CN107039958B - A kind of protection system to earth and method of wind power plant box type transformer low-pressure system - Google Patents
A kind of protection system to earth and method of wind power plant box type transformer low-pressure system Download PDFInfo
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- CN107039958B CN107039958B CN201710434070.1A CN201710434070A CN107039958B CN 107039958 B CN107039958 B CN 107039958B CN 201710434070 A CN201710434070 A CN 201710434070A CN 107039958 B CN107039958 B CN 107039958B
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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 the protection system to earth and method of a kind of wind power plant box type transformer, which includes current acquisition module, amperometry module and breaker control module.Current acquisition module is mounted in the connecting 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 exports trip signal when secondary split-phase electric current is greater than current setting for receiving secondary split-phase electric current；Breaker control module is used to receive trip signal and controls the circuit breaker trip being arranged between the box type transformer and Wind turbines.When ground fault occurs for the connecting cable of box type transformer low-pressure side, the secondary split-phase electric current that current acquisition module is transmitted to amperometry module is greater 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 technique
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.Currently, wind power plant generallys use one carton deformed formula of a machine, it may be assumed that every wind power generating set is logical in wind power plant
It crosses matched box type transformer and is linked into collection electric line, collection electric line summarizes after several wind power generating set electric power simultaneously
Enter booster stations, is connected finally by the main transformer of wind power plant with supply network.
In the prior art, Wind turbines are electrically connected by connecting cable with matched box type transformer, and the two of connecting cable
A breaker is respectively set in end, and the breaker close to Wind turbines is the grid-connected breaker of blower, 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 control respectively
The trip operation of blower grid-connected breaker and low-voltage circuit breaker.Since the matched box type transformer of Wind turbines is generally in low-pressure side
System uses direct grounding way, cause case low pressure side system come true on earthed system, the master of Wind turbines in addition
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 ground fault occurs in subsystem, ground protection purpose can only be reached by the buckle releaser driving trip operation of breaker itself.
But the tripping function of the breaker of different model has larger difference: the buckle releaser of the breaker having itself is not matched
Ground protection is set, when ground fault occurs in the low-pressure side primary system of box type transformer, this breaker can not fast trip；
The buckle releaser of some breakers itself is configured with ground protection, when ground fault occurs in the low-pressure side primary system of box type transformer
When, this breaker can trip, and still, whether ground protection movement is promptly and accurately decided by zero-sequence current, and zero sequence is electric
The acquisition of stream depends entirely on breaker itself, this results in scene to exist since signal acquisition inaccuracy and fixed value adjusting are tired
It is difficult and be forced the problem of exiting the protection.
In conclusion when ground fault occurs in the connecting cable between Wind turbines and box type transformer, due to box
The definite value that the breaker of step down side does not have ground protection function or its ground protection function usually fails rationally whole
It is fixed, prevent breaker cuts off failure and the accident of equipment damage is caused to happen occasionally from tripping in time, seriously affect wind-powered electricity generation
The production safety of field.
Summary of the invention
The present invention provides the protection system to earth and method of a kind of wind power plant box type transformer low-pressure system, existing to solve
Have in technology, when ground fault occurs in the connecting cable between Wind turbines and box type transformer, since box type transformer is low
The breaker of pressure side does not have ground protection function usually or the definite value of its ground protection function fails rationally to adjust and cause
Breaker cannot trip in time and cut off the problem of failure leads to equipment damage.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions:
According to a first aspect of the embodiments of the present invention, a kind of protection system to earth of wind power plant box type transformer is provided,
Including current acquisition module, amperometry module and breaker control module, in which:
The current acquisition module is mounted in box type transformer low-pressure side connecting cable surface, for acquiring the box change
The split-phase electric current of depressor low-pressure side, the split-phase electric current that will acquire are converted into secondary split-phase electric current；
The amperometry module is for receiving the secondary split-phase electric current, when the secondary split-phase electric current is whole greater than electric current
Trip signal is exported when definite value；
The breaker control module is arranged for receiving the trip signal, control in 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, in which:
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 connecting cable mounted.
