A phase failure protection device for a trolley slide wire

Abstract

The utility model relates to a kind of travelling crane sliding contact line open-phase protection device, including first phase sequence protector and first circuit breaker;The first input end of first circuit breaker is connected with the L1 phase of power supply bus, the second input end of first circuit breaker is connected with the L2 phase of power supply bus, the third input end of first circuit breaker is connected with the L3 phase of power supply bus, and the first output end, second output end and third output end of first circuit breaker are respectively connected with the stroke load of travelling crane;Three first phase sequence input ends of first phase sequence protector are respectively connected with the three-phase of stroke load, one end of first normally open contact is connected with power supply bus, the other end of first normally open contact is connected with one end of cutout coil of first circuit breaker, and the other end of cutout coil of first circuit breaker is grounded;The utility model can cut off the power supply of stroke load in time when overvoltage, undervoltage and three-phase unbalance etc. Condition, ensure that sliding line is not electrified after falling, guarantee personal and property safety.

Description

Technical Field

[0001] This utility model relates to the field of vehicle power supply control technology, specifically to a vehicle sliding contact line phase failure protection device. Background Technology

[0002] Because outdoor vehicles contain inductive and capacitive devices (such as frequency converters), if the power supply switch is equipped with a residual current device (RCD), it may trip unexpectedly. Without an RCD, if the discharge current between the live wire and ground is insufficient, the circuit breaker will not trip and will not provide protection. However, during operation, various unexpected situations can cause malfunctions, such as excessive wear of pulleys, loosening or detachment of the conductor rail bracket, excessive vibration from the vehicle, or strong winds, causing the conductor rail to break and fall to the ground or metal frame. In such cases, because the circuit breaker lacks RCD protection, it will not trip to cut off the circuit, leaving the line energized and posing a risk of electric shock. Utility Model Content

[0003] In order to solve the technical problems in the prior art, such as the inability to cut off the power supply line in time when the overhead contact line breaks and falls, which brings about safety risks, this utility model provides an overhead contact line phase failure protection device.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A traveling crane sliding contact line phase failure protection device includes a first phase sequence protector and a first circuit breaker. The first circuit breaker includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The first input terminal of the first circuit breaker is connected to phase L1 of the power supply bus via a first power supply cable. The second input terminal of the first circuit breaker is connected to phase L2 of the power supply bus via a second power supply cable. The third input terminal of the first circuit breaker is connected to phase L3 of the power supply bus via a third power supply cable. The first, second, and third output terminals of the first circuit breaker are respectively connected to the travel load of the traveling crane.

[0006] The first phase sequence protector includes three first phase sequence input terminals and a first normally open contact. The three first phase sequence input terminals are respectively connected to the first power supply cable, the second power supply cable and the third power supply cable. One end of the first normally open contact is connected to the power supply bus, and the other end of the first normally open contact is connected to one end of the cutting coil of the first circuit breaker. The other end of the cutting coil of the first circuit breaker is grounded.

[0007] The beneficial effects of this utility model are as follows: By setting a first phase sequence protector and a first circuit breaker, when the sliding line of the trolley breaks and falls, the power supply to the travel load becomes disordered in phase sequence. The normally open contact of the first phase sequence protector is connected, the cutting coil of the first circuit breaker is energized, and the first circuit breaker cuts off the power supply to the travel load. It effectively monitors abnormal conditions such as overvoltage, undervoltage, and three-phase imbalance of the power supply to the travel load, and cuts off the power supply to the travel load in time when overvoltage, undervoltage, and three-phase imbalance occur, ensuring that the sliding line is not energized after falling, thus ensuring personal and property safety.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, it also includes a second phase sequence protector and a second circuit breaker. The second circuit breaker includes a fourth input terminal, a fifth input terminal, a sixth input terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal. The fourth input terminal of the second circuit breaker is connected to phase L1 of the power supply bus via a fourth power supply cable. The fifth input terminal of the second circuit breaker is connected to phase L2 of the power supply bus via a fifth power supply cable. The sixth input terminal of the second circuit breaker is connected to phase L3 of the power supply bus via a sixth power supply cable. The fourth, fifth, and sixth output terminals of the second circuit breaker are respectively connected to the lifting load of the crane.

