Input power supply switching circuit and railway communication power supply system

Abstract

The utility model discloses an input power supply switching circuit and a railway communication power supply system. The input power supply switching circuit comprises an AC switching device, circuit breakers QF1-QF4 and change-over switches SA1-SA2. The input ends of the QF1 and the QF2 are correspondingly connected with two paths of AC input power supplies; the output ends of the QF1 and the QF2 are connected with the QF3 through an alternating current switching device; the alternating current switching device is used for switching two paths of alternating current input power supplies into one path of alternating current power supply and then accessing the QF3; the output end of the QF3 is connected with post-stage electric equipment; the input end of the QF4 is connected with the output end of a generator F power supply; and the output end of the QF4 is connected with the power supply input end of post-stage electric equipment. Two paths of input power supplies and one path of generator power supply can be connected, when one path fails, the input power supply is reliably switched, or the two paths of input power supplies fail, power is supplied by the generator, normal power supply to railway communication equipment is guaranteed, and the running safety of a train is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to input power supply switching and railway traffic technical field, especially input power supply switching circuit and railway communication power supply system. BACKGROUND

[0002] Rail transit is an important form of transportation, in order to ensure that rail transit orderly, for rail transit communication equipment power supply equipment, especially important. Among them, the railway communication power supply system equipment is used to provide power supply for railway station yard communication equipment.

[0003] Railway communication power supply system is the key basic equipment for railway signal operation and dispatching communication equipment power supply, which can ensure that the communication equipment works reliably, accurately and safely. The power consumption of different communication equipment is different, but the power supply quality and reliability are high, so the relevant departments have formulated the relevant standards of railway communication power supply system. In the new standard, special requirements are made for input switching circuit.

[0004] Railway communication equipment is DC 48V power equipment, which mainly converts alternating current power supply into DC 48V through multiple parallel working rectifier modules. Railway communication power supply system is a power supply system equipment that integrates AC input, rectification, DC output and monitoring unit in a cabinet.

[0005] However, the current railway communication power supply system can only access one power supply, and when the input power supply appears under-voltage, power failure, phase loss and other faults, it will affect the normal operation of railway communication equipment, and even cause instant power failure of railway communication equipment, which may cause unpredictable situations such as train stop, seriously affecting the safety of train operation.

[0006] Therefore, it is urgent to develop a technology to solve the above technical problems. UTILITY MODEL CONTENT

[0007] The utility model aims at the technical defects of prior art, and provides an input power supply switching circuit and railway communication power supply system.

[0008] Therefore, the utility model provides an input power supply switching circuit, which comprises an AC switching device, circuit breakers QF1-QF4 and change-over switches SA1-SA2.

[0009] The input end of the circuit breakers QF1 and QF2 is connected with two-way AC input power supply correspondingly.

[0010] The two-way AC input power supply comprises I-way mains input power supply and II-way mains input power supply.

[0011] The output ends of the circuit breakers QF1 and QF2 are connected with the circuit breaker QF3 through an AC switching device;

[0012] The AC switching device is used for switching two AC input power supplies into one AC power supply and then connecting the AC power supply with the circuit breaker QF3;

[0013] The output end of the circuit breaker QF3 is connected with the power supply input end of the subsequent power-using equipment.

[0014] The input end of the circuit breaker QF4 is connected with the output end of the generator F power supply.

[0015] The output end of the circuit breaker QF4 is connected with the power supply input end of the subsequent power-using equipment.

[0016] In addition, the utility model provides a railway communication power supply system, it includes the input power supply switching circuit as mentioned above, and a plurality of railway communication equipment;

[0017] The railway communication equipment is connected with the input power supply switching circuit.

[0018] The railway communication equipment is the subsequent power-using equipment in the input power supply switching circuit.

[0019] From the above technical scheme provided by the utility model can see, compared with the prior art, the utility model provides an input power supply switching circuit and railway communication power supply system, its design science can access two input power supplies, when one of the input power supplies fails, it is convenient and reliable to carry out input power supply switching, guarantees the normal power supply of railway communication equipment, thereby guarantees the operation safety of train, has the great practical significance.

[0020] In addition, for the utility model, it can connect the generator power supply while not opening the city electricity input circuit breaker, guarantees the continuity of AC input power supply, thereby guarantees the normal work of railway communication equipment and railway communication system, guarantees the operation safety of train.

[0021] In addition, the utility model provides an AC input switching circuit for the circuit layout of the railway communication power supply system which is powered by two AC input power supplies and one generator power supply.

[0022] In addition, by applying the utility model, when the commercial power needs to be overhauled, remote switching can be carried out, personnel need not be dispatched to the site to carry out switching at unattended stations, and the manual and time costs of switching at unattended communication stations can be effectively reduced.

[0023] Through inspection, the circuit provided by the utility model is an AC input switching circuit with strong anti-interference ability and high safety, the manual rotary switch used is a safety switch, and can be reliably applied to railway communication power supply system equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A principle diagram of the input power switching circuit is provided for the utility model;

[0025] Figure 2 A related acquisition control circuit schematic diagram of the monitoring module including four monitoring units in the input power switching circuit is provided for the utility model;

[0026] Figure 3 An electrical circuit diagram of the AC switching device in the input power switching circuit is provided for the utility model;

[0027] Figure 4 An appearance schematic diagram of the switching switch SA1 as a manual switching switch in the input power switching circuit is provided for the utility model;

[0028] Figure 5 An appearance schematic diagram of the switching switch SA2 as a working mode switch in the input power switching circuit is provided for the utility model;

[0029] Figure 6 An electrical circuit diagram of the relay in the input power switching circuit is provided for the utility model. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] In the description of the patent, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For ordinary skilled in the art, the specific meaning of the above terms in the patent can be understood according to the specific circumstances.

