CN207319825U - A kind of arrester of built-in current mutual inductor - Google Patents
A kind of arrester of built-in current mutual inductor Download PDFInfo
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- CN207319825U CN207319825U CN201721505104.3U CN201721505104U CN207319825U CN 207319825 U CN207319825 U CN 207319825U CN 201721505104 U CN201721505104 U CN 201721505104U CN 207319825 U CN207319825 U CN 207319825U
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Abstract
A kind of arrester of built-in current mutual inductor is the utility model is related to, belongs to arrester on-line monitoring technique field.Technical solution is：Current transformer (10) is cased with outside insulating cylinder or insulation plastic structure (3)；The outside of current transformer (10) is equipped with exterior insulation (2)；The current transformer output line (11) of current transformer (10), is connected with the current transformer output signaling interface (12) on lower flange (5).The current transformer output interface, is connected with externally measured meter or arrester on-line monitoring instrument.The utility model is not on the premise of the performance parameters and agent structure of arrester are changed, exclude to influence the factor of leakage current of an arrester measurement accuracy and reliability under working voltage, realize the accurate measurement to leakage current of an arrester under working voltage, simplify arrester installation form, reduce installing component, the reliability and accuracy of lifting arrester on-line monitoring.
Description
Technical field
The utility model is related to a kind of arrester of built-in current mutual inductor, for prevent electric system lightning surge and
Arrester is monitored on-line, belongs to arrester and its on-line monitoring technique field.
Background technology
Arrester is very important a kind of overvoltage protection equipment in electric system, for preventing electric system thunder and lightning mistake
Voltage.Because with nonlinear factor is small, protection feature is good, energy absorption capability is strong, through-current capability is big, simple in structure and stable
The advantages that property is good, Zinc-Oxide Arrester is most widely used at present.The structure of Zinc-Oxide Arrester is generally as shown in Figure 1.Figure
In, 1 is upper flange, and metal material is conductive；2 be exterior insulation, generally porcelain or silicon rubber；3 is cementing for insulating cylinder or insulation
Structure, while strengthening insulating, increases structural strength；4 are superimposed the arrester spool to be formed for zinc oxide valve plate；15 be electrode,
Metal material, it is conductive, connect arrester spool and lower flange；5 be lower flange, and metal material is conductive.
During normal operation, Zinc-Oxide Arrester accesses electric system by upper flange, and grounded screen is accessed by lower flange.Oxygen
Changing zinc valve block has extremely superior nonlinear characteristic.Zinc oxide valve plate resistance value is very high under normal working voltage, is similar to one
A insulator, flows through the electric current very little of arrester spool.And under overvoltage effect, the resistance of zinc oxide valve plate becomes very little,
Lightning current can flow into the earth by spool.
The defects of arrester is common is valve block aging and makes moist.After these defects occur for arrester, most typical feature
It is the leakage current increase that valve block is flowed through under working voltage, the resistive component of particularly leakage current is sensitiveer and accurate.《Electricity
Power equipment preventive trial code》（DL/T 596）Regulation, " ac leakage current under working voltage, measured value and initial value ratio
Relatively having should strengthen monitoring during significant change, and when current in resistance property increases by 1 times, should have a power failure inspection ".Leakage current is complete under working voltage
The test of electric current and current in resistance property, can be completed by the method for live testing.But live testing is periodically to carry out, it is impossible to
The data of real-time monitoring leakage electric current.Therefore Zinc-Oxide Arrester, which generally all coordinates, is mounted with that On-line Monitoring of Leakage Current instrument is made
For on-line monitoring, specific installation method is as shown in Figure 2.In figure, 1 is upper flange, and metal material is conductive；2 be exterior exhausted
Edge, generally porcelain or silicon rubber；3 be insulating cylinder or insulation plastic structure, while strengthening insulating, increases structural strength；4 are
Arrester spool, is superimposed by zinc oxide valve plate and is formed；5 be lower flange, and metal material is conductive；15 be electrode, and metal material, leads
Electricity, connects arrester spool and lower flange；6 be supporting insulator, non-conductive；7 be arrester framework, is used to support arrester,
Material is generally cement or steel；8 be down conductor, and metal material is conductive, connects grounded screen；9 be leakage current of an arrester
On-line monitoring instrument.13 be metallic conductor, and leakage current is introduced arrester discharge current on-line monitoring from arrester lower flange 5
Instrument 9.During normal operation, under the action of working voltage, leakage current flow to lower flange from arrester spool 4 by electrode 15
5.Since supporting insulator 6 is non-conductive, leakage current can only flow to leakage current of an arrester on-line monitoring by metallic conductor 13
Instrument 9.Leakage current of an arrester on-line monitoring instrument 9, leakage current numerical value is shown according to the electric current flowed through.Leakage current flows through
After leakage current of an arrester on-line monitoring instrument 9, by down conductor 8, grounded screen is flowed into.Leakage current of an arrester is supervised online
Leakage current is surveyed under the arrester working voltage that instrument 9 is shown, it is necessary to operation maintenance personnel is periodically made a copy of, compared and judged, according to
It can not so realize real-time monitoring.Then occur the leakage current of an arrester on-line monitoring instrument with communication function again, pass through
The leakage current numerical value measured is sent to host computer and calculate and judge in real time by communication function.There is a method in which just
It is to increase a core through type current transformer in fig 2, allows 13 punching of metallic conductor to utilize electricity by this current transformer
The electric current in metallic conductor 13 is flowed through in current transformer measurement, and current transformer output current incoming communication module is simultaneously sent to upper
Machine calculate and judge in real time.
