CN215344413U - Electrical control system of high-voltage frequency converter bypass wiring one-to-two mode - Google Patents
Electrical control system of high-voltage frequency converter bypass wiring one-to-two mode Download PDFInfo
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- CN215344413U CN215344413U CN202121161136.2U CN202121161136U CN215344413U CN 215344413 U CN215344413 U CN 215344413U CN 202121161136 U CN202121161136 U CN 202121161136U CN 215344413 U CN215344413 U CN 215344413U
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Abstract
The utility model discloses an electrical control system of a high-voltage frequency converter bypass wiring one-to-two mode; the system comprises a high-voltage switch cabinet, a frequency converter, a bypass cabinet and a high-voltage motor; the high-voltage switch cabinet comprises a 1# switch cabinet and a 2# switch cabinet; the bypass cabinets comprise a 1# bypass cabinet and a 2# bypass cabinet; an isolating switch QS1, an isolating switch QS2 and an isolating switch QS3 are arranged inside the 1# bypass cabinet, and an isolating switch QS4, an isolating switch QS5 and an isolating switch QS6 are arranged inside the 2# bypass cabinet; the high-voltage motor comprises a 1# motor and a 2# motor; isolating switch QS1 is electrically and mechanically interlocked with isolating switch QS3, isolating switch QS4 is electrically and mechanically interlocked with isolating switch QS6, isolating switch QS1 is electrically interlocked with isolating switch QS4, and isolating switch QS2 is electrically interlocked with isolating switch QS 5. The utility model can solve the problems of high PLC control failure rate and operation safety caused by misoperation in the conventional frequency converter one-drive-two electric control system.
Description
Technical Field
The utility model belongs to the technical field of electrical control, and particularly relates to an electrical control system with a high-voltage frequency converter bypass wiring one-to-two mode.
Background
The scheme of the one-to-two bypass mode electrical control system of the high-voltage frequency converter can adjust the running rotating speed of the high-voltage motor and effectively control project investment, so that the one-to-two bypass mode electrical control of the high-voltage frequency converter is widely applied at present; however, high-voltage inverter cabinet bypass cabinet manufacturers have different design conditions and different power and control systems, so that various problems can occur in the actual use process, the overhaul difficulty is increased, and potential safety hazards are brought to electrical control.
The main problems that exist in the one-to-two technology of the existing high-voltage frequency converter:
1. the main wiring of the high-voltage power supply system is different, the circuit breakers (QF 1 and QF 2) in the 1#, 2# high-voltage switch cabinets of the frequency converter and the isolating switches (QS 1 and QS 2) in the 1#, 2# bypass cabinets are connected, and the situation of power supply parallel power supply, unexpected power transmission or power supply short circuit can occur due to the simultaneous closing of misoperation; isolating switches (QS 2 and QS 5) in the 1# and 2# bypass cabinets are closed at the same time due to misoperation, so that the frequency converter can be subjected to overload operation and overcurrent burning; three isolating switches in the same bypass cabinet are closed simultaneously due to misoperation, so that overvoltage faults of a frequency converter and incapability of variable-speed operation of a motor can be caused.
2. Although the problem pointed out in '1' can be solved by controlling the opening and closing of the high-voltage contactor through the PLC, the problems that the control function is lost due to the power failure of the PLC, the program stability is poor, the fault rate is high due to the complex structure and the large number of the contactors exist.
3. Utilize high voltage isolator's switching function, high tension switchgear, bypass cabinet and motor can realize corresponding distribution, nevertheless exist because staff's maloperation leads to high tension switchgear, bypass cabinet and motor to appear the distribution that does not correspond, arouses the cooperation mode and the potential abnormal operation risk that three unpredictable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an electrical control system with a one-to-two mode of bypass wiring of a high-voltage frequency converter; the problem of the operation safety that PLC control fault rate is high and the maloperation brings in among the electric control system of one dragging two of current converter is solved to the purpose.
