CN1725618A - Contactless on-load automatic regulating distribution transformer - Google Patents
Contactless on-load automatic regulating distribution transformer Download PDFInfo
- Publication number
- CN1725618A CN1725618A CN 200410043740 CN200410043740A CN1725618A CN 1725618 A CN1725618 A CN 1725618A CN 200410043740 CN200410043740 CN 200410043740 CN 200410043740 A CN200410043740 A CN 200410043740A CN 1725618 A CN1725618 A CN 1725618A
- Authority
- CN
- China
- Prior art keywords
- voltage
- contactless
- distribution transformer
- control system
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
A distribution transformer of contact-less on-load voltage regulation consists of contact-less tapping switch and monolithic computer control system. It is featured as leaving three taps with rated voltage of ( UN ), 95 % UN and 105 % UN at neutral point side on high voltage winding of the transformer, connecting zero passage solid relay SSR as contact-less tapping switch to place between each tap and neutral point connecting voltage value at low voltage side of power transformer T output to monolithic computer control system and connecting output end of said system to control loop of solid relay SSR .
Description
(1), affiliated field
What the present invention relates to is distribution transformer, the distribution transformer that has certain automatic voltage regulation function in specifically a kind of electric power system.
(2), background technology
The present distribution transformer overwhelming majority (more than 99%) all adopts no-load also to claim non-excitation pressure adjustment, promptly must under power down mode, change high pressure winding work tap and then realize pressure regulation, because of regulating inconvenience, the almost annual position that only when distribution transformer overhauls, just redefines tap according to existing operating experience.Every day is because the fluctuation of load makes the voltage of distribution transformer secondary side that bigger variation, voltage instability be arranged like this.Only and other distribution transformer on install on-load voltage regulating switch, this switch mostly has been the contact mechanical type or has contactlessly had the contact hybrid.Though their energy on-load voltage regulation, make Circuit Fault on Secondary Transformer voltage more stable, but this distribution transformer complex structure, bulky reliability is low, and cost is than the distribution transformer high 50% of the same capacity of non-excitation pressure adjustment even several times, and this distribution transformer can not frequent movement, and performance is also relatively poor.
Application number be disclose in 98115448.4 the patent of invention file a kind of, name is called the technical scheme of " non-contact electronic on-load voltage regulator for electric power transformer ", this device adopts bidirectional thyristor as noncontacting switch, control loop and low-pressure side are irrelevant, its advantage is the problem of withstand voltage of control loop control loop need not consider the high-pressure side single-phase earthing time, and when the mains side change in voltage, can realize on-load voltage regulation by detecting the voltage of regulating between the winding tap high-pressure side, but the variation control loop of the Circuit Fault on Secondary Transformer voltage that causes when load variations really can't react, and voltage fluctuation mainly is that to be used for load variations caused, so this on-load voltage regulating device voltage regulation result is poor; On the other hand, it adopts bidirectional thyristor as noncontacting switch, makes the control circuit complexity, has reduced the reliability of device; This patent application simultaneously is as a self-contained unit with " transformer non-contact electronic on-load voltage regulator ", with the supporting use of power transformer, make whole on-load tap-changing transformer system configuration huge, cost is higher, the distribution transformer that the capacity that is not suitable for is less.
(3), summary of the invention
The object of the present invention is to provide a kind of simple in structure, cost is low, reliability is high, the contactless loaded automatic voltage-regulating distribution transformer of good stability.
The object of the present invention is achieved like this: it comprises contactless shunting switch and single-chip computer control system, and distribution transformer body high pressure winding leaves rated voltage (U in neutral point side
N), 95%U
NAnd 105%U
NThree taps, between each tap and neutral point, be connected to zero-cross ssr SSR as contactless shunting switch, the low-pressure side winding of measuring the working power transformer T output of holding concurrently inserts computer supervisory control system, and the output of computer supervisory control system connects the control loop of the solid-state relay SSR of contactless shunting switch.
The present invention can also comprise some architectural features like this:
1, is parallel with the appearance resistance of forming by resistance R and capacitor C at each SSR two ends and absorbs circuit.
2, serial connection Wound-rotor type resistance R in solid-state relay SSR2 branch road
X
3, before monolithic processor control system, be provided with the storage battery start-up circuit that constitutes by control switch K and storage battery E.
4, measuring the working power transformer T that holds concurrently is connected between the arbitrary phase of load side (the routine a phase) leading-out terminal and neutral line n leading-out terminal of distribution transformer.
