A comprehensive input test bench for power supply panels

Abstract

The present invention discloses a comprehensive input test bench for a power supply panel, which is characterized by comprising: a first power input terminal Uin1 and a second power input terminal Uin2 for connecting to an external power grid; a first power output terminal Uout1 and a second power output terminal Uout2 for connecting to the first power input terminal and the second power input terminal of the power supply panel; wherein, the live wire terminal of the first power input terminal Uin1 is sequentially connected to a three-phase circuit breaker QF11, an automatic voltage regulator TYQ1, a three-phase circuit breaker QF12, and a contactor KM11; the live wire terminal of the second power input terminal Uin2 is sequentially connected to a three-phase circuit breaker QF21, a manual voltage regulator TYQ2, a three-phase circuit breaker QF22, and a contactor KM21; the present invention can realize the detection functions of overvoltage, undervoltage, phase error, and open phase of the input power supply of the power supply panel through different functional modules, which has great practical significance.

Description

Technical Field

[0001] The present invention relates to the technical field of railway power supply panels, and particularly to an integrated input test bench for a power supply panel. Background Art

[0002] A power supply panel is a power supply device used in the railway industry. According to the series standard requirements of railway signal power supply system equipment stipulated in the Railway Industry Standard TB / T1528 of the People's Republic of China, the power supply panel should ensure stable power supply when the input voltage is three-phase AC 380V +57 - 76V, and should also have functions such as three-phase power outage, phase break, and phase sequence protection.

[0003] In order to test the functions of the power supply panel, the current existing main test methods are mainly as follows:

[0004] First, in order to adjust the magnitude of the voltage input to the power supply panel, an induction voltage regulator is usually set up in the commissioning area of the electrical installation workshop. The output voltage range of the induction voltage regulator is manually adjusted entirely by turning the handwheel, and an external instrument needs to be connected for monitoring, which is not convenient to operate and has potential safety hazards.

[0005] Second, in order to test the functions of three-phase power outage, phase break, and phase sequence protection of the three-phase power supply (i.e., as the input power supply) of the power supply panel, the existing connection circuit is simply designed and has certain potential safety hazards.

[0006] Third, in order to test different functions, different function test instruments need to be used. Since the various function test instruments are not integrated, before the overall commissioning and factory inspection of the power supply panel, it is necessary to borrow and reconnect the circuit, which is not convenient to operate and affects the production progress.

[0007] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the Invention

[0008] The purpose of the present invention is to provide an integrated input test bench for a power supply panel in view of the technical defects existing in the prior art.

[0009] To this end, the present invention provides an integrated input test bench for a power supply panel, including a first power input terminal Uin1 and a second power input terminal Uin2, as well as a first power output terminal Uout1 and a second power output terminal Uout2;

[0010] Among them, the first power input terminal Uin1 and the second power input terminal Uin2 are used to connect to an external power grid;

[0011] The first power output terminal Uout1 and the second power output terminal Uout2 are used to connect to the first power input terminal and the second power input terminal of the power supply panel serving as the device under test;

[0012] For the first power input terminal Uin1, the live wire terminal of the first power input terminal Uin1 is successively connected to the three-phase circuit breaker QF11, the automatic voltage regulator TYQ1, the three-phase circuit breaker QF12, and the contactor KM11;

[0013] A contactor KM12 is connected in parallel with the contactor KM11;

[0014] The three-phase power output terminals of the contactor KM11 are respectively connected to one end of the disconnecting switch QS11, one end of the disconnecting switch QS12, and one end of the disconnecting switch QS13;

[0015] The other ends of the disconnecting switch QS11, the disconnecting switch QS12, and the disconnecting switch QS13 are connected to the live wire terminal of the first power input of the power supply panel serving as the device under test through the first set of connection terminals DZ1;

[0016] For the second power input terminal Uin2, the live wire terminal of the second power input terminal Uin2 is successively connected to the three-phase circuit breaker QF21, the manual voltage regulator TYQ2, the three-phase circuit breaker QF22, and the contactor KM21;

[0017] A contactor KM22 is connected in parallel with the contactor KM21;

[0018] The three-phase power output terminals of the contactor KM21 are respectively connected to one end of the disconnecting switch QS21, one end of the disconnecting switch QS22, and one end of the disconnecting switch QS23;

[0019] The other ends of the disconnecting switch QS21, the disconnecting switch QS22, and the disconnecting switch QS23 are connected to the live wire terminal of the second power input of the power supply panel serving as the device under test through the second set of connection terminals DZ2.

