CN109861170A - Nuclear power station presses overcurrent protective device and generator protection system again - Google Patents
Nuclear power station presses overcurrent protective device and generator protection system again Download PDFInfo
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- CN109861170A CN109861170A CN201910249678.6A CN201910249678A CN109861170A CN 109861170 A CN109861170 A CN 109861170A CN 201910249678 A CN201910249678 A CN 201910249678A CN 109861170 A CN109861170 A CN 109861170A
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Abstract
This application involves generator of nuclear power station and power transmission protection systems technology field; it provides a kind of nuclear power station and presses overcurrent protective device and generator protection system again; described device includes: overcurrent element; for sending guarded command to protection element under the first preset condition, and over-current signal is sent to low voltage component when generator end meets overcurrent condition；The low pressure original part being connect with overcurrent element and Generator Outlet Switchgear, for keeping output low-voltage signal to overcurrent element under the second preset condition；And when Generator Outlet Switchgear is in an off state, controlling is off-state between overcurrent element and low voltage component；Second preset condition includes: the over-current signal that generator end meets lower pressure and receives overcurrent element transmission；Protection element is connect with overcurrent element and main transformer, controls signal for exporting transformer tripping according to guarded command.It presses overcurrent protective device can be avoided again using this nuclear power station and is in an off state lower malfunction in Generator Outlet Switchgear.
Description
Technical field
This application involves generator of nuclear power station and power transmission protection systems technology field, press again more particularly to a kind of nuclear power station
Overcurrent protective device and generator protection system.
Background technique
Generator and power transmission protection system (GPA) generally comprise two protection channels, and two protection channels are each equipped with hair
Motor presses overcurrent protection (back-up protection) again, can jump and (disconnect) main transformer high side switch (for connecting in the system failure
Connect main transformer and external power grid), so that generator and external power grid be cut off.
Generally, there is also differential protection (main protections) for generator and power transmission protection system.For example, working as generator phase
Between short trouble when, differential protection for generator movement, control generator outlet breaker (GCB, Generator Circuit-
Breaker) tripping and degaussing switch act demagnetization, reduce generator outlet voltage and current, at this time fault generator at
Function is cut off by main protection.
However, the electric current of generator output end meets the overcurrent item for pressing overcurrent protective device again when short trouble occurs
Part, therefore the overcurrent element movement of overcurrent protective device is pressed again；The voltage of generator end output simultaneously reduces, and meets low-pressure section
Part, therefore the low voltage component of overcurrent protective device is pressed to keep output low-voltage signal again, after predetermined delay, it can still jump main transformer height
Side switch is pressed, power so that external power grid becomes without normal direction factory, and then alarm, equipment power loss (such as nuclear power plant's shutdown) may be triggered etc.
Problem.That is, under the situation that fault generator has been cut off by differential protection for generator, since multiple pressure overcurrent protection misses
Dynamic, main transformer high side switch still trips, so that accident range expands.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, provide a kind of nuclear power station that can be avoided malfunction and press through stream again and protect
Protection unit and generator protection system.
In a first aspect, a kind of nuclear power station presses overcurrent protective device again, comprising:
Overcurrent element, for full to protection element transmission guarded command, and in generator end under the first preset condition
Over-current signal is sent to low voltage component when sufficient overcurrent condition；First preset condition includes at least one of the following contents:
The low-voltage signal that generator end meets overcurrent condition, receives low voltage component transmission；It includes: hair that generator end, which meets overcurrent condition,
The output electric current of motor side is greater than predetermined current definite value；
Low voltage component connect with the overcurrent element, and connect with Generator Outlet Switchgear, in the second preset condition
Under, Xiang Suoshu overcurrent element keeps output low-voltage signal；And when the Generator Outlet Switchgear is in an off state, control
It is off-state between the overcurrent element and the low voltage component；Second preset condition include: generator end meet it is low
Press strip part and the over-current signal for receiving overcurrent element transmission, generator end meet the output that lower pressure includes: generator end
Voltage is less than predeterminated voltage definite value；
Protection element is connect with the overcurrent element and main transformer, is jumped for exporting main transformer according to the guarded command
Lock controls signal；The transformer tripping control signal is for controlling the main transformer tripping.
