CN111431447A - Generator output voltage wiring device and control protection method thereof - Google Patents

Abstract

The invention relates to the technical field of generators, in particular to a generator output voltage wiring device and a control protection method thereof. The wiring device comprises three circuit breakers with built-in electric switching on and off mechanisms, a plurality of relays, a generator set controller and a total output circuit breaker. The generator set controller controls an electric switching-on/switching-off mechanism inside the three circuit breakers through outputting control signals, and the switching-on/switching-off of the three circuit breakers is automatically coordinated and uniformly controlled through an electric linkage control relay mode, so that the internal winding of the generator set is automatically switched between a parallel connection star type and a series connection star type to realize different voltage output. The invention can automatically realize the automatic switching of the parallel connection star type and the series connection star type of the output voltage of the generator, and safely and comprehensively avoids accidents and potential safety hazards such as the burning of the generator and the like.

Description

Generator output voltage wiring device and control protection method thereof

Technical Field

The invention relates to the technical field of generators, in particular to a generator output voltage wiring device and a control protection method thereof.

Background

The diesel generating set is used as a standby and main power generation power supply and is widely applied in the international society at present. In the international construction machinery and electrical equipment rental market, particularly in the field of industrial power utilization, because industrial equipment power utilization requires power supplies of different voltages (e.g., three-phase 230V and three-phase 460V in philippine countries, american countries and regions: three-phase 220V and three-phase 440V-480V), it is often necessary to modify the output voltage of the generator in order to be able to provide the equipment with a power supply of a suitable regulated voltage.

In order to change the output voltage of the generator, in the early stage of the generator unit industry, the star-type parallel connection is changed into the switching series-connection star-type connection by opening a generator connection box and manually changing a generator winding connection method. However, the space of the generator wiring box is limited, and a professional is required to manually change the wiring mode, so that the requirement of simple and quick operation of a general user cannot be met. The mode that change wiring is replaced by a change-over switch and a contactor switch in later stage upgrading is adopted, although the output voltage of the generator is automatically switched, the switch such as the change-over switch and the contactor does not have the functions of overload and short-circuit protection of the load current of the generator winding and overvoltage protection, and meanwhile, the switch edges are easily fused or blocked by electric arcs generated when the switch is frequently switched for a long time, so that accidents and potential safety hazards such as burning of the internal winding of the generator occur, however, an effective solution and a control protection method are not available in the market at present.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a generator output voltage wiring device and a control protection method thereof. The device can realize the automatic switching of the parallel connection star type and the series connection star type of the output voltage of the generator in a fully automatic manner, and safely and comprehensively avoid accidents and potential safety hazards such as burning of the generator and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

a generator output voltage wiring device comprises a circuit breaker MCCB1, a circuit breaker MCCB2, a circuit breaker MCCB3, a relay KM2, a relay KM4, a relay QF1, a relay QF2, a relay QF3, a generator set controller and a generator set load output circuit breaker MCCB; the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are internally provided with an electric actuating on-off mechanism M-and a circuit breaker closing coil YC and a circuit breaker opening coil YO, and are also internally provided with a relay QF1, a relay QF2, a relay QF3, a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 correspondingly;

the generator winding T10, the generator winding T11 and the generator winding T12 are in short circuit and connected to a first phase, a second phase and a third phase of an outlet end of the circuit breaker MCCB2, and finally led out to an output neutral point of the generator N; the generator winding T4 is simultaneously connected to a first phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB3, the generator winding T5 is simultaneously connected to a second phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB3, and the generator winding T6 is simultaneously connected to a third phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB 3;

the generator winding T7 is connected to a first phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time, the generator winding T8 is connected to a second phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time, and the generator winding T9 is connected to a third phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time;

the generator winding T1 is connected to a first phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time, the generator winding T2 is connected to a second phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time, and the generator winding T3 is connected to a third phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time;

a P L C control function is set by a generator set controller, electric execution switching-on and switching-off mechanisms M-of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are controlled by whether a control signal is output or not and transmitted to the relay KM2, and switching-on and switching-off of the electric execution switching-on and switching-off mechanisms M-of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are coordinated and uniformly controlled in an electric linkage control relay KM2 mode, so that internal windings of the generator set are automatically switched from a parallel star type to a series star type.

