Electrical control circuit of main motor of circulating ropeway driven by diesel generator

Abstract

The present invention discloses an electrical control circuit for the main motor of a diesel generator-driven circulating ropeway, belonging to the fields of diesel generator technology and passenger ropeway motor traction. The circuit includes a three-phase intelligent monitoring phase loss, an over- and undervoltage relay KC1 (referred to as a three-phase power supply relay), and an inverter INV output voltage UV. The L1, L2, and L3 terminals of the over- and undervoltage relay KC1 are connected to fuses FU5, FU6, and FU7, respectively. The present invention utilizes the free-stop function inherent in the Siemens four-quadrant S150 inverter INV and the emergency stop circuit. In free-stop mode, the S150 inverter does not actively apply electrical braking but generates feedback energy, effectively protecting the cableway diesel generator and main electronic control. When adopting this new control technology, the operating status of the electronic control must be monitored. When electrical braking occurs under normal operating conditions (including parking, peripheral equipment safety protection, and main engine failure), and when braking power is generated, real-time online monitoring is performed.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel generators, and more particularly to an electrical control circuit for a main motor of a circulating ropeway driven by a diesel generator. Background Art

[0002] The new cableway specification requires that the main control component of the cableway be a four-quadrant frequency converter or a four-quadrant DC speed regulator. The four-quadrant drive product is an energy-saving product for the electrical industry. Its function is to return the energy fed back during electrical braking to the grid under normal operation. It can not only use electricity, but also reverse power to the grid. When the cableway malfunctions or is electrically stopped, the electrical braking generates huge amounts of energy that needs to be fed back to the grid. The frequency converter or DC speed regulator achieves the task of energy-saving driving and feedback energy transmission. Diesel generators replace the mains power supply for driving, using a diesel generator with a rated power 3-5 times that of the main motor. The motor speed and load must be strictly controlled to limit the amount of power it can feedback. The current working condition is that the energy fed back to the grid becomes the diesel generator itself. This is a very dangerous practice. First, the diesel generator receives a large impact from the feedback energy, and the energy is uncontrollable as the load changes, posing a significant safety risk to the diesel generator, electronic control components, and frequency converter (DC speed regulator). Due to the high power of the cableway equipment, severe conditions can cause the cableway electronic control, diesel generator, and frequency converter to burn out, resulting in huge losses of millions.

[0003] If a two-quadrant frequency converter is used for a cableway built under the old specifications, the frequency converter will not feed back energy to the grid. When the cableway fails or stops electrically, the inverter's reverse energy will accumulate on its DC bus, causing the DC bus voltage to rise. The frequency converter braking unit (brake chopper) is connected to an external metal resistor, and energy consumption braking is adopted to consume energy through the resistor. When the cableway is in an empty state, the frequency converter will brake through the braking unit to maintain a stable speed, and the braking energy will be consumed by heating the resistor. If it is towed by a diesel generator, when When the inverter is in the no-load condition, it is already in the braking process and suddenly stops electrically. At this time, the inverter undergoes electrical braking and triggers huge braking energy to the DC bus. Under normal circumstances, the energy is consumed by the metal resistor on the inverter braking unit. When the resistance reaches its limit, it is burned, which further causes the inverter energy to be unable to be consumed and burn out. In addition, this solution is a non-energy-saving variable frequency driving method. The new specification no longer allows the use of two-quadrant inverters, and it is rare to see diesel generators driving two-quadrant inverters in actual applications.

[0004] At the same time, the existing cableway main motor electrical control circuit cannot provide good protection for the power direction. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] In response to the problems existing in the prior art, the purpose of the present invention is to provide an electrical control circuit for the main motor of a circulating cableway dragged by a diesel generator. The present invention utilizes the free parking function of the emergency stop working function of the frequency converter INV. In the free parking mode, the frequency converter INV will not actively brake and generate feedback energy, thereby achieving effective protection for the cableway diesel generator and the main electronic control. When adopting this new control technology, it is necessary to monitor the operating status of the electronic control in real time. When electrical braking is performed during a fault or manual parking, when braking power is generated, the protection circuit quickly and accurately judges it (in milliseconds) and effectively controls it, adopts the free parking mode, and makes the cableway stop safely to meet the requirements of safe dragging of the diesel generator. At the same time, the present invention facilitates the realization of good monitoring and protection control of the power direction.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the present invention adopts the following technical solutions:

