CN103675554A - Standby power source automatic switching device tester - Google Patents
Standby power source automatic switching device tester Download PDFInfo
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- CN103675554A CN103675554A CN201310727377.2A CN201310727377A CN103675554A CN 103675554 A CN103675554 A CN 103675554A CN 201310727377 A CN201310727377 A CN 201310727377A CN 103675554 A CN103675554 A CN 103675554A
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Abstract
The invention discloses a standby power source automatic switching device tester. According to the standby power source automatic switching device tester, a PLC (Programmable Logic Controller) or a single-chip serves as a control core, and the inner part is integrated with two paths of three-phase adjustable voltage sources, a path of a single-phase voltage source and a path of a single-way current source; a position acquisition unit acquires switch position information; an analogue switch module correspondingly provides necessary switch trip and switch-on position; a dynamic test model is established and a running mode and a test scheme are determined by giving comprehensive consideration to a wiring way of on-site operation of a transformer substation, equipment parameters and primary performance indexes of spare power automatic switching devices in various factories; the test model, the running mode and the test scheme are stored in the PLC or the single-chip through programming; during the test, an operator only needs to access relevant signal terminals of a spare power automatic switching device to a standby power source test interface arranged on a back panel of an instrument and select the running mode for implementation, and the following steps are finished automatically according to program design. The standby power source automatic switching device tester is small in volume, low in cost and convenient in operation, and achieves wide popularization and application values.
Description
Technical field
The invention belongs to electric system test unit technical field, particularly a kind of automatic switching device of standby power supply test instrument.
Background technology
Along with the development of electric system, and the raising of power consumer to the requirement of power department power supply reliability, automatic switching device of standby power supply is put in system and is moved in a large number, and the check work of backup auto-activating device also significantly increases thereupon.At present, when regular inspection is tested, there are some problems in backup auto-activating device, main as follows: in existing backup auto-activating device pilot system, required test signal is generally by chip controls protection test device output AC electric current, voltage analog, by separate analogue isolating switch, provide switching value, by time tester, test backup auto-activating device actuation time, these equipment volume are large, it is loaded down with trivial details to operate, wiring is complicated; Existing backup auto-activating device is variant from different manufacturers, performance, and adjustment method is also different, has increased the complicacy of experiment work; The at present domestic logic of conventionally just carrying out demo plant itself by envelope test, seldom considers a problem from the angle of electrical network, causes backup auto-activating device performance factor lower.Traditional standby power switchover device adopts relay logic, has the shortcomings such as secondary connection complexity, function ossify, and especially, when the plant stand method of operation changes, easily causes incorrect operation; Tradition electromagnetic type backup auto-activating device is the logical circuit that uses relay to form, if for a certain Main connection form, has set one of them switch for permanent standby cultellation, can take out fairly simple reliable prepared auto restart loop with relay.But for the actual method of operation, power transmission under a kind of mode forever, with respect to the dirigibility of electrical network, the shortcoming that backup auto-activating device of traditional electromagnetic type exists is very important; At this moment, because what prepared auto restart was faced is a series of isolating switchs, on screen, be difficult to install enough relays, at this moment only have two kinds of selections, a kind of is the automatic switching scope of dwindling, power transmission in time in the time of will causing certain section of bus power-off like this, another kind of selection is exactly to disperse to install relay, at screen, relay is installed behind or on the even adjacent screen of its underpart crosspiece, is made a set of circuit connection more complicated, bring great inconvenience to normal management.CN 101893665 A disclose a kind of experimental instrument for automatic switching device of standby power supply, the mode of comprising selects to control executive circuit, electric current and voltage output control circuit, analog switch and display circuit, it also comprises that control module circuit, three-phase voltage form circuit and power ascension circuit, and control module circuit comprises integration module, three-phase supply, voltage amplification, electric capacity, resistance; Power ascension circuit comprises amplifier, variable resistor, electric capacity, electrochemical capacitor, resistance, transformer, voltage input, reometer; Three-phase voltage forms circuit and comprises transformer Ta, Tb, Tc, voltage table BV.But described experimental instrument for automatic switching device of standby power supply functional mobility is not fine, and the scope of application is little, reply different manufacturers product needed is changed the new circuit of debugging, and stability can not guarantee.
