CN109921394B - Ship automation device with fault removal function - Google Patents
Ship automation device with fault removal function Download PDFInfo
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- CN109921394B CN109921394B CN201910298806.6A CN201910298806A CN109921394B CN 109921394 B CN109921394 B CN 109921394B CN 201910298806 A CN201910298806 A CN 201910298806A CN 109921394 B CN109921394 B CN 109921394B
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Abstract
The invention discloses a ship automation device with a fault removal function, which comprises an adjustable reactor, a fault detection circuit and a fault detection circuit, wherein the adjustable reactor is connected between a neutral point and a ground wire of a three-phase line; the acquisition unit is connected to each phase line and used for acquiring electric signals on the line; the contactor has contacts connected in series between the output end of the breaker and the ground wire on the three-phase line, and the contacts are in a normally open state; and the input end of the protection circuit is connected with the output end of the acquisition unit, the output end of the protection circuit is connected with a switch of an auxiliary power supply of the contactor coil, the switch of the auxiliary power supply is in a normally open state, and when a single-phase earth fault occurs on the three-phase line, the protection circuit is triggered to control the switch of the auxiliary power supply to be closed, so that the contact is closed, and meanwhile, the circuit breaker is triggered to be opened. The invention solves the technical problem that the power utilization fault of the ship cannot be timely removed.
Description
Technical Field
The invention relates to the technical field of ship electricity, in particular to a ship automation device with a fault clearing function.
Background
The ship alternating current power supply system generally adopts a three-phase three-wire system, has high requirements on power supply stability and continuity so as to ensure the reliability of the power supply to the ship, but has high complexity, and has different ship power supply systems, so that the ship alternating current power supply system breaks down to influence normal operation and power supply to the ship.
The single-phase earth fault is the most common fault of a power distribution system, intermittent arc light grounding can occur after the single-phase earth fault occurs, resonance overvoltage is caused, overvoltage which is several times of normal voltage is generated, the overvoltage further enables insulators on a line to be subjected to insulation breakdown, serious short-circuit accidents are caused, a part of distribution transformers can be burnt out at the same time, a lightning arrester and a fuse on the line are subjected to insulation breakdown and burning, an electrical fire can also occur, and the influence on the safe operation of ships can cause hidden dangers.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention aims to provide a ship automation device with a fault removal function, which is characterized in that a contactor and a protection circuit are used in a matched mode, when a ground fault occurs, a reverse large voltage is generated through an adjustable reactor connected between a neutral point and the ground, the action of the breaker is triggered quickly, the reaction time of the breaker is shortened, a fault line is removed in time, the safety of line equipment is prevented from being further influenced, and when a large current is generated, an action signal is generated through the protection circuit to trigger the contactor to act, the large current is directly grounded, and the line equipment is further protected.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a ship automation device having a fault clearing function, including:
the adjustable reactor is connected between a neutral point of the three-phase line and a ground wire;
the acquisition unit is connected to each phase line and used for acquiring electric signals on the line;
the contactor has contacts connected in series between the output end of the breaker and the ground wire on the three-phase line, and the contacts are in a normally open state; and
and when the three-phase line has a single-phase ground fault, the protection circuit is triggered to control the switch of the auxiliary power supply to be closed, so that the contact is closed, and the circuit breaker is triggered to be opened.
Preferably, each phase line is provided with one acquisition unit, and the electric signals acquired by the acquisition units are subjected to AC/DC conversion and then are commonly connected to the input end of the protection circuit.
Preferably, the coil of the contactor is connected in series with the auxiliary power supply and the auxiliary power supply switch, the auxiliary power supply switch is a controllable switch, and the control end of the auxiliary power supply switch is connected with the output end of the protection circuit.
Preferably, the protection circuit includes:
the input end of the differential pressure generating circuit is connected with the output end of the acquisition unit, and the differential pressure generating circuit is grounded through a first switch tube;
the input end of the second switching tube is connected with a power supply end Vcc, the output end of the second switching tube is grounded, and the control end of the second switching tube is connected with the output end of the differential pressure generating circuit;
the non-inverting input end of the comparison unit is connected with the output end of the differential pressure generation circuit, and the inverting input end of the comparison unit is connected to the input end of the second switch tube through a reference generation unit; and
and the input end of the signal strengthening unit is simultaneously connected with the output end of the comparison unit and the control end of the first switch tube, and the output end of the signal strengthening unit is connected to the control end of the auxiliary power switch.
