CN207977721U - Ship-to-shore equipotential protective device - Google Patents

Abstract

The utility model discloses a kind of ship-to-shore equipotential protective devices; including voltage monitoring relay 1KA, DC relay 2KA, DC relay 3KA, fastp-acting fuse 1F, fastp-acting fuse 2F, reset switch 1S, microswitch 2S, control power supply indicator H; equipotential automatic protection is realized between the grounded screen that the utility model can protect shell and port and pier bank electricity system earth, without changing the ground connection principle of bank side power supply system and shipboard distribution system.It is controlled using closed circuit principle, when equipotential link is not set up, realizing bank electricity connection breaker cannot be closed or be disconnected automatically in closed position, when equipotential link disconnects, energy automatic trigger emergency switching-off, after emergency switching-off occurs, without manual reset, breaker cannot be closed again.The utility model is entirely capable of meeting every latest requirement of the Classification of Vessel specification such as international standard and state's network planning model and CCS in relation to equipotential automatic protection, and cost is relatively low, securely and reliably.

Description

Ship-to-shore equipotential protective device

Technical field

The utility model is related to a kind of ship-to-shore equipotential protective devices, belong to ship electro-technical field.

Background technology

In recent years, the regulation of limitation ship exhaust gas discharge during reaching port was increasingly stringent, in the world including China Many harbour management departments are environmental protection, have required ship to stop ship generator operation during reaching port, have used bank electricity instead to ship Oceangoing ship is powered.The ship that reaches port can realize energy-saving and emission-reduction using bank electricity, promote green shipping, built consensus.

International standard IEC/ISO/IEEE 80005-1-2012《Utility connections in port-part 1: High Voltage Shore Connection(HVSC)Systems-Ggngral requirements》(public work in harbour Journey connector part 1s:High voltage shore power connection system ＜ HVSC- systems ＞-General Requirement) in 6.2.3 and 6.2.4 be all directed to and connect Ground proposes new requirement with equipotential protection, and major classification society of the world revises the related content of Classification of Vessel specification, example in succession As China Classification Society (CCS) has newly revised and enlarged a chapter content in Classification of Vessel specification《High-voltage alternating bank electricity system》(refer to CCS steel Matter seagoing vessel classification rules the 8th the 19th chapter of the 2015, the 5th fascicle, limited liability company of People's Transportation Press publish and distribute, June the 1st edition in 2015, book number：151142150), wherein there is a new safeguard protection, i.e., the equipotential between ship-to-shore is protected Shield.Related specification is defined as equipotential link：" making the electrical connection that current potential is of substantially equal between conductive component ", code requirement " equipotential link should be established between ship and harbour, and the connection should not change the ground connection principle of ship power distribution system "；Specification It is required that at " equipotential link is not set up ", " bank electricity connection breaker (being mounted in bank electricity connection power distribution cabinet) should cannot be closed Or disconnected automatically in closed position "；It is required that when " equipotential link disconnection ", " answering automatic trigger emergency switching-off ", specification is also wanted It asks " after emergency switching-off occurs, non-through manual reset, breaker cannot be closed again ".

State Grid Corporation of China attaches great importance to the construction of harbour bank electricity system, has issued Q GDW 11468-2015 in succession《Port Port electric system construction specification》With Q GDW 11468-2016《Harbour bank electricity equipment specification》, port and pier is made to configure Shore electric power covers the voltage and frequency level of existing domestic and international Ship Power Station, and use is connect when reaching port convenient for ship.Q GDW 11468.1 being provided in -2016 specifications：" earth fault should not any position of bank side to shipboard generate be more than 0.03kV across Walk voltage or contact voltage ", " high voltage shore power power supply should meet IEC/ISO/IEEE to code requirement with hull equipotential link The regulation of 6.2.4 in 80005-1-2012 ", specification also require " to configure corresponding emergent stopping in high voltage shore power mains side to return Road makes supply side and power side interlocking close ".