The low voltage component is also used to be in closed state in the Generator Outlet Switchgear in one of the embodiments,
When, it controls between the overcurrent element and the low voltage component as connection status.
The Generator Outlet Switchgear is generator outlet breaker, the low voltage component in one of the embodiments,
It is connect with the position contact of the generator outlet breaker, the logical value for being exported according to the position contact, controls institute
It states between overcurrent element and the low voltage component as off-state or connection status；The logical value and the generator outlet are disconnected
The state of road device is related, including disconnects logical value and closure logical value.
The low voltage component includes connection switch in one of the embodiments, and the connection switch is described for connecting
The part of the connection switch is removed in overcurrent element and the low voltage component；The connection switch includes connection status and disconnection shape
State.
Described device in one of the embodiments, further include:
Low pressure memory cell is connect with the low voltage component, for being more than pre- in low voltage component output low-voltage signal
If after the time, Xiang Suoshu low voltage component exports stop signal；The stop signal is low for making the low voltage component stop output
Press signal.
It is connected in one of the embodiments, between the low voltage component and Generator Outlet Switchgear for optocoupler.
The nuclear power station presses the generator end of overcurrent protective device and nuclear power station to pass through mutual again in one of the embodiments,
Feel coil connection.
Second aspect, a kind of generator protection system, comprising: generator main protection device and above-mentioned nuclear power station press through stream again
Protective device；The generator main protection device includes: Generator Outlet Switchgear；The Generator Outlet Switchgear is for connecting hair
Motor and main transformer, and connect with the low voltage component, for disconnecting generator and master in generator phase fault
Connection between transformer.
The Generator Outlet Switchgear is generator outlet breaker in one of the embodiments, and the generator goes out
Mouth breaker includes position contact；The position contact is used for when detecting that generator outlet breaker is in open position,
First group of protection definite value is exported, and when detecting that generator outlet breaker is in the close position, exports second group of protection
Definite value；First group of protection definite value mesolow element state definite value is to disconnect logical value；It is low in second group of protection definite value
Pressing element state definite value is closure logical value.
The generator main protection device is 7UM622 type protective device in one of the embodiments,.
Above-mentioned nuclear power station presses overcurrent protective device and generator protection system again, can press through stream guarantor playing conventional answering
In the case that shield acts on, avoids being in an off state lower malfunction in Generator Outlet Switchgear, avoid the expansion of accident range.
Detailed description of the invention
Fig. 1 is the applied environment figure that nuclear power station presses overcurrent protective device again in one embodiment；
Fig. 2 a is the structural block diagram that nuclear power station presses overcurrent protective device again in one embodiment；
Fig. 2 b is the relay protective scheme block diagram that nuclear power station presses overcurrent protective device again in one embodiment；
Fig. 3 is the relay protective scheme schematic diagram that nuclear power station presses overcurrent protective device again in one embodiment；
Fig. 4 a is one of the schematic diagram that low voltage component state definite value is arranged in one embodiment；
Fig. 4 b is two of the schematic diagram of setting low voltage component state definite value in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
Nuclear power station provided by the present application presses overcurrent protective device again, can be applied in application environment as shown in Figure 1.Its
In, steam turbine is connect with generator, and generator is connect with main transformer low-pressure side, and main transformer high-pressure side can connect dispatch from foreign news agency
Net drives generator rotation to realize power generation, and sends the electricity of sending to by main transformer it is possible thereby to be done work by steam turbine
External power grid；In addition, generator is connect with magnet exciting coil magnetic coupling, magnet exciting coil can generate operating fields for generator；Main transformer
Depressor low-pressure side is also connect with factory transformer, for powering into power plant.
