CN107039958A - The protection system to earth and method of a kind of wind power plant box type transformer low-pressure system - Google Patents
The protection system to earth and method of a kind of wind power plant box type transformer low-pressure system Download PDFInfo
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- CN107039958A CN107039958A CN201710434070.1A CN201710434070A CN107039958A CN 107039958 A CN107039958 A CN 107039958A CN 201710434070 A CN201710434070 A CN 201710434070A CN 107039958 A CN107039958 A CN 107039958A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses a kind of protection system to earth of wind power plant box type transformer and method, the protection system to earth includes current acquisition module, amperometry module and breaker control module.Current acquisition module is mounted in the connection cable surface of box type transformer low-pressure side, for obtaining the split-phase electric current of box type transformer low-pressure side and being translated into secondary split-phase electric current；Amperometry module is used to receive secondary split-phase electric current, and trip signal is exported when secondary split-phase electric current is more than current setting；Breaker control module is used for the circuit breaker trip for receiving trip signal and controlling to be arranged between the box type transformer and Wind turbines.When earth fault occurs for the connection cable of box type transformer low-pressure side, the secondary split-phase electric current that current acquisition module is delivered to amperometry module is more than current setting, amperometry module exports trip signal, and breaker control module receives trip signal and makes the circuit breaker trip between box type transformer and Wind turbines.
Description
Technical field
The present invention relates to the relay protection field of wind power plant generating equipment, more particularly to a kind of wind power plant box type transformer are low
The protection system to earth and method of pressure system.
Background technology
In wind power plant, wind power generating set is used to the kinetic energy of wind being converted to electric energy, then is transmitted electric energy by transformer
Into supply network.At present, wind power plant generally uses the carton deformed formula of a machine one, i.e.,：Every wind power generating set is led in wind power plant
Cross matched box type transformer and be linked into collection electric line, collection electric line is summarized after some wind power generating set electric power simultaneously
Enter booster stations, be connected finally by the main transformer of wind power plant with supply network.
In the prior art, Wind turbines are electrically connected by connection cable with supporting box type transformer, and the two of connection cable
End sets a breaker respectively, is the grid-connected breaker of blower fan close to the breaker of Wind turbines, close to box type transformer low pressure
The breaker of side is low-voltage circuit breaker.Wherein, the master control system of Wind turbines and the TT＆C system of box type transformer are controlled respectively
The trip operation of the grid-connected breaker of blower fan and low-voltage circuit breaker.Because the supporting box type transformer of Wind turbines is universal in low-pressure side
System uses direct grounding way, cause case low pressure side system come true on earthed system, in addition Wind turbines master
The corresponding ground protection of the TT＆C system of control system and box type transformer configuration not yet in effect, when the low-pressure side one of box type transformer
When earth fault occurs in subsystem, ground protection purpose can only be reached by the electrical apparatus release driving trip operation of breaker itself.
But, the tripping function of the breaker of different model has larger difference：Some breakers electrical apparatus release of itself is not matched somebody with somebody
Ground protection is put, when earth fault occurs in the low-pressure side primary system of box type transformer, this breaker can not fast trip；
Some breakers electrical apparatus release of itself is configured with ground protection, when earth fault occurs in the low-pressure side primary system of box type transformer
When, this breaker can trip, still, and whether ground protection action is promptly and accurately decided by zero-sequence current, and zero sequence is electric
The collection of stream depends entirely on breaker itself, and this, which results in scene, is present because signal acquisition is inaccurate and fixed value adjusting tired
It is difficult and the problem of be forced to exit the protection.
In summary, when earth fault occurs in the connection cable between Wind turbines and box type transformer, due to box
The breaker of step down side do not possess generally ground protection function or its ground protection function definite value fail it is rationally whole
It is fixed so that breaker can not trip in time to be cut off failure and cause the accident of device damage to happen occasionally, and has had a strong impact on wind-powered electricity generation
The production safety of field.
