CN201234125Y - Single-phase grounding failure automatic processing equipment for low current grounding system - Google Patents
Single-phase grounding failure automatic processing equipment for low current grounding system Download PDFInfo
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- CN201234125Y CN201234125Y CNU2008200409013U CN200820040901U CN201234125Y CN 201234125 Y CN201234125 Y CN 201234125Y CN U2008200409013 U CNU2008200409013 U CN U2008200409013U CN 200820040901 U CN200820040901 U CN 200820040901U CN 201234125 Y CN201234125 Y CN 201234125Y
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Abstract
A single-phase grounding fault automatic processing device for a small-current grounding system relates to the field of electric power system, in particular to the single-phase grounding fault automatic processing and control field for the small-current grounding system. The signal output terminal of a PT analog quantity input module is connected with a signal input terminal of an A/D conversion module; the signal output terminal of the A/D conversion module is connected with the first input terminal of a data buffer module; the first output terminal of the data buffer module is connected with the input terminal of a trip output module; the second output terminal of the data buffer module is connected with the input terminal of a blocking circuit protection reclosure output module; and the third output terminal of the data buffer module is connected with the input terminal of a host computer. The single-phase grounding fault automatic processing device can be used for compensating for the trip result simultaneously in combination with the automatic reclosure function in the circuit protection so as not to influence the users from the switch tripping to the closing of the protection reclosure switch when the tripped circuit is non-fault circuit.
Description
Technical field
The utility model relates to field of power, especially the automatic processing controls of single-phase grounded malfunction in grounded system of low current field.
Background technology
The low current grounding automatic route selection device that some comparative maturities are arranged in China, the principle method that each producer adopts has nothing in common with each other, sum up and get up to mainly contain two classes: the I class mainly is the fault amount that system produces when adopting line-to-ground fault, residual voltage as the bus generation, ground path zero-sequence current and non-ground path zero-sequence current and residual voltage are analyzed earth fault and are occurred in a certain circuit than equating method.The II class mainly is to utilize the external input signal method, is exactly to adopt the external equipment input signal source when system's generation earth fault, and by detecting every circuit feedback signal, analyzes earth fault and occur in a certain circuit.Though two kinds of method principles are different, it is exactly to select earth fault line earlier that a common ground is arranged, and sends the line-to-ground alarm signal then and notifies dispatcher and operations staff to handle.
More than the defective that exists of two class methods:
1, because in the complexity, particularly small current neutral grounding system of earth fault, when the short overall zero-sequence current of circuit hour, route selection result sometimes is inaccurate.Little electric current line selection apparatus once must be widely at home and apply the early stage nineties.But,, all withdrawed from operation in succession to most of line selection apparatus of the later stage nineties because the sensitivity and the accuracy rate of product are not high.Often because be in operation the dispatcher is taken place when drawing back respective lines by the route selection result, finding needs again circuit is served after incorrect, and front and back will have a power failure about 3 minutes, caused the unnecessary power failure to the user.
2, when dispatcher's operation task on duty was busy, electric substation was more because of administration, often can not in time find warning message, thereby incur loss through delay the processing time.Though earth fault can move 2 hours (when cable length more in short-term) about; but usually can cause the long-time overvoltage of system to cause that bus PT damages; simultaneously may cause that another weak spot insulation breakdown of circuit develops into phase fault, enlarge fault coverage.
3, now electric substation all carries out unattended pattern, can't straighforward operation when communication network failure, and the operations staff need arrive the electric substation scene and draw back faulty line, though can isolated fault, incured loss through delay fault handling time.
Summary of the invention
The utility model purpose provide a kind of can cooperate simultaneously in the route protection the automatic reclosing function to the tripping operation result remedy, when institute's jumping circuit is non-fault line, overlap the switch combined floodgate and had only for 2 times in second, the user is not impacted basically from switch trip to protection; Capacitor does not adopt reclosing to remedy, by the single-phase grounded malfunction in grounded system of low current automatic processing device of manual reversion.
