CN102790426A - Improved spare power source automatic switch method for single bus sectionalized operation of power substation - Google Patents

Improved spare power source automatic switch method for single bus sectionalized operation of power substation Download PDF

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Publication number
CN102790426A
CN102790426A CN2012102208382A CN201210220838A CN102790426A CN 102790426 A CN102790426 A CN 102790426A CN 2012102208382 A CN2012102208382 A CN 2012102208382A CN 201210220838 A CN201210220838 A CN 201210220838A CN 102790426 A CN102790426 A CN 102790426A
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contactor
power supply
inlet wire
segmentation
section
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Chinese (zh)
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李大伟
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Baosteel Stainless Steel Co Ltd
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Baosteel Stainless Steel Co Ltd
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Abstract

An improved spare power source automatic switch method for single bus sectionalized operation of a power substation belongs to the field of power supply and distribution control. Line voltage of each power supply input line is acquired to be used as a control power supply of each inlet line contactor; and a normally-closed auxiliary connector of each inlet line contactor correspondingly accesses between a sectionalized contactor coil and the control power supply. Whether the voltage of an inlet line circuit is normal or not is checked by adopting a control logic that no voltage exists if the inlet line loses power; the spare power source automatic switch is realized by adopting a control logic that the voltages exists in the sectionalized contactor; after the voltage of a first power supply inlet line or second power supply inlet line is recovered to be normal, power supply of the inlet line end of a power-losing power supply is recovered by controlling a circuit switching knob through the inlet wire contactor, and thus the recover of the spare power source automatic switch by supplying power is achieved; and if the sectionalized contactor is switched into bus faults, the sectionalized contactor is immediately tripped and one switching of the spare automatic switch is ensured. According to the improved spare power source automatic switch method, a defect of mistaken action of spare automatic switch caused by faults of a voltage sampling circuit is avoided; and the spare power source automatic switch method is applied to the field of switching/removing control of spare power supplies for single bus sectionalized operation power substations with low-voltage power supply systems.

Description

A kind of improved electric substation sectionalized single busbar connection operation power supply prepared auto restart changing method
Technical field
The invention belongs to the control device or the control system field that supply distribution, relate in particular to a kind of control method that is used for urgent or stand-by power supply input/releasing.
Background technology
" prepared auto restart " device, i.e. automatic throw-in equipment of emergency power supply (or be called automatic switching device of standby power supply, custom abbreviates " prepared auto restart " as in the industry); Be the automatics of installing in order to improve power supply reliability in the electric power system,, ensure power supply continuously improving the power supply reliability of multiple feed load; Has important effect; Its effect is after working power failover or other reasons disappearance, promptly breaks off working power, and stand-by power supply is devoted oneself to work.
Continuous development along with industrial enterprise; Reliability requirement to electric power system is increasingly high, the sectionalized single busbar connection operational mode electric substation of twice supply lines especially, and power supply " prepared auto restart " has obtained extensive use; Behind main electrical breakdown; " prepared auto restart " control system automatically control puts stand-by power supply into operation fast, and the power supply capacity when improving electrical network greatly and normally moving has been guaranteed the reliability and the continuity of power supply; Along with power system development, the effect and the status of " prepared auto restart " device are more and more come important.
Traditional " prepared auto restart " function is followed following control logic principle basically:
1), when working bus bar " decompression " fault takes place when, " prepared auto restart " device starts;
2), the circuit breaker that is connected with former working power of " prepared auto restart " device tripping, in order to avoid stand-by power supply closes a floodgate in fault;
3), whether " prepared auto restart " device inspection stand-by power supply qualified, as the circuit breaker that working bus bar is connected with the auxiliary bus-bar power supply that then closes that meets the demands;
4), " prepared auto restart " device is provided with " post acceleration " protection, only action is once.
And in factory's practical application; Because the realization of " prepared auto restart " function must be taken a sample to busbar voltage through " voltage circuit " (comprising secondary fuse, voltage relay etc.); Behind bus or inlet wire " dead electricity ", " prepared auto restart " all can start, and drops into stand-by power supply.
But, when the secondary fuse of " voltage circuit " or voltage relay break down, very easily cause " prepared auto restart " device error starting, influence the normal operation of electric power system.
The day for announcing is 2007.11.21, and notification number is the Chinese utility model patent of CN 200979999Y, discloses a kind of " backup auto-activating device "; It comprises three circuit breakers, motor-operating mechanism and automatic switchover appliance controller; Two circuit breakers are connected on respectively in the two-way power-supply system, and another circuit breaker is connected between two sections buses, and the two-way power-supply system connects two sections buses respectively; The automatic switchover appliance controller further comprises the operational mode switch; Be used to judge system situation, the control motor-operating mechanism breaks off the circuit breaker of the power-supply system that breaks down, then the circuit breaker of closed another power-supply system.
On control method, this technical scheme is installed voltage relay UX1, UX2 respectively in power supply 1# inlet wire, power supply 2# end of incoming cables in the sectionalized single busbar connection operational system; Get arbitrary phase voltage of two-way inlet wire; Simultaneously on two sections buses of system, voltage relay UM1 is set respectively, UM2 gets busbar voltage, (the two poles of the earth inspection does not have and presses, and promptly UX1, UM1 do not have pressure or UX2, UM2 does not have pressure) promptly is judged as this inlet wire fault when one section primary voltage and busbar voltage all lose; " prepared auto restart " device action then; Automatically this incoming power of tripping switch drops into Backup Power Switch simultaneously, recovers the power supply of dead electricity bus.
