CN2202994Y - Electricity transmission three-phase automatic balancing device - Google Patents
Electricity transmission three-phase automatic balancing device Download PDFInfo
- Publication number
- CN2202994Y CN2202994Y CN 94204624 CN94204624U CN2202994Y CN 2202994 Y CN2202994 Y CN 2202994Y CN 94204624 CN94204624 CN 94204624 CN 94204624 U CN94204624 U CN 94204624U CN 2202994 Y CN2202994 Y CN 2202994Y
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- phase
- contactor
- circuit
- direct current
- auxiliary contact
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Abstract
The utility model discloses an electricity transmission three phase automatic balancing device, which is a three phase load automatic balancing device in an electricity transmission network. High power single phase load such as single phase line frequency furnace, etc. can be directly connected in the electricity transmission network and the required three phase unbalance DEG by the electricity transmission network can be maintained. The utility model is composed of an electric voltage sampling circuit, an analogue to digital converter circuit, an interface circuit, a microcomputer TP-801 circuit, a PIO output circuit, an amplifying circuit, a contactor control circuit, a single phase load circuit, etc. The utility model is characterized in that the main contacts of every four single phase AC contactors are connected in series together by a main circuit, and then the front end and the back end of the main circuit are connected with the two phases of the three phases of electricity transmission network. Three connection points are arranged among the four serial main contacts, wherein, a center connection point is connected with the third phase of the electricity transmission network, and the rest two connection points are connected with the single phase load circuit.
Description
The utility model is after a kind of single-phase load inserts the three-phase power transmission net, keeps the power transmission network three-phase autobalance that the power transmission network three-phase current is no more than the degree of unbalance requirement of regulation.
High-power single-phase electric equipment products, as single-phase loads such as line frequency furnaces is to destroy the principal element of grid balance, at present, the method that solves is to add electric power capacitor, reactor etc. with power transformer, constitute three-phase/single-phase covert power supply, become single-phase load into the three-phase equilibrium load, hang into electrical network with the three-phase form.Concrete grammar has: (1) is configured in two-phase beyond the single-phase load (domestic most electric furnace factory continue to use) respectively with reactor, capacitor.(2) adopt the three-phase equilibrium device of forming by interphase reactor, phase shifting capacitor (" electric furnace " 1989 the 3rd phases, Meiling Hill virtue, two-phase line frequency furnace).(3) the SDT three-phase/single-phase conversion equipment of forming by balance, pressure regulation, adjustment, demonstration four parts of Qingdao electric furnace factory development.(4) Jinzhou four reaches the development of electric heating Study on Engineering Design institute, and the three-phase/two-phase transformer that connects winding with SCOTT adds the industrial-frequency phase transformer that the electric power capacitor is formed.(5) generally adopt high usage three phase mains transformer to add three-phase equilibrium device (" electric furnace " 1988 the 6th phases, yellow coin algae, the progress of the external power frequency cored induction melting furnace of used for non-ferrous metal) abroad.The weak point of above-mentioned several devices is, (1) except that transformer, also added power capacitor, the reactor (industrial-frequency phase transformer has saved reactor) that adapts with high-power single-phase load in this covert power supply, every load need be joined this power supply, cost height.(2) this covert power supply can only solve the imbalance of single-phase load self, can not improve grid balance.
The utility model its objective is provides a kind of power transmission network three-phase automatic balancing arrangement, makes high-power single-phase load directly hang power transmission network, and can keep the tri-phase unbalance factor of power transmission network requirement.
The technical scheme that realizes above-mentioned purpose and adopt is, by connecting single-phase load (R
1R
m) main circuit and the control circuit of control main circuit action form.Main circuit is with per four single phase alternating current (A.C.) main noddle on contactor JC
2, JC
4, JC
3, JC
1Be together in series successively, the two-phase in the head and the tail two termination three-phase power transmission nets has three tie points between four A.C. contactor main contacts of series connection, and its central tie point connects the third phase of three-phase power transmission net, and two remaining tie points meet a single-phase load (R
1).Control circuit comprises sample circuit, A/D converter, interface circuit, single board computer, amplifying circuit, direct current relay and ac contactor control circuit.Sample circuit input termination three-phase power transmission net, output connects A/D converter ADC0809, and A/D converter ADC0809 connects single board computer TP801 through interface circuit, and the PIO mouth of single board computer TP801 connects amplifying circuit.Amplifying circuit output connects the direct current relay coil, and the direct current relay contact connects ac contactor control circuit.
The utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is a schematic diagram.
Fig. 2 is a main circuit diagram.
Fig. 3 is sampling, data processing and control circuit diagram.
Fig. 4 is an amplification circuit diagram.
Fig. 5 is ac contactor control circuit figure.
Fig. 6 is Electric Appliance Cabinet figure.
The utility model can be controlled one to tens of high-power single-phase load (R
1～R
m), earlier to control a single-phase load R
1For example is narrated its operation principle.
Single-phase load R
1Adopt " four 5 connections of switch " to insert on the power transmission network of main circuit, as shown in Figure 2, its switch motion is realized by control circuit according to the variation of power transmission network three-phase voltage, shown in Fig. 3,4,5.
Sample circuit is at first gathered three resistance r of reflection power transmission network A, B, C three-phase voltage
1～r
3On magnitude of voltage, as shown in Figure 3, it comprises three-phase transformer TB, diode D
1～D
3With resistance r
1～r
3, the elementary three-phase power transmission net that connects of three-phase transformer TB, secondary three-phase meets diode D respectively
1, D
2, D
3Anode, negative electrode is connecting resistance r respectively
1, r
2, r
3, resistance r
1～r
3The other end is linked to be any and connects three-phase transformer TB level initial point and ground connection, and sample circuit is through diode D
1, D
2, D
3Negative electrode and resistance r
1, r
2, r
3Tie point output connects the 26th, 27, the 28 pin analog signal input pins of A/D converter ADC0809 respectively.
A/D converter ADC0809 the 11st, the 12 pin DC power supply (+5 volts) that is connected, the 13rd, the 16 pin ground connection that links to each other, the 21st, 20,19,18,8,15,14,17 pin meet the 13rd of single board computer TP801 respectively, 10,9,7,8,12,15,14 pin, interface circuit makes A/D converter ADC0809 the 17th pin link to each other with 25 pin simultaneously, 14 pin link to each other with 24 pin, 15 pin link to each other with 23 pin, the 7th pin connects single board computer TP801 the 16th pin through not gate 74LS04, single board computer TP801 the 6th pin meets A/D converter ADC0809 the 10th pin, single board computer TP801 the 21st through frequency divider 74LS74,20,22 pin and I/O decoder output line PS
6(Y
6) meeting NOR gate 74LS02, NOR gate 74L,S02 two outputs connect A/D converter ADC0809 the 9th pin and the 6th, 22 pin respectively, and single board computer TP801 is through the A of PIO mouth, the output of B mouth.
A, B, C three-phase voltage are reflected to TB level of three-phase transformer on the power transmission network, because it is connected with diode D
1～D
3, resistance r
1～r
3, at resistance r
1, r
2, r
3On obtain≤5 volts d. c. voltage signal, this signal output causes A/D converter ADC0809, convert digital signal to through the 21st, 20,19,18,8,15,14,17 pin output binary system eight-digit number word, give single board computer TP801, after microprocessor is handled by table one requirement, by the PA of PIO
0, PA
1, PA
2, PA
3And PB
0, PB
1, PB
2, PB
3Output in the amplifying circuit.
Amplifying circuit as shown in Figure 4, the A mouth of PIO output PA
0～PA
3Each bar amplifying circuit graph structure is identical, with PA
0Be example: PA
0Connect diode D
4Anode, negative electrode series resistance R connects triode V
1, V
2One the tunnel connect the direct current relay coil after collector electrode linked to each other, and another road meets diode D
5Negative electrode with connect DC power supply (+24 volts) after another leading-out terminal of direct current relay coil links to each other.