5; the double power transformer T secondary side measurement of the measurement winding T1 that constitutes of monolithic processor control system meets rectifier bridge ZL1; the minus earth of direct current; again through RC П type filtering after in parallel with the filtering output capacitance adjust potentiometer W1 and protection voltage-stabiliser tube D38 receive the 3rd pin of A/D conversion chip U7; U7 gives single-chip microcomputer U16 through serial mode with the A/D transformation result; U16 sends the triggering signal that triggers corresponding solid-state relay through P0 and P2 mouth; this signal is through chip for driving U5; after U6 drives; import corresponding direct current relay, the positive pole of the control loop of all solid-state relays connects on the control board+the 12V power supply.
6, contactless shunting switch and single-chip computer control system are installed in the conservator of transformer.
Compared with the prior art main feature of the present invention is embodied in:
1, by zero-cross ssr (rather than bidirectional thyristor) as contactless shunting switch, shunting switch is connected between each tap and the neutral point;
2, constitute computer supervisory control system with the higher relatively 89C52 single-chip microcomputer of a ratio of performance to price, by this supervisory control system according to Circuit Fault on Secondary Transformer (380V side) voltage U that records
2Control the conducting and the shutoff of each shunting switch, monolithic processor control system is by the power supply of distribution transformer low-pressure side and detect low-pressure side voltage, can come automatic adjustment work tap according to the voltage of load side like this, realize on-load voltage regulation, reach the purpose of automatic stabilisation transformer output voltage;
3, adopt the startup power supply of storage battery, to guarantee making the solid-state relay that links to each other with the rated voltage tap remain on conducting state when the firm making alive of transformer as monolithic processor control system;
4, at existing distribution transformer basic structure and fuel tank size constancy, change the oil circuit between fuel tank and the conservator into cross section and be not less than 6400mm
2Rectangle or circular oil circuit, conservator changes semicylinder into, so that guide to tap lead in the conservator and noncontacting switch plate and control section are installed in conservator;
5, noncontacting switch and computer supervisory control system are installed in the conservator, constitute the distribution transformer with automatic voltage regulation function of electromechanical integration, reduce machine volume and cost, prevent that also winter temperature is low excessively, the integrated circuit job insecurity simultaneously.
Research and experiment of the present invention chamber simulation practice proves, this device has contact automatic loaded voltage regulation distribution transformer to compare with present mechanical type, have and do not have electric arc in the adjustment process, governing speed is fast, but frequent movement is safe and reliable, advantages such as the low life-span of cost is long, example is to the distribution transformer of 1000kVA, and the present invention compares with No-load changer, and the cost raising is not more than 5%.(application number: 98115448.4) " non-contact electronic on-load voltage regulator for electric power transformer " of Gong Buing compared and with the application for a patent for invention prospectus, have can according to the load variation and the characteristics of automatic voltage regulation, and whole noncontacting switch and control circuit thereof all are contained in the distribution transformer conservator, constituted the distribution transformer of an automatic voltage regulation, compact conformation, cost are also low, and adopt solid-state relay to replace bidirectional thyristor, it is more reliable to work, and voltage regulation performance is better.
(4), description of drawings
Fig. 1 is a key wiring diagram of the present invention;
Fig. 2 is a monolithic processor control system schematic diagram of the present invention;
Fig. 2 is an automatic loaded voltage regulation flow chart of the present invention;
Fig. 4 is a structural representation of the present invention.
Fig. 5 scheme of installation of the present invention;
Fig. 6 the present invention measures the power transformer schematic diagram of holding concurrently.