In order to achieve the purpose, the utility model adopts the technical scheme that:
an electrical control system of a high-voltage frequency converter bypass wiring one-to-two mode comprises:
the high-voltage switch cabinet comprises a 1# switch cabinet and a 2# switch cabinet, wherein the 1# switch cabinet is provided with a high-voltage circuit breaker QF1, and the 2# switch cabinet is provided with a high-voltage circuit breaker QF 2;
a high voltage frequency converter C;
the bypass cabinet comprises a 1# bypass cabinet and a 2# bypass cabinet; an isolating switch QS1, an isolating switch QS2 and an isolating switch QS3 are arranged inside the 1# bypass cabinet, and an isolating switch QS4, an isolating switch QS5 and an isolating switch QS6 are arranged inside the 2# bypass cabinet; the isolating switch QS1 is connected with the outlet end of the high-voltage circuit breaker QF1, and the isolating switch QS4 is connected with the outlet end of the high-voltage circuit breaker QF 2; the isolating switch QS1 and the isolating switch QS4 are connected with the input end of the high-voltage frequency converter C; an isolating switch QS2 and an isolating switch QS5 are connected with the output end of the high-voltage frequency converter C, an isolating switch QS3 is connected between the incoming line end of the isolating switch QS1 and the outgoing line end of the isolating switch QS2, and an isolating switch QS6 is connected between the incoming line end of the isolating switch QS4 and the outgoing line end of the isolating switch QS 5;
the high-voltage motor comprises a 1# motor and a 2# motor; an outlet end of an isolating switch QS2 is connected with the 1# motor, and an outlet end of an isolating switch QS5 is connected with the 2# motor;
wherein, the isolating switch QS1 is electrically and mechanically interlocked with the isolating switch QS3, and the isolating switch QS1 and the isolating switch QS3 cannot be closed at the same time; the isolating switch QS4 and the isolating switch QS6 are electrically and mechanically interlocked and connected, and the isolating switch QS4 and the isolating switch QS6 cannot be closed at the same time; the isolating switch QS1 is electrically interlocked with the isolating switch QS4, and the isolating switch QS1 and the isolating switch QS4 cannot be closed at the same time; the electrical interlock connection of disconnector QS2 and disconnector QS5 cannot both be closed at the same time.
Further, a switch-on intermediate relay K7, a switch-off intermediate relay K8 and a trip intermediate relay K9 are arranged at a spreading node of the high-voltage frequency converter C, and corresponding intermediate relays K1-K6 are arranged on isolating switches QS 1-QS 6 in a spreading mode; an upper computer on-frequency switching-on/switching-off loop, a frequency converter switching-on loop, a frequency converter switching-off loop, a circuit breaker switching-on state circuit, a circuit breaker switching-off state circuit and an emergency stop tripping loop are formed through wiring.
Further, the upper computer power frequency switching on/off loop comprises a No. 1 motor power frequency switching on/off control loop and a No. 2 motor power frequency switching on/off control loop; in the power frequency switching-on control loop of the 1# motor, a PLC controller remotely controls a normally-open point, a normally-open point of an intermediate relay K3, a normally-closed point of an intermediate relay K1 and a normally-closed point of an intermediate relay K2 to be connected in series and connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF1, so that the switching-on/switching-off of the high-voltage circuit breaker QF1 in the 1# switch cabinet can only control the power frequency switching-on/off of the 1# motor; in the power frequency switching-on control loop of the 2# motor, a PLC controller remotely controls a normally-open point, a normally-open point of an intermediate relay K6, a normally-closed point of an intermediate relay K4 and a normally-closed point of an intermediate relay K5 to be connected in series and connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF2, so that the switching-on/switching-off of the high-voltage circuit breaker QF2 in the 2# switch cabinet can only control the power frequency switching-on/off of the 2# motor.
Further, the frequency converter switching-on loop comprises a 1# motor frequency conversion switching-on control loop and a 2# motor frequency conversion switching-on control loop; in the variable-frequency switching-on control loop of the 1# motor, a normally-open point of a switching-on intermediate relay K7, a normally-open point of an intermediate relay K1, a normally-open point of an intermediate relay K2 and a normally-closed point of an intermediate relay K3 are connected in series and are connected into a switching-on relay loop of a superior high-voltage circuit breaker QF1 in series, so that the frequency converter can only control the variable-frequency starting of the 1# motor; in the 2# motor frequency conversion closing control circuit, a normally-open point of a closing intermediate relay K7, a normally-open point of an intermediate relay K4, a normally-open point of an intermediate relay K5 and a normally-closed point of an intermediate relay K6 are connected in series and are connected into a closing relay circuit of a superior high-voltage circuit breaker QF2 in series, and the frequency conversion starting of a frequency converter which can only control a 2# motor is realized.
