Shore electric connection dispatching box

Abstract

The utility model relates to the technical field of ship shore power systems, and especially relates to a shore power electrical adjusting box. Based on the existing ship shore power debugging requirements, the utility model provides a brand new debugging tool, makes up the blank of testing tools for the ship shore power system power receiving facilities, and achieves the purposes of simplifying debugging tasks, standardizing debugging work and maintaining personal safety on the premise of ensuring the debugging requirements of the ship shore power system power receiving facilities; according to the utility model, the dissipation resistor is creatively added to the circuit structure, so as to weaken the adverse effect generated by the distributed capacitance. In the analysis process, according to different cable types, parameters (resistance, power and the like) of the dissipation resistor are further designed and determined through calculation and simulation methods so as to cope with special application scenes such as cable material replacement and extra-long cables, and the universal applicability of the design is improved.

Description

Technical Field

[0001] This utility model relates to the field of ship shore power system technology, and in particular to a shore power commissioning box. Background Technology

[0002] In 2021, the Yangtze River Navigation Administration of the Ministry of Transport issued the "Promotion Plan for the Upgrading of Shore Power System Receiving Facilities for Ships in the Yangtze River Economic Belt." The plan stipulates that after the installation or upgrading of shore power system receiving facilities on ships, the commissioning of these facilities must be verified. The traditional solution is to use a test power supply to power the ship for commissioning, systematically checking for potential safety hazards. However, this method has significant limitations in responding to faults; it not only fails to detect potential faults but may also cause the fault to spread. For example, during testing with the test power supply, there have been instances where the switch failed to disconnect; if a fault exists at the downstream end, the consequences would be disastrous. Therefore, this application provides a shore power commissioning box specifically designed for commissioning ship power receiving systems. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a shore power commissioning box to meet the basic shore power commissioning function requirements under special commissioning scenarios for inland waterway vessel navigation. This invention conveniently and quickly achieves the above functions and solves the problem of the influence of distributed capacitance of long-distance cables on undervoltage control.

[0004] This utility model provides a shore power commissioning box, including a box body;

[0005] The enclosure is equipped with a first standard socket and a second standard socket on both sides for connecting to different types of vessels, serving as a commissioning tool for accessing the ship's shore power system; the first standard socket is a 125A marine socket; the second standard socket is a 63A marine socket.

[0006] The enclosure contains a circuit breaker, primary input terminals, an electric operating mechanism, a dissipation resistor, and a sampling control unit. The circuit breaker, primary input terminals, electric operating mechanism, dissipation resistor, and sampling control unit are connected and combined to form a control circuit that can control and switch sockets.

[0007] The front of the enclosure is hinged with a sealed door; the power indicator light, output power indicator light, and emergency stop button are all integrated into the sealed door of the enclosure.

[0008] The circuit breaker's operating handle passes through an opening on the front door of the enclosure, facilitating operation of the circuit breaker from outside the enclosure; a three-phase power inlet hole is located at the bottom of the enclosure for connecting to an external three-phase power supply.

[0009] Preferably, the case is equipped with a portable handle.

[0010] Preferably, a wire binding support for fixing the power supply wire is arranged along one side of the three-phase power supply inlet hole.

[0011] Preferably, a separate grounding column is arranged at the bottom of the box.

[0012] Preferably, the external three-phase power supply ABC and PE are connected to the primary input terminal DZ1 inlet through a primary cable.

[0013] The primary input terminal DZ1 outlet is connected to the breaker 1QF upper port L1, L2, L3 through a cable, and PE is connected to the PE connection point of the 125A and 63A standard marine sockets and a separate grounding column arranged at the bottom of the box through a cable.

[0014] The breaker 1QF three-phase lower port L11, L12, L13 is connected to the three-phase interface of the 125A and 63A standard marine sockets through wires.

[0015] The breaker 1QF lower port L11, L13 leads out A610, C610 lines, and the output indicator lamp Hr is connected in parallel across the A610, C610 lines.

[0016] The breaker 1QF upper port L1, L3 is connected in series with the fuses FU1, FU2, respectively, and leads out A600, C600 lines; the power supply indicator lamp Hw is connected in parallel across the A600, C600 lines.