The utility model adopts following technical scheme for achieving the above object:
The signal output part of PT analog quantity input module of the present utility model is connected with the signal input part of A/D conversion module, and the system parameters analog quantity of PT analog quantity input module collection is converted to digital quantity; The signal output part of A/D conversion module is connected with the first input end of data buffering module, realizes buffered; The output of position of the switch input module is connected with second input of buffer module, realizes the switch position signal buffered; First output of data buffering module is connected with the input of tripping operation output module, realizes the trip protection to line switching; Second output of data buffering module is connected with the input of locking route protection reclosing output module, has realized the locking reclosing order to protection switch; The 3rd output of data buffering module is connected with the input of main frame, has realized the exchanges data of main frame and data buffering module; The first input end of main frame is connected with the output of 4M crystal oscillator, for main frame provides operating frequency; Second input of main frame is connected with the output of external trigger module, has realized software operation on request; The 3rd input of main frame is connected with the output of teledata delivery module, and the ground connection alarm signal is sent out; Main frame is connected with Keysheet module, LCD MODULE respectively, has realized the input of control signal and demonstration in real time.
The utility model adopts technique scheme, compared with prior art has following advantage:
1, all circuit microcomputer protecting devices of the utility model all have not corresponding startup reclosing function.
2, switch is in separating brake or closing position, because of switch is in high-voltage state, electric power system all is to differentiate by the position of the auxiliary contact of sense switch, auxiliary contact position and position of the switch strictness keep consistency, the auxiliary normal opened contact of switch just was in the branch position when switch was in the branch position, and auxiliary normally closed contact just is in and closes the position; The auxiliary normal opened contact of switch just was in and closes the position when switch was in and closes, and auxiliary normally closed contact just is in the branch position.
3, all 10kV, 20kV, 35kV circuit Microcomputer Protection all have two functions relevant with this device in the electric power system.1., can be the sub-gate circuit of the trip signal access of external protector or other automatics itself, line protective devices only need external protector or other automatics that a pair of idle contact is provided, power supply is provided by the power supply of route protection own.When external protector or other automatics idle contact closure; power supply will be connected the sub-gate circuit of protection by idle contact; split to close and trip; the purpose of doing like this is to avoid occurring same switch of the independent respectively control of many covering devices; cause wiring very complicated, simultaneously increased security risk.2., behind the line switching separating brake; the protective device of circuit own does not export tripping operation; do not exist artificial hand to jump (comprising straighforward operation) signal yet; can not receive the locking reclosing order of external protector or other automatics input simultaneously; the protective device of circuit own is thought switch jumping steathily, will start " not corresponding reclosing " and switch be closed after 2 seconds at switch trip.
4, capacitor switch protective device in the electric power system is not with the reclosing function.Because explanation is that capacitor or cable etc. break down certainly behind the capacitor protection would trip, do not exist on the similar circuit thunderbolt to wait the transient fault need be once to the switch coincidence.All capacitor protections do not use the reclosing function.
This fault signature amount of zero sequence overvoltage that bus produced when compared with prior art, the utility model was earth fault is as the unique characteristic quantity that trips, the fault actions amount of zero sequence overvoltage as all line trippings.Do not adopt the route selection thinking, the zero sequence overvoltage value (is generally got 40V～60V), and is reached delay requirement, just circuit is tripped, cooperate the automatic reclosing function in the route protection that the tripping operation result is remedied simultaneously greater than operating value; Capacitor does not adopt reclosing to remedy, by manual reversion.This device is grounded the function of the automatic trip isolation of fault, to handling rapidly in real time of earth fault, has ensured the safe and stable operation of non-failure system.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model device mainly contains following functional module.PT analog quantity input module 1 is responsible for the acquisition system alternating-current parameter; A/D conversion module 2 is responsible for analog quantity is converted to digital quantity; Whether truly position of the switch input module 4 is responsible for the input switch position signalling, allows the switch of device identification corresponding line be in minute position or to close the position, as judging the switch foundation of tripping operation behind the device output trip signal.Prevent switch generation tripping, cause device mistake to be judged as switch trip, ground connection still exists and jumps off a circuit; Tripping operation output module 5 is responsible for line switching output trip signal; Locking route protection reclosing output module 6 is responsible for avoiding the protective device output reclosing order of switch to run the pass jointly to installing the protective device output locking reclosing order of correct tripping operation back to institute's TRIP; Data buffering module 3 is responsible for inputoutput data is carried out buffered; Main frame and software control procedure 7 are responsible for providing related hardware support and software analysis to handle; 4M crystal oscillator 8 is responsible for providing operating frequency; Single step, software, external trigger module 9 are responsible for carrying out on request software and are carried out control; Teledata delivery module 10 is responsible for output ground connection alarm signal and is delivered to related user terminal by telemechanical apparatus; Keyboard portion 11 provides the Artificial Control terminal; Liquid-crystal display section 12 provides the manual read to check.
