CN105988046A - Detection method and detection system for judging alternating current signals being in series connection with direct current system - Google Patents
Detection method and detection system for judging alternating current signals being in series connection with direct current system Download PDFInfo
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- CN105988046A CN105988046A CN201510074029.9A CN201510074029A CN105988046A CN 105988046 A CN105988046 A CN 105988046A CN 201510074029 A CN201510074029 A CN 201510074029A CN 105988046 A CN105988046 A CN 105988046A
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Abstract
The invention discloses a detection method and a detection system for judging alternating current signals being in series connection with a direct current system. The detection method comprises the steps of S1 acquiring an alternating current value U of a control bus in the direct current system; S2, judging whether the alternating current value U exceeds a voltage threshold Uo or not, if so, executing a step S3, and if not, returning back to the step S1; S3, giving out inspection signals for each current detection device, enabling each current detection device to carry out alternating current component value I detection on a corresponding feed-out load, wherein a plurality of feed-out loads are provided, and the plurality of feed-out load are connected on the control bus in parallel; and S4, judging whether an alternating current component value I on each feed-out load exceeds a current threshold Io or not, wherein if the alternating current component value I on each feed-out load exceeds the current threshold, alternating current signals are serially connected to the direct current system, and if not, the alternating current signals are not serially connected to the direct current system. The detection method and the detection system for judging the alternating current signals being in series connection with the direct current system can judge whether the alternating current signals are serially connected to the direct current system or not, thereby being convenient for timely discovering the condition that the alternating current signals are serially connected to the direct current system.
Description
Technical field
The present invention relates to insulation tester for DC system, particularly relate to one and judge that AC signal seals in directly
The detection method of streaming system and system.
Background technology
Generation current factory electrical secondary system is made up of straight-flow system and AC system, and properly functioning two systems are mutual
Do not connect, when causing AC signal to seal in straight-flow system due to a variety of causes, to the exchange in AC system
The impact in loop is typically confined in this ac circuit, but for straight-flow system, but injures whole
Straight-flow system and DC loop, easily cause the fortune tripping operation by mistake of protection exit auxiliary reclay or cause direct current
Fuse failure causes whole relay fail accident.
Conventional exit relay operation voltage bears voltage-to-ground as reference with direct current, and operation voltage is direct current
The 55%-70% of voltage, it is impossible to prevent from exchanging the malfunction sealed in.Provincial power network seals in straight due to exchange in recent years
Stream cause maloperation repeatedly occur, for prevent the AC in the DC cause false protection, tripping and
The serious accident of plant stand full cut-off occurs, and National Energy Board " prevents the 20 of power generation fault about printing and distributing
Five important requirements (state can safety [2014] 161) " notice in point out about straight-flow system exchange string
The detection entered.
The equipment that in plant stand secondary circuit, common alternating current-direct current loop coexists includes:
Sealer: ac circuit includes printer power supply and mains lighting supply, uses alternating current-direct current hybrid power supply mould
Formula equipment component, such as carrier terminal equipment, inverter, GPS ac-dc switching power；Protection device power supply, behaviour
Make case and control the employing direct current supplys such as power supply.
Experiment power supply screen: this screen exports DC source simultaneously, alternating current power supply is tested for protection personnel.
Main transformer cooler terminal box: Cooler Power typically uses double cross stream to control for people's pattern, cooler
Loop uses direct current supply pattern.Main transformer overload starts air-cooled loop, overload locking pressure-control circuit,
Main transformer on-load voltage regulation case: on-load voltage regulation power supply is alternating current power supply, main shift remote signalling loop is that direct current returns
Road, it is ac circuit that main transformer winding temperature compensates loop, and the tripping operation of winding temperature height and alarm circuit are direct current
Loop.
Switch, disconnecting link terminal box: ac power supply circuit includes electric five anti-, switch operation power supply, open circuit
Device accumulation power supply, heater power source；DC power supply circuit includes that circuitbreaker control power supply, breaker tripping and closing are returned
Road, disconnecting link switching circuit (switching containing bus) etc..