But the deficiency of this control mode is: the action of " prepared auto restart " still is subject to the accuracy in voltage sampling loop; Promptly burn or voltage relay when damaging misoperation when " voltage circuit " fuse; All possibly cause the misoperation of power supply backup auto-activating device, reduce the reliability of backup auto-activating device.
It is thus clear that; Prior art is to the electric substation of low-voltage power supply system list mother partition operation, and as long as most modes that primary voltage is a basis for estimation of singly getting that adopt are promptly the primary voltage relay electric-loss; Promptly judge this loop fault dead electricity, carry out the input/switching of stand-by power supply immediately.
The deficiency of this control mode is; Accuracy to voltage sampling relies on more to some extent; Become in the distribution running in reality; Also take place often to cause the misoperation of power supply prepared auto restart because of " control voltage " loop fuse opening or voltage relay fault, the accident that causes mistake to jump into wiretap takes place; So industrial enterprise is the generation of avoiding the backup auto-activating device malfunction; Often forced that " prepared auto restart " function of electric substation is out of service; But when " decompression " fault really takes place in certain road inlet wire; " prepared auto restart " device but can't in time start, and brings unnecessary harm and influence for normal power supply and serialization commercial production.
Summary of the invention
Technical problem to be solved by this invention provides a kind of improved electric substation sectionalized single busbar connection operation power supply prepared auto restart changing method; It directly adopts the on/off of inlet wire contactor, judge incoming power voltage normally whether, can divide/close through the segmentation contactor; Judge whether backup power source voltage is normal; Make that " prepared auto restart " function is more reliable, implementation is simpler and more direct effectively, has avoided primary voltage sampling circuit fault to cause the risk of " prepared auto restart " misoperation; Helping long-term, the reliability service of electric substation, is a kind of power supply prepared auto restart control method safe, simple and direct, easy to implement.
Technical scheme of the present invention is: a kind of improved electric substation sectionalized single busbar connection operation power supply prepared auto restart changing method is provided; Its electric substation's major loop wiring adopts first electric power incoming line through first inlet wire contactor to the first bus section, busbar section; The second source inlet wire is provided with the segmentation contactor through second inlet wire contactor to the second bus section, busbar section between first, second bus; When first or second source inlet wire when " dead electricity " fault takes place, described segmentation contactor auto-closing, the operational mode with first and second bus section, busbar sections divide corresponding realization to be electrically connected is characterized in that said improved prepared auto restart changing method may further comprise the steps:
A, get the line voltage of first, second electric power incoming line, respectively accordingly as the control power supply of described first, second inlet wire contactor coil;
B, described segmentation contactor control coil respectively with the corresponding connection of the a-c of first, second bus section, busbar section, obtain the first and second control power supplys respectively from the a-c of first and second bus section, busbar sections mutually;
C, with the normally closed auxiliary contact of the said first inlet wire contactor, the corresponding access between the segmentation contactor control coil and the second control power supply; With the normally closed auxiliary contact of the said second inlet wire contactor, the corresponding access between the segmentation contactor control coil and the first control power supply;
The control logic of D, employing " inspection of inlet wire dead electricity do not have press ", whether the branch through the auxiliary normally closed contact of first, second inlet wire contactor/close checks the voltage in this inlet wire loop, road normal;
E, when normally moving; The described first and second inlet wire contactors are in " closure " state; Described segmentation contactor is in " separating brake " state; Described first electric power incoming line is connected to first bus section, busbar section through the first inlet wire contactor, and described second source inlet wire is connected to second bus section, busbar section through the second inlet wire contactor;
The control logic of F, employing " inspection of segmentation contactor has pressure ", behind first electric power incoming line " dead electricity ", the normally-closed contact of the first inlet wire contactor is closed, connects the segmentation contactor coil and controls being electrically connected between the power supply with second;
This moment is if the second bus section, busbar section power supply is normal, voltage is stable; Then second of the segmentation contactor control power supply is normal; The adhesive of segmentation contactor coil, the segmentation contactor puts into operation, and the power supply of second bus section, busbar section is delivered to first bus section, busbar section through the segmentation contactor; Recover the power supply of one section bus, realize " prepared auto restart " function of power supply;
This moment, then the segmentation contactor can't be closed as if two sections busbar voltages " decompression ", and " prepared auto restart " function is failure to actuate, and realizes the control logic of " inspection has pressure ";
The control logic of G, employing " inspection of segmentation contactor has pressure ", behind second source inlet wire " dead electricity ", the normally-closed contact of the second inlet wire contactor is closed, connects the segmentation contactor coil and controls being electrically connected between the power supply with first; This moment is if the first bus section, busbar section power supply is normal, voltage is stable; Then first of the segmentation contactor control power supply is normal; The adhesive of segmentation contactor coil, the segmentation contactor puts into operation, and the power supply of first bus section, busbar section is delivered to second bus section, busbar section through the segmentation contactor; Recover the power supply of two sections buses, realize " prepared auto restart " function of power supply; If one section busbar voltage " decompression ", then the segmentation contactor can't be closed, and " prepared auto restart " function is failure to actuate, and realizes the control logic of " inspection has pressure ";
H, when first or the voltage of second source inlet wire recover normal after; The control supply voltage of the first or second inlet wire contactor is corresponding to recover normal; Through " combined floodgate " button in the first or second inlet wire contactor control loop; First or the second inlet wire contactor major loop contact terminal is closed, as to recover " dead electricity " power inleting terminal power supply; Simultaneously; The normally closed node of the first or second inlet wire contactor is opened immediately; Moment breaks off the segmentation contactor and controls being electrically connected between the power supply with second or first; The segmentation main noddle on contactor breaks off, and system of whole electric substation recovers the operational mode of original double loop inlet wire, sectional power supply automatically, realizes " automatic switchover of service restoration prepared auto restart " function;
I, with first or the line voltage of second source inlet wire insert the first or second inlet wire contactor coil and control power supply as it; The a-c phase line voltage of first, second bus section, busbar section is controlled power supplys as first and second of segmentation contactor respectively; Through with the control power supply of above-mentioned line voltage as the corresponding contact device; Participate in the throwing of " prepared auto restart "/cut control, cancellation tradition " prepared auto restart " must be carried out the monitoring step preface of " voltage sample " to each road electric power incoming line and each bus section, busbar section, avoids because of " voltage sample " loop fuse or voltage relay fault; The hidden danger that causes the prepared auto restart misoperation strengthens the reliability that the prepared auto restart protection is moved.