Currently, when ship accesses bank electricity, hand inspection shell (ship) and port and pier bank electricity system are typically relied on Whether it has been electrically connected between the grounded screen (bank E) of ground protection, has been typically using earth resistance meter test ground connection on the bank Then device evaluates whether earthed system meets the requirements to ground resistance.But to meet international standard, state's network planning model with The latest requirement that Classification of Vessel specification proposes --- it realizes equipotential automatic protection, must just develop a kind of ship-to-shore equipotential protection Device makes the equipotential automatic protection of range to be monitored have selectivity, rapidity, sensitivity and reliability, and meets specification To other related design requirements of safety system.

Utility model content

It, can be to shell (ship) and harbour code the purpose of this utility model is to provide a kind of ship-to-shore equipotential protective device Realize that equipotential protection automatically controls between the grounded screen (bank E) of head bank electricity system earth protection；The utility model is without changing The ground connection principle of bank side power supply system and shipboard distribution system is suitble to lead in the system of 50Hz or 60Hz different voltages grades With.

The purpose of this utility model is achieved by the following technical programs：

A kind of ship-to-shore equipotential protective device, including voltage monitoring relay 1KA, DC relay 2KA, DC relay 3KA, fastp-acting fuse 1F, fastp-acting fuse 2F, reset switch 1S, microswitch 2S, control power supply indicator H；The voltage One end of supervisory relay 1KA current potential sampling loops is connect with sample point bank E, the voltage monitoring relay 1KA current potentials sampling It is connect with sample point ship after a pair of of break contact of the other end series direct current relay 2KA in circuit, the fastp-acting fuse 1F, fastp-acting fuse 2F end of incoming cables access power supply, the DC relay 3KA lines from online continuous-current plant peculiar to vessel The both ends of circle are connect with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F respectively, a pair of the DC relay 3KA Moving together contact connects with control power supply indicator H, the both ends of series circuit respectively with fastp-acting fuse 1F, fastp-acting fuse 2F Leading-out terminal connects, and a pair of of moving together contact of the DC relay 2KA and a pair of of break contact of voltage monitoring relay 1KA are simultaneously Connection, one end of parallel circuit are connect with the leading-out terminal of fastp-acting fuse 2F, the other end and the DC relay 2KA lines of parallel circuit The normally closed interlock series connection of circle, reset switch 1S is followed by the leading-out terminal of fastp-acting fuse 1F, the voltage monitoring relay work electricity The positive and negative electrode input terminal in source is connect with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F respectively, the voltage monitoring relay A pair of of break contact of device 1KA is connect with ship acoustooptic alarm system driving circuit, and a pair of the DC relay 3KA is dynamic Disconnected contact is connect with ship acoustooptic alarm system driving circuit, a pair of of break contact, the direct current of the voltage monitoring relay 1KA A pair of of moving together contact parallel connection of a pair of of the break contact, DC relay 2KA of relay 3KA accesses bank side for the main open circuit of electric installation Device trip(ping) circuit, it is another pair break contact of voltage monitoring relay 1KA, another pair break contact of DC relay 3KA, micro- A pair of of break contact parallel connection access shipboard power receiving device main circuit breaker trip(ping) circuit of dynamic switch 2S, the one of the microswitch 2S To accessing shipboard power receiving device main circuit breaker closing circuit after a pair of of break contact series connection of moving together contact, DC relay 2KA.

The purpose of this utility model can also be further realized by following technical measures：

Aforementioned ship-to-shore equipotential protective device, wherein voltage monitoring relay 1KA, working power lie prostrate for DC24, overvoltage Threshold value adjustable extent is 3 volts to 30 volts, closed circuit principle control.

Aforementioned ship-to-shore equipotential protective device, according to the actual demand of not shipmate type or protected object, by electricity such as ship-to-shores The voltage monitoring relay 1KA voltage thresholds of position protective device are set between 3-30 volts.