[0032] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified.

[0033] Referring to Figures 1 to 5 The utility model provides an input power switching circuit, it includes: alternating current switching device, circuit breaker QF1~QF4 and change-over switch SA1~SA2,

[0034] The input end of circuit breaker QF1 and QF2 is connected with two-way alternating current input power (that is, mains input power, that is, alternating current mains) correspondingly.

[0035] Two-way alternating current input power includes I-way mains input power and II-way mains input power.

[0036] The output end of circuit breaker QF1 and QF2 is connected with circuit breaker QF3 through alternating current switching device.

[0037] Alternating current switching device is used to switch two-way alternating current input power into one-way alternating current power and then connect circuit breaker QF3.

[0038] The output end of circuit breaker QF3 is connected with the power input end of the subsequent power consumption equipment (for example, railway communication equipment).

[0039] The input end of circuit breaker QF4 is connected with the output end of generator F power supply.

[0040] The output end of circuit breaker QF4 is connected with the power input end of the subsequent power consumption equipment (for example, railway communication equipment).

[0041] In the utility model, circuit breaker QF3 and QF4 are connected through mechanical interlocking device in specific implementation.

[0042] It should be noted that the mechanical interlocking device is used to select one of the two paths (i.e., select one of the power supply or the generator F power supply) to supply power to the rear stage power equipment (such as railway communication equipment) between the circuit breakers QF3 and QF4. The mechanical interlocking device is a mechanical component for selecting two of the two miniature circuit breakers, which is designed and produced by Tianjin Railway Signal Co., Ltd. and is a mature component in the prior art. The mechanical interlocking device is a mature and well-known technical means in the prior art, and the installation mode is a conventional mode, which will not be described here.

[0043] It should be noted that the two-way AC input power supply is two-way power supply, which can be three-phase AC 380V power supply or single-phase AC 220V power supply. When it is a single-phase power supply, the live wire should be connected to the first pin of the circuit breakers QF1 and QF2.

[0044] In the utility model, the first, third and fifth pins (i.e., contacts) of the input end of the circuit breaker QF1 are respectively connected to the A, B and C phase power supply lines of the I-way power supply.

[0045] The first, third and fifth pins of the input end of the circuit breaker QF2 are respectively connected to the A, B and C phase power supply lines of the II-way power supply.

[0046] It should be noted that the input end of the circuit breakers QF1, QF2, QF3 and QF4 refers to the first, third and fifth pins of the circuit breakers, and the output end refers to the second, fourth and sixth pins of the circuit breakers.

[0047] In the utility model, the AC switching device comprises contactors 1KM-2KM.

[0048] The output ends of the circuit breakers QF1 and QF2 are respectively connected to the contactors 1KM and 2KM in the AC switching device.

[0049] In particular, the second, fourth and sixth pins of the output end of the circuit breaker QF1 are respectively connected to the 1L1, 3L2 and 5L3 pins of the 1KM contactor in the AC switching device after passing through the AC transformers 1JC, 2JC and 3JC.

[0050] The second, fourth and sixth pins of the output end of the circuit breaker QF2 are respectively connected to the 1L1, 3L2 and 5L3 pins of the 2KM contactor in the AC switching device after passing through the AC transformers 4JC, 5JC and 6JC.

[0051] It should be noted that the output end of the AC transformers 1JC, 2JC, 3JC, 4JC, 5JC and 6JC refers to the first and second pins of the AC transformers.

[0052] In the utility model, specifically realize, the output end of contactor 1KM and 2KM in alternating current switching device converges after connecting circuit breaker QF3's input end;

[0053] Specifically, the output end 2T1 and 4T2, 6T3 pin of contactor 1KM in flow switching device, respectively with the output end 2T1, 4T2 and 6T3 pin of contactor 2KM corresponding converging intersection, then respectively connect the input end 1st, 3rd and 5th pin of circuit breaker QF3 again;

[0054] It needs to be explained that the input end of alternating current switching device is the 1L1, 3L2 and 5L3 pin of contactor 1KM, 2KM, and the output end of alternating current switching device is the 2T1, 4T2 and 6T3 pin of contactor 1KM, 2KM.

[0055] In the utility model, specifically realize, the input end 1st, 3rd and 5th pin (that is contact point) of circuit breaker QF4 connects the A, B and C phase power supply line of generator F power supply;

[0056] The output end 2nd, 4th and 6th pin of circuit breaker QF4, respectively with the output end 2nd, 4th and 6th pin of circuit breaker QF3 corresponding converging intersection, then with the power equipment (for example railway communication equipment) of rear stage is connected, and the power equipment (for example railway communication equipment) of rear stage is powered (specifically the A, B and C phase power supply access line of power equipment of rear stage).

[0057] In the utility model, specifically realize, referring to Figure 1 、 Figure 3 For alternating current switching device, the 62nd pin (that is contact point) of contactor 2KM is connected with the 1L1 pin of contactor 1KM;

[0058] The 61st pin of contactor 2KM is connected with the coil contact point A2 of contactor 1KM;

[0059] The coil contact point A1 of contactor 1KM is connected with the 13th pin of change-over switch SA1 and the 10th pin of relay 1KA respectively;

[0060] The 14th pin of change-over switch SA1 is connected with the 11th pin of change-over switch SA2;

[0061] The 2nd pin of relay KA is connected with the 23rd pin of change-over switch SA2;

[0062] The 24th pin of change-over switch SA2 is connected with the 9th pin of relay KA;

[0063] The 1st pin of relay KA is connected with the 12th pin of change-over switch SA2.

