CN206877795U - A kind of distribution transformer voltage-regulating system - Google Patents
A kind of distribution transformer voltage-regulating system Download PDFInfo
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- CN206877795U CN206877795U CN201720588197.4U CN201720588197U CN206877795U CN 206877795 U CN206877795 U CN 206877795U CN 201720588197 U CN201720588197 U CN 201720588197U CN 206877795 U CN206877795 U CN 206877795U
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Abstract
A kind of distribution transformer voltage-regulating system is the utility model is related to, belongs to electrical equipment technical field.In the system, each tap-changing windings in A phase windings, B phase windings and C phase windings connect main winding after distinguishing series voltage-regulating switch；Current limiting branch road in parallel with respectively there is a tap changer in A phase windings, B phase windings and C phase windings and protection branch road；Tap changer by two reverse parallel connections thyristor groups into；Current limliting branch route the Thyristors in series transition resistance composition of two reverse parallel connections；Protect the resistance to piezoresistance composition of branch route A.C. contactor series connection；Voltage transformer is mounted on a phase windings, b phase windings and c phase windings.Distribution transformer voltage-regulating system provided by the utility model, become load ratio bridging switch by the use of the IGCT of reverse parallel connection as distribution, during switching branch joint, compared with traditional mechanical shunting switch, IGCT switch speed is faster, transient process is relatively reliable, stably, is advantageous to improve quality of voltage.
Description
Technical field
A kind of distribution transformer voltage-regulating system is the utility model is related to, belongs to electrical equipment technical field.
Background technology
At present, many outskirts of a town, in distribution network line end, are damaged with Rural Power Distribution Network away from power transformation maincenter by circuit
The influence of the factors such as consumption, load variations, there are still low pressure or the underproof problem of voltage.Distribution transformer pressure regulation is stable negative
A kind of important means of lotus center voltage.In voltage pulsation under conditions of idle abundance, pass through switching transformer loaded tap-off
Switch to adjust distribution voltage.But due to 10kV distribution transformers enormous amount and majority is not equipped with on-load shunting switch, can not
Distribution transforming output voltage is automatically adjusted.
The a small amount of load tap changing distribution transformer to be come into operation at this stage in distribution is also made using mechanical switch substantially
For load ratio bridging switch.For mechanical switch with the generation of electric arc during switching branch joint, responsiveness is slow, during pressure regulation
Quarter can not accurately control, and fault rate is high.
Disclosed in Application No. CN201410107456.8 utility model patent file a kind of entitled " contactless to have load
The technical scheme of the startup of automatic Regulation distribution transformer and transition branch road ".The patent is using anti-parallel thyristor as distribution
The load ratio bridging switch of transformer, single-chip microcomputer carry out triggering control according to high voltage side of transformer voltage change to IGCT, so as to
Realize voltage-regulation.With the characteristics of reliability is high, transit time is short.But the distribution that the patent is Yy for connection group number becomes
Depressor, and Yy distribution transformer is having the shortcomings that imbalance of three-phase voltage in the case of three-phase load unbalance, at present
It is phased out, the substitute is Dy type distribution transformers.
The content of the invention
The utility model will solve technical problem：The shortcomings that overcoming above-mentioned technology.A kind of power application electronic cutting is provided
Close the pressure-adjustable distribution transformer system as shunting switch.
In order to solve the above-mentioned technical problem, the utility model proposes technical scheme be：A kind of distribution transformer pressure regulation system
System, A phase windings, B phase windings and C phase windings, the low-pressure side that there is triangle to connect for the high-pressure side of the distribution transformer have Y
Shape connection a phase windings, b phase windings and c phase windings；The A phase windings, B phase windings and C phase windings have main winding respectively, and
Some tap-changing windings；After each tap-changing windings difference series voltage-regulating switch in the A phase windings, B phase windings and C phase windings
Connect the main winding；Current limiting in parallel with respectively there is the tap changer in the A phase windings, B phase windings and C phase windings
Branch road and protection branch road；The tap changer by two reverse parallel connections thyristor groups into；The current limliting branch route two reversely
Thyristors in series transition resistance composition in parallel；The resistance to piezoresistance composition of protection branch route A.C. contactor series connection；The a phases
Voltage transformer is mounted on winding, b phase windings and c phase windings；The output of the voltage transformer is connected with microprocessor；
The output end of the microprocessor is connected with drive module；The IGCT is driven by the drive module.