Further, the generator set controller monitors the states of the auxiliary contacts of the closing feedback signals corresponding to the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 through an interlocking signal device consisting of the relay QF1, the relay QF2 and the relay QF 3; when the switching-on and switching-off position errors of the circuit breaker MCCB1, the circuit breaker MCCB2 and/or the circuit breaker MCCB3 occur, the generator set controller immediately outputs a protection signal to the relay KM4 to realize the forced switching-off of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3, protects the internal winding of the generator, and outputs an alarm and stops the operation of the generator set.

Further, when the switching-on/off position error is that the circuit breaker MCCB3 is switched on, the circuit breaker MCCB1 or the circuit breaker MCCB2 is switched on.

Further, the relay KM2 and the relay KM4 are both DC24V relays; the relay QF1, the relay QF2 and the relay QF3 are all DC24V relays; the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are all molded case circuit breakers; the generator set controller is a DSE7320 controller.

The invention also provides a control protection method of the generator output voltage wiring device, which comprises the following steps:

s1, in the running and using process, the generator set controller judges whether to output a molded case circuit breaker MCCB1, a molded case circuit breaker MCCB2 and/or a molded case circuit breaker MCCB3 switching-on/off control signal or not through the built-in alternative protection parameter and the P L C running protection parameter;

s2: when the default operation of the parallel star generator is performed and the voltage of the AC230V is output, no positive pole signal of the generator set controller is output to the relay KM2, so that the relay KM2 respectively sends out control signals to the closing coils YC of the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2, and the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 are in a switching-on position; meanwhile, a control signal is sent to a switching-off coil YO of a molded case circuit breaker MCCB3 through a relay KM2, so that the MCCB3 is in a switching-off position; therefore, a star-shaped parallel connection mode of the internal windings of the generator is realized, and the output of low-voltage AC230V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through a relay QF1, a relay QF2 and a relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are in the correct closing and opening positions is detected, and the switching instructions of the generator set controller are correctly executed by the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB 3; the generator set controller automatically operates and controls the generator set through built-in low-voltage operation protection parameters, once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate wrong switching-on/off positions, the generator set controller receives feedback signals of combinations of a relay QF1, a relay QF2 and/or a relay QF3 of switching-on signals of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3, and sends out forced breaking signals to a relay KM4, and forcedly breaks the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 through a breaking coil YO of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3, so that the internal winding of the generator is protected, the generator set is controlled to stop protection;

when the series star-type generator outputs AC460V voltage in replacement parameter operation, a signal is input to the No. 52 input terminal of the generator set controller through a manual switching-on switching control switch SW2, and a positive electrode signal of the No. 8 output terminal of the generator set controller is output to a relay KM2, so that control signals are respectively sent to a tripping coil YO of a molded case circuit breaker MCCB1 and a molded case circuit breaker MCCB2 through the relay KM2, and the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 are in tripping positions; meanwhile, a control signal is sent to a closing coil YC of the molded case circuit breaker MCCB3 through a relay KM2, so that the molded case circuit breaker MCCB3 is in a closing position; therefore, a series star connection mode of the internal windings of the generator is realized, and the output of high-voltage AC460V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through the relay QF1, the relay QF2 and the relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 are located at the correct closing and opening positions is detected, and the switching instruction of the generator set controller is correctly executed by the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB 3; the generator set controller automatically operates and controls the generator set through the operation protection parameters of the built-in high-voltage AC460V, and once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate wrong switching-on/off positions, the generator set controller receives feedback signals of combinations of the relays QF1, the relays QF2 and/or the relays QF3 of switching-on signals of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 and sends out forced breaking signals to the relay KM4, the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are controlled to break through the switching-off coil YO, the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are controlled, so that the internal winding of the generator set is protected.

Further, the wrong on/off position is triggered by overload and/or human misoperation.

Advantageous effects

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a generator output voltage wiring device and a control protection method thereof, which can automatically realize the automatic switching of the parallel connection star type and the series connection star type of the output voltage of a generator, so that the output voltage of a generator set can meet the requirements of electric equipment in different countries and regions, the requirements of different voltages are met, and accidents and potential safety hazards such as burning of internal windings of the generator caused by manual misoperation of non-professional personnel are avoided.

2. Due to the adoption of a circuit breaker combination, a switching-on and switching-off electric linkage control mode and auxiliary contact switching-on signal feedback, the generator controller can monitor the wiring state of the internal winding of the generator in real time, and accidents and potential safety hazards such as burning of the generator and the like are avoided more safely and comprehensively.

3. Due to the fact that the circuit breaker is combined with the switching-on and switching-off arc extinguishing chamber, other automatic transfer switches or contactor devices are avoided, and due to the fact that the switch is used for a long time, electric arcs (without an arc extinguishing device) generated when the switch is frequently switched are easy to melt or block a switch knife edge, accidents and potential safety hazards such as burning of inner windings of the generator occur.

