A control circuit and system for extended power supply

Abstract

The present invention discloses a control circuit and system for extended power supply. In the circuit, the three-phase busbars of the front car and the rear car are connected to the normally open main contact of the extended contactor; the first ends of the first normally open auxiliary contacts of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are connected to the positive pole of the coil of the extended contactor; the negative poles of the coils of the first state feedback relay and the second state feedback relay are connected to the negative pole of the coil of the extended contactor; the second end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay and the first end of the second normally open auxiliary contact and the second end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay are connected at one place. The circuit and system of the present invention can reduce the influence of three-phase imbalance on the circuit and improve the reliability of the extended power supply of the train.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a control circuit and system for extended power supply. Background Art

[0002] Three-phase electricity is widely used in various rail vehicles such as electric locomotives, urban rail vehicles and EMUs. In order to reduce the redundancy of three-phase power supply, grid-connected power supply, cross power supply and extended power supply are often used between the carriages of the vehicle.

[0003] The three-phase voltage high-power loads on existing rail trains are basically only air conditioners and air compressors. The existing extended power supply circuit will independently configure a three-phase voltage monitoring relay for each air conditioner and air compressor to detect the normal three-phase voltage signal of the equipment. At the same time, the extended power supply device has many internal electrical equipment and wiring, and many fault points, which are prone to equipment damage, wiring harness misconnection, missing wires, etc. The extended power supply device uses a mechanical coil to energize and control the extended power supply, which has low reliability and increases the cost of phase sequence detection during the initial three-phase power supply during debugging and subsequent maintenance and replacement. Moreover, the existing extended power supply control circuit can only start the extended power supply when the power is off, and does not have the ability to monitor three-phase imbalance or leakage and missing phase conditions. . Summary of the invention

[0004] The purpose of the present invention is to provide a control circuit and system for extended power supply, which can reduce the influence of three-phase imbalance and equipment leakage on the circuit, and has the advantages of simple circuit, few fault points, high reliability, and low cost for early debugging and later operation and maintenance.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A control circuit for extended power supply, comprising:

[0007] A first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an expansion contactor;

[0008] The normally open main contacts of the extended contactor are respectively connected to the three-phase busbar of the leading vehicle and the three-phase busbar of the trailing vehicle;

[0009] The positive pole of the coil of the extension contactor is respectively connected to the first end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay and the first end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay;

[0010] The negative pole of the coil of the extension contactor is respectively connected to the negative pole of the coil of the first state feedback relay, the negative pole of the coil of the second state feedback relay and the negative pole of the power supply of the train control management system;

[0011] The second end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay is respectively connected to the first end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay, the second end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay and the positive pole of the power supply of the train control management system;

[0012] The second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay is connected to the positive pole of the coil of the first state feedback relay; the coil of the first three-phase voltage monitoring relay is connected to the three-phase busbar of the preceding vehicle;

[0013] The second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay is connected to the positive pole of the coil of the second state feedback relay; the coil of the second three-phase voltage monitoring relay is connected to the three-phase bus of the following vehicle;

[0014] A first end of the normally open auxiliary contact of the first state feedback relay is connected to a load of the preceding vehicle;

[0015] A first end of the normally open auxiliary contact of the second state feedback relay is connected to the load of the following vehicle;

[0016] The second end of the normally open auxiliary contact of the first state feedback relay and the second end of the normally open auxiliary contact of the second state feedback relay are both connected to the negative pole of the power supply of the train control and management system.

[0017] Optionally, the control circuit further includes: a control switch and a backup power supply;

[0018] The first end of the control switch is connected to the positive electrode of the power supply of the train control management system; the second end of the control switch is connected to the negative electrode of the power supply of the train control management system; the control switch is used to close when the power supply of the train control management system fails;

[0019] The positive pole of the backup power supply is connected to the second end of the control switch; the negative pole of the backup power supply is respectively connected to the negative pole of the coil of the first state feedback relay, the negative pole of the coil of the second state feedback relay and the negative pole of the coil of the extension contactor; the backup power supply is used to power all carriages when the control switch is closed.

[0020] Optionally, the supply voltage of the backup power supply is 110V.

[0021] Optionally, the models of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are both CM-MPS.41S.

