CN105048437B - A kind of combined type neutral ground composite control apparatus - Google Patents
A kind of combined type neutral ground composite control apparatus Download PDFInfo
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- CN105048437B CN105048437B CN201510565558.9A CN201510565558A CN105048437B CN 105048437 B CN105048437 B CN 105048437B CN 201510565558 A CN201510565558 A CN 201510565558A CN 105048437 B CN105048437 B CN 105048437B
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Abstract
A kind of combined type neutral ground composite control apparatus, belongs to electric power network automation field；The technical problem to be solved in the present invention is to provide one kind capable of greatly improving network voltage Comprehensive Control level, improves the combined type neutral ground composite control apparatus of operation of power networks reliability；Its technical solution is：A kind of combined type grounding control device is set in transformer or generator neutral point, including protection branch (1), protection branch (2), protection branch (3) and Comprehensive Control unit (7).The CPU primary control programs of Comprehensive Control unit (7) control three protection branches; it is realized according to supply network overvoltage duration, wave head steepness, energy size, voltage parameter and the step of power network overvoltage is controlled; using the protection scheme step by step such as pressure limiting, Energy suppression, low resistance grounding; each layer protection is coordinated step by step according to voltage parameter, time parameter, energy parameter, is formed and is controlled the step of network voltage.
Description
Technical field
The present invention relates to a kind of neutral earthing devices of electric power network, more particularly, to 3~66kV medium-pressure electricity supply networks,
The power supply reliability of power grid can be greatly improved, ensures a kind of combined type neutral point integrated control device of electrical equipment safety.
Background technology
It is more universal with tri- voltage class applications of 6kV, 10kV, 35kV in China's 3~66kV medium voltage networks, in recent years,
With the development of supply network, a large amount of uses of vacuum circuit breaker are increasingly increased, electric arc furnaces, change using the user of cable run
The use of the power equipments such as frequency device, high-voltage thyristor also increases increasingly, causes the fluctuation of network voltage very frequent, because of power supply
The phenomenon that network voltage fluctuates and causes the system failure is more and more frequent, causes the damage of power transmission and transforming equipment, influences the life of enterprise
Production, direct or indirect economic loss is brought to enterprise.Especially industrial and mining enterprises mostly use greatly cable power supply so that system is single-phase
Earthing capacitance current greatly increases, and system is more due to the accident that single-phase intermittent arc earthing occurs and electrical equipment is caused to damage
There is generation.
In order to solve the problems, such as the overvoltage injury generated during power network development, for different power system operating modes, electricity
The protection control program of net overvoltage is also developing therewith.It is domestic at present compared with frequently with power system operating mode include mainly three
Kind：1) the isolated neutral method of operation, 2) the neutral by arc extinction coil grounding method of operation, 3) Neutral Point Through Low Resistance
The method of operation.
The isolated neutral method of operation：Medium voltage network isolated neutral, the country's 3~66kV medium-pressure electricity supply networks are most
Number use this method of operation, the overvoltage protection to supply network be by zinc oxide surge arresters, combination overvoltage protector,
Arc-extinguishing resonance-extinguishing device carries out the protection of system overvoltage.But traditional arrester is merely capable of preventing the opposite of lightning stroke generation
Ground overvoltage can not solve the problems, such as the alternate overvoltage of system；And combination overvoltage protector can limit simultaneously relatively,
Alternate overvoltage, but it is extremely limited to absorb energy, so, it is merely able to absorb instantaneity overvoltage and limits, for resonance, single-phase
The long-time overvoltage of the generations such as ground connection can not be born, and even result in the explosion of protector；And arc-extinguishing resonance-extinguishing device is mainly needle
Intermittent arc grounding is sent to system and is arranged, principle is that the failure phase direct metal ground connection of arc grounding will occur,
Although this protection scheme is simple, system needs the phase-deficient operation of long period；Particularly duration is not grown excessively electric
Pressure can cause the single-phase earthing of long period, make power supply although eliminating system arc overvoltage by Single Phase Metal ground connection
System operates with failure, and makes fault spread.
