CN219041657U - Excitation dual-power supply circuit - Google Patents

Abstract

The utility model discloses an excitation dual-power supply circuit which mainly comprises two modules, namely a control module and a power supply module, wherein the control module mainly comprises an excitation signal control loop, and the power supply module mainly comprises a rectification and power supply loop of a direct-current power supply and an alternating-current power supply. The system adopts an alternating current excitation mode by default in working, can select direct current excitation, can reduce loss and enhance system stability when encountering power failure, vibration and other conditions of a power grid, and provides guarantee for excitation of a generator, so that the generator can be excited rapidly, safely and stably.

Description

Excitation dual-power supply circuit

Technical Field

The utility model relates to the technical field of generator excitation, in particular to an excitation dual-power supply circuit which is composed of a direct-current power supply, an alternating-current power supply, a contactor, a rectifier, a circuit breaker, a transformer, a resistor, a diode and other elements.

Background

The power supply for supplying the exciting current to the generator and its accessories are collectively referred to as an excitation system. The excitation type excitation system can be divided into a self-excitation system and a separate excitation system according to an excitation mode. The generator using the self-excitation system generally has the characteristics of strong stability, high response speed to upstream instructions, high safety, low running cost and the like, but the problem of excitation starting of the generator still exists to be solved. The excitation of the generator is a necessary process for generating electricity by the generator, and the generator can generate electricity more stably by rapid, stable and safe excitation.

The excitation mode of the self-excitation system of the generator is generally divided into direct current excitation and alternating current excitation, when alternating current excitation is adopted, the purpose of excitation can be achieved by using fewer excitation power sources, so that when engineering design is carried out, single alternating current excitation is mainly adopted, but because the power grid can have power failure, vibration and other conditions, the excitation system is also provided with other excitation modes for reducing loss and enhancing the stability of the system, and a novel excitation system excitation power supply circuit with double power sources is required to be provided.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide the excitation dual-power supply circuit aiming at the defects of the prior art, a new solution is provided for excitation of the generator excitation system, and the excitation stability, rapidity and safety are improved.

In order to achieve the above purpose, the specific technical scheme of the excitation dual-power supply circuit of the utility model is as follows:

the utility model provides an excitation dual supply power supply circuit, includes control module and power module, and control module includes excitation signal control circuit, and power module includes direct current power supply circuit and alternating current power supply circuit.

The excitation signal control loop circuit comprises a contactor and a diode, and is specifically connected in the following manner: in the circuit from the terminal A to the terminal B, the terminal A is connected with the interface A, the interface A and the interface B receive alternating current excitation signals, the interface B is connected with a coil of the contactor A, meanwhile, a diode A is connected with the contactor A in parallel, one end of the diode A is a cathode, and the other end of the diode A is an anode; in the circuit from the terminal C to the terminal D, the terminal C is sequentially connected with four contacts of the contactor A and then connected with the contactor B, and meanwhile, one end of the diode B is used as a cathode, and the other end of the diode B is connected in parallel with the contactor B; the terminal E is connected with the terminal F in a circuit, the terminal E is connected with the interface C, the interface C and the interface D receive direct current excitation signals, the interface D is connected with a coil of the contactor C, the diode C is connected with the interface C in parallel, the parallel connection mode is the same as the above, simultaneously, four contacts of the contactor C are sequentially connected, one contact of the contactor C is connected with the coil of the contactor D, the diode D is connected with the coil of the contactor D in parallel in the same mode, and the diode C is connected to the port E and the terminal F in parallel.

