of map interlinking 2 chips VC1.

Fig. 4 is " the composite type sequential discriminator circuit " that is used to detect bus or following each the road outgoing generation single phase ground fault of bus, and the structural principle among it and Fig. 3 is basic identical, only is with the U among Fig. 3 _OI-signal changes U into _OI+, its output indication single phase ground fault occur in that bus mx goes up or each outgoing of bus subordinate on (each outgoing has the sequential discriminator circuit of failure line selection separately respectively).

Claims

1. a duplicate supply looped network single-phase earthing sequential is differentiated line selection apparatus, outgoing single-line ground route selection module and peripheral circuit that it comprises, and its feature also comprises:

(1) looped network single-phase grounding selecting module, this module is by the sequential discriminator, the residual voltage signal circuit of bus, the zero sequence current signal circuit of two-way electric power incoming line, at least two-way outgoing zero sequence current signal circuit, the load current signal circuit of two-way electric power incoming line U, W two-phase and output circuit are formed; Wherein:

1. above-mentioned sequential discriminator constitutes by being provided with time sequence logical discrimination logical circuit or single-chip microcomputer then, and logical circuit can be with complex programmable logic device (CPLD) or application-specific integrated circuit ASIC;

2. above-mentioned residual voltage signal circuit is after picking out from input socket CZ1, earlier through total phase shift and filtering, then divides three branch roads, and first branch road forms U again after phase shift, amplitude discrimination, shaping, photoelectricity are isolated _0FSignal is input to the U of sequential discriminator _0FInput; Second branch road forms the opposite U of phase place again with the 3rd branch road after phase shift, shaping, photoelectricity are isolated _0JSignal is received the U of sequential discriminator respectively _0J+, U _0J-Input;

The zero sequence current signal circuit of 3. above-mentioned all electric power incoming lines and outgoing after inserting from input socket CZ1 respectively, after filtering, amplitude discrimination, shaping, photoelectricity are isolated, is connected to the corresponding input of sequential discriminator;

4. above-mentioned electric power incoming line U, W two-phase load current signal circuit after inserting from input socket CZ1 respectively, after filtering, shaping, photoelectricity are isolated, are attached to the corresponding input of sequential discriminator;

5. above-mentioned sequential discriminator divides three groups of outputs, the drive circuit of first group of output line sending and receiving optical diode, the second winding control figure display circuit, the 3rd winding interface microcontroller; Export eight road signals for every group, two-way indication power line earth fault is arranged, one tunnel indication bus and the following outgoing earth fault of bus in eight road signals; Two-way is indicated the earth fault of concrete outgoing; Also have two-way to indicate the concrete running status of two electric power incoming lines; One the tunnel to indicate this annular electrical network be dual power supply or single power supply;

(2) peripheral circuit

1. the residual voltage u of voltage transformer TV secondary open delta winding output ₀Signal inserts the input socket CZ1 of " looped network single-phase grounding selecting module " and " the general single-phase grounding selecting module of outgoing " respectively after the small transformers step-down;

2. zero sequence current mutual inductor TA on electric power incoming line and the two-way outgoing ₀Secondary singal I ₀After load resistance R does the I/V conversion, receive the corresponding input of " looped network sequential discriminator " respectively; The I of all the other outgoings ₀Signal inserts " the general single-phase grounding selecting module of outgoing ";

3. the accessory power outlet CZ2 of looped network single-phase grounding selecting module is connected with eight light-emitting diodes; Accessory power outlet CZ3 is connected with the digital display circuit and the voice alarm circuit of earth fault information; Accessory power outlet CZ4 connects with the STD bus of single-chip microcomputer, and single-chip microcomputer also can connect Chinese-character display, little P type printer and serial communication interface.