Aforementioned ship-to-shore equipotential protective device, by the voltage monitoring relay 1KA overvoltage of ship-to-shore equipotential protective device Threshold value is set in upper limit value 50% as defined in specification hereinafter, i.e. 15 volts hereinafter, improve the safety coefficient of equipotential protection.

Aforementioned ship-to-shore equipotential protective device, by the voltage monitoring relay 1KA overvoltage of ship-to-shore equipotential protective device Threshold value is set as 14 volts.

Compared with prior art, the utility model has the beneficial effects that：The utility model can be to shell (ship) and harbour Equipotential automatic protection is realized between the grounded screen (bank E) of harbour bank electricity system earth protection, without changing bank side power supply system With the ground connection principle of shipboard distribution system.It is controlled, is not set up in equipotential link or in control circuit failure using closed circuit principle When, it can realize that bank electricity connection breaker cannot be closed or be disconnected automatically in closed position, it, can be automatic when equipotential link disconnects Emergency switching-off is triggered, after emergency switching-off occurs, without manual reset, shipboard bank electricity connects breaker and bank side is equal for electrical circuit breakers It cannot be closed again.The utility model is entirely capable of meeting the Classification of Vessel specification such as international standard and state's network planning model and CCS related Every latest requirement of equipotential automatic protection, and cost is relatively low, securely and reliably.

Description of the drawings

Fig. 1 is the ship-to-shore equipotential protective device cut-away drawing of the utility model；

Fig. 2 is the ship-to-shore equipotential automatic protection control principle drawing of the utility model；

Fig. 3 is that the protection of the utility model ship-to-shore equipotential automatically controls external cabling schematic diagram.

Specific implementation mode

The utility model is described in further detail in the following with reference to the drawings and specific embodiments.

As shown in Figure 1, being the cut-away drawing of the utility model ship-to-shore equipotential protective device.Microswitch 2S in figure, It is in international standard (IEC62613-2：2011, IEC/ISO/IEEE 80005-1-2012) coupler peculiar to vessel on configure it is micro- Dynamic switch, displacement when being coupled with input socket peculiar to vessel using connector peculiar to vessel make microswitch act, and contact is instantaneously converted, When connector peculiar to vessel is coupled with input socket peculiar to vessel disconnection, microswitch automatically resets.Each component in the utility model Series or model are alternative there are many kinds of all, and specification within the scope of the arm's length standard of electric product, is easier to select Match.Voltage monitoring relay 1KA is supervised with the voltage of the model CM-ESS series of use ABB AB in specific embodiment in Fig. 1 For relay, operating voltage DC24V, contact is 4 normally closed, and voltage threshold 3-30V is adjustable, selects closed circuit principle control；Directly Current relay 2KA coil voltages are DC24V, and contact is 2 normally opened, 2 normally closed；DC relay 3KA coil voltages are DC24V, are touched Head is 1 normally opened, 3 normally closed；Fastp-acting fuse 1F, fastp-acting fuse 2F rated voltage be 250V, fusible core 5A；Reset switch 1S For band key button switch, rated voltage 250V, pole is opened for 1,1 closes, and the rated voltage of indicator light H is DC24V.

Component can be mounted in an electric appliance box by the present apparatus, become an independent electric product；It can also incite somebody to action Component is mounted in shipboard bank electricity power receiving device, a component part as its secondary circuit.