Further, when first or second source inlet wire " dead electricity " after, described segmentation contactor is closed; If segmentation contactor switching is in " busbar fault "; Then it protects loop tripping segmentation immediately contactor, and the segmentation main noddle on contactor breaks off, and guarantees described prepared auto restart " combined floodgate " once.
Concrete, when said first or the line voltage of second source inlet wire be lower than its load voltage value 60% the time, the first or second inlet wire contactor decompression discharges, and breaks off corresponding electric power incoming line loop.
Concrete, described section breaker detects through the on/off to the auxiliary normally closed contact of the said first and second inlet wire contactors, and normally whether line voltage that to judge this inlet wire loop, road.
The line voltage of its said first, second electric power incoming line is 380V.
Further, described segmentation contactor is then according to the ruuning situation of first, second inlet wire contactor, and the line voltage of selectively come into operation first bus section, busbar section or second bus section, busbar section is as the control power supply.
Concrete, after the described first inlet wire contactor dead electricity tripping, the segmentation contactor selects for use the line voltage of second bus section, busbar section as the control power supply.
After the described second inlet wire contactor dead electricity tripping, the segmentation contactor selects for use the line voltage of first bus section, busbar section as the control power supply.
Then the segmentation contactor select stand-by power supply all the time for use bus section, busbar section voltage as the control power supply, as long as corresponding backup power source voltage is normal, just " getting " adhesive of segmentation contactor, the power supply that recovers corresponding dead electricity bus section, busbar section.
Compare with prior art, advantage of the present invention is:
1. inlet wire contactor control power supply is caused this section inlet wire loop; Directly whether primary voltage is normally judged; Needn't install relay in addition additional judges voltage; Eliminated the hidden danger that primary voltage sampling circuit fuse failure or voltage relay fault cause the prepared auto restart misoperation, method is succinct more reliable;
2. after the action of inlet wire contactor decompression, selectively connect segmentation contactor control power supply through its normally closed node, thereby whether backup power source voltage is normally detected, reduce unnecessary control logic step, the prepared auto restart controlled function more effectively, reliably;
3. after incoming power recovers normally,, recover the normal power supply of inlet wire through the closed inlet wire contactor of " combined floodgate " button; The normally closed node of its inlet wire contactor is opened simultaneously; Break off the control power supply of segmentation contactor, the segmentation contactor breaks off immediately, and (promptly one section bus is supplied power by the 1# electric power incoming line to recover original supply power mode; Two sections buses are by the power supply of 2# electric power incoming line), the power supply prepared auto restart recovers former supply power mode more flexibly, conveniently;
4. segmentation is provided with protection switch, if the prepared auto restart action switches on fault, then the contact loop is broken off in tripping operation immediately, guarantees that prepared auto restart only closes a floodgate once;
5. reduce the voltage sample link, it is simpler and more direct, efficient, reliable to make that power supply prepared auto restart function realizes; The realization of power supply prepared auto restart function no longer is limited by the whether normal restriction of voltage relay, and method is easy to field conduct, is specially adapted to the improvement project to existing transformer station.
Description of drawings
Fig. 1 is traditional prepared auto restart control principle block diagram;
Fig. 2 is traditional prepared auto restart logic criterion block diagram;
Fig. 3 is the prepared auto restart control principle block diagram of technical scheme of the present invention;
Fig. 4 is the control circuit sketch map of the present technique scheme first inlet wire contactor;
Fig. 5 is the control circuit sketch map of the present technique scheme second inlet wire contactor;
Fig. 6 is the control circuit sketch map of present technique scheme segmentation contactor;
Fig. 7 is a present technique scheme logic criterion block diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Among Fig. 1; Electric substation to factory and enterprise low-voltage power supply system sectionalized single busbar connection operational mode; " prepared auto restart " controlling schemes that it is traditional; Be to install the voltage that first, second voltage sample relay UX1, UX2 obtain each road inlet wire respectively in the end of incoming cables of first, second power supply (represent with 1# power supply, 2# power supply among the figure, down with), (custom abbreviates one section bus, two sections buses as in the industry at first bus section, busbar section, second bus section, busbar section of system simultaneously; Down together), get the line voltage of two sections buses respectively through the 3rd, the 4th voltage relay UM1, UM2.
