CN201374585Y - Undisturbed stability control device - Google Patents
Undisturbed stability control device Download PDFInfo
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- CN201374585Y CN201374585Y CN200920038070U CN200920038070U CN201374585Y CN 201374585 Y CN201374585 Y CN 201374585Y CN 200920038070 U CN200920038070 U CN 200920038070U CN 200920038070 U CN200920038070 U CN 200920038070U CN 201374585 Y CN201374585 Y CN 201374585Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model provides an undisturbed stability control device (I) which switches load onto standby lines at the fasted speed according to the status of the system when outrage of a power supply line occurs to avoid operational interruption or impact damage during power switching. The control device comprises a high-pressure device and a control device, wherein the high-pressure device comprises a power supply system with duplicate feeders; a main feeder supplies power for a bus I section; a standby feeder supplies power for a bus II section; the power supply system is provided with a current transformer, a voltage transformer, a breaker and an isolating switch; the control device comprises a main CPU controller, an auxiliary CPU controller, a power module and a management module; the current transformer and the voltage transformer are respectively connected with signal input ends of the main CPU controller; the breaker and the isolating switch are connected with control ends of the main CPU controller; the main CPU controller and the auxiliary CPU controller communicate with each other; and the management module communicates with a principal computer.
Description
Technical field:
The utility model provides no disturbance stabilization control device, is applicable to the 6kV and the above electric power system of continuous industry production process: fields such as the station service electrical system of petrochemical industry, coal, metallurgy, cogeneration power plant etc. or superstation and environment friendly system.The task of adopting this no disturbance stabilization control device is under the situation of supply line's outage, state according to system switches to load on the extension wire with the fastest speed, avoid when power supply switches, causing working voltage to interrupt or the equipment impact failure, simplify handover operation and also reduce misoperation, to guarantee the power consumption equipment reforwarding row that constantly is electrically connected.
Background technology:
A large amount of relaying protections, automatics etc. are installed in the electrical network, the supply network complexity, because electrical network is huge, be subjected to natural environment influence bigger at present, equipment is many, the probability of fault is higher, be prone to power supply short time disruption, China's electric power system preferentially guarantees the stable of electrical network simultaneously, so electric pressure is low more, the probability that power supply short time interruption (rolling) occurs is high more, and is also just big more to the influence of electricity consumption enterprise; Current supply circuit to electrical network is few more, and is also just big more to the influence of electricity consumption enterprise.
Because press in the chemical industry iron and steel enterprise and be generally isolated neutral system, because system is big, system capacitive current is big, though the installation arc suppression coil, often single-phase earthing takes place after, develop rapidly and be heterogeneous short circuit, busbar voltage will fluctuate rapidly; Because the needs of production technology often are equipped with jumbo rectifier transformer, a large amount of harmonic waves is arranged in the system simultaneously, protective relaying device, automatic control equipment are caused interference, equipment failure rate increases, thereby causes the electric power system unusual fluctuations; The hot often coupling of 400V protection, fuse protection, fault clearing time long (more than the general 200mS); System has when the self-starting motor exists in groups in a large number, and starting current big especially (may cause the protection misoperation sometimes) often exists that the busbar voltage fluctuation is big, the time is long; For guaranteeing power supply reliability, medium voltage network is a paired running for part large enterprise, and any equipment fault all can cause power-supply fluctuation in the system, and the probability that equipment has more existing voltage fluctuation more is high more.
More than the system voltage that causes of multiple reason when occurring than great fluctuation process, the as easy as rolling off a log bus section, busbar section top unit exception that causes is stopped, to such an extent as to it is unusual to cause technological process to occur, even flow process stops, cause produce disorderly.
For the motor in the system; when voltage drops to 70% when following; it is exerted oneself and will drop to below 50%; normally carrying out of technological process will be influenced; many equipment all are equipped with the under-voltage protection of 0.5S; when system occurs when unusual; even system's prepared auto restart precision maneuver; even handover success just; 0.5S under-voltage protection also moved; when simultaneity factor had in a large number in groups the self-starting motor, self-starting current big especially (may cause the protection misoperation sometimes) often existed that the busbar voltage fluctuation is big, the time is long.As: easily cause synchronous machine step-out, loss of excitation, low-voltage action and out of service, this moment, stand-by power supply can only be as emergency power supply, and interruption will appear in the technological process of production, have the very big hidden danger of production safety.