The common cause in the AC in the DC loop: alternating current-direct current loop common cable；Terminal block humidity is coagulated
Dew, rainwater intrusion, alternating current-direct current cable failure, touch by mistake, the reason such as mis-wired causes alternating current-direct current string electricity；System
Unified time short circuit current seals in secondary circuit.
The AC in the DC proximity switch trip circuit is analyzed:
As it is shown in figure 1, C1, C2 are respectively the Equivalent Distributed electric capacity over the ground of trip(ping) circuit cable, C3 is
Equivalent Distributed electric capacity between trip(ping) circuit cable, C4 is the Equivalent Distributed electric capacity between two dc bus,
K1 is network control switch trip contact, and K2 is unit control room switch trip contact, and TJR is tripping operation relay
Device coil, AC is the equivalent AC power supply sealing in straight-flow system.
Under normal circumstances, Fig. 1 does not exist alternating current power supply AC, network control trip contact K1 Guan Bi or single
Unit's control room contact K2 Guan Bi, then tripping relay TJR action, trip signal sends.Seal in exchange
Under the failure condition of straight-flow system, due to length relatively big (500m) and the tripping operation relay of trip(ping) circuit cable
The operating power of device is less, and alternating current power supply, through cable distribution capacity C1, C2 over the ground, makes tripping relay
Action.
In conjunction with positive and negative alternating current over the ground on DC detecting principle equivalent circuit summary straight-flow system bus in Fig. 2
Pressure Cleaning Principle: one, independent alternating voltage Cleaning Principle, uses alternating-current meter to detect the most over the ground, if
Meter is convenient, it is achieved principle is simple, produces work core simple.But there is the biggest problem, owing to alternating-current meter uses
For the test scope of A.C. voltmeter, easily direct current with exchange superposition in the case of the exchange measured the most just
Really, secondly, when bus does not has alternating voltage, microcomputer insulating monitor start uneven bridge or in injustice
During Heng Qiao detection, easily produce AC signal, thus alternating-current meter detection shows certain alternating voltage
Value, actual do not have, and main reasons is that dc bus puts into resistance over the ground and causes direct current voltage-to-ground to change
And produce.Two, Signal separator alternating voltage Cleaning Principle, considers there is sample AC signal during principle design
And signal testing scope, and consider analog-to-digital conversion rate.Software approach is used directly to tie from analog digital conversion
Fruit isolates AC signal amount and direct current signal amount, solves uneven bridge Insulation monitoring to exchange detection
Impact.
The bus alternating voltage detection of mainly sampling of current the AC in the DC branch road determination methods adds bus branch road
Insulation alarm combines.When bus detection alternating voltage exceedes alarming value, start branch insulation detection, as
When really branch insulation detection exists grounding alarm, then corresponding branch road report exchange seals in branch road.This kind of method
Easily producing wrong report, if dc bus directly enters AC signal, corresponding ground connection electricity deposited by branch road simultaneously
Resistance, can seal in the exchange of this branch road of erroneous judgement.
Summary of the invention
The technical problem to be solved in the present invention is, it is provided that the judgement AC signal of a kind of improvement seals in direct current
The detection method of system and system.
The technical solution adopted for the present invention to solve the technical problems is: provide one to judge AC signal string
Enter the detection method of straight-flow system, comprise the steps:
S1: gather the ac voltage U of control bus in straight-flow system；
S2: judge that described ac voltage U whether more than a voltage threshold Uo, the most then performs step
S3, if it is not, return described step S1；
S3: each current sensing means is sent and patrols and examines signal so that each described current sensing means pair
Corresponding feed out load and carry out the detection of alternating current component value I, described in feed out load for several, and the most also
It is associated on described control bus；
S4: judge each described in feed out in load alternating current component value I whether more than a current threshold
Io, the most then judge have AC signal to seal in described straight-flow system；If it is not, then judge not seal in.
Preferably, in described step S4, described current threshold Io is calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the balance bridge electricity of described straight-flow system main frame
Resistance；
If described alternating current component value I ＞ Io, then judge have AC signal to seal in described straight-flow system；If
Described alternating current component value I≤Io, then judge to seal in described straight-flow system without AC signal.
Preferably, the described alternating voltage alarming value Ux that sets is as 10-15V.