[0017] The A600, C600 lines are connected in parallel across another line; the A600, 101 are connected to the emergency stop button SB; the 101, 103 are connected to the 125A relay switch 1DK, and lead out the control signal connection points P2, P1 connected to the 125A standard marine socket; the 103, 105 are connected to the 63A relay switch 2DK, and lead out the control signal connection points P2, P1 connected to the 63A standard marine socket; the 105 line passes through the under-voltage release coil 1QF and is connected to the C600 line, and the lower end of the coil leads out a wire connected to the power resistor connected to the control relay switch group 3DK, which is selected by the sampling control unit according to the measurement of the cable distribution capacitor to output the control relay group 3DK to access different numbers of dissipative resistors R1, R2, R3, R4 to the upper end of the under-voltage release coil 1QF, to complete the loop, and to control the heating power and reliable under-voltage release by controlling the number of dissipative resistors connected to the circuit.

[0018] Preferably, the 63A or 125A shore power system is selected for joint debugging test by adjusting the opening and closing of the bypass switches 1DK, 2DK.

[0019] Compared with the prior art, the utility model has the beneficial technical effects that:

[0020] The utility model discloses on the circuit structure has creatively added the dissipation resistance to weaken the adverse effect of distribution capacitance. The utility model discloses based on the existing ship shore power debugging demand, opens a brand -new debugging tool, makes up the test tool blank of ship shore power system power receiving facility, under the premise that guarantees the ship shore power system power receiving facility debugging demand, has achieved the simplification debugging task, the standardization debugging work, maintains the personal safety. In addition, through the use mathematical mechanism analysis key research has failed phenomenon of the actual application of the loss of voltage tripping, obtained the influence relation of the voltage of the loss of voltage coil by the distribution capacitance of the cable, thereby further improves the design structure, and gives the solution scheme, guarantees the reliable loss of voltage tripping of shore power joint debugging box under the actual application process of emergency stop. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the existing shore power reconstruction system topology reference diagram;

[0022] Figure 2 It is the device assembly drawing in the utility model embodiment;

[0023] Figure 3 It is the device electrical schematic diagram in the utility model embodiment;

[0024] Figure 4 It is the device plane layout drawing in the utility model embodiment;

[0025] Figure 5 It is the loss of voltage control equivalent circuit diagram in the utility model embodiment;

[0026] Figure 6 It is the shutdown voltage coefficient K in the utility model embodiment MX Characteristic analysis diagram;

[0027] Figure 7 It is the loss of voltage control circuit diagram in the utility model embodiment;

[0028] Figure 8 It is the loss of voltage coil voltage characteristic simulation diagram in the utility model embodiment.

[0029] Fig. 1, circuit breaker;2, primary input terminal;3, power indicator lamp;4, output live indicator lamp;5, emergency stop button;6, electric operating mechanism;7, sampling control unit;8, dissipation resistance;9, first standard socket;10, second standard socket;11, portable handle;101, opening;12, three-phase power supply wire hole;13, wire binding support;14, grounding column. DETAILED DESCRIPTION

[0030] Embodiment one

[0031] As Figure 1As shown, the shore power transformation system topology reference diagram details the structure of the shore power system, including the shore power supply pile, which provides 63A and 125A standard sockets; the ship cable winch on the ship, which connects the shore power supply pile and the shore power box on the ship; the shore power joint debugging box described in the application plays the role of replacing the shore power supply pile in the red box during debugging; the shore power joint debugging box structure assembly diagram is as shown in Figure 2 As shown, the box body includes a box body;

[0032] The first standard socket 9 and the second standard socket 10 are arranged on the two sides of the box body, respectively, for connecting with different types of ships, which are connected to the ship shore power system as joint debugging tools; wherein the first standard socket 9 is a 125A marine socket; and the second standard socket 10 is a 63A marine socket;

[0033] A portable handle 11 is arranged on the top of the box body, and the box body can be moved to a designated position through the portable handle 11;

[0034] The box body is internally provided with a circuit breaker 1, a primary input terminal 2, an electric operating mechanism 6 (i.e. an electric operating mechanism), a dissipation resistor 8, and a sampling control unit 7; the control circuit of the controllable and switchable socket is formed by connecting and combining the circuit breaker 1, the primary input terminal 2, the electric operating mechanism 6, the dissipation resistor 8, and the sampling control unit 7;

[0035] A sealing door is hingedly connected to the front end of the box body; a power indicator 3, an output live indicator 4, and an emergency stop button 5 are integrated on the sealing door of the box body; the circuit breaker 1, the primary input terminal 2, the power indicator 3, the output live indicator 4, the emergency stop button 5, the electric operating mechanism 6, the sampling control unit 7, and the dissipation resistor 8 are electrically connected.