[0064] In particular, the 12th pin of the change-over switch SA2 is connected with the N-phase line (zero line, for example, N-phase copper bar) of any one of the two AC input power supplies;

[0065] In the utility model, in particular, referring to Figure 1 、 Figure 3 As shown in the figure, for the AC switching device, the 62nd pin of the contactor 1KM is connected with the 1L1 pin of the contactor 2KM;

[0066] The 61st pin of the contactor 1KM is connected with the coil contact A2 of the contactor 2KM;

[0067] The coil contact A1 of the contactor 2KM is connected with the 23rd pin of the change-over switch SA1 and the 12th pin of the relay KA respectively;

[0068] The 24th pin of the change-over switch SA1 is connected with the 31st pin of the change-over switch SA2;

[0069] The 8th pin of the relay KA is connected with the 43rd pin of the change-over switch SA2;

[0070] The 44th pin of the change-over switch SA2 is connected with the 11th pin of the relay KA;

[0071] The 7th pin of the relay KA is connected with the 32nd pin of the change-over switch SA2.

[0072] In particular, the 32nd pin of the change-over switch SA2 is connected with the N-phase line (zero line, for example, N-phase copper bar) of any one of the two AC input power supplies;

[0073] In the utility model, in particular, referring to Figure 4 , the change-over switch SA1 is a manual switching switch, when the handle of the change-over switch SA1 is at the left 45° position, the manual control loop of the commercial power I (namely, the I-way commercial input power supply) of the railway communication power supply system is in the on state, and the manual control loop of the commercial power II (namely, the II-way commercial input power supply) is in the off state; when the handle of the change-over switch SA1 is at the right 45° position, the manual control loop of the commercial power I of the railway communication power supply system is in the off state, and the manual control loop of the commercial power II is in the on state; when the handle of the change-over switch SA1 is at the 0° position, the manual control loops of the commercial power I and the commercial power II of the railway communication power supply system are both in the off state.

[0074] In terms of specific implementation, the changeover switch SA1 is an existing changeover switch, specifically the LA39-A3-20CXS / K model manufactured by Suzhou Siemens Electrical Co., Ltd. This changeover switch can be customized according to circuit requirements, and its appearance can be as follows... Figure 4 As shown in Table 1, the on / off state of the changeover switch is as follows.

[0075] Table 1:

[0076]

[0077] In Table 1, X represents "on". Normal position 1 is 45° to the left, position 2 is 0°, and position 3 is 45° to the right.

[0078] Left 45° position (i.e., AC power I position): Pins 13 and 14 are connected at this time.

[0079] 0° position (i.e., off position): All pins are off.

[0080] Right 45° position (i.e., AC power II position): Pins 23 and 24 are connected at this time.

[0081] In this utility model, for specific implementation, see [link to relevant documentation]. Figure 5 The changeover switch SA2 is the working mode switch. When the handle of the changeover switch SA1 is in the left 45° position, the input switching mode of the railway communication power system is in manual mode; when the handle of the changeover switch SA1 is in the right 45° position, the input switching mode of the railway communication power system is in automatic mode.

[0082] In terms of specific implementation, the SA2 changeover switch is an existing changeover switch, specifically the LA39-A3-22-CX / K model manufactured by Suzhou Siemens Electrical Co., Ltd. This changeover switch can be customized according to circuit requirements, and its appearance can be as follows... Figure 5 As shown in Table 2, the on / off state of the changeover switch is as follows.

[0083] Table 2:

[0084]

[0085] In Table 2, X indicates that the circuit is on. Normal position 1 is at a 45° left angle, and position 2 is at a 45° right angle.

[0086] Left 45° position (i.e., manual position): At this time, pins 11, 12 and 31, 32 are turned on.

[0087] Right 45° position (i.e., automatic position): At this time, pins 23, 24 and 43, 44 are connected.

[0088] In the utility model, the AC switching device is realized, which contains contactor 1KM, 2KM and mechanical interlocking, is the mature electrical element of prior art, the specific model of AC switching device can be liangxin NDC1N-9540 AC contactor produced by Shanghai liangxin electrical appliance Co., Ltd., and the AC contactor is a contactor with mechanical interlocking, and the electrical circuit diagram of the AC switching device is as shown in Figure 3 The coil contact points of the contactor 1KM and 2KM are A1 and A2, and are specifically distinguished by 1KM-A1 and 2KM-A1; the contactor 1KM and 2KM have three groups of normally open contact points (1L1, 2T1), (3L2, 4T2) and (5L3, 6T3) and one group of normally closed auxiliary contact points (61, 62);

[0089] It should be noted that the three groups of normally open contact points (1L1, 2T1), (3L2, 4T2) and (5L3, 6T3) of the coil contact points A1 and A2 of the contactor 1KM and 2KM change from normally open to normally closed under the condition of power (220V); similarly, the one group of normally closed auxiliary contact points (61, 62) changes from normally closed to normally open.

[0090] In the utility model, the main contact point rated current of the liangxin NDC1N-9540 AC contactor is 95A current, and the specific power can be selected according to the specific circuit. The AC switching device is not limited to the type and specification in the utility model. As long as it meets Figure 1 The functions and structures of the above AC switching device can be used.

[0091] In the utility model, the relay KA is the existing relay, and specifically can be the CR-M024DC4L type relay produced by Xinhui Low Voltage Switch Co., Ltd. (ABB), and the electrical circuit diagram of the relay is as shown in Figure 6 The coil identification of the relay is 13 and 14, has two groups of normally open contact points (7, 11) and (8, 12), and two groups of normally closed contact points (1, 9) and (2, 10).