There is solid for leakage current of an arrester on-line monitoring method under above-mentioned arrester structure and corresponding working voltage
The problem of having.The premise that above-mentioned method can normally, accurately measure leakage current of an arrester under working voltage is to flow through gold
The electric current of category conductor 13 and leakage current of an arrester on-line monitoring instrument 9 and the electric current for flowing through arrester spool 4 are completely the same.But
In real work, but there is some disturbing factors, most important of which is that the insulation characterisitic and exterior insulation of supporting insulator 6
2 filthy situation.If the insulation characterisitic of supporting insulator 6 is bad, shunting can be produced, causes to flow through metallic conductor 13 and takes shelter from the thunder
The electric current of device On-line Monitoring of Leakage Current instrument 9 and the electric current for flowing through arrester spool 4 are inconsistent.Arrester exterior insulation 2
A degree of filth is generally had on outer surface, under the action of arrester working voltage, electric current is had and flows through exterior insulation 2
Outer surface, be generally called filthy electric current.Under normal circumstances, filthy more pollution severity electric current is bigger, particularly in sleet sky
Under gas, filthy electric current can often reach very high numerical value.Filthy electric current finally also will flow through metallic conductor by lower flange 5
13 and leakage current of an arrester on-line monitoring instrument 9, cause to flow through metallic conductor 13 and leakage current of an arrester on-line computing model
The electric current of table 9 and the electric current for flowing through arrester spool 4 are inconsistent.Attached drawing 3 is the equivalent circuit diagram of the above problem.R in figure1To keep away
The equivalent resistance of thunder device zinc oxide spool 4, R2For the equivalent resistance that exterior insulation 2 is filthy, R3For the equivalent electric of supporting insulator 6
Resistance, 9 be leakage current of an arrester on-line monitoring instrument, I1To flow through the electric current of arrester spool 4, I2To flow through outside arrester
Insulate the filthy electric current on 2 surfaces, I3To flow through the electric current of supporting insulator 6, I is to flow through leakage current of an arrester on-line computing model
The electric current of table 9.As seen from the figure, I=I1+ I2- I3 .When arrester exterior insulation dry tack free is clean, I2It is very small；When keeping away
When thunder device supporting insulator 6 insulate good, I3It is very small；At this moment I is substantially equal to I1, it is believed that flow through arrester leakage electricity
The electric current of on-line monitoring instrument 9 is flowed, as flows through the electric current of arrester spool 4.But there are more serious when arrester exterior insulation
Filth, or even during superposition sleety weather, filthy electric current I2Numerical value can become very big, and it is online that this electric current flows through leakage current of an arrester
Measuring instrument 9, causes the electric current that leakage current of an arrester on-line monitoring instrument 9 detects to be more than the electricity for flowing through arrester spool 4
Stream.When arrester supporting insulator 6 insulate bad, R3Diminish, I3Become larger, leakage current of an arrester on-line computing model can be caused
The electric current that table 9 detects is less than the electric current for flowing through arrester spool 4.Above-mentioned two situations often occur in real work, give
Accurate judgement arrester health status brings puzzlement, and the bottle that various arresters on-line monitoring function correctly plays a role
Neck.Coordinate to find out its cause, this is arrester structure with corresponding arrester on-line monitoring equipment, it is intrinsic the defects of.Because flow through
The electric current of metallic conductor 13 and the electric current for flowing through leakage current of an arrester on-line monitoring instrument 9 are same electric current all the time, therefore
The method for realizing leakage current of an arrester on-line monitoring using the electric current on current transformer measurement metallic conductor 13, there is also upper
State the defects of intrinsic.
