CN107276061A - A kind of 110kV transformer neutral points protection device and method - Google Patents
A kind of 110kV transformer neutral points protection device and method Download PDFInfo
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- CN107276061A CN107276061A CN201710482423.5A CN201710482423A CN107276061A CN 107276061 A CN107276061 A CN 107276061A CN 201710482423 A CN201710482423 A CN 201710482423A CN 107276061 A CN107276061 A CN 107276061A
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- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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Abstract
The invention discloses a kind of 110kV transformer neutral points protection device, described device includes：Arrester, it is in parallel with control gap unit, under thunder and lightning and switching impulse, lightning arrestor movement limiting transformer neutral point overvoltage；Control gap unit, when occurring power-frequency overvoltage for system, control gap unit disruptive discharge, protection transformer neutral point insulate and arrester；Controller, for being controlled according to the voltage at measurement electric capacity two ends to the trigger action in the control gap of control gap unit；The controller includes：Detection module, is measured for the voltage to measurement electric capacity two ends；Time series stereodata module, for the voltage at the measurement electric capacity two ends to be compared with predetermined voltage threshold, and according to comparative result and time threshold, outputs control signals to switch control module；Switch control module, for being controlled according to institute's control signal to the trigger action for controlling gap, the trigger action includes：Switch closing and switch opening.
Description
Technical field
Dress is protected the present invention relates to tranformer protection field, and more particularly, to a kind of 110kV transformer neutral points
Put and method.
Background technology
For limitation short circuit current in single phase grounding, prevent configuration etc. of adjusting of communication interference and relay protection from requiring, in 110kV
In property point effectively earthed system, some transformers neutral point often takes the earth-free method of operation.In the process of running, in transformer
Property point may bear thunder and lightning, operation, power frequency and resonance overvoltage, the insulation that these overvoltage may be to transformer neutral point
Cause damage.
At present, the earth-free transformer neutral point of China is protected frequently with single rod gap protection, single Zinc-Oxide Arrester
With zero-clearance zinc oxide lightning arrester protection in parallel with rod-rod gap, all asked without the protection for solving transformer neutral point well
Topic.It is primarily present following defect：(1) single rod gap is under lightning impulse effect, and gap breakdown produces wave chopping, jeopardizes transformer
Neutral point insulation；In addition, because portable protective gaps are unable to self arc, it is necessary to by relay protection breaking arc in actual motion, by
This may trigger protective relaying maloperation problem；(2) single metal oxide arrester occurs single-phase short circuit ground connection in system and lost
Easily it is damaged or explodes when ground or open-phase operation；(3) between gapless metal-oxide lighting arrester and rod-rod
Gap is in parallel, because the cooperation between the dielectric level of protection of arrester level, rod gap acting characteristic and transformer neutral point will
Ask very harsh, realize extremely difficult.
Accordingly, it would be desirable to which a kind of 110kV transformer neutral points protection device, thunder and lightning, behaviour are born to solve transformer neutral point
Make, power frequency and resonance overvoltage, the problem of being caused damage to the insulation of transformer neutral point.
The content of the invention
The invention provides a kind of 110kV transformer neutral points protection device and method, arrester is solved in power frequency mistake
Easily caused danger under voltage, gap produced under lightning impulse the gaps such as wave chopping it is in parallel with arrester protection in there is Insulation Coordination
Difficult the problem of, most reliable, complete protection can be provided for 110kV transformer neutral points.