Further, the amperometry module includes overcurrent relay and time-delay relay, in which:
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 exports time delayed signal when the secondary split-phase electric current is greater 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 movement, export trip signal after deferred action.
Further, the overcurrent relay includes three split-phase overcurrent relays and a zero sequence overcurrent relay,
In:
Secondary terminals of the coil terminals of three split-phase overcurrent relays respectively with the current acquisition module are electrically connected
It connects, the secondary split-phase electric current being respectively used on phase line cable where receiving it, when the secondary split-phase electric current is greater than split-phase
When current setting, split-phase time delayed signal is exported；
It connects respectively with the coil terminals of the zero sequence overcurrent relay after three split-phase overcurrent relays are in parallel company
It connecing, 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 greater 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, in which:
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, exports sequential trip signal；
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, exports zero sequence trip signal.
Further, the breaker control module includes breaking coil, in which:
The breaking coil for receiving the trip signal, and make setting the Wind turbines and box type transformer it
Between circuit breaker trip.
Further, the breaker control module further includes intermediate relay, in which:
The intermediate relay issues alarm signal for receiving the trip signal.
Further, the breaker control module further includes split phase signal relay and zero sequence signal relay, in which:
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 control signal；
The breaking coil is electrically connected with the coil terminals of the split phase signal relay and zero sequence signal relay respectively,
For receiving the sequential trip control signal and zero sequence tripping control signal；
Node terminal of the intermediate relay respectively with the split phase signal relay and zero sequence signal relay is electrically connected
It connects, for receiving the sequential trip control signal and zero sequence tripping control signal, and issues alarm signal.
According to a second aspect of the embodiments of the present invention, a kind of earthing protecting method of wind power plant box type transformer is provided,
The described method includes:
The split-phase electric current in box step down side connecting cable is acquired 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 acquired using overcurrent relay, and to judge whether the secondary split-phase electric current is greater than whole
Constant current value；
If the secondary split-phase current value is greater than the setting current value, tripping letter is exported to breaker control module
Number；
The breaker control module is arranged according to trip signal control in the box type transformer and Wind turbines
Between circuit breaker trip.
By above technical scheme as it can be seen that 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 connecting 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 and current acquisition module are connected in series, for receiving secondary split-phase electric current,
Trip signal is exported when secondary split-phase electric current is greater than current setting；Breaker control module is electrically connected with amperometry module
It connects, for receiving trip signal and controlling the circuit breaker trip being arranged between the box type transformer and Wind turbines.Work as case
When ground fault occurs for the connecting cable of formula step down side, current acquisition module gets the two of box type transformer low-pressure side
Secondary split-phase electric current；Secondary split-phase electric current is greater than the current setting of amperometry module setting, the output of amperometry module at this time
Trip signal；Breaker control module receives trip signal and jumps the breaker between box type transformer and Wind turbines
Lock.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these 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 are as follows:
10- current acquisition module, 11- split-phase type current transformer, 111- the first split-phase type current transformer, 112- second
Split-phase type current transformer, 113- third split-phase type current transformer, 20- amperometry module, 21- overcurrent relay, 211-
Split-phase overcurrent relay, 2111- the first split-phase overcurrent relay, 2112- the second split-phase overcurrent relay, 2113- third split-phase
Overcurrent relay, 212- zero sequence overcurrent relay, 22- time-delay relay, 221- split-phase time-delay relay, 222- zero sequence delay after
Electric appliance, 23- power positive end switch, 24- power supply negative terminal switch, 30- breaker control module, 31- breaking coil, 32- split-phase letter
Number relay, 33- zero sequence signal relay, 34- intermediate relay, 4- box type transformer, 41- low-voltage circuit breaker, 5- wind turbine
Group, the grid-connected breaker of 51- blower.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
It is a kind of the basic of protection system to earth of wind power plant box type transformer provided in an embodiment of the present invention referring to Fig. 1
Structural schematic diagram.Wind turbines 5 are electrically connected by connecting cable with matched box type transformer 4, the both ends difference of connecting cable
One breaker is set, and the breaker close to Wind turbines is the grid-connected breaker 51 of blower, 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 connecting cable surface, ground connection system
System includes current acquisition module 10, amperometry module 20 and breaker control module 30.