[0009] The electrical control circuit of the main motor of the diesel generator-driven circular ropeway includes a three-phase intelligent monitoring phase loss, an over-voltage and under-voltage relay KC1, and an inverter INV. The L1, L2, and L3 terminals of the over-voltage and under-voltage relay KC1 are respectively connected to fuses FU5, FU6, and FU7, and the L1, L2, and L3 terminals of the over-voltage and under-voltage relay KC1 are all connected to a voltmeter PV. It is characterized by also including:

[0010] a power direction detection circuit, wherein an input end of the power direction detection circuit is connected to output ends of fuse FU6 and fuse FU7;

[0011] An emergency stop circuit, the emergency stop circuit being connected to a control emergency stop circuit of the frequency converter INV;

[0012] A power detection protection circuit, the input end of which is connected to the output end of the emergency stop circuit, and is used to control the loop power supply in real time;

[0013] a power direction protection circuit, wherein the input end of the power direction protection circuit is connected to the input end of the power detection protection circuit, wherein the power direction protection circuit includes a circuit breaker QF3, a normally open switch of a power direction relay JJ, and a coil of a time relay KT2, the input end of the circuit breaker QF3 is connected to the input end of the normally open switch of the power direction relay JJ, the circuit breaker QF3, the normally open switch of the power direction relay JJ, and the coil of the time relay KT2 are connected in series in sequence, and the output end of the coil of the time relay KT2 is connected to the L-terminal of the control loop DC power supply PW1; and

[0014] The present invention utilizes the free-stop function of the frequency converter INV and the emergency stop circuit. After the frequency converter stops suddenly, the frequency converter INV will not actively brake to generate feedback energy in the free-stop mode, thereby effectively protecting the cableway diesel generator and the main electronic control. When adopting this new control technology, it is necessary to monitor the operating status of the electronic control. When electrical braking occurs and braking power is generated, it can be effectively controlled after accurate judgment, and the free-stop mode can be adopted to stop the cableway safely and meet the safe towing of the diesel generator. At the same time, the present invention facilitates the realization of good protection of the power direction.

[0015] As a preferred solution of the present invention, the power direction detection circuit includes a current transformer TAa, an ammeter PA, a circuit breaker QF1, a fuse FU1, a fuse FU2, a fuse FU3 and a fuse FU4. Two circuit breakers QF1 are provided, and the input ends of the two circuit breakers QF1 are respectively connected to the output end of the fuse FU6 and the output end of the fuse FU7. The current transformer TAa is mutually inductive with the fuse FU7, and the ammeter PA is arranged on the current transformer TAa.

[0016] As a preferred solution of the present invention, the control power supply circuit includes a circuit breaker QF5, a coil of a contactor KM1, and a normally open switch of a three-phase power supply relay KC2. The L2 end of the overvoltage / undervoltage relay KC1 is respectively connected to the input end of the circuit breaker QF5 and the input end of the normally open switch of the three-phase power supply relay KC2. The output end of the circuit breaker QF5 and the output end of the normally open switch of the three-phase power supply relay KC2 are both connected to the input end of the coil of the contactor KM1, and the output end of the coil of the contactor KM1 is connected to the L3 end of the overvoltage / undervoltage relay KC1.

