A small capacity low voltage shore power box circuit

Abstract

The invention discloses a small-capacity low-voltage shore power box circuit, wherein the incoming line terminal of the switch XK of the ship interlock switch socket is connected to the shore power line from the port, the connector XP of the ship interlock switch socket leads out the phase line, the N line, the PE line and is connected to the incoming line terminal of the main circuit breaker Q, the PE line led out by the connector XP is also connected to the ship ground PE, the outgoing line terminal of the main circuit breaker Q is connected to the shore power switch of the ship main distribution board, the undervoltage release coil YU of the main circuit breaker Q, the emergency cut-off button SJ, the local stop button S, and the equipotential monitoring device VO moving-breaking contacts are connected in series, and the two ends of the series circuit are connected to the DC24V control power supply, the coil of the relay KA is connected in series with the moving-closing auxiliary contact Q1-2 of the main circuit breaker Q, and the series circuit is connected in parallel with the undervoltage release coil YU of the main circuit breaker Q. The invention can be used for the new construction or modification of a small-capacity low-voltage shore power box, with low cost, convenient use, safety and reliability.

Description

Technical Field

[0001] The invention relates to a small-capacity low-voltage shore power box circuit, belonging to the technical field of ship electrical equipment. Background Art

[0002] Regulations around the world on limiting exhaust emissions from ships while at port are becoming increasingly stringent, with both domestic and foreign countries issuing documents stipulating that ship generators must be stopped while at port and that shore power should be used as the ship's power source. Using shore power for ships at port has become a major development trend in the shipping industry.

[0003] In recent years, relevant departments in my country have issued a series of specifications and standards for the construction of shore power supply facilities at ports and terminals in order to promote the use of shore power by ships while at port.

[0004] The "2018 Amendment Notice of the Rules for the Mandatory Inspection of Ships and Offshore Facilities - Technical Rules for the Mandatory Inspection of Inland Vessels" issued by my country's Maritime Safety Administration and the CCS "2019 Amendment Notice on the Construction Specifications for Steel Inland Vessels Part 3 Electrical Equipment" stipulate that "the ship power and shore power should be connected through plugs and sockets. The design of the plugs and sockets should ensure that incorrect connection does not occur and that they cannot be plugged in and out under power. The plugs and sockets should comply with recognized standards (the recognized standards to be complied with are IEC 60309-5:2017 "Industrial Plugs, Sockets and Couplers Part 5: Dimensional Compatibility and Interchangeability Requirements for Low Voltage Shore Connection System (LVSC) Plugs, Sockets, Marine Connectors and Ship Access" or other equivalent standards). The plugs equipped on the ship should be selected from one of the following specifications based on the load size supplied by the shore power while the ship is at port: (1) 400V, 63A; (2) 400V, 125A; (3) 400V, 250A".

[0005] Q / GDW 11468.4-2016 "Technical Specifications for Port Shore Power Equipment Part 4: Ship-Shore Connection and Interface Equipment" A issued by the State Grid Corporation requires: "The port shore power ship-shore connection should be connected using a whole flexible cable, and the connection devices on both the shore and ship sides should use connection devices that comply with regulations (commonly known as accessories). The connection method is shown in Figure A.1." Please see the attached figure of the instruction manual for Figure A.1 Figure 1 The connection method of the cable at both ends of the shore side and the ship side given in Figure A.1 of Q / GDW 11468.4-2016 is consistent with that given in the IEC standard. Please see the attached manual. Figure 2 , 3 .

[0006] exist Figure 1 , 2, 3 show that the cable is connected to the shore power at the shore power supply point using a "plug and socket-outlet", and is connected to the shore power at the ship power receiving point using a "ship coupler". The ship coupler consists of a "ship connector" and a shore power "ship inlet" (ship input socket).

