CN107508308A - Converter station internal grounding device and direct-current transmission system - Google Patents
Converter station internal grounding device and direct-current transmission system Download PDFInfo
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- CN107508308A CN107508308A CN201710907048.4A CN201710907048A CN107508308A CN 107508308 A CN107508308 A CN 107508308A CN 201710907048 A CN201710907048 A CN 201710907048A CN 107508308 A CN107508308 A CN 107508308A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 95
- 238000006243 chemical reaction Methods 0.000 claims description 125
- 238000000034 method Methods 0.000 abstract description 5
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 20
- 230000007935 neutral effect Effects 0.000 description 16
- 230000008859 change Effects 0.000 description 9
- 230000005283 ground state Effects 0.000 description 9
- 230000005404 monopole Effects 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 4
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- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses an earthing device in a converter station and a direct-current transmission system, relates to the field of high-voltage direct-current transmission, and aims to solve the problem that when a common earthing electrode has a large earthing current, the current passing through a loop of the earthing device in the converter station is overlarge in the process of converting the running state of the direct-current transmission system in which the converter station is connected with the common earthing electrode. The invention discloses an earthing device in a converter station, which comprises an earthing switch, a first switch and a current-limiting resistor, wherein one side of the earthing switch is used for being connected with an earthing electrode lead wire of the converter station, the other side of the earthing switch is connected with one side of the first switch, the other side of the first switch is connected with an earthing body in the converter station, and the current-limiting resistor is connected with the first switch in parallel. The invention can be used in a direct current transmission system adopting a common grounding electrode.
Description
Technical field
The present invention relates to earthing or grounding means and direct current transportation in technical field of HVDC transmission, more particularly to a kind of current conversion station
System.
Background technology
D.C. high voltage transmission refer to power transmission network realized in a manner of direct current electric energy transmit, D.C. high voltage transmission have warp
Many advantages, such as Ji property is good, without stationary problem, it is widely used in power transmission engineering.At present, multiple DC transmission systems it
Between more by the way of One Common Earthing Electrode, the problem of can so alleviating earthing pole addressing difficulty, while also reduce construction investment.
However, One Common Earthing Electrode is easy to produce certain influence to the transfer process of wherein DC transmission system running status, such as
In two DC transmission systems, when a DC transmission system is in monopole the earth or bipolar off-center operation, in addition one
When individual DC transmission system greatly turn metallic state operation, the earth current of One Common Earthing Electrode can be defeated to another direct current
The conversion of electric system running status affects.Thus, in multiple DC transmission systems, how to be connect to reduce to share
Earth polar ensures DC transmission system even running, it has also become urgently solve in the industry to the influence caused by running state conversion each other
Certainly the problem of.
Existing a kind of DC transmission system, as shown in figure 1, including the first sub- 01 and second sub- direct current of DC transmission system
Transmission system 02, the receiving end of two sub- DC transmission systems use One Common Earthing Electrode 03, the first sub- DC transmission system 01 and
The sending end and receiving end of two sub- DC transmission systems 02 include a current conversion station, and it is big that the first sub- DC transmission system 01 is in monopole
Ground running status, the second sub- DC transmission system 02 can carry out monopole the earth and the monopole metal method of operation is mutually changed.Its
In, the current conversion station of the first sub- sending end of DC transmission system 01 and receiving end is current conversion station 011a, current conversion station 011b respectively；Second son is straight
The current conversion station for flowing the sending end of transmission system 02 and receiving end is current conversion station 021a, current conversion station 021b respectively.Current conversion station 021b station is inscribed
The loop of ground device 06 is provided with earthed switch (not shown), and the side of earthed switch is connected with earthing pole lead 04,
Opposite side is connected with grounded screen in current conversion station 021b station.