[0017] As a preferred embodiment of the present invention, the emergency stop circuit includes a circuit breaker QF2, a coil of a differential relay KD4, a switch SB1-1, a switch SB2-2, a switch SA1, a normally open switch of a time relay KT1, an indicator light HL1, an indicator light HL5, an indicator light HL2, an indicator light HL6 and a coil of a time relay KT3. The L+ end of the control loop DC power supply PW1 is respectively connected to the input end of the coil of the differential relay KD4 and the input end of the circuit breaker QF2. The output end of the circuit breaker QF2 is respectively connected to the input end of the switch SB1-1, the input end of the indicator light HL1 and the input end of the indicator light HL5. The output end of the switch SB1-1 is connected to the input end of the circuit breaker QF2. It is connected to the input end of switch SB2-2, the output end of the switch SB2-2 is connected to the input end of switch SA1, the output end of the switch SA1 is respectively connected to the input end of the normally open switch of the time relay KT1, the input end of the indicator light HL2 and the input end of the indicator light HL6, the output end of the normally open switch of the time relay KT1 is connected to the input end of the coil of the time relay KT3, the output end of the circuit breaker QF2, the output end of the indicator light HL1, the output end of the indicator light HL5, the output end of the coil of the time relay KT3, the output end of the indicator light HL2 and the output end of the indicator light HL6 are all connected to the L-end of the control loop DC power supply PW1.

[0018] As a preferred solution of the present invention, the power supply detection protection circuit includes an indicator light HL3 and an indicator light HL7, the output end of the switch SB1-1 is respectively connected to the input end of the normally open switch of the time relay KT3 and the input end of the normally open switch of the over / undervoltage relay KC1, the output end of the normally open switch of the time relay KT3 is connected to the input end of the circuit breaker QF3, the output end of the normally open switch of the over / undervoltage relay KC1 is respectively connected to the input end of the coil of the time relay KT1, the input end of the indicator light HL3 and the input end of the indicator light HL7, the output end of the coil of the time relay KT1, the output end of the indicator light HL3 and the output end of the indicator light HL7 are all connected to the L-end of the control loop DC power supply PW1.

[0019] As a preferred embodiment of the present invention, the fault circuit includes a normally open switch of the differential relay KD1, a normally open switch of the differential relay KD2, a switch JT, an indicator light HLA, an indicator light HL8 and a coil of the fault relay JT. The output end of the switch SB2-1 is also respectively connected to the input end of the normally open switch of the differential relay KD1, the input end of the normally closed switch of the overvoltage / undervoltage relay KC1, the input end of the normally open switch of the time relay KT2, the input end of the switch JT and the input end of the normally open switch of the differential relay KD2. The output end of the normally open switch of the differential relay KD1, the output end of the normally closed switch of the over / under voltage relay KC1, the output end of the normally open switch of the time relay KT2, the output end of the switch JT and the output end of the normally open switch of the differential relay KD2 are all connected to the input end of the indicator light HL4, the input end of the indicator light HL8 and the input end of the coil of the fault relay JT. The output end of the indicator light HL4, the output end of the indicator light HL8 and the output end of the coil of the fault relay JT are all connected to the L-terminal of the control circuit DC power supply PW1.

[0020] As a preferred embodiment of the present invention, it also includes:

[0021] A frequency converter output voltage detection circuit, wherein the input end of the frequency converter output voltage detection circuit is connected to the input end of the relay KD4; and

[0022] The stall protection circuit has an input end connected to the output end of the inverter output voltage detection circuit.

[0023] As a preferred embodiment of the present invention, the inverter output voltage detection circuit includes a Hall sensor HTIB and an intelligent voltage controller WPx. The L+ and L-terminals of the DC control power supply PW1 are connected to the power supply terminal, the 5th and 6th pins of the chip HTIB are connected to the power supply terminal, and the 1st and 4th pins of the chip HTIB are both connected to the output terminal of the differential relay KD4. The input signal is isolated at the breakpoint to reduce the protection of the Hall sensor input terminal from the lack of voltage signal when the electronic control is not in use.

[0024] As a preferred embodiment of the present invention, the stall protection circuit includes a DC 4-20mA one-to-two transmission signal WP9044 transmitter and an intelligent voltage controller WPy. The output transmission end of the Hall sensor HTIB is connected to the transmission signal input end of the one-to-two transmission signal WP9044 transmitter, the transmission signal monitoring input end of the intelligent voltage controller WPx is connected to the transmission output 1 channel of the transmission one-to-two sensor, the transmission output 2 channel of the one-to-two transmission signal WP9044 is connected to the transmission signal monitoring input end, the 14th pin and the 13th pin of the one-to-two transmission signal WP9044 are respectively connected to the L+ end and the L﹣ end of the DC control power supply, and the 10th pin and the 9th pin of the intelligent voltage controller WPy are respectively connected to the L+ end and the L﹣ end of the DC control power supply PW1.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] (1) The present invention facilitates good monitoring and protection control of the power direction by setting up a power direction protection circuit.