The excitation dual-power supply circuit comprises a control module and a power supply module, wherein the control module comprises an excitation signal control loop, and the power supply module comprises a direct current power supply loop and an alternating current power supply loop;

an interface A and an interface B for receiving an alternating current excitation signal are arranged in a line from a terminal A to a terminal B of the excitation signal control loop, wherein the interface A is connected with the terminal A, the interface B is connected with a coil of a contactor A, the contactor A and a diode A are connected in parallel by taking a first end point of the diode as a cathode, and a second end point of the diode as an anode;

in a circuit from a terminal C to a terminal D of the excitation signal control loop, the terminal C is sequentially connected with a first contact, a second contact, a third contact and a fourth contact of a contactor A, the fourth contact is connected with a contactor B, the contactor B and a diode B take a diode endpoint I as a cathode, and a diode endpoint II as an anode, and the contactor B and the diode endpoint II are connected in parallel;

an interface C and an interface D for receiving a direct current excitation signal are arranged in a line from a terminal E to a terminal F of the excitation signal control loop, wherein the interface C is connected with the terminal E, the interface D is connected with a coil of a contactor C, the contactor C and a diode C are connected in parallel by taking a terminal A of the diode as a cathode, and a terminal B of the diode as an anode.

The specific connection mode of the direct current power supply loop in the power supply loop is as follows: the negative electrode of the direct current power supply is connected with two contacts of the breaker A, then connected with the resistor A, connected with the rectifier A, connected with two contacts of the contactor D after passing through the rectifier A, and finally output; the positive pole of the direct current power supply is connected with the other two contacts of the breaker A, then connected with the rectifier B, connected with the other two contacts of the contactor D after passing through the rectifier B, and finally output; the specific connection mode of the alternating current power supply loop is as follows: A. b, C are respectively connected with the fuse, and are connected with six contacts of the contactor A after connection, and simultaneously, six other contacts are connected with the fuse in parallel, are connected with A, B, C three phases of the transformer, are connected with the rectifier C after passing through the transformer, are connected with the rectifier C after rectification, are connected with two contacts of the contactor B for output, are connected with two contacts of the breaker B again after connection of the negative electrode, are connected with the other two contacts of the contactor B in the same way, and are connected with the other two contacts of the breaker B after output. Meanwhile, a resistor B is connected between the positive electrode and the negative electrode of the rectifier C after rectification, and a resistor C is connected between a contact beta and a contact delta of the circuit breaker B.

Compared with the prior art, the utility model has the beneficial effects that:

aiming at the excitation starting problem of the generator excitation system, the excitation dual-power supply circuit provides a novel solution, adopts an alternating current excitation starting mode by default in working, can also select direct current excitation starting, can reduce loss and enhance system stability when encountering the conditions of power failure, vibration and the like of a power grid, and provides guarantee for generator excitation, so that excitation can be rapidly, safely and stably started.

Drawings

FIG. 1 is a schematic diagram of a circuit module according to the present utility model;

FIG. 2 is a schematic diagram of an excitation signal control loop according to the present utility model;

FIG. 3 shows a DC power supply loop and an AC power supply loop according to the present utility model;

the figure indicates:

1. a terminal A;

2. an interface A;

3. an interface B;

4. a contactor A; 401. a first contact; 402. a second contact; 403. a third contact; 404. a fourth contact; 405. a fifth contact; 406. a sixth contact; 407. a seventh contact; 408. an eighth contact; 409. a ninth contact; 410. a tenth contact; 411. an eleventh contact; 412. a twelfth contact; 413. a thirteenth contact; 414. a fourteenth contact; 415. a fifteenth contact; 416. a sixteenth contact;

5. a diode A; 501. a diode first terminal; 502. a diode second terminal;

6. a terminal B;

7. a terminal C;

8. a contactor B; 801. a first contact; 802. a second contact; 803. a third contact; 804. a contact fourth;

9. a diode B; 901. diode terminal I; 902. diode terminal two;

10. a terminal D;

11. a terminal E;

12. an interface C;

13. an interface D;

14. a contactor C; 1401. a nail contact; 1402. a second contact; 1403. a C contact; 1404. ding Chudian;

15. a diode C; 1501. a diode a terminal; 1502. a second end point of the diode;

16. a terminal F;

17. a contactor D; 1701. a contact I; 1702. a contact II; 1703. a contact III; 1704. a contact IV;

18. a diode D; 1801. a diode I-th terminal; 1802. a diode II terminal;

19. a circuit breaker A; 1901. an I-th contact; 1902. a second contact; 1903. a III-th contact; 1904. IV contact;

20. a resistor A;

21. a rectifier A;

22. a rectifier B;

23. a fuse;

24. a transformer;

25. a rectifier C;

26. a resistor B;

27. a circuit breaker B; 2701. a contact alpha; 2702. a contact beta; 2703. a contact gamma; 2704. a contact delta;

28. and a resistor C.