(5), specific embodiments
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, distribution transformer body high pressure winding leaves rated voltage (U in neutral point side
N), 95%U
NAnd 105%U
NThree taps, the zero-cross ssr SSR that is connected to rated voltage 660V45A between each tap and neutral point is as contactless shunting switch, computer supervisory control system sends the pulse of triggering as the solid-state relay SSR of contactless shunting switch according to measuring the low-pressure side magnitude of voltage that the working power transformer T that holds concurrently provides.Reach steady load side voltage U
2Purpose.Solid-state relay is out of control in order to prevent to change tap, and this device adopts the resistance capaciting absorpting circuit RC in parallel at each SSR two ends, when changing tap to be limited in, and the climbing of solid-state relay both end voltage.Produce big circulation in the winding when changing tap for limiting between two taps, the present invention adopts the method for single resistor transition, promptly is connected in series the Wound-rotor type resistance R of 25W5 Ω at the solid-state relay SSR2 branch road that is used for transition
X, when each change tap (promptly changing the SSR of conducting), SSR-R all records a demerit
XThe branch road transition, example is because U
2Descend, become the SSR1 conducting, to improve U by the SSR3 conducting
2Value, then conversion process is: when voltage zero-cross, give the SSR2 trigger voltage, make the SSR2 conducting, remove the trigger voltage of SSR3 simultaneously, SSR3 turn-offs when the SSR3 current over-zero, when next voltage zero-cross, give the SSR1 trigger voltage, make its conducting, remove the trigger voltage of SSR2 simultaneously, when among the SSR2 during current over-zero, SSR2 turn-offs, and finishes linear transformation, and each conversion time is no more than 10ms.When preventing that transformer from just having powered on, low-pressure side does not have voltage to make computer supervisory control system not have pulse output, cause whole SSR all to be in off state, distribution transformer can't start, SSR will be punctured, for this this circuit is provided with the storage battery start-up circuit, before transformer will drop into, earlier by with regard to manipulable control switch K storage battery E (4 ampere-hour) being dropped in the transformer outside, make computer supervisory control system work, make the SSR3 of three-phase all be in conducting state, and then distribution transformer is put into operation, enter the automatic Regulation state after this.When transformer idle time was lacked (in 24 hours), K can be in closure state always, just need not operate K again when putting into operation so again.Measuring the working power transformer T that holds concurrently is connected between load side (low-pressure side) a and neutral line n of distribution transformer, so that directly react the magnitude of voltage of the secondary side of transformer.
In conjunction with Fig. 2; measure the power transformer secondary side measurement winding T1 that holds concurrently the voltage that records is obtained pulsating direct current after rectifier bridge ZL1 rectification; the negative pole of direct current is public ground; again through RC П type filtering after the adjust potentiometer in parallel (1k Ω) and protect voltage-stabiliser tube (5.1V) to be sent to the 3rd pin of A/D conversion chip U7, so between the 3rd pin of U7 and ground, just obtain one and U with the filtering output capacitance
2The amplitude that is directly proportional is not more than the direct voltage of 5V, and under the control of single-chip microcomputer U16, just 16 pin (DO end) at U7 have obtained one and U
2Proportional digital signal, this digital signal is sent to single-chip microcomputer through 10 pin (P3.0) of U16, through comparing with set point, U16 sends the triggering signal that triggers corresponding solid-state relay through P0 and P2 mouth, this signal is through chip for driving U5, after U6 drives, start corresponding direct current relay, when this direct current relay action, its normally opened contact closure, make minus earth through control plug and solid-state relay control loop, and the positive pole of the control loop of all solid-state relays all with+the 12V power supply links to each other, so the minus earth of which solid-state relay control loop, that is with regard to conducting, otherwise just is in off state.So just realized according to U
2Size changes the solid-state relay of conducting automatically and then realizes on-load voltage regulation, the purpose of regulated output voltage.
In conjunction with Fig. 3, before distribution transformer of the present invention puts into operation, will forward make position at the control switch K of conservator side earlier, with the storage battery input, computer supervisory control system is devoted oneself to work, and the SSR3 conducting detects the loop and detects the step down side voltage U
2, work as U
2In the time of in allowed band, remain the SSR3 conducting, but work as U
2In the time of not in allowed band, must change the SSR of conducting, if U
2Be lower than 97%U
2NThe time, then should make the SSR1 conducting, in the process of the conversion tap that is become the SSR1 conducting by the SSR3 conducting, the electric current of transformer does not interrupt flowing only, and keeps sinusoidal waveform, by detecting U
2The voltage zero-cross time of indirect detection SSR, when the SSR voltage zero-cross, trigger voltage is imposed on the control utmost point rather than the SSR3 that string has the SSR2 of current-limiting resistance, like this when voltage zero-cross, SSR3 and SSR2 conducting simultaneously, when current over-zero, SSR3 closes automatically, in the next zero passage of voltage constantly, does not give the SSR2 trigger voltage to the SSR1 trigger voltage, at this moment SSR1 and SSR2 conducting simultaneously, because the effect of current-limiting resistance makes loop circulation in the scope of a permission, when the loop current zero passage, SSR2 automatically shuts down, and finishes the conversion of a tap.If after closing a floodgate, detect voltage U
2, work as U
2When being higher than permissible value, should make the SSR4 conducting, SSR3 turn-offs, and detailed process and aforementioned similar is not being given unnecessary details.Each phase SSR adopts the phase-splitting triggering mode, and promptly after A phase SSR sent trigger voltage, time-delay 6.7ms sent trigger voltage to the same SSR of B phase again, sends out trigger voltage to C phase SSR behind the 6.7ms that delays time again.