Preferably, the differential pressure generation circuit includes:
a first end of the first resistor is connected to the output end of each acquisition unit, and a second end of the first resistor is connected with the input end of the first switch tube;
the second resistor is connected in parallel to two ends of the first switching tube; and
and the voltage stabilizing diode is connected between the second resistor and the output end of the first switching tube in series, and the anode of the voltage stabilizing diode is connected with the output end of the first switching tube.
Preferably, the first switch tube is an N-type triode, the second switch tube is a P-type triode, and a base of the second switch tube is connected with a negative electrode of the voltage stabilizing diode.
Preferably, the reference generation unit includes:
the cathode of the first diode is connected with the emitter of the second switching tube;
the inverting input end of the first comparator is connected with the anode of the first diode, the inverting input end of the first comparator is connected with a power supply end Vcc through a pull-up resistor Ra, the non-inverting input end of the first comparator is connected with the output end of a first voltage division circuit, the first voltage division circuit comprises a third resistor and a fourth resistor which are arranged in series, the first end of the third resistor is connected with the power supply end Vcc, and the second end of the fourth resistor is grounded;
and the second voltage division circuit comprises a fifth resistor and a sixth resistor which are arranged in series, wherein the first end of the fifth resistor is connected with the output end of the first comparator, and the second end of the sixth resistor is grounded.
Preferably, the comparison unit includes:
the cathode of the second diode is connected with the cathode of the voltage stabilizing diode;
a second comparator, the non-inverting input terminal of which is connected to the power supply terminal Vcc through a pull-up resistor Ra, and the inverting input terminal of which is connected to the output terminal of the second voltage division circuit; the output end of the second comparator is connected with the base electrode of the first switching tube.
Preferably, the signal enhancing unit includes:
a third comparator, the non-inverting input terminal of which is connected with the output terminal of the second comparator, and the non-inverting input terminal of the third comparator is connected with a power supply terminal Vcc through a pull-up resistor Ra;
a third voltage dividing circuit, which comprises a seventh resistor and an eighth resistor connected in series, wherein a first end of the seventh resistor is connected with a power supply terminal Vcc, a second end of the eighth resistor is grounded, and an output end of the third voltage dividing circuit is connected with an inverting input end of the third comparator;
and the output end of the NOT gate is connected with the control end of the auxiliary power supply switch.
Preferably, when the not gate outputs a low level, the contactor maintains an open state; when the NOT gate outputs a high level, the auxiliary power switch is triggered to be closed, then the contact of the contactor is triggered to be closed, and the output end of the circuit breaker is directly grounded through the contactor.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can improve the action sensitivity of the breaker when a fault occurs, shorten the reaction time of the breaker, cut off the fault line in time and avoid further influencing the safety of line equipment;
2. meanwhile, when a large current is generated, an action signal is generated through the protection circuit to trigger the contactor to act, the large current is directly grounded, the equipment is prevented from being damaged by the large current, and the line equipment is further protected;
3. when the ground fault is eliminated, the contactor and the protection circuit are automatically reset, manual operation is not needed, and the method is simple, safe and reliable.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is an overall schematic view of the present invention;
fig. 2 is a circuit diagram of a protection circuit.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.
As shown in fig. 1-2, the present invention provides a ship automation device with a fault removal function, which includes an adjustable reactor Tc, a collection unit, a contactor Ka, and a protection circuit.
The adjustable reactor Tc is connected between a neutral point and a ground wire of a three-phase line, when the line has a single-phase earth fault, the absolute value of the voltage of the neutral point is increased from 0V to the absolute value of the voltage of a fault phase, so that flyback pulse voltage is generated on the adjustable reactor Tc, the pulse voltage flows through the circuit breaker Qs to trigger the circuit breaker Qs to break the line, equipment is protected to be safe, and the situation that the line runs in an earth fault state for a long time to damage the equipment is avoided.
Although the adjustable reactor Tc can quickly trigger the action of the breaker Qs, the on-off time of the breaker Qs is shortened, and the operation safety of equipment is effectively protected, the pulse voltage triggering the action of the breaker Qs can also impact a circuit instantly and damage the equipment easily.