In order to solve the above problems, according to an aspect of the invention, there is provided a kind of 110kV transformer neutral points are protected
Device, described device includes：Arrester, control gap unit and controller,
The arrester, it is in parallel with the control gap unit, under thunder and lightning and switching impulse, lightning arrestor movement to be limited
Transformer neutral point overvoltage processed；
The control gap unit, when occurring power-frequency overvoltage for system, control gap unit disruptive discharge, protection becomes
Depressor neutral point insulation and arrester；The control gap unit includes：First equalizing capacitance module and the second equalizing capacitance mould
Block, the first equalizing capacitance module and the second equalizing capacitance wired in parallel, the first equalizing capacitance module include：The
One equalizing capacitance and fixed interval (FI), the first equalizing capacitance and fixed interval (FI) are in parallel；The second equalizing capacitance module includes：Second
Equalizing capacitance, measurement electric capacity and control gap, second equalizing capacitance are in parallel with control gap after being connected with measurement electric capacity；
The controller, is moved for the voltage according to measurement electric capacity two ends to the triggering in the control gap of control gap unit
It is controlled；The controller includes：Detection module, time series stereodata module and switch control module, the detection mould
Block, is measured for the voltage to measurement electric capacity two ends；The time series stereodata module, for measuring electric capacity two by described
The voltage at end is compared with predetermined voltage threshold, and according to comparative result and time threshold, outputs control signals to switch control
Molding block；The switch control module, it is described to touch for being controlled according to institute's control signal to the trigger action for controlling gap
Work is started to include：Switch closing and switch opening.
Preferably, wherein the arrester is gapless metal-oxide lighting arrester, the rated voltage of arrester is 60kV,
Continuous running voltage is 48kV, and nominal voltage of a system is 110kV, nominal discharge current 1.5kA.
Preferably, wherein the controller also includes：Low-pass filtering module,
The low-pass filtering module, processing is filtered for the voltage to measurement electric capacity two ends.
Preferably, wherein the detection module, time series stereodata module, switch control module and low-pass filtering module envelope
In a cabinet.
There is provided a kind of 110kV transformer neutral points guard method, methods described bag according to another aspect of the present invention
Include：
Under thunder and lightning and switching impulse, lightning arrestor movement limiting transformer neutral point overvoltage is utilized；
When power-frequency overvoltage occurs for system, control gap unit disruptive discharge, protection transformer neutral point insulation are utilized
And arrester；
Controller is controlled according to the voltage at measurement electric capacity two ends to the trigger action in the control gap of control gap unit
System, wherein the trigger action includes：Switch closing and switch opening.
Preferably, wherein the controller according to the voltage at measurement electric capacity two ends to the control gap of control gap unit
Trigger action is controlled, including：
The voltage at measurement electric capacity two ends is measured；
The voltage at the measurement electric capacity two ends Jing Guo low-pass filtering treatment is compared with predetermined voltage threshold, and according to than
Compared with result and time threshold output control signal；
The trigger action for controlling gap is controlled according to institute's control signal.
Preferably, wherein methods described also includes：
Processing is filtered to the voltage at measurement electric capacity two ends.
Preferably, wherein the arrester is gapless metal-oxide lighting arrester, the rated voltage of arrester is 60kV,
Continuous running voltage is 48kV, and nominal voltage of a system is 110kV, nominal discharge current 1.5kA.