[0036] The operating handle of the circuit breaker 1 passes through the opening 101 on the front door of the box body, facilitating the opening and closing of the circuit breaker 1 outside the box; a three-phase power inlet hole 12 is opened on the bottom of the box body for connecting an external three-phase power supply. A separate grounding column 14 is arranged on the bottom of the box body. Specifically, in order to ensure the operation safety of the joint debugging box, an external protective ground PE is connected to the primary input terminal 2 during debugging, and the protective ground PE is connected to the box body shell and the front door. In addition, the protective ground PE is also connected to the 125A marine standard socket 9 and the 63A marine standard socket 10.

[0037] In this embodiment, a wire fixing bracket 13 for fixing the power line is arranged along one side of the three-phase power inlet hole 12, which assists in fixing the power line and prevents displacement during use.

[0038] In this embodiment, as shown in Figure 3The external three-phase power supply ABC and PE are connected to the primary input terminal DZ1 through a primary cable; the primary input terminal DZ1 is connected to the lower port L1, L2 and L3 of the circuit breaker 1QF through a cable; PE is connected to the PE connection point of the 125A and 63A standard marine socket and the grounding column arranged at the bottom of the box through a cable; the lower port L11, L12 and L13 of the circuit breaker 1QF are connected to the three-phase interface of the 125A and 63A standard marine socket through wires; the A610 and C610 wires are led out from the lower port L11 and L13 of the circuit breaker 1QF, and the output indicator lamp Hr is connected in parallel to the A610 and C610 wires; the A600 and C600 wires are led out from the upper port L1 and L3 of the circuit breaker 1QF in series with the fuses FU1 and FU2, respectively; and the power indicator lamp Hw is connected in parallel to the A600 and C600 wires.

[0039] The A600 and C600 wires are connected in parallel to another wire; the emergency stop button SB is connected between the A600 and 101; the 125A relay switch 1DK is connected between the 101 and 103, and the control signal connection points P2 and P1 connected to the 125A standard marine socket are led out; the 63A relay switch 2DK is connected between the 103 and 105, and the control signal connection points P2 and P1 connected to the 63A standard marine socket are led out; the wire 105 is connected to the C600 wire through the under-voltage release coil 1QF, and the wire led out from the lower end of the coil is connected to the power resistor connected to the control relay switch group 3DK; according to the measurement of the cable distribution capacitor, the sampling control unit 7 selects the control relay group 3DK to be connected to different numbers of dissipative resistors R1, R2, R3 and R4 (of the same specification 50kΩ, 10W) connected to the upper end of the under-voltage release coil 1QF, to complete the circuit, so as to control the heating power and reliable under-voltage release by controlling the number of dissipative resistors connected to the circuit.

[0040] In the Figure 2 , the 125A and 63A standard marine sockets are arranged on the joint box, and are connected to the corresponding standard sockets of the 125A and 63A shore power boxes arranged below in the Figure 3 . Taking the 125A marine shore power system equipment debugging as an example, after the connection cable is completed, it can be seen that the positions of the control signal connection points P2 and P1 led out from the 101 and 103 to the standard marine socket are conducted to the P2 and P1 of the ship shore power box socket through the 100-meter-long cable, and the P2 and P1 are in series with the emergency stop button SB1 of the shore power box in the ship shore power box; the 63A debugging connection is similar to the above.

[0041] The emergency stop button SB corresponds to the technical solution Figure 2The emergency stop button 5 of the joint debugging box corresponds to the emergency stop button of the 125A shore power box, SB1 corresponds to the emergency stop button of the 63A shore power box, SB2 corresponds to the emergency stop button of the 63A shore power box, and the test scheme of the corresponding standard interface suitable for the 63A and 125A shore power systems of different specifications is selected. During debugging, the joint debugging box can provide safe access to the test power supply for the power receiving facilities to be tested, and can realize the cutting function of the debugging box and the shore power box.

[0042] In the debugging function, the joint debugging box can realize 63A loop debugging and 125A loop debugging functions respectively.