Chinese utility model patent CN201310381377.1, be related to one kind can wireless monitor take shelter from the thunder.Its main contents
It is that one group of low-voltage zinc oxide valve block is inserted into the lower part of the original valve block of arrester spool, while in this group of low-voltage zinc oxide valve block
Upper and lower side sets copper electrode respectively, and installing is comprising taking electricity, electric power detection, radio-frequency receiving-transmitting, letter in arrester exterior insulation sheath
Number processing etc. function module loop circuit.Loop circuit input terminal is connected with two copper electrodes respectively, forms low-voltage zinc oxide
The shunt circuit of valve block and loop circuit, the shunt circuit form series loop with original arrester zinc oxide valve plate at the same time.
When the patent thinks normal operation, low-voltage zinc oxide valve block resistance value is far longer than the input impedance of loop circuit, therefore big portion absolutely
Divide electric current to flow through loop circuit, and think that this electric current is approximately equal to the leakage current of arrester under working voltage.Annular electro
Electric power detection module in road gathers this electric current, and the sampled value of electric power detection module is calculated in signal processing module
Current values, the corresponding information that calculates is sent to reception device by RF receiving and transmission module, so as to fulfill the on-line monitoring of arrester.
There are following Railway Project for the realization of this patent.First, it is inserted into one group of low pressure in original arrester zinc oxide valve plate lower part
Zinc oxide valve plate, and pass through the way of the copper sheet connection loop circuit at low-voltage zinc oxide valve block both ends, it is original its essence is utilizing
Zinc oxide valve plate and low-voltage zinc oxide valve block form series circuit and carry out partial pressure.Since zinc oxide valve plate is a kind of non-linear in itself
Element, while the resistance value of different zinc oxide valve plates and nonlinear characteristic are not fully identical, the number that this series connection partial pressure obtains
Value discreteness is very high, and the accuracy measured can not be guaranteed.Second, it is inserted into original arrester zinc oxide valve plate lower part
One group of low-voltage zinc oxide valve block, inevitably changes the running parameter and characteristic of original arrester.3rd, loop circuit master
To be made of electronic component, it is contemplated that the factor of running environment, the service life of loop circuit are far smaller than lightning arrester body
Service life.Loop circuit is placed in the way inside lightning arrester insulation oversheath, the life of arrester normal operation will necessarily be faced
Order in the cycle, the problem of loop circuit premature failure, do not simply fail to ensure the normal realization of on-line monitoring, and ring can not be repaired
Failure in shape circuit, or even influence the normal operation of lightning arrester body.Therefore this patent can not solve above-mentioned keep away
Intrinsic problem existing for leakage current of an arrester on-line monitoring method under thunder device structure and corresponding working voltage.It is Chinese practical new
Type patent No. CN201410534755.X, is related to arrester live monitoring technical field, and in particular to there is one kind leakage current to survey
Measure the arrester of function.It is to the effect that a kind of to have the function of the arrester of leakage current measurement, including the umbrella cover of exterior sealing,
The core group being made of at least one metal oxide valve block being arranged inside the umbrella cover, the is equipped with the top of the core group
One aluminium electrode, lower part are equipped with leakage current measurement sensor.Leakage current measurement sensor described in the patent includes the second aluminium electrode, the
Three aluminium electrodes and the resistor disc being arranged between second aluminium electrode and the 3rd aluminium electrode.Its described second aluminium electrode is set
The lower part of core group is placed in, the detection cathode being drawn out to outside the umbrella cover is equipped with the second aluminium electrode, in the 3rd aluminium electricity
Pole leads to detection anode；In the art solutions, lightning arrester leakance is transformed to voltage signal using resistance, is utilized
Voltage signal is drawn out to outside lightning arrester sheath by the detection cathode and detection anode at resistance both ends, is worth to and kept away according to the voltage
The situation of change of thunder device leakage current, realizes the live detection of lightning arrester leakance.The technical solution of the patent is still utilization
The original spool of arrester forms bleeder circuit of connecting with the resistance newly added, by measuring the voltage at resistance both ends, and according to new
The computing the resistor value for adding resistance obtains leakage current.It is that instead of Chinese utility model patent with the resistance of a fixed resistance value nothing but
Low-voltage zinc oxide valve block in number CN201310381377.1 schemes.Following problem is still remained in this patent formula.First,
Since zinc oxide valve plate is a kind of non-linear element in itself, while the resistance value of different zinc oxide valve plates and nonlinear characteristic are not
Identical, the numerical discretization that this series connection partial pressure obtains is very high, and the accuracy measured can not be guaranteed.Second,
Resistance is inserted into original arrester zinc oxide valve plate lower part, inevitably changes running parameter and the spy of original arrester
Property.It particularly refer to draw on exterior Umbrella not dipping water while closing set in Chinese utility model patent CN201410534755.X schemes
Two electrodes, for the very high arrester of sealing requirements, there are larger hidden danger.Therefore this patent can not also solve
Inherently asked existing for leakage current of an arrester on-line monitoring method under above-mentioned arrester structure and corresponding working voltage
Topic.At present, prior art does not have the above problem effective solution.
