CN109921394A - A kind of shipboard automation device with failure removal function - Google Patents
A kind of shipboard automation device with failure removal function Download PDFInfo
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- CN109921394A CN109921394A CN201910298806.6A CN201910298806A CN109921394A CN 109921394 A CN109921394 A CN 109921394A CN 201910298806 A CN201910298806 A CN 201910298806A CN 109921394 A CN109921394 A CN 109921394A
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Abstract
The present invention discloses a kind of shipboard automation device with failure removal function, and REgulatable reactor is connected between three-phase line neutral point and ground wire；Acquisition unit is connected on each phase line, for acquire electric signal on the line；Contactor, for contact series on the three-phase line between the output end and ground wire of breaker, the contact is in normally open；And protection circuit; its input terminal is connect with the output end of the acquisition unit; the output end of the protection circuit is connect with the switch of the accessory power supply of the contactor coil; the switch of the accessory power supply is in normally open; when singlephase earth fault occurs for the three-phase line, the protection circuit is triggered, and controls closing the switch for the accessory power supply; so that the contact closure, while the breaker is triggered disconnection.The technical issues of present invention solves ship electricity consumption failure removal not in time.
Description
Technical field
The present invention relates to marine electrical equipment technical fields, and in particular to a kind of shipboard automation dress with failure removal function
It sets.
Background technique
Ship ac power supply system generallys use three-phase three-line system, requires height for electrical stability and continuity,
To guarantee the reliability powered to ship, but ship ac power supply system complexity is high, and marine power generation system is also different, leads
It causes ship ac power supply system to break down, influences normal operation and the power supply to ship.
Wherein, singlephase earth fault is the most common failure of distribution system, after singlephase earth fault occurs, it may occur however that
Having a rest property arc grounding causes resonance overvoltage, generates the overvoltage times over normal voltage, and overvoltage will further make on route
Insulator dielectric breakdown, cause serious short circuit accident, while part distribution transformer may be burnt, make lightning-arrest on route
Device, is burnt at fuse insulating breakdown, it is also possible to electrical fire occur, influence to cause a hidden trouble to the safe operation of ship.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
The object of the present invention is to provide a kind of shipboard automation devices with failure removal function, are connect by being used cooperatively
Tentaculum and protection circuit are generated reversed after ground fault occurs by the REgulatable reactor being connected between neutral point and ground
Big voltage, quickly triggers breaker actuation, shortens the reaction time of breaker, in time cuts off faulty line, avoids further
The safety of line facility is influenced, while when high current generates, action signal is generated by protection circuit, triggering contactor is dynamic
Make, high current is directly grounded, further protect line facility, the present invention solves ship electricity consumption failure removal not in time
Technical problem.
In order to realize these purposes according to the present invention and other advantages, a kind of ship with failure removal function is provided
Oceangoing ship automation equipment, comprising:
REgulatable reactor is connected between three-phase line neutral point and ground wire；
Acquisition unit is connected on each phase line, for acquire electric signal on the line；
Contactor, for contact series on the three-phase line between the output end and ground wire of breaker, the contact is in normal
Open state；And
Circuit is protected, input terminal is connect with the output end of the acquisition unit, and the output end of the protection circuit connects with described
The switch of the accessory power supply of tentaculum coil connects, and the switch of the accessory power supply is in normally open, when the three-phase line is sent out
When raw singlephase earth fault, the protection circuit is triggered, and closing the switch for the accessory power supply is controlled, so that the contact is closed
It closes, while the breaker is triggered disconnection.
Preferably, an acquisition unit, the electric signal of each acquisition unit acquisition are respectively set on every phase line
It is connected to the input terminal of the protection circuit altogether after AC/DC is converted.
Preferably, the coil of the contactor is connected with the accessory power supply, accessory power supply switch, and the accessory power supply is opened
Guan Weiyi controllable switch, the control terminal of the accessory power supply switch are connect with the output end of the protection circuit.