[0010] The second phase sequence protector includes three second phase sequence input terminals and a second normally open contact. The three second phase sequence input terminals are respectively connected to the fourth power supply cable, the fifth power supply cable and the sixth power supply cable. One end of the second normally open contact is connected to the power supply bus, and the other end of the second normally open contact is connected to one end of the cutting coil of the second circuit breaker. The other end of the cutting coil of the second circuit breaker is grounded.

[0011] The beneficial effect of adopting the above-mentioned further solution is that, by setting up a second phase sequence protector and a second circuit breaker, when the trolley's sliding line breaks and falls, the power supply to the load becomes disordered in phase sequence. The normally open contact of the second phase sequence protector is closed, the cutting coil of the second circuit breaker is energized, and the second circuit breaker cuts off the power supply to the lifting load. This effectively monitors abnormal conditions such as overvoltage, undervoltage, and three-phase imbalance in the power supply to the lifting load, and promptly cuts off the power supply to the lifting load when overvoltage, undervoltage, or three-phase imbalance occurs, further improving the power supply safety performance.

[0012] Furthermore, one end of the cutting coil of the first circuit breaker is connected to one end of the cutting coil of the second circuit breaker via a wire.

[0013] The beneficial effect of adopting the above-mentioned further solution is that by electrically connecting one end of the cutting coil of the first circuit breaker to one end of the cutting coil of the second circuit breaker with a wire, when either the power supply to the travel load or the power supply to the hoisting load experiences overvoltage, undervoltage, or three-phase imbalance, the power supply to the travel load and the hoisting load can be cut off in time, further improving the safe power supply performance of the train.

[0014] Furthermore, it also includes a first isolation transformer, the input end of which is connected to the power supply bus, and the output end of which is connected to the first power supply cable, the second power supply cable, and the third power supply cable, respectively.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by setting up a first isolation transformer, the power supply of the travel load can be isolated from the bus, preventing the power supply of the bus from being affected when a short circuit or other fault occurs in the travel load.

[0016] Furthermore, it also includes a first disconnecting switch, one end of which is connected to the power supply bus, and the other end of which is connected to the input terminal of the first isolation transformer.

[0017] The advantage of adopting the above-mentioned further solution is that by setting a first disconnecting switch, the power supply from the busbar to the travel load can be directly disconnected through the first disconnecting switch.

[0018] Furthermore, the first isolation transformer is a three-phase isolation transformer.

[0019] Furthermore, it also includes a second isolation transformer, the input end of which is connected to the power supply bus, and the output end of which is connected to the fourth power supply cable, the fifth power supply cable, and the sixth power supply cable, respectively.

[0020] The beneficial effect of adopting the above-mentioned further solution is that by setting up a second isolation transformer, the power supply of the lifting load can be isolated from the bus, preventing the power supply of the bus from being affected when the lifting load experiences short circuits or other faults.

[0021] Furthermore, it also includes a second disconnecting switch, one end of which is connected to the power supply bus, and the other end of which is connected to the input terminal of the second isolation transformer.

[0022] The advantage of adopting the above-mentioned further solution is that by setting a second disconnecting switch, the power supply from the busbar to the lifting load can be directly disconnected through the second disconnecting switch.

[0023] Furthermore, the second isolation transformer is a three-phase isolation transformer.