[0020] Preferably, the neutral wire terminal of the first power input terminal Uin1 is connected to the neutral wire terminal of the first power input of the power supply panel serving as the device under test through the first set of connection terminals DZ1;

[0021] The other ends of the disconnecting switch QS11, the disconnecting switch QS12, and the disconnecting switch QS13 are also connected to the three live wire terminals of the power socket GZ1;

[0022] The neutral wire terminal of the first power input terminal Uin1 is also connected to the neutral wire terminal of the power socket GZ1.

[0023] Preferably, a phase sequence protector XQ1 is also connected to the three-phase connection line between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1.

[0024] Preferably, port 11 of the phase sequence protector XQ1 is connected to two input terminals of a rotary switch SA11;

[0025] Two output terminals of the rotary switch SA11 are respectively connected to one end of an indicator light HL11 and one end of an indicator light HL12;

[0026] The other ends of the indicator light HL11 and the indicator light HL12 are respectively connected to one end of a normally closed button K12 and one end of a normally closed button K11;

[0027] After the other ends of the normally closed button K12 and the normally closed button K11 are joined together by current confluence, they are connected to port 21 of the phase sequence protector XQ1.

[0028] Preferably, on each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12, a voltage meter PV11, a voltage meter PV12, and a voltage meter PV13 are respectively connected;

[0029] On each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12, an ammeter PA11, an ammeter PA12, and an ammeter PA13 are also respectively connected;

[0030] On the ammeters PA11, PA12, and PA13, current transformers TA11, TA12, and TA13 are respectively connected in series.

[0031] Preferably, the neutral line terminal of the second power input terminal Uin2 is connected, through a second set of wiring terminals DZ2, to the neutral line terminal of the second power input of the power supply panel serving as the equipment under test;

[0032] The other ends of the disconnecting switch QS21, the disconnecting switch QS22, and the disconnecting switch QS23 are also connected to the three live wire terminals of the power socket GZ2;

[0033] The neutral line terminal N of the second power input terminal Uin1 is also connected to the neutral line terminal of the power socket GZ2;

[0034] On the three-phase connection line between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2, a phase sequence protector XQ2 is also connected.

[0035] Preferably, port 11 of the phase sequence protector XQ2 is connected to two input terminals of a rotary switch SA21;

[0036] Two output terminals of the rotary switch SA21 are respectively connected to one end of an indicator light HL21 and one end of an indicator light HL22;

[0037] The other ends of the indicating lamp HL21 and the indicating lamp HL22 are respectively connected to one end of the normally-closed button K22 and one end of the normally-closed button K21;

[0038] After the other ends of the normally-closed button K22 and the normally-closed button K21 are joined by confluence, they are connected to port 21 of the phase sequence protector XQ2.

[0039] Preferably, the live wires L1, L2, and L3 between the three-phase power input terminals U1, V1, and W1 of the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 are respectively connected to the three input terminals of the three-phase circuit breaker QF23;

[0040] The three output terminals of the three-phase circuit breaker QF23 are respectively connected to the three input terminals of the regulator motor M through the contactor KM23;

[0041] A contactor KM24 is connected in parallel on the contactor KM23;

[0042] The three-phase power output terminals U2, V2, and W2 of the manual voltage regulator TYQ2 are respectively connected to the terminal blocks U, V, and W of the regulator motor M;

[0043] Preferably, a voltmeter PV21, a voltmeter PV22, and a voltmeter PV23 are respectively connected in each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22;

[0044] An ammeter PA21, an ammeter PA22, and an ammeter PA23 are also respectively connected in each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22;

[0045] Current transformers TA21, TA22, and TA23 are respectively connected in series on the ammeters PA21, PA22, and PA23.

[0046] Preferably, four power sockets XS1, XS2, XS3, and XS4 are also connected between the live wire end L3 and the neutral wire end N of the first power input terminal Uin1;

[0047] The four power sockets XS1, XS2, XS3, and XS4 are connected in parallel with each other;

[0048] The first power output terminal and the second power output terminal of the power supply panel serving as the device under test are connected to the input terminal of a probe power supply unit;

[0049] This probe power supply unit is used to connect to the probe of an oscilloscope.

[0050] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a comprehensive input test bench for a power supply panel, whose structural design is scientific. It can realize the detection functions of overvoltage, undervoltage, phase error and phase break of the input power supply (i.e., three-phase power supply) of the power supply panel through different functional modules, which has great practical significance.

[0051] In addition, the comprehensive input test bench for a power supply panel provided by the present invention can simulate and provide the input power supply conditions for the overall commissioning and factory inspection of the power supply panel stipulated in the railway industry standard TB / T 1528 of our country. Without manual adjustment, it can significantly reduce the labor intensity of the staff.

