CN208190233U - Landing stage three-phase four-wire system power distribution system secure protective device - Google Patents

Landing stage three-phase four-wire system power distribution system secure protective device Download PDF

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Publication number
CN208190233U
CN208190233U CN201820637920.8U CN201820637920U CN208190233U CN 208190233 U CN208190233 U CN 208190233U CN 201820637920 U CN201820637920 U CN 201820637920U CN 208190233 U CN208190233 U CN 208190233U
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phase
low
voltage
wire
relay
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谢颖
夏进
刘磊
周洋
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JIANGSU ZHENJIANG SHIPYARD (GROUP) CO Ltd
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JIANGSU ZHENJIANG SHIPYARD (GROUP) CO Ltd
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Abstract

The utility model discloses a kind of landing stage three-phase four-wire system power distribution system secure protective devices, including low-voltage circuit breaker QF, low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F, voltage relay 1KA, voltage relay 2KA, intermediate relay 3KA, button S, diode 1VD, Zener 2VD, the utility model carries out automatic protection to the safe operation of landing stage three-phase four-wire system distribution system, once there is the zero curve electrical connection failure of bank side or shipboard, the electrical connection on hull and bank ground is failed, hull and bank ground potential differ, zero pole contact of breaker is bad, phase shortage occurs for any phase of power supply three-phase, the situations such as open circuit and low voltage electric network earthing or grounding means failure on the bank occur for any place of zero curve, shore electric power can instantaneously be automatically cut off to protect equipment and personal safety.

Description

Landing stage three-phase four-wire system power distribution system secure protective device
Technical field
The utility model relates to a kind of landing stage three-phase four-wire system distribution systems more particularly to a kind of landing stage three-phase and four-line to prepare Electrical system safety protective device belongs to Electrical system for a ship technical field.
Background technique
Landing stage is that anchoring is fixed on bank, as handling goods or for the floating wharf above and below personnel, there are many place incited somebody to action The purposes on landing stage expand as food and drink amusement etc. places, landing stage be to be transformed with huge obsolete vessel, such as same seat set in water Skyscraper, but it does not have the natural conditions of onshore constructions earthing or grounding means.In recent years to the new rule of environmental protection It is fixed constantly to put into effect, it is desirable that self power generation should to be stopped when ship landing pier, to reduce exhaust emission.On August 4th, 2017, traffic fortune Defeated portion's publication " about the instruction for promoting Yangtze River Zone green shipping development ", proposes " to widely popularize ship use of reaching port Bank electricity ", landing stage are even more to stand in the breach, and need all to be changed to connect and use bank electricity as main power source.
The electricity system of China's low voltage electric network is the AC three-phase four-wire system distribution system of neutral ground, and rated frequency is 50Hz, voltage rating 400V/230V.In " steel inland navigation craft builds specification " (2016 of China Classification Society (CCS) publication Version) in the 3rd the 16th chapter " additional requirement on landing stage ", it is specified that by bank electricity power supply " landing stage distribution system should be with bank electricity power distribution system It is unified to cause ", it is desirable that " landing stage should be equipped with the measure that hull is carried out to reliable electric connection with earthing or grounding means on the bank " also requires wholesale Ship " when by four line neutral earthing system power supply of AC three-phase on the bank, should be equipped with hull and bank electricity zero curve carrying out reliable electric company The measure connect." requirement that meets ship specification this two " reliable electric connection " conscientiously, to landing stage three-phase four-wire system distribution system Safe operation it is particularly significant.
The power receiving device that ship specification provides that ship is used as connection bank electricity is shore connection box.Existing CB373-85 standard " bank electricity Case " the 1.4th article of regulation " main switch of shore connection box uses plastic shell air-break circuit-breaker, should all equipped with overload and short-circuit protection, Needed that o-volt protection and phase-sequence changed device can be added according to user ", the 2.14th article of regulation " should connect on bank electricity cabinet equipped with safety Ground stud ", " the shore connection cable binding post of three-phase shore connection box should have midpoint zero curve binding post." visible shore connection box as shipboard by Electric installation, while shore connection box to the connecting cable between main distribution board is protected, but does not have to three-phase four-wire system on ship Power distribution system secure runs the function of being protected.For a long time, above-mentioned two " reliable electric connections " that ship specification requires It is whether qualified, it is all to draw a conclusion after carrying out observation inspection by people, the safe operation to landing stage three-phase four-wire system distribution system lacks It is few continuously to monitor and be effectively protected method.