[0024] Furthermore, the transformation ratio of both the first isolation transformer and the second isolation transformer is 1:1. Attached Figure Description

[0025] Figure 1 This is the electrical schematic diagram of this utility model. Detailed Implementation

[0026] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0027] like Figure 1 As shown, this embodiment provides a crane sliding contact line phase loss protection device, including a first phase sequence protector KVS1, a first circuit breaker QF1, a second phase sequence protector KVS2, and a second circuit breaker QF2. The first circuit breaker QF1 includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The first input terminal of the first circuit breaker QF1 is connected to phase L1 of the power supply bus via a first power supply cable. The second input terminal of the first circuit breaker QF1 is connected to phase L2 of the power supply bus via a second power supply cable. The third input terminal of the first circuit breaker QF1 is connected to phase L3 of the power supply bus via a third power supply cable. The first, second, and third output terminals of the first circuit breaker QF1 are respectively connected to the travel load of the crane. A phase sequence protector, also known as a phase sequence relay, is a three-phase power supply monitoring and protection device used in industrial equipment. It is mainly used to identify the power supply phase sequence to prevent motor reversal or damage caused by reversed phase sequence connections. It is widely used in elevators, central air conditioning systems, air compressors, and various types of electric motor equipment. This device provides protection by detecting parameters such as phase sequence and voltage of the three-phase power supply. When phase sequence errors, phase loss, overvoltage, undervoltage, or voltage imbalance occur, it will disconnect the control circuit. Some models integrate temperature protection and leakage protection functions, and use digital microchip technology to achieve automatic phase sequence switching. In this embodiment, the phase sequence protector closes its normally open contacts when phase sequence errors, phase loss, overvoltage, undervoltage, or voltage imbalance occur, thereby controlling the short-circuit coil of the circuit breaker to energize and disconnect the corresponding power supply circuit.

[0028] The first phase sequence protector KVS1 includes three first phase sequence input terminals and a first normally open contact. The three first phase sequence input terminals are respectively connected to the first power supply cable, the second power supply cable and the third power supply cable. One end of the first normally open contact is connected to the power supply bus, and the other end of the first normally open contact is connected to one end of the cutting coil of the first circuit breaker QF1. The other end of the cutting coil of the first circuit breaker QF1 is grounded.

[0029] The second circuit breaker QF2 includes a fourth input terminal, a fifth input terminal, a sixth input terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal. The fourth input terminal of the second circuit breaker QF2 is connected to phase L1 of the power supply bus via a fourth power supply cable. The fifth input terminal of the second circuit breaker QF2 is connected to phase L2 of the power supply bus via a fifth power supply cable. The sixth input terminal of the second circuit breaker QF2 is connected to phase L3 of the power supply bus via a sixth power supply cable. The fourth, fifth, and sixth output terminals of the second circuit breaker QF2 are respectively connected to the lifting load of the crane.

[0030] The second phase sequence protector KVS2 includes three second phase sequence input terminals and a second normally open contact. The three second phase sequence input terminals are respectively connected to the fourth power supply cable, the fifth power supply cable, and the sixth power supply cable. One end of the second normally open contact is connected to the power supply bus, and the other end of the second normally open contact is connected to one end of the cutting coil of the second circuit breaker QF2. The other end of the cutting coil of the second circuit breaker QF2 is grounded.

[0031] One end of the cutting coil of the first circuit breaker QF1 is connected to one end of the cutting coil of the second circuit breaker QF2 via a wire.

[0032] By setting up a first phase sequence protector KVS1 and a first circuit breaker QF1, when the overhead crane's sliding contact line breaks and falls, the power supply to the travel load becomes disordered. The normally open contact of the first phase sequence protector KVS1 closes, the tripping coil of the first circuit breaker QF1 is energized, and the first circuit breaker QF1 cuts off the power supply to the travel load. This effectively monitors abnormal conditions such as overvoltage, undervoltage, and three-phase imbalance in the power supply to the travel load, and promptly cuts off the power supply to the travel load when overvoltage, undervoltage, or three-phase imbalance occurs, ensuring that the sliding contact line is not energized after falling, thus guaranteeing personal and property safety. By installing a second phase sequence protector KVS2 and a second circuit breaker QF2, when the overhead crane's sliding contact line breaks and falls, the power supply to the travel load becomes disordered. The normally open contact of the second phase sequence protector KVS2 closes, energizing the cutting coil of the second circuit breaker QF2, thus cutting off the power supply to the lifting load. This effectively monitors abnormal conditions such as overvoltage, undervoltage, and three-phase imbalance in the power supply to the lifting load, and promptly cuts off the power supply to the lifting load when these conditions occur, further improving power supply safety. By electrically connecting one end of the cutting coil of the first circuit breaker QF1 to one end of the cutting coil of the second circuit breaker QF2 with a wire, when either the power supply to the travel load or the power supply to the lifting load experiences overvoltage, undervoltage, or three-phase imbalance, the power supply to both the travel load and the lifting load can be promptly cut off, further improving the safe power supply performance of the crane.