[0052] In addition, the comprehensive input test bench for a power supply panel provided by the present invention can also measure the conversion time of the two-way input power supply of the power supply panel, better meeting the functional requirements of the factory test of the power supply panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is the overall circuit schematic diagram of a comprehensive input test bench for a power supply panel provided by the present invention;

[0054] Figure 2 It is the circuit block diagram of an embodiment of a comprehensive input test bench for a power supply panel provided by the present invention;

[0055] Figure 3 It is the schematic diagram for verifying the automatic conversion function of the two-way input power supply in the present invention;

[0056] Figure 4 It is the schematic diagram for verifying the overvoltage and undervoltage protection functions of the two-way power supply in the present invention;

[0057] Figure 5 It is the schematic diagram for verifying the phase break protection function of the input power supply in the present invention;

[0058] Figure 6 It is the schematic diagram for verifying the phase error protection function of the input power supply in the present invention;

[0059] Figure 7 It is the schematic diagram of the monitoring interface for the conversion time of the two-way input power supply in the present invention;

[0060] Figure 8 It is the schematic diagram of the monitoring interface for the external power grid power in the present invention;

[0061] Figure 9 It is the schematic diagram of the voltage and current display function in the present invention;

[0062] Figure 10 It is the schematic diagram of the external view of the cabinet layout of an embodiment in the present invention;

[0063] Figure 11 In the present invention, it is a schematic diagram of the appearance of the cabinet layout in another embodiment. Detailed implementation manners

[0064] To make the technical means implemented by the present invention easier to understand, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant application, rather than limiting the application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the convenience of description.

[0065] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0066] It should be noted that in the description of the present application, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0067] In addition, it should be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms such as "installation" should be understood in a broad sense. For example, it can be fixedly installed or detachably installed.

[0068] For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0069] Refer to Figures 1 to 11 , the present invention provides a power supply panel input comprehensive test bench, which is used as the front-end test equipment of the power supply panel. Specifically, it includes two power input terminals, namely the first power input terminal Uin1 and the second power input terminal Uin2, and two power output terminals, namely the first power output terminal Uout1 and the second power output terminal Uout2;

[0070] Among them, the first power input terminal Uin1 and the second power input terminal Uin2, as the input terminals of the power supply panel input comprehensive test bench, are used to connect to an external power grid (such as the distribution box of an external three-phase AC power grid);

[0071] The first power output terminal Uout1 and the second power output terminal Uout2, as the output terminals of the power supply panel input comprehensive test bench, are used to connect to the first power input terminal and the second power input terminal of the power supply panel serving as the device under test.

[0072] In the present invention, in terms of specific implementation, the power supply panel serving as the device under test is an existing railway signal power supply panel. For example, it can be a PKZ-type railway signal power supply panel produced by Tianjin Railway Signal Co., Ltd. The comprehensive test bench of the present invention can be used to test the overvoltage, undervoltage, phase error, phase break, power quality monitoring of the input power supply of the whole railway signal power supply panel, and the switching time of two input power supplies.

[0073] In the present invention, in terms of specific implementation, refer to Figure 1 As shown, for the first power input terminal Uin1, the live wire terminals (including three-phase live wires L1, L2, and L3) of the first power input terminal Uin1 are successively connected to the three-phase circuit breaker QF11, the automatic voltage regulator TYQ1, the three-phase circuit breaker QF12, and the contactor KM11.

[0074] A contactor KM12 is connected in parallel with the contactor KM11.

[0075] The three-phase power output terminals of the contactor KM11 are respectively connected to one end of the disconnecting switch QS11, one end of the disconnecting switch QS12, and one end of the disconnecting switch QS13.

[0076] The other ends of the disconnecting switch QS11, the disconnecting switch QS12, and the disconnecting switch QS13 are connected to the live wire terminals (including three-phase live wires L1, L2, and L3) of the first power input of the power supply panel serving as the device under test through the first set of wiring terminals DZ1.

[0077] In terms of specific implementation, the neutral wire terminal (i.e., the N wire) of the first power input terminal Uin1 is connected to the neutral wire terminal (i.e., the N wire) of the first power input of the power supply panel serving as the device under test through the first set of wiring terminals DZ1.

[0078] In terms of specific implementation, the other ends of the disconnecting switch QS11, the disconnecting switch QS12, and the disconnecting switch QS13 are also connected to the three live wire terminals (i.e., the A, B, and C terminals) of the power socket GZ1.

[0079] The neutral wire terminal N (i.e., the N wire) of the first power input terminal Uin1 is also connected to the neutral wire terminal (i.e., the N terminal) of the power socket GZ1.

[0080] In terms of specific implementation, a phase sequence protector XQ1 is also connected to the three-phase connection line between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1.

[0081] Specifically: the live wire L1 between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1 is connected to the port 3 of the phase sequence protector XQ1.