The method of operation of neutral by arc extinction coil grounding：Medium voltage network neutral point passes through grounding through arc, this fortune
Line mode is larger primarily directed to system capacitive earth current, the problem of may leading to intermittent arc grounding overvoltage, mainly
Principle is that poor 180 ° of the principle in phase compensates the capacitance current of system with capacitance current using inductive current.Due to
The randomness of the diversification of power system operating mode and arc grounding point, arc suppression coil will carry out effective compensation right and wrong to capacitance current
Often difficult；In addition arc suppression coil is merely able to compensate power-frequency overvoltage, helpless for higher-order of oscillation overvoltage.Cause
The compensation protection scheme of this arc suppression coil is merely capable of reducing arc grounding odds, can not prevent intermittent arc light and connect
The generation on ground.Even if capacity current can be fully compensated in the inductance current of arc suppression coil, neutral point displacement voltage Uo will be very high, cross and mend
The mode of repaying can reduce neutral point displacement voltage, but detuning degree is big, and line-to-ground electric current will be made too big, and electric arc is not easy to extinguish, that
It still will appear that arc light cannot go out certainly and overvoltage problem, arc overvoltage still have.
The method of operation of Neutral Point Through Low Resistance：Medium voltage network neutral point passes through low resistance grounding, this operation side
Using more, recent year industrial and mining enterprises power supply system uses more and more in the formula U.S., and cardinal principle is power grid neutrality
Point passes through low resistance grounding, using the earth current for artificially increasing fault point when single-phase earthing occurs, utilizes zero sequence excess current
Protection makes breaker instantaneous trip faulty line.This protection scheme accuracy is high, and protection is reliable, and major defect is：It is first
First, when singlephase earth fault occurs, it is permanent or instantaneity that cannot be distinguished, and metallic ground also cannot be distinguished still
Intermittent arc grounding acts on tripping, and the tripping times of circuit is made to greatly increase, and has seriously affected the normal confession of user
Electricity makes the reliability decrease of power supply.Secondly as the electric current of earth point is larger, when zero-sequenceprotection action is not in time or when tripping,
Earth point and neighbouring insulation will be made to be endangered by bigger, lead to phase fault.
The utility model patent of patent No. ZL2010201575037 discloses a kind of non-linear neutral point earthing resistor, packet
At least one set is included by high energy ZnO valve block group A and the component constituted with the high energy ZnO valve block group A fuses being in series.Its
Principle is to realize the inhibition being mutated to system voltage, absorption system voltage jump using the nonlinear characteristic of high energy ZnO resistors
When the overvoltage energy that generates.Relatively high, confession that this technical reduces the linear resistance earthing tripping frequencies of neutral point
The poor problem of electric continuity, but new problem is brought simultaneously, the linear resistance that low resistance grounding uses utilizes neutral point
Earth current makes breaker instantaneous trip faulty line by zero sequence excess current protection, and nonlinear resistance is to utilize zinc oxide electricity
The non-linear realization of resistance limits overvoltage, while the big energy that can hold to voltage jump for passing through high energy ZnO nonlinear resistance
Amount is absorbed.The technology thinks that the energy capacity of high energy ZnO nonlinear resistance is set according to the 300% of system energy capacity
Meter, but the energy capacity for not talking about system is how many on earth, it is well known that the energy and voltage of electric system, electric current, time
Directly proportional, system overvoltage duration is indefinite, such as intermittent arc grounding, it may be possible to instantaneous, it is also possible to it holds
Continuous a few minutes, it is also possible to which long-term existence, due to not knowing for overvoltage duration, the ceiling capacity of overvoltage may be considered
Infinity, and the energy of nonlinear resistance can not possibly be designed as infinity, then, so-called 300% is just nonsensical, once mistake
The energy of voltage bears energy beyond the design of high energy ZnO nonlinear resistance, may result in the breakdown of ZnO resistors, into
And heat accumulation, thermal runaway is formed, although increasing fuse in the patented technology of patent No. ZL2010201575037 to protect height
Energy znr, but exiting for znr, can make the device can not work normally.