Preferably, the precision≤0.05mA of described alternating current component value I.
Preferably, in described step S2, if described ac voltage U exceedes described voltage threshold Uo,
The most also send alarm signal.
Also provide for a kind of detecting system judging that AC signal seals in straight-flow system, including control bus and company
Be connected on the main frame on described control bus, several be connected in parallel on described control bus feed out load and point
Not do not feed out and load one_to_one corresponding and electrically connect to carry out alternating current component value I and detect and by inspection described in each
Alternating current component value I surveyed feeds back to the current sensing means of described main frame；
Wherein, described current sensing means includes:
Signal of patrolling and examining for sending according to described main frame carries out AC signal to feeding out load described in corresponding
The magnetic ring coil of detection, and the wire of electric current to be detected is through described magnetic ring coil；
The discharge circuit being connected with described magnetic ring coil, described AC signal being amplified；
Be connected with described discharge circuit, for will amplify after described AC signal analog digital conversion be described
Alternating current component value I the sample circuit exported；
Described main frame includes:
It is connected with described control bus, for gathering the collection of ac voltage U on described control bus
Circuit；
It is connected with described Acquisition Circuit, for a described ac voltage U and voltage threshold Uo is entered
Row relatively and exports comparative result and for described alternating current component value I and a current threshold Io being entered
Row relatively and exports the comparison circuit of judged result；
It is connected with described comparison circuit, optionally each described electric current examined according to described comparative result
Survey device send described in patrol and examine signal, each described current sensing means fed out described in corresponding
Load carries out the routing inspection circuit of alternating current component value I detection.
Preferably, described current threshold Io is calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the balance bridge electricity of described straight-flow system main frame
Resistance；
If described alternating current component value I ＞ Io, then judge have AC signal to seal in described straight-flow system；If
Described alternating current component value I≤Io, then judge to seal in described straight-flow system without AC signal.
Preferably, the described alternating voltage alarming value Ux that sets is as 10-15V.
Preferably, the precision≤0.05mA of described alternating current component value I.
Preferably, described main frame also includes that one exceedes described voltage threshold Uo at described ac voltage U
Time send the warning circuit of alarm signal.
Enforcement the invention has the beneficial effects as follows: the present invention judges that AC signal seals in the detection of straight-flow system
Method and system can determine whether out whether have AC signal to seal in straight-flow system, it is simple to finds AC signal in time
Seal in the situation of straight-flow system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the equivalent circuit diagram during AC signal seals in DC power system in prior art；
Fig. 2 is the DC detecting principle equivalent circuit diagram of DC power system in prior art；
Fig. 3 is to judge the detecting system module that AC signal seals in straight-flow system in some embodiments of the invention
Schematic diagram；
Fig. 4 is current sensing means and the logical schematic of main frame in Fig. 3；
Fig. 5 is to judge the detection method flow process that AC signal seals in straight-flow system in some embodiments of the invention
Schematic diagram.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and effect are more clearly understood from, now compare accompanying drawing
Describe the detailed description of the invention of the present invention in detail.
Fig. 3 shows the detection system judging in some embodiments of the invention that AC signal seals in straight-flow system
System, can the extensively power plant of the industry such as power application, oil, chemical industry, railway, coal and transformer station,
And the communications field etc..This detecting system is for judging whether sealed in AC system in straight-flow system
AC signal, exchange seals in mode and includes being directly accessed and be coupled into electric capacity.Wherein, table is directly scurried in exchange
Show that control bus KM insulation against ground resistance drops at the end the most accordingly；Ac capacitor is coupled into expression control bus KM
Insulation against ground resistance does not produce change.
This detecting system include control bus KM, main frame 20, several feed out load 30 and several electric current inspection
Surveying device 10, wherein, main frame 20 is connected on control bus KM, several feed out load and 30 is connected in parallel on
On control bus KM, several current sensing means 10 electrically connect with several load 30 one_to_one corresponding that feed out,
Thus feed out load 30 detection alternating current component value I to each, and alternating current component value I is fed back
To main frame 20.
Control bus KM is used for providing power supply, and it has anode KM+ and negative terminal KM-.