The content of the invention
It is existing to solve the invention provides a kind of protection system to earth of wind power plant box type transformer low-pressure system and method
Have in technology, when earth fault occurs in the connection cable between Wind turbines and box type transformer, because box type transformer is low
The breaker of pressure side does not possess ground protection function generally or the definite value of its ground protection function fails rationally to adjust and cause
Breaker can not trip excision failure in time the problem of cause device damage.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical scheme：
First aspect according to embodiments of the present invention there is provided a kind of protection system to earth of wind power plant box type transformer,
Including current acquisition module, amperometry module and breaker control module, wherein：
The current acquisition module is mounted in box type transformer low-pressure side connection cable surface, for gathering the box change
The split-phase electric current of depressor low-pressure side, secondary split-phase electric current is converted into by the split-phase electric current got；
The amperometry module is used to receive the secondary split-phase electric current, when the secondary split-phase electric current is whole more than electric current
Trip signal is exported during definite value；
The breaker control module is used to receive the trip signal, and control is arranged on the box type transformer and wind-powered electricity generation
Circuit breaker trip between unit.
Further, the current acquisition module includes split-phase type current transformer, wherein：
The split-phase type current transformer is mounted in the box type transformer low-pressure side and is respectively connected cable surface, for obtaining
Take each split-phase electric current in carried connection cable.
Further, the amperometry module includes overcurrent relay and time-delay relay, wherein：
The coil terminals of the overcurrent relay are electrically connected with the secondary terminals of current acquisition module, for receiving described two
Secondary split-phase electric current, time delayed signal is exported when the secondary split-phase electric current is more than setting current value；
The coil terminals of the time-delay relay are electrically connected with the node terminal of the overcurrent relay, described for receiving
Time delayed signal and start-up study action, deferred action export trip signal after terminating.
Further, the overcurrent relay includes three split-phase overcurrent relays and a zero sequence overcurrent relay, its
In：
Secondary terminals of the coil terminals of three split-phase overcurrent relays respectively with the current acquisition module are electrically connected
Connect, be respectively used to the secondary split-phase electric current on phase line cable where receiving it, when the secondary split-phase electric current is more than split-phase
During current setting, split-phase time delayed signal is exported；
Connected respectively with the coil terminals of the zero sequence overcurrent relay after three split-phase overcurrent relays are in parallel company
Connect, the zero sequence overcurrent relay is used to the split-phase electric current in three split-phase overcurrent relays being superposed to zero-sequence current,
When the zero-sequence current is more than zero sequence current setting value, zero sequence time delayed signal is exported.
Further, the time-delay relay includes split-phase time-delay relay and zero sequence time-delay relay, wherein：
The coil terminals of the split-phase time-delay relay are electrically connected with the node terminal of the split-phase overcurrent relay, are used for
The split-phase time delayed signal is received, and starts split-phase deferred action, after split-phase deferred action, sequential trip signal is exported；
The coil terminals of the zero sequence time-delay relay are electrically connected with the node terminal of the zero sequence overcurrent relay, are used for
The zero sequence time delayed signal is received, and starts zero sequence deferred action, after zero sequence deferred action, zero sequence trip signal is exported.
Further, the breaker control module includes breaking coil, wherein：
The breaking coil is used to receive the trip signal, and make to be arranged on the Wind turbines and box type transformer it
Between circuit breaker trip.
Further, the breaker control module also includes auxiliary reclay, wherein：
The auxiliary reclay is used to receive the trip signal, and sends alarm signal.
Further, the breaker control module also includes split phase signal relay and zero sequence signal relay, wherein：
The coil terminals of the split phase signal relay are electrically connected with the node terminal of split-phase time-delay relay, for receiving
The sequential trip signal, and export sequential trip control signal；
The coil terminals of the zero sequence signal relay are electrically connected with the node terminal of zero sequence time-delay relay, for receiving
The zero sequence trip signal, and export zero sequence tripping operation control signal；
Coil terminals of the breaking coil respectively with the split phase signal relay and zero sequence signal relay are electrically connected,
For receiving the sequential trip control signal and zero sequence tripping operation control signal；
Node terminal of the auxiliary reclay respectively with the split phase signal relay and zero sequence signal relay is electrically connected
Connect, for receiving the sequential trip control signal and zero sequence tripping operation control signal, and send alarm signal.