[0043] The sampling control unit 7 detects the limit detection switch equipped in the 125A marine standard socket 1 and the standard socket 2; when the 125A socket is detected to be connected, the relay switch 2DK is automatically closed and the relay switch 1DK is opened, at this time, whether the joint debugging box emergency stop button or the shore power box emergency stop button can realize the cutting task of the test circuit (simulate the accidental emergency power-off in actual use); similarly, when the 63A socket is detected to be connected, the relay switch 2DK is automatically opened and the relay switch 1DK is closed, and the specific debugging method is: in the 63A loop debugging, the relay switch 1DK is closed and the relay switch 2DK is opened, and in the circuit state at this time, Figure 3 The joint debugging box emergency stop button SB and the 63A shore power box emergency stop button SB2 are connected in series between A600 and C600. At this time, whether the joint debugging box emergency stop button SB or the shore power box emergency stop button SB2 can realize the cutting task of the test circuit (simulate the accidental emergency power-off in actual use). In the 125A loop debugging, the relay switch 1DK is opened and the relay switch 2DK is closed, and the joint debugging box emergency stop button SB and the 125A shore power box emergency stop button SB1 are connected in series between A600 and C600. In terms of debugging flexibility, the joint debugging box can flexibly access dissipation resistors R1, R2, R3 and R4 of different capacities according to the characteristics of the cable material and length, and can maximize the reduction of the equivalent capacitance effect of the cable to realize reliable opening of the line.

[0044] The joint debugging box is shown in the plane three view as Figure 4 When testing power receiving facilities of different specifications, the opening and closing of the bypass air switch 1DK and 2DK are adjusted to flexibly select 63A or 125A shore power system joint debugging test. The joint debugging box is designed with a portable handle to facilitate testing with the ship at any time and anywhere.

[0045] Taking the 125A shore power system joint debugging test as an example, the use and operation process is described in detail:

[0046] Preparation stage: open circuit impedance measurement of the cable end; the cable end short circuit measurement of short circuit impedance. After completion of the sampling control unit 7 will operate cable distribution capacitor, according to the distribution capacitor capacity step selection output control relay switch group 3DK access dissipative resistance;

[0047] Debugging stage: 1, confirm that the circuit breaker switch is in the open position, the input end is not powered on; correct wiring;

[0048] 2, after determining that the wiring is reliable, the input end is powered on, if everything is normal, the power indicator light of the joint debugging box panel should be lit, the circuit breaker 1 is closed, if everything is normal, the output indicator light should be lit;

[0049] 3, the input end is connected to the main power A-B-C three-phase and protection ground PE from the joint debugging box bottom hole, for example, the output end is connected to the 125A standard socket, and the relay switch 2DK in the joint debugging box is closed;

[0050] 4, press the joint debugging box emergency stop SB to test the emergency stop function of the joint debugging box; after the emergency stop function is normal, power on again, press the test shore power box emergency stop SB1 to ensure that the emergency stop function is normal;

[0051] 5, after the shore power box emergency stop function is normal, power on again, and test the power on operation of the ship power receiving facility;

[0052] 6, after the power on operation test of the power receiving facility is completed, power off and arrange the wire harness.

[0053] Fault handling: 1, the background system detects the fault after the debugging stage and immediately issues an instruction to the sampling control unit 7 to control the electric operating mechanism 6 to cut off the circuit breaker 1; the existing online monitoring system that can match it is selected as the background system; it should be noted that the applicant also applies for a patent for the monitoring and diagnosis method of the joint debugging box during the debugging process, which will not be described in detail here.

[0054] 2, when abnormal power failure occurs, stop testing immediately, extract the debugging fault log, find and eliminate the fault source; after the fault is eliminated, start debugging.

[0055] It is worth noting that the joint debugging box will generate a certain amount of heat power during use, and the device does not have an active cooling device, so it should be avoided to use continuously for a long time. After the debugging work is completed without error, the device connection should be disconnected in time.

[0056] Example two

[0057] The utility model provides a kind of test method of shore power joint debugging box, applied to joint debugging box in example one, comprising the following specific steps:

[0058] S1, impedance analysis is carried out on the circuit, and an equivalent circuit is constructed;

[0059] S2, perform distributed capacitance analysis based on the constructed equivalent circuit;

[0060] S3, perform characteristic analysis on the equivalent circuit based on the MATLAB tool;

[0061] S4, adjust each parameter in the equivalent circuit based on the analysis result;

[0062] S5, perform simulation using the adjusted equivalent circuit and verify the accuracy of the simulation result through experiment.