For medium and small chemical enterprise owing to there is not a large amount of high-voltage motors, when voltage fluctuation occurring in the system, the residual voltage decay of bus is fast especially, be that system is poor to the defensive ability/resistance ability of voltage fluctuation, simultaneously owing to most of A.C. contactor that adopts in the 400V switch cubicle, the characteristic of A.C. contactor is: return voltage 30%～70%, A.C. contactor just disconnects in 60-80mS, the voltage fluctuation that a variety of causes causes, very easily cause A.C. contactor improper separately, interrupting will appear in the technological process of production.
For the synchronous motor in the system, because the field loss protection action, very easily appears often from same power supply in field power supply when fluctuation takes place power supply; During mains fluctuations, very easily cause the synchronous machine step-out, cause synchronous machine out of service; When fluctuation long period occur when power supply in addition, under-voltage protection will be moved, and cause synchronous machine out of service.Important motor such as synchronous machine is out of service, will cause the very big hidden danger of production safety, even causes serious production safety accident.
Summary of the invention:
The utility model is at the prior art situation, a kind of no disturbance stabilization control device is provided, this device is under the situation of supply line's outage, state according to system switches to load on the extension wire with the fastest speed, avoid when power supply switches, causing outage or equipment impact failure, to guarantee the reforwarding row that constantly is electrically connected of loading.
The purpose of this utility model realizes by following measure:
A kind of no disturbance stabilization control device (I), it comprises high-tension apparatus and control appliance, it is characterized in that:
Described high-tension apparatus comprises the electric power system of double-fed line configuration, main feeder is powered to bus I section, standby feeder line is powered to bus II section, the current transformer that the double-fed line is respectively equipped with, voltage transformer and circuit breaker, and bus section, busbar section I section and bus II section are respectively equipped with voltage transformer and isolating switch; Connect by bus between bus I section and the bus II section;
Described control appliance comprises the host CPU controller, from cpu controller, power module, management module;
The voltage transformer of the current transformer of above-mentioned double-fed line and mutual induction of voltage, bus section, busbar section connects the signal input part of host CPU controller respectively, circuit breaker and isolating switch connect the control end of host CPU, communication mutually between the master and slave CPU is carried out communication between management module and the host computer.
Described management module comprises display module, print module and communication module.
Comprise display, printer, gps system, DCS system and other smart machine.
The utility model has following advantage compared to existing technology:
1, the utility model is under normal circumstances realized the manual switching between feeder line one, bus, the feeder line two.
2, under failure condition, judge, realize that the quick or residual voltage between main feeder, the standby feeder line is switched according to fault.
3, support multiple communication modes and hardware GPS to the time function.
Description of drawings
Fig. 1 control principle block diagram of the present utility model.
Fig. 2 is power supply primary system sketch.
Fig. 3 is control principle figure of the present utility model.
Fig. 4 is the logic diagram that artificial starting is switched simultaneously.
Fig. 5 is the improper starting of accident switch logic figure simultaneously.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, no disturbance stabilization control device adopts two CPU, finishes major functions such as measurement, logic and switching respectively, and finishes miscellaneous functions such as demonstration, communication, printing, carries out exchanges data between master and slave CPU.The master and slave CPU division of labor is coordinated, and has both guaranteed reliable in action and rapidity, has guaranteed configuration flexibility again.Adopted jumbo storage chip and programmable logic chip simultaneously, AC and DC separates, and switching value input and output part all adopts photoelectric isolation technology, has improved the global reliability and the fail safe of device.
Control device of the present utility model can provide two-way communication simultaneously: one road RS485 fieldbus, can realize and the electrical monitoring and management system connected network communication that perhaps be used to insert the DCS system, the acquiescence stipulations are MODBUS; One the tunnel is the RS232 interface, can download data to show in the computer or print electric current, voltage record ripple curve, and perform an analysis.Also can provide two-way RS485 fieldbus simultaneously, realize the letter with the two Netcoms of electrical monitoring and management system, perhaps be used to insert the DCS system, the acquiescence stipulations are MODBUS.