[0007] IEC 60309-5:2017 "PLUGS, SOCKET-OUTLETS AND COUPLERS FOR INDUSTRIAL PURPOSES Part 5: Dimensional compatibility and interchangeability requirements for plugs, socket-outlets ship connectors and ship inlets for low-voltage shore connection systems (LVSC)" and IEC / IEEE 80005-3:2016 "Utility connections in port-Part 3:Low Voltage Shore Connection (LVSC) Systems-General Requirements" (Port Public Connection Facilities - Part 3: Low Voltage Shore Power Connection System - General Requirements) stipulates that the main electrodes of plugs, sockets and marine couplers should have three phase electrodes L1, L2, L3 plus one ground electrode E, and the auxiliary electrodes should have four control electrodes P1, P2, P3, P4, that is, 3P+E+P1, P2, P3, P4. Please see the attachment of the instruction manual for the contact arrangement. Figure 4 , 5 .

[0008] The IEC standard requirements for plugs, sockets and marine coupler contacts in shore power systems are absolutely necessary for international ports or international voyage ships to be equipped with large-capacity shipboard shore power boxes that are compatible with Q / GDW 11468.2-2016 in "Technical Specifications for Port Shore Power Equipment Part 2: Low-voltage Large-capacity Power Sources". Otherwise, as the IEC / ISO / IEEE 80005 standard says: "Ships that do not apply this standard may find it impossible to connect to compliant shore supplies."

[0009] According to the IEC 80005-3:2016 standard, shore power accessories should be protected from live plugging and unplugging, and plugs and sockets, control contacts in ship power couplers, and special cables with 4 control lines should be used to meet the requirements. Since the cost of a set of ship couplers that meet the IEC60309-5:2017 standard plus a special connecting cable (which also needs to have 3P+E+P1, P2, P3, P4) is far more than the price of a small-capacity low-voltage shore power box; this international standard shore power safety control circuit technology is relatively complex, and it is difficult to promote it in small and medium-sized inland ships.

[0010] Small and medium-sized inland ships that sail widely and only within the country only dock at inland ports and terminals. They have a relatively small requirement for shore power capacity (125A and below). There is an urgent need for a shore power supply method that is compatible, easy to use, and has low investment costs. It must also meet the requirements of the standard that "the ship power and shore power should be connected through plugs and sockets. The design of the plugs and sockets should ensure that there will be no incorrect connection and that they cannot be plugged in and out while powered on." This will effectively solve the problems of inconsistent interface standards and poor safety in the current shore power system.

[0011] The present invention designs a circuit of a small-capacity low-voltage shore power box based on the principle of combining advancement with practicality, unity with flexibility, reliability with economy. The circuit can be used for new construction or modification of small-capacity low-voltage shore power boxes on ships. The invention has low cost, is easy to use, safe and reliable, and is easy to standardize. It is an effective measure to promote the use of shore power by small and medium-sized inland river ships during berthing. Summary of the invention

[0012] The purpose of the present invention is to provide a small-capacity low-voltage shore power box circuit, which is suitable for small-capacity low-voltage shore power boxes at ports and docks with rated voltage values ​​of 400V and below and rated current values ​​of 16A, 32A, 63A, and 125A. It is installed on the side of the ship and receives power from the shore power grid to supply power to the ship.

[0013] The purpose of the utility model is achieved through the following technical solutions:

[0014] A small-capacity low-voltage shore power box circuit comprises a main circuit breaker Q, a relay KA, a local stop button S, an emergency cut-off button SJ, a marine interlock switch socket, and an equipotential monitoring device VO. The marine interlock switch socket comprises a switch XK, a socket XS, and a connector XP. The inlet terminal of the switch XK of the marine interlock switch socket is connected to the shore power line from the port. The shore power line comprises a phase line, an N line, and a PE line. The connector XP of the marine interlock switch socket leads out the phase line, the N line, and the PE line and is connected to the inlet terminal of the main circuit breaker Q. The PE line led out by the connector XP is also connected to the ship's ground PE. The outlet terminal of the main circuit breaker Q is connected to the shore power switch of the ship's main distribution board. The main circuit breaker The undervoltage release coil YU of the device Q, the emergency cut-off button SJ, the local stop button S, and the equipotential monitoring device VO moving-break contacts are connected in series, and both ends of the series circuit are connected to a DC24V control power supply. The coil of the relay KA is connected in series with the moving-close auxiliary contact Q1-2 of the main circuit breaker Q, and the series circuit is connected in parallel with the undervoltage release coil YU of the main circuit breaker Q. The normally open contacts KA1-2 of the relay KA are connected in series to the tripping and opening circuit of the upper-level circuit breaker, and the normally closed contacts KA3-4 of the relay KA are connected in series to the alarm circuit. The N line and PE line led out of the connector XP of the marine interlocking switch socket are respectively connected to the equipotential monitoring device VO as equipotential monitoring signals.