[0022] A control system for extended power supply, comprising:

[0023] Train control management system and control circuit of the above-mentioned extended power supply;

[0024] The train control and management system is respectively connected to the positive pole of the coil of the first state feedback relay, the positive pole of the coil of the second state feedback relay, the second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay, and the second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay; the train control and management system is used to control the rear car to provide extended power supply to the front car when the power supply of the front car is abnormal, or to control the front car to provide extended power supply to the rear car when the power supply of the rear car is abnormal.

[0025] Optionally, the control system further includes: an auxiliary inverter;

[0026] The auxiliary inverter is respectively connected to the three-phase bus of the leading vehicle, the three-phase bus of the trailing vehicle and the train control management system;

[0027] The auxiliary inverter is used to convert direct current into alternating current.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention proposes a control circuit and system for three-phase extended power supply, the circuit comprises a first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an extended contactor; when the three-phase power of the carriage is normal, the coils of the first three-phase voltage monitoring relay, the second three-phase voltage monitoring relay, the first state feedback relay and the second state feedback relay are in a powered state, the normally open auxiliary contacts corresponding to the coils are closed, the coils of the extended contactor are short-circuited, and the normally open main contacts corresponding to the coils are disconnected; when the three-phase power of the leading vehicle is abnormal, the coils of the first three-phase voltage monitoring relay and the first state feedback relay lose power, the normally open auxiliary contacts corresponding to the coils are disconnected, the coils of the extended contactor are powered, the normally open auxiliary contacts corresponding to the coils are closed, and the following vehicle provides three-phase power to the leading vehicle; on the contrary, when the three-phase power of the following vehicle is abnormal, the coils of the second three-phase voltage monitoring relay and the second state feedback relay lose power, the normally open auxiliary contacts corresponding to the coils are disconnected, the coils of the extended contactor are powered, the normally open auxiliary contacts corresponding to the coils are closed, and the leading vehicle provides three-phase power to the following vehicle. The present invention replaces a large number of relays in the circuit by arranging a first three-phase voltage monitoring relay and a second three-phase voltage monitoring relay, so that the control circuit can reduce the influence of three-phase imbalance and equipment leakage on the circuit, and has the advantages of simple circuit, few fault points, high reliability, and low cost for early debugging and later operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A circuit diagram of a control circuit for extended power supply in an embodiment of the present invention.

[0032] Description of the drawings: LVD1-first three-phase voltage monitoring relay; LVD2-second three-phase voltage monitoring relay; KM-extension contactor; K1-first state feedback relay; K2-second state feedback relay; SA-control switch. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a control circuit and system for extended power supply, which can reduce the influence of three-phase imbalance and equipment leakage on the circuit, and has the advantages of simple circuit, few fault points, high reliability, and low cost for early debugging and later operation and maintenance.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example

[0037] Figure 1The circuit diagram of the control circuit for extended power supply in the embodiment of the present invention. Among them, 11, 12, 13 and 14 marked at LVD1 respectively represent the first end of the first normally open auxiliary contact, the second end of the first normally open auxiliary contact, the first end of the second normally open auxiliary contact and the second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay; 11, 12, 13 and 14 marked at LVD2 respectively represent the first end of the first normally open auxiliary contact, the second end of the first normally open auxiliary contact, the first end of the second normally open auxiliary contact and the second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay; 1-8 marked at KM respectively represent the first end of the first normally open main contact, the second end of the first normally open main contact, the first end of the second normally open main contact, the second end of the second normally open main contact, the first end of the third normally open main contact, the second end of the third ... first end of the third normally open main contact, the first end of the third normally open main contact, the first end of the third normally open main contact, the first end of the third normally open main contact, the first end of the third normally open main contact, the first end of the third normally open main contact, the first end of the third normally open The first end of the auxiliary contact and the second end of the normally open auxiliary contact; 1 and 2 marked at SA control the first end and the second end of the switch respectively; U, V, and W all represent three-phase busbars, among which U1, V1, and W1 all represent the three-phase busbars of the leading vehicle, and U2, V2, and W2 all represent the three-phase busbars of the trailing vehicle; 11, 13, 15, and 17 marked at K1 all represent the first end of the normally open auxiliary contact of the first state feedback relay, and 12, 14, 16, and 18 marked at K1 all represent the second end of the normally open auxiliary contact of the first state feedback relay; 11, 13, 15, and 17 marked at K2 all represent the first end of the normally open auxiliary contact of the second state feedback relay, and 12, 14, 16, and 18 marked at K2 all represent the second end of the normally open auxiliary contact of the second state feedback relay.