In conclusion the problem of for system overvoltage, three kinds of first methods of operation and known solution are all
There is various problems, lack the comprehensive of protection and the unified of network system considered, can not accomplish protection it is comprehensive, can
By the harmony of property and security of system.
Invention content
The purpose of the present invention is exactly to be provided a kind of according to supply network to solve the shortcoming of above-mentioned technical proposal
Overvoltage duration length, amplitude size, energy size are respectively combined the Global Macros device of formula processing, especially logical
The comprehensive control of a kind of combined type ground connection handled step by step supply network overvoltage is realized in the comprehensive control for crossing neutral ground
Device processed, the device can greatly improve network voltage Comprehensive Control level, improve the reliability of operation of power networks.Neutral ground
Composite control apparatus organically combines power monitoring technology, voltage change analytical technology, voltage control technology, realization pair
The comprehensively monitoring of network voltage and protection change various problems present in first technology, make network voltage protection control by
Decentralized supervisory control rises to integrated protection, and the concept that network voltage controls is made greatly to be extended in breadth and depth, into
One step has expanded the specific aim and applicability of network voltage monitoring protection, and General Promotion network voltage monitors the synthesis of protection automatically
It is horizontal.
The technical scheme adopted by the invention to solve the technical problem is that：A kind of combined type neutral ground Comprehensive Control dress
It sets, can realize the limitation and protection to the various overvoltage of supply network, including three protection branches：By compression limiter (4), electricity
Flow the protection branch (1) that signal element I (10) is formed；By Energy suppression unit (5), current signal unit II (8), current limliting fusing
The protection branch (2) of device (11) composition；The guarantor being made of ground unit (6), current signal unit III (9), fling-cut switch (12)
Protect branch (3)；With a Comprehensive Control unit (7).The compression limiter (4), Energy suppression unit (5), ground unit (6) point
Not according to the overvoltage duration, wave head steepness, amplitude size, energy size realize step by step, comprehensive control and protection,
Each protection location passes through the physical characteristic of itself and Comprehensive Control unit (7) on voltage parameter, time parameter, energy parameter
Centralized control realize combination the step protection cooperation of formula, to realize that the entirety to supply network controls.
Protection branch (1), protection branch (2), protection branch (3) in the used technical solution of the present invention are installed in parallel,
End of incoming cables after parallel connection is electrically connected by fling-cut switch (13) with the neutral point of transformer or generator, lower end be electrically connected
It connects.
Protection branch (1) in the used technical solution of the present invention includes compression limiter (4), current signal unit I (10),
The compression limiter (4), current signal unit I (10) are connected in series with.Compression limiter (4) is by high-pressure oxidation zinc nonlinear resistance
The direct current 1mA voltage parameters of composition, high-pressure oxidation zinc nonlinear resistance are arranged according to the insulation tolerance of electrical equipment, protection
A current signal unit I (10) is arranged in branch (1), and current signal unit I (10) and Comprehensive Control unit (7) communication connection are real
Existing centralized control.First effect of protection branch (1) is to carry out primary limitation to system overvoltage using compression limiter (4),
And overvoltage energy is absorbed, the instantaneity overvoltage big especially for amplitude, wave head is steep is stronger using high-pressure oxidation zinc valve block
Impact resistance over-voltage amplitude, mitigate overvoltage wave head steepness, be entire protection scheme the first order protection, protect
The safety for demonstrate,proving electrical equipment ensures the reliability of power supply；Second effect is to realize this unit using current signal unit I (10)
Remote monitoring realizes the cooperation of system protections at different levels, is monitored to the working condition of protection branch (1), while being entire system
Step cooperation, the whole control of system provide parameter foundation, ensure effective cooperation of entire protection system.