4. Because the breaker combination has overvoltage/undervoltage protection, overload and short-circuit protection, the invention can effectively protect the generator set and avoid accidents and potential safety hazards such as burning of the internal winding of the generator and the like caused by overvoltage, overload, short-circuit fault and the like.

Drawings

FIG. 1 is a wiring device of the present invention in operation with a generator output voltage connected in parallel with a star winding;

FIG. 1a is an enlarged view of the wiring at molded case relay MCCB1 of FIG. 1;

FIG. 1b is an enlarged view of the wiring at molded case relay MCCB2 of FIG. 1;

FIG. 1c is an enlarged view of the wiring at molded case relay MCCB2 of FIG. 1;

FIG. 2 is a schematic diagram of the wiring arrangement of the present invention during operation of the generator output voltage in series with the star windings;

FIG. 2a is an enlarged view of the wiring at molded case relay MCCB1 of FIG. 2;

FIG. 2b is an enlarged view of the wiring at molded case relay MCCB2 of FIG. 2;

FIG. 2c is an enlarged view of the wiring at molded case relay MCCB3 of FIG. 2;

fig. 3 is a local wiring diagram of the generator set controller DSE 7320;

FIG. 3a is a wiring diagram of a relay KM 2;

FIG. 3b is a wiring diagram of relay KM 4;

FIG. 3c is a wiring diagram of the DC24V relay QF 1;

FIG. 3d is a wiring diagram of the DC24V relay QF 2;

FIG. 3e is a wiring diagram of the DC24V relay QF 3;

FIG. 4 shows a star-type connection method for the internal windings of the generator.

FIG. 5 shows the star connection method for the internal winding of the generator.

The symbols and reference numbers in the drawings illustrate:

t1.. T12: 12 outgoing cables and serial numbers of generator winding

L1, L2, L3 alternating current output of generator

MCCB: generator set AC output protection plastic shell circuit breaker

MCCB1, MCCB2, MCCB 3: plastic case breakers (built-in electric actuating on-off brake mechanism)

YC: inner closing coil of molded case circuit breaker MCCB1/2/3

YO: molded case circuit breaker MCCB1/2/3 internal opening coil

M to: electric actuating opening and closing mechanism in molded case circuit breaker MCCB1/2/3

KM 2: DC24V relay for controlling opening and closing of moulded case circuit breaker MCCB1/2/3

KM 4: DC24V relay for controlling forced opening of moulded case circuit breaker MCCB1/2/3

QF1, QF2, QF 3: DC24V relay for feeding back closing signal of MCCB1/2/3 of molded case circuit breaker

FU11, FU12, FU21, FU22, FU31, FU32, FU1

Q/1, Q/2, Q/3: auxiliary contact of internal closing signal of molded case circuit breaker MCCB1/2/3

1/2/3/4/5/6 parts by weight: terminal block

SW 1: storage battery switch

SW 2: switching control switch (series star 460V)

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

Referring to fig. 1, 2, 3, 4, and 5, the present embodiment provides a generator output voltage wiring device, including a molded case circuit breaker MCCB1, a molded case circuit breaker MCCB2, a molded case circuit breaker MCCB3, a DC24V relay KM2, a DC24V relay KM4, a DC24V relay QF1, a DC24V relay QF2, a DC24V relay QF3, a genset controller DSE7320, and a genset load output circuit breaker MCCB; the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are internally provided with electric actuating opening and closing mechanisms M-and circuit breaker closing coils YC and circuit breaker opening coils YO, and are also internally provided with a DC24V relay QF1, a DC24V relay QF2, a DC24V relay QF3, a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 correspondingly, and the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 can respectively correspond to feedback circuit breaker auxiliary contact closing signals.

