Distribution system; especially for 35KV and following electric pressure system; it is usually by transformer station; the 10kV/20kV/35kV output bus, a plurality of primary equipments of carry on bus that are connected with transformer station are formed at interval; in order to monitor and protect primary equipment ruuning situation at interval; the at interval corresponding protective device of each primary equipment; protective device is in operation and self tends to occur following fault, as power panel fault, CPU board fault, open into leaving the plate fault, exchanging plate fault, sampling plate fault and liquid crystal board fault etc.
At present; after 35kV and the following electric pressure line protective devices fault; the concrete primary equipment that operating management department all needs earlier protective device to be protected is taked power down at interval; then failed equipment is taked to disappear and lack or the replacing processing; the main cause of its power failure is moved for primary equipment unprotect after avoiding the protective device fault; the potential power supply hidden danger that continues operation when a certain equipment interval unprotect is for when this interval outlet fault the time; the higher level protects overstep tripping, causes power supply area power failure in short-term or when long on a large scale.
According to DL/T 584-2007,3-110kV electric grid relay protection device moves the requirement of adjust regulation and State Grid Corporation of China's " power system relay protection device operational management regulation ", and any primary equipment all must not move under unshielded state.Mainly contain following shortcoming by the conventional treatment method that this requirement limited:
(1), need be to the operation that has a power failure at interval of the pairing primary equipment of failure protecting device, time and effort consuming, inefficiency;
(2), need have a power failure at interval to the pairing primary equipment of failure protecting device, if its power supply area in single power supply, then the power supply area power consumer must face the power failure risk, power supply enterprise faces liability for breach of contract equally;
(3), need have a power failure at interval to the pairing primary equipment of failure protecting device, if its be network system transformer station interconnection at interval, power system operating mode weakness then, the raising of electric power netting safe running risk.
Summary of the invention
The object of the invention provides and a kind ofly can replace failure protecting device; the interim basic defencive function of realizing an operational outfit of failure protecting device institute correspondence, thus need not the portable protective device of taking power down that failure protecting device is handled to concrete primary equipment.
In order to achieve the above object; the technical solution adopted in the present invention is: the portable protective device of charged processing after a kind of distribution network systems protective device fault; described distribution network systems comprises transformer station; export a plurality of primary equipments interval that bus is connected with transformer station; be used to monitor the corresponding primary equipment protective device of running status at interval; each described primary equipment comprises switch at interval; current transformer; the switch trip control loop; described current transformer primary side is associated with corresponding described switch outlet; its secondary side is connected with protective device by terminal board; described protective device output be connected with described switch trip control loop with output drive signal control described switch deciliter; described portable protective device comprises the electric current folder that is used to clamp on line between described Current Transformer Secondary side and the terminal board; be used to gather the sampling module that the electric current folder is gone up size of current; the control module that is connected with the sampling module output; the tripping relay that is connected with the control module output; described tripping relay is used for being connected with described switch trip control loop; when described protective device breaks down; described tripping relay drops under the driving of control module and being connected of switch trip control loop, so that portable protective device replaces described protective device to put into operation temporarily.
Optimally, it also comprises and is connected the tripping operation monitoring module that is used between described control module output and the switch trip control loop to monitor that described switch trip control loop is whether intact.Further, described tripping operation monitoring module by close a relay, with close the relay normally closed contact buzzer that is connected that is in series and form.
The present invention also provides a kind of charged processing method of above-mentioned portable protective device after distribution network systems protective device fault that adopt, and it comprises the steps:
(a), portable protective device is fed alternating current, carry out current ration and adjust, the current value of adjusting is consistent with the protective device current ration of circuit to be accessed;
(b), on the line between described Current Transformer Secondary side and the terminal board, pincers are gone into the electric current folder of described portable protective device, and current signal is introduced its sampling module;
(c), measure current signal with pincerlike phase meter and whether enter sampling module, if the tripping relay idle contact of portable protective device is inserted described switch trip control loop;
(d), confirm that tripping operation pressing plate two ends on the portable protective device do not have the heteropolarity current potential after, drop into this pressing plate, simultaneously the tripping operation pressing plate and the reclosing pressing plate of the protective device of disabling faulty;
(e), with primary equipment at interval in Current Transformer Secondary side protective current loop with measure current circuit short circuit on terminal board, and disconnect the brace in protective current loop;
(f), distribution network systems continues normal operation under portable protective device drops into, and overhaul, disappear scarce to failure protecting device.
After step (f); new protective device is inserted between terminal board and the brace; by importing test current to carry out fixed value adjusting to it; the corresponding short circuit sheet of the back dismounting Current Transformer Secondary side of adjusting; recover new protective device and the brace between the switch trip control loop, to introduce current signal to new protective device.
Measuring being connected between the tripping relay that disconnects portable protective device after tripping operation pressing plate, reclosing pressing plate two ends do not have the heteropolarity current potential and the switch trip control loop, so that portable protective device is out of service.
Owing to adopt technique scheme; the present invention has the following advantages: portable protective device of the present invention is after protective device breaks down; because the pairing primary equipment of failure protecting device has been taked the processing that do not have a power failure at interval; workflow is simplified; operating efficiency is improved, and the electric power netting safe running level is unaffected.