AC three-phase 380V load on landing stage is powered by three-phase line voltage (U-V-W phase), AC single phase 220V load It is to be powered by phase voltage (U-E or V-E or W-E), it can not be to above-mentioned two required by ship specification using artificial method " reliable electric connection " carries out every minute and second and ceaselessly observes inspection, open circuit of connection line or hull and the bank electricity zero curve on hull and bank ground The failures such as open circuit of connection line happen occasionally, and gently then burn out equipment, heavy then jeopardize personal safety.Such as three characteristics of the middle term four-wire system power distribution system Line over-voltage caused by system zero-line open-circuit, the accident for burning out the single-phase loads such as the electric appliance used online cause equipment to lose. Therefore, a kind of landing stage three-phase four-wire system power distribution system secure protective device is developed, to the peace of landing stage three-phase four-wire system distribution system Row for the national games carries out automatic protection, once there are the failures such as above-mentioned " reliable electric connection " failure, can instantaneously automatically cut off bank electricity electricity Source is had a very important significance with protecting equipment and personal safety.
Utility model content
The purpose of this utility model is to provide a kind of landing stage three-phase four-wire system power distribution system secure protective devices, to landing stage The safe operation of three-phase four-wire system distribution system carries out automatic protection, once the zero curve electrical connection for bank side or shipboard occur is lost Effect, electrical connection failure, hull and the bank ground potential on hull and bank ground are not etc., zero pole contact of breaker is bad, power supply three The situations such as phase shortage, any place generation open circuit of zero curve and low voltage electric network earthing or grounding means failure on the bank occur for mutually any phase, Shore electric power can instantaneously be automatically cut off to protect equipment and personal safety.
The purpose of this utility model is achieved by the following technical programs:
A kind of landing stage three-phase four-wire system power distribution system secure protective device, including low-voltage circuit breaker QF, low-tension fuse 1F, Low-tension fuse 2F, low-tension fuse 3F, voltage relay 1KA, voltage relay 2KA, intermediate relay 3KA, button S, two Pole pipe 1VD, Zener 2VD, the low-voltage circuit breaker QF are quadrupole linkage point/mould assembly, and low-voltage circuit breaker QF tri- mutually great standby The overload and short-circuit protection function of compound or electronics tripping mode, zero extremely upper unprotect, low-voltage circuit breaker QF are de- configured with decompression Detain device TQ;Three-phase four-wire system bank electricity is connected to the end of incoming cables low-voltage circuit breaker QF, three phases of three-phase four-wire system bank electricity by shore connection cable Line is connect with the phase pole end of incoming cables A, B, C of low-voltage circuit breaker QF respectively, midpoint zero curve and the low pressure open circuit of three-phase four-wire system bank electricity The zero pole end of incoming cables N of device QF connects, and bank electricity is connected on the main distribution board of landing stage from low-voltage circuit breaker QF leading-out terminal with cable for ship Main power source circuit breaker Q end of incoming cables, the zero curve busbar connector ground connection on the main distribution board of landing stage;The low-tension fuse 1F, button S Normally-closed contact, the normally opened contact of voltage relay 1KA, the normally opened contact of voltage relay 2KA, intermediate relay 3KA it is normal Closed contact is connected in series, the A phase of a termination three-phase four-wire system bank electricity of series circuit, another termination no-voltage trip of series circuit One end of the coil of device TQ, the anode of another terminating diode 1VD of the coil of no-voltage release TQ, the cathode of diode 1VD The cathode of Zener 2VD is connect, the anode of Zener 2VD connects one end of the coil of intermediate relay 3KA, intermediate relay 3KA's The leading-out terminal of the zero pole N of another termination low-voltage circuit breaker QF of coil, the normally opened contact both ends of the intermediate relay 3KA are informed of a case Alert circuit, the B phase of a termination three-phase four-wire system bank electricity of the low-tension fuse 2F, the other end series electrical of low-tension fuse 2F The coil of potential relay 1KA is followed by the A phase of three-phase four-wire system bank electricity, a termination three-phase four-wire system bank of the low-tension fuse 3F The C phase of electricity, the coil of the other end series voltage relay 2KA of low-tension fuse 3F are followed by the A phase of three-phase four-wire system bank electricity.
