CN112152114A - Low-capacity low-voltage shore power box circuit - Google Patents

Abstract

The invention discloses a small-capacity low-voltage shore power box circuit, wherein an inlet wire of a switch XK of a marine interlocking switch socket is connected with a shore power supply wire from a port, a connector XP of the marine interlocking switch socket leads out a phase wire, an N wire and a PE wire and is connected with an inlet wire end of a main circuit breaker Q, the PE wire led out from the connector XP is also connected with a marine ground PE, an outlet wire of the main circuit breaker Q is connected with a marine main distribution board shore power switch, an under-voltage tripper coil YU of the main circuit breaker Q, an emergency cut-off button SJ, a local stop button S and a VO dynamic break contact of an equipotential monitoring device are connected in series, two ends of the series circuit are connected with a DC24V control power supply, a coil of a relay KA is connected with a dynamic closing auxiliary contact Q1-2 of the main circuit breaker Q in series, and the series circuit is connected with. The invention can be used for newly manufacturing or modifying the small-capacity low-voltage shore power box, and has the advantages of low cost, convenient use, safety and reliability.

Description

Low-capacity low-voltage shore power box circuit

Technical Field

The invention relates to a small-capacity low-voltage shore power box circuit, and belongs to the technical field of ship electrical equipment.

Background

Regulations for limiting exhaust emission of ships during port-entry in various countries around the world are becoming stricter, and documents are issued sequentially at home and abroad to stipulate that the operation of a generator on a ship needs to be stopped during port-entry of the ship, and shore power is used as a power supply of the ship. The harbour ships use shore power and have become a great development trend in the shipping industry.

In recent years, relevant departments in China release a series of specifications and standards for constructing port and wharf shore power supply facilities for using shore power during the process of advancing ships to berth.

The regulations of 'legal inspection rules for ships and offshore facilities-inland river ship legal inspection technical rules 2018 modification notice' issued by the maritime administration of China and the regulations of 'steel inland river ship construction specification modification notice 2019, item 3 electrical equipment' stipulate: "ship electricity and shore electricity should be connected through a plug and a socket. The plug and receptacle are designed to ensure that incorrect connections do not occur and that hot-plugging cannot occur, and the plug and receptacle are to comply with a recognized standard (the recognized standard to be complied with is IEC 60309-5:2017 part5 of plug, receptacle and coupler for industrial use: requirements for dimensional compatibility and interchangeability of low voltage shore power connection system (LVSC) plugs, receptacles, marine connectors and marine access, or other equivalent standards). The plug of the ship should be one of the following specifications according to the load supplied by shore power during the harboring period of the ship: (1)400V, 63A; (2)400V, 125A; (3)400V, 250A'.

Q/GDW 11468.4-2016 Port Shore Power Equipment Specification, part 4, issued by national grid corporation: the requirements in ship shore connection and interface device "a: the connection of the shore power ship of the port is to adopt the connection of the whole flexible cable, and the connection devices at the two ends of the shore side and the ship side are to adopt the connection devices (generally called accessories) meeting the regulations, and the connection mode is shown in figure A.1. The figure A.1 refers to figure 1 in the attached drawings of the specification. The connection mode of the cable at both sides of the shore side and the ship side is consistent with that of the cable given by IEC standard in figure A.1 of the specification Q/GDW 11468.4-2016, see the attached figures 2 and 3 of the specification.

In fig. 1, 2, and 3, the cable is connected to shore power at the shore-side power supply point by using a "plug and socket-outlet", and connected to shore power at the ship-side power receiving point by using a "ship coupler", which is composed of a "ship connector" and a "ship entrance let" (ship input socket).