[0082] The live wire L2 between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1 is connected to port 4 of the phase sequence protector XQ1;

[0083] The live wire L3 between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1 is connected to port 11 of the phase sequence protector XQ1;

[0084] The neutral wire end (i.e., the N wire) of the first power input terminal Uin1 is connected to port 21 of the phase sequence protector XQ1;

[0085] Port 12 and port 22 of the phase sequence protector XQ1 are directly connected.

[0086] In specific implementation, contactors KM11 and KM12 are respectively used to connect to the positive phase sequence and the negative phase sequence;

[0087] Among them, port 11 of the phase sequence protector XQ1 is connected to two input terminals of a rotary switch SA11;

[0088] The two output terminals of the rotary switch SA11 are respectively connected to one end of the indicator light HL11 and one end of the indicator light HL12;

[0089] The other ends of the indicator light HL11 and the indicator light HL12 are respectively connected to one end of the normally closed button K12 and one end of the normally closed button K11;

[0090] After the other ends of the normally closed button K12 and the normally closed button K11 converge and intersect, they are connected to port 21 of the phase sequence protector XQ1.

[0091] In specific implementation, the indicator light HL11 and the indicator light HL12 are respectively connected in parallel with the contactor coil X11 and the contactor coil X12;

[0092] In specific implementation, on each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12, a voltmeter PV11, a voltmeter PV12, and a voltmeter PV13 are respectively connected;

[0093] On each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12, an ammeter PA11, an ammeter PA12, and an ammeter PA13 are also respectively connected;

[0094] On the ammeters PA11, PA12, and PA13, current transformers TA11, TA12, and TA13 are respectively connected in series.

[0095] In the present invention, in specific implementation, refer to Figure 1As shown in the figure, for the second power input terminal Uin2, the live wire terminals of the second power input terminal Uin2 (including the three-phase live wires L1, L2, and L3) are successively connected to the three-phase circuit breaker QF21, the manual voltage regulator TYQ2, the three-phase circuit breaker QF22, and the contactor KM21;

[0096] A contactor KM22 is connected in parallel with the contactor KM21;

[0097] The three-phase power output terminals of the contactor KM21 are respectively connected to one end of the disconnecting switch QS21, one end of the disconnecting switch QS22, and one end of the disconnecting switch QS23;

[0098] The other ends of the disconnecting switch QS21, the other ends of the disconnecting switch QS22, and the other ends of the disconnecting switch QS23 are connected to the live wire terminals (including the three-phase live wires L1, L2, and L3) of the second power input terminal of the power supply panel serving as the equipment under test through the second set of wiring terminals DZ2;

[0099] Specifically, the neutral wire terminal (i.e., the N wire) of the second power input terminal Uin2 is connected to the neutral wire terminal (i.e., the N wire) of the second power input terminal of the power supply panel serving as the equipment under test through the second set of wiring terminals DZ2.

[0100] Specifically, the other ends of the disconnecting switch QS21, the other ends of the disconnecting switch QS22, and the other ends of the disconnecting switch QS23 are also connected to the three live wire terminals (i.e., the A, B, and C terminals) of the power socket GZ2;

[0101] The neutral wire terminal N (i.e., the N wire) of the second power input terminal Uin1 is also connected to the neutral wire terminal (i.e., the N terminal) of the power socket GZ2.

[0102] Specifically, a phase sequence protector XQ2 is also connected to the three-phase connection line between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2.

[0103] Specifically: The live wire L1 between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 is connected to port 3 of the phase sequence protector XQ2;

[0104] The live wire L2 between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 is connected to port 4 of the phase sequence protector XQ2;

[0105] The live wire L3 between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 is connected to port 11 of the phase sequence protector XQ2;

[0106] The neutral wire terminal (i.e., the N wire) of the second power input terminal Uin1 is connected to port 21 of the phase sequence protector XQ2;

[0107] The ports 12 and 22 of the phase sequence protector XQ2 are directly connected.

[0108] Specifically, the contactors KM21 and KM22 are respectively used to connect to the positive phase sequence and the negative phase sequence;

[0109] Among them, the port 11 of the phase sequence protector XQ2 is connected to the two input ends of a rotary switch SA21;

[0110] The two output ends of the rotary switch SA21 are respectively connected to one end of the indicator light HL21 and one end of the indicator light HL22;

[0111] The other ends of the indicator light HL21 and the indicator light HL22 are respectively connected to one end of the normally closed button K22 and one end of the normally closed button K21;

[0112] After the other ends of the normally closed button K22 and the normally closed button K21 are joined together by confluence, they are connected to the port 21 of the phase sequence protector XQ2.