Second aspect according to embodiments of the present invention there is provided a kind of earthing protecting method of wind power plant box type transformer,
Methods described includes：
The split-phase electric current in box step down side connection cable is gathered using split-phase type current transformer, and will be described
Split-phase electric current is converted to secondary split-phase electric current；
The secondary split-phase electric current is gathered using overcurrent relay, and judges the secondary split-phase electric current whether more than whole
Determine current value；
If the secondary split-phase current value is more than the setting current value, to breaker control module output tripping operation letter
Number；
The breaker control module is arranged on the box type transformer and Wind turbines according to trip signal control
Between circuit breaker trip.
From above technical scheme, a kind of ground protection system of wind power plant box type transformer provided in an embodiment of the present invention
System and method, protection system to earth include current acquisition module, amperometry module and breaker control module.Current acquisition mould
Block is mounted in the connection cable surface of box type transformer low-pressure side, for obtaining the split-phase electric current of box type transformer low-pressure side and inciting somebody to action
It is converted into secondary split-phase electric current；Amperometry module is connected with current acquisition block coupled in series, for receiving secondary split-phase electric current,
Trip signal is exported when secondary split-phase electric current is more than current setting；Breaker control module is electrically connected with amperometry module
Connect, for receiving trip signal and controlling to be arranged on circuit breaker trip between the box type transformer and Wind turbines.Work as case
When earth fault occurs for the connection cable of formula step down side, current acquisition module gets the two of box type transformer low-pressure side
Secondary split-phase electric current；Now secondary split-phase electric current is more than the current setting that amperometry module is set, the output of amperometry module
Trip signal；Breaker control module receives trip signal and jumps the breaker between box type transformer and Wind turbines
Lock.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
Can the limitation present invention.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that a kind of basic structure of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is a kind of each modular structure of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of amperometry mould of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention
The exchange secondary circuit graph of block；
Fig. 4 is a kind of amperometry mould of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention
The timing circuit figure of block；
Fig. 5 is a kind of breaker module of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention
Trip(ping) circuit figure；
Fig. 6 is a kind of breaker module of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention
Alarm circuit figure；
In Fig. 1-6, specific symbol is：
10- current acquisition modules, 11- split-phase type current transformers, 111- the first split-phase type current transformers, 112- second
Split-phase type current transformer, the split-phase type current transformers of 113- the 3rd, 20- amperometry modules, 21- overcurrent relays, 211-
Split-phase overcurrent relay, 2111- the first split-phase overcurrent relays, 2112- the second split-phase overcurrent relays, the split-phases of 2113- the 3rd
Overcurrent relay, 212- zero sequence overcurrent relays, 22- time-delay relays, 221- split-phase time-delay relays, 222- zero sequences delay after
Electrical equipment, 23- power positive ends switch, 24- power supply negative terminals switch, 30- breaker control modules, 31- breaking coils, 32- split-phases letter
Number relay, 33- zero sequence signal relays, 34- auxiliary reclays, 4- box type transformers, 41- low-voltage circuit breakers, 5- wind turbines
Group, the grid-connected breaker of 51- blower fans.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the present invention.
Referring to Fig. 1, be a kind of wind power plant box type transformer provided in an embodiment of the present invention protection system to earth it is basic
Structural representation.Wind turbines 5 are electrically connected by connection cable with supporting box type transformer 4, the two ends difference of connection cable
One breaker is set, is the grid-connected breaker 51 of blower fan close to the breaker of Wind turbines, close to box type transformer low-pressure side
Breaker is low-voltage circuit breaker 41.The protection system to earth of wind power plant box type transformer is mounted in connection cable surface, ground connection system
System includes current acquisition module 10, amperometry module 20 and breaker control module 30.
It is a kind of each mould of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 2
Block structure schematic diagram.The current acquisition module 10 of earthed system includes split-phase type current transformer 11, split-phase type current transformer
11 are mounted on the connection cable surface between the low-pressure side of box type transformer 4 and Wind turbines 5, and split-phase type current transformer 11 can
The split-phase current signal in the connection cable that it is carried is gathered, and the split-phase current signal got is converted into secondary split-phase
Current signal, secondary terminals output of the secondary split-phase electric current through split-phase type current transformer 11.