Specifically, each phase line is provided with an acquisition unit Ta1-Ta3, the acquisition units are used for acquiring electric signals on the line, the electric signals acquired by each acquisition unit are subjected to AC/DC conversion by rectifier modules Vc1-Vc3 and then are commonly connected to the input end of the protection circuit, that is, the electric signals on each phase line are converted into digital signals and then are transmitted to the protection circuit, and the protection circuit sends out trigger signals according to the received voltage to control the action of the contactor Ka.
And the contact of the contactor Ka is connected between the output end of the breaker Qs and the ground wire on the three-phase line in series, and the contact is in a normally open state. The action of the contact is controlled by the coil of the contactor, when the coil is electrified, the contact is triggered to act and close, and then the contactor Ka is controlled to close, namely, the output end of the breaker Qs is directly grounded through the contactor Ka, pulse voltage on a line is introduced into a grounding system, and the operation safety of equipment on the line is protected.
The coil of contactor Ka and an auxiliary power supply, auxiliary power supply switch are established ties, auxiliary power supply switch is a controllable switch, auxiliary power supply switch's control end with protection circuit's output is connected to whether come control contactor Ka coil through protection circuit and be electrified, also control whether contactor Ka is closed.
The input end of the protection circuit is connected with the output end of the acquisition unit, the output end of the protection circuit is connected with an auxiliary power switch of the Ka coil of the contactor, the switch of the auxiliary power supply is in a normally open state, when a single-phase grounding fault occurs to the three-phase line, the protection circuit is triggered to control the switch of the auxiliary power supply to be closed, so that the contact is closed, the pulse current is grounded, the equipment is protected, and meanwhile, the circuit breaker Qs is triggered to be disconnected to cut off the fault.
In the above technical solution, as shown in fig. 2, the protection circuit includes: the differential pressure generating circuit, the second switch tube, the comparing unit and the signal strengthening unit.
The input end of the differential pressure generating circuit is connected with the output end of each acquisition unit, the 3 acquisition units rectify acquired voltage signals into direct current and then are connected with the input end of the differential pressure generating circuit in common, and the differential pressure generating circuit is grounded through a first switch tube T1.
Specifically, the differential pressure generation circuit includes:
a first resistor R1, a first end of which is connected to the output end of each of the acquisition units, a second end of the first resistor R1 is connected to the input end of the first switch transistor T1, and the first switch transistor T1 is an N-type triode;
a second resistor R2 connected in parallel across the first switch transistor T1; and
a zener diode Dz connected in series between the second resistor R2 and the output terminal of the first switching transistor T1, wherein the anode of the zener diode Dz is connected to the output terminal of the first switching transistor T1.
Under normal conditions, the three-phase current of gathering flows in at differential pressure generating circuit simultaneously, and through ground connection behind the differential pressure generating circuit, when first switch tube T1 both ends voltage is in normal range, when also being in normal operating condition that the three-phase line is, first switch tube T1 is in the on-state, and the direct ground connection behind gathering current process first resistance R1 and first switch tube T1.
When a single-phase earth fault occurs in a three-phase line, the absolute value of the neutral point voltage is increased from 0V to the absolute value of the fault phase voltage, the adjustable reactor generates a large reverse voltage, the breaker is triggered quickly to act, the response time of the breaker is shortened, the fault line is cut off in time, the safety of line equipment is prevented from being further influenced, meanwhile, when a large current is generated, namely pulse voltage generated when the fault occurs is collected, the pulse voltage is finally divided and compressed at two ends of the first resistor R1 and the first switch tube T1, and when the voltage at two ends of the first switch tube T1 is greater than the breakdown voltage of the voltage stabilizing diode Dz, the voltage stabilizing diode Dz is broken down. When the fault is eliminated, the voltage across the first switch tube T1 is less than the breakdown voltage of the zener diode Dz, and the zener diode Dz can recover automatically.
The input end of the second switch tube T2 is connected to a power supply terminal Vcc, the output end of the second switch tube T2 is grounded, and the control end of the second switch tube T2 is connected to the output end of the differential pressure generation circuit, so that the on/off of the second switch tube T2 is controlled by the differential pressure generation circuit. In this embodiment, the second switch tube T2 is a P-type triode, and the base of the second switch tube T2 is connected to the negative electrode of the zener diode Dz.