[0113] Specifically, the indicator light HL21 and the indicator light HL22 are respectively connected in parallel with the contactor coils X21 and X22;

[0114] Specifically, the port 11 of the phase sequence protector XQ2 is respectively connected to one end of the boost button SB21 and one end of the step-down button SB22;

[0115] The other ends of the boost button SB21 and the step-down button SB22 are respectively connected to one end of the indicator light HL23 and one end of the indicator light HL24;

[0116] After the other ends of the indicator light HL23 and the indicator light HL24 are joined together by confluence, they are connected to the port 21 of the phase sequence protector XQ2.

[0117] Specifically, the indicator light HL23 and the indicator light HL24 are respectively connected in parallel with the contactor coils X23 and X24;

[0118] Specifically, the live wires L1, L2, and L3 between the three-phase power input ends U1, V1, and W1 of the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 are respectively connected to the three input ends of the three-phase circuit breaker QF23;

[0119] The three output ends of the three-phase circuit breaker QF23 are respectively connected to the three input ends (U, V, and W terminals) of the regulator motor M through the contactor KM23;

[0120] The contactor KM24 is connected in parallel with the contactor KM23;

[0121] The three-phase power output terminals U2, V2, and W2 of the manual voltage regulator TYQ2 are respectively connected to the terminal blocks U, V, and W of the regulator motor M.

[0122] It should be noted that the three-phase power input terminals of the manual voltage regulator TYQ2 are U1, V1, and W1, and the output terminals are U2, V2, and W2. The terminals are the terminal blocks of the device and are used for connecting wires.

[0123] Specifically, on each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22, a voltmeter PV21, a voltmeter PV22, and a voltmeter PV23 are respectively connected.

[0124] On each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22, an ammeter PA21, an ammeter PA22, and an ammeter PA23 are also respectively connected.

[0125] Current transformers TA21, TA22, and TA23 are respectively connected in series on the ammeters PA21, PA22, and PA23.

[0126] In the present invention, specifically, as shown in Figure 1 , between the live wire terminal L1 and the neutral wire terminal N of the first power input terminal Uin1, an indicator sub-circuit is also connected.

[0127] The indicator sub-circuit includes switches K1 and K2 and an indicator lamp HL2.

[0128] The switch K1 and the indicator lamp HL1 are connected in series to form a first branch.

[0129] One end of the first branch is connected to the live wire terminal L1 of the first power input terminal Uin1, and the other end is connected to the neutral wire terminal N of the first power input terminal Uin1; the switch K2 and the indicator lamp HL2 are connected in series to form a second branch.

[0130] The second branch is connected in parallel with the first branch.

[0131] In the present invention, specifically, as shown in Figure 1 , between the live wire terminal L3 and the neutral wire terminal N of the first power input terminal Uin1, four power sockets XS1, XS2, XS3, and XS4 are also connected.

[0132] The four power sockets XS1, XS2, XS3, and XS4 are connected in parallel with each other.

[0133] In the present invention, specifically, as shown in Figure 1 , the first power output terminal and the second power output terminal of the power supply panel as the test device are connected to the input terminal of a probe power supply unit.

[0134] The probe power supply unit is used to connect to the probes of instruments such as oscilloscopes.

[0135] In the present invention, specifically, refer to Figure 10 and Figure 11 As shown, for the test bench of the present invention, it includes a cabinet body. On the cabinet body, various electronic components shown in the above circuit diagram can be installed. The positions of the specific external electronic components and indicator lights can be adjusted according to the needs of users.

[0136] To understand the technical solution of the present invention more clearly, the working principle of the present invention will be described below.

[0137] The input comprehensive test bench of the present invention can achieve the corresponding power supply panel function verification by operating different functional modules of the test bench. The present invention mainly includes the following seven aspects of test functions.

[0138] 1. Automatic conversion test function of two-way input power supplies.

[0139] Refer to Figure 3 As shown, three-phase circuit breakers are set for the two-way input power supplies of the test bench of the present invention. Disconnecting any one way can simulate a power outage. By applying the on-off function of the circuit breaker, the automatic conversion function verification of the two-way power supplies can be achieved.

[0140] 2. Overvoltage and undervoltage protection test function of two-way power supplies.

[0141] Refer to Figure 4 As shown, by applying the voltage regulation functions of the two voltage regulators, namely the automatic voltage regulator TYQ1 and the manual voltage regulator TYQ2, the overvoltage and undervoltage function verification of the two-way power supplies can be achieved.

[0142] Among them, the input power supply of the first path adopts a 100KVA automatic voltage regulator, and the voltage can be automatically regulated by the boost and buck buttons on the control panel of the voltage regulator;

[0143] Among them, the input power supply of the second path adopts the existing 63KVA three-phase induction voltage regulator in the electrical installation workshop. The forward and reverse rotations of the voltage regulator motor are controlled by contactors KM23 and KM24 and buttons to achieve the boost and buck functions.