The beneficial effects of the present invention are：
Present aspect provides a kind of 110kV transformer neutral points protection device, it is used in combination by control gap with arrester,
Take full advantage of the respective advantage of arrester, gap protection, efficiently solve arrester easily caused danger under power-frequency overvoltage,
Gap, which is produced under lightning impulse in the protection in parallel with arrester of the gaps such as wave chopping, has the problem of Insulation Coordination is difficult, can be
110kV transformer neutral points provide most reliable, complete protection scheme, substantially increase the stability and security of system.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is the structural representation of the 110kV transformer neutral points protection device 100 according to embodiment of the present invention；
Fig. 2 is the schematic diagram of existing transformer neutral point protection device；
Fig. 3 is the schematic diagram of the 110kV transformer neutral points protection device 100 according to embodiment of the present invention；And
Fig. 4 is the flow chart of the 110kV transformer neutral points guard method 300 according to embodiment of the present invention.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and it is to disclose at large and fully there is provided these embodiments to be not limited to embodiment described herein
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing for being illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, is appreciated that and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is the structural representation of the 110kV transformer neutral points protection device 100 according to embodiment of the present invention.Such as
Shown in Fig. 1, the 110kV transformer neutral points protection device 100 is used to protect transformer neutral point, including：It is lightning-arrest
Device 101, control gap unit 102 and controller 103.The 110kV transformer neutral points protection device 100.By control gap
The arrester commonly used with transformer neutral point is used in combination.Under thunder and lightning and switching impulse, in lightning arrestor movement limiting transformer
Property point overvoltage；When the power-frequency overvoltage for threatening transformer neutral point insulation occurs for system, control gap disruptive discharge is reliable to protect
Protect transformer neutral point insulation and arrester.Fig. 2 is the schematic diagram of existing transformer neutral point protection device.As shown in Fig. 2 nothing
The Zinc-Oxide Arrester method in parallel with rod-rod gap in gap is protected to emerging point in transformer, but is due to that arrester is protected
Cooperation between the dielectric level of shield level, rod gap acting characteristic and transformer neutral point requires very harsh, realizes and is stranded very much
It is difficult.The transformer neutral point protection device of the present invention takes full advantage of the respective advantage of arrester, gap protection, efficiently solves
Arrester is easily caused danger under power-frequency overvoltage, gap produces the protection in parallel with arrester of the gaps such as wave chopping under lightning impulse
In there is the problem of Insulation Coordination is difficult, most reliable, complete protection scheme can be provided for 110kV transformer neutral points, significantly
Improve the stability and security of system.
Preferably, the arrester 101, it is in parallel with the control gap unit 102, in thunder and lightning and switching impulse
Under, lightning arrestor movement limiting transformer neutral point overvoltage.Preferably, wherein the arrester is kept away for gapless metal-oxide
Thunder device, the rated voltage of arrester is 60kV, and continuous running voltage is 48kV, and nominal voltage of a system is 110kV, nominal discharge electricity
Flow 1.5kA.
Preferably, the control gap unit 102, when occurring power-frequency overvoltage for system, control gap unit punctures
Electric discharge, the insulation of protection transformer neutral point and arrester.The control gap unit 102 includes：First equalizing capacitance module
1011 and the second equalizing capacitance module 1012, the first equalizing capacitance module and the second equalizing capacitance wired in parallel, institute
Stating the first equalizing capacitance module includes：First equalizing capacitance and fixed interval (FI), the first equalizing capacitance and fixed interval (FI) are in parallel；It is described
Second equalizing capacitance module includes：Second equalizing capacitance, measurement electric capacity and control gap, second equalizing capacitance and measurement electricity
Hold in parallel with control gap after series connection.
Preferably, the controller 103, for control room of the voltage according to measurement electric capacity two ends to control gap unit
The trigger action of gap is controlled.The controller 103 includes：Detection module 1031, time series stereodata module 1032 and open
Close control module 1033.The detection module 1031, is measured for the voltage to measurement electric capacity two ends.The sequential logic
Control module 1032, for the voltage at the measurement electric capacity two ends to be compared with predetermined voltage threshold, and according to comparing knot
Fruit and time threshold, output control signals to switch control module.The switch control module 1033, for according to control letter
Number to control gap trigger action be controlled, the trigger action includes：Switch closing and switch opening.Preferably, wherein the control
Device processed also includes：Low-pass filtering module, the low-pass filtering module is filtered place for the voltage to measurement electric capacity two ends
Reason.Preferably, wherein the detection module, time series stereodata module, switch control module and low-pass filtering module are encapsulated in
In one cabinet.
