CN215990317U

CN215990317U - Multifunctional low-voltage large-capacity shore power connection box circuit for port

Info

Publication number: CN215990317U
Application number: CN202023295623.6U
Authority: CN
Inventors: 常冀凡; 张志鹏; 丁笑寒; 周洋
Original assignee: Jiangsu Zhongzhi Marine Engineering Equipment Co ltd
Current assignee: Jiangsu Xihua Electric Appliance Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-03-08
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a multifunctional low-voltage large-capacity shore power connection box circuit for a port, which comprises a three-phase lightning protection and surge protection device SPD, a main circuit breaker Q of a power connection box, a three-phase multifunctional monitor MPS, a fuse 1FU, a fuse 2FU, a fuse 3FU, a fuse 1F, a fuse 2F, a fuse 3F, a fuse 4F, a fuse 5F, a current transformer T, a power indicator lamp H and a multifunctional instrument P.

Description

Multifunctional low-voltage large-capacity shore power connection box circuit for port

Technical Field

The utility model relates to a multifunctional low-voltage large-capacity shore power connection box circuit for a port, and belongs to the technical field of ship electrical equipment.

Background

Regulations for limiting the release of atmospheric pollutants from ships during port-entry are becoming more and more stringent throughout the world, and many countries release documents that regulate the need to stop the operation of generators on ships during port-entry, and the use of shore power by port-entry ships has become a necessary trend in the shipping industry.

China is a contracting country of Paris climate agreement, in recent years, relevant departments of China successively release a series of policies, specifications and standards about the shore power for connection of ships in harbors, and only the transportation department releases more than ten documents, so that the environmental protection is emphasized, and the shore power is greatly promoted to be used during the harboring of the ships.

In 12 months in 2019, the transportation department issues a port and ship shore power management method in the No. 45 directive, and the requirements are that a wharf project unit synchronously designs and constructs shore power facilities for newly building, reconstructing and extending wharf projects (except oil and gas chemical wharfs) according to requirements such as laws, regulations and mandatory standards; and the Chinese ships berthing in the ship atmospheric pollution emission control area need to meet the atmospheric pollution emission requirement and additionally install the ship power receiving facilities, and corresponding waterway transportation operators should make installation plans of the ship power receiving facilities and organize and implement the plans.

On the world climate stamina meeting in 2020, China provides a great target for reducing 65% of carbon emission compared with 2005. The shore power is used during the harboring period of the ship, compared with the fuel oil power generation used by the ship, the emission of pollutants such as sulfide, nitrogen oxide and particulate matters during the harboring period of the ship can be greatly reduced, and the method is an important way for building green harbor navigation and realizing energy conservation and emission reduction. Therefore, popularization of shore power for harbor ships is an important measure for achieving the ambitious goal of emission reduction.

International Electrotechnical Commission (IEC) in 2016 for IEC/IEEE 80005-3: 2014 public harbour connection facility part 3: low voltage shore power connection (LVSC) system-general requirements [ Utility connections in port-Part 3: low Voltage Shore Connection (LVSC) Systems-General requirements ] were revised. Subsequently, international and domestic related departments also revise and make a batch of standards/specifications related to the low-voltage shore power system, and the national grid company issues Q/GDW 11468.2-2016 part 2 of technical specification of port shore power equipment for the construction of the regulated port shore power facilities: low-voltage bulk Power supply, Q/GDW 11468.3-2016 Port Shore Equipment Specification part 3: low-voltage small-capacity power supply, Q/GDW 11468.4-2016 Port Shore Equipment Specification part 4: ship shore connection and interface equipment "; the transportation department designs technical standards for standardizing a shore power facility system, improves the construction quality of the shore power facilities of the wharf in China, and issues JTS155 plus 2019 technical specifications for the construction of the shore power facilities of the wharf and JTS155.1-2019 technical specifications for the detection of the shore power facilities of the wharf; the inspection guide 2018 issued by the Chinese classification society of ships (CCS) for on-shore power supply facilities of ships and docks puts forward relevant requirements on the aspects of safety technology of on-shore power facilities of ports and docks and the like.