The utility model device has adopted multithreaded architecture in programming, after the device start detection, start the sampling thread, after number that residual voltage surpasses threshold value reaches some, the storage Temporal Data, and send message a, store steady state data then, and send message b, main thread is received message a, carry out failure wave-recording behind the b and fault message is shown to forms, through time-delay in 2 minutes, reach some as residual voltage less than the number of threshold value after, the sub-thread of sampling will send message c to main thread, receive message c as main thread during this period of time, proof earth fault disappears, and device is removed ephemeral data, automatically resets; Do not receive message c as main thread during this period of time, device will drive the tripping operation outlet and jump article one circuit, after trip signal sends 0.8 second, whether sense switch trips, and does not trip as switch, and device jumps off a circuit with outlet, send out article one line switching and refuse to jump signal, and repeat above process; As switch tripping, as 0.5 second during this period of time in main thread do not receive message c, device is not exported latch-up protection reclosing order (protective device will overlap switch), device exports and jumps off a circuit; As 0.5 second during this period of time in main thread receive message c, prove that fault disappears, institute's jumping circuit is exactly an earth fault line, device will export locking reclosing order (latch-up protection coincidence switch), device removing ephemeral data automatically resets.
The utility model this fault signature amount of zero sequence overvoltage that bus produces during earth fault is as unique characteristic quantity of tripping operation, the fault actions amount of zero sequence overvoltage as all line trippings.Do not adopt comparison zero-sequence current and residual voltage phase relation, select faulty line.Because in less distribution network, the zero-sequence current of faulty line and non-fault line is all less, because the zero-sequence current amplitude is less, add the complexity of most earth faults, the phase relation of the zero-sequence current of faulty line and non-fault line and bus residual voltage often is difficult for determining, faulty line and non-fault line be " uncertain " often, can cause the route selection mistake.After device is experienced bus and is produced residual voltage, press the pairing 1# of access device, 2#, 3# ... the order of N# circuit, 1# capacitor, 2# capacitor trips, and cooperates the automatic reclosing function in the route protection that the tripping operation result is remedied simultaneously; Capacitor does not adopt reclosing to remedy, by manual reversion.This device mainly comprises base plate, mainboard, PT filter band, data collecting card, position of the switch tablet, digital output module, tripping operation output module, locking reclosing output loop module, power of alterating and direct current, liquid crystal large-screen, keyboard, metal cabinet etc.The position of the switch input module of the auxiliary contact access device of the position of the switch, the tripping operation outlet of device inserts the sub-switching operation loop of protection, and device locking reclosing output loop inserts the outside locking reclosing of protective device input circuit.It is characterized in that: this fault signature amount of zero sequence overvoltage that bus produces during earth fault is as unique characteristic quantity of tripping operation; do not adopt the route selection thinking; as long as there is the zero sequence overvoltage to reach delay requirement; just circuit is tripped; the device trip(ping) circuit is inserted the sub-gate circuit of protection; as the correct switch that trips truly trips, and (device is by position of the switch input module; can judge whether truly tripping operation of switch; prevent switch generation tripping; cause the device erroneous judgement to break) then install and detect less than the zero sequence overvoltage, export locking reclosing signal just for this line protective devices.As it is incorrect to trip, and then device still can detect the zero sequence overvoltage, does not just export locking reclosing signal, and protective device will start not corresponding reclosing function, splits to close and closes a floodgate once, and device will then jump off a circuit.As install jumping for capacitor switch, stop using because of all reclosing functions of capacitor, do not have locking reclosing problem.In the power distribution network that this device is specially adapted to must isolate rapidly earth fault.