Main frame 20 is connected on control bus KM thus obtains power supply, and specifically, one end is connected to anode
KM+, the other end connects negative terminal KM-.Shown in Fig. 4, main frame 20 includes Acquisition Circuit 21, ratio
Relatively circuit 22, routing inspection circuit 23 and warning circuit 24.
Wherein, Acquisition Circuit 21 is connected with control bus KM, submits for acquisition controlling bus KM
Stream magnitude of voltage U.Specifically, one end is connected to anode KM+, and the other end connects negative terminal KM-.As choosing
Selecting, Acquisition Circuit 21 also detects the insulating resistance value of control bus KM.
Comparison circuit 22 is connected with Acquisition Circuit 21, for by ac voltage U and a voltage threshold
Uo compares and exports comparative result.In certain embodiments, it is alternatively that, main frame 20 also can wrap
Including a warning circuit 24, it is connected with comparison circuit 22.When comparison circuit 22 compares alternating voltage
When value U exceedes voltage threshold Uo, warning circuit 24 sends alarm signal.As selection, warning circuit
The type of alarm of 24 can be multiple, such as buzzing, audio alert, vibration alarming etc..As selection,
Warning circuit 24 can arrange and can also be not provided with.
Further, comparison circuit 22 is additionally operable to compare alternating current component value I and a current threshold Io
And export judged result.Specifically, current threshold Io is calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the balance bridge resistance of straight-flow system main frame 20
Value.If alternating current component value I ＞ Io, then judge have AC signal to seal in straight-flow system；If alternating current
Component value I≤Io, then judge to seal in straight-flow system without AC signal.As selection, set alternating voltage report
Alert value Ux is 10-15V.Preferably, alternating voltage alarming value Ux is set as 12V.In some embodiments
In, when Ux be 12V, Rb be 30K time, Io=12/30000=0.4mA；In certain embodiments, when
Ux is 12V, Rb when being 60K, Io=12/60000=0.2mA；In certain embodiments, as Ux it is
When 10V, Rb are 60K, Io=10/30000=0.167mA.
Routing inspection circuit 23 is connected with comparison circuit 22, is used for according to comparative result optionally to each
Current sensing means 10 sends patrols and examines signal so that corresponding is fed out by each current sensing means 10
Load 30 carries out the detection of alternating current component value I.
As selection, Acquisition Circuit 21, comparison circuit 22, routing inspection circuit 23 and warning circuit 24 can be each
From the circuit realiration corresponding function being respectively made up of electronic devices and components for hardware circuit form, i.e. three
Hardware circuit.As selection, Acquisition Circuit 21, comparison circuit 22, routing inspection circuit 23 and warning circuit
24 can also be integrated on a chip, realize corresponding function by software mode.
Feeding out load 30 to be connected on control bus KM thus obtain power supply, specifically, one end is connected to
Anode KM+, the other end connects negative terminal KM-.Feed out load 30 quantity be several, several feed out negative
Carry between 30 parallel with one another on control bus KM.
Current sensing means 10 electrically connects to carry out alternating current component value I with feeding out load 30 one_to_one corresponding
Detection, and alternating current component value I detected is fed back to main frame 20.Preferably, current detecting dress
Put 10 to be connected with main frame 20 by RS485 or RS232.Current sensing means 10 includes magnet ring wire
Circle 11, discharge circuit 12 and sample circuit 13.
Wherein, magnetic ring coil 11 feeds out load for the signal of patrolling and examining sent according to main frame 20 to corresponding
30 carry out alternating current signal detection, and the wire of electric current to be detected is through magnetic ring coil 11.Preferably, magnet ring
Coil 11 is non-contact detection, and Cleaning Principle is flux of magnetic induction principle, can be straight by magnetic ring coil 11
Connecing and induce relevant alternating current, be i.e. transformer function, this function is for exchanging small electric current.
Discharge circuit 12 is connected with magnetic ring coil 11, for exchange letter magnetic ring coil 11 detected
Number it is amplified.