[0015] The purpose of the utility model can also be further achieved through the following technical measures:

[0016] The aforementioned small-capacity low-voltage shore power box circuit, the model of the marine interlock switch socket is CLK type.

[0017] The aforementioned small-capacity low-voltage shore power box circuit, the single-phase shore power box uses a 3-contact marine interlocking switch socket in the form of 2-phase plus ground, and the three-phase shore power box uses a 5-contact marine interlocking switch socket in the form of 3-phase plus neutral line plus ground.

[0018] In the aforementioned small-capacity low-voltage shore power box circuit, the trip signal contact Q7-8 of the main circuit breaker Q provides a signal to the relevant circuit breakers for linkage tripping; the auxiliary contacts Q3-4 and auxiliary contacts Q5-6 of the circuit breaker Q are used to interlock with the ship power or provide the open / closed position signal of the main circuit breaker Q.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows: the small-capacity low-voltage shore power box circuit of the utility model can be used for the new construction or modification of small-capacity low-voltage shore power boxes, with low cost, convenient use, safety and reliability, and easy standardization. It is an equipment guarantee for promoting the use of shore power by small and medium-sized inland ships during berthing. The present invention is equipped with an interlocking device for the socket and the connector plug and a retaining device for the socket and the connector plug, which can prevent live plugging and unplugging and ensure the safety of using shore power. The coil of the safety relay is connected in parallel or in series with the undervoltage release coil of the main circuit breaker. When the main circuit breaker protection fails to operate, the safety relay provides backup protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection of the flexible cable on the shore side and the ship side;

[0021] Figure 2 It is a schematic diagram of the use of cable accessories;

[0022] Figure 3 It is a schematic diagram of the use of cable accessories;

[0023] Figure 4 It is the layout of the ship's inlet contacts;

[0024] Figure 5 This is the IEC standard power plug and socket contact distribution diagram;

[0025] Figure 6 This is the contact arrangement diagram of the small capacity shore power connector;

[0026] Figure 7 This is the circuit diagram of the small-capacity single-phase low-voltage shore power box of the present invention;

[0027] Figure 8 This is the circuit diagram of the small-capacity three-phase low-voltage shore power box of the present invention;

[0028] Fig. 9 It is a schematic diagram of the external circuit of the small-capacity low-voltage shore power box of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Article 5.2.1.2 of Q / GDW 11468.3-2016 "Technical Specifications for Port Shore Power Equipment Part 3: Low Voltage Small Capacity Power Supply" issued by State Grid Corporation of China stipulates: "The power supply mode of small-capacity shore power supply is AC single-phase or AC three-phase, and the rated voltage is 220V for single-phase and 380V for three-phase"; Article 6.4.2 of Q / GDW 11468.4-2016 stipulates: The maximum current value of small-capacity shore power connector is 125A; Article 6.4.3 defines the electrical parameters and functions of small-capacity shore power connector as: "L1 - AC power core, L2 - AC power core, L3 - AC power core, E - ground (E), N - neutral line"; Article 6.4.4 gives the "contact arrangement of small-capacity shore power connector" and clarifies that the three-phase "small-capacity shore power connector should contain 5 pairs of contacts. Contact arrangement see Figure 1 "(Note: Figure 1 Instructions attached Figure 6 ); Appendix A of Q / GDW 11468.4-2016 stipulates in the "Shore Power Supply Mode": "The low-voltage small-capacity shore power system power supply mode refers to the port shore-based power supply system with an output voltage of 220V or 380V for use by powered ships."

[0031] The present invention is a supporting technology for the Q / GDW 11468.3-2016 specification and JTS155-2019 "Technical Specifications for the Construction of Dock Shore Power Facilities". It is compatible with the power supply mode of the small-capacity shore power supply of Q / GDW.3-2016 and Q / GDW.4-2016, and complies with the provisions of Article 4.2.7.2 of JTS155-2019, "reserving cable entry wiring terminals for connection with M10 terminals when connectors are not available."