Wherein, steamer pusher side is provided with steam turbine emergency stop valve C (emergency trip valve) and halt turbines valve D (by more
A high-pressure stop valve composition), magnet exciting coil side is provided with degaussing switch E；Generator outlet side is provided with Generator Outlet Switchgear,
For connecting generator and main transformer low-pressure side；Main transformer high-pressure side is provided with main transformer high-pressure side breaker A and main transformer is high
Press side breaker B；Above-mentioned A, B, C, D, E are a part of generator protection system, generator protection system can by
A, B, C, D, E are controlled when generator failure realizes generator protection.Nuclear power station presses overcurrent protective device again, as generator protection
The back-up protection of system equally can control A, B, C, D, E and realize generator protection.
In one embodiment, as shown in Figure 2 a and 2 b, it provides a kind of nuclear power station and presses overcurrent protective device again, to answer
For being illustrated for environment shown in FIG. 1, may include:
Overcurrent element 11 is used to send guarded command to protection element 13 under the first preset condition, and in generator
Over-current signal is sent to low voltage component 12 when end meets overcurrent condition；First preset condition include in the following contents at least
It is a kind of: the low-voltage signal that generator end meets overcurrent condition, receives the transmission of low voltage component 12；Generator end meets overcurrent condition
It include: the output electric current of generator end greater than predetermined current definite value；
Low voltage component 12 connect with the overcurrent element 11, and connect with Generator Outlet Switchgear, for default second
Under the conditions of, Xiang Suoshu overcurrent element 11 keeps output low-voltage signal；And it is in an off state in the Generator Outlet Switchgear
When, it controls between the overcurrent element 11 and the low voltage component 12 as off-state；Second preset condition includes: power generation
Generator terminal meets lower pressure and receives the over-current signal of the transmission of overcurrent element 11, and it includes: hair that generator end, which meets lower pressure,
The output voltage of motor side is less than predeterminated voltage definite value；
Protection element 13 is connect with the overcurrent element 11 and main transformer, is led for being exported according to the guarded command
Become tripping control signal；The transformer tripping control signal is for controlling the main transformer tripping.
When generator breaks down (such as internal phase fault), the output electric current of generator end be will increase, therefore overcurrent
Whether the output electric current that element can detecte generator end is greater than predetermined current definite value, when generator end meets overcurrent condition,
Overcurrent element can send guarded command to protection element, export transformer tripping to control protection element according to the guarded command
Control signal；It is disconnected that the transformer tripping control signal can control main transformer high-pressure side breaker A and main transformer high-pressure side breaker B
It opens.Generally, referring to shown in Fig. 2 b, the protection element may include delayer, and delayer can continue defeated in overcurrent element
Out after guarded command preset time T, just exports transformer tripping and control signal, wherein preset time T is adjustable；The protection member
Part can also include the Tripping matrix connecting with delayer, and Tripping matrix is made of multiple trip switches, when can carry out different
Long delay process.
It working under the magnetic field that magnet exciting coil generates however, generator is generally required, field power supply is derived from generator outlet,
While generator end failure causes to export electric current increase, the output voltage of generator end can decline, so that magnet exciting coil is electric
Drops, exciting current reduce, and cause the output electric current of generator end that cannot maintain, i.e. output electric current can reduce；Therefore, if
For overcurrent element only when generator end meets overcurrent condition, output protection order is then easy to happen the output electric current of generator end
Decline leads to relay fail suddenly, i.e., does not execute protection act.