To meet the technical and safety regulations of IEC/IEEE80005-3, IEC60309-5:2017 issue matching standard "plug and socket for industry-coupler-part 5: dimensional compatibility and interchangeability requirements for sockets, plug-and-connectors and ports for marine low voltage shore power (LVSC) systems for marine vessels [ Plugs, socket-and couplers for industrial purposes-Part 5: Dimensional compatibility and interconnection requirements for Plugs, socket-outlets, and coupler for low-voltage shore connection systems (LVSC) ], which is described in the introduction: "60309" is a single type of plug, receptacle-to-ship connector and ship inlet (hereinafter referred to simply as an accessory) specifically adapted to connect a ship to an onshore low voltage shore power supply system as described in the IEC/IEEE80005-3 standard. "[ This part of60309 applications to a single type of plug, socket-out, ship connector and ship inlet, hereinafter referred to as accesses, interrupted to connected to shared system described in IEC/IEEE80005-3 ], and states that This part of" 1EC60309 applies to three phase accessories with a ground contact and four control contacts "[ This part of 1EC60309 applications to third-phase access with an earth contact and with four control contacts ]. IEC60309-5:2017, chapter 5, "Standard rating" specifies that The accessories of shore power systems "maximum AC operating voltage is 690 volts 50/60 Hz" [ The maximum AC operating voltage is 690V 50/60Hz ], "maximum rated current is 350A" [ The maximum rated current is 350A ], and that "plugs, sockets, marine connectors and marine inlets should be rated for a minimum expected short-circuit current of 16kA (effective value) 1s and a maximum rated peak withstand current of40 kA" [ The plug, socket-output, ship input and ship connector with a minimum expected short-circuit current of 16kA Robust (RMS) for 1s and a maximum rated current of 40.

IEC60309-5: the 2017 standard gives a standard structure diagram of a socket/plug with a standard rating of 690V and 350A and a standard structure diagram of a marine connector/marine input port, and a main contact and a control contact of the connector/marine input port are L1+ L2+ L3+ E + P1+ P2+ P3+ P4, which are consistent with the contact arrangement of an IEC/IEEE80005-3 standard shore-to-shore electrical connection accessory, please refer to the attached figures 1 and 2 in the specification. The newly released ship construction standard modification notice of the CCS definitely requires that the plug connector of the input port of the ship-borne low-voltage shore power box conforms to the recognized IEC60309-5:2017 standard or other equivalent standards.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multifunctional low-voltage large-capacity shore power connection box circuit for a port, wherein a shore power interface of the connection box meets the international standard and ensures compatibility, the connection box has the functions of lightning protection and surge overvoltage protection, a connector clip can be prevented from being plugged in and pulled out in a hot-line manner, the connection box meets the protection requirement of the international standard requirement, the connection box is provided with a shore power indication and metering instrument, and the principle of the connection box circuit meets the design requirement of the fault safety principle.

The purpose of the utility model is realized by the following technical scheme:

a multifunctional low-voltage large-capacity shore power connection box circuit for a port comprises a three-phase lightning protection and surge protector SPD, a main circuit breaker Q of a connection box, a three-phase multifunctional monitor MPS, a fuse 1FU, a fuse 2FU, a fuse 3FU, a fuse 1F, a fuse 2F, a fuse 3F, a fuse 4F, a fuse 5F, a current transformer T, a power indicator lamp H and a multifunctional instrument P, wherein the main circuit breaker Q is provided with an electronic release PR222DS/PD, one end of the three-phase lightning protection and surge protector SPD is grounded, the other end of the three-phase lightning protection and surge protector SPD is respectively connected with an A phase, a B phase and a C phase of a shore power supply through the fuse 1FU, the fuse 2FU and the fuse 3FU, an L1 end, an L2 end and an L3 end of the three-phase multifunctional monitor SPD are respectively connected with the A phase, the B phase and the C phase of the shore power supply through the fuse 1F, the fuse 2F and the fuse 3F, the L1 end, the L2 end and the L3 end of the multifunctional instrument P are respectively connected with the L1 end, the L2 end and the L3 end of a three-phase multifunctional monitor MPS, the N end of the multifunctional instrument P is connected with the N phase of a port shore power supply, the In end of the multifunctional instrument P is grounded, a power indicator lamp H is connected between the L1 end and the L2 end of the three-phase multifunctional monitor MPS, four poles of a main contact inlet end of a main circuit breaker Q of a connecting box are respectively connected with the N phase, the A phase, the B phase and the C phase of the port shore power supply, four poles of a main contact outlet end of the main circuit breaker Q of the connecting box are respectively connected with the N end, the L1 end, the L2 end and the L3 end of a connecting box socket XS, a current transformer T arranged on a main circuit of the electric power supply is In a star connection mode, one end of a secondary winding of the current transformer T is grounded, the other end is respectively connected with the Ia end, Ib end and Ib end of the multifunctional instrument P, the SY end of a SY end 3 end of a SY end of a fault signal indicating contact socket of the main circuit box main circuit breaker Q of the connecting box XS, Between the ends P4, one ends of a fuse 4F and a fuse 5F are connected with the positive pole and the negative pole of a DC24V power supply, the other end of the fuse 4F is connected with one end of a voltage-losing coil YU of a main circuit breaker Q of a junction box, the other end of the voltage-losing coil YU of the main circuit breaker Q of the junction box is connected with the end P1 of a junction box socket XS, and the other end of the fuse 5F is connected with a cut-off button 1S, the end 15-18 of an output relay R1 movable contact of a three-phase multifunctional monitor MPS and the end 25-28 of an output relay R2 movable contact of the three-phase multifunctional monitor MPS in series and then is connected with the end P2 of the junction box socket XS.