Further, the frequency converter brake-separating loop comprises a 1# motor frequency conversion brake-separating control loop and a 2# motor frequency conversion brake-separating control loop; in the variable-frequency opening control loop of the 1# motor, a normally open point of an opening intermediate relay K8 and a normally open point of an intermediate relay K1 are connected in series and are connected into a QF1 opening relay loop of a superior high-voltage circuit breaker in series, so that the frequency converter can only control the variable frequency of the 1# motor to stop; in the 2# motor variable frequency brake-separating control loop, a normally open point of a brake-separating intermediate relay K8 and a normally open point of an intermediate relay K4 are connected in series and are connected into a superior high-voltage circuit breaker QF2 brake-separating relay loop in series, so that the frequency converter can only control the variable frequency stop of the 2# motor;
further, the circuit breaker closing state circuit is used as a ready condition for starting the motor by the frequency converter, and comprises a QF1 closing state circuit and a QF2 closing state circuit; in a QF1 switching-on state circuit, an intermediate relay K1 normally open point is connected in series with a high-voltage circuit breaker QF1 normally open point; in a QF2 switching-on state circuit, an intermediate relay K4 normally open point is connected in series with a high-voltage circuit breaker QF2 normally open point; the two loops are connected in parallel and then connected into a control module of the high-voltage frequency converter C, the two loops are connected in parallel and then input joint ready state signals of the high-voltage circuit breaker QF1, the 1# bypass cabinet, the high-voltage circuit breaker QF2 and the 2# bypass cabinet to the control module of the frequency converter, and the frequency converter can start a 1# or 2# motor.
Further, the breaker opening state circuit is used as a motor under the non-variable frequency dragging ready condition, and comprises a QF1 opening state circuit and a QF2 opening state circuit; in the QF1 opening state circuit, an intermediate relay K4 normally closed point is connected in series with a high-voltage circuit breaker QF1 normally closed point; in the QF2 opening state circuit, an intermediate relay K1 normally closed point is connected in series with a high-voltage circuit breaker QF2 normally closed point; the two loops are connected in parallel and then connected with a control module of the high-voltage frequency converter C, joint non-frequency-conversion ready state signals of the high-voltage circuit breaker QF2, the 1# bypass cabinet, the high-voltage circuit breaker QF2 and the 1# bypass cabinet are input to the frequency converter control module after the two loops are connected in parallel, and at the moment, the frequency converter cannot start the 1# motor and the 2# motor.
Further, the scram trip circuit comprises a QF1 trip circuit and a QF2 trip circuit; in the QF1 trip circuit, a normally open point of an intermediate relay K2 and a normally closed point of a trip intermediate relay K9 are connected in series and are connected in series to a superior high-voltage breaker QF1 comprehensive protection open input trip circuit, so that the high-voltage breaker QF1 in a 1# high-voltage switch cabinet is controlled by a frequency converter to suddenly stop and trip; in the QF2 tripping circuit, a normally-open point of an intermediate relay K5 and a normally-closed point of a tripping intermediate relay K9 are connected in series and are connected in a comprehensive input quantity tripping circuit of a superior high-voltage circuit breaker QF2 in series, so that the high-voltage circuit breaker QF2 in a 2# high-voltage switch cabinet is controlled by a frequency converter to suddenly stop and trip.
The utility model has the beneficial effects that:
the utility model utilizes an electric interlocking to control the actions of the disconnecting switch and the circuit breaker, and particularly utilizes a physical wiring mode to carry out interlocking control on the disconnecting switch and the circuit breaker by expanding an intermediate relay; the design scheme can effectively avoid the situations of power supply parallel connection power supply, unexpected power transmission or power supply short circuit caused by misoperation and the problem of frequency converter damage caused by misoperation; meanwhile, the problem of abnormal operation risk caused by power distribution which does not correspond to the power distribution can be avoided; compared with the PLC control contactor switching, the design scheme can improve the system control stability and reduce the system fault rate.
In the utility model, the frequency converter commands to respectively control the opening and closing of QF1 and QF2 and trip through the wiring of the bypass cabinet system, and receives the opening and closing feedback signals of QF1 and QF2, thereby being beneficial to further improving the safety of system operation in the whole system operation process.
Drawings
FIG. 1 is a schematic diagram of the system control of the present invention;
FIG. 2 is a signal expansion diagram of a system control diagram of the present invention;
fig. 3 is a signal control schematic diagram in the control diagram of the system of the present invention.
Detailed Description
The preferred embodiments of the present invention are described below with reference to the accompanying drawings:
as shown in fig. 1 to 3, an electrical control system of a high-voltage frequency converter C in a bypass-connected one-to-two mode; the system comprises a high-voltage switch cabinet, a high-voltage frequency converter C, a bypass cabinet and a high-voltage motor.
The high-voltage switch cabinet comprises a 1# switch cabinet and a 2# switch cabinet, wherein the 1# switch cabinet is provided with a high-voltage circuit breaker QF1, and the 2# switch cabinet is provided with a high-voltage circuit breaker QF 2; the 1# switch cabinet and the 2# switch cabinet are used for supplying power to the high-voltage motor, and the high-voltage circuit breaker QF1 and the high-voltage circuit breaker QF2 are used for switching on and off of a power supply.