Mark code name PT is a voltage transformer among the figure, and CT is a current transformer, and DL is a circuit breaker, and HJD is a fuse, and UX is the primary voltage relay, and UM is the busbar voltage relay.
Because this figure adopts this area standard symbol and mask method, its concrete implication and interconnected relationship are no longer narrated at this, and those skilled in the art all can understand its implication and annexation like clockwork.
Its logic criterion is as shown in Figure 2; That is, (the two poles of the earth inspection do not have press, promptly UX1, UM1 do not have pressure) promptly is judged as this inlet wire fault when one section primary voltage and one section busbar voltage all lose; " prepared auto restart " device action then; Automatically the electric power incoming line switch 1DL in this inlet wire of tripping loop drops into stand-by power supply interconnection switch 3DL simultaneously, recovers the power supply to one section bus; (the two poles of the earth inspection does not have and presses when two sections primary voltages and two sections busbar voltages all lose; Be that UX2, UM2 do not have pressure) promptly be judged as this inlet wire fault; " prepared auto restart " device action then; Automatically the electric power incoming line switch 2DL in this inlet wire of tripping loop drops into stand-by power supply interconnection switch 3DL simultaneously, recovers the power supply to two sections buses.
Can know by above-mentioned control logic relation whether traditional backup auto-activating device at first must judge each bar line fault as foundation through the sampling of voltage relay, is about to primary voltage or busbar voltage and inserts voltage relay; After the judgement through voltage relay; See the switch motion instruction off, carry out the function of prepared auto restart, so the implementation of its " prepared auto restart " controlled function is loaded down with trivial details; And must depend on the intact of voltage control loop, otherwise cause the misoperation of " prepared auto restart " device easily.And " prepared auto restart " misoperation in a single day will bring unnecessary economic loss to enterprise.
Among Fig. 3; The present technique scheme is got the line voltage of first, second electric power incoming line; Respectively accordingly as the control power supply of described first, second inlet wire contactor coil 1JC, 2JC; Segmentation contactor control coil 3JC respectively with the corresponding connection of a-c of first, second bus section, busbar section (female among the figure, II matrix show, down with) with I, obtain the first and second control power supplys mutually respectively from the a-c of first and second bus section, busbar sections.
During normal the operation, the first and second inlet wire contactor 1JC and 2JC are in " closure " state, and described segmentation contactor 3JC is in " separating brake " state; First electric power incoming line (is represented with the #1 inlet wire among the figure; Be connected to first bus section, busbar section (showing with the I matrix among the figure, down together) through the first inlet wire contactor 1JC down together), the second source inlet wire (is represented with the #2 inlet wire among the figure; Be connected to second bus section, busbar section (showing with the II matrix among the figure, down together) through the second inlet wire contactor 2JC down together).
Adopt the present technique scheme, the control power supply of arbitrary electric power incoming line of transformer station (1# inlet wire or 2# inlet wire) inlet wire contactor (1JC or 2JC) is then directly got the line voltage of this inlet wire; Select for use contactor to satisfy when rated voltage 60% is above; The reliable adhesive of contactor, deciliter check inlet wire loop voltage that will realize directly passing through the inlet wire contactor so normally whether, i.e. the reliable adhesive of inlet wire contactor; The voltage that this inlet wire loop, road then is described is normal; And the inlet wire contactor separately, explains that then the voltage of this road inlet wire is lower than rated voltage below 60%, can't satisfy normal power supply.
So, through the inlet wire contactor deciliter both can judge primary voltage normally whether, realized the first step logic " the inlet wire dead electricity is then jumped into lane controller " of power supply " prepared auto restart " action.
" prepared auto restart " after the improvement no longer is confined to the restriction of voltage control loop (voltage fuse, voltage relay) fault, and function is more reliable, and implementation is simpler and more direct effectively, helps the operation reliably and with long-term of electric substation.
Fig. 4,5,6 has provided the control circuit sketch map of first, second inlet wire contactor and segmentation contactor.
RD is a fuse among the figure, and HA is " combined floodgate " button, and TA is " tripping operation " button; ZJ is an auxiliary relay, and a1 is a phase of first electric power incoming line, and c1 is the c phase of first electric power incoming line; Similarly, a2 is a phase of second source inlet wire, and c2 is the c phase of second source inlet wire; HD is the switching signal lamp, and LD is the tripping operation indicator light, and HK is a conversion controling switch.
Can know by figure; First or the line voltage of second source inlet wire insert the first or second inlet wire contactor coil and control power supply as it; The a-c phase line voltage of first, second bus section, busbar section is controlled power supplys as first and second of segmentation contactor respectively; Through with the control power supply of above-mentioned line voltage, participate in the throwing of " prepared auto restart "/cut control as the corresponding contact device.