The A mouth output of PIO is control direct current relay J after amplifying circuit amplifies
1～J
4Action.For example, suppose PA
0Be " 1 " diode D then
4Conducting is added to triode V through after the resistance R
1Base stage, triode V
1Conducting, triode V simultaneously
2Also conducting, like this, at triode V
1, V
2The common collector end obtains low level, diode D
5End, make that+24 volts of direct voltages are added in direct current relay J
1On the coil, direct current relay J
1Action makes its normally opened contact closure, the ac contactor control circuit action of control back.
Ac contactor control circuit as shown in Figure 5, single-phase load R
1Ac contactor control circuit by A.C. contactor JC
1～JC
4With direct current relay J
1～J
4The contact connects to form, Fen Silu, and one the tunnel is direct current relay J
4Normally opened contact and A.C. contactor JC
2And JC
3Connect A.C. contactor JC again after the normally closed auxiliary contact series connection
4Coil, the two tunnel is direct current relay J
1Normally opened contact and A.C. contactor JC
3Normally closed auxiliary contact series connection connects A.C. contactor JC again
1Coil, the three tunnel is direct current relay J
2Normally opened contact and A.C. contactor JC
4Normally closed auxiliary contact series connection connects A.C. contactor JC again
2Coil, the four tunnel is direct current relay J
3Normally opened contact and A.C. contactor JC
1And JC
4Connect A.C. contactor JC again after the normally closed auxiliary contact series connection
3Coil, simultaneously, A.C. contactor JC
4Often open auxiliary contact, JC
3Normally closed auxiliary contact, JC
2Often open auxiliary contact, JC
3Often open auxiliary contact and connect successively, head end JC
4Often open auxiliary contact and be connected one tunnel JC
3Normally closed auxiliary contact and JC
4Between the coil, JC
4Often open the auxiliary contact other end and two tunnel direct current relay J
1Normally opened contact and JC
3Normally closed auxiliary contact common port connects; Terminal JC
3Often open auxiliary contact and be connected four tunnel direct current relay J
3Normally opened contact and JC
1Between the normally closed auxiliary contact, JC
3Often open the auxiliary contact other end and three tunnel direct current relay J
2Normally opened contact and JC
4Normally closed auxiliary contact common port connects, last direct current relay J
1～J
4The contact other end links together, A.C. contactor JC
1～JC
4The coil other end also links together, difference tandem tap HZ after promptly above-mentioned four tunnel parallel connections
1In any two-phase that is connected on behind the fuse 2RD in the main circuit three-phase power transmission net.
Like this, under the effect of ac contactor control circuit, the A.C. contactor JC in the main circuit
1～JC
4The main contact action, single-phase load R
1Hang the high two-phase of voltage in the three-phase power transmission net, thereby this two phase voltage is reduced immediately, thereby reduce the Voltage unbalance degree.
Table one is this device working condition, "+" expression direct current relay J contact and A.C. contactor JC main contact closure in the table, and the space is represented to disconnect, and for example, sequence number 1 is as power transmission network phase voltage V
AV
BV
C, under system controlled by computer, direct current relay J
1, J
2The normally opened contact closure, A.C. contactor JC
1, JC
2It is also closed often to open main contact, single-phase load R
1Hang lambda line voltage V
ABThe variation of power transmission network phase voltage, can change mutually automatically between the sequence number 0～12, but when the voltage that is no more than regulation or current imbalance are spent, then keep present situation, will not change.
More than be single-phase load R of control
1Situation.The A of each interface chip PIO, B respectively control a load for two mouthfuls, three PIO control six loads altogether, if need further expand single board computer TP801 function, can add an I/O decoder 74LS138, and be equipped with eight PIO, then can control 16 loads, other circuit is the same when loading with one of control more.
This installs used components and parts tabulation two, the required accessory tabulation three of load of every control, and each that controlled waited the used components and parts capacity of 380V single-phase load of level capacity, and variation person tabulates four with load.
Table two, table three be electric elements all, remove TP-801, HZ
1Be loaded on outside the Electric Appliance Cabinet cabinet face, other is all packed in the cabinet.