The high-voltage frequency converter C is internally provided with a control module, and the control module is used for receiving signals and carrying out circuit control.
The bypass cabinet comprises a 1# bypass cabinet and a 2# bypass cabinet. An isolating switch QS1, an isolating switch QS2 and an isolating switch QS3 are arranged inside the 1# bypass cabinet; the isolating switch QS1 and the isolating switch QS2 are respectively connected to the input end and the output end of the high-voltage frequency converter C, and the isolating switch QS1 is connected to the outlet end of the high-voltage circuit breaker QF 1; an isolating switch QS3 is connected between the inlet terminal of isolating switch QS1 and the outlet terminal of isolating switch QS 2. An isolating switch QS4, an isolating switch QS5 and an isolating switch QS6 are arranged inside the No. 2 bypass cabinet; the isolating switch QS4 and the isolating switch QS5 are respectively connected to the input end and the output end of the high-voltage frequency converter C, and the isolating switch QS4 is connected to the outlet end of the high-voltage circuit breaker QF 2; an isolating switch QS6 is connected between the inlet terminal of isolating switch QS4 and the outlet terminal of isolating switch QS 5. In order to avoid unpredictable power distribution problems and faults caused by manual misoperation, an isolating switch QS1 is electrically and mechanically interlocked with an isolating switch QS3, and an isolating switch QS4 is electrically and mechanically interlocked with an isolating switch QS6, so that the interlocking design can realize accurate switching of the working state of a 1# motor or a 2# motor power/frequency conversion; the isolating switch QS1 is electrically interlocked and connected with the isolating switch QS4, the isolating switch QS2 is electrically interlocked and connected with the isolating switch QS5, and the interlocking design can enable the 1# motor or the 2# motor to be independent from each other during operation, and the state of simultaneous power frequency or simultaneous variable frequency operation does not occur.
The high-voltage motor comprises a 1# motor and a 2# motor; an outlet end of an isolating switch QS2 is connected with the 1# motor, and an outlet end of an isolating switch QS5 is connected with the 2# motor.
In order to increase the control stability and safety, a C expansion node of the high-voltage frequency converter is provided with a closing intermediate relay K7, a breaking intermediate relay K8 and a tripping intermediate relay K9, and isolating switches QS 1-QS 6 are provided with corresponding intermediate relays K1-K6 in an expansion mode; an upper computer on-frequency switching-on/switching-off loop, a frequency converter switching-on loop, a frequency converter switching-off loop, a circuit breaker switching-on state circuit, a circuit breaker switching-off state circuit and an emergency stop tripping loop are formed through wiring.
The upper computer power frequency switching-on/switching-off loop comprises a 1# motor power frequency switching-on/switching-off control loop and a 2# motor power frequency switching-on/switching-off control loop. In the power frequency switching-on/switching-off control loop of the No. 1 motor, a PLC controller remotely controls a normally-on point, a normally-on point of an intermediate relay K3, a normally-off point of an intermediate relay K1 and a normally-off point of an intermediate relay K2 to be connected in series and connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF1 in series, and when an isolating switch QS1 and an isolating switch QS2 are disconnected, an isolating switch QS3 is closed, so that the PLC remote switching-on/switching-off high-voltage circuit breaker QF1 is realized. In a power frequency switching-on/switching-off control loop of the No. 2 motor, a PLC controller remotely controls a normally-on point, a normally-on point of an intermediate relay K6, a normally-off point of an intermediate relay K4 and a normally-off point of an intermediate relay K5 to be connected in series and connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF2, and when an isolating switch QS4 and an isolating switch QS5 are disconnected, an isolating switch QS6 is closed, so that the PLC remote switching-on/switching-off high-voltage circuit breaker QF2 is realized.
The frequency converter switching-on loop comprises a 1# motor frequency conversion switching-on control loop and a 2# motor frequency conversion switching-on control loop. In the variable-frequency switching-on control circuit of the 1# motor, a normally-open point of a switching-on intermediate relay K7, a normally-open point of an intermediate relay K1, a normally-open point of an intermediate relay K2 and a normally-closed point of an intermediate relay K3 are connected in series and are connected into a switching-on relay circuit of a superior high-voltage circuit breaker QF1 in series, when an isolating switch QS1 and an isolating switch QS2 are closed, the isolating switch QS3 is disconnected, and the switching-on of the switching-on high-voltage circuit breaker QF1 is controlled by a control module inside the frequency converter. In the 2# motor variable frequency switching-on control circuit, a normally-open point of a switching-on intermediate relay K7, a normally-open point of an intermediate relay K4, a normally-open point of an intermediate relay K5 and a normally-closed point of an intermediate relay K6 are connected in series and are connected into a switching-on relay circuit of a superior high-voltage circuit breaker QF2 in series, when an isolating switch QS4 and an isolating switch QS5 are closed, the isolating switch QS6 is disconnected, and the switching-on of the high-voltage circuit breaker QF2 is controlled by a control module inside the frequency converter.