When the second sub- DC transmission system 02 is in the operation of ground return circuit state, earthing pole lead on-off switch is (in figure
It is not shown, it is arranged in One Common Earthing Electrode 03 and current conversion station 021b station on the earthing pole lead 04 between earthing or grounding means 06,
It is mainly used in break-make earthing pole lead 04) close a floodgate, the metallic return 05 between current conversion station 021a, current conversion station 021b disconnects, and is grounded
Switch is in separating brake, and the earthing pole 07 between such One Common Earthing Electrode 03 and current conversion station 021a forms ground return circuit；In the second son
When DC transmission system 02 carries out greatly turning metal running state conversion, earthed switch, earthing pole lead on-off switch divide-shut brake
Sequentially it is：Earthed switch first closes a floodgate connects the inscribed earth mat that arrives at a station by neutral bus, and then earthing pole lead on-off switch separating brake breaks
Open One Common Earthing Electrode 03；When the second sub- DC transmission system 02 is in the operation of metallic(return) circuit state, earthing pole lead break-make is opened
Pass is in separating brake, and the metallic return 05 between current conversion station 021a, current conversion station 021b is connected, and earthed switch closes a floodgate, and (purpose is by
Sexupara line is connected in station in grounded screen, there is provided clamper point), metal is formed between such current conversion station 021a, current conversion station 021b and is returned
Road；When the second sub- DC transmission system 02 enters row metal and turns the earth running state conversion, earthed switch, earthing pole lead break-make
Switching divide-shut brake order is：Earthing pole lead on-off switch, which first closes a floodgate, connects One Common Earthing Electrode 03, then earthed switch separating brake again
Neutral bus and grounded screen in station are disconnected.
However, carrying out that the earth turns metal or metal turns to deposit in the earth transfer process in the second sub- DC transmission system 02
In earthed switch and earthing pole lead on-off switch simultaneously in the state closed a floodgate, because the first sub- DC transmission system 01 is in
Monopole the earth running status, then can have earth current at One Common Earthing Electrode 03, when earthed switch and earthing pole lead break-make
Switch is simultaneously when being in "on" position, the earth current at One Common Earthing Electrode 03 can grounded pole lead 04, earthing pole lead lead to
Disconnect pass, earthed switch is diverted in current conversion station 021b station in grounded screen.And the electric current transfer ability that earthed switch possesses has
Limit, and earthed switch does not have arc extinguishing ability, thus earthed switch does not possess the ability of the disjunction larger DC current, when altogether
The electric current in current conversion station 021b station in grounded screen is diverted to the earth current of earthing pole 03 and exceedes earthed switch transfer ability
When, earthed switch may can not carry out sub-switching operation due to overcurrent protection, or force separating brake unsuccessful, or be damaged during separating brake
Switch, it is possible to causing the earth current at One Common Earthing Electrode 03 to be persistently diverted to grounded screen in current conversion station 021b station
In, make in current conversion station 021b station that electric current is excessive on the loop of earthing or grounding means 06, in the station for so not only causing current conversion station 021b
Grounded screen excessively stream, influences the normal work of the equipment such as transformer in current conversion station 021b, and also results in the second sub- DC power transmission system
System 02 can not carry out the normal conversion of the earth and metallic state.
The content of the invention
Embodiments of the invention provide earthing or grounding means and DC transmission system in a kind of current conversion station, can solve the problem that and are connect shared
When earth polar has larger earth current, the DC transmission system of the current conversion station that is connected with One Common Earthing Electrode where it is run
During state changes, the problem of electric current passed through in its station on the loop of earthing or grounding means is excessive.
To reach above-mentioned purpose, on the one hand, the embodiment provides earthing or grounding means in a kind of current conversion station, including connect
Ground switch, first switch and current-limiting resistance, the side of the earthed switch are used to be connected with the earthing pole lead of current conversion station,
Opposite side is connected with the side of the first switch, and the opposite side of the first switch connects with the grounding body in the current conversion station
Connect, the current-limiting resistance is in parallel with the first switch.