Sample circuit 13 is connected with discharge circuit 12, the AC signal analog digital conversion after amplifying
For alternating current component value I and export to main frame 20.Preferably, the precision of alternating current component value I≤
0.05mA。
Hardware circuit form can be respectively as selection, discharge circuit 12 and sample circuit 13, i.e. the two
It is respectively the hardware circuit of the circuit realiration corresponding function being made up of electronic devices and components.As selection, amplifier
Circuit 12 and sample circuit 13 can also be integrated on a chip, realize corresponding merit by software mode
Energy.
Below in conjunction with some embodiments judging, AC signal seals in the detection method of straight-flow system to the present invention
Some embodiments judging, the operation principle of the detecting system that AC signal seals in straight-flow system illustrates.
In conjunction with shown in Fig. 3 to Fig. 5, it is judged that AC signal seals in the detection method of straight-flow system and includes as follows
Step:
In step S1, first Acquisition Circuit 21 connects anode KM+ and KM-of control bus respectively, from
And gather the ac voltage U at control bus KM two ends in straight-flow system, and outwards export this alternating current
Pressure value U.As selection, Acquisition Circuit 21 can Real-time Collection, it is possible to according to certain frequency timing acquiring.
In step S2, comparison circuit 22 is connected with Acquisition Circuit 21 and obtains from Acquisition Circuit 21 and hands over
Stream magnitude of voltage U, comparison circuit 22 judge ac voltage U whether more than a voltage threshold Uo, if so,
Then perform step S3, if it is not, return step S1.As in selection, this step, if in some embodiments
Ac voltage U exceedes voltage threshold Uo, the most also sends alarm signal.
In step S3, compare ac voltage U exceed voltage threshold Uo's when comparison circuit 22 is sentenced
After comparative result, comparative result being sent to routing inspection circuit 23, routing inspection circuit 23 is according to this comparative result pair
Each current sensing means 10 sends patrols and examines signal, thus starts branch road alternating current and patrol and examine so that each
Current sensing means 10 carries out the detection of alternating current component value I to the corresponding load 30 that feeds out.Magnet ring wire
The signal of patrolling and examining that circle 11 sends according to main frame 20 feeds out load 30 carry out alternating current signal detection to corresponding,
The AC signal that magnetic ring coil 11 detects is amplified by discharge circuit 12, and sample circuit 13 will amplify
After AC signal analog digital conversion be alternating current component value I and export to comparison circuit 22.Feed out load
30 is several, and is all connected in parallel on control bus KM.Preferably, the precision of alternating current component value I
≤0.05mA。
In step S4, comparison circuit 22 judges that each alternating current component value I fed out in load 30 is
No more than a current threshold Io and export judged result: the most then to judge have AC signal to seal in direct current system
System；If it is not, then judge not seal in.In certain embodiments, comparison circuit 22 is also connected to a display
Device, will determine that result sends to display device, and display device can will determine that result passes through picture, sound
Show etc. form.
Preferably, in step S4, current threshold Io is calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the balance bridge resistance of straight-flow system main frame 20
Value.If alternating current component value I ＞ Io, then judge have AC signal to seal in straight-flow system；If alternating current
Component value I≤Io, then judge to seal in straight-flow system without AC signal.As selection, set alternating voltage report
Alert value Ux is 10-15V.Preferably, alternating voltage alarming value Ux is set as 12V.In some embodiments
In, when Ux be 12V, Rb be 30K time, Io=12/30000=0.4mA；In certain embodiments, when
Ux is 12V, Rb when being 60K, Io=12/60000=0.2mA；In certain embodiments, as Ux it is
When 10V, Rb are 60K, Io=10/30000=0.167mA.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to
Above-described embodiment, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.Should
When pointing out, for those skilled in the art, without departing from the principles of the present invention
Several improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. one kind judges that AC signal seals in the detection method of straight-flow system, it is characterised in that include
Following steps:
S1: gather the ac voltage U of control bus (KM) in straight-flow system；
S2: judge that described ac voltage U whether more than a voltage threshold Uo, the most then performs step
Rapid S3, if it is not, return described step S1；
S3: each current sensing means (10) is sent and patrols and examines signal so that each described current detecting
Device (10) feeds out load (30) carry out the detection of alternating current component value I to corresponding, described in feed out
Load (30) is several, and is all connected in parallel on described control bus (KM)；
S4: judge each described in feed out alternating current component value I in load (30) whether more than an electricity
Stream threshold value Io, the most then judge have AC signal to seal in described straight-flow system；If it is not, then judge not go here and there
Enter.