IEC 60309-5:2017 "PLUGS, SOCKET-OUTLETS AND COUPLERS FOR INDUSTRIAL PURPOSES Part5: Dimensional compatibility AND interchange requirements FOR PLUGS, SOCKET-output pads AND pads FOR low-voltage shore connection systems (LVSC) (Part 5 of plug, SOCKET AND coupler FOR INDUSTRIAL use: requirements FOR Dimensional compatibility AND interchangeability of SOCKETs, PLUGS FOR marine low-voltage shore electrical connection systems) AND IEC/IEEE 80005-3: 2016 "availability connections in port-Part 3: Low Voltage Shore Connection (LVSC) Systems-General requirements" specifies that the main electrodes of the plug receptacle and of the ship coupler should have 3 phase electrodes L1, L2, L3 plus 1 ground electrode E, while the auxiliary electrodes should have 4 control electrodes P1, P2, P3, P4, i.e. 3P + E + P1, P2, P3, P4, the contact arrangement being referred to in the description of figures 4 and 5.

The IEC standard requires plug sockets and marine coupler contacts in shore electrical systems, which are provided for international ports or international cruise ships in section 2 of the port shore power plant specification with Q/GDW 11468.2-2016: the low-voltage large-capacity power supply' compatible large-capacity ship-mounted shore power box is completely necessary. Otherwise, as in the IEC/ISO/IEEE 80005 standard: a ship that does not use the present standard may find it unable to connect to a satisfactory shore power supply. "

According to IEC 80005-3: 2016 standard requirements, shore power accessories should be hot pluggable proof, and the requirements should be met with control contacts in the plug and jack and ship power couplers and a dedicated cable with 4 control wires. The cost of a set of marine coupler meeting IEC 60309-5:2017 standard and a special connecting cable (also needing 3P + E + P1, P2, P3 and P4) is far higher than the price of a low-capacity low-voltage shore power box; the international standard shore power safety control loop technology is complex, and has difficulty in popularization in small ships in inland rivers.

The inland river small and medium-sized ship which is large in area and only sails at home is only parked at an inland river port wharf, the requirement on the shore capacitance is low (below 125A), a shore power supply method which is compatible, convenient to use and low in investment cost is urgently needed, and the requirement that the ship power and the shore power are connected through a plug and a socket and are provided by a standard can be met. The design of plug and socket should ensure that incorrect coupling can not appear to ensure can not hot plugging's requirement, make the interface standard that current bank electric system exists differ, the security subalternation problem can effectively be solved.

The invention designs a circuit of a small-capacity low-voltage shore power box according to the principle of combining advancement and practicability, unity and flexibility and reliability and economy, can be used for newly manufacturing or modifying a shipborne small-capacity low-voltage shore power box, has low cost, convenient use, safety and reliability, is convenient to realize standardization, and is an effective measure for promoting the shore power to be used during the docking of small and medium-sized ships in inland rivers.

Disclosure of Invention

The invention aims to provide a small-capacity low-voltage shore power box circuit which is suitable for small-capacity low-voltage shore power boxes of ports and wharfs with rated voltage values of 400V or below and rated current values of 16A, 32A, 63A and 125A. The power supply device is arranged on the ship side and receives power supplied by an onshore power grid to the ship.

The purpose of the invention is realized by the following technical scheme:

a small-capacity low-voltage shore power box circuit comprises a main breaker Q, a relay KA, a local stop button S, an emergency cut-off button SJ, a marine interlocking switch socket and an equipotential monitoring device VO, wherein the marine interlocking switch socket comprises a switch XK, a socket XS and a connector XP, the incoming line of the switch XK of the marine interlocking switch socket is connected with a shore power line from a port, the shore power line comprises a phase line, an N line and a PE line, the connector XP of the marine interlocking switch socket leads out the phase line, the N line and the PE line and is connected with the incoming line end of the main breaker Q, the PE line led out from the connector XP is also connected with a PE of a ship ground, the outgoing line of the main breaker Q is connected with a shore power switch of a ship main distribution board, the undervoltage tripper coil YU of the main breaker Q, the emergency cut-off button SJ, the local stop button S and the equipotential monitoring device VO are in series connection with power cut-off contacts, and the two, the coil of relay KA and main circuit breaker Q's dynamic close auxiliary contact Q1-2 establish ties and series circuit is parallelly connected with main circuit breaker Q undervoltage release coil YU, and normally open contact KA1-2 of relay KA establishes ties and inserts the tripping separating brake return circuit of last level circuit breaker, and normally closed contact KA3-4 of relay KA establishes ties and inserts the warning return circuit, N line, the PE line that the connector XP of marine interlock switch socket was drawn forth insert equipotential monitoring device VO respectively, as equipotential monitoring signal.