The object of the utility model can be further achieved by the following technical measures:

the multifunctional low-voltage large-capacity shore power connection box circuit for the port is characterized in that the model of a three-phase lightning protection and surge protection device SPD is 3 XOVR BT23N-8KA/20 uS; the model of the three-phase multifunctional monitor MPS is CM-MPS.43; the multifunctional meter P is model IM 301.

The multifunctional low-voltage large-capacity shore power connection box circuit for the port is characterized in that an electronic release PR222DS/PD arranged on a main circuit breaker Q is provided with a wireless communication unit BT030, the wireless communication unit BT030 is connected to a test connector on a front panel of the main circuit breaker Q, and operation data are downloaded and communication is carried out through a 5G mobile phone or a portable computer.

Compared with the prior art, the utility model has the beneficial effects that: the shore power interface of the power connection box conforms to the international standard, compatibility is ensured, the power connection box has the functions of lightning protection and surge overvoltage protection, the power connection box can prevent live plugging and unplugging of a connector clip, the power connection box meets the protection requirement required by the international standard, the power connection box is provided with a shore power indicator and a metering instrument, and the power connection box circuit principle meets the design requirement of a failure safety principle.

Drawings

FIG. 1 is IEC 60309-5; 2017, a standard rating socket/plug structure diagram;

FIG. 2 is IEC60309-5:2017, and providing a standard rated value marine connector/marine input port standard structure diagram;

FIG. 3 is a schematic diagram of a multifunctional low-voltage large-capacity shore power connection box circuit for a port;

FIG. 4 is a power supply diagram of a multifunctional low-voltage large-capacity shore power connection box of a port and a shipborne low-voltage single-loop shore power box;

fig. 5 is a schematic diagram of a shore power connection mode.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