Fig. 3 is the schematic diagram of the 110kV transformer neutral points protection device 100 according to embodiment of the present invention.Such as Fig. 3 institutes
Show, in embodiments of the present invention, the 110kV transformer neutral points protection device 100 includes：Arrester, control gap
Unit and controller.Arrester control gap unit is in parallel, under thunder and lightning and switching impulse, lightning arrestor movement to limit transformation
Device neutral point overvoltage.When control gap unit is used for system generation power-frequency overvoltage, control gap unit disruptive discharge, protection
Transformer neutral point insulate and arrester.Control gap unit includes：First equalizing capacitance module and the second equalizing capacitance module,
First equalizing capacitance module and the second equalizing capacitance wired in parallel, the first equalizing capacitance module include：First equalizing capacitance and solid
Fixed gap, the first equalizing capacitance and fixed interval (FI) are in parallel；Second equalizing capacitance module includes：Second equalizing capacitance, measurement electric capacity
With control gap, the second equalizing capacitance with measurement electric capacity connect after with control gap it is in parallel, wherein, control gap, measure electric capacity
One device is wrapped in by cabinet shell with the second equalizing capacitance.Controller is used for the voltage according to measurement electric capacity two ends to control gap
The trigger action in the control gap of unit is controlled.Controller includes：Detection module, time series stereodata module, low pass filtered
Ripple module, voltage comparison module, virtual value computing module and switch control module, using detection module to measurement electric capacity two ends
Voltage is measured, and carries out low-pass filtering treatment to the voltage at measurement electric capacity two ends by low-pass filtering module, then to warp
The voltage for crossing the measurement electric capacity of low-pass filtering treatment carries out virtual value calculating by virtual value computing module, obtains measurement electric capacity
Effective voltage, acquisition comparative result is compared in voltage comparison module by the effective voltage and predetermined voltage threshold that measure electric capacity
And sending value time series stereodata module, time series stereodata module passes through logical operation, threshold value to the voltage of collection and when
Between meet require after, output control signals to switch control module, pass through switch control module control gap trigger action, bag
Include：Close a floodgate or separating brake, reliable and complete protection is provided for 110kV transformer neutral points.
Fig. 4 is the flow chart of the 110kV transformer neutral points guard method 300 according to embodiment of the present invention.Such as Fig. 4 institutes
Show, the 110kV transformer neutral points guard method 300 is since step 301 place, in step 401 in thunder and lightning and switching impulse
Under, utilize lightning arrestor movement limiting transformer neutral point overvoltage.Preferably, wherein the arrester aoxidizes for gapless metal
Thing arrester, the rated voltage of arrester is 60kV, and continuous running voltage is 48kV, and nominal voltage of a system is 110kV, is nominally put
Electric current 1.5kA.
Preferably, when in system power-frequency overvoltage occurs for step 402, control gap unit disruptive discharge, protection are utilized
Transformer neutral point insulate and arrester.
Preferably, in step 403 controller according to control gap of the voltage to control gap unit for measuring electric capacity two ends
Trigger action be controlled, wherein the trigger action includes：Switch closing and switch opening.Preferably, wherein the controller according to
The voltage at measurement electric capacity two ends is controlled to the trigger action in the control gap of control gap unit, including：To measurement electric capacity
The voltage at two ends is measured；The voltage at the measurement electric capacity two ends Jing Guo low-pass filtering treatment is compared with predetermined voltage threshold
Compared with, and according to comparative result and time threshold output control signal；The trigger action for controlling gap is entered according to institute's control signal
Row control.Preferably, wherein methods described also includes：Processing is filtered to the voltage at measurement electric capacity two ends.