[0092] It should be noted that the two groups of normally open contact points (7, 11) and (8, 12) of the coil contact points 13 and 14 of the relay change from normally open to normally closed under the condition of power (DC24V); similarly, the two groups of normally closed contact points (1, 9) and (2, 10) change from normally closed to normally open. The state of the relay contact point is used to control the automatic switching of the AC switching device.

[0093] In a specific implementation, the CR-M024DC4L model relay produced by ABB is a small electromagnetic relay, has four groups of independent contacts, each group of contacts has one common contact, one normally open contact and one normally closed contact, and the model of the relay is not limited to the model and specifications in the utility model, as long as it meets Figure 6 Any one of the existing relays with the functions and structures of the above relays can be adopted.

[0094] In the utility model, in a specific implementation, it further includes a monitoring module (including four monitoring units J1-J4);

[0095] The monitoring module is connected with the relay KA, the AC switching device, and the AC transformers 1JC, 2JC, 3JC, 4JC, 5JC and 6JC, and is used for realizing real-time monitoring of input voltages, currents, frequencies and switching states of two-way AC input power sources, sending a control signal to the relay KA to control the relay KA to act and switch the two-way AC input power sources (I-way and II-way power input power sources) when the monitoring module detects that the two-way AC input power sources (i.e. external power grid, specifically I-way and II-way power input power sources) have faults (such as input overvoltage, under-voltage, open-phase, wrong-phase and the like);

[0096] It should be noted that the monitoring module is a mature monitoring module that has been widely applied, is an existing finished electrical module, and the above-mentioned functions of the monitoring module are the functions of the existing finished module, which will not be described here. The monitoring module, for example, can adopt the HKTT type monitoring module produced by Tianjin Railway Signal Co., Ltd.

[0097] In a specific implementation, when the remote switching operation is performed, the control command is also sent by the monitoring unit and executed by the relay KA.

[0098] In a specific implementation, the relay KA is a control switch for automatic switching and remote manual switching of two-way power sources, detects that the external power grid (specifically I-way and II-way power input power sources) has input overvoltage, under-voltage, open-phase, wrong-phase and the like, controls the relay KA to act and switch the two-way power sources, has an I-way power input power source priority switching function, and when the remote switching operation is performed, the control command is also sent by the monitoring unit and executed by the relay KA.

[0099] In the utility model, in a specific implementation, the monitoring module adopts the HKTT type monitoring module produced by Tianjin Railway Signal Co., Ltd.

[0100] The monitoring module includes monitoring units J1-J4.

[0101] The monitoring unit J1 is used for monitoring the voltage of the I-way mains input power supply.

[0102] The monitoring unit J2 is used for monitoring the current of the I-way mains input power supply.

[0103] The monitoring unit J3 is used for monitoring the voltage of the II-way mains input power supply.

[0104] The monitoring unit J4 is used for monitoring the current of the II-way mains input power supply.

[0105] It should be noted that, as mentioned above, the monitoring module is a mature monitoring module in the prior art, which has been widely applied and is an existing finished electrical module. The four units J1-J4 included in the monitoring module play the above-mentioned functions, which are the existing functions of the monitoring units in the existing finished module, and thus will not be described herein.

[0106] In a specific implementation, the first pin of the monitoring unit J1 is connected with the 1L1 pin of the contactor 1KM in the AC switching device.

[0107] The third pin of the monitoring unit J1 is connected with the 3L2 pin of the contactor 1KM in the AC switching device.

[0108] The fifth pin of the monitoring unit J1 is connected with the 5L3 pin of the contactor 1KM in the AC switching device.

[0109] The seventh pin of the monitoring unit J1 is connected with the N-phase line (for example, the N-phase copper bar) of the I-way mains input power supply.

[0110] In a specific implementation, the first pin of the monitoring unit J2 is connected with the first pin of the AC transformer 1JC (which is an A-phase AC transformer) of the I-way mains input power supply.

[0111] The second pin of the monitoring unit J2 is connected with the second pin of the AC transformer 1JC (which is an A-phase AC transformer) of the I-way mains input power supply.

[0112] The third pin of the monitoring unit J2 is connected with the first pin of the AC transformer 2JC (which is a B-phase AC transformer) of the I-way mains input power supply.

[0113] The fourth pin of the monitoring unit J2 is connected with the second pin of the AC transformer 2JC (which is a B-phase AC transformer) of the I-way mains input power supply.

[0114] The fifth pin of the monitoring unit J2 is connected with the first pin of the AC transformer 3JC (which is a C-phase AC transformer) of the I-way mains input power supply.

[0115] The 6th pin of the monitoring unit J2 is connected with the 2nd pin of the AC transformer 3JC (C-phase AC transformer) of the I-way power input power supply;

[0116] In a specific implementation, the 1st pin of the monitoring unit J3 is connected with the 1L1 pin of the contactor 2KM in the AC switching device;

[0117] The 3rd pin of the monitoring unit J3 is connected with the 3L2 pin of the contactor 2KM in the AC switching device;

[0118] The 5th pin of the monitoring unit J3 is connected with the 5L3 pin of the contactor 2KM in the AC switching device;

[0119] The 7th pin of the monitoring unit J3 is connected with the N-phase line (for example, N-phase copper bar) of the II-way power input power supply;

[0120] In a specific implementation, the 1st pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 4JC (A-phase AC transformer) of the II-way power input power supply;

[0121] The 2nd pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 4JC (A-phase AC transformer) of the II-way power input power supply;

[0122] The 3rd pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 5JC (B-phase AC transformer) of the II-way power input power supply;

[0123] The 4th pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 5JC (B-phase AC transformer) of the II-way power input power supply;

[0124] The 5th pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 6JC (C-phase AC transformer) of the II-way power input power supply;

[0125] The 6th pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 6JC of the II-way power input power supply.