[0038] like Figure 1 As shown, the present invention provides a control circuit for extended power supply, including: a first three-phase voltage monitoring relay LVD1, a second three-phase voltage monitoring relay LVD2, a first state feedback relay K1, a second state feedback relay K2 and an extended contactor KM.

[0039] Among them, the normally open main contacts of the extended contactor KM are respectively connected to the three-phase bus of the leading car and the three-phase bus of the rear car; specifically, the first end of the first normally open main contact, the first end of the second normally open main contact and the first end of the third normally open main contact of the extended contactor KM are respectively connected to the three-phase bus of the leading car; the second end of the first normally open main contact, the second end of the second normally open main contact and the second end of the third normally open main contact of the extended contactor KM are respectively connected to the three-phase bus of the rear car; the positive pole of the coil of the extended contactor KM is respectively connected to the first end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay LVD1 and the first end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay LVD2; the negative pole of the coil of the extended contactor KM is respectively connected to the negative pole of the coil of the first state feedback relay K1, the negative pole of the coil of the second state feedback relay K2 and the negative pole of the power supply of the train control management system.

[0040] The second end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay LVD1 is respectively connected to the first end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay LVD1, the second end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay LVD2, the first end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay LVD2 and the positive pole of the power supply of the train control management system; the second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay LVD1 is connected to the positive pole of the coil of the first state feedback relay K1; the coil of the first three-phase voltage monitoring relay LVD1 is connected to the three-phase bus of the leading car; the second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay LVD2 is connected to the positive pole of the coil of the second state feedback relay K2; the coil of the second three-phase voltage monitoring relay LVD2 is connected to the three-phase bus of the following car.

[0041] The first end of the normally open auxiliary contact of the first state feedback relay K1 is connected to the load of the leading vehicle; the first end of the normally open auxiliary contact of the second state feedback relay K2 is connected to the load of the trailing vehicle; the second end of the normally open auxiliary contact of the first state feedback relay K1 and the second end of the normally open auxiliary contact of the second state feedback relay K2 are both connected to the negative pole of the power supply of the train control and management system.

[0042] The extended power supply control circuit provided by the present invention also includes a control switch SA and a backup power supply; the first end of the control switch SA and the second end of the control switch SA are respectively connected to the power supply of the train control management system (i.e., TCMS-D0 and TCMS-power supply in the figure); (the first end of the control switch SA is connected to the positive pole of the power supply of the train control management system; the second end of the control switch SA is connected to the negative pole of the power supply of the train control management system) the control switch SA is used to close when the power supply of the train control management system fails.

[0043] The positive pole of the backup power supply is connected to the second end of the control switch SA; the negative pole of the backup power supply is respectively connected to the negative pole of the coil of the first state feedback relay K1 and the negative pole of the coil of the second state feedback relay K2; the backup power supply is used to power all carriages when the control switch SA is closed.

[0044] Specifically, the supply voltage of the backup power supply is 110 V. The models of the first three-phase voltage monitoring relay LVD1 and the second three-phase voltage monitoring relay LVD2 are both CM-MPS.41S.

[0045] The present invention also provides a control system for extended power supply, comprising: a train control management system and the above-mentioned control circuit for extended power supply.

[0046] The train control and management system are respectively connected to the positive pole of the coil of the first state feedback relay K1, the positive pole of the coil of the second state feedback relay K2, the second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay LVD1, and the second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay LVD2; the train control and management system is used to control the rear car to extend the power supply to the front car when the power supply of the front car is abnormal, or to control the front car to extend the power supply to the rear car when the power supply of the rear car is abnormal.

[0047] The extended power supply control system provided by the present invention also includes: an auxiliary inverter; the auxiliary inverter is respectively connected to the three-phase bus of the front car, the three-phase bus of the rear car and the train control management system; the auxiliary inverter is used to convert direct current into alternating current.