In the above technical solution, a non-inverting input terminal of the comparing unit is connected to an output terminal of the differential pressure generating circuit, and an inverting input terminal of the comparing unit is connected to an input terminal of the second switching tube T2 through a reference generating unit. The reference generating unit is used for generating a reference signal for synchronously controlling the output signal of the comparing unit.
Specifically, the reference generation unit includes:
a first diode D1, the cathode of which is connected to the emitter of the second switch tube T2;
a first comparator OP1, an inverting input terminal of which is connected to the anode of the first diode D1, an inverting input terminal of the first comparator OP1 is connected to the power supply terminal Vcc through a pull-up resistor Ra, a non-inverting input terminal of the first comparator OP1 is connected to an output terminal of a first voltage dividing circuit, the first voltage dividing circuit includes a third resistor R3 and a fourth resistor R4 arranged in series, a first terminal of the third resistor R3 is connected to the power supply terminal Vcc, and a second terminal of the fourth resistor R4 is grounded;
and the second voltage division circuit comprises a fifth resistor R5 and a sixth resistor R6 which are arranged in series, wherein a first end of the fifth resistor R5 is connected with the output end of the first comparator OP1, and a second end of the sixth resistor R6 is grounded.
In a normal state, the zener diode Dz is not conducting, the cathode of the zener diode Dz is at a high potential, and the second switch T2 is in an off state, that is, the inverting input terminal of the first comparator OP1 is at a high potential state, and the potential is higher than the output voltage of the first voltage divider circuit, that is, the voltage of the non-inverting input terminal of the first comparator OP1, so that the first comparator OP1 outputs a low level signal, and the second voltage divider circuit outputs a low level signal.
When a single-phase ground fault occurs in the three-phase line, the zener diode Dz is broken down and grounded, the cathode of the zener diode Dz is at a low potential, and the second switching tube T2 is triggered to be conducted to the ground, that is, the inverting input terminal of the first comparator OP1 is at a low potential state, so that the first comparator OP1 outputs a high level signal, and the second voltage division circuit outputs a high level signal.
When the fault is eliminated, the zener diode Dz automatically recovers, the second switching tube T2 automatically turns off, and the second voltage division circuit recovers to output a low level signal.
The comparison unit includes:
a second diode D2 having a cathode connected to the cathode of the zener diode Dz;
a second comparator OP2, wherein the non-inverting input terminal thereof is connected to the power supply terminal Vcc through a pull-up resistor Ra, and the inverting input terminal of the second comparator OP2 is connected to the output terminal of the second voltage division circuit; the output end of the second comparator OP2 is connected with the base of the first switch tube T1 to control the on-off of the first switch tube T1.
In a normal state, the second voltage dividing circuit outputs a low level signal, that is, the inverting input terminal of the second comparator OP2 is at a low level, and the non-inverting input terminal of the second comparator OP2 is at a high level, so that the second comparator OP2 outputs a high level, and the first switch transistor T1 is kept in a conducting state.
When a single-phase ground fault occurs, the second voltage division circuit outputs a high level signal, that is, the inverting input terminal of the second comparator OP2 is at a high potential, the non-inverting input terminal of the second comparator OP2 is grounded through the zener diode Dz, that is, at a low potential, so that the second comparator OP2 outputs a low level, and further the first switching tube T1 is in a disconnected state, and the acquisition current is grounded through the resistor R1, the resistor R2, and the zener diode Dz.
When the fault is eliminated, the zener diode Dz automatically recovers, the second switch tube T2 automatically turns off, the second voltage dividing circuit recovers to output a low level signal, the second comparator OP2 outputs a high level, and the first switch tube T1 is turned on again.
In the technical scheme, the signal strengthening unit is used for improving the output signal of the protection circuit, providing a reliable control signal for the auxiliary power switch and avoiding the misoperation or non-operation of the auxiliary power switch. Specifically, the input end of the signal enhancement unit is connected to the output end of the comparison unit and the control end of the first switch tube T1, and the output end of the signal enhancement unit is connected to the control end of the auxiliary power switch.