[0028] (2) The present invention utilizes the free-stop function of the frequency converter INV and the emergency stop circuit. In the free-stop mode, the frequency converter INV and the emergency stop circuit will not actively brake and generate feedback energy, thereby achieving effective protection for the cableway diesel generator and the main electronic control. When adopting this new control technology, it is necessary to conduct real-time online monitoring of the electronic control operation status. The intelligent voltage controllers WPx and WPy perform dual-channel monitoring to ensure the reliability of redundant comparative protection. It can achieve comparative protection against control power loss, Hall sensor failure, failure of the WP9044 transmitter that transmits the one-to-two signal, and damage to any of the WPx and WPy controllers. When the cableway is electrically braked and braking power is generated, it accurately judges and effectively controls it to execute, allowing the frequency converter to enter a free-stop mode, so that the cableway stops safely and the diesel generator is safely towed.

[0029] (3) The present invention controls the power supply by controlling the power supply circuit.

[0030] (4) The present invention detects and protects the power supply through a power supply detection and protection circuit.

[0031] (5) The present invention realizes fault detection through a fault circuit.

[0032] (6) The present invention realizes stall protection through the inverter output voltage detection circuit, power supply detection and protection of the over-voltage and under-voltage relay KC1, and the stall protection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a circuit schematic diagram of the electrical control circuit of the main motor of the circulating ropeway driven by the diesel generator of the present invention;

[0034] Figure 2 This is a circuit schematic diagram of a power direction detection circuit in an electrical control circuit of a main motor of a circulating ropeway driven by a diesel generator according to the present invention;

[0035] Figure 3 This is a circuit schematic diagram of the control power supply circuit in the electrical control circuit of the main motor of the diesel generator-driven circulating ropeway of the present invention;

[0036] Figure 4 This is a circuit schematic diagram of the emergency stop circuit in the electrical control circuit of the main motor of the diesel generator-driven circulating ropeway of the present invention;

[0037] Figure 5 This is a circuit schematic diagram of the power supply detection and protection circuit in the electrical control circuit of the main motor of the diesel generator-driven circulating ropeway of the present invention;

[0038] Figure 6 This is a circuit schematic diagram of a power direction protection circuit in an electrical control circuit of a main motor of a circulating ropeway driven by a diesel generator according to the present invention;

[0039] Figure 7 This is a circuit schematic diagram of a fault circuit in an electrical control circuit of a main motor of a circulating ropeway driven by a diesel generator according to the present invention;

[0040] Figure 8 This is a circuit schematic diagram of the frequency converter INV in the electrical control circuit of the main motor of the circulating ropeway driven by the diesel generator of the present invention;

[0041] Figure 9 This is a circuit schematic diagram of a frequency converter output power detection circuit and a stall protection circuit in an electrical control circuit of a main motor of a diesel generator-driven circulating ropeway according to the present invention;

[0042] Figure 10 This is a partial circuit schematic diagram of the electrical control circuit of the main motor of the circulating ropeway driven by the diesel generator of the present invention.

[0043] Description of the numbers in the figure:

[0044] 1. Power direction detection circuit; 2. Control power supply circuit; 3. Emergency stop circuit; 4. Power supply detection protection circuit; 5. Power direction protection circuit; 6. Fault circuit; 7. Inverter output voltage detection circuit; 8. Stall protection circuit. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0048] Example:

[0049] See also Figure 1-10 , the electrical control circuit of the main motor of the diesel generator-driven circular ropeway includes:

[0050] Three-phase intelligent monitoring of phase loss, over- and under-voltage relay KC1 and inverter INV. The L1, L2 and L3 terminals of the over- and under-voltage relay KC1 are connected to fuses FU5, FU6 and FU7 respectively, and the L1, L2 and L3 terminals of the over- and under-voltage relay KC1 are all connected to a voltmeter PV.