Preferably, the protection circuit includes:
Circuit occurs for differential pressure, and input terminal connect with the output end of the acquisition unit, and the differential pressure generation circuit passes through one the
One switching tube ground connection；
Second switch, input terminal connect a power end Vcc, and the output end ground connection of the second switch, described second opens
The control terminal for closing pipe is connect with the output end that circuit occurs for the differential pressure；
Comparing unit, non-inverting input terminal are connect with the output end that circuit occurs for the differential pressure, and the reverse phase of the comparing unit is defeated
Enter the input terminal that end is connected to the second switch by a benchmark generating unit；And
Signal enhancement unit, input terminal are connect with the control terminal of the output end of the comparing unit, first switch tube simultaneously, institute
The output end for stating signal enhancement unit is connected to the control terminal of the accessory power supply switch.
Preferably, the differential pressure generation circuit includes:
First resistor, first end are connected to the output end of each acquisition unit, the second end connection of the first resistor
The input terminal of the first switch tube；
Second resistance is connected in parallel on the first switch tube both ends；And
Zener diode is connected between the second resistance and the first switch tube output end, the zener diode
Anode connect with the output end of the first switch tube.
Preferably, the first switch tube is N-type triode, and the second switch is p-type triode, and described second opens
The base stage for closing pipe is connect with the cathode of the zener diode.
Preferably, the benchmark generating unit includes:
First diode, cathode are connect with the emitter of the second switch；
First comparator, inverting input terminal connect the anode of the first diode, the anti-phase input of the first comparator
End connects one first bleeder circuit by a pull-up resistor Ra connection power end Vcc, the non-inverting input terminal of the first comparator
Output end, first bleeder circuit includes the 3rd resistor being arranged in series and the 4th resistance, the first of the 3rd resistor
End connection power end Vcc, the second end ground connection of the 4th resistance；
Second bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, the first end connection of the 5th resistance
The output end of the first comparator, the second end ground connection of the 6th resistance.
Preferably, the comparing unit includes:
Second diode, cathode are connect with the cathode of the zener diode；
Second comparator, non-inverting input terminal pass through a pull-up resistor Ra connection power end Vcc, the reverse phase of second comparator
Input terminal is connect with the output end of second bleeder circuit；The output end of second comparator and the first switch tube
Base stage connection.
Preferably, the signal enhancement unit includes:
Third comparator, non-inverting input terminal are connect with the output end of second comparator, the same phase of the third comparator
Input terminal passes through a pull-up resistor Ra connection power end Vcc；
Third bleeder circuit comprising the first end of concatenated 7th resistance and the 8th resistance, the 7th resistance connects power supply
Vcc, the second end ground connection of the 8th resistance are held, the output end of the third bleeder circuit connects the anti-of the third comparator
Phase input terminal；
NOT gate is connected to the output end of the third comparator, the control of the non-gate output terminal and accessory power supply switch
End connection processed.
Preferably, when the NOT gate exports low level, the contactor is remained off；When the NOT gate exports height
It when level, triggers the accessory power supply and closes the switch, and then trigger the contact closure of the contactor, the output of the breaker
End is directly grounded by the contactor.
Compared with prior art, the beneficial effect that the present invention includes is:
1, breaker actuation sensitivity when failure occurs can be improved in the present invention, shortens the reaction time of breaker, in time by event
Hinder route excision, avoids the safety for further influencing line facility；
2, simultaneously when high current generates, action signal is generated by protection circuit, triggering contactor movement is direct by high current
Ground connection avoids high current from damaging equipment, further protects line facility；
3, when ground fault is eliminated, contactor and protection circuit automatically reset, without human intervention, simple, safe and reliable.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is overall schematic of the invention；
Fig. 2 is the circuit diagram for protecting circuit.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to comment
It can implement accordingly.
As shown in Figs. 1-2, the present invention provides a kind of shipboard automation device with failure removal function, including it is adjustable
Reactor Tc, acquisition unit, contactor Ka and protection circuit.
REgulatable reactor Tc is connected between three-phase line neutral point and ground wire, when singlephase earth fault occurs for route,
Neutral point voltage absolute value rises to faulted phase voltage absolute value from 0V, to generate flyback pulse electricity on REgulatable reactor Tc
Pressure, the pulse voltage flow through circuit breaker Q s i.e. and can trigger circuit breaker Q s movement for line disconnection, protect equipment safety, avoid route
Longtime running is in ground-fault condition to damage equipment.