It referring to fig. 2, 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
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 connecting cable surface between 4 low-pressure side of box type transformer and Wind turbines 5, and split-phase type current transformer 11 can
The split-phase current signal in its connecting cable mounted is acquired, and the split-phase current signal that will acquire is converted to secondary split-phase
Current signal, secondary split-phase electric current are exported through the secondary terminals of split-phase type current transformer 11.
Amperometry module 20 includes overcurrent relay 21 and time-delay relay 22, and overcurrent relay 21 has adjusting function
Can, when the current value for flowing through overcurrent relay 21 is greater than the setting valve of setting, the normally opened node of overcurrent relay 21 is closed, and is opened
Dynamic time-delay relay 22；After there is time-delay relay 22 delay function, time-delay relay 22 to start, trigger movement, delay
After movement, amperometry module 20 exports trip signal.Overcurrent relay 21 includes split-phase type overcurrent relay 211 and zero
Sequence overcurrent relay 212, time-delay relay 22 include 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 controls, and split phase signal relay 32 and zero sequence signal relay 33 can also control intermediate relay 34.Work as split-phase
After signal relay 32 or zero sequence signal relay 33 receive trip signal, the starting of one side breaking coil 31 is low to control
Voltage breaker 41 and the grid-connected breaker 51 of blower trip, and cut off the connecting cable between Wind turbines 5 and box type transformer 4, prevent
Only equipment damage；The starting of another aspect intermediate relay 34 issues alarm signal, and notice 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 intermediate relay 34, cable maintenance
Personnel, by the working condition of observation low-voltage circuit breaker 41 and the grid-connected breaker 51 of blower, can also have found to be grounded 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 11: the first split-phase type current transformers 111, second of split-phase type current transformer
Split-phase type current transformer 112 and third split-phase type current transformer 113 are equipped on the three-phase of 4 low-pressure side of box type transformer respectively
Connecting cable surface, the split-phase electric current of each phase for obtaining 4 low-pressure side of box type transformer respectively, and convert split-phase electric current to
Secondary split-phase electric current.Three 211: the first split-phase overcurrent relays 2111 of split-phase overcurrent relay, the second split-phase overcurrent relays
2112 and third split-phase overcurrent relay 2113 be 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 greater 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 overcurrents
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
Be electrically connected afterwards with one end of the coil terminals of zero sequence overcurrent relay 212, 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 connecting cable three-phase, connecting 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 referring to fig. 4, 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
The timing circuit figure of analysis module.First split-phase overcurrent relay 2111, the second split-phase overcurrent relay 2112 and third split-phase
Power positive end L+ is accessed after node terminal one end of overcurrent relay 2113 is in parallel, after the other end is in parallel with split-phase time-delay relay
One end of 221 coil terminals is electrically connected, and the other end of the coil terminals of split-phase time-delay relay 221 accesses power supply negative terminal L-,
Forming circuit.Power positive end L+, the other end and zero sequence time-delay relay are accessed in one end of 212 node terminal of zero sequence overcurrent relay
One end of 222 coil terminals is electrically connected, and the other end of zero sequence time-delay relay coil terminals accesses power supply negative terminal L-, is formed back
Road.