Management module of the present utility model comprises display module, print module, communication module etc., with demonstration, printing, the communication that realizes various analog quantitys, on off state and operation information, logout, accident record.
This device not only can by communication carry out to the time, and the astronomical clock hardware synchronization of GPS interface is arranged, with GPS carry out accurately to the time, error≤1ms.
Power module output+5V, ± 15V and+the 24V power supply, supplying apparatus is inner to be used.Power supply is that AC/DC is dual-purpose.
Master and slave cpu controller is mainly finished analog quantity and switching value measurement, calculates, is judged that result is exported through light-coupled isolation in the utility model.
Various switching value signals (idle contact) are isolated through relay and photoelectricity two-stage and are converted to small-signal and use for host CPU.
To be converted to small-signal and use through high-precision current output type voltage, current transformer isolation, filtering from voltage, the current signal that on-the-spot PT, CT come for host CPU.Various signals are exported in relay idle contact mode, can connect alarm window, DCS system or other smart machine.
The outlet breaker tripping and closing instruction that the host CPU controller sends is merged after photoelectricity isolation and auxiliary relay isolation amplification by logical groups is exported by the dry-reed relay idle contact.
By an electric power system shown in Figure 2, during the configuration mode of double-fed line: one of double-fed line is to bussed supply, circuit breaker 1DL, 3DL in the feeder line one, current transformer, voltage transformer 1PT.Bus I section voltage transformer 3PT, isolating switch 1HJD.Circuit breaker 2DL, 4DL in the feeder line two, current transformer, voltage transformer 2PT, bus II section voltage transformer 4PT, isolating switch 2HJD.Bus 5DL between bus I section and the line line II section.The host CPU controller is gathered double-fed line voltage signal and current signal, the voltage signal of bus I section, bus II section, and gather the state of each switch, according to amplitude, difference on the frequency, the phase angle difference of tested voltage, judge the circuit working order, control the opening and closing movement of each switch.
The utility model adopts the double-fed line to add the configuration mode of female connection, is the reason in view of redundancy, and electric load is dispensed in two sections buses.Be in gate-dividing state under the bus normal condition, two feeder line circuit breakers all are in "on" position.In case one feeder line breaks down, switching is to carry out between the circuit breaker of fault feeder and bus 5DL: faulty line breaker open operation, female associating lock.After the handover success, two buses are powered by a feeder line.In case after the fault on the feeder line of tripping is just got rid of, can return to initial power supply state by the no disturbance stabilization control device of manual type starting.This no disturbance stabilization control device therefore can be from the no disturbance stabilization control device of arbitrary feeder line starting, no matter which bar circuit is main feeder or standby feeder line by complete symmetrical manner design.
When the equal operate as normal of double-fed line, bus I section and bus II section voltage all just often, the configuration mode of each circuit breaker is: 1DL closes, 3DL closes, 5DL branch, 4DL close, 2DL closes.
When feeder line one breaks down, feeder line two voltages just often, the configuration mode that switches each circuit breaker of back is: circuit breaker 2DL closes, 4DL closes, 5DL closes, the 3DL branch, 1DL divides or close
When feeder line two breaks down, feeder line one voltage just often, the configuration mode that switches each circuit breaker of back is: circuit breaker 1DL closes, 3DL closes, 5DL closes, the 4DL branch, 2DL divides or close.
After one of control device of the present utility model and important characteristic are starting, switch with the shortest time, and can not bring any danger in switching the user.
This device compares the voltage of busbar voltage and standby feeder line all the time.Amplitude, difference on the frequency, phase angle difference to tested voltage have following synchronous criterion:
This phase angle difference refers to the phase angle difference between busbar voltage and the standby feeder voltage.The angular difference dividing value that constitutes synchronous criterion can be adjusted respectively according to leading or hysteresis busbar voltage.Dispatching typical dividing value is that difference on the frequency is less than ± 30 °.
The difference on the frequency of busbar voltage and standby feeder voltage also should be decided.Difference on the frequency has reacted the running after power consumption equipment (as middle piezoelectricity machine) and the dynamic load outage thereof and has indicated whether to allow to carry out.1Hz during common dividing value.