Detection method the most according to claim 1, it is characterised in that in described step S4,
Described current threshold Io is calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the flat of described straight-flow system main frame (20)
Weighing apparatus resistor bridge value；
If described alternating current component value I ＞ Io, then judge have AC signal to seal in described straight-flow system；If
Described alternating current component value I≤Io, then judge to seal in described straight-flow system without AC signal.
Detection method the most according to claim 2, it is characterised in that described setting alternating voltage
Alarming value Ux is 10-15V.
Detection method the most according to claim 2, it is characterised in that described alternating current component
Precision≤the 0.05mA of value I.
5. according to the detection method described in any one of Claims 1-4, it is characterised in that described step
In rapid S2, if described ac voltage U exceedes described voltage threshold Uo, the most also send alarm signal.
6. one kind judges that AC signal seals in the detecting system of straight-flow system, it is characterised in that include
Control bus (KM) and be connected to the main frame (20) on described control bus (KM), several parallel connection
Feeding out load (30) and feeding out load (30) described in each respectively on described control bus (KM)
One_to_one corresponding electrical connection is to carry out the detection of alternating current component value I and by alternating current component value I of detection
Feed back to the current sensing means (10) of described main frame (20)；
Wherein, described current sensing means (10) including:
Signal of patrolling and examining for sending according to described main frame (20) feeds out load (30) described in corresponding
Carry out the magnetic ring coil (11) of alternating current signal detection, and the wire of electric current to be detected is through described magnet ring wire
Circle (11)；
The discharge circuit being connected with described magnetic ring coil (11), described AC signal being amplified
(12)；
Be connected with described discharge circuit (12), for will amplify after described AC signal analog digital conversion
For described alternating current component value I the sample circuit (13) that exports；
Described main frame (20) including:
It is connected with described control bus (KM), exchanges on described control bus (KM) for gathering
The Acquisition Circuit (21) of magnitude of voltage U；
It is connected with described Acquisition Circuit (21), for by described ac voltage U and a voltage threshold
Uo compares and exports comparative result and for by described alternating current component value I and a current threshold
Io compares and exports the comparison circuit (22) of judged result；
Be connected with described comparison circuit (22), according to described comparative result optionally to each described
Current sensing means (10) is patrolled and examined signal, is made each described current sensing means (10) described in sending
To the routing inspection circuit (23) feeding out load (30) described in corresponding and carrying out the detection of alternating current component value I.
Detecting system the most according to claim 6, it is characterised in that described current threshold Io
Calculated by formula (1):
Wherein, Ux is for setting alternating voltage alarming value, and Rb is the flat of described straight-flow system main frame (20)
Weighing apparatus resistor bridge value；
If described alternating current component value I ＞ Io, then judge have AC signal to seal in described straight-flow system；If
Described alternating current component value I≤Io, then judge to seal in described straight-flow system without AC signal.
Detecting system the most according to claim 7, it is characterised in that described setting alternating voltage
Alarming value Ux is 10-15V.
Detecting system the most according to claim 7, it is characterised in that described alternating current component
Precision≤the 0.05mA of value I.
10. according to the detecting system described in any one of claim 6 to 9, it is characterised in that described master
Machine (20) also includes that one sends alarm signal when described ac voltage U exceedes described voltage threshold Uo
Number warning circuit (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510074029.9A CN105988046A (en) | 2015-02-12 | 2015-02-12 | Detection method and detection system for judging alternating current signals being in series connection with direct current system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510074029.9A CN105988046A (en) | 2015-02-12 | 2015-02-12 | Detection method and detection system for judging alternating current signals being in series connection with direct current system |
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Cited By (1)
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| CN112666413A (en) * | 2020-12-16 | 2021-04-16 | 广东电网有限责任公司 | Detection device and method for alternating current series connection into direct current system |
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Application publication date: 20161005 |