Earthing or grounding means in current conversion station provided in an embodiment of the present invention, due to current-limiting resistance be it is in parallel with first switch after with connecing
Ground switch series connection, then the DC transmission system in the current conversion station where earthing or grounding means enters row metal and turns the earth or turn greatly
Metal, and earthing pole lead connection be One Common Earthing Electrode when, when the switch and earthed switch for break-make earthing pole lead
When being in "on" position, if first switch separating brake, then current-limiting resistance can enters ground state, such current-limiting resistance
It can limit and electric current in current conversion station on earthing or grounding means is flowed at One Common Earthing Electrode, connecing in current conversion station is flowed into so as to reduce
Electric current on ground body, the electric current in such current conversion station on the loop of earthing or grounding means be just not easy beyond earthed switch breaking capacity and
Separating brake can not be carried out by starting overcurrent protection, or separating brake is unsuccessful, so as to can ensure that earthed switch in current conversion station etc. just
Normal divide-shut brake, so can not only ensure that the DC transmission system is normally carried out running state conversion, but also can avoid compared with
The super safety margin of corrosion heating caused by the grounding body that big electric current is continued to flow into station, step voltage are permitted more than human-body safety
Perhaps it is worth, the equipment such as transformer is influenceed a series of harm such as cisco unity malfunction by earth current in current conversion station.
On the other hand, the embodiment of the present invention additionally provides a kind of DC transmission system, including more sub- DC transmission systems,
The receiving end or sending end of multiple sub- DC transmission systems use One Common Earthing Electrode, and each sub- DC transmission system is sent
End and receiving end include at least one current conversion station, in multiple current conversion stations using the One Common Earthing Electrode, at least one
Earthing or grounding means in the current conversion station described in above-described embodiment is connected with the earthing pole lead of the individual current conversion station, the direct current is defeated
Electric system also includes second switch, and the second switch is arranged on the earthing pole lead, and the one of the second switch
Side is connected with the One Common Earthing Electrode, and opposite side is connected with tie point, and the tie point is the earthing pole lead and institute
The tie point of earthing or grounding means in the current conversion station stated.
DC transmission system provided in an embodiment of the present invention, due to using One Common Earthing Electrode multiple current conversion stations in, extremely
Earthing or grounding means in the current conversion station described in any of the above-described embodiment is connected with the earthing pole lead of a rare current conversion station, then
In more sub- DC transmission systems, monopole the earth or bipolar uneven fortune are in when wherein there is a sub- DC transmission system
Row state, there is a sub- DC transmission system to enter row metal in addition and turn the earth or turn the transformation of metal running status greatly, when entering
When second switch and earthed switch are in "on" position in the sub- DC transmission system of row running status transformation, if by first
Switch separating brake, then current-limiting resistance can enters ground state, and such current-limiting resistance can limit to flow at One Common Earthing Electrode
Enter into current conversion station the electric current on the loop of earthing or grounding means, so as to reduce the electric current flowed on the grounding body in current conversion station, so
Electric current in current conversion station on the loop of earthing or grounding means is just not easy to make overcurrent protection start not beyond earthed switch breaking capacity
It can carry out separating brake, or separating brake is unsuccessful, so as to can ensure that the normal divide-shut brake such as the earthed switch in current conversion station, so not only
It can ensure that the DC transmission system is normally carried out running state conversion, but also larger electric current can be avoided to continue to flow into station
Corrosion caused by interior grounding body generates heat super safety margin, step voltage more than transformation in human-body safety permissible value, current conversion station
The equipment such as device are influenceed a series of harm such as cisco unity malfunction by earth current.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of existing DC transmission system (arrow in figure is the flow direction of electric current)；
Fig. 2 is the schematic diagram of DC transmission system provided in an embodiment of the present invention (arrow in figure is the flow direction of electric current)；
Fig. 3 is in the embodiment of the present invention after current-limiting resistance ground connection, and the sending end current conversion station of the second sub- DC transmission system is neutral
The change of voltage on bus；
Fig. 4 is in the embodiment of the present invention after current-limiting resistance ground connection, and the receiving end current conversion station of the second sub- DC transmission system is neutral
The change of voltage on bus.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Term " first ", " second " be only used for describe purpose, and it is not intended that instruction or imply relative importance or
The implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed or imply
Ground includes one or more this feature.In the description of the invention, unless otherwise indicated, " multiple " be meant that two or
Two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
Be mechanically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be the company of two element internals
It is logical.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
On the one hand, the embodiments of the invention provide earthing or grounding means in a kind of current conversion station, as shown in Fig. 2 the current conversion station is inscribed
Ground device, including earthed switch 1, first switch 2 and current-limiting resistance 3, the side of earthed switch 1 are used for the ground connection with current conversion station
Pole lead is connected, and opposite side is connected with the side of first switch 2, the ground connection in the opposite side and current conversion station of first switch 2
Body 5 is connected, and current-limiting resistance 3 is in parallel with first switch 2.Wherein, the grounding body 5 in current conversion station can be artificial earth electrode, example
Such as grounded screen.