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

the marine interlocking switch socket is CLK-shaped.

The single-phase shore power box is a 3-contact marine interlocking switch socket in a 2-phase grounding mode, and the three-phase shore power box is a 5-contact marine interlocking switch socket in a 3-phase neutral line grounding mode.

In the small-capacity low-voltage shore power box circuit, the tripping signal contact Q7-8 of the main circuit breaker Q provides a signal for the related circuit breaker to carry out linkage tripping; the auxiliary contacts Q3-4, Q5-6 of the circuit breaker Q are used to electrically interlock with the ship or provide an on/off position signal for the main circuit breaker Q.

Compared with the prior art, the invention has the beneficial effects that: the small-capacity low-voltage shore power box circuit can be used for newly manufacturing or modifying a small-capacity low-voltage shore power box, is low in cost, convenient to use, safe, reliable and convenient to realize standardization, and is a guarantee for promoting shore power to be used during the docking of small and medium-sized ships in inland rivers. The invention has the interlocking device of the socket and the connector plug and the holding device of the socket and the connector plug, can prevent hot plugging and ensure the safety of using shore power. The coil of the safety relay is connected with the coil of the undervoltage release of the main circuit breaker in parallel or in series, and when the main circuit breaker fails to be protected, the safety relay provides backup protection.

Drawings

FIG. 1 is a schematic view of the connection of a flexible cable on the shore side to the side of a ship;

FIG. 2 is a schematic view of a cable assembly in use;

FIG. 3 is a schematic view of the use of the cable accessory;

FIG. 4 is a view of a ship inlet contact arrangement;

FIG. 5 is an IEC standard power plug and receptacle contact assignment diagram;

figure 6 is a view of a low capacity shore power connector contact layout;

FIG. 7 is a schematic diagram of a CB/T3897-2011 standard electrical accessory contact arrangement;

FIG. 8 is a circuit diagram of a small-capacity single-phase low-voltage shore power box of the present invention;

FIG. 9 is a circuit diagram of a small-capacity three-phase low-voltage shore power box of the present invention;

fig. 10 is a schematic diagram of the external circuit of the small-capacity low-voltage shore power box.

Detailed Description

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

Q/GDW 11468.3-2016 Port Shore Power Equipment Specification part 3, issued by national grid corporation: low voltage low capacity power supply clause 5.2.1.2 regulation: the power supply mode of the small-capacity shore power supply is an alternating-current single phase or an alternating-current three phase, the rated voltage single phase is 220V, and the rated voltage three phase is 380V; Q/GDW 11468.4-2016, clause 6.4.2, specifies: the maximum current value of the small-capacity shore power connector is 125A; item 6.4.3 defines the electrical parameters and functions of a small-capacity shore power connector as: "L1-ac power core, L2-ac power core, L3-ac power core, E-ground (E), N-neutral"; article 6.4.4 gives "low capacity shore power connector contact arrangement" and specifies that a three-phase "low capacity shore power connector should contain 5 pairs of contacts. The contact arrangement is shown in figure 1 "(note: figure 1 is the attached figure 6 in the specification); the Q/GDW 11468.4-2016 Specification annex A specifies in "Shore Power supply mode": the power supply mode of the low-voltage small-capacity shore power system means that the output voltage of the port shore-based power supply system is 220V or 380V and is used by power-receiving ships.

The invention is matched with the Q/GDW 11468.3-2016 specification and JTS155-2019 'wharf shore power facility construction technical specification', can be compatible with the power supply modes of Q/GDW.3-2016 and Q/GDW.4-2016 small-capacity shore power supplies, and also conforms to the 'reserved cable inlet wire connection terminal' specified by the 4.2.7.2 th specification of JTS155-2019, so that the reserved cable inlet wire connection terminal can be connected by adopting an M10 terminal when a connector is not used. "

The invention divides a small-capacity low-voltage shore power box of a ship power receiving device into an alternating-current single-phase shore power box with the rated voltage of 220V and the rated current value of 63A or below; the rated voltage of the alternating current three phase is 380V, the rated current value is 125A or below, and the rated voltage is consistent with the electrical parameters of the shore power supply facility interface arranged at the port specified by the national grid company.