The purpose of this utility model can also be further realized by following technical measures:
Aforementioned landing stage three-phase four-wire system power distribution system secure protective device, further includes indicator light H, and the one of the indicator light H It is terminated between low-tension fuse 2F and voltage relay 1KA coil, the another of indicator light H is terminated at low-tension fuse 3F and electricity Between potential relay 2KA coil.
Aforementioned landing stage three-phase four-wire system power distribution system secure protective device, further includes detection device for phase sequence P, the phase sequence inspection Survey the leading-out terminal that device P is connected to low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F.
Aforementioned landing stage three-phase four-wire system power distribution system secure protective device further includes phase-sequence changed device PA, the phase sequence Conversion equipment PA is connected to the leading-out terminal of low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F.
Aforementioned landing stage three-phase four-wire system power distribution system secure protective device, the burning voltage of Zener 2VD are selected as 6V, intermediate The voltage rating of relay 3KA is selected as DC6V.
Compared with prior art, the utility model has the beneficial effects that the safety of landing stage three-phase four-wire system distribution system Operation carries out automatic protection, once the electrical connection for zero curve electrical connection failure, hull and the bank ground of bank side or shipboard occur is lost Effect, hull and bank ground potential are not etc., zero pole contact of breaker is bad, phase shortage occurs for any phase of power supply three-phase, zero curve is appointed The situations such as open circuit and low voltage electric network earthing or grounding means failure on the bank occur at one, can instantaneously automatically cut off shore electric power to protect Protect equipment and personal safety.Present apparatus circuit structure is simple, and the component of use is less and is easily configured, to old landing stage shore connection box Or main distribution board carries out technological transformation, the installation of new landing stage and repairs in the future all easily, safety protection range is extensive.
Detailed description of the invention
Fig. 1 is the electrical schematic diagram of the utility model;
Fig. 2 is landing stage three-phase four-wire system main distribution board primary system schematic diagram;
Fig. 3 is the circuit diagram that the utility model is applied to landing stage main distribution board.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, the landing stage three-phase four-wire system power distribution system secure protective device of the utility model, including low pressure open circuit Device QF, low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F, voltage relay 1KA, voltage relay 2KA, centre Relay 3KA, button S, diode 1VD, Zener 2VD, indicator light H, the low-voltage circuit breaker QF are quadrupole linkage point/conjunction Type, the overloads and short-circuit protection function of low-voltage circuit breaker QF tri- mutually great standby compound or electronics tripping modes, zero extremely on without guarantor Shield, low-voltage circuit breaker QF are configured with no-voltage release TQ;Shore connection cable by three-phase four-wire system bank electricity be connected to low-voltage circuit breaker QF into Line end, three phase lines of three-phase four-wire system bank electricity are connect with the phase pole end of incoming cables A, B, C of low-voltage circuit breaker QF respectively, three-phase and four-line The midpoint zero curve of bank electricity processed is connect with the zero pole end of incoming cables N of low-voltage circuit breaker QF, with cable for ship from low-voltage circuit breaker QF outlet Hold the end of incoming cables for main power source circuit breaker Q bank electricity being connected on the main distribution board of landing stage, the zero curve busbar connector on the main distribution board of landing stage Ground connection;The low-tension fuse 1F, the normally-closed contact of button S, the normally opened contact of voltage relay 1KA, voltage relay 2KA The normally-closed contact series connection of normally opened contact, intermediate relay 3KA, the A phase of a termination three-phase four-wire system bank electricity of series circuit, One end of the coil of another termination no-voltage release TQ of series circuit, another terminating diode of the coil of no-voltage release TQ The anode of 1VD, the cathode of diode 1VD connect the cathode of Zener 2VD, and the anode of Zener 2VD connects the line of intermediate relay 3KA One end of circle, the leading-out terminal of the zero pole N of another termination low-voltage circuit breaker QF of the coil of intermediate relay 3KA, the centre after The normally opened contact both ends circuit taking alarm of electric appliance 3KA, the B phase of a termination three-phase four-wire system bank electricity of the low-tension fuse 2F, The coil of the other end series voltage relay 1KA of low-tension fuse 2F is followed by the A phase of three-phase four-wire system bank electricity, and the low pressure is molten The C phase of a termination three-phase four-wire system bank electricity of disconnected device 3F, the coil of the other end series voltage relay 2KA of low-tension fuse 3F It is followed by the A phase of three-phase four-wire system bank electricity, an end of the indicator light H is connected to low-tension fuse 2F and voltage relay 1KA coil Between, the another of indicator light H is terminated between low-tension fuse 3F and voltage relay 2KA coil.P in Fig. 1 is phase sequence inspection Device (or using conversion equipment PA) is surveyed, is the additional selectable options that CB373 standard proposes, the detection device for phase sequence P is connected to low Press the leading-out terminal of fuse 1F, low-tension fuse 2F, low-tension fuse 3F.If shore connection box adds the device, to the utility model Principle have no effect with circuit structure.