The normally closed auxiliary contact 1C of the first inlet wire contactor, the corresponding access between the segmentation contactor control coil 3C and the second control power supply a2-c2; The normally closed auxiliary contact 2C of the second inlet wire contactor, the corresponding access between the segmentation contactor control coil 3C and the first control power supply a1-c1.
Because this figure adopts standard symbol and mask method electric or the power supply field; Its concrete implication, interconnected relationship and control action process are no longer narrated at this, and those skilled in the art all can understand its implication, annexation and logic control course of action like clockwork.
Fig. 7 has provided the logic criterion block diagram of present technique scheme.
During normal the operation, segmentation contactor 3JC is in " separating brake " state, and 1# inlet wire contactor 1JC and 2# inlet wire contactor 2JC are in " closure " state.
The control power supply of 1# inlet wire contactor is taken from the alternate 380V power supply of a-c of one section inlet wire, and the control power supply of 2# inlet wire contactor is taken from the alternate 380V power supply of a-c of two sections inlet wires.
When the voltage of two-way electric power incoming line just often, the control power supply of the first and second inlet wire contactors is stable, corresponding inlet wire contactor " adhesive " is reliable, one section bus, two sections bus apportions of electric power system normally move.
Literal among above-mentioned narration and the figure in the logical condition square frame is slightly different, be because among the figure for succinctly, the segment word content has adopted the code name statement or has been accustomed to the cause of appellation in the industry, down with.
Behind one section inlet wire of electric power system " dead electricity ", one section inlet wire a-c voltage between phases disappears 1# contactor 1JC power supply out of hand; The coil of contactor own is because dead electricity is pressed and release automatically; Cut off 1# inlet wire loop, realize " the inlet wire inspection does not have pressure " function, 1# contactor normally-closed contact " closure " simultaneously; Connect 3# contactor control power supply (from two sections alternate 380V power supplys of bus ac), for 3# contactor 3JC " adhesive " prepares.
After one section inlet wire dead electricity of electric power system; Because the closed connection of 1# contactor normally-closed contact 3# contactor is from the two sections alternate 380V control of bus a-c power supplys, then this moment is if power supply is normal, voltage is stable for two sections buses (abbreviating two mothers among the figure as, down together); 3# contactor 380V control power supply normal (realizing " inspection has pressure " function); Coil adhesive 3# contactor puts into operation, and two sections bus power supplys recover the power supply to one section bus through the 3# contactor, realize power supply " prepared auto restart " function.
Behind two sections inlet wires of electric power system " dead electricity ", two sections inlet wire a-c voltages between phases disappear 2# contactor 2JC power supply out of hand; The coil of contactor own is because dead electricity is pressed and release automatically; Cut off 2# inlet wire loop, realize " the inlet wire inspection does not have pressure " function, 2# contactor normally-closed contact " closure " simultaneously; Connect 3# contactor control power supply (from one section alternate 380V power supply of bus ac), for 3# contactor 3JC " adhesive " prepares.
After two sections inlet wire dead electricity of electric power system, because the closed 3# contactor of connecting of 2# contactor 2JC normally-closed contact is from the one section alternate 380V control of bus ac power supply, then at this moment if one section bus (abbreviates a mother as among the figure; Down together) power supply is normal, voltage is stable; 3# contactor 380V control power supply normal (realizing " inspection has pressure " function), the coil adhesive, 3# contactor 3JC puts into operation; One section bus power supply recovers the power supply to two sections buses through the 3# contactor, realizes power supply " prepared auto restart " function.
In power supply industry; The road inlet wire that " dead electricity " will take place custom (for example; First via inlet wire) pairing bus section, busbar section (i.e. first bus section, busbar section) abbreviates " dead electricity bus section, busbar section " as; Another road inlet wire (for example, the second road inlet wire) that will be corresponding with it abbreviates stand-by power supply or stand-by power supply loop as.
Visible from above-mentioned narrating content, the segmentation contactor selects for use the bus section, busbar section voltage of stand-by power supply as the control power supply all the time, as long as corresponding backup power source voltage is normal, and just " getting " adhesive of segmentation contactor, the power supply that recovers corresponding " dead electricity " bus section, busbar section.
After that road inlet wire (1# inlet wire or 2# inlet wire) power up that " dead electricity " takes place is normal; Its corresponding inlet wire contactor control power up is normal; Can recover the power supply of dead electricity bus through " combined floodgate " button with 1# contactor (or 2# contactor) closure, the normally closed node of its 1# contactor (or 2# contactor) is opened immediately simultaneously; Moment is broken off the control power supply of segmentation contactor; Segmentation contactor " dead electricity " breaks off, and recovers former supply power mode (promptly one section bus is from the power supply of 1# power supply, and two sections buses are by the power supply of 2# inlet wire) automatically.
Electric power system segmentation loop is provided with 3# contactor and sectionalised protection switch; No matter be after 3# contactor that one section bus " dead electricity " or two sections buses " dead electricity " are caused normally comes into operation; If the stand-by power supply switching is in busbar fault, the contact loop is cut off in then sectionalised protection switch moving tripping operation of wink immediately; Make stand-by power supply loop normal power supply, realize the function that the power supply prepared auto restart " only closes a floodgate once ".