[0032] The present invention divides the small-capacity low-voltage shore power box of the ship power receiving device into an AC single-phase rated voltage of 220V and a rated current of 63A or less; an AC three-phase rated voltage of 380V and a rated current of 125A or less, which is consistent with the electrical parameters of the shore power supply facility interface set up in the port as stipulated by the State Grid Corporation.

[0033] The specific technical solution of the present invention is to use appropriate sockets and connectors in GB-12321 "Marine 16A ~ 125A plugs, sockets and connectors" or other equivalent standards to replace the ship power couplers in IEC80005-3: 2016 and IEC60309-5: 2017 standards; this replacement part is a marine plug-in connector product independently developed by my country, and its contact definition and rated voltage value and rated current value are consistent with the small-capacity shore power supply of Q / GDW 11468 standard.

[0034] The marine 16A~125A plugs, sockets and connectors of GB-12321 standard all have a protection level of IP56. The interlocking device and the retaining device of the socket and connector plug can prevent the plug pins from being energized before normal insertion with the socket or connector, and prevent the plug from being pulled out when its pins are energized. In addition, when the plug or connector is normally inserted, it can keep the plug or connector in the normal position and prevent it from being accidentally pulled out.

[0035] The circuit of the small-capacity low-voltage shore power box of the present invention adopts a socket and a connector, which has excellent performance, is safe and reliable, and is low in price and easy to use. It is conducive to the promotion of the use of shore power by small and medium-sized inland river ships at ports and is conducive to the standardization of small-capacity low-voltage shore power boxes. The details are as follows:

[0036] The small-capacity single-phase low-voltage shore power box of the present invention uses a socket and connector with three contacts (2P+ground) in GB-12321 or other equivalent standards (rated voltage 220V, frequency 50 or 60Hz, rated current 63A and below, IP56). Please see the 2P+ground in the contact arrangement diagram of the CB / T3897-2011 standard. The basic circuit diagram of the small-capacity single-phase low-voltage shore power box of the present invention is as follows: Figure 7 shown.

[0037] The small-capacity three-phase low-voltage shore power box of the present invention adopts a socket and connector with 5 contacts (3P+N+ground) in GB-12321 or other equivalent standards (rated voltage 380V, frequency 50 or 60Hz, rated current 125A and below, IP56). Please see the 3P+N+ground in the contact arrangement diagram of the CB / T3897-2011 standard. The basic circuit diagram of the small-capacity three-phase low-voltage shore power box of the present invention is as follows: Figure 8 shown.

[0038] XS and XP are marine 16A~125A sockets and connectors in accordance with GB-12321 standard, with the function of preventing live plugging and unplugging, and other electrical performances meet the requirements of relevant specifications and standards. The marine interlocking switch socket 1 can use the marine interlocking switch socket of model CLK, which includes a switch XK, a socket XS, and a connector XP. Each phase of the switch XK is connected to each phase of the socket XS. The present invention uses it to replace the international standard ship power coupler. The small-capacity single-phase low-voltage shore power box uses a socket and connector with 3 contacts (2P+ground), and the small-capacity three-phase low-voltage shore power box uses a socket and connector with 5 contacts (3P+N+ground). The rated voltage and current are selected according to the specifications of the shore power box; the socket XS is installed on the ship side of the soft cable connected to the port terminal shore power, and the connector XP is installed at one end of the incoming soft cable of the small-capacity low-voltage shore power box. The other end of the incoming soft cable is connected to the power incoming side terminal of the small-capacity low-voltage shore power box (the length of the incoming soft cable is generally about 2 meters or configured according to actual needs). For the external wiring of the small-capacity low-voltage shore power box, please refer to the attached manual. Fig. 9 .

[0039] Incoming terminals are set on the incoming side of the shore power box. The incoming terminals of small-capacity single-phase low-voltage shore power box are equipped with wiring studs L, N, PE. The incoming terminals of small-capacity three-phase low-voltage shore power box are equipped with copper wiring studs L1, L2, L3, N, PE. The stud diameters are 16A≥M6, 32A, 63A≥M8, and 125A≥M10. If the space inside the box is convenient for connecting the incoming soft cable, the wiring terminals on the incoming side of the main circuit breaker in the shore power box can be used.