The voltage of standby feeder line is another important criterion of switching.Have only when feeder voltage exists and to carry out switching.Usually Ubymim is adjusted and is 80% of normal voltage UNORMAL.
Busbar voltage also plays an important role when determining switching mode: if bus voltage value is lower than setting voltage value Umx (Umx be decided to be usually normal voltage UNORMAL 70%), then do not allow to switch.
According to above-mentioned criterion, the mode that this device switches has following several: switching fast, homophase switch, residual voltage is switched or long delay switches.
1, switches fast: within the definite value scope, just can switch fast as the phase angle difference between main feeder and standby feeder line, difference on the frequency.Fast switching time should be less than 0.2S, thereby generally adopts high-speed switch to switch.Switch fast and define by the phase angle usually, as 55 °, if the intrinsic closing time of switch is 100ms, the angle the when order of then closing a floodgate is sent need shift to an earlier date 35 ° approximately, promptly can realize 20 ° of backup power source voltage and bus residual voltage vector angles with interior quick switching, be safe for equipment simultaneously.
2, homophase switches: promptly when phase angle difference is zero, realize switching, device is according to the Changing Pattern of real-time frequency, phase angle, amplitude, calculate the time when bus residual voltage and the backup power source voltage vector phase coincidence first time, closing circuit is during total time around when this, and sending closes a floodgate orders.Realize accurately the i.e. homophase first of zero crossing, and not influenced by load variations, very favourable to the self-starting of equipment.Homophase switches the reserve function of switching as fast.
3, residual voltage is switched: refer to decay to the switching that realizes after the 20%-40% rated voltage when residual voltage.Residual voltage is switched as the reserve function of switching fast and homophase switches.The starting and the condition of original feeder line separating brake with the homophase switching mode is identical first, be standby feeder line the combined floodgate condition and the homophase switching mode is different first.Have only when busbar voltage decays to certain permissible value, standby feeder line just can close.Need not criterion phase angle or difference on the frequency during combined floodgate, this is nonsynchronous switching mode.
4, long delay switches
If before the time of setting finishes, can't carry out above-mentioned any quick switching mode, can carry out time-delay and switch.For this reason, time control switching mode is only as the safe spare mode.The normal condition stabilization control device is this switching mode not to take place under the parameter of setting.Usually have only when in the short time fault taking place simultaneously repeatedly and just this switching mode may take place.
Control procedure of the present utility model is divided into following several situation:
One, the normal switching
When normal switching refers to system's operate as normal, manual switching main feeder and standby feeder switch.The normal switching is two-way, can be by the tangential standby feeder line of main feeder, and also can be by the tangential main feeder of standby feeder line.This function all can be carried out on control desk, DCS system or device panel by artificial starting.Normal switching also can be described as normally switches simultaneously.
Normally switch simultaneously, logic diagram as shown in Figure 4.
Normally switching simultaneously refers to the artificial switching simultaneously of starting, elder generation's jumping main feeder (standby feeder line) switch, and after satisfying the switching criterion, standby feeder line (main feeder) switch closes.Normally switching simultaneously has: fast, homophase, residual voltage switch criterion for three kinds, no disturbance stabilization control device switches fast and changes homophase or residual voltage switching when unsuccessful automatically over to.If the not tripping of main feeder (standby feeder line) switch, device is sent out handoff failure and device block signal simultaneously with decoupling; If starting back standby feeder line (main feeder) switch does not close, device is sent out handoff failure and device block signal simultaneously with locking.
Two, accident is switched
Accident is switched and to be referred to main feeder (standby feeder line) upper level main protection contact starting (refer to transformer or send out change group differential protection etc.), and it is two-way that accident is switched, can be by the tangential standby feeder line of main feeder, and also can be by the tangential main feeder of standby feeder line.
1, accident is switched simultaneously, i.e. the improper starting of accident is switched simultaneously, and logic diagram as shown in Figure 5.
By main feeder (standby feeder line) upper level main protection starting, jump main feeder (standby feeder line) switch earlier, when satisfying the switching criterion, standby feeder line (main feeder) switch closes.Switching simultaneously has: fast, homophase, residual voltage, long delay switch criterion for four kinds, no disturbance stabilization control device switch fast change homophase automatically over to when unsuccessful, residual voltage is switched or the long delay switching.If starting back standby feeder line (main feeder) switch does not close, device is sent out handoff failure and device block signal simultaneously with locking.If the not tripping of starting back main feeder (standby feeder line) switch, device is sent out handoff failure and device block signal simultaneously with decoupling.