[0051] A power direction detection circuit 1, wherein the input end of the power direction detection circuit 1 is connected to the output end of fuse FU6 and fuse FU7. Specifically, the power direction detection circuit 1 includes a current transformer TAa, an ammeter PA, a circuit breaker QF1, fuse FU1, fuse FU2, fuse FU3, and fuse FU4. Two circuit breakers QF1 are provided, and the input ends of the two circuit breakers QF1 are respectively connected to the output end of fuse FU6 and the output end of fuse FU7. The current transformer TAa and the fuse FU7 are mutually inductive, and the ammeter PA is provided on the current transformer TAa. This is common knowledge among those skilled in the art and will not be described in detail herein.

[0052] Control power supply circuit 2, the input end of control power supply circuit 2 is connected to L1 end of over-voltage / under-voltage relay KC1, specifically: control power supply circuit 2 includes circuit breaker QF5, the coil of contactor KM1, and the normally open switch of three-phase power supply relay KC2, L2 end of over-voltage / under-voltage relay KC1 is respectively connected to the input end of circuit breaker QF5 and the input end of normally open switch of three-phase power supply relay KC2, the output end of circuit breaker QF5 and the output end of normally open switch of three-phase power supply relay KC2 are both connected to the input end of coil of contactor KM1, the output end of coil of contactor KM1 is connected to L3 end of over-voltage / under-voltage relay KC1, and power supply is controlled by control power supply circuit 2;

[0053] Emergency stop circuit 3, emergency stop circuit 3 is connected to the DC control power supply PW1, specifically: the emergency stop circuit 3 includes the circuit breaker QF2, the coil of the differential relay KD4, the switch SB1-1, the switch SB2-2, the switch SA1, the normally open switch of the time relay KT1, the indicator light HL1, the indicator light HL5, the indicator light HL2, the indicator light HL6 and the coil of the time relay KT3, the L+ end of the control loop DC power supply PW1 is respectively connected to the input end of the coil of the differential relay KD4 and the input end of the circuit breaker QF2, the output end of the circuit breaker QF2 is respectively connected to the input end of the switch SB1-1, the input end of the indicator light HL1 and the input end of the indicator light HL5, the output end of the switch SB1-1 is connected to the switch The input end of switch SB2-2 is connected, the output end of switch SB2-2 is connected to the input end of switch SA1, the output end of switch SA1 is respectively connected to the input end of the normally open switch of time relay KT1, the input end of indicator light HL2, and the input end of indicator light HL6, the output end of the normally open switch of time relay KT1 is connected to the input end of the coil of time relay KT3, the output end of circuit breaker QF2, the output end of indicator light HL1, the output end of indicator light HL5, the output end of the coil of time relay KT3, the output end of indicator light HL2, and the output end of indicator light HL6 are all connected to the L-terminal of control loop DC power supply PW1, and the power supply is detected and protected by power supply detection and protection circuit 4;

[0054] A power supply detection protection circuit 4, wherein the input end of the power supply detection protection circuit 4 is connected to the output end of the emergency stop circuit 3. Specifically, the power supply detection protection circuit 4 includes an indicator light HL3 and an indicator light HL7. The output end of the switch SB1-1 is respectively connected to the input end of the normally open switch of the time relay KT3 and the input end of the normally open switch of the over / undervoltage relay KC1. The output end of the normally open switch of the time relay KT3 is connected to the input end of the circuit breaker QF3. The output end of the normally open switch of the over / undervoltage relay KC1 is respectively connected to the input end of the coil of the time relay KT1, the input end of the indicator light HL3, and the input end of the indicator light HL7. The output end of the coil of the time relay KT1, the output end of the indicator light HL3, and the output end of the indicator light HL7 are all connected to the L-terminal of the control loop DC power supply PW1.