In conjunction with Fig. 4, Fig. 5, contactless shunting switch SSR, resistance capaciting absorpting circuit, current-limiting resistance all are contained on the bakelite insulation board, and AC terminal and the control end of each SSR are received respectively on the corresponding terminal board; Monolithic processor control system wiring board and storage battery are fixed on the reverse side of noncontacting switch plate, and this mounting panel is installed in the conservator, and should guarantee all components and parts withstand voltage more than 40kV to shell; The tap of distribution transformer high pressure winding is linked to each other by the terminal board of the contactless shunting switch plate of fuel tank in the oil circuit between conservator and the fuel tank and conservator; Draw a mutually phase voltage at low-pressure side a phase leading-out terminal with the exit of neutral line n with insulated conductor, oil circuit between fuel tank and conservator is sent in the conservator, link to each other with the measurement power transformer of holding concurrently in being placed on conservator, with the power supply that single-chip microcomputer is provided and the voltage signal of low-pressure side.
In conjunction with Fig. 6, W is for measuring the first side winding of power transformer of holding concurrently, and rated voltage is the specified phase voltage 231V of distribution transformer secondary side; W1 is for measuring winding, and rated voltage is that 5V is in order to measure distribution transformer secondary side voltage; W2 is a solid-state relay control main power source winding, and rated voltage is 15V, in order to the control voltage of solid-state relay to be provided; W3 is a monolithic processor control system control board main power source winding, and rated voltage is 9V, in order to the control board power supply to be provided; W4 is a charge in batteries voltage winding, and rated voltage is 9V, charges a battery when system's operate as normal.
Claims (7)
1, a kind of contactless loaded automatic voltage-regulating distribution transformer, it comprises contactless shunting switch and single-chip computer control system, it is characterized in that: distribution transformer body high pressure winding leaves rated voltage U in neutral point side
N, 95%U
NAnd 105%U
NThree taps, between each tap and neutral point, be connected to zero-cross ssr SSR as contactless shunting switch, the low-pressure side magnitude of voltage of measuring the working power transformer T output of holding concurrently inserts monolithic processor control system, and the output of monolithic processor control system connects the control loop as the solid-state relay SSR of contactless shunting switch.
2, contactless loaded automatic voltage-regulating distribution transformer according to claim 1 is characterized in that: be parallel with the appearance resistance of being made up of resistance R and capacitor C at each SSR two ends and absorb circuit.
3, contactless loaded automatic voltage-regulating distribution transformer according to claim 2 is characterized in that: serial connection Wound-rotor type resistance R in solid-state relay SSR2 branch road
X
4, contactless loaded automatic voltage-regulating distribution transformer according to claim 3 is characterized in that: be provided with the storage battery start-up circuit that is made of control switch K and storage battery E before monolithic processor control system.
5, contactless loaded automatic voltage-regulating distribution transformer according to claim 4 is characterized in that: the working power transformer T that measure to hold concurrently is connected between the arbitrary phase leading-out terminal and neutral line n of load side of distribution transformer.
6, contactless loaded automatic voltage-regulating distribution transformer according to claim 5, it is characterized in that: the double power transformer T secondary side measurement of the measurement winding W1 that constitutes of monolithic processor control system meets rectifier bridge ZL1, the minus earth of direct current, process RC ∏ type filtering is after the adjust potentiometer W1 in parallel with the filtering output capacitance receives the 3rd pin of modulus conversion chip U7 again, U7 and single-chip microcomputer U16 are interconnected, U16 sends the triggering signal that triggers corresponding solid-state relay through P0 and P2 mouth, this signal is through chip for driving U5, after U6 drives, import corresponding direct current relay, the positive pole of the control loop of all solid-state relays connects on the control board+the 12V power supply.