Therefore on the basis of overcurrent protection, increase memory function using overcurrent protection is pressed again in the present embodiment, once
Overcurrent protection starting, even if current value drops to current ration hereinafter, can keep output low-voltage signal using low voltage component, so that
Low voltage component can press again overcurrent protective device being capable of efficient starting protection with output protection order, i.e. nuclear power station.Specifically, low pressure
Element is configured as sending over-current signal, correspondingly, low voltage component quilt to low voltage component when generator end meets overcurrent condition
When being configured to meet lower pressure in generator end and receive the over-current signal of overcurrent element transmission, keep defeated to overcurrent element
Low-voltage signal out；The overcurrent element is additionally configured to when receiving the low-voltage signal of low voltage component transmission, to protection element
Guarded command is sent, therefore above-mentioned relay protective scheme may be implemented.
But there are Generator Outlet Switchgears to be in an off state for above-mentioned relay protective scheme, cuts off sick engine
In the case where, overcurrent element can also send guarded command to protection element when receiving the low-voltage signal of low voltage component transmission,
So that nuclear power station presses the problem of overcurrent protective device malfunction again.Therefore, in the present embodiment, low voltage component can be with the power generation
The connection of machine gate out switch, can detecte the state of Generator Outlet Switchgear, and when Generator Outlet Switchgear is in an off state,
Controlling is off-state between overcurrent element and low voltage component, and the low-voltage signal that partition low voltage component is sent to overcurrent element makes
Overcurrent element is obtained when Generator Outlet Switchgear is in an off state, multiple pressure over-current signal can not be received without trigger protection
Movement；Meanwhile because Generator Outlet Switchgear disconnects, the output electric current of generator can also be reduced, can't meet overcurrent condition and
Trigger protection movement, therefore avoid the malfunction that nuclear power station presses overcurrent protective device again.
It should be noted that above-mentioned over-current signal, low-voltage signal etc. can be analog signal, it is also possible to digital signal,
It can also be logical signal " 0 " or " 1 ", as long as being able to achieve above-mentioned relay protective scheme.
The nuclear power station of the present embodiment presses overcurrent protective device can be in the feelings for playing conventional multiple pressure overcurrent protection again
Under condition, avoids being in an off state lower malfunction in Generator Outlet Switchgear, avoid the expansion of accident range.
Optionally, the low voltage component 12 be also used to the Generator Outlet Switchgear in the closure state, control institute
It states between overcurrent element 11 and the low voltage component 12 as connection status.In this way, low voltage component can be actively in generator outlet
Switch in the closure state, maintains to be connection status between overcurrent element and the low voltage component, can be in generator outlet
Switch plays due protective effect because remaining under the scene of special circumstances tripping, realizes backup protection.
In one embodiment, the Generator Outlet Switchgear is generator outlet breaker, the low voltage component 12 with
The position contact of the generator outlet breaker connects, the logical value for being exported according to the position contact, described in control
It is off-state or connection status between overcurrent element 11 and the low voltage component 12；The logical value and the generator outlet
The state of breaker is related, including disconnects logical value and closure logical value.
It should be noted that under application scenes, the Generator Outlet Switchgear between generator and main transformer is
On-load switch；The failure that protection exit full cut-off is needed for main transformer, factory's change or 26kV bus etc., since on-load switch can only be in steamer
Machine tripping, degaussing switch, which disconnect etc., to be opened logic by on-load switch after disconnections and could open, cause generator will in short-term and
Main transformer and factory's transformer are connected, and generator still provides electric current to fault point in the exciting current decling phase of magnet exciting coil；And work as
When Generator Outlet Switchgear between generator and main transformer is generator outlet breaker (GCB), due to the characteristic of GCB,
Steam turbine tripping, degaussing switch disconnect when, can simultaneously tripping GCB, so as to cut off generator and failure in time
The connection of point electricity, and make main transformer etc. and be better protected.The present embodiment can be applied to various Generator Outlet Switchgears,
Including but not limited to on-load switch, GCB.