Three, improper operating mode is switched
Improper operating mode is switched by device and is detected starting voluntarily after the improper situation, and improper switching is two-way, can be by the tangential standby feeder line of main feeder, and also can be by the tangential main feeder of standby feeder line.Improper situation refers to bus dead electricity and two kinds of operating modes of main feeder switch mis-jumping.
1, bus dead electricity
When the bus three-phase line voltage all is lower than setting value and time greater than setting value, then device switching simultaneously.Its switching condition switches identical with switch logic with the accident of protection starting.
2, switch mis-jumping
Because of a variety of causes (comprising that the people is misoperation) causes main feeder (standby feeder line) switch mis-jumping to open, device is after satisfying the switching criterion, and standby feeder line (main feeder) switch closes.This switching has: fast, homophase, residual voltage, long delay switch criterion for four kinds, no disturbance stabilization control device switch fast change homophase automatically over to when unsuccessful, residual voltage is switched and the long delay switching.If starting back standby feeder line (main feeder) switch does not close, device is sent out handoff failure and device block signal simultaneously with locking.
Four, starting after accelerated protection function
When device switches to standby feeder switch, export a pair of idle contact simultaneously, be used to drop into the after accelerated protection function of standby feeder line branch protective device, the junction closure duration is 5 seconds.Totally three pairs of starting post acceleration idle contacts, respectively corresponding feeder line one protection, feeder line two protections and female connection protection.
Five, locking and warning function
1 protection locking
For preventing that standby feeder line from miscarrying into fault bus; device provides the protection locking to open into the amount interface loop, when some protection action (as main feeder protection itself, as overcurrent, arclight bus protection etc.); device provides the locking outlet loop simultaneously " protection locking " signal and waits for involution.
2, go out atretostomia
When device dropped into because of soft pressing plate input or control desk (or DCS) locking device, device was with the locking outlet and provide the outlet block signal, as installed that soft pressing plate withdraws from or during control desk (or DCS) unlocking, device will automatically terminate locking, resume operation.Install that soft pressing plate comprises that outlet drops into/withdraw from and install that quick switching, homophase are switched, residual voltage is switched, long delay switches and drops into respectively/withdraw from.
3, the position of the switch reaches uncoupling unusually
Device ceaselessly the state of all switches is checked, as it is unusual to detect the position of the switch when normal operation, and when promptly not satisfying the ready condition of the moving stabilization control device of unperturbed, device is sent out position of the switch abnormal signal simultaneously with the locking outlet.In (operating switch mistake jump except) handoff procedure as the switch of finding this jumping in the certain hour not tripping maybe this switch that closes do not close, the malposition block signal be handled and be provided to device will respectively according to different switching modes.As: in switch switching simultaneously, if the switch of this tripping is failed tripping, will cause two power supplys arranged side by side, device will be carried out the uncoupling function, the switch that tripping has just been closed this moment.
Promptly all the time some vitals such as CPU, RAM, NVRAM, EEPROM, AD etc. are carried out dynamic self-checking after device drops into,, send out " device is unusual " signal simultaneously in case fault is arranged with locking device.
When bus I section, bus II section PT broken string, device provides the PT break alarm simultaneously with the locking outlet.
If standby feeder line power supply (main feeder power supply) is when dead electricity is lower than setting value, device provides alarm signal simultaneously with the automatic blocking outlet.Consider the situation of standby feeder line PT maintenance, can select " locking of reserve dead electricity " function to withdraw from the back and realize the residual voltage switching.
Six, device locking
Under following several situations, need device is carried out the involution operation, in order to move next time:
1, carried out after accident switches;
2, send block signals such as the position of the switch is unusual, protection locking, PT broken string after, and for recovering automatically;
3, after device breaks down.
At this moment, will not respond any peripheral operation and initiating signal, manually involution is removed, and still exists as locking or fault, and it is just effective to need pending fault or barring condition to eliminate the back involution.