[0144] In the present invention, specifically, the automatic voltage regulator TYQ1 adopts an existing automatic voltage regulator. For example, a 100KVA automatic voltage regulator produced by Eps Power Co., Ltd. can be adopted.

[0145] In the present invention, specifically, the manual voltage regulator TYQ2 adopts an existing manual voltage regulator, which is a device with mature existing technology.

[0146] 3. Broken-phase protection test function of input power supply.

[0147] See Figure 5 As shown, by using the on / off states of the disconnectors (QS11, QS12, QS13, QS21, QS22, QS123) and the alarm functions of the phase sequence protectors (XQ1 and XQ2), the verification of the open-phase protection function of the input power supply is realized. As Figure 5 shown, one disconnector is installed on each phase voltage of the two input power supplies to control the on / off of each phase; one phase sequence protector and one indicator light are installed on each input power supply to display the open-phase alarm of the power supply.

[0148] In the present invention, specifically, the phase sequence protectors XQ1 and XQ2 are existing phase sequence protectors. For example, they can be the BDS type input over- and under-voltage protectors XQ1 and XQ2 produced by Tianjin Railway Signal Co., Ltd.

[0149] It should be noted that in the present invention, see Figure 1 As shown, the ports 3, 11, 4, and 21 of the phase sequence protectors XQ1 and XQ2 serve as the power input terminals. The three-phase power supply wiring method is that 3 corresponds to phase A, 11 corresponds to phase B, 4 corresponds to phase C, and 21 corresponds to the N line. The ports 21 and 22 of the phase sequence protectors XQ1 and XQ2 are the phase sequence judgment interfaces. Short-circuiting the contacts of ports 12 and 22 enables the judgment of the phase sequence.

[0150] IV. Input power supply phase error protection test function.

[0151] See Figure 6 As shown, by using the control functions of the contactors (KM12, KM11, KM21, and KM22) and the alarm functions of the phase sequence protectors (XQ1 and XQ2), the verification of the phase error protection function of the input power supply D is realized. Two contactors are installed on each power supply, which are respectively connected to the positive phase sequence and the wrong phase sequence. The contactors and the rotary switch are used to control the positive phase sequence and the wrong phase sequence of the input power supply to simulate the phase error of the input power supply;

[0152] In addition, one phase sequence protector and one indicator light are installed on each power supply to display the phase error alarm of the power supply.

[0153] V. Conversion time monitoring interface function for two input power supplies.

[0154] See Figure 7 As shown, by using the power socket and the probe power supply unit (i.e., the probe tooling), the conversion time monitoring interface function for the two input power supplies of the power supply panel is realized.

[0155] Four rail-mounted power sockets (XS1, XS2, XS3, and XS4) are connected from the input power supply terminal and led to the test table for power supply to the test equipment. A probe tooling (i.e., probe power supply unit) can be designed with a power tab unit and an insulating base and led to the test table for connecting the probes of instruments such as oscilloscopes.

[0156] It should be noted that the power supply panel is provided with two input power supplies (the first path and the second path). Under normal conditions, the first path of power supply works. When the first path of power supply is powered off, the system will automatically switch to the second path of power supply. To ensure that the output of the power supply panel is not powered off, the switching time from the first path to the second path of power supply should not be greater than 0.15 s (standard requirement). This time is the switching time of the two input power supplies of the power supply panel (i.e., the switching time).

[0157] For the present invention, the test table of the present invention can realize the test of the switching time of the two input power supplies by applying the power sockets (XS1, XS2, XS3, and XS4), the probe tooling GZ1, and the oscilloscope. The specific operation process is as follows:

[0158] First, connect the output terminals 1D-11, 1D-12, 1D-13, 1D-14 of the test table of the present invention to the input terminals L1, L2, L3, N of the first path of power supply of the power supply panel, and connect the output terminals 2D-11, 2D-12, 2D-13, 2D-14 of the test table of the present invention to the input terminals L1, L2, L3, N of the second path of power supply of the power supply panel. In this way, the test of the present invention serves as the input end of the power supply panel and completes the electrical connection with the power supply panel. Operating this equipment can simulate various abnormal conditions of the input power supply of the power supply panel.

[0159] Then, lead two power lines from the unregulated standby output terminals of the power supply panel and connect them to the back of the L and N power tab units of the probe tooling GZ1. Clip the oscilloscope probe to the front of the L and N power tab units of the probe tooling GZ1. In this way, the test points can be led to the test table of the test table of the present invention through the probe tooling GZ1, which is convenient for testing. Then, plug the power cord of the oscilloscope into any one of the power sockets (XS1, XS2, XS3, and XS4) to power on the oscilloscope.