Operation principle of the present utility model: input the utility model device after the bus residual voltage process PT conversion of system, voltage signal is through the further conversion of high accuracy PT, voltage signal input low pass filter is removed and is disturbed the voltage analog signal that output waveform is level and smooth; Device adopts AC 1820A data collecting card that voltage signal is sampled, and sampled data deposits register by PC/AT in bus.Position of the switch input is isolated back input PCL one 734 switching value cards 1 by the input of the switching value input terminal on the rear board through photoelectricity, delivers on the PC/AT bus.Industrial control computer mainboard adopts PCA 1, and it is responsible for calling the real time data line algorithm of going forward side by side from PC/AT in bus and handles; Trip signal sends PCL one 734 switching value cards 2 by PC/AT in bus simultaneously, and the switching value card is isolated the back through photoelectricity and inserted the protection trip(ping) circuit by the switching value lead-out terminal on the rear board.Correct as institute's jumping circuit; device will be exported the order of locking reclosing; the order of locking reclosing sends PCL one 734 switching value cards 3 by PC/AT in bus, and the switching value card is isolated the back through photoelectricity and inserted the outside locking reclosing of protective device input circuit by the switching value lead-out terminal on the rear board.Relevant informations such as fault directly show by LCD screen.As install jumping for capacitor switch, stop using because of all reclosing functions of capacitor, do not have locking reclosing problem.This device also is equipped with anti-deadlock watchdog circuit, has overcome the operating deadlock problem of industrial computer effectively; Device adopts modulator-demodulator and other computer to carry out serial communication, has realized the device telemanagement.
Be that example is analyzed with once concrete earth fault device isolated fault below:
So that No. 2 line-to-ground faults to take place is that example describes device isolated fault process in detail, and the two-dimensional array of the sub-thread creation 5000 * 32 of the sampling of program is quasi real time stored data, is filled with to cover legacy data afterwards from array top.Break down back (greater than 6 points of starting resistor) with preceding 100 points in fault point and back 100 points as Temporal Data, again with back 400 points as steady state data, these 600 somes submission main threads.After one second,, continue to extract 400 points and submit main thread to as steady state data if fault does not disappear.After main thread is received these data, think certain the bar line-to-ground fault that takes place, will carry out failure wave-recording and be shown to forms.After time-delay in 2 minutes; fault exists always; main thread will can not receive message c; device will be exported and jump the order of article one circuit; trip signal sends PCL one 734 switching value cards 2 by PC/AT in bus, and the switching value card is isolated the back through photoelectricity and inserted the protection trip(ping) circuit by the switching value lead-out terminal TZ1 on the rear board.Behind the switch trip; after trip signal sends 0.8 second during this period of time in; optical isolation board will detect the DL1 position of the switch and change (by being incorporated into branch); the tripping of proof Line 1 way switch; this moment, device can also detect the zero sequence overvoltage; main thread can not receive message c; device will not exported locking reclosing order (protective device will overlap circuit 1 switch); device will be exported and jump the order of second circuit; trip signal sends PCL one 734 switching value cards 2 by PC/AT in bus, and the switching value card is isolated the back through photoelectricity and inserted the protection trip(ping) circuit by the switching value lead-out terminal TZ2 on the rear board.Behind circuit 2 switch trips; after trip signal sends 0.8 second during this period of time in; optical isolation board will detect the DL2 position of the switch and change (by being incorporated into branch); prove No. 2 line switching trippings; device will detect less than residual voltage this moment; device will be exported the 2 protection reclosing orders of locking circuit; the order of locking reclosing sends PCL one 734 switching value cards 3 by PC/AT in bus; the switching value card is isolated the outside input locking reclosing loop of back by the protective device of the switching value lead-out terminal BS2 line attachment 2 on the rear board, latch switch reclosing through photoelectricity.Device shows that on the foreground No. 2 circuits are faulty line and relevant ground tripping information.After fault was tripped isolation, device detected residual voltage and is lower than the startup threshold values, and program is jumped out main thread, gets back to monitoring state.
It is characterized in that: this fault signature amount of zero sequence overvoltage that bus produces during earth fault is as unique characteristic quantity of tripping operation; do not adopt the route selection thinking; the zero sequence overvoltage value (is generally got 40V～60V) and is reached delay requirement greater than operating value; just circuit is tripped; the device trip(ping) circuit is inserted the sub-gate circuit of protection; as the correct switch that trips truly trips, and (device is by position of the switch input module; can judge whether truly tripping operation of switch; prevent switch generation tripping; cause the device erroneous judgement to break); as install detection less than residual voltage, just give this line protective devices output locking reclosing signal.As it is incorrect to trip, and then device still can detect residual voltage, does not just export locking reclosing signal, and protective device will start not corresponding reclosing function, splits to close and closes a floodgate once, and device will jump off a circuit.As install jumping for capacitor switch, stop using because of all reclosing functions of capacitor, do not have locking reclosing problem.In the power distribution network that this device is specially adapted to must isolate rapidly earth fault.