[0126] In a specific implementation, the +12V pin of the CON4 port of the monitoring module is connected with the 14th pin of the relay KA;

[0127] The -12V pin of the CON4 port of the monitoring module is connected with the CON-7 pin of the J24 port of the monitoring module;

[0128] The NO-7 pin of the J24 port of the monitoring module is connected with the 13th pin of the relay KA.

[0129] In order to more clearly understand the utility model, the working principle of the monitoring module is introduced below.

[0130] For the existing, finished monitoring module (specifically HKTT type monitoring module produced by Tianjin Railway Signal Co., Ltd.), the monitoring unit J2 and the monitoring unit J4 in the monitoring module are connected with the current monitoring circuit in the monitoring module; the monitoring unit J1 and the monitoring unit J3 are connected with the voltage reduction conversion circuit in the monitoring module; the voltage reduction conversion circuit is connected with the voltage monitoring circuit in the monitoring module; the monitoring unit J1-J4 are also connected with the frequency monitoring circuit in the monitoring module. The current monitoring circuit, the voltage monitoring circuit and the frequency monitoring circuit are connected with the control chip in the monitoring module. The connection relationship between these monitoring units, circuits and control chips and the working principle of mutual cooperation are the existing content of the finished monitoring module itself, which is the existing mature technology that has been applied, and will not be described here.

[0131] In specific implementation, the monitoring module collects the voltage, current, frequency and other information of the input power through the contact points of the four monitoring units J1, J2, J3 and J4 in the monitoring module. Among them, the current information of the input power is converted into a 0-20mA current signal by an alternating current transformer and enters the current monitoring circuit in the monitoring module; the voltage information of the input power is converted into a 0-20mA current signal by the voltage reduction conversion circuit in the monitoring module and enters the voltage monitoring circuit in the monitoring module; the frequency information is monitored by the frequency monitoring circuit in the monitoring module. If the information (voltage information and current information of the input power, frequency information, etc.) exceeds the overvoltage value, undervoltage value, overcurrent value and frequency abnormal value of the input power set in advance by the monitoring module, the control chip in the monitoring module sends a control command to control the coil of the relay KA to be powered or lose power, and then the contact point of the relay KA controls the alternating switching device to switch between the two power sources.

[0132] For example, if it is found that the mains I power supply is abnormal and the mains II power supply is normal, the monitoring module controls the relay KA to be attracted (specifically through the control chip inside it), the two groups of normally closed contacts (1, 9), (2, 10) of the relay KA change from normally closed to normally open, the coil of the contactor 1KM of the AC switching device loses power, the normally closed contact of the contactor 1KM is closed, and at the same time, the normally open contacts (7, 11), (8, 12) of the relay KA change from normally open to normally closed, the coil of the contactor 2KM of the AC switching device gets power, and the main contact of the contactor 2KM is closed. At this time, the input power is switched from the mains I to the mains II, realizing the automatic switching of the two power supplies. If the mains I power supply recovers to normal, the monitoring module (specifically the control chip inside it) controls the relay KA to be disconnected, so that the downstream power-consuming devices (such as railway communication equipment) in the railway communication power supply system resume the mains I power supply (i.e. the I priority function).

[0133] It should be noted that the contacts (i.e. pins) +12V and -12V of the CON4 port of the monitoring module can output DC 24V power. The J24 port of the monitoring module is a group of auxiliary contacts, among which the contact (i.e. pin) CON-7 is a common terminal, and the contacts (i.e. pins) CON-7 and NO-7 are a group of normally open contacts which change from normally open to normally closed when the monitoring module determines that two-way switching is needed.

[0134] It should be noted that the monitoring module itself has two control modes, manual mode and automatic mode. In manual mode, the mains I or mains II can be selected manually through the monitoring module. The manual switching function of the monitoring module, specifically the "AC input selection" manual switching function, can be set to "ACA1 or AC2" two working modes. When set to AC1 working mode, the communication power supply is in mains I working mode, and when set to AC2 working mode, the communication power supply is switched to mains II working mode.

[0135] It should be noted that when the monitoring module is in manual mode, even if the monitoring units J1, J2, J3, J4 detect problems such as overvoltage, undervoltage, overcurrent, open phase, wrong phase, and frequency abnormalities in the input power, the monitoring module will not control the relay KA to switch, i.e. the relay KA is not controlled at this time.

[0136] It should be noted that when the monitoring module is in automatic mode (i.e. normal monitoring state), the contacts (pins) on the monitoring units J1, J2, J3, J4 can collect voltage, current, frequency, etc. information of the input power, and after the monitoring module judges, it further controls the coil of the relay KA to get power or lose power, thereby controlling the switching of the mains I and mains II.

[0137] It should be noted that the monitoring module provides perfect monitoring, control and protection functions for the railway communication power supply system.

[0138] In order to more clearly understand the utility model, the working principle of the AC switching device is introduced below.

[0139] I. The coil contact points A1 and A2 of the contactor 1KM are controlled through the changeover switch SA1 and SA2, the contacts of the relay KA and the contacts of the contactor 2KM.

[0140] The specific control principle is that when the changeover switch SA2 is in the manual position (i.e. the left 45° position), the contact points (i.e. pins) 11 and 12 of the changeover switch SA2 are in the normally closed position, the contact points (i.e. pins) 23 and 24 of the changeover switch SA2 are in the normally open position, and the contact points (i.e. pins) 61 and 62 of the contactor 2KM are in the normally closed position. At this time, when the rotary changeover switch SA1 is in the mains I position (i.e. the left 45° position), the contact points (i.e. pins) 13 and 14 of the changeover switch SA1 change from the normally open contact points to the normally closed contact points, the coil of the contactor 1KM is powered, and the contactor 1KM is attracted.