As shown in Fig. 2, the ship-to-shore equipotential protective device of the utility model, including voltage monitoring relay 1KA, direct current after Electric appliance 2KA, DC relay 3KA, fastp-acting fuse 1F, fastp-acting fuse 2F, reset switch 1S, microswitch 2S, control electricity Source indicator light H；One end of the voltage monitoring relay 1KA current potential sampling loops is connect with bank E, the voltage monitoring relay A pair of of break contact of the other end series direct current relay 2KA of 1KA current potential sampling loops with being followed by ship, the fastp-acting fuse 1F, fastp-acting fuse 2F end of incoming cables access power supply, the DC relay 3KA coils from online continuous-current plant peculiar to vessel Both ends connect respectively with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F, a pair of the DC relay 3KA is dynamic It closes contact and connects with power supply indicator H is controlled, the both ends of series circuit go out with fastp-acting fuse 1F, fastp-acting fuse 2F respectively Line end connects, and a pair of of moving together contact of the DC relay 2KA and a pair of of break contact of voltage monitoring relay 1KA are simultaneously Connection, one end of parallel circuit are connect with the leading-out terminal of fastp-acting fuse 2F, the other end and the DC relay 2KA lines of parallel circuit The normally closed interlock series connection of circle, reset switch 1S is followed by the leading-out terminal of fastp-acting fuse 1F, the voltage monitoring relay 1KA work The positive and negative electrode input terminal of power supply is connect with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F respectively, the voltage monitoring after A pair of of break contact of electric appliance 1KA is connect with ship acoustooptic alarm system driving circuit, and a pair of the DC relay 3KA is dynamic Disconnected contact is connect with ship acoustooptic alarm system driving circuit, a pair of of break contact, the direct current of the voltage monitoring relay 1KA A pair of of moving together contact parallel connection of a pair of of the break contact, DC relay 2KA of relay 3KA accesses bank side for the main open circuit of electric installation Device trip(ping) circuit, another pair break contact of voltage monitoring relay 1KA, another pair break contact of DC relay 3KA, A pair of of break contact parallel connection of microswitch 2S accesses shipboard power receiving device main circuit breaker trip(ping) circuit, the microswitch 2S's A pair of of moving together contact, DC relay 2KA a pair of of break contact series connection after access shipboard power receiving device main circuit breaker close a floodgate back Road.

The specific requirement that control Classification of Vessel specification protects equipotential in relation to specification with Guo Wang companies, by the utility model Realize that the circuit theory that equipotential protection automatically controls is further described below:

1. the utility model designs the latest requirement that ship-to-shore equipotential is protected according in relation to specification, using closed circuit principle control System, meet International Maritime Organization (IMO) by《International Convention for the Safety of Life at Sea》(SOLAS pacts) is about " most actually Can ground designed by failure safe principle " requirement.

2. code requirement：" equipotential link should be established between ship and harbour, and the connection should not change ship power distribution system The ground connection principle of system ".It requires accordingly, ship connects during stopping port and pier with should be by shell (ship) and bank electricity when bank electricity Between the grounded screen (bank E) of system nearby, reliably it is electrically connected with qualified conductor, makes equipotential between the two.For This, IEC62613-2：2011, the international standards such as IEC/ISO/IEEE 80005-1-2012 regulation by 3 phase poles of bank electricity, 1 Earth polar is arranged with 3 control contacts in the same electric accessories, it is ensured that the integrality of bank electricity connection and safety, international standard Electric accessories in regulation HVSC systems (high voltage shore power connection system) " have 3 phase poles (L1, L2, L3), 1 earth polar (E) and most More 3 control contacts (P1, P2, P3) ", application No. is 201810045256.2 Chinese utility model patent applications《High pressure bank Electrical connection system private cable》In be designed with the control core wires of ground core wire+3 of 3 phase core wires+1, can be with the state in HVSC systems The mating connection of border standard electric accessories, i.e., in private cable 3 phase core wires and 1 ground core wire difference circuit closer attachment in L1, P1, P2, P3 in L2, L3 and E, 3 control core wire difference circuit closer attachmentes, so that it is guaranteed that Neng An is international between bank side and shipboard Standard carries out bank electricity connection.

The equipotential protection sample point of the utility model for ship with bank E, be ship directly with shell or shipboard bank electricity by Ground wire connection in electric installation, as shown in figure 3, bank E is connect in system-specific cable 1 with high voltage shore power by coupler peculiar to vessel A control line (temporarily be known as P3 lines) connection, P3 lines are supplied by the control contact (fixing tentatively as P3) in plug with bank side in bank side The grounded screen of electric installation connects.