The specific technical scheme of the invention is that GB-12321 'marine 16A-125A plug socket and connector' or other appropriate socket and connector in equivalent standard are adopted to replace IEC 80005-3: 2016 and IEC 60309-5: a ship electrical coupler in the 2017 standard; the substitute is a marine plug connector product independently developed in China, and the contact definition and the rated voltage value and the rated current value of the substitute are consistent with those of a Q/GDW 11468 standard small-capacity shore power supply.

The plug socket and the connector of the GB-12321 standard for the ship 16A-125A are provided with the plug socket with the protection grade of IP56, an interlocking device thereof and a holding device of the plug socket and the connector plug, can prevent the plug pin of the plug from being electrified before being normally plugged with the socket or the connector, can prevent the plug from being pulled out when the plug pin is electrified, and can have the functions of keeping the plug or the connector in a normal position and preventing the plug or the connector from being pulled out accidentally when the plug or the connector is normally plugged.

The circuit of the small-capacity low-voltage shore power box adopts the socket and the connector, has excellent performance, safety, reliability, low price and convenient use, is favorable for popularizing shore power for small and medium-sized ships in harbor in inland rivers and realizing standardization of the small-capacity low-voltage shore power box, and specifically comprises the following steps:

the invention relates to a small-capacity single-phase low-voltage shore power box, which selects a socket and a connector (rated voltage 220V, frequency 50 or 60Hz, rated current 63A and below, IP56) with 3 contacts (2P + ground) in GB-12321 or other equivalent standards, and refers to 2P + ground in a contact arrangement schematic diagram of figure 7 of the specification. The basic circuit diagram of the small-capacity single-phase low-voltage shore power box is shown in fig. 8.

The invention relates to a small-capacity three-phase low-voltage shore power box, which adopts a socket and a connector (rated voltage 380V, frequency 50 or 60Hz, rated current 125A and below, IP56) with 5 contacts (3P + N + ground) in GB-12321 or other equivalent standards, and refers to 3P + N + ground in a contact arrangement schematic diagram of figure 7 in the specification. The basic circuit diagram of the small-capacity three-phase low-voltage shore power box is shown in fig. 9.

XS and XP are the marine 16A-125A socket and connector of GB-12321 standard, have the function of preventing hot plugging, and other electrical properties all meet the requirements of relevant standard standards. The marine interlocking switch socket 1 can be a CLK type marine interlocking switch socket, and comprises a switch XK, a socket XS and a connector XP, wherein each phase of the switch XK is respectively communicated with each phase of the socket XS. The ship electricity coupler is used for replacing an international standard ship electricity coupler, a small-capacity single-phase low-voltage shore electricity box selects a socket and a connector with 3 contacts (2P + ground), a small-capacity three-phase low-voltage shore electricity box selects a socket and a connector with 5 contacts (3P + N + ground), and rated voltage and current are selected and distributed according to the specification of the shore electricity box; the socket XS is arranged at one end of a ship side of a flexible cable connected with shore power of a port and wharf, the connector XP is arranged at one end of an incoming line flexible cable of the small-capacity low-voltage shore power box, the other end of the incoming line flexible cable is connected with a side terminal of a power incoming line in the small-capacity low-voltage shore power box, (the length of the incoming line flexible cable is about 2 meters generally or is configured according to actual needs), and the external wiring request of the small-capacity low-voltage shore power box is shown in the attached drawing 10 of.

An inlet wire terminal is arranged on the inlet wire side in the shore power box, the inlet wire terminal of the small-capacity single-phase low-voltage shore power box is provided with a wiring stud L, N, PE, the inlet wire terminal of the small-capacity three-phase low-voltage shore power box is provided with copper wiring studs L1, L2, L3 and N, PE, the diameters of the studs are 16A, M6, 32A, 63A, M8 and 125A, M10; if the space in the box is convenient for the connection of the inlet wire flexible cable, the wiring terminal at the inlet side of the main breaker in the shore power box can be utilized.