The frequency converter switching-off loop comprises a 1# motor frequency conversion switching-off control loop and a 2# motor frequency conversion switching-off control loop. In the variable-frequency opening control loop of the 1# motor, a normally open point of an opening intermediate relay K8 and a normally open point of an intermediate relay K1 are connected in series and are connected into an opening relay loop of a superior high-voltage circuit breaker QF1 in series, when the variable-frequency operation of the 1# motor stops, an isolating switch QS1 is required to be closed and the 1# motor operates, and the control module in the frequency converter is used for controlling the opening of the high-voltage circuit breaker QF 1. In the 2# motor variable frequency brake-separating control loop, a normally open point of a brake-separating intermediate relay K8 and a normally open point of an intermediate relay K4 are connected in series and are connected into a superior high-voltage circuit breaker QF2 brake-separating relay loop in series, when the 2# motor is stopped in variable frequency operation, an isolating switch QS4 is required to be closed, and a 1# motor is required to operate, so that the control module in the frequency converter controls the high-voltage circuit breaker QF2 to be switched off.
The breaker closing state circuit comprises a QF1 closing state circuit and a QF2 closing state circuit. In a QF1 switching-on state circuit, an intermediate relay K1 normally open point is connected in series with a high-voltage circuit breaker QF1 normally open point; in a QF2 closing state circuit, an intermediate relay K4 normally open point is connected in series with a high-voltage breaker QF2 normally open point. The QF1 switching-on state circuit and the QF2 switching-on state circuit are connected in parallel and then are connected into a control module in the high-voltage frequency converter C, when the high-voltage circuit breaker QF1 and the disconnecting switch QS1 are closed, the high-voltage frequency converter C control module receives switching-on state feedback of the high-voltage circuit breaker QF1, when the high-voltage circuit breaker QF2 and the disconnecting switch QS4 are closed, the high-voltage frequency converter C control module receives switching-on state feedback of the high-voltage circuit breaker QF2, and when the switching-on state circuit of the QF1 or the switching-on state circuit of the QF2 is in a switching-on state, the frequency converter can start the 1# motor or the 2# motor.
The breaker opening state circuit comprises a QF1 opening state circuit and a QF2 opening state circuit. In the QF1 opening state circuit, an intermediate relay K4 normally closed point is connected in series with a high-voltage circuit breaker QF1 normally closed point; in the QF2 opening state circuit, an intermediate relay K1 normally closed point and a high-voltage circuit breaker QF2 normally closed point are connected in series. The QF1 switching state circuit and the QF2 switching state circuit are connected in parallel and then connected into a control module in the high-voltage frequency converter C, when the high-voltage circuit breaker QF2 is disconnected and the isolating switch QS1 is disconnected, the control module in the frequency converter receives feedback of the switching state of the high-voltage circuit breaker QF2, when the high-voltage circuit breaker QF1 is disconnected and the isolating switch QS4 is disconnected, the frequency converter control module receives feedback of the switching state of the high-voltage circuit breaker QF1, and when the feedback of the switching state circuit of the QF1 or the switching state circuit of the QF2 is in the switching state, the frequency converter cannot start the 1# motor or the 2# motor.
The scram trip circuit comprises a QF1 trip circuit and a QF2 trip circuit; in the QF1 trip circuit, a normally open point of an intermediate relay K2 is connected with a normally closed point of a trip intermediate relay K9 in series, and the normally open point is connected into an integrated protection open quantity trip circuit of an integrated protection device in an upper-level high-voltage circuit breaker QF1 in series; when the isolating switch QS2 is closed and the frequency converter sends a tripping signal, the frequency converter trips the high-voltage circuit breaker QF 1. In the QF2 trip circuit, the normally open point of an intermediate relay K5 and the normally closed point of a trip intermediate relay K9 are connected in series and are connected in series into an integrated protection open quantity trip circuit of an integrated protection device in an upper high-voltage circuit breaker QF1, and when an isolating switch QS5 is closed and a frequency converter sends a trip signal, the frequency converter trips a high-voltage circuit breaker QF 2.
The circuit breaker in the high-voltage switch cabinet is provided with a circuit breaker closing/opening loop, and the high-voltage switch cabinet is provided with a comprehensive protection device, which are all the prior art and are well known to those skilled in the art, and are not described herein.