When DC transmission system (such as the second sub- direct current transportation shown in Fig. 2 where earthing or grounding means in the current conversion station
System 300) when being in the earth running status, switch (such as the second switch shown in Fig. 2 for break-make earthing pole lead
600) it is in "on" position, earthed switch 1, first switch 2 are in gate-dividing state, metallic return (such as the metal shown in Fig. 2
Loop line 700) it is off, at this moment One Common Earthing Electrode (such as One Common Earthing Electrode 400 shown in Fig. 2) and direct current transportation
In system ground return circuit is formed between the earthing pole (such as in Fig. 2 shown in label n) of another current conversion station；When the DC power transmission system
When system carries out greatly turning metal, earthed switch 1 closes a floodgate first, and current-limiting resistance 3 enters ground state, is grounded with limiting in current conversion station
Electric current on the loop of device, then, metallic return are connected, and the switch separating brake for break-make earthing pole lead, which disconnects, shares ground connection
Pole, then the 2-in-1 lock of first switch, current-limiting resistance 3 exit ground state, the DC transmission system enter metallic return operation shape
State, clamper point outside the current conversion station by being transferred in station；
When the DC transmission system is in metal running status, the switch for break-make earthing pole lead is in separating brake shape
State, earthed switch 1, first switch 2 are in "on" position, and metallic return is in an ON state；When the DC transmission system is carried out
When metal turns the earth, the separating brake of first switch 2, current-limiting resistance 3 enter ground state first, are subsequently used for break-make earthing pole lead
Switch, which closes a floodgate, connects One Common Earthing Electrode, and metallic return disconnects, and is then turned off earthed switch 1, and current-limiting resistance 3 exits ground state,
The DC transmission system enters ground return circuit running status, and clamper point is outer by being transferred to station in the current conversion station.
It should be noted that：During the DC transmission system enters row metal turn the earth or turns metal greatly, its
The disconnection of metallic return is switched to control with connection by others.
Earthing or grounding means in current conversion station provided in an embodiment of the present invention, due to current-limiting resistance 3 be it is in parallel with first switch 2 after with
Earthed switch 1 is connected, then the DC transmission system in the current conversion station where earthing or grounding means enters row metal and turns the earth or big
Ground turns metal, and the connection of earthing pole lead be One Common Earthing Electrode when, when the switch for break-make earthing pole lead and ground connection
Switch 1 is when being in "on" position, if by the separating brake of first switch 2, then and the can of current-limiting resistance 3 enters ground state, this
Sample current-limiting resistance 3 can limit the electric current being flowed at One Common Earthing Electrode in current conversion station on the loop of earthing or grounding means, so as to subtract
The electric current on grounding body 5 in small inflow current conversion station, the electric current in such current conversion station on the loop of earthing or grounding means are just not easy to surpass
Go out the breaking capacity of earthed switch 1 and separating brake can not be carried out by starting overcurrent protection, or separating brake is unsuccessful, is changed so as to can ensure that
The normal divide-shut brake of the grade of earthed switch 1 in stream station, so can not only ensure that the DC transmission system is normally carried out running status
Conversion, but also can avoid the corrosion caused by the grounding body 5 that larger electric current continued to flow into station generate heat super safety margin,
Step voltage is influenceed cisco unity malfunction etc. more than equipment such as transformers in human-body safety permissible value, current conversion station by earth current
A series of harm.
In addition, earthing or grounding means in current conversion station provided in an embodiment of the present invention, is to limit the change of current by increasing current-limiting resistance 3
Electric current in standing on the loop of earthing or grounding means, without high-power electric and electronic switching device, and auxiliary equipment need not be increased
Auxiliary channel is formed, without the switch of increase or transformation with DC current transfer capability, it is only necessary to which existing sequence is patrolled
Collect and combed, changed, do not influence method of operation differentiation and main relaying configuration, can so greatly reduce floor space and subtract
Few construction investment.