Because being not prescribed by respective particular use to 3 control contacts in HVSC system electric accessories in relation to standard, It is possible to connect with the grounded screen of bank electricity system by the control contact P1 or P2 in plug when wiring, then ship-to-shore equipotential is protected Protecting the external cabling automatically controlled also needs to be adjusted accordingly core wire identification number according to field condition.

As shown in figure 3, bank side is by the earth polar E and private cable in plug for the grounded screen (bank E) of electric installation nearby Ground wire connection in bank side, shipboard with ship is connect by coupler peculiar to vessel by the ground wire in private cable, the utility model Only by current potential sample point with being selected as ship with bank E, the ground connection principle of opposite bank side power supply system and shipboard distribution system is impossible to Cause any change.

3. code requirement：" when to the power loss of security system and alarm system normal power supply, it should be able to be automatically to spare Power supply is converted, and should send out alarm ".Control power supply DC24V in the utility model, be connected to Chinese patent product " it is peculiar to vessel Wire type continuous-current plant " (Patent No. ZL2016213330998), the requirement that power supply is entirely capable of meeting specification are realized automatically It is converted to stand-by power supply on ground；Control power supply is monitored by DC relay 3KA in the present invention, closed circuit principle control System, when controlling power supply DC24V and powering normal, DC relay 3KA is attracted, and normally closed interlock dynamic circuit breaker, normally open contact dynamic circuit connector is connected Power supply indicator H；When controlling power circuit failure, DC relay 3KA trippings or release, normally open contact deenergization refer to Showing lamp H, a pair of of 3KA break contacts of access ship acoustooptic alarm system driving circuit, which reset, connects ship acoustooptic alarm system, Prompt is in " control power failure " state.

4. code requirement：" bank electricity system is controlled answers automatic trigger emergency switching-off with monitoring line fault " shipboard bank electricity connects Breaker.The utility model is when controlling power circuit failure, DC relay 3KA trippings or release, and each normally closed interlock resets, A pair of DC relay 3KA is incorporated to bank side and resets connection main circuit breaker for the normally closed interlock of electric installation main circuit breaker trip(ping) circuit Trip(ping) circuit makes bank side trip for electric installation main circuit breaker；It is disconnected that another pair of DC relay 3KA is incorporated to shipboard power receiving device master The normally closed interlock of road device trip(ping) circuit, which resets, connects circuit breaker trip circuit, and shipboard power receiving device main circuit breaker is made to trip.

5. code requirement：" earth fault should not be more than the electricity that strides of 0.03kV in the generation of any position of bank side to shipboard Pressure or contact voltage ".It could be theoretically argued that ship between bank E if having had qualified electrical connection, when earth fault occurs When, the step voltage of any position or contact voltage should be approximately 0 volt from bank side to shipboard, in ship electrical between bank E It connects unqualified or occurs in the case of opening a way, just will produce potential difference between bank E to ship.30 volts of voltages below are electricity Industry safety code provide under normal circumstances, the safe voltage range that human body can bear.The utility model protects equipotential Setting value is reduced to 50% or less (i.e. 15 volts or less) of the safe voltage upper limit value；Voltage monitoring relay (1KA) is produced with ABB (model CM-ESS series, working power lie prostrate for DC24, and overvoltage threshold adjustable extent is 3 volts to 30 volts, and selection is closed for product Road principle control), the overvoltage threshold of 1KA is set as 14 volts, when the voltage of potential measurement signal input point is less than setting threshold When value and DC24 volt working power normal power supplies, the output relay snap action of 1KA, normally closed interlock dynamic circuit breaker, normally open contact Dynamic circuit connector；When the voltage of potential measurement signal input point is more than given threshold or working power failure, the output relay wink of 1KA Shi Fuwei, i.e. normally open contact are disconnected, and normally closed interlock connects bank side for electric installation main circuit breaker and the main open circuit of shipboard power receiving device The trip(ping) circuit of device；Voltage threshold easily can be adjusted within the scope of 3 volts to 30 volts to 1KA according to the requirement of not shipmate type, Make protection that there is larger selectivity；To prevent when earth fault occurs, in ship higher electricity may occur between bank E Potential difference and the service life for influencing 1KA, therefore the break contact for the DC relay 2KA that contacted in the current potential sampling loop of 1KA, When 1KA resets the wire loop for connecting 2KA, 2KA is attracted and self-sustaining, and the current potential that the break contact of 2KA has cut off 1KA takes Sample circuit, it is of short duration work to make 1KA, it is ensured that its influence from overvoltage.