Summary of the invention
The object of the invention is to address the above problem, and a kind of automatic switching device of standby power supply test instrument esy to use, safe and reliable is provided.
To achieve these goals, the technical solution used in the present invention is: a kind of automatic switching device of standby power supply test instrument, it comprises mode adaptive module, electric current and voltage source module, analog switch module and the kernel control module that is arranged at tool housing inside, described mode adaptive module comprises the station acquisition element and the transfer circuit that is connected described kernel control module that is arranged at the position of the switch, and described electric current and voltage source module comprises two-way three-phase variable voltage source, a unidirectional current source, single-phase electricity potential source He Yi road, road.
Described kernel control module is set to single-chip microcomputer or PLC.
Described analog switch module switch trip that providing of instrument internal setting is necessary is provided, closes the analog switch of rear position, and described analog switch is set to 3 groups.
Described tool housing front panel arranges pilot lamp, the mode of the described kernel control module of connection and selects button and power switch.
Described tool housing rear panel arranges standby power supply test interface.
Described station acquisition element is set to linear displacement transducer.
As the present invention, further improve, described analog switch is set to 3-7 group.
Principle of work of the present invention and technical essential are as follows:
(1) main wiring mode and prepared auto restart function
In electric system, the method for operation of primary system may change as required.For self-adaptation primary system, prepared auto restart also has the multiple method of operation, but all follows following general provisions:
(a). working bus bar decompression (non-PT broken string causes);
(b). the isolating switch that tripping is connected with former working power, in order to avoid standby power supply closes a floodgate in fault;
(c). check that whether standby power supply is qualified, the isolating switch that the working bus bar that closes as met the demands is connected with standby power supply;
(d). prepared auto restart only moves once.
Prepared auto restart the most common applicable main wiring mode is known technology, repeats no more here: be known as arbitrary phase voltage that UX1 and UX2 represent inlet wire; IX1 and IX2 represent the arbitrary phase current of inlet wire; UI, UII are one section of bus and two sections of busbar voltages; 1DL, 2DL, 3DL are the isolating switch in system.
Under this mode of connection, have three kinds of possible methods of operation, thereby also just have three kinds of prepared auto restart modes.Described in specific as follows:
The first method of operation: 3DL is in open position, and I, II section bus splitting, respectively by inlet wire 1, inlet wire 2 power supplies.Under this method of operation, if inlet wire 1 fault causes I section bus loss of pressure, now backup auto-activating device should be able to disconnect operating circuit breaker 1DL automatically, and then drops into block switch 3DL, and bus I is restored electricity.Vice versa.
The second method of operation: 1DL and 3DL are in closing position, and 2DL disconnects.During normal operation, by inlet wire 1, give two bussed supplies.Under this method of operation, if inlet wire 1 fault causes two sections of equal decompressions of bus, now backup auto-activating device should be able to disconnect operating circuit breaker 1DL automatically, and then drops into 2DL, makes inlet wire 2 to bussed supply.
The third method of operation is similar to the second, when normal, by inlet wire 2, is worked, and inlet wire 1 is standby.For old-fashioned electromagnetic type backup auto-activating device, the standby functions simultaneously completing under above three kinds of methods of operation is quite difficult, the microcomputer type auto-switch-on device of producing for some producers, and it generally also can only complete wherein one to two kind of function.As long as the present invention has enough intakes and analog quantity information, utilize 80C196 singlechip chip or PLC, just can complete various prepared auto restart functions.