Below in conjunction with accompanying drawing, the preferred specific embodiment of the present invention is described:
Distribution network systems as shown in Figure 1; it is mainly by substation level; primary equipment wall and protective device are formed; wherein; substation level is mainly by transformer 11; the main transformer switch 12 that is connected with transformer 11 outputs; bus 13 is formed; the primary equipment wall comprises a plurality of; its carry is on bus 13; output is used for being connected to realize power supply with user load; each primary equipment comprises switch 21 at interval; the current transformer 22 that primary side is connected with switch 21 outlets; the secondary side of current transformer 22 is connected with protective device 3 by terminal board 23; between protective device 3 and switch 21, also be provided with switch trip control loop 4; in normal operation; the current signal of protective device 3 sample rate current instrument transformers 22; and compare with the setting current value; if electric current output is greater than setting value, then the work of driving switch tripping operation control loop is with the tripping operation of control switch 21.
After protective device 3 self breaks down; because primary equipment must have protection equipment to carry out Stateful Inspection and protection at interval; otherwise when this line fault, will cause the expansion of accident by the main transformer protection tripping operation; therefore; the invention provides a kind of portable protective device; it can replace protective device temporarily after failed equipment breaks down, make to form path between current transformer 22, portable protective device 5, switch trip control loop 4, to realize the control to switch 21.
Described portable protective device 5 mainly is made up of current clamp 51, sampling module 52, control module 53, tripping relay 54, and described current clamp 51 is used at the corresponding protection device line of forceps major between current transformer 22 and terminal board 23 that break down.Described sampling module 52 is used to adopt the current value on the current clamp 51.Described control module 53 is used for the current value that receives is handled, and compares with the setting current value of setting.Described tripping relay 54 is used for being connected with switch trip control loop 4, between portable protective device 5 and switch trip control loop 4, forming the break-make road, thereby to switch 21 control of tripping.
In the present embodiment, portable protective device 5 also comprises tripping operation monitor module 55, described tripping operation monitor module 55 mainly by close a relay 551, with close the buzzer 552 that a relay 551 is in series and form, see shown in Figure 3.
Described sampling module 52, control module 53, tripping relay 54 and tripping operation monitor module 55 are packaged into an instrument, it possesses input/output ports such as of ac input, program, definite value, switching value input, switching value output, DC power supply, abnormal alarm, simple in structure, be convenient for carrying use.
Principle composition to portable protective device is illustrated above, will be introduced its charged processing method below:
If certain primary equipment pairing protective device at interval breaks down, under the situation that does not need to have a power failure, carry out charged processing according to following steps:
(1), mancarried device is fed ac charging power supply, carry out fixed value adjusting;
(2), on the line between current transformer and the terminal board, with three pincerlike electric currents folders respectively pincers go into A, B, C three-phase protective electricity consumption streamline, the sampling circuit of mancarried device is introduced current signal;
(3), survey electric current with pincerlike phase meter and confirm that protective current correctly enters mancarried device, the self-check of device program starts simultaneously;
(4), mancarried device tripping relay idle contact is inserted the switch trip control loop;
(5), primary equipment switch accumulation power supply is at interval stopped using;
(6), confirm that tripping operation pressing plate two ends on the mancarried device do not have the heteropolarity current potential after, drop into pressing plate, mancarried device enters operating state;
(7), the tripping operation pressing plate of disabling faulty protective device and reclosing pressing plate;
(8), Current Transformer Secondary side protective current loop and measure current circuit short circuit and disconnect the brace in protective current loop on terminal board in will be at interval so that the current circuit of failure protecting device (referring to Fig. 2) out of service;
(9), failure protecting device is in dead status, can overhaul or change failure protecting device;
(10), after failure protecting device disappears and lack, carry out fixed value adjusting, transmission again.Its correctness can be judged by tripping operation pressing plate and the monitoring of reclosing platen potential;
(11), recovery and protection current circuit and measure the brace of current circuit on terminal board, connect the corresponding short circuit sheet of running current instrument transformer secondary side, failure protecting device is introduced the equipment operation current signal after disappearing and lacking again;
(12), pressing plate is not recovered after having the heteropolarity current potential, recovery switch accumulation power supply, normally operation after failure protecting device disappears and lacks in measurement tripping operation, reclosing pressing plate two ends;
(13), portable protective device is out of service;
So far, the charged work of treatment after the protective device fault finishes.
Adopt above-mentioned processing method, the present invention has following advantage:
(1), because the pairing primary equipment of failure protecting device has been taked processings that do not have a power failure at interval, the workflow simplification has improved operating efficiency;
(2), because the pairing primary equipment of failure protecting device has been taked the processing that do not have a power failure at interval, its primary equipment power supply area user need not to face the power failure risk, power supply enterprise also need not to face liability for breach of contract;
(3), because the pairing primary equipment of failure protecting device has been taked processings that do not have a power failure at interval, 35kV of taking into account system transformer station and following electric pressure circuit need have each other the interconnector of confession fully, then the electric power netting safe running level is unaffected;
(4), for protective device edition upgrading, power panel fault, CPU board fault, open into leaving the plate fault, exchanging most common failures such as plate fault, sampling plate fault, liquid crystal board fault; and protective device changes definite value; processing all can not have a power failure; significantly reduced owing to the influence of protective relaying device fault to the user, its economic benefit and social benefit are obvious.