[0055] A power direction protection circuit 5, wherein the input end of the power direction protection circuit 5 is connected to the input end of the power detection protection circuit 4, wherein the power direction protection circuit 5 includes a circuit breaker QF3, a normally open switch of a power direction relay JJ, and a coil of a time relay KT2. The input end of the circuit breaker QF3 is connected to the input end of the normally open switch of the power direction relay JJ. The circuit breaker QF3, the normally open switch of the power direction relay JJ, and the coil of the time relay KT2 are connected in series in sequence. The output end of the coil of the time relay KT2 is connected to the L-terminal of the control loop DC power supply PW1;

[0056] Fault circuit 6, the input end of the fault circuit 6 is connected to the output end of the power direction protection circuit 5. Specifically: the fault circuit 6 includes the normally open switch of the differential relay KD1, the normally open switch of the differential relay KD2, the switch JT, the indicator light HLA, the indicator light HL8 and the coil of the fault relay JT. The output end of the switch SB2-1 is also respectively connected to the input end of the normally open switch of the differential relay KD1, the input end of the normally closed switch of the over-voltage and under-voltage relay KC1, the input end of the normally open switch of the time relay KT2, the input end of the switch JT and the normally closed switch of the differential relay KD2. The input end of the open switch is connected, the output end of the normally open switch of the differential relay KD1, the output end of the normally closed switch of the over / under voltage relay KC1, the output end of the normally open switch of the time relay KT2, the output end of the switch JT, and the output end of the normally open switch of the differential relay KD2 are all connected to the input end of the indicator light HL4, the input end of the indicator light HL8, and the input end of the coil of the fault relay JT, and the output end of the indicator light HL4, the output end of the indicator light HL8, and the output end of the coil of the fault relay JT are all connected to the L-terminal of the control loop DC power supply PW1;

[0057] The inverter output voltage detection circuit 7 has an input end connected to the input end of KD4. Specifically, the inverter output voltage detection circuit 7 includes a Hall sensor HTIB and an intelligent voltage controller WPx. The L+ and L-terminals of the DC control power supply PW1 are connected to the power supply end. Pins 5 and 6 of the chip HTIB are connected to the power supply end. Pins 1 and 4 of the chip HTIB are both connected to the output end of the differential relay KD4. The power supply detection and protection of the inverter output voltage circuit 7 contactor KM1 are used to implement stall protection through the stall protection circuit 8.

[0058] Stall protection circuit 8, the input end of the stall protection circuit 8 is connected to the output end of the inverter output power detection circuit 7, specifically: the stall protection circuit 8 includes a DC 4-20mA one-to-two transmission signal WP9044 transmitter and an intelligent voltage controller WPy, the output transmission end of the Hall sensor HTIB is connected to the transmission signal input end of the one-to-two transmission signal WP9044 transmitter, the transmission signal monitoring input end of the intelligent voltage controller WPx is connected to the transmission output 1 channel of the transmission one-to-two sensor, the transmission output 2 channel of the one-to-two transmission signal WP9044 is connected to the transmission signal monitoring input end, the 14th pin and the 13th pin of the one-to-two transmission signal WP9044 are respectively connected to the L+ end and the L-end of the DC control power supply, and the 10th pin and the 9th pin of the intelligent voltage controller WPy are respectively connected to the L+ end and the L-end of the DC control power supply PW1;

[0059] The working principle or working process of the present invention is as follows: the present invention utilizes the free stop function of the frequency converter INV and the emergency stop circuit 3. In the free stop mode, the frequency converter INV and the emergency stop circuit 3 will not actively brake to avoid generating feedback energy, thereby achieving effective protection for the cableway diesel generator and the main electronic control. When adopting this new control technology, it is necessary to accurately monitor the operating status of the cableway main engine. When electrical braking occurs and braking power is generated, it is effectively controlled after accurate judgment, and a free stop mode is adopted to stop the cableway safely, meeting the safe towing of the diesel generator and the protection of the frequency converter and the main electronic control, achieving a technical breakthrough, and changing the current domestic cableway conventional practice of relying on energy-consuming braking to consume braking power through resistance heating. The heat energy of the heating resistor is consumed in the air, so it has a certain effect and contribution in energy saving and environmental protection.