(2) the mode adaptive module method of operation
The present invention is mainly that the difference of each circuit breaker position is judged according in main electrical scheme system.Due under the given method of operation, each switch folding position that prepared auto restart is controlled is certain, thereby can, by gathering the state of the position of the switch, complete the identification to prepared auto restart operational mode.In this case, for workmen, only relative breaker position contact need be connected on device, and not need to carry out numerous and diverse secondary connection.Because the basis of mode adaptive identification is exactly various switching values, therefore the correctness of switching value, whether adhesion is most important for contact.Therefore in conjunction with the current and voltage quantities gathering, various circuit breaker position switches are monitored.
(3) prepared auto restart only moves once: a technology emphasis of the present invention is how to guarantee that prepared auto restart only moves once.
In traditional wired, we can guarantee the requirement that prepared auto restart only moves once by the method for hard contact cutoff circuit artificial involution.The present invention has quoted the concept of " charging ", uses the charging problem of similar circuit re-switching to solve.When current system terms and conditions meets prepared auto restart permission input, making prepared auto restart charged state is 1, only have charged, when when the system failure, standby power supply could drop into, and after in-put of spare power supply, prepared auto restart automatic discharging, until Failure elimination, the satisfied condition of next time hauling oneself willingly into just can continue charging.So just reached the object that prepared auto restart can only move once.
After solving an above-mentioned difficult problem, just entered various Functional Designs after the described kernel control module software programming stage:
As the present invention, further improve, the present invention realizes PT burn out detection function by programming.
As the present invention, further improve, the present invention realizes overload cutoff function and defencive function by programming.
As the present invention, further improve, the present invention realized increase intake by programming and controlled function.
Beneficial effect of the present invention: it is control core that automatic switching device of standby power supply test instrument of the present invention be take PLC or single-chip microcomputer, inside is integrated with two-way three-phase variable voltage source, one unidirectional current source, single-phase electricity potential source He Yi road, tunnel, by station acquisition unit, gather after the information of the position of the switch, the described analog switch module correspondence also designing in instrument internal provides necessary switch trip, close rear position, test instrument considers substation field operation wiring mode, the main performance index of device parameter and various producers backup auto-activating device, set up dynamic test model and determine the method for operation and testing program, by this test model, the method of operation and testing program deposit in PLC or monolithic by programming, during test, operating personnel only need access the coherent signal terminal of backup auto-activating device the standby power supply test interface that described tool housing rear panel arranges, selection operating modes for performing, step completes according to program design automatically by test instrument later.The present invention can improve function by setting program, meets bus loss of pressure, is subject to power supply without conditions such as streams, and mimic-disconnecting switch divide-shut brake is malfunctioning, empty moving, the PT broken string of isolating switch, frequency shift (FS), developing fault, intermittent defect etc.The present invention can move automatically according to the testing program of each automatic bus of various producers, solve the debugging work of on-the-spot different manufacturers product complexity, and can carry out comparatively comprehensive dynamic and static Performance to backup auto-activating device, avoided the incorrect operation causing after backup auto-activating device input coefficient, for safe and stable operation and the reliable power supply of electrical network are given security.Instrument volume of the present invention is little, and cost is low, easy to operate, has wide popularization and application and is worth.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described:
Fig. 1 is structural principle schematic diagram of the present invention;
Fig. 2 is the applicable common main wiring mode of prepared auto restart;
Fig. 3 is the logic diagram of backup auto-activating device of the present invention;
Fig. 4 is the process flow diagram of backup auto-activating device of the present invention.
Embodiment
As described in Figure 1, a kind of automatic switching device of standby power supply test instrument, it comprises mode adaptive module, electric current and voltage source module, analog switch module and the kernel control module that is arranged at tool housing inside, described mode adaptive module comprises the station acquisition element and the transfer circuit that is connected described kernel control module that is arranged at the position of the switch, and described electric current and voltage source module comprises two-way three-phase variable voltage source, a unidirectional current source, single-phase electricity potential source He Yi road, road.
Described kernel control module is set to PLC.
Described analog switch module switch trip that providing of instrument internal setting is necessary is provided, closes the analog switch of rear position, and described analog switch is set to 3 groups.