[0141] When the changeover switch SA2 is in the automatic position (i.e. the right 45° position), the contact points (i.e. pins) 11 and 12 of the changeover switch SA2 are in the normally open position, the contact points (i.e. pins) 23 and 24 of the changeover switch SA2 are in the normally closed position, and the contact points (i.e. pins, contacts) 61 and 62 of the contactor 2KM are in the normally closed position. At this time, if the monitoring module detects that the mains I power supply is normal, the contact points (i.e. pins) 1 and 9 and 2 and 10 of the relay KA are in the normally closed position, the coil of the contactor 1KM is powered, and the contactor 1KM is attracted.

[0142] II. The coil contact points A1 and A2 of the contactor 2KM are controlled through the changeover switch SA1 and SA2, the contacts of the relay KA and the contacts of the contactor 1KM.

[0143] The specific control principle is that when the changeover switch SA2 is in the manual position (i.e. the left 45° position), the contact points (i.e. pins) 31 and 32 of the changeover switch SA2 are in the normally closed position, the contact points (i.e. pins) 43 and 44 of the changeover switch SA2 are in the normally open position, and the contact points (i.e. pins) 61 and 62 of the contactor 1KM are in the normally closed position. At this time, when the rotary changeover switch SA1 is in the mains II position (i.e. the right 45° position), the contact points (i.e. pins) 23 and 24 of the changeover switch SA1 change from the normally open contact points to the normally closed contact points, the coil of the contactor 1KM is powered, and the contactor 1KM is attracted.

[0144] When the change-over switch SA2 is in the automatic position (i.e. the right 45° position), the contacts (i.e. pins) 11, 12 of the change-over switch SA2 are in the normally open position, the contacts (i.e. pins) 23, 24 of the change-over switch SA2 are in the normally closed position, the contacts (i.e. pins, contacts) 61, 62 of the contactor 2KM are in the normally closed position, at this time, if the monitoring module detects that the mains I power supply is abnormal and the mains II power supply is normal, the monitoring module controls the relay KA to be attracted, the contacts (i.e. pins, contacts) 7, 11 and 8, 12 of the relay KA are changed from the normally open contacts to the normally closed contacts, the coil of the contactor 2KM is powered, and the contactor 2KM is attracted;

[0145] Based on the input power supply switching circuit provided by the utility model, the utility model also provides a railway communication power supply system, which comprises the input power supply switching circuit and a plurality of railway communication devices.

[0146] The railway communication device is connected with the input power supply switching circuit.

[0147] The railway communication device is a power consumption device in the later stage of the input power supply switching circuit.

[0148] In order to more clearly understand the technical scheme of the utility model, the working principle of the utility model is described below by taking the working mode as an example.

[0149] I. Working mode when the circuit is powered for the first time

[0150] When the change-over switch SA2 is in the automatic state and the monitoring module is in the automatic mode (i.e. the normal monitoring state), when the two-way mains input power supply is sent to the railway communication power supply system, the circuit breakers QF1, QF2 are closed, the monitoring units J1, J2, J3, J4 of the monitoring module automatically detect overvoltage, undervoltage, open-phase and missing-phase of the input power supply, and whether the input power supply meets the requirements is judged by the monitoring module. The monitoring module controls the AC switching device to act through the relay KA, and outputs the power supply meeting the requirements to the railway communication device in the later stage. If both the two-way power supply meets the requirements, the I-way input power supply is selected for output, and the other way is standby (I-way priority).

[0151] For example, the power supply meeting the requirements is: the input voltage meets AC 380 V (-20%~+20%), and the frequency meets 50 Hz±5 Hz.

[0152] II. Working mode of automatic switching of the input power supply from the mains I input power supply to the mains II input power supply

[0153] When both power grids (i.e. the Ith power input source and the IIth power input source) are normal, the AC switching device works at the Ith power source. If any fault occurs in the Ith power input source, such as over-voltage, power failure, phase loss, etc., the Ith voltage and current information collected by the monitoring units J1 and J2 exceeds the set alarm value, the monitoring module controls the contact (CON-7, NO-7) of the port J24 to be connected, the relay KA coil is powered and attracted, the normally closed contacts 1-9 and 2-10 are disconnected, the normally open contacts 7-11 and 8-12 are connected, the coil of the contactor 1KM in the AC switching device loses power, the auxiliary normally closed contact 61-62 of the contactor 1KM is closed, at this time the coil of the contactor 2KM in the AC switching device is powered, the contactor 2KM is attracted and switched to the IIth power source.

[0154] Similarly, when the IIth power source fails, the same action process occurs.

[0155] III. Manual switching of the input power from the Ith power input source to the IIth power input source

[0156] When manual switching is required (at this time the Ith and IIth power input sources should be normal), the switching can be directly operated through the switch SA1.

[0157] When the Ith power input source works, if it is required to switch to the IIth power input source, the switch SA2 can be placed in the "manual" position, the contacts 11-12 and 31-32 of the switch SA2 are connected, the contacts 23-24 and 43-44 are disconnected, the switch SA1 is rotated to the "IIth power" position (i.e. the right 45° position), at this time the contacts 13-14 of the switch SA1 are disconnected, the contacts 23-24 are connected, the coil of the contactor 1KM in the AC switching device loses power, the auxiliary normally closed contact 61-62 of the contactor 1KM is closed, the coil of the contactor 2KM in the AC switching device is powered, the contactor 2KM is attracted, at this time the input power is switched from the Ith power input source to the IIth power input source.