[0048] Specifically, Figure 1 TCMS-DI1, TCMS-DI2 and TCMS-DI3 in the figure are signal collection points of the train control management system; the first end of the normally open auxiliary contact of the extension contactor is connected to the train control management system, and the second end of the normally open auxiliary contact of the extension contactor is respectively connected to the second end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay, the first end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay, the second end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay and the first end of the control switch. The first end of the normally open auxiliary contact of the extension contactor is used as the signal collection point TCMS-DI2, where the train control management system collects whether the normally open auxiliary contact of the extension contactor is closed; the train control management system collects the on-off signals of the first three-phase voltage monitoring relay and the first state feedback relay at TCMS-DI1; the train control management system collects the on-off signals of the second three-phase voltage monitoring relay and the second state feedback relay at TCMS-DI3 (i.e., "three-phase voltage normal" and "three-phase voltage abnormal"). In addition, the train control and management system also obtains the power supply status of the three-phase bus by detecting whether the auxiliary inverter is running.

[0049] The power supply of the train control and management system cooperates with the auxiliary inverter to provide three-phase electricity to the carriage. When the three-phase voltage monitoring relay monitors the normal state of the three-phase voltage, the coil is energized and its normally open auxiliary contacts are closed; at the same time, the coil of the corresponding state feedback relay is energized, its normally open auxiliary contacts are closed, and the train load (air conditioner, air compressor, etc.) is energized. At this time, the coil of the extension contactor is short-circuited, and the normally open main contacts of the extension contactor are disconnected (that is, the power supply of the train control and management system is respectively for the front and rear carriages); the train control and management system collects the on-off signals of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay, and determines whether to issue an extended power supply instruction to close the extension contactor, and the carriage with normal three-phase voltage supply supplies power to the adjacent carriage. Among them, the three-phase voltage monitoring relay has the functions of three-phase phase loss monitoring, phase sequence monitoring, over-voltage and under-voltage, and three-phase imbalance monitoring.

[0050] The three-phase voltage monitoring relay is installed in the rail train car. When the three-phase bus of the car stops supplying power, the normally closed contacts of the three-phase voltage monitoring relay corresponding to the power-off car are closed and the normally open auxiliary contacts are disconnected. At this time, the car that stops the three-phase power supply is called the target extended power supply car.

[0051] If the target extended power supply car is the front car, the train control management system collects the "three-phase voltage abnormality" signal of the first three-phase voltage monitoring relay through the signal collection point TCMS-DI1, and the train control management system sends an extended power supply instruction, the extended contactor coil is energized, and the normally open main contact of the extended contactor is closed to connect the three-phase bus of the front car and the three-phase bus of the rear car. The rear car provides extended power supply to the front car through the three-phase bus. After the extended power supply, the coil of the first three-phase voltage monitoring relay is energized again, and the normally open auxiliary contact is closed again; the coil of the first state feedback relay is energized again, and the normally open auxiliary contact is closed again. The train control management system collects the three-phase bus voltage status after the extended power supply through the signal collection point TCMS-DI1.

[0052] On the contrary, if the target extended power supply car is the rear car, the train control management system collects the "three-phase voltage abnormality" signal of the second three-phase voltage monitoring relay through the signal collection point TCMS-DI3, and the train control management system sends an extended power supply instruction, the extended contactor coil is energized, and the normally open main contact of the extended contactor is closed to connect the three-phase bus of the front car and the three-phase bus of the rear car. The front car supplies power to the rear car through the three-phase bus. After the extended power supply, the coil of the second three-phase voltage monitoring relay is energized again; the normally open auxiliary contact is closed again; the coil of the second state feedback relay is energized again; the normally open auxiliary contact is closed again. The train control management system collects the voltage status of the three-phase bus after the extended power supply through the signal collection point TCMS-DI3.

[0053] In addition, when a failure occurs in the train control and management system, the power supply of the train control and management system can no longer supply power to the train. At this time, the control switch is closed and the front and rear carriages of the train are powered by the backup power supply.