The 110kV transformer neutral points protection device 100 of embodiments of the invention and an alternative embodiment of the invention
The guard method 400 of 110kV transformer neutral points is corresponding, will not be repeated here.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example in described device, component etc. is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (8)
1. a kind of 110kV transformer neutral points protection device, it is characterised in that described device includes：Arrester, control gap are single
Member and controller,
The arrester, it is in parallel with the control gap unit, under thunder and lightning and switching impulse, lightning arrestor movement limitation to become
Depressor neutral point overvoltage；
The control gap unit, when occurring power-frequency overvoltage for system, transformer is protected in control gap unit disruptive discharge
Neutral point insulation and arrester；The control gap unit includes：First equalizing capacitance module and the second equalizing capacitance module, institute
The first equalizing capacitance module and the second equalizing capacitance wired in parallel are stated, the first equalizing capacitance module includes：First is equal
Voltage capacitance and fixed interval (FI), the first equalizing capacitance and fixed interval (FI) are in parallel；The second equalizing capacitance module includes：Second presses
Electric capacity, measurement electric capacity and control gap, second equalizing capacitance are in parallel with control gap after being connected with measurement electric capacity；
The controller, for being entered according to the voltage at measurement electric capacity two ends to the trigger action in the control gap of control gap unit
Row control；The controller includes：Detection module, time series stereodata module and switch control module, the detection module are used
Measured in the voltage to measurement electric capacity two ends；The time series stereodata module, for by the measurement electric capacity two ends
Voltage is compared with predetermined voltage threshold, and according to comparative result and time threshold, outputs control signals to switch control mould
Block；The switch control module, for being controlled according to institute's control signal to the trigger action for controlling gap, the triggering is dynamic
Work includes：Switch closing and switch opening.
2. device according to claim 1, it is characterised in that the arrester is gapless metal-oxide lighting arrester,
The rated voltage of arrester is 60kV, and continuous running voltage is 48kV, and nominal voltage of a system is 110kV, nominal discharge current
1.5kA。
3. device according to claim 1, it is characterised in that the controller also includes：Low-pass filtering module,
The low-pass filtering module, processing is filtered for the voltage to measurement electric capacity two ends.
4. device according to claim 3, it is characterised in that the detection module, time series stereodata module, switch control
Molding block and low-pass filtering module are encapsulated in a cabinet.
5. a kind of 110kV transformer neutral points guard method, it is characterised in that methods described includes：
Under thunder and lightning and switching impulse, lightning arrestor movement limiting transformer neutral point overvoltage is utilized；
When power-frequency overvoltage occurs for system, using control gap unit disruptive discharge, protection transformer neutral point insulate and kept away
Thunder device；
Controller is controlled according to the voltage at measurement electric capacity two ends to the trigger action in the control gap of control gap unit, its
Described in trigger action include：Switch closing and switch opening.
6. method according to claim 5, it is characterised in that the controller can according to the voltage pair at measurement electric capacity two ends
The trigger action for controlling the control gap of gap element is controlled, including：
The voltage at measurement electric capacity two ends is measured；
The voltage at the measurement electric capacity two ends Jing Guo low-pass filtering treatment is compared with predetermined voltage threshold, and according to comparing knot
Fruit and time threshold output control signal；
The trigger action for controlling gap is controlled according to institute's control signal.
7. method according to claim 6, it is characterised in that methods described also includes：
Processing is filtered to the voltage at measurement electric capacity two ends.
8. method according to claim 5, it is characterised in that the arrester is gapless metal-oxide lighting arrester,
The rated voltage of arrester is 60kV, and continuous running voltage is 48kV, and nominal voltage of a system is 110kV, nominal discharge current
1.5kA。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710482423.5A CN107276061A (en) | 2017-06-22 | 2017-06-22 | A kind of 110kV transformer neutral points protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710482423.5A CN107276061A (en) | 2017-06-22 | 2017-06-22 | A kind of 110kV transformer neutral points protection device and method |
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| Publication Number | Publication Date |
|---|---|
| CN107276061A true CN107276061A (en) | 2017-10-20 |
Family
ID=60068153
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|---|---|---|---|
| CN201710482423.5A Pending CN107276061A (en) | 2017-06-22 | 2017-06-22 | A kind of 110kV transformer neutral points protection device and method |
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Cited By (3)
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| CN110854809A (en) * | 2019-11-11 | 2020-02-28 | 深圳供电局有限公司 | Detection method of transformer neutral point protection device and protection device |
| CN111030049A (en) * | 2019-11-19 | 2020-04-17 | 深圳供电局有限公司 | Transformer neutral point protection method and device |
| CN114498304A (en) * | 2021-11-30 | 2022-05-13 | 河北择东电气有限公司 | Intelligent protection equipment and protection method for controllable gap of transformer neutral point mechanism |
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