[0063] Explanation of the influence of distributed capacitance on the system emergency stop function:

[0064] In the integration box manufacturing and function test stage, the original design does not have a Figure 3 dissipation resistor in parallel with the under-voltage release 1QF at both ends R , which is reflected as a dissipation resistor R in the electrical principle Figure 3 is infinite. However, in actual debugging operation, although the emergency stop button is pressed, there is a probability that the under-voltage release will fail to trip, resulting in failure of the emergency stop during debugging. In view of this abnormal working condition, after re-examining the circuit characteristics and working principle, it is determined that the reason for the failure of the under-voltage release 1QF to trip is that there is a certain distributed capacitance in the long-distance power cable, which causes the voltage on the under-voltage release coil to still not reach the release limit value even if the emergency stop is pressed.

[0065] In view of the above analysis, by connecting a certain dissipation resistor in parallel with the under-voltage release coil, the voltage amplitude on the under-voltage release in the line is reduced. In order to fully understand the mechanism of the distributed capacitance of the long-distance connection cable, the control loop is analyzed here.

[0066] When the cable is long, although the emergency stop is disconnected, the long-distance control cable is equivalent to a capacitor connected in series in the loop, and the under-voltage release coil can be equivalent to a resistor and an inductor. The total equivalent circuit structure is as shown in the following Figure 5 .

[0067] The equivalent circuit includes power lines L1, L3, resistors R, R MX , inductors L MX , and a capacitor C;

[0068] Among them, the resistors R MX , inductors L MX form a series R-L circuit, and then a capacitor C is connected in series and connected to the power line L1; one end of the resistor R MX is connected to the power line L3;

[0069] The resistor R is connected in series with the resistor R MX , the inductor L MXThe R-L circuit is parallelly connected;

[0070] In this circuit, the power supply is AC with a certain frequency f, and the equivalent impedance of inductance and capacitance is affected by the frequency of the power supply. Therefore, the equivalent impedance of inductance and capacitance needs to be taken into account in the analysis.

[0071] The equivalent impedance of the capacitor and the voltage loss coil: Z MX =(R MX +jωL MX ) / / R, where ω=2πf.

[0072] The voltage on the voltage loss coil: U MX =K MX (U L1 -U L3 ), where the coefficients U L1 , U L3 and U MX are the voltages on L1, L3, respectively.

[0073] Analysis shows that when the power supply frequency f is constant, the voltage U MX on the voltage loss coil is positively correlated with the coefficient K MX , which can be used to determine the voltage on the voltage loss coil.

[0074] The distributed capacitance of the cable refers to the capacitive effect between the internal conductors of the cable and the conductors and the ground. This capacitive effect is determined by the geometric structure of the cable and the dielectric constant of the insulating material. In long-distance power cables, the distributed capacitance cannot be ignored, and its existence will affect the cable current and reactive power. The formula for calculating the distributed capacitance of the cable is: where ε0 is the vacuum permittivity (about 8.854×10 -12 F / m), ε r is the relative dielectric constant of the insulating material, and D is the inner diameter of the outer conductor and d is the outer diameter of the inner conductor. Therefore, the equivalent capacitance of the cable is affected by several factors. In the following simulation analysis, the range of the distributed capacitance of the cable per unit length is selected to be 10 pF / m to 1000 pF / m for analysis.

[0075] Characteristic analysis: using MATLAB tools, the mathematical relationship between the coefficient K MX of the voltage U MX of the voltage loss coil and the power supply frequency f, the cable distributed capacitance C, and the parallel dissipation resistance R is comprehensively and quantitatively analyzed. In mathematical calculations, the DC resistance R MX of the voltage loss coil is taken as 100 kΩ, L MX = 50 H, and the cable length is designed to be 100 m. The voltage UMX coefficient K MX The relationship between power supply frequency f, cable distributed capacitance C, and parallel dissipation resistance R.

[0076] like Figure 6 As shown, given a fixed cable distributed capacitance, when the power supply frequency f ≥ 40Hz, as the value of the parallel dissipation resistor R on the vertical axis increases (corresponding to a decrease in dissipation power), the turn-off voltage U... MX coefficient K MX It shows an increasing trend, which corresponds to the voltage U on the undervoltage coil. MX Excessive voltage may cause disconnection failure. Adding a suitable dissipation resistor can reduce the turn-off voltage U to some extent. MX coefficient K MX .