The utility model can realize the following functions:
1. a power distribution loop of a high-voltage circuit breaker QF1 in a 1# switch cabinet and an isolating switch QS3 in a 1# bypass cabinet is a power frequency operation power supply loop of a 1# motor; a power distribution loop of a high-voltage circuit breaker QF2 in a 2# switch cabinet and an isolating switch QS6 in a 2# bypass cabinet is a power frequency operation power supply loop of a 2# motor. In a power frequency operation power supply loop of the 1# motor, the switching-on and switching-off of a high-voltage circuit breaker QF1 in the 1# high-voltage switch cabinet can only control the power frequency starting and stopping of the 1# motor; the switching-on and switching-off of the breaker QF2 in the 2# high-voltage switch cabinet can only control the power-frequency starting and stopping of the 2# motor. And no other power frequency operation power supply loop and control mode exist.
2. A high-voltage circuit breaker QF1 in the 1# switch cabinet, isolating switches (QS 1 and QS 2) in the 1# bypass cabinet and a C power distribution loop of the high-voltage frequency converter are 1# motor variable-frequency operation loops; a high-voltage circuit breaker QF2 in a 2# switch cabinet and a separation switch QS4 and QS5 in a 2# bypass cabinet are variable-frequency operation circuits of which the power distribution circuits are 2# motors. In the variable-frequency operation power supply loop of the 1# motor, when the switching-on and switching-off states of a high-voltage circuit breaker QF1 in a 1# switch cabinet meet the variable-frequency starting and stopping conditions of the 1# motor, the high-voltage frequency converter C can only control the variable-frequency starting and stopping of the 1# motor; in the 2# motor variable-frequency operation power supply loop, when the switching-on and switching-off states of a high-voltage circuit breaker QF2 in a 2# high-voltage switch cabinet of a high-voltage frequency converter C meet the starting and stopping conditions of the 2# motor, the variable-frequency starting and stopping of the 2# motor can be controlled only. And no other variable frequency operation power supply loop and control mode exist.
3. When the 1# motor operates in a variable frequency mode, the high-voltage frequency converter C can only control the high-voltage circuit breaker QF1 in the 1# switch cabinet to suddenly stop and trip, and when the 2# motor operates in a variable frequency mode, the high-voltage frequency converter C can only control the high-voltage circuit breaker QF2 in the 2# switch cabinet to suddenly stop and trip.
In the utility model:
the operation modes of the two high-voltage motors comprise the following modes:
1. the isolating switch QS1 and the isolating switch QS2 are closed, the isolating switch QS3 is opened, and the 1# motor operates in a variable frequency mode;
and an isolating switch QS4 and an isolating switch QS5 are opened, an isolating switch QS6 is closed, and the 2# motor operates at power frequency.
2. The isolating switch QS1 and the isolating switch QS2 are closed, the isolating switch QS3 is opened, and the 1# motor operates in a variable frequency mode;
the isolating switch QS4 and the isolating switch QS5 are opened, the isolating switch QS6 is opened, and the 2# motor does not run.
3. And an isolating switch QS1 and an isolating switch QS2 are opened, an isolating switch QS3 is closed, and the 1# motor operates at power frequency.
And the isolating switch QS4 and the isolating switch QS5 are closed, the isolating switch QS6 is opened, and the 2# motor operates in a frequency conversion mode.
4. And an isolating switch QS1 and an isolating switch QS2 are opened, an isolating switch QS3 is closed, and the 1# motor operates at power frequency.
And an isolating switch QS4 and an isolating switch QS5 are opened, an isolating switch QS6 is closed, and the 2# motor operates at power frequency.
5. And an isolating switch QS1 and an isolating switch QS2 are opened, an isolating switch QS3 is closed, and the 1# motor operates at power frequency.
The isolating switch QS4 and the isolating switch QS5 are opened, the isolating switch QS6 is opened, and the 2# motor does not run.
6. The isolating switch QS1 and the isolating switch QS2 are opened, the isolating switch QS3 is opened, and the 1# motor does not run.
And the isolating switch QS4 and the isolating switch QS5 are closed, the isolating switch QS6 is opened, and the 2# motor operates in a frequency conversion mode.
7. The isolating switch QS1 and the isolating switch QS2 are opened, the isolating switch QS3 is opened, and the 1# motor does not run.
And an isolating switch QS4 and an isolating switch QS5 are opened, an isolating switch QS6 is closed, and the 2# motor operates at power frequency.