When Generator Outlet Switchgear is generator outlet breaker, breaker is realizing this function of the on-off of circuit
At the same time it can also pass through position contact to other component output signals；In the present embodiment, generator outlet breaker can wrap
Position contact is included, which can detect generator outlet breaker according to the position of the switch of generator outlet breaker
In closed state, it is in off-state；The position contact can be in closure detecting generator outlet breaker
When position, output closure logical value, detect generator outlet breaker be in close gate position when, output disconnect logical value.
Correspondingly, the low voltage component can be connect with the position contact of the generator outlet breaker, and be connect according to the position
The disconnection logical value of point output controls between the low voltage component and the overcurrent element as off-state；And according to described
The closure logical value of position contact output controls between the low voltage component and the overcurrent element as connection status.
Optionally, referring to shown in Fig. 2 b, the low voltage component 12 includes connection switch 121, and the connection switch 121 is used for
Connect the part that the connection switch is removed in the overcurrent element 11 and the low voltage component；The connection switch includes connection shape
State and off-state.
It should be noted that in the present embodiment, the separated or connection of control low voltage component and overcurrent element is simultaneously unlimited
It realizes, can also be realized by way of output logic signal in by control connection switch.For example, when low voltage component exists
Under second preset condition to overcurrent element export low-voltage signal be logical signal " 1 ", in the case where being unsatisfactory for the second preset condition to
When overcurrent element output logic signal " 0 "；Low voltage component can generate characterization generator according to the state of Generator Outlet Switchgear
The logical signal " 0 " of gate out switch state or " 1 ", respectively indicate and close lock state and closed state；Low voltage component can will characterize
The logical signal of Generator Outlet Switchgear state and the former logical signal exported to overcurrent element input AND gate circuit, and will
The logical signal of AND gate circuit output, is sent to overcurrent element as new low-voltage signal.
Specifically, referring to shown in Fig. 3, the logical schematic of the multiple pressure overcurrent protection of the present embodiment is shown.Wherein, work as hair
When motor side meets overcurrent condition and Generator Outlet Switchgear tripping, the output of electric current judgment component is " 1 ", when generator end meets
When lower pressure, the output of voltage judgment component is " 1 ", then the output of AND gate element is " 1 "；Therefore, the end rest-set flip-flop S, which inputs, is
" 1 ", the input of the end R are " 0 ", and the output of the end S is " 1 "；When Generator Outlet Switchgear tripping, Generator Outlet Switchgear is to close lock shape
State, correspondingly, connection switch are connection status, and the input of OR-gate element is respectively " 1 " and " 1 ", then OR-gate element output is
" 1 ", i.e. output protection order, to realize that protection act, i.e. delay T1 jump A, B switch, then the T2 that is delayed by protection element 13
Jump C, D, E, G switch；Wherein, even if generator end current reduction and when being unsatisfactory for overcurrent condition in the process, electric current judgement
Element output is " 0 ", and the output of AND gate element is " 0 ", and the input of the end rest-set flip-flop S is " 0 ", but the input of the end R is still " 0 ", therefore
Rest-set flip-flop can keep function, i.e. persistently output " 1 ", therefore can also realize protection act.
And when Generator Outlet Switchgear movement, Generator Outlet Switchgear is off-state, and correspondingly, connection switch is disconnected
Open state；And because of the protection act of Generator Outlet Switchgear, generator end is generally unsatisfactory for overcurrent condition, i.e. electric current judges
Element output is " 0 ", then the input of OR-gate element is respectively " 0 " and " 0 ", therefore the output of OR-gate element is " 0 ", i.e., will not touch
Protection act is sent out, that is, avoids malfunction.
Compared to Fig. 3, in the relay protective scheme in Fig. 2 b, three road electric current judgment components are increased in the logic of overcurrent element, because
It may triggering guarantor when generally there is L1, L2, L3 three-phase for output electric current, therefore in office can mutually meet overcurrent condition one by one
Shield；Locking judgment component is also added, is under normal circumstances patent lock status for protective device, i.e., logical signal is " 0 ", is related to
AND gate after inverter has no effect on the logic of overcurrent element.And in the logic of low voltage component, voltage judgment component and PT
Other two-way logical signal including broken string is input in AND gate, because in addition two-way logical signal is generally after inverter
It is " 1 ", therefore in addition two-way logical signal has no effect on the output of AND gate, it is only related to the output of voltage judgment component.