As shown in fig. 2, the signal enhancing unit includes:
a third comparator OP3, the non-inverting input terminal of which is connected to the output terminal of the second comparator OP2, the non-inverting input terminal of the third comparator OP3 being connected to the power supply terminal Vcc through a pull-up resistor Ra;
a third voltage dividing circuit, which comprises a seventh resistor R7 and an eighth resistor R8 connected in series, wherein a first end of the seventh resistor R7 is connected to a power supply terminal Vcc, a second end of the eighth resistor R7 is grounded, and an output end of the third voltage dividing circuit is connected to an inverting input end of the third comparator OP 3;
and a not gate U connected to an output terminal of the third comparator OP3, wherein an output terminal of the not gate U is connected to a control terminal of the auxiliary power switch.
In the normal state, the first switch tube T1 is kept in the conducting state, and the second comparator OP2 outputs a high level, that is, the non-inverting input terminal of the third comparator OP3 is in a high level state and is higher than the output voltage value of the third voltage dividing circuit, so that the third comparator OP3 outputs a high level signal. The NOT gate U outputs low level, the coil of the contactor Ka is not electrified, and the contactor Ka keeps an off state.
When a single-phase ground fault occurs, the first switching tube T1 is in an off state, the second comparator OP2 outputs a low level, that is, the non-inverting input terminal of the third comparator OP3 is in a low level state and is smaller than the output voltage value of the third voltage dividing circuit, so that the third comparator OP3 outputs a low level signal. Not gate U output high level triggers auxiliary power switch is closed, and then triggers contactor Ka's contact is closed, circuit breaker Qs's output passes through contactor Ka direct ground connection, with pulse current through circuit breaker Qs back direct ground connection, triggers circuit breaker Qs in time to act and amputate the trouble, introduces grounding system with the heavy current simultaneously after, equipment on the protection circuit avoids receiving the impact and damages.
When the fault is eliminated, the voltage stabilizing diode Dz automatically recovers, the second comparator OP2 outputs high level, the third comparator OP3 outputs high level signal, the first switch tube T1 is conducted again, the contactor Ka is disconnected again, and the circuit breaker Qs is controlled to reset, so that the circuit can be put into normal working state again.
In this embodiment, the voltage of each power source terminal Vcc is 5V, the resistance of the resistor Ra may be 8K ohms, the resistance of the resistor R1 is less than 10 ohms, the resistance of the resistor R2 may be 500 ohms, and the resistances of the resistors R3-R8 may be equal, for example, 300 ohms.
Therefore, the action sensitivity of the circuit breaker Qs when a fault occurs can be improved, the reaction time of the circuit breaker Qs is shortened, a fault line is cut off in time, and the safety of line equipment is prevented from being further influenced; meanwhile, when a large current is generated, an action signal is generated through the protection circuit, the contactor Ka is triggered to act, the large current is directly grounded, the equipment is prevented from being damaged by the large current, and the line equipment is further protected; furthermore, when the ground fault is eliminated, the contactor Ka and the protection circuit automatically reset without manual operation, and the method is simple, safe and reliable.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (9)
1. A ship automation device having a trouble shooting function, characterized by comprising:
the adjustable reactor is connected between a neutral point of the three-phase line and a ground wire;
the acquisition unit is connected to each phase line and used for acquiring electric signals on the line;
the contactor has contacts connected in series between the output end of the breaker and the ground wire on the three-phase line, and the contacts are in a normally open state; and
the input end of the protection circuit is connected with the output end of the acquisition unit, the output end of the protection circuit is connected with a switch of an auxiliary power supply of the contactor coil, the switch of the auxiliary power supply is in a normally open state, when a single-phase ground fault occurs on the three-phase line, the protection circuit is triggered to control the switch of the auxiliary power supply to be closed, so that the contact is closed, and the circuit breaker is triggered to be opened;
the protection circuit includes:
the input end of the differential pressure generating circuit is connected with the output end of the acquisition unit, and the differential pressure generating circuit is grounded through a first switch tube;
the input end of the second switching tube is connected with a power supply end Vcc, the output end of the second switching tube is grounded, and the control end of the second switching tube is connected with the output end of the differential pressure generating circuit;
the non-inverting input end of the comparison unit is connected with the output end of the differential pressure generation circuit, and the inverting input end of the comparison unit is connected to the input end of the second switch tube through a reference generation unit; and
and the input end of the signal strengthening unit is simultaneously connected with the output end of the comparison unit and the control end of the first switch tube, and the output end of the signal strengthening unit is connected to the control end of the auxiliary power switch.