In the specific implementation, the specification type selecting of each electrical component is as shown in the table:
Code name Title Specification Remarks
QF Low-voltage circuit breaker Quadrupole linkage, rated operational voltage 400V, 50Hz Electric current is matched on demand
1-3F Low-tension fuse Voltage rating 500V, rated current 10A Fusible core 6A
1-2KA Voltage relay It is coil Ue=AC380V, 1 normally opened 1 normally closed Under-voltage adjusting ≮ 0.65Ue
3KA Intermediate relay It is coil Ue=DC6V, 1 normally opened 1 normally closed Coil resistance >=50 Ω
S Button It is 250V, 5A, 1 normally opened 1 normally closed Button is used for breaker open operation
H Indicator light AC380V、≤1W Shore electric power instruction
1VD Diode Voltage rating 500V, rated current 1A
2VD Zener Burning voltage 6V, stabling current >=0.4A Dynamic electric resistor ≯ 4 Ω
P Phase-sequence detector Or phase-sequence changed device Additional selectable unit
Shore connection box low-voltage circuit breaker QF in dotted line frame as shown in Figure 1 selects quadrupole (i.e. three phase pole A, B, C and one A zero pole N of midpoint) linkage point/mould assembly, low-voltage circuit breaker QF from three phases extremely on have compound or electronics and thread off mode Overload and short-circuit protection function, zero extremely upper unprotect, the coil rating voltage of additional no-voltage release TQ are chosen to be AC220V, and Power supply is supplied by phase voltage A-N, overload, short circuit, o-volt protection are acted in low-voltage circuit breaker QF automatic brake separating.By shore connection cable Three-phase four-wire system bank electricity is connected to the end of incoming cables low-voltage circuit breaker QF of shore connection box, three phase lines are connect with its phase pole A, B, C respectively, Midpoint zero curve is connect with its zero pole N.As shown in Fig. 2, with cable for ship from the low-voltage circuit breaker QF leading-out terminal of shore connection box by bank electricity Be connected to the main power source circuit breaker Q end of incoming cables on the main distribution board of landing stage, U, V, W, E of three-phase and four-line respectively with main power source circuit breaker Q U, V, W, E of end of incoming cables are connected, by ship specification requirement " when by four line neutral earthing system power supply of AC three-phase on the bank, distribution The zero curve busbar connector sectional area of plate should be not less than the half of phase cross-sectional area, and answer reliable ground (connecing hull) ".
When low-voltage circuit breaker QF does not close a floodgate, either any position occurs wharf boat body and connect mistake with earthing or grounding means on the bank Effect or wharf boat body and bank electricity zero curve Joint failure, the busbar connector E earthing failure including main distribution board may cause Hull and bank ground potential differ, if DC voltage of the voltage of potential difference generation after diode 1VD rectification is greater than Zener 2VD Burning voltage, Zener breakdown effect are attracted intermediate relay 3KA, are connected on the no-voltage release TQ's of low-voltage circuit breaker QF The normally open contact dynamic circuit connector of normally closed interlock dynamic circuit breaker in circuit, intermediate relay 3KA connects alarm circuit, and low-voltage circuit breaker QF can not It closes a floodgate.
Any phase phase shortage in three-phase four-wire system power supply at least causes voltage relay 1KA, 2KA, low-voltage circuit breaker QF decompression There is a power loss in buckle releaser TQ coil, low-voltage circuit breaker QF can not close a floodgate.
Neutral line break in three-phase four-wire system power supply, causes low-voltage circuit breaker QF no-voltage release TQ coil losing electricity, and low pressure is disconnected Road device QF can not close a floodgate.