The generator winding T10, the generator winding T11 and the generator winding T12 are in short circuit and connected to a first phase, a second phase and a third phase of an outlet end of a molded case circuit breaker MCCB2, and finally led out to an output neutral point of a generator N; the generator winding T4 is simultaneously connected to a first phase of a wire inlet end of the moulded case circuit breaker MCCB2 and a wire inlet end of the moulded case circuit breaker MCCB3, the generator winding T5 is simultaneously connected to a second phase of a wire inlet end of the moulded case circuit breaker MCCB2 and a wire inlet end of the moulded case circuit breaker MCCB3, and the generator winding T6 is simultaneously connected to a third phase of a wire inlet end of the moulded case circuit breaker MCCB2 and a wire inlet end of the moulded case circuit breaker MCCB 3;

the generator winding T7 is connected to a first phase of an outlet terminal of a molded case circuit breaker MCCB3 and an inlet terminal of a molded case circuit breaker MCCB1 at the same time, the generator winding T8 is connected to a second phase of an outlet terminal of a molded case circuit breaker MCCB3 and an inlet terminal of a molded case circuit breaker MCCB1 at the same time, and the generator winding T9 is connected to a third phase of an outlet terminal of a molded case circuit breaker MCCB3 and an inlet terminal of a molded case circuit breaker MCCB1 at the same time;

the generator winding T1 is connected to a first phase of an outlet terminal of a molded case circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB, the generator winding T2 is connected to a second phase of an outlet terminal of a molded case circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB, and the generator winding T3 is connected to a third phase of an outlet terminal of a molded case circuit breaker MCCB1 and an inlet terminal of the generator set load output circuit breaker MCCB.

To show some details of fig. 1 and 2 more clearly, enlarged views of fig. 1a, 1b and 1c are given of the wiring at molded case relay MCCB1/2/3 of fig. 1; the wiring scheme at molded case relay MCCB1/2/3 in fig. 2 is shown in an enlarged view in fig. 2a, 2b and 2 c.

With continued reference to fig. 3a, No. 8, 5, 6, 13, 7, 3, 1, 4, 2, 11, 9 terminals of relay KM2 are connected, respectively, line number 6, line number 71A, line number 71B, line number 71C, line number 5, line number 75A, line number 70A, line number 75B, line number 70C, line number 75C to DC 24V. Referring to fig. 3B, No. 8, 5, 6, 13, 7, 3, 4, 11 terminals of line No. 8, line No. 75A, line No. 75B, line No. 75C, line No. 7, line No. 73A, line No. 73B, line No. 73C to DC24V relay KM4 were connected, respectively. Referring to fig. 3c, terminals No. 8, 5, 7, 1 of relay QF1 are connected, respectively, line number 76A, line number 20D, line number 32A, line number 20B to DC 24V. Referring to fig. 3d, line number 76B, line number 20C, line number 32B, line number 20E to DC24V relay No. 8, 5, 7, 1 terminals of QF2 are connected, respectively. Referring to fig. 3e, line number 76C, line number 20, line number 32C, line number 20A through DC24V relay QF3 terminals No. 8, 5, 7, 3 are connected, respectively.

A P L C control function is set by a generator set controller DSE7320, an electric actuating switching-on/off mechanism M of a molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is controlled by whether a control signal is output or not to be transmitted to a DC24V relay KM2, and the switching-on/off of the electric actuating switching-on/off mechanism M of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is coordinated and uniformly controlled in an electric linkage control DC24V relay KM2 mode, so that the internal winding of the generator set is automatically switched from a parallel star to a series star.

The generating set controller DSE7320 monitors the states of auxiliary contacts of closing feedback signals corresponding to the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 through an interlocking signal device consisting of a DC24V relay QF1, a DC24V relay QF2 and a DC24V relay QF 3; when the opening and closing position errors of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 occur (for example, when the molded case circuit breaker MCCB3 is closed, the molded case circuit breaker MCCB1 or the molded case circuit breaker MCCB2 is closed), the generator set controller DSE7320 immediately outputs a protection signal to the relay KM4 to realize the forced opening and closing of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3, protect the internal winding of the generator, and output an alarm and stop the operation of the generator set.

The embodiment also provides a control protection method of the generator output voltage wiring device, which comprises the following steps:

s1, in the running and using process, the generator set controller judges whether to output a molded case circuit breaker MCCB1, a molded case circuit breaker MCCB2 and/or a molded case circuit breaker MCCB3 switching-on/off control signal or not through the built-in alternative protection parameter and the P L C running protection parameter;