Protection branch (2) in the used technical solution of the present invention includes limiting fuse (11), Energy suppression unit
(5), current detecting unit (8), the limiting fuse (11), Energy suppression unit (5), current detecting unit (8) series connection
Connection.Energy suppression unit (5) is made of high energy ZnO nonlinear resistance, the direct current 1mA voltages ginseng of Energy suppression unit (5)
Examine the direct current 1mA voltage reference voltages 20% that voltage is higher than compression limiter (4)；The residual voltage ratio of Energy suppression unit (5) is less than limit
Press the residual voltage ratio 20% of unit (4)；The non-linear spy of the Nonlinear Characteristic Curve and compression limiter (4) of Energy suppression unit (5)
Linearity curve realizes intersection in 100A；The energy ability to bear of Energy suppression unit (5) is according to guarantee all electricity consumptions of supply network
One period T of equipment safety operation0Setting, the period T0It is configured according to the cooperation needs of entire protection system.It protects
It protects branch (2) and a current signal unit II (8) is set, current signal unit II (8) passes through telemetry circuit and Comprehensive Control list
First (7) communication connection, realizes centralized control.Protection branch (2) also sets up a limiting fuse (11), when protection branch (2)
In Energy suppression unit (5) electric current reach I0When, limiting fuse (11) fusing, protection Energy suppression unit (5) carries simultaneously
Comprehensive Control unit (7) is given for signal, protects branch (3) to run by control, realizes low resistance grounding, it is mutual using zero-sequence current
Sensor realizes the tripping of faulty line.It is to have overvoltage to occur in system and exceed protection to protect first effect of branch (2)
The overvoltage energy generated to power supply system when the design ability to bear of branch (1) reabsorbs；Second effect is to pass through
Current signal unit II (8) realizes the remote monitoring of this unit, realizes the cooperation of system protections at different levels, to protection branch (2)
Working condition is monitored, while providing parameter foundation for the cooperation of the step of whole system, whole control, ensures entire protection system
Effective cooperation of system.
Protection branch (3) in the used technical solution of the present invention includes high-speed switch (12), ground unit (6), electric current
Signal element III (9), the high-speed switch (12), ground unit (6), current signal unit III (9) are connected in series with.Ground connection
Unit (6) is made of linear resistance, and the parameter of linear resistance is arranged according to neutral point by the requirement of low resistance grounding.Protection branch
Road (3) is provided with high-speed switch (12), realizes the switching to ground unit (6), high-speed switch (12) actuation time T1According to guarantor
Protect branch (2) design and operation time T050% setting.Protect branch (3) that a current signal unit III (9), electric current are set
Signal element III (9) is connected by telemetry circuit and Comprehensive Control unit (7) communication, realizes centralized control.Protect branch (3)
First effect be system occur overvoltage, the duration beyond protection branch (2) design and operation time T050%
When, or when limiting fuse (11) fusing in protection branch (2), by the input of high-speed switch (12), pass through be grounded it is single
First (6) realize low resistance grounding, and the tripping of faulty line is realized using zero sequence current mutual inductor；Second effect is to pass through electric current
Signal element III (9) realizes the remote control of this unit, realizes the cooperation of system protections at different levels, the work to protection branch (3)
Situation is monitored, while providing parameter foundation for the cooperation of the step of whole system, whole control, ensures entire protection system
Effectively cooperation.
The operation principle of the used technical solution of the present invention is：Setting protection branch (1), protection branch (2) and protection branch
Road (3), the parameters such as amplitude, wave head steepness, duration when being generated respectively according to overvoltage using three protection branches are to supplying
The overvoltage that electric system generates carries out step protection, when overvoltage occurs, protects branch (1) to put into operation first, passes through protection
The compression limiter (4) of branch (1) realizes the limitation to overvoltage, ensures that energy is born in insulation of the network voltage no more than electrical equipment
Power, since compression limiter (4) absorbs finite energy, the time for bearing overvoltage is arranged within 20ms.Compression limiter (4) is main
It is protected for instantaneity overvoltage, instantaneity overvoltage such as lightning surge, switching overvoltage etc. can be limited.Lead to simultaneously
The Parameter analysis that current signal unit I (10) is acquired in three-phase voltage parameter, residual voltage parameter, protection branch (1) is crossed to judge,
Judge the type of overvoltage and energy size, when having served as design of the voltage energy beyond protection branch (1) and bearing energy, protection branch
It puts into operation on road (2).By protecting the Energy suppression unit (5) of branch (2) to carry out the inhibition of energy to overvoltage, ensure simultaneously
System voltage is no more than safety value, since system capacity is that protected power grid conveys energy, relationship proportional to the time, institute
With, Energy suppression unit (5) to bear the time not be infinite, the situation and system of overvoltage are generated according to the supply network
The needs of protection are configured, and the time is born in comprehensive factors, the designs of Energy suppression unit (5) such as technological requirement, cost weighed
T0No more than 10 minutes.Simultaneously by current signal unit II (8) acquire protection branch (2) current parameters, to overvoltage into
Row judges again.If energy is born in setting of the overvoltage energy beyond protection branch (2) namely the duration of overvoltage is more than
Time T is born in Energy suppression unit (5) design050% when, then protect branch (3) to put into operation, it is real to pass through ground unit (6)
The neutral grounding by small resistance of existing power supply system, the tripping of faulty line is realized using zero sequence current mutual inductor, ensures power grid electricity
Pressure does not cause damages to the electrical equipment of system, power transmission and transforming equipment.