Utility model content
The purpose of this utility model is to provide a kind of arrester of built-in current mutual inductor, is directly surveyed by current transformer
Amount flows through the leakage current of arrester spool, so as to exclude the influence of other factors, improves the accuracy of measurement result and reliable
Property, while the accuracy and reliability of arrester on-line monitoring system is improved, solve the above problem present in background technology.
The utility model aim is realized by following technical solution：
A kind of arrester of built-in current mutual inductor, comprising upper flange, exterior insulation, insulating cylinder or insulation plastic structure, keeps away
Thunder device spool, lower flange, electrode, current transformer, current transformer output line and current transformer output signaling interface；Upper method
Arrester spool is equipped between blue and lower flange, electrode is arranged below in arrester spool, and electrode is arranged on above lower flange, takes shelter from the thunder
Insulating cylinder or insulation plastic structure are equipped with outside device spool, current transformer is cased with outside insulating cylinder or insulation plastic structure；Electric current
The outside of mutual inductor is equipped with exterior insulation；The current transformer output line of current transformer, with the current transformer on lower flange
Export signaling interface connection.
Upper flange, metal material are conductive；Exterior insulation, generally porcelain or silicon rubber；Insulating cylinder or insulation plastic structure,
While strengthening insulating, increase structural strength；Zinc oxide valve plate is superimposed the arrester spool to be formed；Electrode, metal material, even
Arrester spool and lower flange are connect, it is conductive；Lower flange, metal material are conductive；Current transformer and current transformer output line,
Current transformer output signaling interface is known frame mode.
The utility model adds current transformer, Current Mutual Inductance on the architecture basics of original Zinc-Oxide Arrester
Device output line and current transformer output signaling interface three parts.The current transformer, using core through type current transformer.
Current transformer is arranged in the outside of insulating cylinder or the plastic structure that insulate, the inside of exterior insulation.Insulating cylinder or insulation system punching
Pass through current transformer.This construction and arrangement mode, it is ensured that do not change the structural strength and operating parameter of arrester, electric current
There are enough dielectric strengths between mutual inductor and arrester spool and electrode, while exterior insulation can also be carried to current transformer
For exterior insulation protection and mechanical strength protection.
The current transformer, due to the leakage current numerical value very little under arrester working voltage, be mostly microampere order and
Milliampere level, therefore current transformer must possess the ability of accurate measurement Weak current, can use zero-flux current transformer or
Other current transformers for possessing measurement Weak current ability.
The current transformer, has no-load voltage ratio K.No-load voltage ratio K can be according to the different numerical value of the different parameter setting of arrester.
The current transformer, should be arranged in arrester bottom, be supported by lower flange, and horizontal level is concordant with electrode,
Along the bottom for being no more than arrester valve piece on mutual inductor.Ensure that current transformer is in ground potential region, improve current transformer
With arrester reliability of operation.
The current transformer, outside should have metallic shielding structure, and metallic shielding structure does not produce shadow to current measurement
Ring, metallic shield is connected with arrester lower flange metal part, there are enough dielectric strengths between metallic shield and electrode.
The current transformer is made of iron core, winding and metallic shielding structure, it is believed that current transformer is with keeping away
Thunder device body has identical operation life cycle.
The current transformer output line, connects secondary winding in current transformer and current transformer output signal connects
Mouthful, effect is that current transformer output signal is transmitted to current transformer output signaling interface.Current transformer output line should
There are enough insulation measures and dielectric strength, line footpath should meet the requirement of mechanical strength and loss of signal, and outside is arranged using shielding
Apply.
The current transformer output signaling interface, is arranged on the lower flange on the outside of exterior insulation, terminals are with
There are enough dielectric strengths between flange.