Described tool housing front panel arranges pilot lamp, the mode of the described kernel control module of connection and selects button and power switch.
Described tool housing rear panel arranges standby power supply test interface.
Described station acquisition element is set to linear displacement transducer.
As the present invention, further improve, described analog switch is set to 3-7 group.
Principle of work of the present invention and technical essential are as follows:
(1) main wiring mode and prepared auto restart function
In electric system, the method for operation of primary system may change as required.For self-adaptation primary system, prepared auto restart also has the multiple method of operation, but all follows following general provisions:
(a). working bus bar decompression (non-PT broken string causes);
(b). the isolating switch that tripping is connected with former working power, in order to avoid standby power supply closes a floodgate in fault;
(c). check that whether standby power supply is qualified, the isolating switch that the working bus bar that closes as met the demands is connected with standby power supply;
(d). prepared auto restart only moves once.
As shown in Figure 2, in figure, UX1 and UX2 represent arbitrary phase voltage of inlet wire to the common main wiring mode that prepared auto restart is suitable for; IX1 and IX2 represent the arbitrary phase current of inlet wire; UI, UII are one section of bus and two sections of busbar voltages; 1DL, 2DL, 3DL are the isolating switch in system.
Under this mode of connection, have three kinds of possible methods of operation, thereby also just have three kinds of prepared auto restart modes.Described in specific as follows:
The first method of operation: 3DL is in open position, and I, II section bus splitting, respectively by inlet wire 1, inlet wire 2 power supplies.Under this method of operation, if inlet wire 1 fault causes I section bus loss of pressure, now backup auto-activating device should be able to disconnect operating circuit breaker 1DL automatically, and then drops into block switch 3DL, and bus I is restored electricity.Vice versa.
The second method of operation: 1DL and 3DL are in closing position, and 2DL disconnects.During normal operation, by inlet wire 1, give two bussed supplies.Under this method of operation, if inlet wire 1 fault causes two sections of equal decompressions of bus, now backup auto-activating device should be able to disconnect operating circuit breaker 1DL automatically, and then drops into 2DL, makes inlet wire 2 to bussed supply.
The third method of operation is similar to the second, when normal, by inlet wire 2, is worked, and inlet wire 1 is standby.For old-fashioned electromagnetic type backup auto-activating device, the standby functions simultaneously completing under above three kinds of methods of operation is quite difficult, the microcomputer type auto-switch-on device of producing for some producers, and it generally also can only complete wherein one to two kind of function.As long as the present invention has enough intakes and analog quantity information, utilize PLC just can complete various prepared auto restart functions.
(2) the mode adaptive module method of operation
The present invention is mainly that the difference of each circuit breaker position is judged according in main electrical scheme system.Due under the given method of operation, each switch folding position that prepared auto restart is controlled is certain, thereby can, by gathering the state of the position of the switch, complete the identification to prepared auto restart operational mode.In this case, for workmen, only relative breaker position contact need be connected on device, and not need to carry out numerous and diverse secondary connection.Because the basis of mode adaptive identification is exactly various switching values, therefore the correctness of switching value, whether adhesion is most important for contact.Therefore in conjunction with the current and voltage quantities gathering, various circuit breaker position switches are monitored.In main electrical scheme shown in Fig. 2, how the first kind of way of take carries out pattern as example explanation is identified automatically, and detailed process is as follows:
Device ceaselessly detects the position contact of 1DL, 2DL, 3DL, if 1DL, 2DL are co-bit, 3DL is for opening position, and after stablizing and continuing for some time, automatically thinks in " inlet wire 2 is standby " mode.When the position of the switch does not meet the demands, after continuing for some time, pattern is automatically changeb to other types, or thinks that not meeting prepared auto restart drops into condition, and prepared auto restart is out of service; The pattern-recognition certainly property status of taking the lead in whole prepared auto restart action logic, its pattern-recognition time should be slightly longer, and condition should be stricter.The present invention was set to for 28-30 seconds; In above-mentioned identifying, the above three kinds of methods of operation of order are followed successively by mode 1, mode 2, mode 3, and abnormal running pattern is called mode 0 without exception.Design the logic diagram of backup auto-activating device of the present invention as shown in Figure 3.