The beneficial effects of the invention are as follows：By protecting branch (1), protection branch (2), protection branch (3) to realize to power supply
The step of network overvoltage controls, and according to acquisition, analysis, the judgement of system voltage parameter and protective current parameter at different levels, judges
The parameters such as duration, wave head steepness, amplitude size, the energy size of overvoltage, it is comprehensive that knockdown step is used to handle
Protection scheme, each layer protection are coordinated according to parameter setting, time setting, energy coordination etc., are solved in first technology step by step
The isolated neutral method of operation, the neutral point grounding through arc method of operation, the neutral grounding by small resistance method of operation exist
Various problems.Relative to the method for operation of isolated neutral and neutral point grounding through arc, the reliability of protection is significantly
It improves；Relative to the method for operation of neutral grounding by small resistance, it is poor to overcome low resistance grounding tripping frequency height, power supply continuity
The problem of.
Description of the drawings
Fig. 1 is the circuit diagram of the present invention；
Fig. 2 is the protection branch combinations figure of the present invention；
Fig. 3 is the flow diagram of master control program of the present invention；
Specific implementation mode
As shown in the circuit diagram of Fig. 1, the protection branch combinations figure of Fig. 2, a kind of combined type neutral ground synthesis control
Device processed, including protection branch (1), protection branch (2), protection branch (3), Comprehensive Control unit (7)；It protects branch (1), protect
It protects after the end of incoming cables electrical connection of branch (2), protection branch (3) through fling-cut switch (13) and transformer or the neutral point of generator
Electrical connection；Protection branch (1), protection branch (2) are electrically connected after protecting the leading-out terminal of branch (3) to be electrically connected with ground.Form three
It is connected between transformer or the neutral point and ground of generator by fling-cut switch (13) after protection branch circuit parallel connection.
Protection branch combinations figure as shown in Figure 2, protection branch (1) includes compression limiter (4) and current signal unit I
(10), compression limiter (4) is connected in series with current signal unit I (10), and the end of incoming cables of compression limiter (4) passes through fling-cut switch
(13) it is electrically connected with the neutral point of transformer or generator, leading-out terminal and current signal unit I (10) inlet wire of compression limiter (4)
End electrical connection, the leading-out terminal of current signal unit I (10) be electrically connected, the secondary side and synthesis of current signal unit I (10)
Control unit (7) communication connection.
Protection branch combinations figure as shown in Figure 2, protection branch (2) includes limiting fuse (11), Energy suppression unit
(5), (8) current signal unit II, the limiting fuse (11), Energy suppression unit (5), current signal unit II (8)
It is connected in series with, the end of incoming cables of limiting fuse (11) is electrically connected by fling-cut switch (13) and the neutral point of transformer or generator
It connects, the leading-out terminal of limiting fuse (11) is electrically connected with the end of incoming cables of Energy suppression unit (5), and Energy suppression unit (5) go out
Line end is electrically connected with current signal unit II (8) end of incoming cables, the leading-out terminal of current signal unit II (8) be electrically connected, electric current
The secondary side of signal element II (8) is connected with Comprehensive Control unit (7) communication.