As shown in figure 3, the multifunctional low-voltage large-capacity shore power connection box circuit for the port comprises a three-phase lightning protection and surge protector SPD, a main circuit breaker Q of a connection box, a three-phase multifunctional monitor MPS, a fuse 1FU, a fuse 2FU, a fuse 3FU, a fuse 1F, a fuse 2F, a fuse 3F, a fuse 4F, a fuse 5F, a current transformer T, a power indicator lamp H and a multifunctional instrument P, wherein the main circuit breaker Q is provided with an electronic release PR222DS/PD which is powered by a DC24V power supply, one end of the three-phase lightning protection and surge protector SPD is grounded, the other end of the three-phase lightning protection and surge protector SPD is respectively connected with an A phase, a B phase and a C phase of a shore power supply through the fuse 1FU, the fuse 2FU and the fuse 3FU, and an L1 end, an L2 end and an L3 end of the three-phase multifunctional monitor SPD are respectively connected with the A phase, the fuse 2F and the fuse 3F of the shore power supply through the fuse 1F, The intelligent multifunctional meter comprises a B phase and a C phase, wherein an L1 end, an L2 end and an L3 end of the multifunctional meter P are respectively connected with an L1 end, an L2 end and an L3 end of a three-phase multifunctional monitor MPS, an N end of the multifunctional meter P is connected with an N phase of a port shore power supply, an In end of the multifunctional meter P is grounded, a power indicator lamp H is connected between an L1 end and an L2 end of the three-phase multifunctional monitor MPS, a four pole connected with a main contact inlet end of a main circuit breaker Q of the box is respectively connected with the N phase, the A phase, the B phase and the C phase of the port shore power supply, a four pole connected with a main contact outlet end of the main circuit breaker Q of the box is respectively connected with an N end, an L1 end, an L2 end and an L3 end of a junction box socket XS, a current transformer T arranged on a main circuit of the shore power supply is In a star connection method, one end of a secondary winding of the current transformer T is grounded, the other end of the multifunctional meter P is respectively connected with an Ia end, an Ib end of a SY end and an end of a trip end 3 box connected with a fault signal indicating socket of the SY terminal of the main circuit breaker Q of the junction box XS, Between the ends P4, one ends of a fuse 4F and a fuse 5F are connected with the positive pole and the negative pole of a DC24V power supply, the other end of the fuse 4F is connected with one end of a voltage-losing coil YU of a main circuit breaker Q of a junction box, the other end of the voltage-losing coil YU of the main circuit breaker Q of the junction box is connected with the end P1 of a junction box socket XS, and the other end of the fuse 5F is connected with a cut-off button 1S, the end 15-18 of an output relay R1 movable contact of a three-phase multifunctional monitor MPS and the end 25-28 of an output relay R2 movable contact of the three-phase multifunctional monitor MPS in series and then is connected with the end P2 of the junction box socket XS.

The specifications of the electric components in the circuit of the junction box are shown in table 1.

TABLE 1 multifunctional low-voltage large-capacity shore power connection box electric component meter for port

The technical characteristics of the utility model are as follows:

the shore power interface of the power connection box is in an international standard, and compatibility is ensured.

The ship is classified into international sailing seacraft, domestic sailing seacraft and inland river ship according to legal inspection rules of ship and offshore facilities issued by the maritime administration of China and ship construction standards issued by CCS. The technical standards issued by IEC/IEEE80005-3 and IEC60309-5 on low-voltage shore power connection systems obviously aim at connecting low-voltage shore power of ports by international seagoing vessels, namely, low-voltage large-capacity power supplies in the port shore power equipment specified by national grid company Q/GDW 11468.2-2016 to supply power to ships. Except for ship types such as mail ships and refrigerated container ships, the demand of the marine ships for low-voltage shore power is in accordance with the relation between the Number of connections and the power demand and voltage in table 1 of IEC/IEEE80005-3 chapter 7 [ Number of connections as a function of power demand and voltage ], and the demand capacity is usually 250-1000 kVA, wherein the capacity of 250kVA (equivalent to 440V/328A or 690V/209A) is single-loop connection shore power. The socket and the plug of the port power connection box are shore power output ports, the marine connector/the marine input port of the shipborne shore power box are shore power input ports, and the compatibility between the marine connector and the marine input port is the premise that the convenience for connecting the shore power of a ship is guaranteed. Otherwise, shore power cannot be used during the pushing of the ship to port.

The shore power output port of the power connection box adopts 'standard rated values' AC690V, 50/60Hz and 350A specified by international standards, the contact is international standard L1+ L2+ L3+ E + P1+ P2+ P3+ P4, and the power connection box is suitable for supplying power to a shipborne low-voltage shore power box meeting IEC/IEEE80005-3 and IEC60309-5 standards. As the interfaces of the shore power receiving and power supply devices on the two sides of the ship and the shore are all international and unified accessories, the ship is of a single type, the capacity is consistent, and the compatibility and the use convenience are ensured.

The electrical box can meet expected short-circuit fault current.

IEC/IEEE80005-3 Standard 4.7 "Electrical requirements" [ Electrical requirements ] specifies: the "plug, socket, connector and inlet should be rated for at least 16kA RMS, 1s duration and 40kA peak [ Plugs, sockets-outputs, entries and connectors shall be rated for minimum of 16kA r.m.s.for 1s and 40kA peak. The standard rated value AC690V, 50/60Hz and 350A plugs and sockets are selected for the power connection box, the minimum expected short-circuit current rated value is not less than 16kA (root mean square value), the rated peak value withstanding current is not less than 40kA, and the requirement of IEC/IEEE80005-3 on the short-circuit current withstanding of accessories can be met.

The power connection box has the functions of lightning protection and surge overvoltage protection.