[0077] When the distributed capacitance C is 0.001uF, the dissipation resistance R changes within the range of 10kΩ-20kΩ, and the coefficient K... MX It will never be higher than 0.03, which means that the capacitance of the distributed capacitance C is too small at this time, and the abnormal phenomenon of the undervoltage tripping 1QF not being able to disconnect will not occur.

[0078] However, when the distributed capacitance C reaches 0.1uF and the power supply frequency f = 50Hz, from Figure 6 The coefficient K can be seen in the text. MX The distribution range expands to nearly 1, at which point the impact of the distributed capacitance on the undervoltage trip 1QF intensifies. Figure 6 As can be seen above, only by selecting a dissipation resistor with a resistance value of less than 5kΩ can the coefficient K be effectively reduced. MX Reduced to below 0.5.

[0079] Based on the above analysis, the selection of the dissipation resistor R needs to fully consider the capacitance C of the cable. For larger distributed capacitances, the power dissipation needs to be increased and the resistance value of the dissipation resistor decreased accordingly. Considering the common range of distributed capacitance per unit length for cables (10pF / m to 1000pF / m), the conclusion is that the resistance value of the power resistor should be controlled within the range of 6 to 10kΩ to eliminate the adverse effects of the cable's distributed capacitance on undervoltage tripping.

[0080] It is worth noting that since the dissipation resistor is constantly connected to the line during operation, it inevitably consumes a certain amount of electrical power. Furthermore, the conclusion drawn above, which limits the power resistor value to 6-10kΩ, while applicable to common cable distributed capacitance ranges, still results in a significant power consumption P=U. 2R, the power range can be calculated: 16W-26.7W, such power consumption is obviously not allowed. On the one hand, the high power consumption means that the heat dissipation requirement of the device increases; on the other hand, the reliability of the dissipation resistance is higher.

[0081] Further analysis found that the unit length distribution of the cable capacitor is mostly concentrated in 100pF / m-300pF / m, and the corresponding 100m length under the capacitance range is 0.01uF-0.03uF. The above 6kΩ-10kΩ dissipation resistance range is taken to cope with the extreme case, but the above dissipation resistance heating power range is 16W-26.7W, which is obviously unreasonable in heating power. Therefore, the equivalent resistance value of the dissipation resistance shown in the following table is accessed as a reference.

[0082]

[0083] Based on the above analysis, the design is further improved, and the distribution capacitor detection function is integrated in the sampling control unit 7. The three-voltage method is used to complete the capacitance detection of the cable distribution capacitor. In the test, the open circuit impedance Z OC and short circuit impedance Z SC of the cable are measured respectively, and the characteristic impedance of the cable is obtained by applying the formula Further calculation of propagation constant γ:

[0084] Where l is the cable length, α is the attenuation constant, and β=2πf / v(v is the propagation speed) is the phase constant. It is worth pointing out that in practical applications, in the case of low loss, the approximate method (α≈0) is usually used to simplify the calculation, and then the equation set is simplified to approximate solution;

[0085] The characteristic impedance Z0, the propagation constant γ, and the unit length inductance L and the capacitance C have the following relationship: According to the above formula, the capacitance C can be calculated:

[0086] C≈β / ωZ0=1 / Z0v;

[0087] Before debugging, the sampling control unit can complete the distribution capacitor detection of the cable by the three-voltage method before the system test, and according to the measured cable distribution capacitor value, the output control relay 3DK step selection access power resistor (R1, R2, R3, R4) is selected according to the above table, in order to eliminate the adverse effects of the distribution capacitor.

[0088] On the basis of the above, the LTspice tool is used for experimental verification, and the like Figure 7The voltage simulation circuit is shown, wherein the capacitor is selected as 0.005uF. The first path (R1, L1, C1) without the parallel dissipative resistor; the second path (R2, R21, L2, C2) with the parallel 50kΩ dissipative resistor; and the third path (R3, R31, R32, L3, C3) with the parallel two 50kΩ dissipative resistors. The voltage of the coil can be calculated by measuring the voltage of nodes v1, v2, v3, v4 as Figure 8 .