During operation, the following points are realized through electrical linkage:
QS1 closes or opens at the same time as QS2, QS3 and QS1/QS2 cannot close at the same time.
QS4 closes or opens at the same time as QS5, QS6 and QS4/QS5 cannot close at the same time.
QS1 and QS4 cannot be closed at the same time, and QS2 and QS5 cannot be closed at the same time.
The system control principle is explained by taking the case that the No. 1 motor runs in a variable frequency mode and the No. 2 motor runs in a power frequency mode as an example; when the 1# motor operates in a variable frequency mode and the 2# motor operates in a power frequency mode, an isolating switch QS1 needs to be closed first, a corresponding isolating switch QS2 is closed, and an isolating switch QS3 is opened; the corresponding isolating switch QS4 is opened, the isolating switch QS5 is opened, the isolating switch QS6 is closed, a closing command signal is sent out through a control module in the high-voltage frequency converter C, the high-voltage circuit breaker QF1 is controlled to be closed after signal selection is carried out through a closing loop of the frequency converter, a circuit breaker closing state feedback signal of the high-voltage circuit breaker QF1 needs to be received within 2-3 seconds after the control module in the high-voltage frequency converter C sends out a circuit breaker closing signal, and the feedback signal is distinguished through a circuit breaker closing state circuit and a circuit breaker opening state circuit in a bypass cabinet; if the frequency converter does not receive a closing feedback signal of the high-voltage circuit breaker QF1 within 2-3 seconds after the closing command signal is sent, the high-voltage frequency converter C sends a frequency converter emergency stop command signal, the relay K9 in the figure 2 loses power, and a normally closed point signal K9 in an emergency stop trip loop in the figure 3 is closed, so that in a fault state, the QF1 emergency stop trip loop is switched on, and the comprehensive protection device receives the signal and controls the high-voltage circuit breaker QF1 to trip until the fault is eliminated. The power frequency running signal is sent by the PLC cabinet remotely, the 2# high-voltage circuit breaker is operated to be closed, and the 2# high-voltage motor runs at the power frequency.
Claims (8)
1. The utility model provides an electric control system of one-drag-two mode of high-voltage inverter bypass wiring which characterized in that includes:
the high-voltage switch cabinet comprises a 1# switch cabinet and a 2# switch cabinet, wherein the 1# switch cabinet is provided with a high-voltage circuit breaker QF1, and the 2# switch cabinet is provided with a high-voltage circuit breaker QF 2;
a high voltage frequency converter C;
the bypass cabinet comprises a 1# bypass cabinet and a 2# bypass cabinet; an isolating switch QS1, an isolating switch QS2 and an isolating switch QS3 are arranged inside the 1# bypass cabinet, and an isolating switch QS4, an isolating switch QS5 and an isolating switch QS6 are arranged inside the 2# bypass cabinet; the isolating switch QS1 is connected with the outlet end of the high-voltage circuit breaker QF1, and the isolating switch QS4 is connected with the outlet end of the high-voltage circuit breaker QF 2; the isolating switch QS1 and the isolating switch QS4 are connected with the input end of the high-voltage frequency converter; an isolating switch QS2 and an isolating switch QS5 are connected with the output end of the high-voltage frequency converter, an isolating switch QS3 is connected between the incoming line end of the isolating switch QS1 and the outgoing line end of the isolating switch QS2, and an isolating switch QS6 is connected between the incoming line end of the isolating switch QS4 and the outgoing line end of the isolating switch QS 5;
the high-voltage motor comprises a 1# motor and a 2# motor; an outlet end of an isolating switch QS2 is connected with the 1# motor, and an outlet end of an isolating switch QS5 is connected with the 2# motor;
the isolating switch QS1 is electrically and mechanically interlocked with an isolating switch QS3, the isolating switch QS4 is electrically and mechanically interlocked with an isolating switch QS6, the isolating switch QS1 is electrically interlocked with an isolating switch QS4, and the isolating switch QS2 is electrically interlocked with an isolating switch QS 5.
2. The electrical control system of one-to-two mode of bypass wiring of high voltage frequency converter as claimed in claim 1, wherein said high voltage frequency converter extension is provided with a closing intermediate relay K7, a breaking intermediate relay K8 and a tripping intermediate relay K9, and isolating switches QS 1-QS 6 extension are provided with corresponding intermediate relays K1-K6; an upper computer on-frequency switching-on/switching-off loop, a frequency converter switching-on loop, a frequency converter switching-off loop, a circuit breaker switching-on state circuit, a circuit breaker switching-off state circuit and an emergency stop tripping loop are formed through wiring.