Detailed Description

For a better understanding of the objects, structures and functions of the present utility model, a field double-power supply circuit of the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.

Example 1:

referring to fig. 1-3, the present utility model provides a technical solution: the excitation dual-power supply circuit comprises a control module and a power supply module, wherein the control module comprises an excitation signal control loop, and the power supply module comprises a direct-current power supply loop and an alternating-current power supply loop;

an interface A2 and an interface B3 for receiving an alternating current excitation signal are arranged in a line from a terminal A1 to a terminal B6 of the excitation signal control loop, wherein the interface A2 is connected with the terminal A1, the interface B3 is connected with a coil of a contactor A4, the contactor A4 and a diode A5 are connected in parallel by taking a diode first end point 501 as a cathode, and a diode second end point 502 as an anode;

in the circuit from the terminal C7 to the terminal D10 of the excitation signal control circuit, the terminal C7 is sequentially connected with the first contact 401, the second contact 402, the third contact 403 and the fourth contact 404 of the contactor A4, the fourth contact 404 is connected with the contactor B8, the contactor B8 and the diode B9 are connected in parallel with the diode terminal one 901 as a cathode and the diode terminal two 902 as an anode;

an interface C12 and an interface D13 for receiving a direct current excitation signal are arranged in a line from a terminal E11 to a terminal F16 of the excitation signal control circuit, wherein the interface C12 is connected with the terminal E11, the interface D13 is connected with a coil of a contactor C14, the contactor C14 and a diode C15 are connected in parallel by taking a diode first terminal 1501 as a cathode, and a diode second terminal 1502 as an anode.

Further, the terminal E11 is sequentially connected to the a contact 1401, the b contact 1402, the C contact 1403, and the Ding Chudian contact 1404 of the contactor C14, the Ding Chudian contact 1404 is connected to the coil of the contactor D17, the contactor D17 is connected in parallel with the diode D18 by using the diode I-th terminal 1801 as a cathode and the diode II-th terminal 1802 as an anode, and the contactor D17 is connected to the terminal F16.

Further, in the dc power supply circuit, the negative electrode of the dc power supply is connected to the I-th contact 1901 and the II-th contact 1902 of the circuit breaker a19, the II-th contact 1902 is connected to the resistor a20, the resistor a20 is connected to the rectifier a21, and the rectifier a21 is connected to the contact I1701 and the contact II1702 of the contactor D17;

the positive pole of the direct current power supply in the direct current power supply loop is connected with a III-th contact 1903 and an IV-th contact 1904 of a circuit breaker A19, the IV-th contact 1904 is connected with a rectifier B22, and the rectifier B22 is connected with a contact III1703 and a contact IV1704 of a contactor D17.

Further, the resistor a20 is a current limiting resistor.

Further, in the ac power supply circuit, A, B, C three phases of the ac power supply are respectively connected to the fuse 23, the fuse 23 is respectively connected to the fifth contact 405 and the sixth contact 406, the seventh contact 407 and the eighth contact 408, the ninth contact 409 and the tenth contact 410 of the contactor A4, the fifth contact 405 and the sixth contact 406 are connected in parallel to the fifteenth contact 415 and the sixteenth contact 416, the seventh contact 407 and the eighth contact 408 are connected in parallel to the thirteenth contact 413 and the fourteenth contact 414, the ninth contact 409 and the tenth contact 410 are connected in parallel to the eleventh contact 411 and the twelfth contact 412, the fifth contact 405 and the sixth contact 406 of the contactor A4, the seventh contact 407 and the eighth contact 408, the ninth contact 409 and the tenth contact 410 are respectively connected to A, B, C three phases of the transformer 24, and the transformer 24 is connected to the rectifier C25.