6. code requirement：When " equipotential link is not set up ", " bank electricity connects breaker and (is mounted on bank electricity and connects power distribution cabinet It is interior) should cannot be closed or be disconnected automatically in closed position ", it also requires " to configure in high voltage shore power mains side and promptly stop accordingly Non-return road makes supply side and power side interlocking close "；The microswitch configured on international norm coupler peculiar to vessel, i.e. this reality With the microswitch 2S in novel Fig. 1, Fig. 2, after connector peculiar to vessel couples completely with input socket peculiar to vessel, in connector peculiar to vessel Bank E connected with the ship in input socket peculiar to vessel, indicate equipotential link oneself establish, displacement when plugging together of connector peculiar to vessel Microswitch 2S is set to act, contact is instantaneously converted；Conversely, showing that equipotential link is not set up, microswitch 2S contacts are multiple Position.Fig. 2 is by the break contact series connection of the moving together contact of microswitch 2S and 2KA in shipboard bank electricity power receiving device main circuit breaker In closing circuit, when ensuring that equipotential link is not set up or after 2KA actions, the main circuit breaker of shipboard bank electricity power receiving device can not It closes a floodgate；If shipboard power receiving device and bank side are closed for the main circuit breaker of electric installation, when equipotential monitoring signal is more than 1KA When given threshold, 1KA is resetted to be acted with 2KA, and the break contact of 1KA resets the normally open contact dynamic circuit connector connected with 2KA, is also turned on For the trip(ping) circuit of electric installation main circuit breaker, another break contact of 1KA, which resets, connects shipboard power receiving device main circuit breaker for bank side Trip(ping) circuit, so that bank side is disconnected for the main circuit breaker of electric installation and shipboard power receiving device is automatic simultaneously.

7. code requirement：When " equipotential link disconnection ", " answering automatic trigger emergency switching-off " shipboard bank electricity connects breaker. When connector peculiar to vessel and the input socket peculiar to vessel in ship electric coupler disconnect (indicate the bank E of connector peculiar to vessel with ship it Between equipotential link disconnect), microswitch 2S resets, and the bank electricity that normally closed interlock connects shipboard power receiving device connects breaker Trip(ping) circuit.

8. specification provides：" after emergency switching-off occurs, non-through manual reset, breaker is or not shipboard power receiving device main circuit breaker It can be closed again ".The utility model is equipped with reset switch 1S in 2KA wire loops, and after 1KA protection acts, 2KA is attracted certainly It protects, break contact is disconnected shipboard power receiving device main circuit breaker closing circuit, and moving together contact has connected bank side for electric installation Main circuit breaker trip(ping) circuit, it is necessary to which artificial shutdown reset switch 1S makes 2KA reset, is likely to be again switched on shipboard power receiving device With bank side for the main circuit breaker closing circuit of electric installation, otherwise can not be closed again.