The power supply inlet end of the power connection box is provided with a three-phase lightning protection and surge protection device SPD which can discharge overvoltage formed by lightning and surge into the ground.

The power distribution box can prevent live plugging of the connector clip.

The control contacts P1 and P2 of the ship and the plug connectors on the two sides of the shore are connected in series in the undervoltage tripping loop of the power connection box, and the main breaker Q on the shore has a switching-on condition only after the plug connectors on the two sides of the ship shore are connected; after shore power is connected, in the process of pulling out the plug connector on any side, the main breaker Q on the shore side trips first, and the regulations of international and domestic relevant shore power standards/specifications on 'preventing the plug connector from being plugged in and out with electricity' can be met.

The fifthly electric box meets the protection requirements of the international standard.

The main circuit breaker Q of the connecting box is provided with an electronic release PR222DS/PD with a wireless communication unit BT030, has the functions of inverse time limit overload protection, time delay short-circuit fault protection, instantaneous short-circuit fault protection, ground fault protection and the like, completely meets the protection requirements of international and domestic standards on a low-voltage shore power connection system, has a wide protection threshold value adjusting range, and can meet different requirements; the wireless communication unit BT030 is connected to the test connector of the Q front panel, and can download all operation data and carry out communication through a 5G mobile phone or a portable computer.

Sixthly, reserving an interface for adding protection in the circuit of the power receiving box.

Other port protection and interlocking devices and an interface 2XT for emergency cut-off are reserved in the safety circuit of the power connection box. It can conveniently add other protection and control functions (for example, reverse power protection, high/low frequency protection, remote control emergency cut-off and the like should be added to the system for transferring load by briefly connecting shore power and a ship power station in parallel), and the break contact of the system can be conveniently connected in series to a control loop.

The auxiliary contacts AUX250V, AUX250V are provided on the main circuit breaker Q of the cabinet to provide the following electrical signals:

q — main breaker open/closed position auxiliary contacts (there are 3 pairs of C/O contacts): the system is respectively used for Q-switch-off/switch-on signal indication, trip alarm and interlocking of the main circuit breaker.

SY-release trip indicating auxiliary contacts (with 1 pair of C/O contacts): and the electrical signal indicating tripping caused by overload or short circuit, undervoltage tripping and the like is used for interlocking with the ship-side shore power box.

And the relay box is provided with a shore power indication and a metering instrument.

A power indicator lamp H and a multifunctional instrument P are arranged on the power inlet side of the power box and can indicate shore power to be electrified and display three-phase voltage, current, frequency, active power, reactive power and electric quantity.

The principle of the circuit of the self-supporting junction box meets the design requirements of the principle of fail-safe.

The circuit principle of the junction box is regulated according to IEC/IEEE80005-3 4.6 Design requirement [ Design requirements ]: "Protection and safety system should be designed according to the fail-safe principle" [ Protection and safety systems shell be designed based on the fail safe principle ], the three-phase multifunctional monitor MPS is a closed-circuit principle; the phase sequence monitoring function of the MPS is as per IEC/IEEE80005-3 chapter 5 "Low-Voltage Shore System requirements" [ LV shore supply systems ]: "phase sequence shall be L1-L2-L3 or 1-2-3or A-B-C or R-S-T, counterclockwise. Before the LVSC is electrified or connected in parallel, the phase sequence indicator must indicate the correct phase sequence "[ the phase sequence shape be L1-L2-L3 or 1-2-3or A-B-C or R-S-T, counter clock with the phase sequence indicator best index sequence from the main to the auxiliary LVSC ], so as to set the phase sequence protection of the junction box in positive sequence; when the three-phase voltage is normal and the phase sequence is correct, 2 output relays R1 and R2 of MPS are attracted, and the dynamic contact points 15-18 and 25-28 of MPS are connected with the undervoltage control loop; when the three-phase voltage phase sequence is incorrect, or (and) the phase is lost, or (and) the unbalance of the phase exceeds a threshold value, or (and) an MPS device and a circuit thereof are damaged, R1 and R2 are reset, and contacts 15-18 and 25-28 are reset to cut off a control loop, so that the fault safety is ensured.

The electrical connection box is suitable for connecting ships with different electrical systems to shore power.