In one embodiment, referring to shown in Fig. 2 b, described device can also include: low pressure memory cell 14, and described
Low voltage component 12 connects, for being more than Xiang Suoshu low voltage component after preset time in the low voltage component 12 output low-voltage signal
12 output stop signals；The stop signal is for making the low voltage component 12 stop output low-voltage signal.
It is understood that referring to shown in Fig. 2 b, once overcurrent element sends over-current signal " 1 " to low voltage component, and low
When press strip part meets, rest-set flip-flop can export " 1 "；Even if overcurrent condition is unsatisfactory for, i.e., when the input of the end S is " 0 ", but as long as the end R
Input is " 0 ", and rest-set flip-flop can keep output " 1 ", that is, keep output low-voltage signal；When rest-set flip-flop keeps output " 1 "
Duration be greater than the preset time of low pressure memory cell after, low pressure memory cell inputs " 1 " to OR-gate, therefore OR-gate is inevitable
It exports " 1 ", therefore the input of the end R is " 1 ", then rest-set flip-flop can export " 0 ", stop output low-voltage signal, i.e. low pressure memory cell is logical
It crosses OR-gate and exports stop signal to low voltage component, the preset time of low pressure memory cell is that low voltage component keeps output low pressure letter
Number memory time.Therefore, the time that low pressure memory cell keeps output low-voltage signal can be adjusted flexibly in the present embodiment, to answer
To different protection scenes.
Optionally, it is connected between the low voltage component and Generator Outlet Switchgear for optocoupler；Optocoupler connection is with light for matchmaker
It is situated between and carrys out the device of transmission telecommunications number, usually photophore and light-receiving device is encapsulated in same shell, realize " electricity-light-electricity "
Conversion, has that small in size, the service life is long, contactless, strong antijamming capability, insulation, one-way transmission signal etc. between output and input
Advantage.Therefore low voltage component can detect the state of Generator Outlet Switchgear according to optic coupling element, can be more credible, more stably
The connection status between low voltage component and overcurrent element is controlled, while avoiding malfunction, also avoids tripping.
Optionally, the nuclear power station presses the generator end of overcurrent protective device and nuclear power station to connect by mutual inductor again.
The nuclear power station of the present embodiment presses overcurrent protective device to can be applied to the requirement to security level such as nuclear power station compared to conventional electricity again
Higher scene for standing.Generally, the sense that the voltage swing of generator end and size of current can be incuded by mutual inductor
Electric current and induced potential is answered to measure.
In one embodiment, the present embodiment also proposed a kind of generator protection system, comprising: generator main protection dress
It sets and presses overcurrent protective device again with above-mentioned nuclear power station；The generator main protection device includes: Generator Outlet Switchgear；The hair
Motor gate out switch is connect for connecting generator and main transformer with the low voltage component, for alternate short in generator
The connection between generator and main transformer is disconnected when the failure of road.
At least one main protection to generator may be implemented in above-mentioned generator main protection device, and main protection can be differential
Protection etc..
Optionally, the Generator Outlet Switchgear is generator outlet breaker, and the generator outlet breaker includes
Position contact；The position contact is used for when detecting that generator outlet breaker is in open position, exports first group of guarantor
Definite value is protected, and when detecting that generator outlet breaker is in the close position, exports second group of protection definite value；Described first
Group protection definite value mesolow element state definite value is to disconnect logical value；Second group of protection definite value mesolow element state definite value
To be closed logical value.
Optionally, the generator main protection device is 7UM622 type protective device.