Amperometry module 20 includes overcurrent relay 21 and time-delay relay 22, and overcurrent relay 21, which has, adjusts work(
Can, when the current value for flowing through overcurrent relay 21 is more than the setting valve of setting, the normally opened node of overcurrent relay 21 is closed, and is opened
Dynamic time-delay relay 22；Time-delay relay 22 has delay function, after the startup of time-delay relay 22, trigger action, delay
After release, the output trip signal of amperometry module 20.Overcurrent relay 21 includes split-phase type overcurrent relay 211 and zero
Sequence overcurrent relay 212, time-delay relay 22 includes split-phase time-delay relay 221 and zero sequence time-delay relay 222.
Breaker control module 30 includes breaking coil 31, and breaking coil 31 is by split phase signal relay 32 and zero sequence signal
Relay 33 is controlled, and split phase signal relay 32 and zero sequence signal relay 33 can also control auxiliary reclay 34.Work as split-phase
Signal relay 32 or zero sequence signal relay 33 are received after trip signal, and one side breaking coil 31 starts low so as to control
Voltage breaker 41 and the grid-connected breaker 51 of blower fan trip, the connection cable between cut-out Wind turbines 5 and box type transformer 4, prevent
Only device damage；Another aspect auxiliary reclay 34, which starts, sends alarm signal, notifies cable maintenance personnel look into time to repair.But this
Inventive embodiments are not limited to this structure, and breaker control module 30 can not also include auxiliary reclay 34, cable maintenance
Personnel, by observing the working condition of low-voltage circuit breaker 41 and the grid-connected breaker 51 of blower fan, can also have found ground connection in customary inspection
The failure of system, and on-call maintenance.
It is a kind of electric current of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 3
The exchange secondary circuit graph of analysis module.Three split-phase type current transformers 11：First split-phase type current transformer 111, second
The split-phase type current transformer 113 of split-phase type current transformer 112 and the 3rd is equipped on the three-phase of the low-pressure side of box type transformer 4 respectively
Connection cable surface, the split-phase electric current of each phase for obtaining the low-pressure side of box type transformer 4 respectively, and split-phase electric current is converted into
Secondary split-phase electric current.Three split-phase overcurrent relays 211：First split-phase overcurrent relay 2111, the second split-phase overcurrent relay
2112 and the 3rd split-phase overcurrent relay 2113 electrically connected respectively with three split-phase type current transformers 11, for receiving secondary point
Phase current simultaneously judges whether secondary split-phase electric current is more than split-phase current setting.
Secondary terminals one end earth of three split-phase type current transformers 11, the other end respectively with three split-phase excessively streams
One end of the coil terminals of relay 211 is connected in series, and the other end of the coil terminals of three split-phase overcurrent relays 211 is in parallel
One end with the coil terminals of zero sequence overcurrent relay 212 is electrically connected afterwards, the coil terminals of zero sequence overcurrent relay 212 it is another
End ground connection.Three split-phase type current transformers 11 obtain the secondary split-phase current signal of connection cable three-phase, connection cable respectively
The secondary split-phase current signal of three-phase is pooled to zero sequence overcurrent relay 212 after flowing separately through three split-phase overcurrent relays 211,
It is superposed to zero sequence current signal.
It is a kind of electric current of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 4
The timing circuit figure of analysis module.First split-phase overcurrent relay 2111, the second split-phase overcurrent relay 2112 and the 3rd split-phase
Power positive end L+ is accessed after node terminal one end of overcurrent relay 2113 is in parallel, with split-phase time-delay relay after the other end is in parallel
One end electrical connection of 221 coil terminals, the other end access power supply negative terminal L- of the coil terminals of split-phase time-delay relay 221,
Form loop.One end access power positive end L+ of the node terminal of zero sequence overcurrent relay 212, the other end and zero sequence time-delay relay
One end electrical connection of 222 coil terminals, the other end access power supply negative terminal L- of zero sequence time-delay relay coil terminals, is formed back
Road.