The main breaker Q of the electric box is 4 poles (A, B, C, N), the ship power system is a three-phase three-wire insulation system, or a four-wire system with a neutral point grounded, or a ship-borne low-voltage shore power box of the three-wire system with a ship body as a neutral line loop can be connected with the electric box.

The safety control circuit of the connecting box can meet various safety technical requirements of international and domestic standards/specifications.

The safe control circuit established by the ship-shore linkage principle and the interlocking principle for the power connection box can realize the following conditions that the main breaker Q cannot be switched on and instantaneously trips when the main breaker Q is switched on: the auxiliary power supply loses power; plug connector connection failure (a safety circuit is not established); flexible cable fault of connecting shore power; fourthly, the emergency cutting-off facility acts; MPS not attracting or resetting; tripping on the ship side shore power breaker due to faults; and any one protection action of other reserved port protection and interlocking devices.

The modular power supply circuit board is beneficial to realizing standardization of low-voltage high-capacity shore power connection box products in ports.

The electrical components in the power connection box circuit are all standard electrical products, wherein shore power output of the shore side power supply point and shore power input interfaces of the ship side power receiving point are international standard single type accessories, and the standards are unified; all the elements in the power connection box are connected by hard wires specified by international standards and CCS specifications, so that the power connection box is easy to manufacture and convenient to maintain, and is beneficial to realizing standardization of port low-voltage large-capacity shore power connection box products.

Examples of electrical box applications:

as shown in fig. 4, a ship access low-voltage shore power special flexible cable (hereinafter referred to as a flexible cable, chinese patent No. 201920185630.8) is used to connect an electric connection box with a ship-mounted low-voltage single-circuit shore power box (hereinafter referred to as a shore power box, chinese patent No. 202010263258.6), and the connection mode of the shore power box and the electric connection box is the shore power connection mode described in a diagram 501 according to IEC60309-5:2017 standard and a diagram a.1 according to QGDW11468.4-2015 standard, as shown in fig. 5.

The working principle of the low-voltage high-capacity shore power connection box circuit is as follows:

when a port shore power supply is connected to an incoming line end A, B, C, N of an electric connection box, if three-phase voltage is normal and the phase sequence is correct, 2 output relays R1 and R2 of MPS are attracted, and dynamic on-off contacts 15-18 and 25-28 of MPS are switched on an under-voltage control loop to allow Q to be switched on; if the phase sequence of the three-phase voltage is incorrect or the phase (sum) is missing or the phase (sum) imbalance exceeds the threshold value or (sum) MPS device and the circuit thereof is damaged, R1 and R2 are reset, the contacts 15-18 and 25-28 are reset to cut off the control loop, and Q cannot be switched on.

(2) As shown in fig. 4, a plug XP at one side of the power receiving box is installed at the end of the shore side of the flexible cable, a marine connector XP1 is installed at the end of the side of the flexible cable, and when the plug XP is inserted into sockets XS and XP1 of the power receiving box and is inserted into an input port XS1 of the shore power box, the undervoltage tripping circuits of the power receiving box main circuit breaker Q and the shore power box main circuit breaker QF are connected.

And thirdly, switching on the Q of the power connection box and the QF of the shore power box, and switching on the shore power.

The ship side can turn off the button switch SA and does not allow the power box to be switched on.

The main circuit breaker Q of the positive power connection box is tripped due to faults such as overload and short circuit, the fault tripping signal of the auxiliary contact AUX indicates that 15/16 of the contact SY is broken, and the low-voltage loop of the main circuit breaker QF of the ship side shore box is cut off to enable QF to be tripped.

Sixthly, when a three-phase multifunctional monitor MPS of the power connection box monitors overvoltage, a contact R1 resets, when undervoltage occurs, a contact R2 resets, when the phase sequence of three-phase voltage is incorrect, or (and) the phase loss or (and) the phase imbalance exceeds a threshold value or (and) an MPS device and a circuit of the MPS device is damaged, R1 and R2 both reset, contacts 15-18 and 25-28 reset to cut off an undervoltage control loop of Q, and Q trips.

When lightning or surge overvoltage occurs, the three-phase lightning protection and surge protection device SPD operates to discharge the overvoltage formed by the lightning and the surge to the ground.