[0160] Next, close the main switch of the distribution box to supply power to the test bench and power supply panel of the present invention. After the power supply panel operates normally, disconnect the circuit breaker QF12 of the test bench of the present invention (used to simulate power failure or other abnormal conditions at the input of the power supply panel). At this time, the power supply panel will automatically switch from operating on the first input power supply to operating on the second input power supply. While disconnecting the circuit breaker, check the waveform on the oscilloscope. When the waveform on the oscilloscope changes, press the screenshot button to capture the current changing graph, and read and record the changing time on the waveform (the abscissa of the oscilloscope waveform is time, and the ordinate is the voltage amplitude). This time is the switching time between the two input power supplies (that is, the switching from the first input power supply to the second input power supply).

[0161] It should also be noted that the reason for measuring the switching time between the two input power supplies of the power supply panel is that according to the power supply panel standard TB / T1528.1-2018, the switching time between the two input power supplies of the power supply panel should not be greater than 0.15s. Before leaving the factory, the power supply panel must be tested for the switching time between the two input power supplies. Using the comprehensive test bench of the present invention to test the switching time between the two input power supplies can save the test preparation time and is more convenient and fast.

[0162] VI. Function of the external power grid power monitoring interface.

[0163] See Figure 8 As shown, use a power socket (or probe tooling) and terminal blocks to realize the function of the external power grid power monitoring interface. Use two groups of terminal blocks to bend the two input power supply lines into arcs and lead them to the test tabletop for convenient current testing.

[0164] VII. Function of voltage and current display.

[0165] See Figure 9 As shown, use a voltmeter, an ammeter, and a current transformer to realize the function of displaying the voltage and current of the two input power supplies. Each phase of the two input power supplies is connected to a 0.5-grade digital display voltmeter and ammeter, and the ammeter is equipped with a current transformer to display the voltage value and current value of each phase of the two input power supplies.

[0166] In summary, compared with the prior art, the input comprehensive test bench for a power supply panel provided by the present invention has a scientific structural design and can realize the detection functions of overvoltage, undervoltage, phase error, and phase break of the input power supply (i.e., three-phase power) of the power supply panel through different functional modules, which has great practical significance.

[0167] In addition, the input comprehensive test bench for a power supply panel provided by the present invention can simulate and provide the input power supply conditions for the whole machine debugging and factory inspection of the power supply panel specified in the railway industry standard TB / T 1528 of China. Without manual adjustment, it can significantly reduce the labor intensity of the staff.

[0168] In addition, the input comprehensive test bench for the power supply panel provided by the present invention can also measure the switching time of the two input power supplies of the power supply panel, better meeting the functional requirements of the factory test of the power supply panel.

[0169] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A comprehensive input test bench for a power supply panel, characterized in that, it includes a first power input terminal Uin1 and a second power input terminal Uin2, as well as a first power output terminal Uout1 and a second power output terminal Uout2; wherein, the first power input terminal Uin1 and the second power input terminal Uin2 are used to connect to an external power grid; the first power output terminal Uout1 and the second power output terminal Uout2 are used to connect to the first power input terminal and the second power input terminal of the power supply panel serving as the device under test; For the first power input terminal Uin1, the live wire terminal of the first power input terminal Uin1 is successively connected to a three-phase circuit breaker QF11, an automatic voltage regulator TYQ1, a three-phase circuit breaker QF12, and a contactor KM11; A contactor KM12 is connected in parallel on the contactor KM11; The three-phase power output terminals of the contactor KM11 are respectively connected to one end of an isolating switch QS11, one end of an isolating switch QS12, and one end of an isolating switch QS13; The other ends of the isolating switch QS11, the isolating switch QS12, and the isolating switch QS13 are connected to the live wire terminal of the first power input terminal of the power supply panel serving as the device under test through a first set of wiring terminals DZ1; For the second power input terminal Uin2, the live wire terminal of the second power input terminal Uin2 is successively connected to a three-phase circuit breaker QF21, a manual voltage regulator TYQ2, a three-phase circuit breaker QF22, and a contactor KM21; A contactor KM22 is connected in parallel on the contactor KM21; The three-phase power output terminals of the contactor KM21 are respectively connected to one end of an isolating switch QS21, one end of an isolating switch QS22, and one end of an isolating switch QS23; The other ends of the isolating switch QS21, the isolating switch QS22, and the isolating switch QS23 are connected to the live wire terminal of the second power input terminal of the power supply panel serving as the device under test through a second set of wiring terminals DZ2; Between the live wire L3 and the neutral wire terminal N of the first power input terminal Uin1, four power sockets XS1, XS2, XS3, and XS4 are also connected; The four power sockets XS1, XS2, XS3, and XS4 are connected in parallel with each other; The first power output terminal and the second power output terminal of the power supply panel serving as the device under test are connected to the input terminal of a probe power supply unit; This probe power supply unit is used to connect to the probe of an oscilloscope; The oscilloscope is connected to any one of the power sockets XS1, XS2, XS3, and XS4, and is used to obtain the conversion time of the two input power supplies, namely the first input power supply and the second input power supply of the power supply panel, by reading the voltage signal output from the second power output terminal of the power supply panel and the change time of the voltage signal waveform on the oscilloscope when the three-phase circuit breaker QF12 connected to the first power input terminal Uin1 is disconnected.