[0033] In some embodiments, the phase loss protection device further includes a first isolation transformer U1 and a first disconnecting switch QS1. The input terminal of the first isolation transformer U1 is connected to the power supply bus, and the output terminal of the first isolation transformer U1 is connected to a first power supply cable, a second power supply cable, and a third power supply cable, respectively. The first isolation transformer U1 is a three-phase isolation transformer with a transformation ratio of 1:1. By setting the transformation ratio of the first isolation transformer U1 to 1:1, the voltage isolation function of the first isolation transformer U1 can be guaranteed, but it does not have the function of stepping down or stepping up voltage, ensuring that the input and output voltages are equal, so as to guarantee the power supply voltage for the load.

[0034] The first disconnecting switch QS1 includes three contacts, one end of which is connected to phases L1, L2, and L3 of the power supply bus via the first disconnecting switch QS1. The first isolation transformer U1 includes three input coils and three output coils. One end of each of the three input coils is connected to the other end of the three contacts, and the other end of each input coil is grounded. One end of each of the three output coils is connected to one end of the first power supply cable, one end of the second power supply cable, and one end of the third power supply cable, and the other end of each output coil is grounded. The other ends of the first, second, and third power supply cables are connected to the first, second, and third input terminals of the first circuit breaker QF1, respectively.

[0035] By setting up the first isolation transformer U1, the power supply to the travel load can be isolated from the bus, preventing short circuits or other faults in the travel load from affecting the bus power supply. By setting up the first disconnecting switch QS1, the power supply from the bus to the travel load can be directly disconnected.

[0036] In some embodiments, the phase loss protection device further includes a second isolation transformer U2 and a second disconnecting switch QS2. The input terminal of the second isolation transformer U2 is connected to the power supply bus, and the output terminal of the second isolation transformer U2 is connected to the fourth power supply cable, the fifth power supply cable, and the sixth power supply cable, respectively. One end of the second disconnecting switch QS2 is connected to the power supply bus, and the other end of the second disconnecting switch QS2 is connected to the input terminal of the second isolation transformer U2. The second isolation transformer U2 is a three-phase isolation transformer with a transformation ratio of 1:1. By setting the transformation ratio of the second isolation transformer U2 to 1:1, the voltage isolation function of the second isolation transformer U2 can be guaranteed, but it does not have the function of stepping down or stepping up the voltage, ensuring that the input and output voltages are equal, so as to guarantee the power supply voltage for the lifting load.

[0037] The second isolation transformer U2 includes three contacts, one end of which is connected to phases L1, L2, and L3 of the power supply bus via the second disconnect switch QS2. The second isolation transformer U2 includes three input coils and three output coils. One end of each input coil is connected to the other end of the corresponding contact, and the other end of each input coil is grounded. One end of each output coil is connected to one end of the fourth, fifth, and sixth power supply cables, respectively, and the other end of each output coil is grounded. The other ends of the fourth, fifth, and sixth power supply cables are connected to the fourth, fifth, and sixth input terminals of the second circuit breaker QF2, respectively.

[0038] By installing a second isolation transformer U2, the power supply to the lifting load can be isolated from the busbar, preventing short circuits or other faults in the lifting load from affecting the busbar power supply. By installing a second isolating switch QS2, the power supply from the busbar to the lifting load can be directly disconnected.