7, according to any one described contactless loaded automatic voltage-regulating distribution transformer of claim 1-6, it is characterized in that: contactless shunting switch and single-chip computer control system are installed in the conservator of transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410043740XA CN100511947C (en) | 2004-07-23 | 2004-07-23 | Contactless on-load automatic regulating distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410043740XA CN100511947C (en) | 2004-07-23 | 2004-07-23 | Contactless on-load automatic regulating distribution transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1725618A true CN1725618A (en) | 2006-01-25 |
| CN100511947C CN100511947C (en) | 2009-07-08 |
Family
ID=35924895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410043740XA Expired - Fee Related CN100511947C (en) | 2004-07-23 | 2004-07-23 | Contactless on-load automatic regulating distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100511947C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579070A (en) * | 2014-12-31 | 2015-04-29 | 东北农业大学 | Automatic voltage control distribution transformer with contactless on-load and method for carrying out automatic voltage control |
| CN105632727A (en) * | 2014-11-25 | 2016-06-01 | 王海 | On-load tap-changer of transformer and on-load tap changing transformer |
| CN106100356A (en) * | 2016-08-18 | 2016-11-09 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer on-load voltage regulation system based on reverse parallel connection IGCT |
| CN103840729B (en) * | 2014-03-21 | 2017-03-01 | 东北农业大学 | The startup of contactless on-load automatic regulating distribution transformer and transition branch road |
| CN107846163A (en) * | 2017-11-07 | 2018-03-27 | 国网江苏省电力公司盐城供电公司 | A kind of contactless loaded automatic voltage-regulating system with current-limiting resistance |
| CN109087779A (en) * | 2018-07-18 | 2018-12-25 | 浙江纪元电气科技股份有限公司 | A kind of permanent magnetism on-load tap changer equipment of transformer |
-
2004
- 2004-07-23 CN CNB200410043740XA patent/CN100511947C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840729B (en) * | 2014-03-21 | 2017-03-01 | 东北农业大学 | The startup of contactless on-load automatic regulating distribution transformer and transition branch road |
| CN105632727A (en) * | 2014-11-25 | 2016-06-01 | 王海 | On-load tap-changer of transformer and on-load tap changing transformer |
| CN105632727B (en) * | 2014-11-25 | 2021-01-12 | 王海 | Transformer on-load voltage regulation tap switch and on-load voltage regulation transformer |
| CN104579070A (en) * | 2014-12-31 | 2015-04-29 | 东北农业大学 | Automatic voltage control distribution transformer with contactless on-load and method for carrying out automatic voltage control |
| CN104579070B (en) * | 2014-12-31 | 2018-08-17 | 东北农业大学 | Contactless on-load automatic regulating distribution transformer and the method for carrying out automatic Regulation |
| CN106100356A (en) * | 2016-08-18 | 2016-11-09 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer on-load voltage regulation system based on reverse parallel connection IGCT |
| CN107846163A (en) * | 2017-11-07 | 2018-03-27 | 国网江苏省电力公司盐城供电公司 | A kind of contactless loaded automatic voltage-regulating system with current-limiting resistance |
| CN109087779A (en) * | 2018-07-18 | 2018-12-25 | 浙江纪元电气科技股份有限公司 | A kind of permanent magnetism on-load tap changer equipment of transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100511947C (en) | 2009-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105515065A (en) | Wide range input self adjusting power transmission line induction power taking device | |
| CN101494374B (en) | Current protection control method for vacuum circuit breaker | |
| CN105429475A (en) | Combined single-phase/three-phase alternating current voltage stabilizer based on digital circuit control | |
| CN100511947C (en) | Contactless on-load automatic regulating distribution transformer | |
| CN206922435U (en) | A kind of novel intelligent reactive compensation apparatus | |
| CN203536971U (en) | Series connection compensation device for intelligent distribution network | |
| CN205646962U (en) | Alternating current -direct current conversion charging circuit | |
| CN101351069B (en) | Illumination energy-saving apparatus for primary contactless voltage-regulating of transformer | |
| CN101471556B (en) | Under-voltage protection circuit | |
| CN205622245U (en) | High reliability transmission line responds to draw -out power supply | |
| CN202282754U (en) | High-voltage motor soft starting device implemented by finished low-voltage motor soft starter | |
| CN201393070Y (en) | Low-voltage reactive-power comprehensive compensation device | |
| CN206878464U (en) | A kind of distribution transformer split-phase voltage-regulating system | |
| CN1728492A (en) | Protector for imbalance of three-phase voltage | |
| CN205595800U (en) | Have electric energy quality regulation function's energy -saving low -voltage reactive power compensator concurrently | |
| CN2859899Y (en) | Solar energy auto-compensating electronic controls | |
| CN86103005A (en) | A kind of by capacitor energy storage direct current power source supplying power device | |
| CN2802829Y (en) | Electronic balance compensation electric saver | |
| CN1072294A (en) | Multi-function automatic monitor for power consumption | |
| CN201667556U (en) | Automatic power supply self-service charging machine | |
| CN2296014Y (en) | Multifunctional A.C. wattmeter | |
| CN205195549U (en) | High -voltage inverter's preliminary filling electronic control system | |
| CN1028336C (en) | Charge device of battery and charging control method | |
| CN2430806Y (en) | Intelligent phase control DC power device for transforming station | |
| CN203205877U (en) | Reactive power compensator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20120723 |