In current conversion station provided in an embodiment of the present invention in earthing or grounding means, the type of earthed switch 1 is not unique, for example is grounded
Switch 1 can be common earthed switch 1, in addition, earthed switch 1 can also be high-speed grounding switch (High Speed
Grounding Switches abbreviation HSGS).But compared with common earthed switch 1, high-speed grounding switch can be used as normally transporting
The protection of the neutral conductor over-voltage fault such as earthing pole open fault during row, so as to be more beneficial for ensureing the stable fortune of DC transmission system
OK.
In current conversion station provided in an embodiment of the present invention in earthing or grounding means, the type of first switch 2 is not also unique, such as first
Switch 2 can be breaker, in addition, first switch 2 can also be disconnecting switch.But compared with breaker, disconnecting switch does not have
The structures such as the arc extinguishing in breaker, structure is simpler, and on the premise of requirement is met, first switch 2 uses disconnecting switch
Cost can be reduced, reduces investment.
Referring to Fig. 2, earthing or grounding means also includes neutral bus impacting electric capacity device 4 in current conversion station provided in an embodiment of the present invention,
One end of neutral bus impacting electric capacity device 4 is connected with neutral bus, and the other end is connected with the grounding body 5 in current conversion station, in
Sexupara line impacting electric capacity device 4 is also in series with inductance (not shown), in the mistake of earthed switch 1 and the on/off switch of first switch 2
Cheng Zhong, neutral bus impacting electric capacity device 4 and its inductance concatenated can play a part of oscillation circuit.
On the other hand, the embodiment of the present invention additionally provides a kind of DC transmission system, including more sub- DC transmission systems,
The receiving end or sending end of more individual sub- DC transmission systems use One Common Earthing Electrode, the sending end and receiving end of every sub- DC transmission system
Include at least one current conversion station, in multiple current conversion stations using One Common Earthing Electrode, the earthing pole of at least one current conversion station
Earthing or grounding means in the current conversion station described in any of the above-described embodiment is connected with lead, such as shown in Fig. 2, the figure show direct current
Transmission system includes two sub- DC transmission systems, and the receiving end of two sub- DC transmission systems uses One Common Earthing Electrode 400,
And sending end and receiving end include the situation of a current conversion station, and two sub- DC transmission systems are the first sub- DC power transmission system respectively
200 and second sub- DC transmission system 300 of system, the sending end and receiving end of the first sub- DC transmission system 200 correspond to current conversion station respectively
210A and current conversion station 210B, the sending end and receiving end of the second sub- DC transmission system 300 correspond to current conversion station 310A and current conversion station respectively
310B, the current conversion station 310A in the sub- DC transmission systems 300 of current conversion station 210B and second in the first sub- DC transmission system 200
Using One Common Earthing Electrode 400, the change of current described in any of the above-described embodiment is connected with current conversion station 310B earthing pole lead 500
Earthing or grounding means 100 in standing；As shown in Fig. 2 DC transmission system provided in an embodiment of the present invention also includes second switch 600, the
Two switches 600 are arranged on earthing pole lead 500, and be connected with One Common Earthing Electrode 400 (can for the side of second switch 600
To be to be directly connected to, can also be connected by miscellaneous equipment, specifically can be depending on actual conditions), opposite side and tie point O phases
Connection, tie point O be earthing pole lead 500 and current conversion station in earthing or grounding means 100 tie point.