Illustratively, two groups of definite values can be set in 7UM622 type protective device, pass through generator outlet breaker GCB's
Position contact switches over.When generator outlet breaker disconnects, position contact exports A group definite value；Work as generator breaker
When closure, position contact automatically switches output B group definite value.1204 (the low voltage component states relative to B group definite value, in A group definite value
Definite value) " OFF " is changed to by " ON ", the holding function of low voltage component after generator breaker disconnects is eliminated, current element is retained
Overcurrent tripping function；And when generator breaker closure, existing capability remains unchanged, i.e. B group definite value keeps current adjusting, right
Main transformer, factory, which become, retains the back-up protection function that nuclear power station presses overcurrent protective device again, when generator failure, main protection movement
Generator outlet circuit breaker trip, generator protection are switched to by B group definite value by (differential protection) automatically by the position contact of GCB
A group definite value, since A group definite value does not keep function, protection is returned.It should be noted that the present embodiment can be also used for
Other types of protective device.
In addition, the generator protection system can also include host computer and communication module, the host computer leads to described
Believe module connection；The communication module presses overcurrent protective device with the generator main protection device, the nuclear power station respectively again
Connection；The host computer is used to obtain the generator main protection device by the communication module and the nuclear power station presses through again
The state of protective device is flowed, and overcurrent protection is pressed to the generator main protection device, the nuclear power station according to the state again
Device carries out real-time monitoring, can specifically carry out the processing such as status display, state analysis or even alarm, convenient for discovery event early
Hinder and overhauls.The host computer can also be multiple to the generator main protection device, the nuclear power station by the communication module
Press overcurrent protective device carry out parameter setting, such as be arranged the generator outlet breaker position contact output definite value,
The memory time etc. of low pressure memory cell.
Interface signal after modification definite value described in interface schematic diagram and Fig. 4 b before the modification definite value referring to shown in Fig. 4 a
Scheme, the low voltage component in A group definite value can be modified on the software to match in host computer with the generator main protection device
State definite value is changed to " OFF " from by " ON ".Through live actual verification, the low voltage component state definite value is modified, protection is without again
Starting, working condition will not interrupt, and will not trigger alarm and device locking.
Specific restriction about above-mentioned generator protection system is referred to above-mentioned nuclear power station and presses in overcurrent protective device again
Explanation, which is not described herein again.
It will be understood by those skilled in the art that structure shown in Fig. 1-3, only part relevant to application scheme
The block diagram of structure, does not constitute the restriction for the computer equipment being applied thereon to application scheme, and specific computer is set
Standby may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of nuclear power station presses overcurrent protective device again characterized by comprising
Overcurrent element, for meeting under the first preset condition to protection element transmission guarded command, and in generator end
Over-current signal is sent to low voltage component when stream condition；First preset condition includes at least one of the following contents: power generation
The low-voltage signal that generator terminal meets overcurrent condition, receives low voltage component transmission；It includes: generator that generator end, which meets overcurrent condition,
The output electric current at end is greater than predetermined current definite value；
Low voltage component connect with the overcurrent element, and connect with Generator Outlet Switchgear, is used under the second preset condition,
Output low-voltage signal is kept to the overcurrent element；And when the Generator Outlet Switchgear is in an off state, institute is controlled
It states between overcurrent element and the low voltage component as off-state；Second preset condition includes: that generator end meets low pressure
Condition and the over-current signal for receiving overcurrent element transmission, generator end meet the output electricity that lower pressure includes: generator end
Pressure is less than predeterminated voltage definite value；
Protection element is connect with the overcurrent element and main transformer, for exporting transformer tripping control according to the guarded command
Signal processed；The transformer tripping control signal is for controlling the main transformer tripping.
2. the apparatus according to claim 1, which is characterized in that the low voltage component is also used to open in the generator outlet
It closes in the closure state, controls between the overcurrent element and the low voltage component as connection status.