When the secondary split-phase current signal that the first split-phase overcurrent relay 2111 receives is greater than split-phase current setting,
The normally opened node of first split-phase overcurrent relay 2111 is closed and issues split-phase time delayed signal, and split-phase time-delay relay 221 receives
Start split-phase deferred action after to split-phase time delayed signal；Second split-phase overcurrent relay 2112 and third split-phase overcurrent relay
2113 course of work is identical as the first split-phase overcurrent relay 2111.When the zero sequence that zero sequence overcurrent relay 212 receives
When current signal is greater than zero sequence current setting value, the normally opened node of residual current relay 212 is closed and issues zero sequence delay letter
Number, zero sequence time-delay relay 222 starts zero sequence deferred action after receiving 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.Power positive end L+, the other end and split-phase are accessed in one end of 221 node terminal of split-phase time-delay relay
One end of 32 coil terminals of signal relay is electrically connected, the other end and breaking coil 31 of 32 coil terminals of split phase signal relay
One end of coil terminals is electrically connected, and the other end of breaking coil 31 accesses power supply negative terminal L-, forming circuit.Zero sequence time-delay relay
Power positive end L+ is accessed in one end of 222 node terminals, and the other end is electrically connected with one end of 33 coil terminals of zero sequence signal relay,
The other end of 33 coil terminals of zero sequence signal relay is electrically connected with one end of 31 coil terminals of breaking coil, breaking coil 31
The other end accesses power supply negative terminal L-, forming circuit.
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.Split phase signal relay 32,33 node terminal of zero sequence signal relay one end access electricity jointly
Source anode L+, 34 coil of split phase signal relay 32, the other end of 33 node terminal of zero sequence signal relay and intermediate relay
One end of terminal is electrically connected, and the other end of 33 coil terminals of zero sequence signal relay accesses power supply negative terminal L-, forming circuit.
After the deferred action of split-phase time-delay relay 221, the normally opened node closure of split-phase time-delay relay 221 is simultaneously
Sequential trip signal is issued, split phase signal relay 32 receives sequential trip signal；When the delay of zero sequence time-delay relay 222 is dynamic
After work, the normally opened node of zero sequence time-delay relay 222 is closed and issues 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 receives
After zero sequence trip signal, breaking coil 31 starts so that 41 open circuit of the grid-connected breaker 51 of blower and low-voltage circuit breaker, disconnects box
Transformer 4 and wind are with the connecting cable between unit 5.
After split phase signal relay 32 receives sequential trip signal, the normally opened node closure of split phase signal relay 32 is simultaneously
It sends sequential trip and controls signal；After zero sequence signal relay 33 receives zero sequence trip signal, zero sequence signal relay 33
Normally opened node is closed and sends zero sequence tripping control signal.Intermediate relay 34 receives sequential trip control signal or zero sequence
After tripping control signal, intermediate relay 34 issues alarm signal, and notice cable maintenance personnel look into time to repair.
Based on above-mentioned protection system, the embodiment of the invention also provides a kind of ground protection sides of wind power plant box type transformer
Method, this method specifically comprise the following steps:
Step S110: the electricity of the split-phase in box step down side connecting cable is acquired 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 acquired using overcurrent relay, and judges the secondary split-phase electric current
Whether setting current value is greater than；
Step S130: defeated to breaker control module if the secondary split-phase current value is greater than the setting current value
Trip signal out；
Step S140: the breaker control module according to trip signal control setting in the box type transformer and
Circuit breaker trip between Wind turbines.