[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, and these changes should be covered by the scope of protection of the present invention.

Claims

1. The electrical control circuit of the main motor of the diesel generator-driven circular ropeway includes a three-phase intelligent monitoring phase loss, an overvoltage and undervoltage relay KC1, and an inverter INV. The L1, L2, and L3 terminals of the overvoltage and undervoltage relay KC1 are respectively connected to fuses FU5, FU6, and FU7. The L1, L2, and L3 terminals of the overvoltage and undervoltage relay KC1 are also connected to a voltmeter PV. The following features are present: Also includes: A power direction detection circuit (1), wherein an input end of the power direction detection circuit (1) is connected to output ends of fuse FU6 and fuse FU7; An emergency stop circuit (3), the emergency stop circuit (3) being connected to a control emergency stop circuit of the frequency converter INV; A power detection protection circuit (4), the input end of the power detection protection circuit (4) is connected to the output end of the emergency stop circuit (3), and is used for real-time control of the loop power supply; A power direction protection circuit (5), wherein the input end of the power direction protection circuit (5) is connected to the input end of the power detection protection circuit (4), wherein the power direction protection circuit (5) includes a circuit breaker QF3, a normally open switch of a power direction relay JJ, and a coil of a time relay KT2, the input end of the circuit breaker QF3 is connected to the input end of the normally open switch of the power direction relay JJ, the circuit breaker QF3, the normally open switch of the power direction relay JJ, and the coil of the time relay KT2 are sequentially connected in series, and the output end of the coil of the time relay KT2 is connected to the L-terminal of the control loop DC power supply PW1; and A fault circuit (6), wherein the input end of the fault circuit (6) is connected to the output end of the power direction protection circuit (5).

2. The electrical control circuit of the main motor of the diesel generator-driven circular ropeway according to claim 1, wherein the power direction detection circuit (1) comprises a current transformer TAa, an ammeter PA, a circuit breaker QF1, a fuse FU1, a fuse FU2, a fuse FU3 and a fuse FU4, two circuit breakers QF1 are provided, the input ends of the two circuit breakers QF1 are respectively connected to the output ends of the fuse FU6 and the output ends of the fuse FU7, the current transformer TAa and the fuse FU7 are mutually inductive, and the ammeter PA is provided on the current transformer TAa.

3. The electrical control circuit of the main motor of the diesel generator-driven circular ropeway according to claim 2, wherein the control power supply circuit (2) includes a circuit breaker QF5, a coil of a contactor KM1, and a normally open switch of a three-phase power supply relay KC2, the L2 end of the overvoltage / undervoltage relay KC1 is respectively connected to the input end of the circuit breaker QF5 and the input end of the normally open switch of the three-phase power supply relay KC2, the output end of the circuit breaker QF5 and the output end of the normally open switch of the three-phase power supply relay KC2 are both connected to the input end of the coil of the contactor KM1, and the output end of the coil of the contactor KM1 is connected to the L3 end of the overvoltage / undervoltage relay KC1.

4. The electrical control circuit of the main motor of the diesel generator-driven circular ropeway according to claim 3, wherein the emergency stop circuit (3) comprises a circuit breaker QF2, a coil of a differential relay KD4, a switch SB1-1, a switch SB2-2, a switch SA1, a normally open switch of a time relay KT1, an indicator light HL1, an indicator light HL5, an indicator light HL2, an indicator light HL6 and a coil of a time relay KT3, an L+ end of a control loop DC power supply PW1 is connected to an input end of the coil of the differential relay KD4 and an input end of the circuit breaker QF2, an output end of the circuit breaker QF2 is connected to an input end of the switch SB1-1, an input end of the indicator light HL1 and an input end of the indicator light HL5, and the The output end of the switch SB1-1 is connected to the input end of the switch SB2-2, the output end of the switch SB2-2 is connected to the input end of the switch SA1, the output end of the switch SA1 is respectively connected to the input end of the normally open switch of the time relay KT1, the input end of the indicator light HL2 and the input end of the indicator light HL6, the output end of the normally open switch of the time relay KT1 is connected to the input end of the coil of the time relay KT3, the output end of the circuit breaker QF2, the output end of the indicator light HL1, the output end of the indicator light HL5, the output end of the coil of the time relay KT3, the output end of the indicator light HL2 and the output end of the indicator light HL6 are all connected to the L-end of the control loop DC power supply PW1.