2. The ship automation device with fault clearing function as claimed in claim 1, wherein each phase circuit is provided with one of the collecting units, and the electric signals collected by the collecting units are subjected to AC/DC conversion and then are commonly connected to the input end of the protection circuit.
3. The ship automation device with a fault clearing function as claimed in claim 2, wherein the coil of the contactor is connected in series with the auxiliary power supply, the auxiliary power supply switch being a controllable switch, and a control terminal of the auxiliary power supply switch being connected to the output terminal of the protection circuit.
4. The ship automation device with a fault clearing function according to claim 3, wherein the differential pressure generation circuit includes:
a first end of the first resistor is connected to the output end of each acquisition unit, and a second end of the first resistor is connected with the input end of the first switch tube;
the second resistor is connected in parallel to two ends of the first switching tube; and
and the voltage stabilizing diode is connected between the second resistor and the output end of the first switching tube in series, and the anode of the voltage stabilizing diode is connected with the output end of the first switching tube.
5. The ship automation device with fault clearing function as claimed in claim 4, wherein the first switching tube is an N-type triode, the second switching tube is a P-type triode, and the base of the second switching tube is connected to the cathode of the zener diode.
6. The ship automation device with a trouble shooting function according to claim 5, characterized in that the reference generation unit includes:
the cathode of the first diode is connected with the emitter of the second switching tube;
the inverting input end of the first comparator is connected with the anode of the first diode, the inverting input end of the first comparator is connected with a power supply end Vcc through a pull-up resistor Ra, the non-inverting input end of the first comparator is connected with the output end of a first voltage division circuit, the first voltage division circuit comprises a third resistor and a fourth resistor which are arranged in series, the first end of the third resistor is connected with the power supply end Vcc, and the second end of the fourth resistor is grounded;
and the second voltage division circuit comprises a fifth resistor and a sixth resistor which are arranged in series, wherein the first end of the fifth resistor is connected with the output end of the first comparator, and the second end of the sixth resistor is grounded.
7. The ship automation device with a trouble shooting function according to claim 6, characterized in that the comparison unit includes:
the cathode of the second diode is connected with the cathode of the voltage stabilizing diode;
a second comparator, the non-inverting input terminal of which is connected to the power supply terminal Vcc through a pull-up resistor Ra, and the inverting input terminal of which is connected to the output terminal of the second voltage division circuit; the output end of the second comparator is connected with the base electrode of the first switching tube.
8. The ship automation device with a fault clearing function according to claim 7, wherein the signal strengthening unit includes:
a third comparator, the non-inverting input terminal of which is connected with the output terminal of the second comparator, and the non-inverting input terminal of the third comparator is connected with a power supply terminal Vcc through a pull-up resistor Ra;
a third voltage dividing circuit, which comprises a seventh resistor and an eighth resistor connected in series, wherein a first end of the seventh resistor is connected with a power supply terminal Vcc, a second end of the eighth resistor is grounded, and an output end of the third voltage dividing circuit is connected with an inverting input end of the third comparator;
and the output end of the NOT gate is connected with the control end of the auxiliary power supply switch.
9. The ship automation device with a fault clearing function according to claim 8, wherein the contactor maintains an open state when the not gate outputs a low level; when the NOT gate outputs a high level, the auxiliary power switch is triggered to be closed, then the contact of the contactor is triggered to be closed, and the output end of the circuit breaker is directly grounded through the contactor.
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| CN201910298806.6A CN109921394B (en) | 2019-04-15 | 2019-04-15 | Ship automation device with fault removal function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT405350B (en) * | 1997-02-12 | 1999-07-26 | Felten & Guilleaume Ag Oester | PROTECTIVE CIRCUIT ARRANGEMENT FOR SURGE PROTECTORS |
| CN102142674B (en) * | 2011-01-26 | 2013-10-16 | 江苏宏安变压器有限公司 | Method for selectively clearing single-phase ground fault of ship shore power system |
| CN202282612U (en) * | 2011-10-27 | 2012-06-20 | 蓝星化工新材料股份有限公司广西分公司 | Grounding discharge device |
| CN202424145U (en) * | 2012-01-04 | 2012-09-05 | 王金全 | Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor |
| 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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