Protection branch combinations figure as shown in Figure 2, protection branch (3) include high-speed switch (12), ground unit (6), electricity
Signal element III (9) is flowed, the high-speed switch (12), ground unit (6), current signal unit III (9) are connected in series with, soon
The end of incoming cables of speed switch (12) is electrically connected by fling-cut switch (13) with the neutral point of transformer or generator, high-speed switch (12)
Leading-out terminal is electrically connected with the end of incoming cables of ground unit (6), the leading-out terminal of ground unit (6) and going out for current signal unit III (9)
Line end be electrically connected, the leading-out terminal of current signal unit III (9) be electrically connected, the secondary side of current signal unit III (9) and
Comprehensive Control unit (7) communication connection.
As shown in Figure 1 and Figure 2, Comprehensive Control unit (7) passes through signal transmission line and current signal unit II (8), electric current
Signal element III (9), current signal unit I (10) communication connection.
As shown in figure 3, being a primary control program flow diagram of Comprehensive Control unit (7).Comprehensive Control unit (7) exists
Enter [network voltage detection] after initialization, to the voltage real-time monitoring of power supply grid；Subsequently into [whether there is or not overvoltage], judge
Whether there is or not overvoltage generations for system, if [whether there is or not overvoltage] is judged as N, return [network voltage detection], if [whether there is or not excessively electric
Pressure] it is judged as Y, into [protection branch 1 is run], system overvoltage is limited, is simultaneously emitted by alarm and uploading detection ginseng
Number；Enter [1 electric current of branch time-out] by [protection branch 1 run], by judgement protect branch (1) size of current and it is lasting when
Between, judge the size of system overvoltage, if [1 electric current of branch time-out] is judged as N, returns to [network voltage detection], if
[1 electric current of branch time-out] is judged as Y, and into [protection branch 2 is run], protection branch (2) puts into operation, is simultaneously emitted by alarm simultaneously
Uploading detection parameter；Enter [2 electric current of branch time-out] by [protection branch 2 is run], protects the electric current of branch (2) big by judgement
The small and duration judges the size of system overvoltage, if [2 electric current of branch time-out] is judged as N, returns to [network voltage
Detection], if [2 electric current of branch time-out] is judged as Y, into [protection branch 3 is run], while into [alarm] and [in parameter
It passes]；[protection branch 3 is run] enters [3 electric current of branch is exceeded], judges to protect whether the electric current of branch 3 is more than established standards, such as
Fruit [3 electric current of branch is exceeded] is judged as Y, into [faulty line tripping], while entering [alarm] and [parameter upload]；If
[3 electric current of branch is exceeded] is judged as N, then enters [parameter upload/alarm], and subsequently into being returned to after [system reset], [power grid is electric
Pressure detection].
Claims (1)
1. a kind of combined type neutral ground composite control apparatus, including protection branch (1), protection branch (2), protection branch
(3) and Comprehensive Control unit (7), it is characterised in that：The protection branch (1), protection branch (2), protection branch (3) are in parallel
Connection, it is in parallel after end of incoming cables be electrically connected with the neutral point of transformer or generator by fling-cut switch (13), leading-out terminal and
Ground is electrically connected, and Comprehensive Control unit (7) is to three protection branch communication connections；
The protection branch (1) includes compression limiter (4) and current signal unit I (10), the compression limiter (4) and electric current
Signal element I (10) sequences are electrically connected, and compression limiter (4) is made of high-pressure oxidation zinc nonlinear resistance, and high-pressure oxidation zinc is non-thread
Property resistance direct current 1mA voltage parameters according to electrical equipment insulation tolerance be arranged；
The protection branch (2) includes limiting fuse (11), Energy suppression unit (5), current signal unit II (8), described
Limiting fuse (11), Energy suppression unit (5), current signal unit II (8) sequence be electrically connected, Energy suppression unit (5)