Q is main circuit breaker, and 2 utmost point circuit breakers are chooseed for use to the single-phase low-voltage bank electricity case of minicapacity, and 4 utmost point circuit breakers are chooseed for use to the three-phase low-voltage bank electricity case of minicapacity, and the electric current is according to bank electricity case specification apolegamy, all possesses the short circuit and overflows release and undervoltage release (YU), takes trip signal contact and auxiliary contact, also can choose for use the electric operation and possess the circuit breaker of more functions.

1F, 2F, 3F, 4F and 5F are fuses which are used for short-circuit protection of a protection and measurement voltage loop, rated current 10A and fusible core current 6A.

According to IEC 80005-3: the 2016 standard specifies a voltage level less than 60V dc or 25V ac. The safety control loop of the invention adopts a DC24V power supply, can be powered by a ship charging and discharging board, and can also be provided by other modes.

The AC220V working power supply of the three-phase shore power box is provided by a transformer TC, the voltage ratio is 380/220V, and the working power supply is provided for instruments and relay protection devices.

The current transformers 1TA, 2TA and 3TA are current transformers which are configured when meters and relay protection devices need to be installed, primary side currents are selected and matched according to rated currents of the shore power box, and secondary side currents are selected and matched according to currents of the meters.

VO is an equipotential monitoring device (Chinese patent product 'equipotential protection device for low-voltage shore power system of ship', patent number: 201920182300.4); the sampling point of VO operation is PE of a shore power box and N of shore power, and when the potential difference between a ship hull and the shore ground exceeds a threshold value, the main breaker Q is operated to trip.

And 1X is a protection and measurement signal loop interface. The voltage signal of the metering instrument and the relay protection device (for example, positive phase sequence protection, open phase protection, overvoltage/undervoltage protection, surge protection, earth fault protection and the like can be selected and matched as required), can be accessed from a 1X protection and measurement voltage loop, and the current signal can be accessed from a 1X protection and measurement current loop; if not, the protection and measurement voltage loop should be open-circuited, and the protection and measurement current loop should be short-circuited.

And 2X is an interface of an emergency cut-off and protection trip safety loop. The equipotential monitoring device protects the movable contact VO and the emergency cut-off button SJ and is connected between the 2X terminals 1 and 2 in series, the cable management system abnormal condition protection and the movable contacts of other relay protection devices can be connected between the 2X terminals 1 and 2 in series, any protection action is carried out, and the main breaker Q trips.

When shore power is not used, a button S with a self-locking function is pressed down, and the DC24V is cut off to control the power supply; when shore power is ready to be connected, the button S with the self-locking function is reset, the control power supply DC24V is switched on, and the undervoltage trip coil of the main circuit breaker Q is electrified.

When one end of a shore side of a flexible cable connected with shore power is connected with a shore side electric box, if a switch XK on a socket XS at one end of a shore power flexible cable ship side is in a connection position, a connector XP of an incoming flexible cable of the shore power box is interlocked and cannot be inserted, the connector XP can be inserted only when the switch XK on the socket is disconnected, the switch XK on the socket is connected after the connector is inserted, and a shore power indicator lamp H is bright (H is white or green, 220V is selected for a small-capacity single-phase low-voltage shore power box, and 380V is selected for a small-capacity three-phase low-voltage shore power box); at this moment, the connector XP on the incoming line flexible cable of the shore power box is kept to be unplugged, and only after the switch XK on the socket is disconnected, the connector XP can be unplugged.

After the main circuit breaker Q is switched on, shore power is switched on to supply power to a shore power switch of a ship main distribution board; pressing a local stop button S or pressing an emergency stop self-locking button SJ located at other places, or pressing any one protection action in a 2X protection tripping safety loop interface, and tripping a main breaker Q under voltage; the auxiliary contacts Q3-4, Q5-6 of the main breaker Q can be used for interlocking with ship electricity or providing an opening/closing position signal of the main breaker Q of the shore power box for related control, protection or signal loops; the trip signal contact Q7-8 of the main circuit breaker Q may be used to trip an associated circuit breaker.