Although can quickly trigger circuit breaker Q s movement by the way that REgulatable reactor Tc is arranged, shorten when cut-offfing of circuit breaker Q s
Between, the operational safety of effective protection equipment, but the pulse voltage for triggering circuit breaker Q s movement also can cause to rush moment to route
It hits, is easily damaged equipment, the present invention is provided with contactor thus and pulse voltage is introduced into earthed system by protection circuit, i.e.,
Improve the draw property of circuit breaker Q s, secure line facility is not impacted by pulse voltage and damaged.
Specifically, being respectively arranged with an acquisition unit Ta1- Ta3 on each phase line, acquisition unit is for acquiring institute
The electric signal of electric signal on the line, each acquisition unit acquisition is converted by the AC/DC of rectification module Vc1- Vc3
It is connected to the input terminal of the protection circuit altogether afterwards, that is, is sent to after the electric signal on each phase line is transformed into digital signal
It protects in circuit, protection circuit issues trigger signal, control contactor Ka movement according to the voltage swing received.
The contact series of contactor Ka are on the three-phase line between the output end and ground wire of circuit breaker Q s, the contact
In normally open.The movement of contact is controlled by contactor coil, when the coil is energized, then triggers contact movement closure, in turn
Control contactor Ka closure, that is, the output end of circuit breaker Q s is directly grounded by contactor Ka, by the pulse on route
Voltage introduces earthed system, the operational safety of equipment on protection circuit.
The coil of the contactor Ka is connected with an accessory power supply, accessory power supply switch, and the accessory power supply switch is one
Controllable switch, the control terminal of the accessory power supply switch is connect with the output end of the protection circuit, to pass through protection circuit
Come control contactor Ka coil whether it is electric, that is, control whether the contactor Ka is closed.
Protection circuit input terminal connect with the output end of the acquisition unit, it is described protect circuit output end with it is described
The accessory power supply of contactor Ka coil switchs connection, and the switch of the accessory power supply is in normally open, when the three-phase line
When singlephase earth fault occurs, the protection circuit is triggered, and closing the switch for the accessory power supply is controlled, so that the contact
Closure, pulse current is grounded, and protects equipment, while the circuit breaker Q s is triggered disconnection, by failure removal.
In above-mentioned technical proposal, as shown in Fig. 2, the protection circuit includes: that circuit, second switch, ratio occur for differential pressure
Compared with unit and signal enhancement unit.
Wherein, the input terminal that circuit occurs for differential pressure is connect with the output end of each acquisition unit, and 3 acquisition units will
Collected voltage signal is rectified into the input terminal for connecing altogether after direct current and circuit occurring with differential pressure, and the differential pressure occurs circuit and passes through
One first switch tube T1 ground connection.
Specifically, the differential pressure generation circuit includes:
First resistor R1, first end are connected to the output end of each acquisition unit, the second end of the first resistor R1
The input terminal of the first switch tube T1 is connected, the first switch tube T1 is N-type triode；
Second resistance R2 is connected in parallel on the both ends the first switch tube T1；And
Zener diode Dz is connected between the second resistance R2 and the first switch tube T1 output end, the pressure stabilizing
The anode of diode Dz is connect with the output end of the first switch tube T1.
Under normal condition, collected three-phase current flows into simultaneously occurs circuit in differential pressure, after circuit occurs by differential pressure
Ground connection, when first switch tube T1 both end voltage is in normal range (NR), that is, when three-phase line is in normal operating condition, the
One switch transistor T 1 is in the conductive state, and acquisition electric current is directly grounded after first resistor R1 and first switch tube T1.
And after singlephase earth fault occurs for three-phase line, the absolute value of neutral point voltage rises to faulted phase voltage from 0V
Absolute value, REgulatable reactor generates reversed big voltage, quickly triggers breaker actuation, shorten the reaction time of breaker, and
When faulty line is cut off, avoid the safety for further influencing line facility, while when high current generates, that is, acquiring
When pulse voltage when occurring to failure, final pulse voltage partial pressure in first resistor R1 and the both ends first switch tube T1, when
When the voltage at the both ends first switch tube T1 is greater than the breakdown voltage of zener diode Dz, zener diode Dz will be punctured.And work as
After Failure elimination, the voltage at the both ends first switch tube T1 is less than the breakdown voltage of zener diode Dz, zener diode Dz
It is automatic to restore.