5. According to the electrical control circuit of the main motor of the diesel generator-driven circular ropeway according to claim 4, the power supply detection protection circuit (4) includes an indicator light HL3 and an indicator light HL7, the output end of the switch SB1-1 is respectively connected to the input end of the normally open switch of the time relay KT3 and the input end of the normally open switch of the over / undervoltage relay KC1, the output end of the normally open switch of the time relay KT3 is connected to the input end of the circuit breaker QF3, the output end of the normally open switch of the over / undervoltage relay KC1 is respectively connected to the input end of the coil of the time relay KT1, the input end of the indicator light HL3 and the input end of the indicator light HL7, the output end of the coil of the time relay KT1, the output end of the indicator light HL3 and the output end of the indicator light HL7 are all connected to the L-end of the control loop DC power supply PW1.

6. The electrical control circuit of the main motor of the diesel generator-driven circular ropeway according to claim 5, wherein the fault circuit (6) comprises a normally open switch of the differential relay KD1, a normally open switch of the differential relay KD2, a switch JT, an indicator light HLA, an indicator light HL8 and a coil of the fault relay JT, and the output end of the switch SB2-1 is also respectively connected to the input end of the normally open switch of the differential relay KD1, the input end of the normally closed switch of the over-voltage and under-voltage relay KC1, the input end of the normally open switch of the time relay KT2, the input end of the switch JT and the normally closed switch of the differential relay KD2. The input end of the normally open switch is connected, the output end of the normally open switch of the differential relay KD1, the output end of the normally closed switch of the over / under voltage relay KC1, the output end of the normally open switch of the time relay KT2, the output end of the switch JT and the output end of the normally open switch of the differential relay KD2 are all connected to the input end of the indicator light HL4, the input end of the indicator light HL8 and the input end of the coil of the fault relay JT, and the output end of the indicator light HL4, the output end of the indicator light HL8 and the output end of the coil of the fault relay JT are all connected to the L-terminal of the control loop DC power supply PW1.

7. The diesel generator driven circulating ropeway main motor electrical control circuit according to claim 6 is characterized in that: Also includes: A frequency converter output voltage detection circuit (7), wherein an input end of the frequency converter output voltage detection circuit (7) is connected to an input end of the relay KD4; as well as A stall protection circuit (8) has an input end connected to an output end of a frequency converter output voltage detection circuit (7).

8. The diesel generator driven circulating ropeway main motor electrical control circuit according to claim 7 is characterized in that: The inverter output voltage detection circuit (7) includes a Hall sensor HTIB and an intelligent voltage controller WPx. The L+ terminal and L-terminal of the DC control power supply PW1 are connected to the power supply terminal. The 5th pin and the 6th pin of the chip HTIB are connected to the power supply terminal. The 1st pin and the 4th pin of the chip HTIB are both connected to the output terminal of the differential relay KD4.

9. The diesel generator driven circulating ropeway main motor electrical control circuit according to claim 8, characterized in that: The stall protection circuit (8) comprises a DC 4-20mA one-to-two transmission signal WP9044 transmitter and an intelligent voltage controller WPy, wherein the output transmission end of the Hall sensor HTIB is connected to the transmission signal input end of the one-to-two transmission signal WP9044 transmitter, the transmission signal monitoring input end of the intelligent voltage controller WPx is connected to the transmission output 1 channel of the transmission one-to-two sensor, the transmission output 2 channel of the one-to-two transmission signal WP9044 is connected to the transmission signal monitoring input end, the 14th pin and the 13th pin of the one-to-two transmission signal WP9044 are respectively connected to the L+ end and the L﹣ end of the DC control power supply, and the 10th pin and the 9th pin of the intelligent voltage controller WPy are respectively connected to the L+ end and the L﹣ end of the DC control power supply PW1.

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