When the secondary split-phase current signal that the first split-phase overcurrent relay 2111 is received is more than split-phase current setting,
The normally opened node of first split-phase overcurrent relay 2111 is closed and sends split-phase time delayed signal, and split-phase time-delay relay 221 is received
Start split-phase deferred action after to split-phase time delayed signal；Second split-phase overcurrent relay 2112 and the 3rd split-phase overcurrent relay
2113 course of work is identical with the first split-phase overcurrent relay 2111.The zero sequence received when zero sequence overcurrent relay 212
When current signal is more than zero sequence current setting value, the normally opened node of residual current relay 212 closes and sends zero sequence delay letter
Number, zero sequence time-delay relay 222 receives startup zero sequence deferred action after zero sequence time delayed signal
It is a kind of open circuit of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 5
The trip(ping) circuit figure of device module.One end access power positive end L+ of the node terminal of split-phase time-delay relay 221, the other end and split-phase
One end electrical connection of the coil terminals of signal relay 32, the other end and the breaking coil 31 of the coil terminals of split phase signal relay 32
One end electrical connection of coil terminals, the other end access power supply negative terminal L- of breaking coil 31, forms loop.Zero sequence time-delay relay
One end access power positive end L+ of 222 node terminals, the other end is electrically connected with one end of the coil terminals of zero sequence signal relay 33,
The other end of the coil terminals of zero sequence signal relay 33 is electrically connected with one end of the coil terminals of breaking coil 31, breaking coil 31
The other end accesses power supply negative terminal L-, forms loop.
It is a kind of open circuit of the protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 6
The alarm circuit figure of device module.Electricity is accessed in split phase signal relay 32, one end of the node terminal of zero sequence signal relay 33 jointly
Source anode L+, split phase signal relay 32, the other end of the node terminal of zero sequence signal relay 33 and the coil of auxiliary reclay 34
One end electrical connection of terminal, the other end access power supply negative terminal L- of the coil terminals of zero sequence signal relay 33, forms loop.
After the deferred action of split-phase time-delay relay 221 terminates, the normally opened node closure of split-phase time-delay relay 221 is simultaneously
Sequential trip signal is sent, split phase signal relay 32 receives sequential trip signal；When the delay of zero sequence time-delay relay 222 is moved
After work terminates, the normally opened node of zero sequence time-delay relay 222 closes and sends zero sequence trip signal, and zero sequence signal relay 33 connects
Receive zero sequence trip signal.When split phase signal relay 32 receives sequential trip signal or zero sequence signal relay 33 is received
After zero sequence trip signal, breaking coil 31, which starts, causes the grid-connected breaker 51 of blower fan and the open circuit of low-voltage circuit breaker 41, disconnects box
Transformer 4 and wind are with the connection cable between unit 5.
Split phase signal relay 32 is received after sequential trip signal, and the normally opened node closure of split phase signal relay 32 is simultaneously
Send sequential trip control signal；Zero sequence signal relay 33 is received after zero sequence trip signal, zero sequence signal relay 33
Normally opened node closes and sends zero sequence tripping operation control signal.Auxiliary reclay 34 receives sequential trip control signal or zero sequence
After the control signal that trips, auxiliary reclay 34 sends alarm signal, notifies cable maintenance personnel look into time to repair.
Based on above-mentioned protection system, the embodiment of the present invention additionally provides a kind of ground protection side of wind power plant box type transformer
Method, this method specifically includes following steps：
Step S110：The split-phase electricity in box step down side connection cable is gathered using split-phase type current transformer
Stream, and the split-phase electric current is converted into secondary split-phase electric current；
Step S120：The secondary split-phase electric current is gathered using overcurrent relay, and judges the secondary split-phase electric current
Whether setting current value is more than；
Step S130：If the secondary split-phase current value is more than the setting current value, defeated to breaker control module
Go out trip signal；
Step S140：The breaker control module according to the trip signal control be arranged on the box type transformer and
Circuit breaker trip between Wind turbines.
In summary, the protection system to earth and method of a kind of wind power plant box type transformer provided in an embodiment of the present invention,
Protection system to earth includes current acquisition module 10, amperometry module 20 and breaker control module 30.Current acquisition module
10 are mounted in the connection cable surface of the low-pressure side of box type transformer 4, for obtaining the split-phase electric current of the low-pressure side of box type transformer 4 simultaneously
It is translated into secondary split-phase electric current；Amperometry module 20 is connected in series with current acquisition module 10, for receiving secondary point
Phase current, trip signal is exported when secondary split-phase electric current is more than current setting；Breaker control module 30 and amperometry
Module 20 is electrically connected, for receiving trip signal and controlling to be arranged on open circuit between the box type transformer 4 and Wind turbines 5
Device trips.When earth fault occurs for the connection cable of the low-pressure side of box type transformer 4, current acquisition module 10 gets box change
The secondary split-phase electric current of the low-pressure side of depressor 4；Now secondary split-phase electric current is more than the current setting that amperometry module 20 is set,
Amperometry module 20 exports trip signal；Breaker control module 30 receives trip signal and makes box type transformer 4 and wind
Circuit breaker trip between group of motors 5.