3. the apparatus of claim 2, which is characterized in that the Generator Outlet Switchgear is generator outlet open circuit
Device, the low voltage component are connect with the position contact of the generator outlet breaker, for being exported according to the position contact
Logical value, control between the overcurrent element and the low voltage component as off-state or connection status；The logical value with
The state of the generator outlet breaker is related, including disconnects logical value and closure logical value.
4. the apparatus according to claim 1, which is characterized in that the low voltage component includes connection switch, and the connection is opened
It closes for connecting the part for removing the connection switch in the overcurrent element and the low voltage component；The connection switch includes connecting
Connect state and off-state.
5. the apparatus according to claim 1, which is characterized in that described device further include:
Low pressure memory cell is connect with the low voltage component, for when low voltage component output low-voltage signal is more than default
Between after, Xiang Suoshu low voltage component export stop signal；The stop signal is for making the low voltage component stop output low pressure letter
Number.
6. the apparatus according to claim 1, which is characterized in that be light between the low voltage component and Generator Outlet Switchgear
Coupling connects.
7. the apparatus according to claim 1, which is characterized in that the nuclear power station presses overcurrent protective device and nuclear power station again
Generator end is connected by mutual inductor.
8. a kind of generator protection system characterized by comprising any in generator main protection device and claim 1-7
Nuclear power station described in presses overcurrent protective device again；The generator main protection device includes: Generator Outlet Switchgear；The hair
Motor gate out switch is connect for connecting generator and main transformer with the low voltage component, for alternate short in generator
The connection between generator and main transformer is disconnected when the failure of road.
9. system according to claim 8, which is characterized in that the Generator Outlet Switchgear is generator outlet open circuit
Device, the generator outlet breaker include position contact；The position contact is for detecting generator outlet breaker
When in open position, first group of protection definite value is exported, and when detecting that generator outlet breaker is in the close position,
Export second group of protection definite value；First group of protection definite value mesolow element state definite value is to disconnect logical value；Described second
Group protection definite value mesolow element state definite value is closure logical value.
10. system according to claim 8, which is characterized in that the generator main protection device is the protection of 7UM622 type
Device.
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| CN201910249678.6A CN109861170B (en) | 2019-03-29 | 2019-03-29 | Nuclear power station combined voltage overcurrent protection device and generator protection system |
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| CN201910249678.6A CN109861170B (en) | 2019-03-29 | 2019-03-29 | Nuclear power station combined voltage overcurrent protection device and generator protection system |
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| CN109861170B CN109861170B (en) | 2020-07-31 |
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Citations (4)
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|---|---|---|---|---|
| US20130049707A1 (en) * | 2011-08-23 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Dc chopper and dc chopping method for doubly fed induction generator system |
| CN104579062A (en) * | 2014-12-08 | 2015-04-29 | 武汉科创源科技有限公司 | Low-voltage generator black start excitation device |
| CN108494013A (en) * | 2018-02-05 | 2018-09-04 | 国电南瑞科技股份有限公司 | Machine relaying configuration method is opened based on protected object |
| KR101923993B1 (en) * | 2017-09-22 | 2018-11-30 | 한국전기안전써비스(주) | Protection system of power line with neutral ground resistor and design method thereof |
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2019
- 2019-03-29 CN CN201910249678.6A patent/CN109861170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049707A1 (en) * | 2011-08-23 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Dc chopper and dc chopping method for doubly fed induction generator system |
| CN104579062A (en) * | 2014-12-08 | 2015-04-29 | 武汉科创源科技有限公司 | Low-voltage generator black start excitation device |
| KR101923993B1 (en) * | 2017-09-22 | 2018-11-30 | 한국전기안전써비스(주) | Protection system of power line with neutral ground resistor and design method thereof |
| CN108494013A (en) * | 2018-02-05 | 2018-09-04 | 国电南瑞科技股份有限公司 | Machine relaying configuration method is opened based on protected object |
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| CN109861170B (en) | 2020-07-31 |
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