In conclusion 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 connecting cable surface of 4 low-pressure side of box type transformer, for obtaining the split-phase electric current of 4 low-pressure side of box type transformer simultaneously
It is translated into secondary split-phase electric current；Amperometry module 20 and current acquisition module 10 are connected in series, for receiving secondary point
Phase current exports trip signal when secondary split-phase electric current is greater than current setting；Breaker control module 30 and amperometry
Module 20 is electrically connected, for receiving trip signal and controlling the open circuit being arranged between the box type transformer 4 and Wind turbines 5
Device tripping.When ground fault occurs for the connecting cable of 4 low-pressure side of box type transformer, current acquisition module 10 gets box change
The secondary split-phase electric current of 4 low-pressure side of depressor；Secondary split-phase electric current is greater than the current setting that amperometry module 20 is set at this time,
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 motor group 5.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various 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, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (7)
1. a kind of protection system to earth of wind power plant box type transformer, which is characterized in that the system comprises current acquisition modules
(10), amperometry module (20) and breaker control module (30), in which:
The current acquisition module (10) is mounted in 4 low-pressure side connecting cable surface of box type transformer, described box for acquiring
The split-phase electric current of 4 low voltage side cable of transformer, the split-phase electric current that will acquire are converted into secondary split-phase electric current, wherein described
Secondary split-phase electric current includes all information of the split-phase electric current；
The amperometry module (20) is for receiving the secondary split-phase electric current, when the secondary split-phase electric current is whole greater than electric current
Trip signal is exported when definite value；
The breaker control module (30) is arranged for receiving the trip signal, control in the box type transformer 4 and wind
Circuit breaker trip between motor group 5；
The amperometry module (20) includes overcurrent relay (21) and time-delay relay (22), in which:
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, exports time delayed signal when the secondary split-phase electric current is greater 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 movement, export trip signal after deferred action；
The overcurrent relay (21) includes three split-phase overcurrent relays (211) and a zero sequence overcurrent relay (212),
In:
The coil terminals of three split-phase overcurrent relays (211) secondary terminals with the current acquisition module (10) respectively
Electrical connection, the secondary split-phase electric current being respectively used on phase line cable where receiving it, when the secondary split-phase electric current is greater than
When split-phase current setting, split-phase time delayed signal is exported；
Coil terminals with the zero sequence overcurrent relay (212) respectively after three split-phase overcurrent relays (211) are in parallel
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)
It is superposed to zero-sequence current, when the zero-sequence current is greater than zero sequence current setting value, exports zero sequence time delayed signal.
2. system according to claim 1, which is characterized in that the current acquisition module (10) includes that split-phase type electric current is mutual
Sensor (11), in which:
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 each split-phase electric current in connecting cable mounted.
3. system according to claim 1, which is characterized in that the time-delay relay (22) includes split-phase time-delay relay
(221) and zero sequence time-delay relay (222), in which:
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
It connects, for receiving the split-phase time delayed signal, and starts 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
It connects, for receiving the zero sequence time delayed signal, and starts zero sequence deferred action, after zero sequence deferred action, output zero sequence tripping letter
Number.
4. system according to claim 3, which is characterized in that the breaker control module (30) includes breaking coil
(31), in which:
The breaking coil (31) for receiving the trip signal, and make setting the Wind turbines and box type transformer it
Between circuit breaker trip.
5. system according to claim 4, which is characterized in that the breaker control module (30) further includes intermediate relay
Device (34), in which:
The intermediate relay (34) issues alarm signal for receiving the trip signal.
6. system according to claim 5, which is characterized in that the breaker control module (30) further includes split phase signal
Relay (32) and zero sequence signal relay (33), in which:
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 control signal；
The breaking coil (31) coil-end with the split phase signal relay (32) and zero sequence signal relay (33) respectively
Son electrical connection, for receiving the sequential trip control signal and zero sequence tripping control signal；
The intermediate relay (34) node with the split phase signal relay (32) and zero sequence signal relay (33) respectively
Terminal electrical connection for receiving the sequential trip control signal and zero sequence tripping control signal, and issues alarm signal.
7. a kind of earthing protecting method of wind power plant box type transformer, box using the wind power plant any in claim 1-6
The protection system to earth of transformer, which is characterized in that the described method includes:
The split-phase electric current in box step down side connecting cable is acquired 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 acquired using overcurrent relay, and judges whether the secondary split-phase electric current is greater than adjusting electricity
Flow valuve；
If the secondary split-phase current value is greater 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107039958A CN107039958A (en) | 2017-08-11 |
| CN107039958B true CN107039958B (en) | 2019-11-01 |
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| CN108054785A (en) * | 2018-01-27 | 2018-05-18 | 丘健兴 | A kind of circuit for preventing wind power plant island-grid |
| 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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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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