[0039] It should be noted that the connection described in this utility model is an electrical connection via wires or conductors, the travel load is a travel motor that controls the movement of the trolley, and the lifting load is a lifting motor that controls the up and down movement of the trolley's lifting hook.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A phase-loss protection device for a railway sliding contact line, characterized in that: The system includes a first phase sequence protector (KVS1) and a first circuit breaker (QF1). The first circuit breaker (QF1) includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The first input terminal of the first circuit breaker (QF1) is connected to phase L1 of the power supply bus via a first power supply cable. The second input terminal of the first circuit breaker (QF1) is connected to phase L2 of the power supply bus via a second power supply cable. The third input terminal of the first circuit breaker (QF1) is connected to phase L3 of the power supply bus via a third power supply cable. The first, second, and third output terminals of the first circuit breaker (QF1) are respectively connected to the travel load of the tractor. The first phase sequence protector (KVS1) includes three first phase sequence input terminals and a first normally open contact. The three first phase sequence input terminals are respectively connected to the first power supply cable, the second power supply cable and the third power supply cable. One end of the first normally open contact is connected to the power supply bus, and the other end of the first normally open contact is connected to one end of the cutting coil of the first circuit breaker (QF1). The other end of the cutting coil of the first circuit breaker (QF1) is grounded.

2. The crane conductor rail phase failure protection device according to claim 1, characterized in that: It also includes a second phase sequence protector (KVS2) and a second circuit breaker (QF2). The second circuit breaker (QF2) includes a fourth input terminal, a fifth input terminal, a sixth input terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal. The fourth input terminal of the second circuit breaker (QF2) is connected to phase L1 of the power supply bus via a fourth power supply cable. The fifth input terminal of the second circuit breaker (QF2) is connected to phase L2 of the power supply bus via a fifth power supply cable. The sixth input terminal of the second circuit breaker (QF2) is connected to phase L3 of the power supply bus via a sixth power supply cable. The fourth, fifth, and sixth output terminals of the second circuit breaker (QF2) are respectively connected to the lifting load of the crane. The second phase sequence protector (KVS2) includes three second phase sequence input terminals and a second normally open contact. The three second phase sequence input terminals are respectively connected to the fourth power supply cable, the fifth power supply cable and the sixth power supply cable. One end of the second normally open contact is connected to the power supply bus, and the other end of the second normally open contact is connected to one end of the cutting coil of the second circuit breaker (QF2). The other end of the cutting coil of the second circuit breaker (QF2) is grounded.

3. The crane conductor rail phase failure protection device according to claim 2, characterized in that: One end of the cut-off coil of the first circuit breaker (QF1) is connected to one end of the cut-off coil of the second circuit breaker (QF2) via a wire.

4. The crane conductor rail phase failure protection device according to claim 3, characterized in that: It also includes a first isolation transformer (U1), the input end of which is connected to the power supply bus, and the output end of which is connected to the first power supply cable, the second power supply cable and the third power supply cable respectively.

5. The crane conductor rail phase failure protection device according to claim 4, characterized in that: It also includes a first disconnecting switch (QS1), one end of which is connected to the power supply bus, and the other end of which is connected to the input terminal of the first isolation transformer (U1).

6. The crane conductor rail phase failure protection device according to claim 5, characterized in that: The first isolation transformer (U1) is a three-phase isolation transformer.

7. The crane conductor rail phase failure protection device according to claim 6, characterized in that: It also includes a second isolation transformer (U2), the input end of which is connected to the power supply bus, and the output end of which is connected to the fourth power supply cable, the fifth power supply cable and the sixth power supply cable respectively.

8. The crane conductor rail phase failure protection device according to claim 7, characterized in that: It also includes a second disconnecting switch (QS2), one end of which is connected to the power supply bus, and the other end of which is connected to the input terminal of the second isolation transformer (U2).

9. The crane conductor rail phase failure protection device according to claim 8, characterized in that: The second isolation transformer (U2) is a three-phase isolation transformer.

10. The crane conductor rail phase failure protection device according to claim 9, characterized in that: The transformation ratio of the first isolation transformer (U1) and the second isolation transformer (U2) is 1:1.

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