s2: when the default operation of the parallel star generator is performed and the voltage of the AC230V is output, the generator set controller DSE7320 outputs no positive signal to the DC24V relay KM2, so that the DC24V relay KM2 respectively sends control signals to the closing coils YC of the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 to enable the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 to be in a switching-on position; meanwhile, a DC24V relay KM2 sends a control signal to a tripping coil YO of the molded case circuit breaker MCCB3, so that the molded case circuit breaker MCCB3 is in a tripping position; therefore, a star-shaped parallel connection mode of the internal windings of the generator is realized, and the output of low-voltage AC230V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through a DC24V relay QF1, a DC24V relay QF2 and a DC24V relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are in the correct closing and opening positions is detected, and the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are ensured to correctly execute the switching instruction of the generator set controller; the generator set controller automatically operates and controls the generator set through built-in low-voltage operation protection parameters, once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate wrong switching-on/off positions, the generator set controller DSE7320 receives feedback signals of the combination of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 switching-on signals of a DC24V relay QF1, a DC24V relay QF2 and/or a DC24V relay QF3, sends out forced breaking signals to a DC24V relay KM4, forcibly breaks the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 through a control of a molded case circuit breaker MCCB1, a molded case circuit breaker MCCB2 and a switching-off coil YO of a molded case circuit breaker CB3, thereby protecting the internal winding of the generator set and controlling the generator set to stop protection.

When the series star-type generator outputs AC460V voltage in replacement parameter operation, a signal is input to a No. 52 input terminal of a generator set controller through a manual switch-on switching control switch SW2, and a positive (+) signal of a No. 8 output terminal of the generator set controller DSE7320 is output to a DC24V relay KM2, so that control signals are respectively sent to a brake separating coil YO of a molded case circuit breaker MCCB1 and a molded case circuit breaker MCCB2 through a DC24V relay KM2, and the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 are in brake separating positions; meanwhile, a DC24V relay KM2 sends a control signal to a closing coil YC of the molded case circuit breaker MCCB3, so that the molded case circuit breaker MCCB3 is in a closing position; therefore, a series star connection mode of the internal windings of the generator is realized, and the output of high-voltage AC460V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through a DC24V relay QF1, a DC24V relay QF2 and a DC24V relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 are in the correct closing and opening positions is detected, and the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are ensured to correctly execute the switching instruction of the generator set controller DSE 7320; the generator set controller automatically operates and controls the generator set through the operation protection parameters of the built-in high-voltage AC460V, and once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate an overload or an erroneous switching-on/off position triggered by human misoperation and other reasons, the generator set controller receives a feedback signal of a combination of a DC24V relay QF1, a DC24V relay QF2 and/or a DC24V QF3 of switching-on signals of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 and sends a forced switching-off signal to the DC24V relay KM4, forcibly breaking the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 by controlling the breaking coil YO of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3, therefore, the internal winding of the generator is protected, the generator set is controlled to be shut down and protected, and the fault reason is checked by workers.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (6)

1. A generator output voltage termination characterized in that: the system comprises a circuit breaker MCCB1, a circuit breaker MCCB2, a circuit breaker MCCB3, a relay KM2, a relay KM4, a relay QF1, a relay QF2, a relay QF3, a generating set controller and a generating set load output circuit breaker MCCB; the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are internally provided with an electric actuating on-off mechanism M-and a circuit breaker closing coil YC and a circuit breaker opening coil YO, and are also internally provided with a relay QF1, a relay QF2, a relay QF3, a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 correspondingly;

the generator winding T10, the generator winding T11 and the generator winding T12 are in short circuit and connected to a first phase, a second phase and a third phase of an outlet end of the circuit breaker MCCB2, and finally led out to an output neutral point of the generator N; the generator winding T4 is simultaneously connected to a first phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB3, the generator winding T5 is simultaneously connected to a second phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB3, and the generator winding T6 is simultaneously connected to a third phase at the incoming line end of the circuit breaker MCCB2 and the incoming line end of the circuit breaker MCCB 3;

the generator winding T7 is connected to a first phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time, the generator winding T8 is connected to a second phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time, and the generator winding T9 is connected to a third phase of an outlet terminal of the circuit breaker MCCB3 and an inlet terminal of the circuit breaker MCCB1 at the same time;

the generator winding T1 is connected to a first phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time, the generator winding T2 is connected to a second phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time, and the generator winding T3 is connected to a third phase of an outlet terminal of a circuit breaker MCCB1 and an inlet terminal of a generator set load output circuit breaker MCCB at the same time;

a P L C control function is set by a generator set controller, electric execution switching-on and switching-off mechanisms M-of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are controlled by whether a control signal is output or not and transmitted to the relay KM2, and switching-on and switching-off of the electric execution switching-on and switching-off mechanisms M-of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are coordinated and uniformly controlled in an electric linkage control relay KM2 mode, so that internal windings of the generator set are automatically switched from a parallel star type to a series star type.