The input terminal of second switch T2 connects the output end ground connection of power end a Vcc, the second switch T2, described
The control terminal of second switch T2 is connect with the output end that circuit occurs for the differential pressure, so that the on-off of second switch T2
The control of circuit is occurred by differential pressure.In the present embodiment, the second switch T2 is p-type triode, the second switch T2
Base stage connect with the cathode of the zener diode Dz.
In above-mentioned technical proposal, the non-inverting input terminal of comparing unit is connect with the output end that circuit occurs for the differential pressure, institute
The inverting input terminal for stating comparing unit is connected to the input terminal of the second switch T2 by a benchmark generating unit.Benchmark hair
Raw unit is for generating a reference signal, the output signal for synchronously control comparing unit.
Specifically, the benchmark generating unit includes:
First diode D1, cathode are connect with the emitter of the second switch T2；
First comparator OP1, inverting input terminal connect the anode of the first diode D1, the first comparator OP1's
Inverting input terminal connects one the by the non-inverting input terminal of pull-up resistor Ra connection power end a Vcc, the first comparator OP1
The output end of one bleeder circuit, first bleeder circuit includes the 3rd resistor R3 and the 4th resistance R4 being arranged in series, described
The first end of 3rd resistor R3 connects power end Vcc, the second end ground connection of the 4th resistance R4；
Second bleeder circuit comprising the 5th resistance R5 being arranged in series and the 6th resistance R6, the first of the 5th resistance R5
End connects the output end of the first comparator OP1, the second end ground connection of the 6th resistance R6.
When normal condition, zener diode Dz is not turned on, and the cathode of zener diode Dz is in high potential, second switch
T2 is in an off state, that is, the inverting input terminal of first comparator OP1 is in high potential state, and the current potential is higher than the
The output voltage of one bleeder circuit, that is, it is higher than the non-inverting input terminal voltage of first comparator OP1, so that first comparator
OP1 exports low level signal, so that the second bleeder circuit exports low level signal.
And when three-phase line generation singlephase earth fault, zener diode Dz is breakdown and is grounded, zener diode Dz's
Cathode is in low potential, triggering second switch T2 conducting ground connection, that is, the inverting input terminal of first comparator OP1 and is in low
Potential state, so that first comparator OP1 exports high level signal, so that the second bleeder circuit exports high level signal.
After Failure elimination, zener diode Dz restores automatically, and second switch T2 is disconnected automatically, and the second bleeder circuit is extensive
Low level signal is exported again.
The comparing unit includes:
Second diode D2, cathode are connect with the cathode of the zener diode Dz；
Second comparator OP2, non-inverting input terminal pass through pull-up resistor Ra connection power end a Vcc, the second comparator OP2
Inverting input terminal connect with the output end of second bleeder circuit；The output end of the second comparator OP2 and described the
The base stage of one switch transistor T 1 connects, and controls the on-off of first switch tube T1.
When normal condition, the second bleeder circuit exports low level signal, that is to say the inverting input terminal of the second comparator OP2
In low potential, the non-inverting input terminal of the second comparator OP2 is in high potential, so that the second comparator OP2 exports high level, into
And first switch tube T1 is kept on.
When singlephase earth fault occurs, the second bleeder circuit exports high level signal, that is to say the second comparator OP2's
Inverting input terminal is in high potential, and the non-inverting input terminal of the second comparator OP2 that is to say place by being grounded after zener diode Dz
In low potential, so that the second comparator OP2 exports low level, so that first switch tube T1 is in an off state, acquisition electricity
Stream is grounded after resistance R1, resistance R2 and zener diode Dz.
And after Failure elimination, zener diode Dz restores automatically, and second switch T2 is disconnected automatically, the second bleeder circuit
Restore output low level signal, the second comparator OP2 exports high level, and first switch tube T1 is connected again.
In above-mentioned technical proposal, signal enhancement unit be used to improve protection circuit output signal through determination, it is electric for auxiliary
Source switch provides reliable control signal, avoids the malfunction of accessory power supply switch or is failure to actuate.Specifically, signal enhancement unit is defeated
Enter end simultaneously connect with the control terminal of the output end of the comparing unit, first switch tube T1, the signal enhancement unit it is defeated
Outlet is connected to the control terminal of the accessory power supply switch.