The relay KA is a safety relay (voltage type intermediate relay), a coil of the relay KA is connected with the undervoltage release coil YU in parallel through a movable-closing auxiliary contact Q1-2 of the main circuit breaker Q, the voltage grade of the relay KA is the same as that of the undervoltage release coil YU, and the contact of the relay KA is not less than 1 and normally open and 1 and normally closed; when the main breaker Q is in emergency cut-off or fault protection action, if the main breaker Q fails to be protected, the relay KA provides backup protection, and the normally open contact KA1-2 and the normally closed contact KA3-4 are used for jumping the previous or next breaker and connecting an alarm loop. The coil of the current type intermediate relay can also be connected with the undervoltage release coil YU of the main breaker in series for the safety relay, and when the Q protection of the main breaker fails, the KA provides backup protection.

The sockets and connectors of the small-capacity single-phase low-voltage shore power box and the three-phase low-voltage shore power box are respectively provided with a ground contact PE, and the small-capacity single-phase low-voltage shore power box and the three-phase low-voltage shore power box are directly connected with a grounding stud PE of the box body, so that a connecting wire between a ship shell and the shore ground is not required to be installed when a ship arrives at a port.

In the basic circuit diagram of the small-capacity single-phase low-voltage shore power box and the small-capacity three-phase low-voltage shore power box, a voltage and current loop interface 1X for protection and measurement and a tripping loop interface 2X for emergency cut-off and protection are arranged, so that optional conditions are created for the transformation of the original shore power box, a protection device is convenient to add, debugging and maintenance are facilitated, and the circuit standardization of a product is facilitated.

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 (4)

1. A small-capacity low-voltage shore power box circuit is characterized by comprising a main breaker Q, a relay KA, a local stop button S, an emergency cut-off button SJ, a marine interlocking switch socket and an equipotential monitoring device VO, wherein the marine interlocking switch socket comprises a switch XK, a socket XS and a connector XP, an inlet wire of the switch XK of the marine interlocking switch socket is connected with a shore power supply wire from a port, the shore power supply wire comprises a phase wire, an N wire and a PE wire, the connector XP of the marine interlocking switch socket leads out the phase wire, the N wire and the PE wire and is connected with an inlet wire end of the main breaker Q, the PE wire led out by the connector XP is also connected with a PE of a ship ground, an outlet wire of the main breaker Q is connected with a shore power switch of a main distribution board of the ship, an undervoltage tripper coil YU, the emergency cut-off button SJ, the local stop button S, the equipotential monitoring device VO is connected in series, and two ends of a series circuit are connected with a DC, the coil of relay KA and main circuit breaker Q's dynamic close auxiliary contact Q1-2 establish ties and series circuit is parallelly connected with main circuit breaker Q undervoltage release coil YU, and normally open contact KA1-2 of relay KA establishes ties and inserts the tripping separating brake return circuit of last level circuit breaker, and normally closed contact KA3-4 of relay KA establishes ties and inserts the warning return circuit, N line, the PE line that the connector XP of marine interlock switch socket was drawn forth insert equipotential monitoring device VO respectively, as equipotential monitoring signal.

2. A low capacity, low voltage shore power box circuit according to claim 1, wherein said marine interlock switch socket is of the CLK type.

3. A low capacity, low voltage shore power box circuit, as claimed in claim 1, wherein said single phase shore power box is a3 contact marine interlock switch socket in the form of a 2-phase earth, and said three phase shore power box is a 5 contact marine interlock switch socket in the form of a 3-phase neutral earth.

4. A small capacity low voltage electricity shore box circuit according to claim 1, wherein said trip signal contact Q7-8 of main circuit breaker Q provides a signal to the associated circuit breaker for gang tripping; the auxiliary contacts Q3-4, Q5-6 of the circuit breaker Q are used to electrically interlock with the ship or provide an on/off position signal for the main circuit breaker Q.

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