[0040] Q is the main circuit breaker. Small-capacity single-phase low-voltage shore power box uses 2-pole circuit breakers, small-capacity three-phase low-voltage shore power box uses 4-pole circuit breakers. The current is selected according to the specifications of the shore power box. They are all equipped with short-circuit and over-current releases and undervoltage releases (YU), with trip signal contacts and auxiliary contacts. Electric operation and circuit breakers with more functions can also be selected.

[0041] 1F, 2F, 3F, 4F, and 5F are fuses used for short-circuit protection of protection and measurement voltage circuits. The rated current is 10A and the fuse core current is 6A.

[0042] The voltage level specified by IEC80005-3:2016 standard is less than DC 60V or AC 25V. The safety control circuit of the present invention uses a DC24V power supply, which can be powered by a ship charging and discharging board or provided in other ways.

[0043] The AC220V working power supply of the three-phase shore power box is provided by transformer TC with a voltage ratio of 380 / 220V, which provides working power for instruments and relay protection devices.

[0044] 1TA, 2TA, 3TA are current transformers, which are configured when metering meters and relay protection devices are required. The primary current is selected according to the rated current of the shore power box, and the secondary current is selected according to the meter current.

[0045] VO is an equipotential monitoring device (using the Chinese patented product "Ship Low Voltage Shore Power System Equipotential Protection Device", patent number: 201920182300.4); the sampling points of VO are the PE of the shore power box and the N of the shore power. When the potential difference between the hull and the shore exceeds the threshold, the main circuit breaker Q will trip.

[0046] 1X is the protection and measurement signal circuit interface. The voltage signal of the metering instrument and relay protection device (for example: positive phase sequence protection, phase loss protection, overvoltage / undervoltage protection, surge protection, ground fault protection, etc. can be selected as needed) can be obtained from the protection and measurement voltage circuit of 1X, and the current signal can be obtained from the protection and measurement current circuit of 1X; if not, the protection and measurement voltage circuit should be open, and the protection and measurement current circuit should be short-circuited.

[0047] 2X is the interface of the emergency cut-off and protection tripping safety circuit. The equipotential monitoring device protection breaking contact VO and the emergency cut-off button SJ are connected in series between terminals 1 and 2 of 2X. The breaking contacts of the cable management system abnormal condition protection and other relay protection devices can be connected in series between terminals 1 and 2 of 2X. If any protection action is taken, the main circuit breaker Q will trip.

[0048] When shore power is not in use, press the button S with self-locking function to cut off the DC24V control power supply; when preparing to connect to shore power, reset the button S with self-locking function, connect the control power supply DC24V, and the undervoltage release coil of the main circuit breaker Q will be energized.

[0049] When the shore side end of the flexible cable connected to the shore power has been connected to the shore side power connection box, if the switch XK on the socket XS at the ship side end of the shore power flexible cable is in the on position, the connector XP of the shore power box incoming flexible cable is interlocked and cannot be inserted. Only when the switch XK on the socket is disconnected can the connector XP be inserted. After the connector is inserted, turn on the switch XK on the socket, and the shore power indicator H lights up (H is white or green, 220V is selected for small-capacity single-phase low-voltage shore power box, and 380V is selected for small-capacity three-phase low-voltage shore power box); at this time, the connector XP on the shore power box incoming flexible cable is held and cannot be unplugged. Only when the switch XK on the socket is disconnected can the connector XP be unplugged.

[0050] After the main circuit breaker Q is closed, the shore power is connected to supply power to the shore power switch of the ship's main switchboard; the local stop button S is pressed or the emergency stop self-locking button SJ located in other places is pressed, or any protection action in the 2X protection tripping safety circuit interface occurs, the main circuit breaker Q is undervoltage tripped; the auxiliary contacts Q3-4 and Q5-6 of the main circuit breaker Q can be used to interlock with the ship power or provide the opening / closing position signal of the main circuit breaker Q of the shore power box, which is used for related control, protection or signal circuits; the tripping signal contacts Q7-8 of the main circuit breaker Q can be used to trip with related circuit breakers.