Such scheme, which further improves, to be：Analog-to-digital conversion mould is connected between the voltage transformer and microprocessor
Block.
Such scheme, which further improves, to be：The microprocessor is also associated with alarm module.
Distribution transformer voltage-regulating system provided by the utility model, compared with prior art, with the brilliant lock of reverse parallel connection
Pipe becomes load ratio bridging switch as distribution, and IGCT has the spy that capacity is big, can be worked under conditions of high voltage, high current
Point.During switching branch joint, compared with traditional mechanical shunting switch, IGCT switch speed faster, is crossed and tided over
Journey is relatively reliable, stably, is advantageous to improve quality of voltage；The automatic loaded voltage regulation to distribution transformer can be realized.This practicality
Novel pin carries out pressure regulation design to Dy types distribution transformer, can be used widely on existing Dy types distribution transformer.
Brief description of the drawings
The utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the electrical block diagram of a preferred embodiment of the utility model embodiment.
Embodiment
Embodiment
The distribution transformer voltage-regulating system of the present embodiment, the present embodiment is with ± 1 × 5%UN Dy type distribution transformer taps system
Exemplified by system；Such as Fig. 1, the high-pressure side of distribution transformer has A phase windings, B phase windings and C phase windings that triangle connects, low pressure
Side has Y shape connection a phase windings, b phase windings and c phase windings；A phase windings, B phase windings and C phase windings have main winding respectively
W0 and tap-changing windings W1, W2, W3；Wherein tap-changing windings W1, W2, the rated voltage that W3 is exported respectively be 95%UN, 100%UN,
105%UN；Each tap-changing windings in A phase windings, B phase windings and C phase windings connect main winding after distinguishing series voltage-regulating switch；With A
Respectively there are a tap changer parallel connection current limiting branch road and protection branch road in phase winding, B phase windings and C phase windings；Tap changer by
The thyristor groups of two reverse parallel connections into；Current limliting branch route the Thyristors in series transition resistance composition of two reverse parallel connections；Protection
The resistance to piezoresistance composition of branch route A.C. contactor series connection；Mutual induction of voltage is mounted on a phase windings, b phase windings and c phase windings
Device；The output of voltage transformer is connected with microprocessor；The output end of microprocessor is connected with drive module；IGCT is by driving
Module drive.
As shown in FIG., tap changer K1.A, K1.B, K1.C is respectively tap of transformer A, B, C three-phase at 95%UN
Switch；Tap changer K2.A, K2.B, K2.C are respectively shunting switch of A, B, C three-phase at 100%UN；Tap changer K4.A,
K4.B, K4.C are respectively shunting switch of A, B, C three-phase at 105%UN.
During pressure regulation, Transformer Winding forms closed-loop path with IGCT, can produce very big dash current, be
IGCT is avoided to damage, tap changer that the tap-changing windings W2 in A phase windings, B phase windings and C phase windings is connected, namely
It is that tap changer K2.A, K2.B, K2.C distinguish current limiting branch road in parallel.Current limliting branch route the Thyristors in series of two reverse parallel connections
Transition resistance forms.As shown in FIG., the IGCT K3.A and transition resistance RG.A of reverse parallel connection are composed in series current limliting branch road, and
It is associated in tap changer K2.A both ends；IGCT K3.B and transition resistance RG.B the composition current limliting branch road of reverse parallel connection, are connected in parallel on tune
Compress switch K2.B both ends；The IGCT K3.C and transition resistance RG.C of reverse parallel connection are composed in series current limliting branch road, are connected in parallel on pressure regulation
Switch K2.C both ends.