[0158] IV. Manual control by the monitoring module to switch the input power from the Ith power input source to the IIth power input source

[0159] When the manual switching is made through the monitoring module, the change-over switch SA2 is set to the "automatic" position, the monitoring module is in the "manual" mode, the "AC input selection" of the monitoring module is set to "AC2", at this time the monitoring module controls the contact (CON-7, NO-7) of the port J24 thereon to be connected, the relay KA coil is attracted, the normally closed contacts 1-9, 2-10 of the relay KA are disconnected, the normally open contacts 7-11, 8-12 are connected, the coil of the contactor 1KM in the AC switching device is de-energized, the auxiliary normally closed contact 61-62 of the contactor 1KM is closed, at this time the coil of the contactor 2KM in the AC switching device is energized, the contactor 2KM is attracted and switched to the II route power supply.

[0160] V. The working mode of manually switching the input power supply from the II route mains input power supply to the I route mains input power supply

[0161] When the II route mains input power supply is working, if it is needed to switch to the I route mains input working, the change-over switch SA2 is set to the "manual" position, the contacts 11-12, 31-32 of the change-over switch SA2 are connected, the contacts 23-24, 43-44 are disconnected, the change-over switch SA1 is rotated to "mains I" (i.e. the left 45° position), at this time the contacts 13-14 of the change-over switch SA1 are connected, the contact 23-24 is disconnected, the coil of the contactor 2KM in the AC switching device is de-energized, the auxiliary normally closed contact 61-62 of the contactor 2KM is closed, the coil of the contactor 1KM in the AC switching device is energized, the contactor 1KM is attracted, at this time the input power supply is switched from the II route mains input power supply to the I route mains input power supply.

[0162] VI. The working mode of manually switching the input power supply from the II route mains input power supply to the I route mains input power supply through the monitoring module

[0163] When the manual switching is made through the monitoring module, the change-over switch SA2 is set to the "automatic" position, the monitoring module is in the "manual" mode, the working mode is set to "AC1 working mode" through the "AC input selection" manual switching function of the monitoring module, at this time the contact (CON-7, NO-7) of the port J24 of the monitoring module is disconnected, the relay KA coil is not actuated, the normally closed contacts 1-9, 2-10 of the relay KA are connected, the normally open contacts 7-11, 8-12 are disconnected, the coil of the contactor 2KM in the AC switching device is de-energized, the auxiliary normally closed contact 61-62 of the contactor 2KM is closed, at this time the coil of the contactor 1KM in the AC switching device is energized, the contactor 1KM is attracted and switched to the I route power supply.

[0164] VII. The working mode of connecting the power supply of the generator F

[0165] When the input of the generator F power supply is needed, the output cable of the generator is directly connected to the input end of the circuit breaker QF4, when the generator works normally, the circuit breaker QF3 can be disconnected, the mechanical interlocking device is moved to the position where the circuit breaker QF4 can be closed, at this time, the circuit breaker QF4 can be closed, and the power supply is provided by the generator.

[0166] Through verification, the circuit provided by the utility model mainly uses low-voltage electrical components, is modularly designed, is stable in work, is high in reliability, is low in failure rate, and can be reliably applied to railway communication power supply system equipment.

[0167] Compared with the prior art, the input power supply switching circuit and the railway communication power supply system have the following beneficial effects:

[0168] The utility model not only can access two-way input power supply, but also can carry out remote switching and access of two-way input power supply.

[0169] 2、Based on the utility model, not only the manual and automatic switching can be realized, but also the switching of two-way power supply can be remotely controlled, has no independent generator power supply access interface, when the input of the generator F power supply is needed, when the generator works normally, the circuit breaker of the commercial power supply is disconnected, and the risk of power failure of the rear-end power consumption equipment does not exist.

[0170] It should be noted that this power failure risk is: in the unattended communication station, when two-way input power supply simultaneously exists problem in the extreme case, when the temporary input of the generator is needed, if there is no separate generator interface, all input circuit breakers need to be disconnected and the wiring of one-way power supply needs to be removed to access the generator, even if the power supply is restored, the original wiring also needs to be disconnected to restore; and when the power supply needs to be powered off for maintenance, if the maintenance personnel cannot manually switch in time, and the detection loop of the automatic switching exists problem, the communication power supply system will have no input power supply, once the battery is completely discharged, the railway communication equipment will be instantaneously powered off, which may cause the train in operation to stop and other unpredictable situations, which is not allowed by the railway company.

[0171] The above-mentioned is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled personnel in the technical field, on the premise of not departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. An input power switching circuit, characterized by comprising: The utility model relates to an alternating current switching device, circuit breaker QF1~QF4 and change-over switch SA1~SA2. The input end of circuit breaker QF1 and QF2 is connected with two-way alternating current input power source correspondingly. Two-way alternating current input power source includes I-way city electricity input power source and II-way city electricity input power source. The output end of circuit breaker QF1 and QF2 is connected with circuit breaker QF3 through alternating current switching device. Alternating current switching device is used to switch two-way alternating current input power source into one-way alternating current power source and then connect circuit breaker QF3. The output end of circuit breaker QF3 is connected with the power supply input end of the later stage power equipment. The input end of circuit breaker QF4 is connected with the output end of generator F power source. The output end of circuit breaker QF4 is connected with the power supply input end of the later stage power equipment. The 1st, 3rd and 5th pins of the input end of circuit breaker QF1 are connected with the A, B and C phase power lines of I-way city electricity input power source respectively.

2. The input power switching circuit of claim 1, wherein, The 1st, 3rd and 5th pins of the input end of circuit breaker QF2 are connected with the A, B and C phase power lines of II-way city electricity input power source respectively. Alternating current switching device includes contactor 1KM~2KM.