[0089] In the first path without the parallel resistor, the voltage on the loss voltage coil is obviously higher than that of the second path and the third path with the parallel dissipative resistor. In comparison, the parallel resistor with a 50kΩ dissipative resistor has a more obvious effect on reducing the voltage on the loss voltage coil, and the parallel 50kΩ has a stronger effect, which can reduce the voltage on the loss voltage coil to the effective range of the protection value, which is consistent with the above analysis.

[0090] The above joint debugging box is based on the existing ship shore power debugging demand, and opens a new debugging tool, which makes up for the test tool blank of the ship shore power system power receiving facility. Under the premise of ensuring the debugging demand of the ship shore power system power receiving facility, the debugging task is simplified, the debugging work is standardized, and the personal safety is maintained. In addition, the failure phenomenon of the loss voltage coil in practical application is analyzed by using mathematical mechanism, and the relationship between the voltage on the loss voltage coil and the distributed capacitance of the cable is obtained, so as to further improve the design structure and give the solution, and ensure the reliable loss voltage trip of the shore power joint debugging box in the process of practical application.

[0091] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A shore power joint commissioning box, characterized in that, The box includes a box body; The box body is provided with a first standard socket and a second standard socket on both sides, which are used for connecting with different types of ships and accessing the shore power system of the ship as a commissioning tool; wherein the first standard socket is a 125A marine socket; and the second standard socket is a 63A marine socket; The box body is internally provided with a circuit breaker, a primary input terminal, an electric operating mechanism, a dissipation resistor and a sampling control unit; the circuit breaker, the primary input terminal, the electric operating mechanism, the dissipation resistor and the sampling control unit are connected and combined to form a control circuit capable of controlling and switching the socket; The box body is hingedly provided with a sealed door at the front end; a power indicator, an output live indicator and an emergency stop button are integrated on the sealed door of the box body; The operating handle of the circuit breaker penetrates through the opening on the front door of the box body, so as to facilitate the opening and closing of the circuit breaker outside the box; the bottom of the box body is provided with a three-phase power supply inlet hole for connecting the external three-phase power supply.

2. The shore power commissioning box of claim 1, wherein, A portable handle is arranged on the box body.

3. The shore power commissioning box of claim 1, wherein, A wire fixing support is arranged on one side of the three-phase power supply inlet hole for fixing the power supply wire.

4. The shore power commissioning box of claim 1, wherein, A separate grounding column is arranged at the bottom of the box body.

5. The shore power commissioning box of claim 1, wherein, The external three-phase power supply ABC and PE are connected to the primary input terminal DZ1 inlet through a primary cable; The primary input terminal DZ1 outlet is connected to the upper ports L1, L2 and L3 of the circuit breaker 1QF through a cable, and PE is connected to the PE connection points of the 125A and 63A standard marine sockets and the separate grounding column arranged at the bottom of the box body through a cable; The three-phase lower outlets L11, L12 and L13 of the circuit breaker 1QF are connected to the three-phase interfaces of the 125A and 63A standard marine sockets through wires; The lower outlets L11 and L13 of the circuit breaker 1QF lead out A610 and C610 lines, and the output indicator Hr is connected across the A610 and C610 lines; The upper inlet L1 and L3 of the circuit breaker 1QF are connected in series with fuses FU1 and FU2, and lead out A600 and C600 lines; the power indicator Hw is connected in parallel across the A600 and C600 lines; A600 and C600 lines are connected in parallel across another line; the A600 and 101 are connected to the emergency stop button SB; 101 and 103 are connected to the 125A relay switch 1DK, and lead out the control signal connection points P2 and P1 connected to the 125A standard marine socket; 103 and 105 are connected to the 63A relay switch 2DK, and lead out the control signal connection points P2 and P1 connected to the 63A standard marine socket; 105 line passes through the under-voltage release coil 1QF and is connected to the power resistor connected to the control relay switch group 3DK; the sampling control unit selects the output control relay group 3DK to connect to different numbers of dissipation resistors R1, R2, R3 and R4 to the upper end of the under-voltage release coil 1QF according to the measurement of the cable distribution capacitor, to complete the circuit, and to control the heating power and reliable under-voltage release by controlling the number of dissipation resistors connected to the circuit.

6. The shore power commissioning box of claim 4, wherein, The opening and closing of the bypass switches 1DK and 2DK are adjusted to select the 63A or 125A shore power system for commissioning test.

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