3. The electrical control system of claim 2, wherein the upper computer power frequency switching on/off circuit comprises a 1# motor power frequency switching on/off control circuit and a 2# motor power frequency switching on/off control circuit; in a power frequency switching-on/switching-off control loop of the No. 1 motor, a PLC controller remotely controls a normally-on point, a normally-on point of an intermediate relay K3, a normally-off point of an intermediate relay K1 and a normally-off point of an intermediate relay K2 to be connected in series and connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF1 in series; in a power frequency switching-on/switching-off control loop of the No. 2 motor, a normally-off point of an intermediate relay K6, a normally-off point of an intermediate relay K4 and a normally-off point of an intermediate relay K5 which are remotely controlled by a PLC are connected in series and are connected into a switching-on/switching-off relay loop of a superior high-voltage circuit breaker QF2 in series.
4. The electrical control system of claim 2, wherein the inverter switching-on circuit comprises a # 1 motor variable-frequency switching-on control circuit and a # 2 motor variable-frequency switching-on control circuit; in the variable-frequency switching-on control circuit of the No. 1 motor, a normally-open point of a switching-on intermediate relay K7, a normally-open point of an intermediate relay K1, a normally-open point of an intermediate relay K2 and a normally-closed point of an intermediate relay K3 are connected in series and are connected into a switching-on relay circuit of an upper high-voltage circuit breaker QF1 in series; in the 2# motor variable frequency switching-on control circuit, a normally-open point of a switching-on intermediate relay K7, a normally-open point of an intermediate relay K4, a normally-open point of an intermediate relay K5 and a normally-closed point of an intermediate relay K6 are connected in series and connected into a switching-on relay circuit of an upper high-voltage circuit breaker QF2 in series.
5. The electrical control system of one-to-two mode of bypass connection of high voltage inverter as claimed in claim 2, wherein said inverter switching-off loop comprises a 1# motor variable frequency switching-off control loop and a 2# motor variable frequency switching-off control loop; in the variable-frequency opening control loop of the No. 1 motor, a normally open point of an opening intermediate relay K8 and a normally open point of an intermediate relay K1 are connected in series and are connected into an opening relay loop of an upper high-voltage circuit breaker QF1 in series; in the variable-frequency opening control loop of the No. 2 motor, a normally open point of an opening intermediate relay K8 and a normally open point of an intermediate relay K4 are connected in series and are connected into an opening relay loop of an upper-level high-voltage circuit breaker QF2 in series.
6. The electrical control system of claim 2, wherein the circuit breaker closing state circuit comprises a QF1 closing state circuit and a QF2 closing state circuit; in a QF1 switching-on state circuit, an intermediate relay K1 normally open point is connected in series with a high-voltage circuit breaker QF1 normally open point; in a QF2 switching-on state circuit, an intermediate relay K4 normally open point is connected in series with a high-voltage circuit breaker QF2 normally open point; the two loops are connected in parallel and then are connected to a control module of the high-voltage frequency converter C.
7. The electrical control system of claim 2, wherein the breaker open-brake state circuit comprises a QF1 open-brake state circuit and a QF2 open-brake state circuit; in the QF1 opening state circuit, an intermediate relay K4 normally closed point is connected in series with a high-voltage circuit breaker QF1 normally closed point; in the QF2 opening state circuit, an intermediate relay K1 normally closed point is connected in series with a high-voltage circuit breaker QF2 normally closed point; the two loops are connected in parallel and then are connected to a control module of the high-voltage frequency converter C.
8. The electrical control system of a high-voltage inverter bypass-wire one-to-two mode as claimed in claim 2, wherein said scram trip circuit comprises a QF1 trip circuit and a QF2 trip circuit; in the QF1 trip circuit, an intermediate relay K2 normally open point and a trip intermediate relay K9 normally closed point are connected in series and are connected in series to a superior high-voltage circuit breaker QF1 comprehensive protection open input trip circuit; in the QF2 trip circuit, an intermediate relay K5 normally open point and a trip intermediate relay K9 normally closed point are connected in series and connected in series to a superior high-voltage circuit breaker QF2 comprehensive protection open amount trip circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121161136.2U CN215344413U (en) | 2021-05-27 | 2021-05-27 | Electrical control system of high-voltage frequency converter bypass wiring one-to-two mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121161136.2U CN215344413U (en) | 2021-05-27 | 2021-05-27 | Electrical control system of high-voltage frequency converter bypass wiring one-to-two mode |
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| CN215344413U true CN215344413U (en) | 2021-12-28 |
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| CN202121161136.2U Active CN215344413U (en) | 2021-05-27 | 2021-05-27 | Electrical control system of high-voltage frequency converter bypass wiring one-to-two mode |
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