Voltage unbalance is caused by current imbalance, and three-phase current unbalance degree δ i formula is:
δi≤1.73△P／P＝1.73（0.4～1）P
0／（nP
0）
In the formula: P
0-separate unit load capacity
The n-positive rational number
P-power transmission network (forming) capacity by the 380V three-phase transformer
△ P-three-phase power imbalance value (two-phase difference power maximum)
The separate unit performance number excursion of electric furnace is 0.4～1, by the control of this device, the several 1～m platform of electric furnace (m=2,3 ...) its △ P is not quite similar, and for example to 6,9 electric furnaces, all △ P can be controlled at 0.6P
0Below, they operate on the different capabilities electrical network, can obtain different current imbalance degree δ i.
1, P
0=100KW, 9
1) the P=1250KVA(1250KVA transformer is 1)
δ i≤8.35%(national standard 8%)
2) P=1750KVA(transformer 1250KVA, each 1 of 500KVA is incorporated into the power networks)
δi≤6％
2, P
0=320KW, 6
1) 2 in P=2500KVA(1250kVA transformer is incorporated into the power networks)
δ i≤13.36%(the standard laid down by the ministries or commissions of the Central Government 20%)
2) P=5630KVA(transformer 1250KVA4 platform, the 630KVA1 platform is incorporated into the power networks)
δi≤6％
Has only the 380V grid balance, then its high-voltage fence of getting in touch could balance, the actual most electricity consumers of China's regulation power network current degree of unbalance≤8%(substantially exceed this standard at present), international standard≤5% is far apart, if but adopt the control of this device, and the 380V electrical network taked to be incorporated into the power networks, then can meet or exceed world level, China's grid supply quality is greatly improved.
Control examples, table five provide nF-△ P
1, utilize single-phase load to reduce power transmission network three-phase current unbalance degree.
Example 1 has a 380V, 1000KVA three-phase power transmission net, records its three-phase current I
AI
B=I
C, and three-phase current unbalance degree δ i
0=25%, it is 1 on the molten aluminium electric furnace of GWL1-0.75-200 that there are 380V, 200KW model the present, intends operating on this electrical network, and the control with by power transmission network three-phase autobalance drops to δ i with power transmission network three-phase current unbalance degree.
(1) calculates δ i
δi
0＝1.73△P／P
△ P=P δ i
0/ 1.73=1000 * 0.25/1.73=143.7KW(power transmission network three-phase power imbalance value)
Furnace power changes from 40%～100%,
40％：δi＝1.73×（143.7－200×0.4）／1000＝11.1％
100％：δi＝1.73×（200－143.7）／1000＝9.8％
71.85％：δi＝1.73×（200－0.7185－143.7）／1000≈0
So: δ i=0～11.1%
By the control of this device, make power transmission network three-phase current unbalance degree drop to 0～11.1% by 25%.
(2) import in this device Control Program for Microcomputers [Digital Research] by δ i=11.1%, can guarantee δ i=11.1%, avoided 0～11.1% frequent adjustment simultaneously.
(3) connect heating cord by Fig. 2.
(4) the unit switch HZ that closes
1
2, the degree of unbalance of the special-purpose power transmission network of control single-phase load group
It is 22 of the single-phase copper-melting electric furnaces of GYT-0.3-50-1 that example 2,380V, 1500KVA three-phase power transmission net are powered to 380V, 50KW model, by power transmission network three-phase autobalance control three-phase current unbalance degree δ i.
(1) calculates δ i
Table look-up five, nF-△ P table, nF=3K+1(K=7), △ P=P.
δi≤1.73△P／P＝1.73×50／1500＝5.8％
(2) with in the δ i=5.8% input control program
(3), (4) are with example 1.
It is 12 in the single-phase molten copper stove of GYT-0.3-80-1 that example 3,380V, 1250KVA three-phase power transmission net are powered to 380V, 80KW model, by power transmission network three-phase autobalance control three-phase current unbalance degree δ i.
(1) calculates δ i
Table look-up five, nF-△ P table, nF=3K(K=4), △ P=0.6P
0
δi≤1.73△P／P＝1.73×0.6×80／1250＝6.7％
(2) with in the δ i=6.7% input control program
(3), (4) are with example 1.
Compared with prior art, the utility model has following advantage:
1, owing to founded " four 5 connections of switch ", single-phase load is directly hung three phase network, thereby the covert power supply that saved every load has correspondingly saved power capacitor, reactor (both capacity all be single-phase load capacity 57.70%) and cooling device thereof.