(3) prepared auto restart only moves once: a technology emphasis of the present invention is how to guarantee that prepared auto restart only moves once.
In traditional wired, we can guarantee the requirement that prepared auto restart only moves once by the method for hard contact cutoff circuit artificial involution.The present invention has quoted the concept of " charging ", uses the charging problem of similar circuit re-switching to solve.When current system terms and conditions meets prepared auto restart permission input, making prepared auto restart charged state is 1, only have charged, when when the system failure, standby power supply could drop into, and after in-put of spare power supply, prepared auto restart automatic discharging, until Failure elimination, the satisfied condition of next time hauling oneself willingly into just can continue charging.So just reached the object that prepared auto restart can only move once.
The present invention be take the method for operation 2 as example, and its charge condition of process flow diagram of designing backup auto-activating device of the present invention as shown in Figure 4 can be:
(1) two sections of bus UI of low pressure, UII three-phase all have pressure, and standby power supply UX2 has pressure;
(2) switch 1DL, 3DL are co-bit, and 2DL is a minute position.
Discharging condition is:
(1) hand is jumped 1DL;
(2) intake " prepared auto restart electric discharge " is 1;
(3) arbitrary low-voltage bus bar decompression, or inlet wire standby power supply UX2 is with no pressure.
Wherein, discharging condition 1 and 2 is instantaneous discharge, and condition 3 can postpone a period of time electric discharge.The 1st, when by the manual TRIP of operating personnel, the situation of prepared auto restart malfunction, and 2 be after some protection (such as bus differential protection) action, used while needing locking prepared auto restart.Must be greater than the prepared auto restart open hour time delay of condition 3 electric discharges, in order to avoid there is the situation that prepared auto restart has not moved with regard to discharging.
After solving an above-mentioned difficult problem, just entered various Functional Designs after the described kernel control module software programming stage:
As the present invention, further improve, the present invention realizes PT burn out detection function by programming.
For prepared auto restart, must there is the function that detects three-phase PT broken string, otherwise prepared auto restart will malfunction.In addition, prepared auto restart is also tackled single-phase PT broken string work to detect, to remind operator on duty; Various protections have the algorithm of the inspection PT broken string of oneself, switching value criterion of the present invention:
(1) 1# inlet wire line side voltage U X1 has pressure;
(2) 1DL isolating switch is closure state;
(3) the female voltage U I of I three-phase is with no pressure.
Above condition all meets, and after certain time-delay, can be judged to three-phase PT broken string.
As the present invention, further improve, the present invention realizes overload cutoff function and defencive function by programming.
Utilize the single-phase current of inlet wire circuit, can after prepared auto restart drops into, electric current be detected in real time, outlet overload cutoff; In addition, can also input the three-phase current on block switch, electric current is carried out to over-current detection; complete the simple protective function to block switch; in software, do with after processing, block switch protection can also be protected as busbar charging, only open and protection in short-term when busbar charging.
As the present invention, further improve, the present invention realized increase intake by programming and controlled function.
The present invention arranges the functions such as " switchover enabling ", " prepared auto restart electric discharge ", " acceleration prepared auto restart ", specific as follows:
(1) " switchover enabling ": for require just to allow the occasion of prepared auto restart action when specifying protection action, and other is under specified conditions, and prepared auto restart does not allow action.For example dark when standby two transformer capacities, if only require a main transformer main protection action just to allow the low pressure block switch that closes, in case be combined on fault outlet or fault bus, the output contact of main transformer main protection can be guided in this intake.