[0051] Relay KA is a safety relay (voltage type intermediate relay). The coil of relay KA is connected in parallel with the undervoltage release coil YU through the main circuit breaker Q's active auxiliary contact Q1-2. Its voltage level is the same as the undervoltage release coil YU. The contacts of relay KA are not less than 1 normally open and 1 normally closed. When emergency cut-off or fault protection is activated, if the main circuit breaker Q protection fails to operate, relay KA provides backup protection. Its normally open contacts KA1-2 and normally closed contacts KA3-4 are used to jump the upper or lower circuit breaker and connect the alarm circuit. The safety relay can also use the coil of the current type intermediate relay in series with the undervoltage release coil YU of the main circuit breaker. When the main circuit breaker Q protection fails to operate, KA provides backup protection.

[0052] The sockets and connectors of small-capacity single-phase low-voltage shore power boxes and three-phase low-voltage shore power boxes are equipped with ground contacts PE, which are directly connected to the grounding stud PE of the box body. There is no need to install a connecting line between the hull and the shore when the ship is docked.

[0053] In the basic circuit diagram of small-capacity single-phase low-voltage shore power box and small-capacity three-phase low-voltage shore power box, there is a voltage and current circuit interface 1X for protection and measurement, and an emergency cut-off and protection tripping circuit interface 2X, which creates optional conditions for the transformation of the original shore power box, and is convenient for adding protection devices and debugging and maintenance, which is conducive to product circuit standardization.

[0054] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A small capacity low voltage shore power box circuit, characterized in that: It includes a main circuit breaker Q, a relay KA, a local stop button S, an emergency cut-off button SJ, a ship interlock switch socket, and an equipotential monitoring device VO. The ship interlock switch socket includes a switch XK, a socket XS, and a connector XP. The incoming line terminal is arranged on the incoming line side of the shore power box. The incoming line terminal of the switch XK of the ship interlock switch socket is connected to the shore power line from the port. The shore power line includes a phase line, an N line, and a PE line. The connector XP of the ship interlock switch socket leads out the phase line, the N line, and the PE line and is connected to the incoming line terminal of the main circuit breaker Q. The PE line led out by the connector XP is also connected to the ship ground PE. The outgoing line terminal of the main circuit breaker Q is connected to the shore power switch of the ship main distribution board. The undervoltage release coil YU of the main circuit breaker Q, the emergency cut-off button SJ, the local stop button S and the equipotential monitoring device VO are connected in series, and the series circuit formed by the moving breaking contacts is connected in series. The two ends of the circuit are connected to a DC24V control power supply, the series circuit formed by the series connection of the coil of relay KA and the movable auxiliary contact Q1-2 of the main circuit breaker Q is connected in parallel with the undervoltage release coil YU of the main circuit breaker Q, the normally open contacts KA1-2 of relay KA are connected in series to the tripping circuit of the upper circuit breaker, and the normally closed contacts KA3-4 of relay KA are connected in series to the alarm circuit, and the N line and PE line led out of the connector XP of the marine interlocking switch socket are respectively connected to the equipotential monitoring device VO as equipotential monitoring signals; if the switch XK on the marine interlocking switch socket is in the on position, the connector XP is interlocked and cannot be inserted. Only when the switch XK is disconnected can the connector XP be inserted. After the connector XP is inserted, the switch XK is turned on, and the connector XP is kept unable to be pulled out. Only when the switch XK is disconnected can the connector XP be pulled out.

2. A small-capacity low-voltage shore power box circuit as claimed in claim 1, characterized in that: The model of the marine interlock switch socket is CLK type.

3. A small-capacity low-voltage shore power box circuit as claimed in claim 1, characterized in that: The single-phase shore power box uses a 3-contact marine interlock switch socket in the form of 2-phase plus ground, and the three-phase shore power box uses a 5-contact marine interlock switch socket in the form of 3-phase plus neutral line plus ground.

4. A small-capacity low-voltage shore power box circuit as claimed in claim 1, characterized in that: The trip signal contact Q7-8 of the main circuit breaker Q provides a signal to the related circuit breakers for linkage tripping.

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