DC transmission system provided in an embodiment of the present invention, due to using One Common Earthing Electrode 400 multiple current conversion stations in,
Earthing or grounding means in the current conversion station described in any of the above-described embodiment is connected with the earthing pole lead 500 of at least one current conversion station
100, then in more sub- DC transmission systems, when wherein there is a sub- DC transmission system (such as first shown in Fig. 2
Sub- DC transmission system 200) in monopole the earth or bipolar off-center operation state, there is a sub- DC transmission system in addition
Enter row metal to turn the earth or turn the transformation of metal running status greatly, when the sub- DC transmission system for carrying out running status transformation
Second switch 600 and earthed switch 1 are in "on" position in (such as second sub- DC transmission system 300 shown in Fig. 2)
When, if by the separating brake of first switch 2, then the can of current-limiting resistance 3 enters ground state, and such current-limiting resistance 3 can limit
The electric current on the loop of earthing or grounding means 100 in current conversion station is flowed at One Common Earthing Electrode 400, the current conversion station is flowed into so as to reduce
The electric current on grounding body 5 in (such as current conversion station 310B shown in Fig. 2), the loop of earthing or grounding means 100 in such current conversion station
On electric current be just not easy to start overcurrent protection beyond the breaking capacity of earthed switch 1 can not to carry out separating brake, or separating brake not into
Work(, so as to can ensure that the normal divide-shut brake of the grade of earthed switch 1 in current conversion station, it so can not only ensure the DC power transmission system
System is normally carried out running state conversion, but also larger electric current can be avoided to continue to flow into caused by the grounding body 5 in standing
The super safety margin of corrosion heating, step voltage are more than equipment such as transformers in human-body safety permissible value, current conversion station by earth current
A series of harm such as influence cisco unity malfunction.
In DC transmission system provided in an embodiment of the present invention, the type of second switch 600 is not also unique, for example second opens
It can be breaker to close 600, in addition, second switch 600 can also be disconnecting switch.But compared with breaker, disconnecting switch does not have
There are the structures such as the arc extinguishing in breaker, structure is simpler, and on the premise of requirement is met, second switch 600 is using isolation
Switch can reduce cost, reduce investment.
Referring to Fig. 3 and Fig. 4, to carry out the sub- DC transmission system of running status transformation (the shown in Fig. 2 shown in figure
Two sub- DC transmission systems 300) in, after current-limiting resistance 3 (resistance size is 300 Ω) enters ground state, the sub- direct current is defeated
The change of two current conversion station (current conversion station 310A and current conversion station 310B) neutral bus voltage, Fig. 3 show current conversion station in electric system
The change of 310A neutral bus voltages, Fig. 4 show the change of current conversion station 310B neutral bus voltages.Can be with from Fig. 3 and Fig. 4
Current conversion station 310A and current conversion station 310B are found out after 300 Ω current-limiting resistance 3 is grounded, neutral bus voltage on two current conversion stations
Change is 3kV, i.e., it is 3kV that current-limiting resistance 3, which is grounded current potential uplift scope on latter two current conversion station neutral bus,.It is possible thereby to see
Go out current-limiting resistance 3 ground connection substantially do not raise two current conversion stations neutral bus current potential, this ensure that the sub- direct current is defeated
In electric system on the neutral bus of current conversion station arrester safety, the design of current-limiting resistance 3 substantially conforms to the requirement of design.
More than, it is only embodiment of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (5)
1. earthing or grounding means in a kind of current conversion station, it is characterised in that described including earthed switch, first switch and current-limiting resistance
The side of earthed switch is used to be connected with the earthing pole lead of current conversion station, and opposite side is connected with the side of the first switch
Connect, the opposite side of the first switch is connected with the grounding body in the current conversion station, and the current-limiting resistance is opened with described first
Close in parallel.
2. earthing or grounding means in current conversion station according to claim 1, it is characterised in that the earthed switch is opened for hot on touchdown
Close.
3. earthing or grounding means in current conversion station according to claim 1 or 2, it is characterised in that the first switch is to keep apart
Close.
4. a kind of DC transmission system, it is characterised in that including more sub- DC transmission systems, multiple sub- DC power transmission systems
The receiving end or sending end of system use One Common Earthing Electrode,
The sending end and receiving end of each sub- DC transmission system include at least one current conversion station, are using the shared ground connection
In multiple current conversion stations of pole, it is connected with claims 1 to 3 and appoints on the earthing pole lead of at least one current conversion station
Earthing or grounding means in current conversion station described in one,
The DC transmission system also includes second switch, and the second switch is arranged on the earthing pole lead, and institute
The side for stating second switch is connected with the One Common Earthing Electrode, and opposite side is connected with tie point, and the tie point is described
The tie point of earthing pole lead and earthing or grounding means in the current conversion station.
5. DC transmission system according to claim 4, it is characterised in that the second switch is disconnecting switch.
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