2. The generator output voltage connection of claim 1, wherein: the generating set controller monitors the states of the auxiliary contacts of the circuit breaker MCCB1, the circuit breaker MCCB2 and the corresponding closing feedback signal of the circuit breaker MCCB3 through an interlocking signal device consisting of a relay QF1, a relay QF2 and a relay QF 3; when the switching-on and switching-off position errors of the circuit breaker MCCB1, the circuit breaker MCCB2 and/or the circuit breaker MCCB3 occur, the generator set controller immediately outputs a protection signal to the relay KM4 to realize the forced switching-off of the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3, protects the internal winding of the generator, and outputs an alarm and stops the operation of the generator set.

3. The generator output voltage connection of claim 2, wherein: when the switching-on/off position error is the switching-on of the circuit breaker MCCB3, the circuit breaker MCCB1 or the circuit breaker MCCB2 is switched on.

4. Generator output voltage connection device according to any of claims 1-3, characterized in that: the relay KM2 and the relay KM4 are both DC24V relays; the relay QF1, the relay QF2 and the relay QF3 are all DC24V relays; the circuit breaker MCCB1, the circuit breaker MCCB2 and the circuit breaker MCCB3 are all molded case circuit breakers; the generator set controller is a DSE7320 controller.

5. A control protection method using the generator output voltage wiring device according to any one of claims 1 to 4, comprising the steps of:

s1, in the running and using process, the generator set controller judges whether to output a molded case circuit breaker MCCB1, a molded case circuit breaker MCCB2 and/or a molded case circuit breaker MCCB3 switching-on/off control signal or not through the built-in alternative protection parameter and the P L C running protection parameter;

s2: when the default operation of the parallel star generator is performed and the voltage of the AC230V is output, no positive pole signal of the generator set controller is output to the relay KM2, so that the relay KM2 respectively sends out control signals to the closing coils YC of the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2, and the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 are in a switching-on position; meanwhile, a control signal is sent to a switching-off coil YO of a molded case circuit breaker MCCB3 through a relay KM2, so that the MCCB3 is in a switching-off position; therefore, a star-shaped parallel connection mode of the internal windings of the generator is realized, and the output of low-voltage AC230V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through a relay QF1, a relay QF2 and a relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are in the correct closing and opening positions is detected, and the switching instructions of the generator set controller are correctly executed by the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB 3; the generator set controller automatically operates and controls the generator set through built-in low-voltage operation protection parameters, once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate wrong switching-on/off positions, the generator set controller receives feedback signals of combinations of a relay QF1, a relay QF2 and/or a relay QF3 of switching-on signals of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3, and sends out forced breaking signals to a relay KM4, and forcedly breaks the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 through a breaking coil YO of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3, so that the internal winding of the generator is protected, the generator set is controlled to stop protection;

when the series star-type generator outputs AC460V voltage in replacement parameter operation, a signal is input to the No. 52 input terminal of the generator set controller through a manual switching-on switching control switch SW2, and a positive electrode signal of the No. 8 output terminal of the generator set controller is output to a relay KM2, so that control signals are respectively sent to a tripping coil YO of a molded case circuit breaker MCCB1 and a molded case circuit breaker MCCB2 through the relay KM2, and the molded case circuit breaker MCCB1 and the molded case circuit breaker MCCB2 are in tripping positions; meanwhile, a control signal is sent to a closing coil YC of the molded case circuit breaker MCCB3 through a relay KM2, so that the molded case circuit breaker MCCB3 is in a closing position; therefore, a series star connection mode of the internal windings of the generator is realized, and the output of high-voltage AC460V is realized; meanwhile, the electric interlocking combination of the positions of a closing feedback signal auxiliary contact Q/1, a closing feedback signal auxiliary contact Q/2 and a closing feedback signal auxiliary contact Q/3 of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 is monitored through the relay QF1, the relay QF2 and the relay QF3, so that whether the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 are located at the correct closing and opening positions is detected, and the switching instruction of the generator set controller is correctly executed by the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB 3; the generator set controller automatically operates and controls the generator set through the operation protection parameters of the built-in high-voltage AC460V, and once the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 generate wrong switching-on/off positions, the generator set controller receives feedback signals of combinations of the relays QF1, the relays QF2 and/or the relays QF3 of switching-on signals of the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and/or the molded case circuit breaker MCCB3 and sends out forced breaking signals to the relay KM4, the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are controlled to break through the switching-off coil YO, the molded case circuit breaker MCCB1, the molded case circuit breaker MCCB2 and the molded case circuit breaker MCCB3 are controlled, so that the internal winding of the generator set is protected.

6. The control protection method of claim 5, wherein: the wrong on/off position is triggered by overload and/or human misoperation.

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