Because above-mentioned logic control action relationships all can realize through the interlocking condition of substation secondary control loop; No matter be the logic control chart that adopts resolution element or adopt the PLC industrial computer; All can easily realize, so it realizes that the concrete annexation between circuit and each coil, the contact no longer narrates at this.
To sum up, the prepared auto restart action logic of present technique scheme is:
(1) inspection of inlet wire dead electricity does not have pressure:
A, inlet wire 1 or inlet wire 2 dead electricity, 1# contactor or 2# contactor are judged dead electricity, do not have to press to discharge tripping inlet wire loop;
After b, 1# contactor or 2# contactor were judged the dead electricity tripping, the closed logical 3# contactor control power supply of simultaneously normally closed node was prepared for judging that stand-by power supply has to press;
(2) segmentation 3# contactor realizes that inspection has pressure:
A ', inlet wire 1 or inlet wire 2 dead electricity, 1# contactor or 2# contactor are judged the dead electricity tripping, simultaneously the closed 3# contactor control power supply (from two sections buses or from one section bus) of connecting of normally-closed contact; If two sections busbar voltages or one section busbar voltage are normal; Then 3# contactor closure drops into stand-by power supply immediately, if two sections busbar voltages or one section bus loss of pressure, then the 3# contactor can't be closed; Prepared auto restart is failure to actuate, and realizes that inspection has compression functions;
After b ', the 3# contactor closure, if the stand-by power supply switching is in fault, then sectionalised protection switch tripping stand-by power supply loop immediately guarantees that prepared auto restart only closes a floodgate once.
Model/the parameter of related capital equipment in the present technique scheme:
1 ﹑ control contactor unit type: B250~380V (JC satisfies reliable adhesive when system voltage 65%);
When system line voltage during greater than 250V, the reliable adhesive of contactor, when system line voltage during less than 250V, contactor discharges, and stand-by power supply starts prepared auto restart during greater than 250V (the ac voltage between phases is normal, not phase shortage).
2 ﹑ protection switch unit types: SACE S6PR211, In=320A (the moving tripping operation of 10 times of short circuit current winks is set).
The said equipment is the commercially available prod, all the other no specific (special) requirements.
The practical implementation step of technical scheme of the present invention is following:
1) installation instructions:
This programme only can be accomplished construction in power supply prepared auto restart cabinet, the strict electric industry construction safety rules of carrying out require cabinet reliably to have a power failure, to guarantee construction safety during construction.
(1) equipment such as contactor, circuit breaker, change over switch, divide-shut brake button, binding post at first is installed and fixes position and marked in the prepared auto restart control cubicle;
(2) with the 380V cable near primary equipment (contactor, circuit breaker) and fix, carry out shutoff in the cabinet;
(3) according to the principle drawing corresponding contacts such as relay, contactor are connected in series into control loop successively, construct in strict accordance with construction drawing, require the lead wire terminal reliably to be fastenedly connected, wiring must be drawn from terminal board and connect standard construction;
2) function check explanation:
After accomplishing according to construction drawing, controlled function is checked, 1# inlet wire contactor, 2# inlet wire contactor are in the " RUN " state during check, and the segmentation contactor is in " stand-by heat " state, and concrete checking procedure is following:
(1) the control power supply air switch (being designated hereinafter simply as little sky runs) (from 1# inlet wire line voltage) that draws back 1# inlet wire contactor imitates this distance electric power incoming line " dead electricity "; 1# contactor 1JC tripping; Segmentation contactor 3JC closes a floodgate; Stand-by power supply puts into operation, and the action of checking 1# inlet wire " dead electricity " prepared auto restart is normal;
(2) the little sky of 1# inlet wire contactor 1JC control power supply that closes is opened, " combined floodgates " button of the 1# contactor 1JC that manually closes, and the 1# contactor closes a floodgate and puts into operation, while segmentation contactor 3JC tripping, stand-by power supply is out of service;
(3) drawing back the little sky of 2# inlet wire contactor control power supply runs (from 2# inlet wire line voltage) and imitates this distance electric power incoming line " dead electricity "; 2# contactor 2JC tripping; Segmentation contactor 3JC closes a floodgate, and stand-by power supply puts into operation, and the action of checking 1# inlet wire " dead electricity " prepared auto restart is normal;
(4) the little sky of 2# inlet wire contactor 2JC control power supply that closes is opened, " combined floodgates " button of the 2# contactor 2JC that manually closes, and the 2# contactor closes a floodgate and puts into operation, while segmentation contactor 3JC tripping, stand-by power supply is out of service;
(5) after above verification is accomplished,, after the inspection affirmation is errorless, power supply prepared auto restart function is put into operation according to the lead wire of each calibration equipment of construction drawing recovery.
Whole functional verification/test procedure finishes.
In sum, the present invention inserts contactor control power supply, the control method of participating in the control of prepared auto restart switching through the line voltage with inlet wire and bus; Reduced the conventional power source prepared auto restart and must carry out voltage sample monitoring step preface inlet wire and bus; Avoid primary voltage sampling circuit fuse failure or voltage relay fault, caused the hidden danger of " prepared auto restart " misoperation, reduced unnecessary logic determines step; Greatly strengthened the reliability of " prepared auto restart " protection action; It is more flexible that the power supply prepared auto restart recovers former supply power mode, can guarantee that prepared auto restart only closes a floodgate once, and easy to implement in real work; Being specially adapted to the improvement project to existing transformer station, is a kind of economy, Electrical Control Technology safe, easy to implement.