The output of device Switching Power Supply+5V, ± 15V, the arbitrary road of+24V dead electricity all will cause operation irregularity, ad hoc monitoring voltage loop, in case dead electricity is reported to the police immediately, this function adopts relay to realize, does not rely on CPU work.
Claims (3)
1, a kind of no disturbance stabilization control device (I), it comprises high-tension apparatus and control appliance, it is characterized in that:
Described high-tension apparatus comprises the electric power system of double-fed line configuration, main feeder is powered to bus I section, standby feeder line is powered to bus II section, the current transformer that the double-fed line is respectively equipped with, voltage transformer and circuit breaker, and bus section, busbar section I section and bus II section are respectively equipped with voltage transformer and isolating switch; Connect by bus between bus I section and the bus II section;
Described control appliance comprises the host CPU controller, from cpu controller, power module, management module;
The voltage transformer of the current transformer of above-mentioned double-fed line and mutual induction of voltage, bus section, busbar section connects the signal input part of host CPU controller respectively, circuit breaker and isolating switch connect the control end of host CPU, communication mutually between the master and slave cpu controller is carried out communication between management module and the host computer.
2, no disturbance stabilization control device according to claim 1 (I) is characterized in that: described management module comprises display module, print module and communication module.
3, no disturbance stabilization control device according to claim 1 (I) is characterized in that: comprise display, printer, gps system, DCS system and other smart machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920038070U CN201374585Y (en) | 2009-01-16 | 2009-01-16 | Undisturbed stability control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920038070U CN201374585Y (en) | 2009-01-16 | 2009-01-16 | Undisturbed stability control device |
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| CN201374585Y true CN201374585Y (en) | 2009-12-30 |
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| CN200920038070U Expired - Fee Related CN201374585Y (en) | 2009-01-16 | 2009-01-16 | Undisturbed stability control device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723773A (en) * | 2011-10-31 | 2012-10-10 | 中国石油化工股份有限公司 | Frequency changing direction-based synchronization capturing closing method of rapid power switching apparatus |
| CN103023133A (en) * | 2012-12-04 | 2013-04-03 | 施耐德万高（天津）电气设备有限公司 | Dual power supply automatic changeover gear controller |
| CN104079063A (en) * | 2014-07-14 | 2014-10-01 | 江西长天轨道交通设备有限公司 | High-voltage interconnection switchover system and method |
| CN107026504A (en) * | 2017-04-12 | 2017-08-08 | 山东电力工程咨询院有限公司 | Consider thermal power plant's low-tension supply switching method of motor cluster speed-drop characteristic |
| CN112787650A (en) * | 2020-12-30 | 2021-05-11 | 国网河北省电力有限公司 | Method and device for rapidly judging three-phase position of isolating switch |
-
2009
- 2009-01-16 CN CN200920038070U patent/CN201374585Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723773A (en) * | 2011-10-31 | 2012-10-10 | 中国石油化工股份有限公司 | Frequency changing direction-based synchronization capturing closing method of rapid power switching apparatus |
| CN103023133A (en) * | 2012-12-04 | 2013-04-03 | 施耐德万高（天津）电气设备有限公司 | Dual power supply automatic changeover gear controller |
| CN104079063A (en) * | 2014-07-14 | 2014-10-01 | 江西长天轨道交通设备有限公司 | High-voltage interconnection switchover system and method |
| CN104079063B (en) * | 2014-07-14 | 2016-05-04 | 北京太格时代自动化系统设备有限公司 | One is pressed mutual switched system and is pressed mutual changing method |
| CN107026504A (en) * | 2017-04-12 | 2017-08-08 | 山东电力工程咨询院有限公司 | Consider thermal power plant's low-tension supply switching method of motor cluster speed-drop characteristic |
| CN107026504B (en) * | 2017-04-12 | 2019-10-25 | 山东电力工程咨询院有限公司 | Consider thermal power plant's low-tension supply switching method of motor cluster speed-drop characteristic |
| CN112787650A (en) * | 2020-12-30 | 2021-05-11 | 国网河北省电力有限公司 | Method and device for rapidly judging three-phase position of isolating switch |
| CN112787650B (en) * | 2020-12-30 | 2022-09-13 | 国网河北省电力有限公司 | Method and device for rapidly judging three-phase position of isolating switch |
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