Further, the negative pole of the rectifier C25 is connected to the first contact 801 and the second contact 802 of the contactor B8, and the second contact 802 is connected to the contacts α 2701 and β 2702 of the breaker B27;

the positive electrode of the rectifier C25 is connected to the third and fourth contacts 803 and 804 of the contactor B8, and the fourth contact 804 is connected to the third and fourth contacts γ 2703 and δ 2704 of the breaker B27.

Further, a resistor B26 is connected between the positive electrode and the negative electrode of the rectifier C25, and the resistor B26 is a current limiting resistor.

Further, a resistor C28 is connected between the contacts β2702 and δ2704 of the breaker B27.

Further, the resistor C28 is a current limiting resistor.

Working principle:

if the system adopts an alternating current excitation mode, the interface A2 and the interface B3 receive alternating current excitation signals, the contactor A4 wire package is powered, the contacts 401, 402, 403 and 404 of the contactor A4 on the lines from the terminal C7 to the terminal D10 are closed, and the contactor B8 wire package is powered. Meanwhile, in the ac power supply loop, current flows out from the three-phase ac power supply, passes through the fuse 23, contacts 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416 of the contactor A4 are closed due to the fact that the contactor A4 coil is powered on, passes through the contactor A4, enters the transformer 24 to be transformed to 20V, is input into the rectifier C25, is output after rectification, and then is finally output after the contacts 801, 802, 803, 804 of the contactor B8 coil are closed.

If the system adopts a direct current excitation mode, the interface C12 and the interface D13 receive direct current excitation signals, the contactor C14 coil is powered on, contacts 1401, 1402, 1403 and 1404 of the contactor C14 are closed, and the contactor D17 coil is powered on. Meanwhile, in the direct current power supply control loop, current flows out from a direct current power supply, enters a rectifier A21 and a rectifier B22 after passing through a breaker A19, is rectified and then is output, and at the moment, contacts 1701, 1702, 1703 and 1704 of a contactor D17 are closed due to the fact that a wire package of the contactor D17 is electrified, and finally is output.

In particular, in the control loop: the diode A5, the diode B9, the diode C15 and the diode D18 are connected in parallel to the contactor coil, so that the circuit is prevented from being damaged by counter electromotive force generated when the contactor coil is suddenly powered off. In the direct current power supply loop: when the circuit fails, the circuit breaker A19 can cut off the circuit, so that the system safety is ensured; the resistor A20 is a current limiting resistor and plays a role of a protection circuit. In the alternating current power supply loop: the fuse 23 can prevent the circuit from being damaged and burnt out and plays a role in protecting the circuit; the contacts 405, 406, 407, 408, 409 and 410 of the contactor A4 are connected with the contacts 411, 412, 413, 414, 415 and 416 in parallel, when the switches are connected in parallel, the current passing through a single switch can be reduced, the spark generated by overlarge current when the contacts are closed is prevented, the service life of the switch is prolonged, the use safety of a circuit is ensured, and the potential safety hazard is reduced; the resistor B26 and the resistor C28 are current limiting resistors and play a role of a protection circuit; the circuit breaker B27 can cut off the circuit and protect the circuit when the circuit fails.

Claims (9)

1. An excitation dual power supply circuit is characterized in that: the excitation control system comprises a control module and a power supply module, wherein the control module comprises an excitation signal control loop, and the power supply module comprises a direct current power supply loop and an alternating current power supply loop;

an interface A (2) and an interface B (3) for receiving an alternating current excitation signal are arranged in a line from a terminal A (1) to a terminal B (6) of the excitation signal control loop, wherein the interface A (2) is connected with the terminal A (1), the interface B (3) is connected with a wire package of a contactor A (4), the contactor A (4) and a diode A (5) are connected in parallel by taking a diode first end point (501) as a cathode, and a diode second end point (502) as an anode;