The present invention can be widely used in the input/releasing control field of the urgent or stand-by power supply of electric substation under the factory and enterprise low-voltage power supply system sectionalized single busbar connection operational mode.

Claims (7)

1. an improved electric substation sectionalized single busbar connection moves power supply prepared auto restart changing method; Its electric substation's major loop wiring adopts first electric power incoming line through first inlet wire contactor to the first bus section, busbar section; The second source inlet wire is provided with the segmentation contactor through second inlet wire contactor to the second bus section, busbar section between first, second bus; When first or second source inlet wire when " dead electricity " fault takes place, described segmentation contactor auto-closing, the operational mode with first and second bus section, busbar sections divide corresponding realization to be electrically connected is characterized in that said improved prepared auto restart changing method may further comprise the steps:
A, get the line voltage of first, second electric power incoming line, respectively accordingly as the control power supply of described first, second inlet wire contactor coil;
B, described segmentation contactor control coil respectively with the corresponding connection of the a-c of first, second bus section, busbar section, obtain the first and second control power supplys respectively from the a-c of first and second bus section, busbar sections mutually;
C, with the normally closed auxiliary contact of the said first inlet wire contactor, the corresponding access between the segmentation contactor control coil and the second control power supply; With the normally closed auxiliary contact of the said second inlet wire contactor, the corresponding access between the segmentation contactor control coil and the first control power supply;
The control logic of D, employing " inspection of inlet wire dead electricity do not have press ", whether the branch through the auxiliary normally closed contact of first, second inlet wire contactor/close checks the voltage in this inlet wire loop, road normal;
E, when normally moving; The described first and second inlet wire contactors are in " closure " state; Described segmentation contactor is in " separating brake " state; Described first electric power incoming line is connected to first bus section, busbar section through the first inlet wire contactor, and described second source inlet wire is connected to second bus section, busbar section through the second inlet wire contactor;
The control logic of F, employing " inspection of segmentation contactor has pressure ", behind first electric power incoming line " dead electricity ", the normally-closed contact of the first inlet wire contactor is closed, connects the segmentation contactor coil and controls being electrically connected between the power supply with second;
This moment is if the second bus section, busbar section power supply is normal, voltage is stable; Then second of the segmentation contactor control power supply is normal; The adhesive of segmentation contactor coil, the segmentation contactor puts into operation, and the power supply of second bus section, busbar section is delivered to first bus section, busbar section through the segmentation contactor; Recover the power supply of one section bus, realize " prepared auto restart " function of power supply;
This moment, then the segmentation contactor can't be closed as if two sections busbar voltages " decompression ", and " prepared auto restart " function is failure to actuate, and realizes the control logic of " inspection has pressure ";
The control logic of G, employing " inspection of segmentation contactor has pressure ", behind second source inlet wire " dead electricity ", the normally-closed contact of the second inlet wire contactor is closed, connects the segmentation contactor coil and controls being electrically connected between the power supply with first; This moment is if the first bus section, busbar section power supply is normal, voltage is stable; Then first of the segmentation contactor control power supply is normal; The adhesive of segmentation contactor coil, the segmentation contactor puts into operation, and the power supply of first bus section, busbar section is delivered to second bus section, busbar section through the segmentation contactor; Recover the power supply of two sections buses, realize " prepared auto restart " function of power supply; If one section busbar voltage " decompression ", then the segmentation contactor can't be closed, and " prepared auto restart " function is failure to actuate, and realizes the control logic of " inspection has pressure ";
H, when first or the voltage of second source inlet wire recover normal after; The control supply voltage of the first or second inlet wire contactor is corresponding to recover normal; Through " combined floodgate " button in the first or second inlet wire contactor control loop; First or the second inlet wire contactor major loop contact terminal is closed, as to recover " dead electricity " power inleting terminal power supply; Simultaneously; The normally closed node of the first or second inlet wire contactor is opened immediately; Moment breaks off the segmentation contactor and controls being electrically connected between the power supply with second or first; The segmentation main noddle on contactor breaks off, and system of whole electric substation recovers the operational mode of original double loop inlet wire, sectional power supply automatically, realizes " automatic switchover of service restoration prepared auto restart " function;
I, with first or the line voltage of second source inlet wire insert the first or second inlet wire contactor coil and control power supply as it; The a-c phase line voltage of first, second bus section, busbar section is controlled power supplys as first and second of segmentation contactor respectively; Through with the control power supply of above-mentioned line voltage as the corresponding contact device; Participate in the throwing of " prepared auto restart "/cut control, cancellation tradition " prepared auto restart " must be carried out the monitoring step preface of " voltage sample " to each road electric power incoming line and each bus section, busbar section, avoids because of " voltage sample " loop fuse or voltage relay fault; The hidden danger that causes the prepared auto restart misoperation strengthens the reliability that the prepared auto restart protection is moved.