Before Transformer Close, IGCT does not turn on, and is in off state.Voltage damage during to avoid Transformer Close
Bad IGCT, the tap changer that the tap-changing windings W2 in A phase windings, B phase windings and C phase windings is connected, that is to say that pressure regulation is opened
Close K2.A, K2.B, K2.C and be also parallel with protection branch road respectively；Protect the resistance to piezoresistance composition of branch route A.C. contactor series connection.Hand over
The protection branch road for the Startup time that the stream contactor KM.A and R0.A of resistance to piezoresistance is composed in series, is connected in parallel on tap changer K2.A two
End；The protection branch road for the Startup time that the A.C. contactor KM.B and R0.B of resistance to piezoresistance is composed in series, is connected in parallel on tap changer
K2.B both ends；The protection branch road for the Startup time that the A.C. contactor KM.C and R0.C of resistance to piezoresistance is composed in series, is connected in parallel on pressure regulation
Switch K2.C both ends.
Voltage transformer is mounted on a phase windings, b phase windings and c phase windings；The output of voltage transformer is connected with micro-
Processor；The output end of microprocessor is connected with drive module；IGCT is driven by drive module.In the present embodiment, microprocessor
Device that is to say single-chip microcomputer.
If do not have the microprocessor of A/D translation functions using some, between voltage transformer and microprocessor
Analog-to-digital conversion module is set.Microprocessor is also associated with alarm module.
When transformer prepares to close a floodgate, A.C. contactor KM.A, KM.B and KM.C are closed first.After closure, transformer closes
Lock.Now, the voltage of high voltage side of transformer is all applied on the R0.A of resistance to piezoresistance, R0.B and R0.C, so as to avoid high straightening
Connect and be applied on IGCT, protect IGCT.Now step down side is powered, to each phase W2 tap changers connected
IGCT sends control signal, triggers turn on thyristors, that is to say that tap changer K2.A, K2.B, K2.C are turned on；Then, disconnect
A.C. contactor KM.A, KM.B and KM.C, disconnect protection branch road.Now turn on thyristors, A.C. contactor turn off, at transformer
In normal operating condition, start-up course is completed.
Specific automatic loaded voltage regulation process, so that now low-pressure side voltage is too high, it is necessary to turn down voltage as an example.If now adjust
Compress switch K2.A, K2.B and K3.C conducting, then need conducting connection high voltage gear tap changer K1.A, K1.B and
K1.C.During shunting switch is switched, switch K3.A, K3.B and K3.C of current limliting branch road are triggered first；Delayed at one section
Treat that K3.A, K3.B and K3.C are turned on, stop triggering K2.A, K2.B and K3.C；Delayed during another section triggering K1.A, K1.B and
K1.3；After one section of time delay after K1.A, K1.B and K1.C conducting, stop triggering K3.A, K3.B and K3.C.Now only have
K1.A, K1.B and K1.C are in the conduction state, so as to complete transient process.
The monitoring system of distribution transformer automatic loaded voltage regulation system is connected to the low-pressure side of transformer.To realize the work(of pressure regulation
Energy, it is necessary to monitor, and the electronic power switch of each phase in high-pressure side is entered respectively in real time to each phase voltage of step down side
Row control.Voltage transformer both ends are connected between each phase of step down side and the neutral conductor respectively, pass through voltage transformer
The phase voltage of each phase of low-pressure side is gathered, and each phase voltage signal is passed into single-chip microcomputer using analog-to-digital conversion module.Monolithic
Machine by the voltage swing collected compared with normal voltage range set in advance, according to comparative result judge this moment whether
Need pressure regulation.