In the process of trying to electrically pull out the ship-side connector XP1 or the shore-side plug XP, the control contacts P1, P2, P3 and P4 in the safety control loop are disconnected before the main contacts, so that the undervoltage protection loops on the two sides of the shore are de-energized, and the circuit breakers Q and QF are tripped simultaneously; before the ship-side connector XP1 or the shore-side plug XP is not spliced, the Q of the power receiving box cannot be switched on, so that live splicing cannot occur.

When a fault protection action occurs to a self-supporting shore-side power box or a ship-side shore power box (comprising a flexible cable and an auxiliary power supply which are connected with shore power), or a cut-off button 1S of the power box is not reset, or a cut-off button S of the shore power box is not reset, a safety loop established by control contacts P1, P2, P3 and P4 is cut off, circuit breakers on both sides of a ship and a shore cannot be switched on, and instantaneous tripping of the switched-on state is realized.

In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.

Claims

1. The multifunctional low-voltage large-capacity shore power connection box circuit for the port is characterized by comprising a three-phase lightning protection and Surge Protector (SPD), a main circuit breaker (Q) of a connection box, a three-phase multifunctional Monitor (MPS), a fuse (1 FU), a fuse (2 FU), a fuse (3 FU), a fuse (1F), a fuse (2F), a fuse (3F), a fuse (4F), a fuse (5F), a current transformer (T), a power indicator lamp (H) and a multifunctional instrument (P), wherein the main circuit breaker (Q) is provided with an electronic release (PR 222 DS/PD), one end of the three-phase lightning protection and Surge Protector (SPD) is grounded, the other end of the three-phase lightning protection and Surge Protector (SPD) is respectively connected with an A phase, a B phase and a C phase of a shore power supply through the fuse (1 FU), the fuse (2 FU) and the fuse (3 FU), and an L1 end, an L2 end and an L3 end of the three-phase multifunctional Monitor (MPS) are respectively connected with the A phase, the shore power supply through the fuse (1F), the fuse (2F), The intelligent multifunctional meter comprises a B phase and a C phase, wherein an L1 end, an L2 end and an L3 end of the multifunctional meter P are respectively connected with an L1 end, an L2 end and an L3 end of a three-phase multifunctional monitor MPS, an N end of the multifunctional meter P is connected with an N phase of a port shore power supply, an In end of the multifunctional meter P is grounded, a power indicator lamp H is connected between an L1 end and an L2 end of the three-phase multifunctional monitor MPS, a four pole connected with a main contact inlet end of a main circuit breaker Q of the box is respectively connected with the N phase, the A phase, the B phase and the C phase of the port shore power supply, a four pole connected with a main contact outlet end of the main circuit breaker Q of the box is respectively connected with an N end, an L1 end, an L2 end and an L3 end of a junction box socket XS, a current transformer T arranged on a main circuit of the shore power supply is In a star connection method, one end of a secondary winding of the current transformer T is grounded, the other end of the multifunctional meter P is respectively connected with an Ia end, an Ib end of a SY end and an end of a trip end 3 box connected with a fault signal indicating socket of the SY terminal of the main circuit breaker Q of the junction box XS, Between the ends P4, one ends of a fuse 4F and a fuse 5F are connected with the positive pole and the negative pole of a DC24V power supply, the other end of the fuse 4F is connected with one end of a voltage-losing coil YU of a main circuit breaker Q of a junction box, the other end of the voltage-losing coil YU of the main circuit breaker Q of the junction box is connected with the end P1 of a junction box socket XS, and the other end of the fuse 5F is connected with a cut-off button 1S, the end 15-18 of an output relay R1 movable contact of a three-phase multifunctional monitor MPS and the end 25-28 of an output relay R2 movable contact of the three-phase multifunctional monitor MPS in series and then is connected with the end P2 of the junction box socket XS.

2. The multifunctional low-voltage large-capacity shore power connection box circuit for the port as claimed in claim 1, wherein the model of the three-phase lightning protection and surge protection device SPD is 3 XOVR BT23N-8KA/20 uS; the model of the three-phase multifunctional monitor MPS is CM-MPS.43; the multifunctional meter P is model IM 301.

3. The multifunctional low-voltage large-capacity shore power connection box circuit for the port as claimed in claim 1, wherein the electronic release PR222DS/PD provided on the main breaker Q is provided with a wireless communication unit BT030, and the wireless communication unit BT030 is connected to a test connector on the front panel of the main breaker Q, and is used for downloading operation data and performing communication through a 5G mobile phone or a portable computer.