2. according to the described improved electric substation of claim 1 sectionalized single busbar connection operation power supply prepared auto restart changing method; It is characterized in that when first or second source inlet wire " dead electricity " after; Described segmentation contactor is closed, and in " busbar fault ", then it protects loop tripping segmentation immediately contactor as if segmentation contactor switching; The segmentation main noddle on contactor breaks off, and guarantees described prepared auto restart " combined floodgate " once.
3. according to the described improved electric substation of claim 1 sectionalized single busbar connection operation power supply prepared auto restart changing method; It is characterized in that when said first or the line voltage of second source inlet wire be lower than its load voltage value 60% the time; First or the second inlet wire contactor decompression discharges, and breaks off corresponding electric power incoming line loop.
4. according to the described improved electric substation of claim 1 sectionalized single busbar connection operation power supply prepared auto restart changing method; It is characterized in that described section breaker detects through the on/off to the auxiliary normally closed contact of the said first and second inlet wire contactors, normally whether line voltage that to judge this inlet wire loop, road.
5. according to the described improved electric substation of claim 4 sectionalized single busbar connection operation power supply prepared auto restart changing method, the line voltage that it is characterized in that said first, second electric power incoming line is 380V.
6. according to the described improved electric substation of claim 1 sectionalized single busbar connection operation power supply prepared auto restart changing method; It is characterized in that described segmentation contactor then according to the ruuning situation of first, second inlet wire contactor, the line voltage of selectively come into operation first bus section, busbar section or second bus section, busbar section is as the control power supply.
7. according to the described improved electric substation of claim 6 sectionalized single busbar connection operation power supply prepared auto restart changing method, it is characterized in that after the described first inlet wire contactor dead electricity tripping segmentation contactor selects for use the line voltage of second bus section, busbar section as the control power supply; After the described second inlet wire contactor dead electricity tripping, the segmentation contactor selects for use the line voltage of first bus section, busbar section as the control power supply; Then the segmentation contactor select stand-by power supply all the time for use bus section, busbar section voltage as the control power supply, as long as backup power source voltage is normal, just " getting " adhesive of segmentation contactor, the power supply that recovers corresponding dead electricity bus section, busbar section.
CN2012102208382A 2012-06-29 2012-06-29 Improved spare power source automatic switch method for single bus sectionalized operation of power substation Pending CN102790426A (en)

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CN103280881A (en) * 2013-04-25 2013-09-04 国家电网公司 Decoupling control method for controlling automatic switching of backup power supply by expansion inner bridge connection wire microcomputer
CN103701199A (en) * 2013-12-25 2014-04-02 施耐德万高(天津)电气设备有限公司 Parallel changeover control system with closed-loop switch-off protection
CN103887873A (en) * 2014-03-12 2014-06-25 国家电网公司 Power supply standby device for transformer substation achieved based on PLC
CN103997117A (en) * 2014-06-10 2014-08-20 国家电网公司 Intelligent intertripping load spare power automatic switching device
CN104079061A (en) * 2014-07-11 2014-10-01 云南电网公司带电作业分公司 Working method for transferring 10kV loads in electrified mode by adopting automatic spare power switching technology
WO2015074429A1 (en) * 2013-11-19 2015-05-28 国家电网公司 Distributed spare automatic switching apparatus connection method and spare automatic switching action method thereof
CN105811563A (en) * 2016-03-22 2016-07-27 国网福建省电力有限公司 AC charging automatic switching circuit for DC system
CN109659938A (en) * 2019-01-24 2019-04-19 中山市明阳电器有限公司 A kind of voltage commutation circuit of voltage transformer low-pressure side
CN110445251A (en) * 2019-09-03 2019-11-12 威立雅(哈尔滨)热电有限公司 Low-voltage Backup Power based on programmable controller automatically engages system
CN112086868A (en) * 2020-07-23 2020-12-15 广西电网有限责任公司电力科学研究院 Outdoor switch box automated complete equipment control circuit
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CN103280881A (en) * 2013-04-25 2013-09-04 国家电网公司 Decoupling control method for controlling automatic switching of backup power supply by expansion inner bridge connection wire microcomputer
CN103280880A (en) * 2013-04-25 2013-09-04 国家电网公司 Decoupling control method for controlling backup power supply automatic switching by expansion inner bridge microcomputer
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WO2015074429A1 (en) * 2013-11-19 2015-05-28 国家电网公司 Distributed spare automatic switching apparatus connection method and spare automatic switching action method thereof
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CN105811563A (en) * 2016-03-22 2016-07-27 国网福建省电力有限公司 AC charging automatic switching circuit for DC system
CN109659938A (en) * 2019-01-24 2019-04-19 中山市明阳电器有限公司 A kind of voltage commutation circuit of voltage transformer low-pressure side
CN109659938B (en) * 2019-01-24 2023-10-10 广东明阳电气股份有限公司 Voltage switching circuit of low-voltage side of voltage transformer
CN110445251A (en) * 2019-09-03 2019-11-12 威立雅(哈尔滨)热电有限公司 Low-voltage Backup Power based on programmable controller automatically engages system
CN112086868A (en) * 2020-07-23 2020-12-15 广西电网有限责任公司电力科学研究院 Outdoor switch box automated complete equipment control circuit
CN114336947A (en) * 2022-01-04 2022-04-12 中国电建集团成都勘测设计研究院有限公司 Automatic standby power supply switching system and method

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