[0054] The control circuit and system of the extended power supply provided by the present invention use electronic components to replace the original mechanical coil of the extended power supply to obtain electricity and attract, thereby improving the reliability of the extended power supply of the train; two smaller three-phase voltage monitoring relays are used to replace three conventional relays, and the three-phase voltage monitoring relays set at each load of the train are cancelled, thereby reducing the space utilization rate of the extended power supply device, simplifying the extended power supply circuit, reducing the failure points of the extended power supply circuit, and reducing the cost of early debugging and later operation and maintenance; the present invention uses three-phase loads or single-phase loads with balanced configuration, and uses three-phase voltage monitoring relays that can perform three-phase phase loss monitoring, phase sequence monitoring, over-voltage and under-voltage monitoring and three-phase imbalance monitoring, thereby reducing the impact of three-phase imbalance and equipment leakage on the power supply of the train.

[0055] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. At the same time, for those of ordinary skill in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A control circuit for extended power supply, characterized in that: The control circuit comprises: A first three-phase voltage monitoring relay, a second three-phase voltage monitoring relay, a first state feedback relay, a second state feedback relay and an expansion contactor; The normally open main contacts of the extended contactor are respectively connected to the three-phase busbar of the leading vehicle and the three-phase busbar of the trailing vehicle; The positive pole of the coil of the extension contactor is respectively connected to the first end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay and the first end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay; The negative pole of the coil of the extension contactor is respectively connected to the negative pole of the coil of the first state feedback relay, the negative pole of the coil of the second state feedback relay and the negative pole of the power supply of the train control management system; The second end of the first normally open auxiliary contact of the first three-phase voltage monitoring relay is respectively connected to the first end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay, the second end of the first normally open auxiliary contact of the second three-phase voltage monitoring relay, the first end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay and the positive pole of the power supply of the train control management system; The second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay is connected to the positive pole of the coil of the first state feedback relay; the coil of the first three-phase voltage monitoring relay is connected to the three-phase busbar of the preceding vehicle; The second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay is connected to the positive pole of the coil of the second state feedback relay; the coil of the second three-phase voltage monitoring relay is connected to the three-phase bus of the following vehicle; A first end of the normally open auxiliary contact of the first state feedback relay is connected to a load of the preceding vehicle; A first end of the normally open auxiliary contact of the second state feedback relay is connected to the load of the following vehicle; The second end of the normally open auxiliary contact of the first state feedback relay and the second end of the normally open auxiliary contact of the second state feedback relay are both connected to the negative pole of the power supply of the train control and management system.

2. The control circuit for extended power supply according to claim 1, characterized in that: The control circuit further includes: a control switch and a backup power supply; The first end of the control switch is connected to the positive electrode of the power supply of the train control management system; the second end of the control switch is connected to the negative electrode of the power supply of the train control management system; the control switch is used to close when the train control management system fails; The positive pole of the backup power supply is connected to the second end of the control switch; the negative pole of the backup power supply is respectively connected to the negative pole of the coil of the first state feedback relay, the negative pole of the coil of the second state feedback relay and the negative pole of the coil of the extension contactor; the backup power supply is used to power all carriages when the control switch is closed.

3. The control circuit for extended power supply according to claim 2, characterized in that: The supply voltage of the backup power supply is 110V.

4. The control circuit for extended power supply according to claim 1, characterized in that: The models of the first three-phase voltage monitoring relay and the second three-phase voltage monitoring relay are both CM-MPS.41S.

5. A control system for extended power supply, characterized in that: The control system comprises: A train control management system and a control circuit for extended power supply as claimed in any one of claims 1 to 4; The train control and management system is respectively connected to the positive pole of the coil of the first state feedback relay, the positive pole of the coil of the second state feedback relay, the second end of the second normally open auxiliary contact of the first three-phase voltage monitoring relay, and the second end of the second normally open auxiliary contact of the second three-phase voltage monitoring relay; the train control and management system is used to control the rear car to provide extended power supply to the front car when the power supply of the front car is abnormal, or to control the front car to provide extended power supply to the rear car when the power supply of the rear car is abnormal.

6. The control system for extended power supply according to claim 5, characterized in that: The control system further includes: an auxiliary inverter; The auxiliary inverter is respectively connected to the three-phase bus of the leading vehicle, the three-phase bus of the trailing vehicle and the train control management system; The auxiliary inverter is used to convert direct current into alternating current.

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