2, because single-phase load directly hangs three phase network, to the pressure regulation claimer is arranged, only need with single-phase voltage regulating device (capacity=voltage * electric current), with compare with three-phase regulator (capacity=1.73 voltages * electric current), save transformer capacity 73%(1.73:1=1.73), correspondingly save supply of electrical energy 73%.
3, owing to adopt system controlled by computer, load of every increase only needs to press table three increase by one cover accessory, and load platform number the more economic benefit is higher, thereby has eliminated the relation that the platform number of loading is directly proportional with investment.
4, owing to adopt system controlled by computer, make single-phase load stride into high line voltage by low line voltage at any time, do not destroy grid balance so not only guaranteed single-phase load, and can reduce the original imbalance of electrical network.
5, because net capacity (P) is bigger, then three-phase power imbalance value (being two-phase difference power maximum △ P) is littler, this device is to control electrical network three-phase current unbalance degree (δ i) by δ i≤1.73 △ P/P, and δ i is inversely proportional to P, so in essence, this device is to utilize the stability of electrical network self to solve the equilibrium problem of electrical network, thereby reaches the purpose that high benefit ground reduces electrical network three-phase current unbalance degree (δ i).
Table one:
| Preface | Electrical network phase voltage V (Fig. 1) | Direct current relay J contact A.C. contactor JC contact | Load R 1Stride into line voltage V (Fig. 1) | |||
| 1 | 2 | 3 | 4 | |||
| 0 | A=B=C | + | + | CA | ||
| 1 | A＞B＞C | + | + | AB | ||
| 2 | B＞A＞C | + | + | |||
| 3 | A=B＞C | + | + | |||
| 4 | B＞A=C | + | + | |||
| 5 | B＞C＞A | + | + | BC | ||
| 6 | C＞B＞A | + | + | |||
| 7 | B=C＞A | + | + | |||
| 8 | C＞B=A | + | + | |||
| 9 | C＞A＞B | + | + | CA | ||
| 10 | A＞C＞B | + | + | |||
| 11 | C=A＞B | + | + | |||
| 12 | A＞C=A | + | + | |||
Table two:
| Symbol | Title and model | Quantity | Symbol | Title and model | Quantity | |
| TB | Three-phase transformer 5VA, 380/10V | 1 | TP801 | Single board computer TP-801 | 1 | |
| r 1～r 3 | Metalfilmresistor 100 ± 1%, 1/4W | 3 | D 1～D 3 | Diode 2CP41 | 3 | |
| ADC0809 | A/D converter ADC0809 | 1 | | Fuse | 3 | |
| 74LS04 | Not gate 74LS04 | 1 | | Fuse | 2 | |
| 74LS02 | NOR gate 74LS02 | 1 | HZ 1 | Unit switch HZ10-10/2 | 1 | |
| 74LS74 | Frequency divider 74LS74 | 1 |
Table three
| Symbol | Title and symbol | Quantity | Symbol | Title and model | Quantity |
| D 1～D 3 | Diode 2AP23 | 7 | J 1～J 4 | Direct current relay JTX-1 24V | 4 |
| V 1 | Triode 3DG6D | 4 | R | Metalfilmresistor 5.1K 1/16W | 4 |
| V 2 | Triode 3DG12B | 4 | JC 1～JC 4 | 380V single phase alternating current (A.C.) contactor | 4 |
Table four:
| Load (KW) | 380V single phase alternating current (A.C.) contactor (A) | Load (KW) | 380V single phase alternating current (A.C.) contactor (A) |
| 40 | 100 | 320 | 800 |
| 100 | 300 | 450 | 1200 |
Table five:
| nF | 3K | 3K±1 |
| △P | 0.6P 0 | P 0 |
In the table: nF-load platform number
K-COEFFICIENT K=0,1,2
P
0-separate unit load capacity
Claims (2)
1, a kind of power transmission network three-phase autobalance is by connecting single-phase load (R
1... R
m) main circuit and the control circuit of control main circuit action form; It is characterized in that main circuit is with per four single phase alternating current (A.C.) main noddle on contactor JC
2, JC
4, JC
3, JC
1Be together in series successively, the two-phase in the head and the tail two termination three-phase power transmission nets has three tie points between per four A.C. contactors of series connection, and its central tie point connects the third phase of three-phase power transmission net, and two remaining tie points meet a single-phase load (R
1), control circuit comprises sample circuit, A/D converter, interface circuit, single board computer, amplifying circuit, direct current relay and ac contactor control circuit, sample circuit input termination three-phase power transmission net, output connects A/D converter ADC809, A/D converter ADC0809 connects single board computer TP801 through interface circuit, the PI0 mouth of single board computer TP801 connects amplifying circuit, and amplifying circuit output connects the direct current relay coil, and the direct current relay contact connects ac contactor control circuit.