As shown in Fig. 2, the signal enhancement unit includes:
Third comparator OP3, non-inverting input terminal are connect with the output end of the second comparator OP2, the third comparator
The non-inverting input terminal of OP3 passes through a pull-up resistor Ra connection power end Vcc；
Third bleeder circuit comprising the first end of concatenated 7th resistance R7 and the 8th resistance R8, the 7th resistance R7 connect
Power end Vcc, the second end ground connection of the 8th resistance R7 are met, the output end of the third bleeder circuit connects the third ratio
Compared with the inverting input terminal of device OP3；
NOT gate U, is connected to the output end of the third comparator OP3, and the NOT gate U output end and the accessory power supply switch
Control terminal connection.
When normal condition, first switch tube T1 is kept on, and the second comparator OP2 exports high level, that is,
The non-inverting input terminal of third comparator OP3 is in high level state, and is higher than the output voltage values of third bleeder circuit, so that the
Three comparator OP3 export high level signal.The NOT gate U exports low level, contactor Ka coil no power, the contactor Ka
It remains off.
When singlephase earth fault occurs, first switch tube T1 is in an off state, and the second comparator OP2 exports low electricity
It puts down, that is, the non-inverting input terminal of third comparator OP3 is in low level state, and is less than the output voltage of third bleeder circuit
Value, so that third comparator OP3 exports low level signal.The NOT gate U exports high level, triggers the accessory power supply switch and closes
It closes, and then triggers the contact closure of the contactor Ka, the output end of the circuit breaker Q s is directly connect by the contactor Ka
Pulse current is directly grounded by ground after circuit breaker Q s, and triggering circuit breaker Q s is acted in time by failure removal, while will big electricity
After stream introduces earthed system, the equipment on protection circuit avoids being hit and damaging.
And after Failure elimination, zener diode Dz restores automatically, and the second comparator OP2 exports high level, and third compares
Device OP3 exports high level signal, and first switch tube T1 is connected again, and contactor Ka is backed off, and control circuit breaker Q s reset is
Route can be put into normal operating conditions again.
In the present embodiment, the voltage of each power end Vcc is 5V, and the resistance value of resistance Ra can be 8K ohm, resistance R1's
Resistance value is less than 10 ohm, and the resistance value of resistance R2 can be 500 ohm, and the resistance value of resistance R3-R8 can be equal, such as 300 ohm.
From the above mentioned, circuit breaker Q s operating sensitivity when failure occurs can be improved in the present invention, shortens the anti-of circuit breaker Q s
Between seasonable, faulty line is cut off in time, avoids the safety for further influencing line facility；Simultaneously when high current generates,
Action signal is generated by protection circuit, high current is directly grounded, high current damage is avoided to set by triggering contactor Ka movement
It is standby, further protect line facility；Further, when ground fault is eliminated, contactor Ka and protection circuit automatically reset,
Without human intervention, simple, safe and reliable.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easy
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of shipboard automation device with failure removal function characterized by comprising
REgulatable reactor is connected between three-phase line neutral point and ground wire；
Acquisition unit is connected on each phase line, for acquire electric signal on the line；
Contactor, for contact series on the three-phase line between the output end and ground wire of breaker, the contact is in normal
Open state；And
Circuit is protected, input terminal is connect with the output end of the acquisition unit, and the output end of the protection circuit connects with described
The switch of the accessory power supply of tentaculum coil connects, and the switch of the accessory power supply is in normally open, when the three-phase line is sent out
When raw singlephase earth fault, the protection circuit is triggered, and closing the switch for the accessory power supply is controlled, so that the contact is closed
It closes, the breaker is triggered disconnection.
2. as described in claim 1 with the shipboard automation device of failure removal function, which is characterized in that on every phase line
An acquisition unit is respectively set, the electric signal of each acquisition unit acquisition is connected to described altogether after AC/DC is converted
Protect the input terminal of circuit.
3. as claimed in claim 2 with the shipboard automation device of failure removal function, which is characterized in that the contactor
Coil and the accessory power supply, accessory power supply switch connect, the accessory power supply switch is a controllable switch, and the auxiliary is electric
The control terminal of source switch is connect with the output end of the protection circuit.