When three-phase four-wire system power status is normal, power supply indicator H is bright, and voltage relay 1KA, 2KA obtain electric actuation, if ship Advise desired " reliable electric connection " effectively, with bank equipotential, intermediate relay 3KA attonity power supply, low pressure are breaking for hull Device QF can close a floodgate to power to landing stage main distribution board.
Low-voltage circuit breaker QF, if any phase phase shortage occurs for three-phase four-wire system shore electric power, will make electricity in "on" position At least one power loss in potential relay 1KA, 2KA and low-voltage circuit breaker QF coil without tension, low-voltage circuit breaker QF no-voltage trip Automatic brake separating.
Low-voltage circuit breaker QF is in "on" position, if the neutral line break of three-phase four-wire system shore electric power, makes low-voltage circuit breaker QF no-voltage trip coil power loss, low-voltage circuit breaker QF no-voltage trip automatic brake separating.
Low-voltage circuit breaker QF is in "on" position, by split key S, low-voltage circuit breaker QF separating brake.
It is computed, the burning voltage of Zener 2VD is selected as 6V, and (product allows practical stability voltage value to slightly have deviation, about Voltage rating for 5.5-6.5V), intermediate relay 3KA is chosen to be DC6V, as voltage >=16V of the unequal generation of current potential, After 1VD is rectified >=DC7V, Zener 2VD Zener breakdown can be made, it is ensured that intermediate relay 3KA action message is in low-voltage circuit breaker QF threads off or is allowed to not close a floodgate, and connects alarm circuit.
The safeguard protection principle of the landing stage three-phase four-wire system distribution system of the utility model, is not limited to by the low of shore connection box Voltage breaker QF carries out safeguard protection, and safeguard protection, protection can also be carried out by the main power source circuit breaker Q on the main distribution board of landing stage Principle is constant, as shown in Figure 3.Main power source circuit breaker Q in Fig. 3 is the main power source breaker on the main distribution board of landing stage, specified Electric current can need to match according to load current, and main power source circuit breaker Q should select quadrupole (i.e. in three phase pole A, B, C and one Zero pole N of point) linkage point/mould assembly, main power source circuit breaker Q from three phases extremely on have compound or electronics and thread off the mistake of mode It carries, short circuit and have under-voltage protection function (overload, short circuit current setting valve should be less than shore connection box main circuit breaker QF), zero extremely upper nothing Protection, the coil rating voltage of device for under-voltage releasing equipment is chosen to be AC220V, and supplies power supply by phase voltage A-N, overloads, is short-circuit, deficient Pressure protection movement is in main power source circuit breaker Q automatic brake separating.
The landing stage three-phase four-wire system power distribution system secure protective device of the utility model achieves compared with the prior art Below the utility model has the advantages that
Shore connection box main switch select quadrupole linkage close/point breaker, " midpoint zero curve wiring is replaced with zero pole of breaker Column ", the current potential between monitoring hull and bank ground provide sampled point;Or it is selected with the main power switch on the main distribution board of landing stage Quadrupole linkage close/point breaker, for monitoring hull and bank ground between current potential sampled point is provided.Using 2 voltage relays It is powered respectively by source side line voltage A-B phase, A-C phase, the setting of breaker no-voltage release is powered by phase voltage A-N, accomplishes bank In power supply phase line when any phase phase shortage, main circuit breaker automatic brake separating can protected;Breaker no-voltage release is set as AC220V, and be set as being powered by source side phase voltage A-N, when the zero-line open-circuit of source side, main disconnected device automatic brake separating can be made Protection;Cooperated using 2 voltage relays and breaker no-voltage release, when shore electric power phase shortage or zero-line open-circuit occurs, Ensure that main circuit breaker can not close a floodgate;Hull and the alternating voltage of the not equal generations of bank ground potential are become by direct current using diode 1VD Voltage provides power supply to Zener 2VD, when voltage is greater than Zener stable voltage, ensures shore connection box master using zener effect Breaker can not close a floodgate;Zener tube steady voltage is chosen to be 6V, the unified specification of intermediate relay voltage rating can be met, It is to be affected by temperature minimum when burning voltage is 6V because of Zener, while generating with bank earth potential difference with capable of accomplishing ship again Voltage (is less than highest limit value 30V as defined in state's network planning model (Q GDW 11468.1-2016)) in 16V, it is ensured that shore connection box master Breaker can not close a floodgate to realize protection.