Described above is only the embodiment of the present invention, is made skilled artisans appreciate that or realizing this hair
It is bright.A variety of modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
1. a kind of protection system to earth of wind power plant box type transformer, it is characterised in that the system includes current acquisition module
(10), amperometry module (20) and breaker control module (30), wherein：
The current acquisition module (10) is mounted in box type transformer (4) low-pressure side connection cable surface, for gathering the case
The split-phase electric current of formula transformer (4) low voltage side cable, secondary split-phase electric current is converted into by the split-phase electric current got；
The amperometry module (20) is used to receive the secondary split-phase electric current, when the secondary split-phase electric current is whole more than electric current
Trip signal is exported during definite value；
The breaker control module (30) is used to receive the trip signal, control be arranged on the box type transformer (4) and
Circuit breaker trip between Wind turbines (5).
2. system according to claim 1, it is characterised in that it is mutual that the current acquisition module (10) includes split-phase type electric current
Sensor (11), wherein：
The split-phase type current transformer (11) is mounted in the box type transformer low-pressure side and is respectively connected cable surface, for obtaining
Take the split-phase electric current in carried connection cable.
3. system according to claim 1, it is characterised in that the amperometry module (20) includes overcurrent relay
(21) and time-delay relay (22), wherein：
The coil terminals of the overcurrent relay (21) are electrically connected with the secondary terminals of current acquisition module (10), for receiving
Secondary split-phase electric current is stated, time delayed signal is exported when the secondary split-phase electric current is more than setting current value；
The coil terminals of the time-delay relay (22) are electrically connected with the node terminal of the overcurrent relay (21), for receiving
The time delayed signal and start-up study action, deferred action export trip signal after terminating.
4. system according to claim 3, it is characterised in that the overcurrent relay (21) include three split-phase excessively streams after
Electrical equipment (211) and a zero sequence overcurrent relay (212), wherein：
The secondary terminals of the coil terminals of three split-phase overcurrent relays (211) respectively with the current acquisition module (10)
Electrical connection, is respectively used to the secondary split-phase electric current on phase line cable where receiving it, when the secondary split-phase electric current is more than
During split-phase current setting, split-phase time delayed signal is exported；
Coil terminals after three split-phase overcurrent relays (211) are in parallel respectively with the zero sequence overcurrent relay (212)
It is connected in series, the zero sequence overcurrent relay (212) is used for the split-phase electric current in three split-phase overcurrent relays (211)
Zero-sequence current is superposed to, when the zero-sequence current is more than zero sequence current setting value, zero sequence time delayed signal is exported.
5. system according to claim 4, it is characterised in that the time-delay relay (22) includes split-phase time-delay relay
(221) and zero sequence time-delay relay (222), wherein：
The coil terminals of the split-phase time-delay relay (221) and the node terminal of the split-phase overcurrent relay (211) are electrically connected
Connect, for receiving the split-phase time delayed signal, and start split-phase deferred action, after split-phase deferred action, output sequential trip letter
Number；
The coil terminals of the zero sequence time-delay relay (222) and the node terminal of the zero sequence overcurrent relay (212) are electrically connected
Connect, for receiving the zero sequence time delayed signal, and start zero sequence deferred action, after zero sequence deferred action, output zero sequence tripping operation letter
Number.
6. system according to claim 5, it is characterised in that the breaker control module (30) includes breaking coil
(31), wherein：
The breaking coil (31) is used to receive the trip signal, and make to be arranged on the Wind turbines and box type transformer it
Between circuit breaker trip.
7. system according to claim 6, it is characterised in that the breaker control module (30) also includes middle relay
Device (34), wherein：
The auxiliary reclay (34) is used to receive the trip signal, and sends alarm signal.