Voltage regulating mode is voltage regulating mode step by step；When monitoring low-pressure side voltage U2<During 95%UN, the tune of higher gear is controlled
Compress switch conducting；If now voltage U2 is still below 95%UN, continue to control the tap changer conducting of higher gear.If now
The tap changer of highest gear has been turned on, and can not continue to heighten voltage, and voltage does not recover to normal voltage yet, then sends report
Alert signal.When monitoring low-pressure side voltage U2a>During 105%UN, the tap changer conducting compared with low-grade location is controlled；If now voltage U2
105%UN is remained above, then the tap changer for continuing control compared with low-grade location turns on.If now the tap changer of lowest gear is
Conducting, can not continue to turn down voltage, and voltage does not recover to normal voltage yet, then sends alarm signal.
The utility model is not limited to the concrete technical scheme of above-described embodiment, in addition to the implementation, the utility model
There can also be other embodiment.All technical schemes formed using equivalent substitution, it is the protection model of the requires of the utility model
Enclose.
Claims (3)
1. a kind of distribution transformer voltage-regulating system, the high-pressure side of the distribution transformer has A phase windings, B that triangle connects
Phase winding and C phase windings, low-pressure side have Y shape connection a phase windings, b phase windings and c phase windings；The A phase windings, B phase windings
There are main winding and some tap-changing windings respectively with C phase windings；It is characterized in that：The A phase windings, B phase windings and C phase windings
In each tap-changing windings distinguish series voltage-regulating switch after connect the main winding；With the A phase windings, B phase windings and C phases
Respectively there are a tap changer parallel connection current limiting branch road and protection branch road in winding；The tap changer is by two reverse parallel connections
Thyristor groups into；The current limliting branch route the Thyristors in series transition resistance composition of two reverse parallel connections；The protection branch road
It is made up of A.C. contactor resistance to piezoresistance of connecting；Mutual induction of voltage is mounted on a phase windings, b phase windings and c phase windings
Device；The output of the voltage transformer is connected with microprocessor；The output end of the microprocessor is connected with drive module；It is described
IGCT is driven by the drive module.
2. distribution transformer voltage-regulating system according to claim 1, it is characterised in that：The voltage transformer and microprocessor
Analog-to-digital conversion module is connected between device.
3. distribution transformer voltage-regulating system according to claim 1, it is characterised in that：The microprocessor is also associated with reporting
Alert module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720588197.4U CN206877795U (en) | 2017-05-25 | 2017-05-25 | A kind of distribution transformer voltage-regulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720588197.4U CN206877795U (en) | 2017-05-25 | 2017-05-25 | A kind of distribution transformer voltage-regulating system |
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| Publication Number | Publication Date |
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| CN206877795U true CN206877795U (en) | 2018-01-12 |
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| CN201720588197.4U Active CN206877795U (en) | 2017-05-25 | 2017-05-25 | A kind of distribution transformer voltage-regulating system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134348A (en) * | 2017-05-25 | 2017-09-05 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer voltage-regulating system |
| CN109599257A (en) * | 2018-12-24 | 2019-04-09 | 上海良治电器技术有限公司 | Input adjustable transformer |
| WO2023245742A1 (en) * | 2022-06-20 | 2023-12-28 | 国网江苏省电力有限公司电力科学研究院 | Thyristor-based arc-free on-load voltage regulation switch device for distribution transformer |
-
2017
- 2017-05-25 CN CN201720588197.4U patent/CN206877795U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134348A (en) * | 2017-05-25 | 2017-09-05 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer voltage-regulating system |
| CN109599257A (en) * | 2018-12-24 | 2019-04-09 | 上海良治电器技术有限公司 | Input adjustable transformer |
| WO2023245742A1 (en) * | 2022-06-20 | 2023-12-28 | 国网江苏省电力有限公司电力科学研究院 | Thyristor-based arc-free on-load voltage regulation switch device for distribution transformer |
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