In addition to the implementation, the utility model can also have other embodiments, all to use equivalent replacement or equivalent change The technical solution to be formed is changed, is all fallen in the protection scope of the requires of the utility model.

Claims (5)

1. a kind of landing stage three-phase four-wire system power distribution system secure protective device, which is characterized in that including low-voltage circuit breaker QF, low pressure Fuse 1F, low-tension fuse 2F, low-tension fuse 3F, voltage relay 1KA, voltage relay 2KA, intermediate relay 3KA, Button S, diode 1VD, Zener 2VD, the low-voltage circuit breaker QF link for quadrupole divides/mould assembly, and low-voltage circuit breaker QF tri- The overload and short-circuit protection function of mutually great standby compound or electronics tripping mode, zero extremely upper unprotect, low-voltage circuit breaker QF configuration There is no-voltage release TQ;Three-phase four-wire system bank electricity is connected to the end of incoming cables low-voltage circuit breaker QF, three-phase four-wire system bank electricity by shore connection cable Three phase lines connect respectively with the phase pole end of incoming cables A, B, C of low-voltage circuit breaker QF, the midpoint zero curve of three-phase four-wire system bank electricity with The zero pole end of incoming cables N of low-voltage circuit breaker QF connects, and bank electricity is connected to landing stage master from low-voltage circuit breaker QF leading-out terminal with cable for ship The end of incoming cables of main power source circuit breaker Q on panel, the zero curve busbar connector ground connection on the main distribution board of landing stage;The low-tension fuse 1F, the normally-closed contact of button S, the normally opened contact of voltage relay 1KA, the normally opened contact of voltage relay 2KA, intermediate relay The normally-closed contact of 3KA is connected in series, the A phase of a termination three-phase four-wire system bank electricity of series circuit, another termination of series circuit One end of the coil of no-voltage release TQ, the anode of another terminating diode 1VD of the coil of no-voltage release TQ, diode The cathode of 1VD connects the cathode of Zener 2VD, and the anode of Zener 2VD connects one end of the coil of intermediate relay 3KA, it is intermediate after The leading-out terminal of the zero pole N of another termination low-voltage circuit breaker QF of the coil of electric appliance 3KA, the normally opened touching of the intermediate relay 3KA Point both ends circuit taking alarm, the B phase of a termination three-phase four-wire system bank electricity of the low-tension fuse 2F, low-tension fuse 2F's is another The coil of one end series voltage relay 1KA is followed by the A phase of three-phase four-wire system bank electricity, a termination three of the low-tension fuse 3F The coil of the C phase of phase four-wire system bank electricity, the other end series voltage relay 2KA of low-tension fuse 3F is followed by three-phase four-wire system bank The A phase of electricity.
2. three-phase four-wire system power distribution system secure protective device in landing stage as described in claim 1, which is characterized in that further include referring to Show lamp H, an end of the indicator light H is connected between low-tension fuse 2F and voltage relay 1KA coil, and indicator light H's is another It is terminated between low-tension fuse 3F and voltage relay 2KA coil.
3. three-phase four-wire system power distribution system secure protective device in landing stage as described in claim 1, which is characterized in that further include phase Sequence detection apparatus P, the detection device for phase sequence P are connected to the outlet of low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F End.
4. three-phase four-wire system power distribution system secure protective device in landing stage as described in claim 1, which is characterized in that further include phase Sequence conversion equipment PA, the phase-sequence changed device PA are connected to low-tension fuse 1F, low-tension fuse 2F, low-tension fuse 3F and go out Line end.
5. three-phase four-wire system power distribution system secure protective device in landing stage as described in claim 1, which is characterized in that the Zener The burning voltage of pipe 2VD is selected as 6V, and the voltage rating of intermediate relay 3KA is selected as DC6V.
CN201820637920.8U 2018-05-02 2018-05-02 Landing stage three-phase four-wire system power distribution system secure protective device Active CN208190233U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110752576A (en) * 2019-09-17 2020-02-04 国电南瑞科技股份有限公司 Ship-shore connection method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110752576A (en) * 2019-09-17 2020-02-04 国电南瑞科技股份有限公司 Ship-shore connection method and system

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