8. system according to claim 7, it is characterised in that the breaker control module (30) also includes split phase signal
Relay (32) and zero sequence signal relay (33), wherein：
The coil terminals of the split phase signal relay (32) are electrically connected with the node terminal of split-phase time-delay relay (221), are used
In the reception sequential trip signal, and export sequential trip control signal；
The coil terminals of the zero sequence signal relay (33) are electrically connected with the node terminal of zero sequence time-delay relay (222), are used
In the reception zero sequence trip signal, and export zero sequence tripping operation control signal；
The breaking coil (31) respectively with the split phase signal relay (32) and the coil-end of zero sequence signal relay (33)
Son electrical connection, for receiving the sequential trip control signal and zero sequence tripping operation control signal；
The auxiliary reclay (34) respectively with the split phase signal relay (32) and the node of zero sequence signal relay (33)
Terminal is electrically connected, and for receiving the sequential trip control signal and zero sequence tripping operation control signal, and sends alarm signal.
9. a kind of earthing protecting method of wind power plant box type transformer, box using any wind power plant in claim 1-8
The protection system to earth of transformer, it is characterised in that methods described includes：
The split-phase electric current in box step down side connection cable is gathered using split-phase type current transformer, and by the split-phase
Electric current is converted to secondary split-phase electric current；
The secondary split-phase electric current is gathered using overcurrent relay, and judges whether the secondary split-phase electric current is more than and adjusts electricity
Flow valuve；
If the secondary split-phase current value is more than the setting current value, trip signal is exported to breaker control module；
The breaker control module is arranged between the box type transformer and Wind turbines according to trip signal control
Circuit breaker trip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710434070.1A CN107039958B (en) | 2017-06-09 | 2017-06-09 | A kind of protection system to earth and method of wind power plant box type transformer low-pressure system |
Applications Claiming Priority (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054785A (en) * | 2018-01-27 | 2018-05-18 | 丘健兴 | A kind of circuit for preventing wind power plant island-grid |
| CN110707659A (en) * | 2019-09-10 | 2020-01-17 | 中国船舶工业集团公司第七0八研究所 | Shore power cable overload protection system of marine shore power box |
| CN108288931B (en) * | 2017-12-29 | 2021-01-29 | 华润电力风能（阳江）有限公司 | Control method and control device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208801A (en) * | 2011-05-24 | 2011-10-05 | 内蒙古自治区电力科学研究院 | Operation method for safely applying line protection device to wind power station |
| CN102244380A (en) * | 2010-12-22 | 2011-11-16 | 保定天威集团有限公司 | Open-phase protection method and device of 35kV American box-type substation for wind power station |
| CN202076784U (en) * | 2011-06-28 | 2011-12-14 | 内蒙古电力勘测设计院 | Protective system for collecting line of wind power plant |
| CN105162096A (en) * | 2015-09-29 | 2015-12-16 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection device and protection method for current collecting line of wind power plant |
-
2017
- 2017-06-09 CN CN201710434070.1A patent/CN107039958B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244380A (en) * | 2010-12-22 | 2011-11-16 | 保定天威集团有限公司 | Open-phase protection method and device of 35kV American box-type substation for wind power station |
| CN102208801A (en) * | 2011-05-24 | 2011-10-05 | 内蒙古自治区电力科学研究院 | Operation method for safely applying line protection device to wind power station |
| CN202076784U (en) * | 2011-06-28 | 2011-12-14 | 内蒙古电力勘测设计院 | Protective system for collecting line of wind power plant |
| CN105162096A (en) * | 2015-09-29 | 2015-12-16 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection device and protection method for current collecting line of wind power plant |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108288931B (en) * | 2017-12-29 | 2021-01-29 | 华润电力风能（阳江）有限公司 | Control method and control device |
| CN108054785A (en) * | 2018-01-27 | 2018-05-18 | 丘健兴 | A kind of circuit for preventing wind power plant island-grid |
| CN110707659A (en) * | 2019-09-10 | 2020-01-17 | 中国船舶工业集团公司第七0八研究所 | Shore power cable overload protection system of marine shore power box |
| CN110707659B (en) * | 2019-09-10 | 2022-01-11 | 中国船舶工业集团公司第七0八研究所 | Shore power cable overload protection system of marine shore power box |
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| CN107039958B (en) | 2019-11-01 |
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