3. The input power switching circuit of claim 1, wherein, The output end of circuit breaker QF1 and QF2 is connected with contactor 1KM and contactor 2KM in alternating current switching device respectively. The 2nd, 4th and 6th pins of the output end of circuit breaker QF1 are connected with the 1L1, 3L2 and 5L3 pins of 1KM contactor in alternating current switching device through alternating current transformer 1JC, 2JC and 3JC respectively.

4. The input power switching circuit of claim 3, wherein, The 2nd, 4th and 6th pins of the output end of circuit breaker QF2 are connected with the 1L1, 3L2 and 5L3 pins of 2KM contactor in alternating current switching device through alternating current transformer 4JC, 5JC and 6JC respectively. The output end of contactor 1KM and 2KM in alternating current switching device is connected with the input end of circuit breaker QF3 after convergence.

5. The input power switching circuit of claim 1, wherein, The 1st, 3rd and 5th pins of the input end of circuit breaker QF4 are connected with the A, B and C phase power lines of generator F power source. The 2nd, 4th and 6th pins of the output end of circuit breaker QF4 are connected with the 2nd, 4th and 6th pins of the output end of circuit breaker QF3 after convergence and then connected with the later stage power equipment to supply power to the later stage power equipment. For alternating current switching device, the 62nd pin of contactor 2KM is connected with the 1L1 pin of contactor 1KM.

6. The input power switching circuit of any one of claims 1 to 5, wherein, The 61st pin of contactor 2KM is connected with the coil contact point A2 of contactor 1KM. The coil contact point A1 of contactor 1KM is connected with the 13th pin of change-over switch SA1 and the 10th pin of relay 1KA respectively. The 14th pin of change-over switch SA1 is connected with the 11th pin of change-over switch SA2. The 2nd pin of relay KA is connected with the 23rd pin of change-over switch SA2. The 24th pin of change-over switch SA2 is connected with the 9th pin of relay KA. The 1st pin of relay KA is connected with the 12th pin of change-over switch SA2. For alternating current switching device, the 62nd pin of contactor 1KM is connected with the 1L1 pin of contactor 2KM. The 61st pin of contactor 1KM is connected with the coil contact point A2 of contactor 2KM. ​ The coil contact A1 of the contactor 2KM is connected with the 23th pin of the change-over switch SA1 and the 12th pin of the relay KA respectively; The 24th pin of the change-over switch SA1 is connected with the 31th pin of the change-over switch SA2; The 8th pin of the relay KA is connected with the 43th pin of the change-over switch SA2; The 44th pin of the change-over switch SA2 is connected with the 11th pin of the relay KA; The 7th pin of the relay KA is connected with the 32th pin of the change-over switch SA2.

7. The input power switching circuit of claim 6, wherein, The 12th pin of the change-over switch SA2 is connected with the N phase line of any one of the two AC input power sources; The 32th pin of the change-over switch SA2 is connected with the N phase line of any one of the two AC input power sources.

8. The input power switching circuit of any one of claims 1 to 5, wherein, Further comprising: a monitoring module; The monitoring module is connected with the relay KA, the AC switching device, and the AC transformers 1JC, 2JC, 3JC, 4JC, 5JC and 6JC respectively.

9. The input power switching circuit of claim 8, wherein, The monitoring module comprises monitoring units J1~J4; The 1st pin of the monitoring unit J1 is connected with the 1L1 pin of the contactor 1KM in the AC switching device; The 3rd pin of the monitoring unit J1 is connected with the 3L2 pin of the contactor 1KM in the AC switching device; The 5th pin of the monitoring unit J1 is connected with the 5L3 pin of the contactor 1KM in the AC switching device; The 7th pin of the monitoring unit J1 is connected with the N phase line of the Ith power input source; The 1st pin of the monitoring unit J2 is connected with the 1st pin of the AC transformer 1JC of the Ith power input source; The 2nd pin of the monitoring unit J2 is connected with the 2nd pin of the AC transformer 1JC of the Ith power input source; The 3rd pin of the monitoring unit J2 is connected with the 1st pin of the AC transformer 2JC of the Ith power input source; The 4th pin of the monitoring unit J2 is connected with the 2nd pin of the AC transformer 2JC of the Ith power input source; The 5th pin of the monitoring unit J2 is connected with the 1st pin of the AC transformer 3JC of the Ith power input source; The 6th pin of the monitoring unit J2 is connected with the 2nd pin of the AC transformer 3JC of the Ith power input source; The 1st pin of the monitoring unit J3 is connected with the 1L1 pin of the contactor 2KM in the AC switching device; The 3rd pin of the monitoring unit J3 is connected with the 3L2 pin of the contactor 2KM in the AC switching device; The 5th pin of the monitoring unit J3 is connected with the 5L3 pin of the contactor 2KM in the AC switching device; The 7th pin of the monitoring unit J3 is connected with the N phase line of the IIth power input source; The 1st pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 4JC of the IIth power input source; The 2nd pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 4JC of the IIth power input source; The 3rd pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 5JC of the IIth power input source; The 4th pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 5JC of the II-way input power supply; The 5th pin of the monitoring unit J4 is connected with the 1st pin of the AC transformer 6JC of the II-way input power supply; The 6th pin of the monitoring unit J4 is connected with the 2nd pin of the AC transformer 6JC of the II-way input power supply; The +12V pin of the CON4 port of the monitoring module is connected with the 14th pin of the relay KA; The -12V pin of the CON4 port of the monitoring module is connected with the CON-7 pin of the J24 port of the monitoring module; The NO-7 pin of the J24 port of the monitoring module is connected with the 13th pin of the relay KA.

10. A railway communication power supply system characterized by comprising: The input power supply switching circuit as claimed in any one of claims 1 to 9, and a plurality of railway communication devices; The railway communication device is connected with the input power supply switching circuit; The railway communication device is a power consumption device in the rear stage of the input power supply switching circuit.

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