in the circuit from the terminal C (7) to the terminal D (10) of the excitation signal control loop, the terminal C (7) is sequentially connected with a first contact (401), a second contact (402), a third contact (403) and a fourth contact (404) of a contactor A (4), the fourth contact (404) is connected with a contactor B (8), the contactor B (8) and a diode B (9) are connected in parallel by taking a diode endpoint one (901) as a cathode, and a diode endpoint two (902) as an anode;

an interface C (12) and an interface D (13) for receiving a direct current excitation signal are arranged in a line from a terminal E (11) to a terminal F (16) of the excitation signal control loop, wherein the interface C (12) is connected with the terminal E (11), the interface D (13) is connected with a wire package of a contactor C (14), the contactor C (14) and a diode C (15) are connected in parallel by taking a diode A end point (1501) as a cathode, and a diode B end point (1502) as an anode.

2. The exciting dual power supply circuit according to claim 1, wherein the terminal E (11) is sequentially connected to a contact a (1401), a contact b (1402), a contact C (1403), and a contact Ding Chudian (1404) of the contactor C (14), the Ding Chudian (1404) is connected to a coil of the contactor D (17), the contactor D (17) is connected in parallel with the diode D (18) with a terminal I (1801) as a cathode, and a terminal II (1802) as an anode, and the contactor D (17) is connected to the terminal F (16).

3. The exciting dual power supply circuit according to claim 1, wherein the negative pole of the direct current power supply in the direct current power supply circuit is connected with an I-th contact (1901) and an II-th contact (1902) of a circuit breaker a (19), the II-th contact (1902) is connected with a resistor a (20), the resistor a (20) is connected with a rectifier a (21), and the rectifier a (21) is connected with a contact I (1701) and a contact II (1702) of a contactor D (17);

the positive pole of the direct current power supply in the direct current power supply loop is connected with a third contact (1903) and an fourth contact (1904) of the circuit breaker A (19), the fourth contact (1904) is connected with a rectifier B (22), and the rectifier B (22) is connected with a contact III (1703) and a contact IV (1704) of the contactor D (17).

4. A field double power supply circuit according to claim 3, characterized in that the resistor a (20) is a current limiting resistor.

5. The exciting double power supply circuit according to claim 1, wherein A, B, C three phases of an ac power supply in the ac power supply circuit are respectively connected with a fuse (23), the fuse (23) is respectively connected with a fifth contact (405) and a sixth contact (406), a seventh contact (407) and an eighth contact (408), a ninth contact (409) and a tenth contact (410) of a contactor a (4), the fifth contact (405) and the sixth contact (406) are connected in parallel with a fifteenth contact (415) and a sixteenth contact (416), the seventh contact (407) and the eighth contact (408) are connected in parallel with a thirteenth contact (413) and a fourteenth contact (414), the ninth contact (409) and the tenth contact (410) are connected in parallel with an eleventh contact (411) and a twelfth contact (412), the fifth contact (405) and the sixth contact (406), the seventh contact (407) and the eighth contact (409) and the tenth contact (410) of a contactor a (4) are respectively connected with a transformer (24) and a transformer (24) is connected with a transformer (25).

6. The exciting dual power supply circuit according to claim 5, wherein the negative electrode of the rectifier C (25) is connected to the first contact (801) and the second contact (802) of the contactor B (8), and the second contact (802) is connected to the contacts α (2701) and β (2702) of the breaker B (27);

the positive electrode of the rectifier C (25) is connected with a contact III (803) and a contact IV (804) of the contactor B (8), and the contact IV (804) is connected with a contact gamma (2703) and a contact delta (2704) of the breaker B (27).

7. The exciting dual power supply circuit according to claim 6, wherein a resistor B (26) is connected between the positive electrode and the negative electrode of the rectifier C (25), and the resistor B (26) is a current limiting resistor.

8. The exciting dual power supply circuit according to claim 6, wherein a resistor C (28) is connected between a contact β (2702) and a contact δ (2704) of the circuit breaker B (27).

9. The excitation dual power supply circuit of claim 8, wherein the resistor C (28) is a current limiting resistor.

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