It is made of high energy ZnO nonlinear resistance, the direct current 1mA voltage reference voltages of Energy suppression unit (5) are higher than compression limiter
(4) direct current 1mA voltage reference voltages 20%；The residual voltage ratio of Energy suppression unit (5) is less than the residual voltage ratio of compression limiter (4)
20%；The Nonlinear Characteristic Curve of Energy suppression unit (5) and the Nonlinear Characteristic Curve of compression limiter (4) are realized in 100A
Intersect；When the energy ability to bear of Energy suppression unit (5) is according to all electrical equipment safe operations of supply network one are ensured
Between section T0Setting, the period T0It is configured according to the cooperation needs of entire protection system, the energy in protection branch (2)
Amount inhibits unit (5) electric current to reach I0When, limiting fuse (11) fusing, protection Energy suppression unit (5), while signal being provided
Comprehensive Control unit (7) is given, protects branch (3) to run by control, realizes low resistance grounding, utilizes zero sequence current mutual inductor reality
The tripping of existing faulty line；
The protection branch (3) includes high-speed switch (12), ground unit (6), current signal unit III (9), and described is quick
(12), ground unit (6), current signal unit III (9) sequence electrical connections are switched, ground unit (6) is made of linear resistance,
The parameter of linear resistance is arranged according to neutral point by the requirement of low resistance grounding, and high-speed switch (12) is realized to ground unit
(6) switching, high-speed switch (12) actuation time T1According to protection branch (2) design and operation time T050% setting；
The Comprehensive Control unit (7) and the current signal unit I (10) of protection branch (1), the current signal of protection branch (2)
The current signal unit III (9) of unit II (8) and protection branch (3) communication connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565558.9A CN105048437B (en) | 2015-09-03 | 2015-09-03 | A kind of combined type neutral ground composite control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565558.9A CN105048437B (en) | 2015-09-03 | 2015-09-03 | A kind of combined type neutral ground composite control apparatus |
Publications (2)
| Publication Number | Publication Date |
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| CN105048437A CN105048437A (en) | 2015-11-11 |
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| CN109581038A (en) * | 2018-11-27 | 2019-04-05 | 国家电网有限公司 | Electric power plug socket lightning protection control method, system and slave computer |
| CN111030049B (en) * | 2019-11-19 | 2022-04-26 | 深圳供电局有限公司 | Transformer neutral point protection method and device |
| CN111308276B (en) * | 2020-04-08 | 2021-10-08 | 广东电网有限责任公司电力调度控制中心 | Power distribution network fault positioning method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064528A (en) * | 2009-11-13 | 2011-05-18 | 西安神电电器有限公司 | Transformer neutral point earth protection device |
| CN102709881A (en) * | 2012-03-15 | 2012-10-03 | 东北电力科学研究院有限公司 | Device utilizing adjustable resistance method to curb DC of neutral point of transformer |
| CN202712836U (en) * | 2012-06-08 | 2013-01-30 | 上海市电力公司 | Grounded-neutral system |
| CN203151088U (en) * | 2013-03-31 | 2013-08-21 | 国家电网公司 | A single-phase ground fault isolation device |
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | A 10 kV power grid neutral point grounding device |
| CN205178493U (en) * | 2015-09-03 | 2016-04-20 | 芜湖科越电气有限公司 | Modular neutal point earthing composite control device |
-
2015
- 2015-09-03 CN CN201510565558.9A patent/CN105048437B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064528A (en) * | 2009-11-13 | 2011-05-18 | 西安神电电器有限公司 | Transformer neutral point earth protection device |
| CN102709881A (en) * | 2012-03-15 | 2012-10-03 | 东北电力科学研究院有限公司 | Device utilizing adjustable resistance method to curb DC of neutral point of transformer |
| CN202712836U (en) * | 2012-06-08 | 2013-01-30 | 上海市电力公司 | Grounded-neutral system |
| CN203151088U (en) * | 2013-03-31 | 2013-08-21 | 国家电网公司 | A single-phase ground fault isolation device |
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | A 10 kV power grid neutral point grounding device |
| CN205178493U (en) * | 2015-09-03 | 2016-04-20 | 芜湖科越电气有限公司 | Modular neutal point earthing composite control device |
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