9. the utility model can be not only used for the equipotential automatic protection between ship-to-shore, present apparatus back panel wiring is without changing Dynamic, Automatic Control Theory is without changing, as long as changing the current potential sample point of protective device, according to different protection domains, modification The voltage threshold of setting and controlled breaker, the present apparatus and Automatic Control Theory can be used for factory, workshop, building The equal electrical equipments such as buildings or generating set, box-type substation carry out equipotential automatic protection.

In addition to the implementation, the utility model can also have other embodiment, all to use equivalent replacement or equivalent change The technical solution to be formed is changed, is all fallen in the protection domain of the requires of the utility model.

Claims (5)

1. a kind of ship-to-shore equipotential protective device, which is characterized in that including voltage monitoring relay 1KA, DC relay 2KA, DC relay 3KA, fastp-acting fuse 1F, fastp-acting fuse 2F, reset switch 1S, microswitch 2S, control power supply indicator H；One end of the voltage monitoring relay 1KA current potential sampling loops is connect with sample point bank E, the voltage monitoring relay It is connect with sample point ship after a pair of of break contact of the other end series direct current relay 2KA of 1KA current potential sampling loops, it is described Fastp-acting fuse 1F, fastp-acting fuse 2F end of incoming cables access power supply from online continuous-current plant peculiar to vessel, the direct current after The both ends of electric appliance 3KA coils are connect with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F respectively, the DC relay A pair of of moving together contact of 3KA connect with control power supply indicator H, the both ends of series circuit respectively with fastp-acting fuse 1F, quick The leading-out terminal of fuse 2F connects, a pair of a pair of of the moving together contact and voltage monitoring relay 1KA of the DC relay 2KA Break contact is in parallel, and one end of parallel circuit is connect with the leading-out terminal of fastp-acting fuse 2F, the other end and direct current of parallel circuit The normally closed interlock series connection of relay 2KA coils, reset switch 1S is followed by the leading-out terminal of fastp-acting fuse 1F, the voltage monitoring after The positive and negative electrode input terminal of electrical work power supply is connect with the leading-out terminal of fastp-acting fuse 1F, fastp-acting fuse 2F respectively, the electricity A pair of of break contact of pressure supervisory relay 1KA is connect with ship acoustooptic alarm system driving circuit, the DC relay 3KA A pair of of break contact connect with ship acoustooptic alarm system driving circuit, a pair of of dynamic circuit breaker of the voltage monitoring relay 1KA A pair of of moving together contact parallel connection access bank side power supply of contact, a pair of of break contact of DC relay 3KA, DC relay 2KA Device main circuit breaker trip(ping) circuit, another pair break contact of voltage monitoring relay 1KA, another pair of DC relay 3KA A pair of of break contact parallel connection of break contact, microswitch 2S accesses shipboard power receiving device main circuit breaker trip(ping) circuit, described micro- Access shipboard power receiving device master is disconnected after a pair of of moving together contact of dynamic switch 2S, a pair of of break contact series connection of DC relay 2KA Road device closing circuit.

2. ship-to-shore equipotential protective device as described in claim 1, which is characterized in that the voltage monitoring relay 1KA, work Make power supply to lie prostrate for DC24, overvoltage threshold adjustable extent is 3 volts to 30 volts, closed circuit principle control.

3. ship-to-shore equipotential protective device as claimed in claim 2, which is characterized in that according to not shipmate type or protected object Actual demand, by the voltage monitoring relay 1KA voltage thresholds of ship-to-shore equipotential protective device 3-30 volt between set It is fixed.

4. ship-to-shore equipotential protective device as claimed in claim 3, which is characterized in that by the electricity of ship-to-shore equipotential protective device Pressure supervisory relay 1KA overvoltage thresholds are set in upper limit value 50% as defined in specification hereinafter, i.e. 15 volts hereinafter, improve equipotential The safety coefficient of protection.

5. ship-to-shore equipotential protective device as claimed in claim 4, which is characterized in that by the electricity of ship-to-shore equipotential protective device Pressure supervisory relay 1KA overvoltage thresholds are set as 14 volts.