2, power transmission network three-phase autobalance according to claim 1 is characterized in that single-phase load R
1Ac contactor control circuit by A.C. contactor JC
1～JC
4With direct current relay J
1～J
4The contact connects to form, Fen Silu, and one the tunnel is direct current relay J
4Normally opened contact and A.C. contactor JC
2And JC
3Connect A.C. contactor JC again after the normally closed auxiliary contact series connection
4Coil, the two tunnel is direct current relay J
1Normally opened contact and A.C. contactor JC
3Normally closed auxiliary contact series connection connects A.C. contactor JC again
1Coil, the three tunnel is direct current relay J
2Normally opened contact and A.C. contactor JC
4Normally closed auxiliary contact series connection connects A.C. contactor JC again
2Coil, the four tunnel is direct current relay J
3Normally opened contact and A.C. contactor JC
1And JC
4Connect A.C. contactor JC again after the normally closed auxiliary contact series connection
3Coil, simultaneously, A.C. contactor JC
4Often open auxiliary contact, JC
3Normally closed auxiliary contact JC
2Often open auxiliary contact, JC
3Often open auxiliary contact and connect successively, head end JC
4Often open auxiliary contact and be connected one tunnel JC
3Normally closed auxiliary contact and JC
4Between the coil, JC
4Often open auxiliary contact, the other end and two tunnel direct current relay J
1Normally opened contact and JC
3Normally closed auxiliary contact common port connects; Terminal JC
3Often open auxiliary contact and be connected four tunnel direct current relay J
3Normally opened contact and JC
1Between the normally closed auxiliary contact, JC
3Often open the auxiliary contact other end and three tunnel direct current relay J
2Normally opened contact and JC
4Normally closed auxiliary contact common port connects, last direct current relay J
1～J
4The contact other end links together, A.C. contactor JC
1～JC
4The coil other end links together, difference tandem tap HZ after promptly above-mentioned four tunnel parallel connections
1In any two-phase that is connected on behind the fuse 2RD in the main circuit three-phase power transmission net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94204624 CN2202994Y (en) | 1993-02-15 | 1994-02-09 | Electricity transmission three-phase automatic balancing device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93203589 | 1993-02-15 | ||
| CN93203589.2 | 1993-02-15 | ||
| CN 94204624 CN2202994Y (en) | 1993-02-15 | 1994-02-09 | Electricity transmission three-phase automatic balancing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2202994Y true CN2202994Y (en) | 1995-07-05 |
Family
ID=34065294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94204624 Expired - Fee Related CN2202994Y (en) | 1993-02-15 | 1994-02-09 | Electricity transmission three-phase automatic balancing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2202994Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487197A (en) * | 2010-12-01 | 2012-06-06 | 广东西电动力科技股份有限公司 | Three-phase load balancer of small-power set |
| CN101694969B (en) * | 2009-10-22 | 2013-10-23 | 卧龙电气集团股份有限公司 | Variable-frequency speed control input voltage conversion device and method thereof |
-
1994
- 1994-02-09 CN CN 94204624 patent/CN2202994Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694969B (en) * | 2009-10-22 | 2013-10-23 | 卧龙电气集团股份有限公司 | Variable-frequency speed control input voltage conversion device and method thereof |
| CN102487197A (en) * | 2010-12-01 | 2012-06-06 | 广东西电动力科技股份有限公司 | Three-phase load balancer of small-power set |
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