Claims (1)
1, single-phase grounded malfunction in grounded system of low current automatic processing device, it is characterized in that: the signal output part of PT analog quantity input module (1) is connected with the signal input part of A/D conversion module (2), and the system parameters analog quantity that PT analog quantity input module (1) is gathered is converted to digital quantity; The signal output part of A/D conversion module (2) is connected with the first input end (31) of data buffering module (3), realizes buffered; The output of position of the switch input module (4) is connected with second input (32) of buffer module (3), realizes the switch position signal buffered; First output (33) of data buffering module (3) is connected with the input of tripping operation output module (5), realizes the trip protection to line switching; Second output (34) of data buffering module (3) is connected with the input of locking route protection reclosing output module (6), has realized the locking reclosing order to protection switch; The 3rd output (35) of data buffering module (3) is connected with the input of main frame (7), has realized the exchanges data of main frame (7) with data buffering module (3); The first input end (71) of main frame (7) is connected with the output of 4M crystal oscillator (8), for main frame (7) provides operating frequency; Second input (72) of main frame (7) is connected with the output of external trigger module (9), has realized software operation on request; The 3rd input (73) of main frame (7) is connected with the output of teledata delivery module (10), and the ground connection alarm signal is sent out; Main frame (7) is connected with Keysheet module (11), LCD MODULE (12) respectively, has realized the input of control signal and demonstration in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200409013U CN201234125Y (en) | 2008-07-09 | 2008-07-09 | Single-phase grounding failure automatic processing equipment for low current grounding system |
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| CNU2008200409013U CN201234125Y (en) | 2008-07-09 | 2008-07-09 | Single-phase grounding failure automatic processing equipment for low current grounding system |
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| CN201234125Y true CN201234125Y (en) | 2009-05-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403700A (en) * | 2011-11-13 | 2012-04-04 | 珠海博威电气有限公司 | High-voltage switch control terminal grounding protection method |
| CN104377666A (en) * | 2013-08-16 | 2015-02-25 | 刘晓博 | High-speed trial wiring strategy for ground fault of electric power system and trial wiring circuit topology |
| CN107508262A (en) * | 2017-08-22 | 2017-12-22 | 云南电网有限责任公司电力科学研究院 | A kind of pole protection voltage acquisition circuit and transverter zero sequence over-voltage protection method |
| CN107727986A (en) * | 2017-09-06 | 2018-02-23 | 李晓明 | A kind of small current grounding failure wire selection system and method with emergency function |
-
2008
- 2008-07-09 CN CNU2008200409013U patent/CN201234125Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403700A (en) * | 2011-11-13 | 2012-04-04 | 珠海博威电气有限公司 | High-voltage switch control terminal grounding protection method |
| CN102403700B (en) * | 2011-11-13 | 2015-03-18 | 珠海博威电气有限公司 | High-voltage switch control terminal grounding protection method |
| CN104377666A (en) * | 2013-08-16 | 2015-02-25 | 刘晓博 | High-speed trial wiring strategy for ground fault of electric power system and trial wiring circuit topology |
| CN107508262A (en) * | 2017-08-22 | 2017-12-22 | 云南电网有限责任公司电力科学研究院 | A kind of pole protection voltage acquisition circuit and transverter zero sequence over-voltage protection method |
| CN107508262B (en) * | 2017-08-22 | 2019-05-28 | 云南电网有限责任公司电力科学研究院 | A kind of pole protection voltage acquisition circuit and inverter zero sequence over-voltage protection method |
| CN107727986A (en) * | 2017-09-06 | 2018-02-23 | 李晓明 | A kind of small current grounding failure wire selection system and method with emergency function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XIUQIAN POWER SUPPLY COMPANY, JIANGSU ELECTRIC POW Effective date: 20130122 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130122 Address after: 223900 No. 1 Changjiang Road, Sihong County, Jiangsu, Suqian Patentee after: Sihong Power Supply Company, Jiangsu Electric Power Co. Patentee after: Jiangsu Suqian Power Supply Company Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 223900 Sihong county power supply company, No. 1 Changjiang Road, Sihong County, Jiangsu Province Patentee before: Sihong Power Supply Company, Jiangsu Electric Power Co. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090506 |