2. The comprehensive input test bench for a power supply panel according to claim 1, characterized in that, The neutral wire terminal of the first power input terminal Uin1 is connected to the neutral wire terminal of the first power input of the power supply panel serving as the device under test through the first set of wiring terminals DZ1; The other ends of the disconnecting switch QS11, the disconnecting switch QS12, and the disconnecting switch QS13 are also connected to the three live wire terminals of the power socket GZ1; The neutral wire terminal of the first power input terminal Uin1 is also connected to the neutral wire terminal of the power socket GZ1.

3. The power supply panel input comprehensive test bench according to claim 2, characterized in that, A phase sequence protector XQ1 is also connected to the three-phase connection line between the three-phase circuit breaker QF11 and the automatic voltage regulator TYQ1.

4. The power supply panel input comprehensive test bench according to claim 3, characterized in that, Port 11 of the phase sequence protector XQ1 is connected to the two input terminals of a rotary switch SA11; The two output terminals of the rotary switch SA11 are respectively connected to one end of the indicator light HL11 and one end of the indicator light HL12; The other ends of the indicator light HL11 and the indicator light HL12 are respectively connected to one end of the normally closed button K12 and one end of the normally closed button K11; After the other ends of the normally closed button K12 and the normally closed button K11 converge and intersect, they are connected to port 21 of the phase sequence protector XQ1.

5. The power supply panel input comprehensive test bench according to claim 1, characterized in that, Voltmeters PV11, PV12, and PV13 are respectively connected to each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12; Ammeters PA11, PA12, and PA13 are also respectively connected to each phase connection line between the automatic voltage regulator TYQ1 and the three-phase circuit breaker QF12; Current transformers TA11, TA12, and TA13 are respectively connected in series to the ammeters PA11, PA12, and PA13.

6. The power supply panel input comprehensive test bench according to claim 1, characterized in that, The neutral wire terminal of the second power input terminal Uin2 is connected to the neutral wire terminal of the second power input of the power supply panel serving as the device under test through the second set of wiring terminals DZ2; The other ends of the disconnecting switch QS21, the disconnecting switch QS22, and the disconnecting switch QS23 are also connected to the three live wire terminals of the power socket GZ2; The neutral wire terminal N of the second power input terminal Uin1 is also connected to the neutral wire terminal of the power socket GZ2; A phase sequence protector XQ2 is also connected to the three-phase connection line between the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2.

7. The power supply panel input comprehensive test bench according to claim 6, characterized in that, Port 11 of the phase sequence protector XQ2 is connected to the two input terminals of a rotary switch SA21; The two output terminals of the rotary switch SA21 are respectively connected to one end of the indicator light HL21 and one end of the indicator light HL22; The other ends of the indicator light HL21 and the indicator light HL22 are respectively connected to one end of the normally closed button K22 and one end of the normally closed button K21; The other end of the normally-closed button K22 and the other end of the normally-closed button K21 are joined by busbar intersection and then connected to port 21 of the phase sequence protector XQ2.

8. The power supply panel input comprehensive test bench according to claim 6, characterized in that, The live wires L1, L2, and L3 between the three-phase power input terminals U1, V1, and W1 of the three-phase circuit breaker QF21 and the manual voltage regulator TYQ2 are respectively connected to the three input terminals of the three-phase circuit breaker QF23; The three output terminals of the three-phase circuit breaker QF23 are respectively connected to the three input terminals of the regulator motor M through the contactor KM23; A contactor KM24 is connected in parallel on the contactor KM23; The three-phase power output terminals U2, V2, and W2 of the manual voltage regulator TYQ2 are respectively connected to the terminal blocks U, V, and W of the regulator motor M.

9. The power supply panel input comprehensive test bench according to claim 6, characterized in that, Voltmeters PV21, PV22, and PV23 are respectively connected in series on each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22; Ammeters PA21, PA22, and PA23 are also respectively connected in series on each phase connection line between the manual voltage regulator TYQ2 and the three-phase circuit breaker QF22; Current transformers TA21, TA22, and TA23 are respectively connected in series on the ammeters PA21, PA22, and PA23.

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