(2) " prepared auto restart electric discharge ": the situation that does not allow prepared auto restart action while being generally used for some protection action.For example, when the composite voltage locking overcurrent in main transformer backup protection moves, bus-bar fault, in many occasions, does not allow prepared auto restart action often, now should send out block signal to " prepared auto restart electric discharge " intake, in order to avoid cause prepared auto restart malfunction.
(3) " acceleration prepared auto restart ": in some protection action situation, prepared auto restart is without wait for (as the reclosing action of hiding) through conventional time delay.Now, in order restoring electricity as early as possible, can to provide protection interlock contact on this intake, prepared auto restart to be accelerated actuation time.
Beneficial effect of the present invention: it is control core that automatic switching device of standby power supply test instrument of the present invention be take PLC or single-chip microcomputer, inside is integrated with two-way three-phase variable voltage source, one unidirectional current source, single-phase electricity potential source He Yi road, tunnel, by station acquisition unit, gather after the information of the position of the switch, the described analog switch module correspondence also designing in instrument internal provides necessary switch trip, close rear position, test instrument considers substation field operation wiring mode, the main performance index of device parameter and various producers backup auto-activating device, set up dynamic test model and determine the method for operation and testing program, by this test model, the method of operation and testing program deposit in PLC or monolithic by programming, during test, operating personnel only need access the coherent signal terminal of backup auto-activating device the standby power supply test interface that described tool housing rear panel arranges, selection operating modes for performing, step completes according to program design automatically by test instrument later.The present invention can improve function by setting program, meets bus loss of pressure, is subject to power supply without conditions such as streams, and mimic-disconnecting switch divide-shut brake is malfunctioning, empty moving, the PT broken string of isolating switch, frequency shift (FS), developing fault, intermittent defect etc.The present invention can move automatically according to the testing program of each automatic bus of various producers, solve the debugging work of on-the-spot different manufacturers product complexity, and can carry out comparatively comprehensive dynamic and static Performance to backup auto-activating device, avoided the incorrect operation causing after backup auto-activating device input coefficient, for safe and stable operation and the reliable power supply of electrical network are given security.Instrument volume of the present invention is little, and cost is low, easy to operate, has wide popularization and application and is worth.
Claims (10)
1. an automatic switching device of standby power supply test instrument, it is characterized in that: it comprises mode adaptive module, electric current and voltage source module, analog switch module and the kernel control module that is arranged at tool housing inside, described mode adaptive module comprises the station acquisition element and the transfer circuit that is connected described kernel control module that is arranged at the position of the switch, and described electric current and voltage source module comprises two-way three-phase variable voltage source, a unidirectional current source, single-phase electricity potential source He Yi road, road.
2. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described kernel control module is set to single-chip microcomputer or PLC.
3. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described analog switch module switch trip that providing of instrument internal setting is necessary is provided, closes the analog switch of rear position, and described analog switch is set to 3 groups.
4. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described tool housing front panel arranges the pilot lamp, the mode that connect described kernel control module and selects button and power switch.
5. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described tool housing rear panel arranges standby power supply test interface.
6. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described station acquisition element is set to linear displacement transducer.
7. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: described analog switch is set to 3-7 group.
8. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: the present invention realizes PT burn out detection function by programming.
9. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: the present invention realizes overload cutoff function and defencive function by programming.
10. automatic switching device of standby power supply test instrument as claimed in claim 1, is characterized in that: the present invention realized increase intake by programming and controls function.
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| CN104901284B (en) * | 2015-04-16 | 2018-01-16 | 广东电网有限责任公司揭阳供电局 | Distance protection equipment three-phase PT wire break detection methods and faulty action preventing method |
| CN107918349A (en) * | 2017-11-27 | 2018-04-17 | 国网山东省电力公司聊城供电公司 | A kind of distribution network protection debugging apparatus and its method of work |
| CN112345960A (en) * | 2020-10-09 | 2021-02-09 | 国网江苏省电力有限公司淮安供电分公司 | Scene-type spare power automatic switching logic verification system and method |
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