4. as claimed in claim 3 with the shipboard automation device of failure removal function, which is characterized in that the protection electricity
Road includes:
Circuit occurs for differential pressure, and input terminal connect with the output end of the acquisition unit, and the differential pressure generation circuit passes through one the
One switching tube ground connection；
Second switch, input terminal connect a power end Vcc, and the output end ground connection of the second switch, described second opens
The control terminal for closing pipe is connect with the output end that circuit occurs for the differential pressure；
Comparing unit, non-inverting input terminal are connect with the output end that circuit occurs for the differential pressure, and the reverse phase of the comparing unit is defeated
Enter the input terminal that end is connected to the second switch by a benchmark generating unit；And
Signal enhancement unit, input terminal are connect with the control terminal of the output end of the comparing unit, first switch tube simultaneously, institute
The output end for stating signal enhancement unit is connected to the control terminal of the accessory power supply switch.
5. as claimed in claim 4 with the shipboard automation device of failure removal function, which is characterized in that the differential pressure hair
Giving birth to circuit includes:
First resistor, first end are connected to the output end of each acquisition unit, the second end connection of the first resistor
The input terminal of the first switch tube；
Second resistance is connected in parallel on the first switch tube both ends；And
Zener diode is connected between the second resistance and the first switch tube output end, the zener diode
Anode connect with the output end of the first switch tube.
6. as claimed in claim 5 with the shipboard automation device of failure removal function, which is characterized in that described first opens
Guan Guanwei N-type triode, the second switch are p-type triode, the base stage of the second switch and two pole of pressure stabilizing
The cathode of pipe connects.
7. as claimed in claim 6 with the shipboard automation device of failure removal function, which is characterized in that the benchmark hair
Giving birth to unit includes:
First diode, cathode are connect with the emitter of the second switch；
First comparator, inverting input terminal connect the anode of the first diode, the anti-phase input of the first comparator
End connects one first bleeder circuit by a pull-up resistor Ra connection power end Vcc, the non-inverting input terminal of the first comparator
Output end, first bleeder circuit includes the 3rd resistor being arranged in series and the 4th resistance, the first of the 3rd resistor
End connection power end Vcc, the second end ground connection of the 4th resistance；
Second bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, the first end connection of the 5th resistance
The output end of the first comparator, the second end ground connection of the 6th resistance.
8. as claimed in claim 7 with the shipboard automation device of failure removal function, which is characterized in that described relatively more single
Member includes:
Second diode, cathode are connect with the cathode of the zener diode；
Second comparator, non-inverting input terminal pass through a pull-up resistor Ra connection power end Vcc, the reverse phase of second comparator
Input terminal is connect with the output end of second bleeder circuit；The output end of second comparator and the first switch tube
Base stage connection.
9. as claimed in claim 8 with the shipboard automation device of failure removal function, which is characterized in that the signal is strong
Changing unit includes:
Third comparator, non-inverting input terminal are connect with the output end of second comparator, the same phase of the third comparator
Input terminal passes through a pull-up resistor Ra connection power end Vcc；
Third bleeder circuit comprising the first end of concatenated 7th resistance and the 8th resistance, the 7th resistance connects power supply
Vcc, the second end ground connection of the 8th resistance are held, the output end of the third bleeder circuit connects the anti-of the third comparator
Phase input terminal；
NOT gate is connected to the output end of the third comparator, the control of the non-gate output terminal and accessory power supply switch
End connection processed.
10. as claimed in claim 9 with the shipboard automation device of failure removal function, which is characterized in that when described non-
When door output low level, the contactor is remained off；When the NOT gate exports high level, the accessory power supply is triggered
It closes the switch, and then triggers the contact closure of the contactor, the output end of the breaker is directly connect by the contactor
Ground.
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| CN104022498A (en) * | 2014-06-10 | 2014-09-03 | 高盛输变电设备（浙江）有限公司 | Device for arc discharging protecting in switch cabinet |
| CN108075451A (en) * | 2017-12-26 | 2018-05-25 | 江苏奥畋工程科技有限公司 | A kind of shipping shore power system that there is failure and cut off automatically |
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