During normal operation, a kind of arrester of built-in current mutual inductor accesses electric system by upper flange, passes through laxative remedy
Orchid access grounded screen；Under the action of working voltage, leakage current of an arrester flows through arrester spool, electrode, and passes through laxative remedy
Orchid flows into the earth；Since current transformer is sleeved on the outside of insulating cylinder or the plastic structure that insulate, that is, arrester spool has been sleeved on it
With the outside of electrode；Leakage current punching flows through the primary side of current transformer, will induce electric current in secondary side；This electric current
Current transformer output interface is transferred to by current transformer output line；Externally measured meter or arrester on-line monitoring dress
The reception Current Transformer Secondary electric current at current transformer output interface is put, and according to current transformer ratio K, calculates electricity
Current transformer primary current value；The current transformer primary current value being calculated is the leakage electricity under arrester working voltage
Flow valuve.
When the utility model accesses electric system, leakage current of an arrester on-line monitoring instrument or arrester on-line monitoring dress
Putting acquisition leakage current numerical value can directly obtain at current transformer output interface, it is no longer necessary to supporting insulator and metal
Conductor.Arrester installation form is simplified, reduces installing component, improves arrester reliability of operation.
The good effect of the utility model is：Do not change the performance parameters of arrester, do not change the main body knot of arrester
On the premise of structure, exclude to influence the factor of leakage current of an arrester measurement accuracy and reliability under working voltage, realize to fortune
The accurate measurement of leakage current of an arrester under row voltage, the reliability and accuracy of lifting arrester on-line monitoring.Simplify and keep away
Thunder device installation form, reduces installing component, improves arrester reliability of operation.
Brief description of the drawings
Fig. 1 is the structure diagram of prior art Zinc-Oxide Arrester；
Fig. 2 coordinates On-line Monitoring of Leakage Current instrument scheme of installation for prior art Zinc-Oxide Arrester；
Fig. 3 is equivalent circuit diagram；
Fig. 4 is the structure diagram of the utility model embodiment；
Fig. 5 is the utility model scheme of installation；
In figure：Upper flange 1, exterior insulation 2, insulating cylinder or insulation plastic structure 3, arrester spool 4, lower flange 5, arrester
Framework 7, down conductor 8, leakage current of an arrester on-line monitoring instrument 9, current transformer 10, current transformer output line
11st, current transformer output signaling interface 12, metallic conductor 13, amplification control circuit 14, electrode 15.
Embodiment
Below in conjunction with attached drawing, by embodiment, the utility model is described in further detail.
A kind of arrester of built-in current mutual inductor, comprising upper flange 1, exterior insulation 2, insulating cylinder or insulation plastic structure 3,
Arrester spool 4, lower flange 5, electrode 15, current transformer 10, current transformer output line 11 and current transformer output letter
Number interface 12；Arrester spool 4 is equipped between upper flange 1 and lower flange 5, electrode 15, electrode 15 is arranged below in arrester spool 4
It is arranged on above lower flange 5, arrester spool 4 and the outside of electrode 15 are equipped with insulating cylinder or insulation plastic structure 3, insulating cylinder or insulation
The outside of plastic structure 3 is cased with current transformer 10；The outside of current transformer 10 is equipped with exterior insulation 2；Current transformer 10
Current transformer output line 11, is connected with the current transformer output signaling interface 12 on lower flange 5.
Upper flange, metal material are conductive；Exterior insulation, generally porcelain or silicon rubber；Insulating cylinder or insulation plastic structure,
While strengthening insulating, increase structural strength；Zinc oxide valve plate is superimposed the arrester spool to be formed；Electrode, metal material, even
Arrester spool and lower flange are connect, it is conductive；Lower flange, metal material are conductive；Current transformer and current transformer output line,
Current transformer output signaling interface is known frame mode.
The utility model adds current transformer, Current Mutual Inductance on the architecture basics of original Zinc-Oxide Arrester
Device output line and current transformer output signaling interface three parts.The current transformer, using core through type current transformer.
Current transformer is arranged in the outside of insulating cylinder or the plastic structure that insulate, the inside of exterior insulation.Insulating cylinder or insulation system punching
Pass through current transformer.This construction and arrangement mode, it is ensured that do not change the structural strength and operating parameter of arrester, electric current
There are enough dielectric strengths between mutual inductor and arrester spool and electrode, while exterior insulation can also be carried to current transformer
For exterior insulation protection and mechanical strength protection.
The current transformer, due to the leakage current numerical value very little under arrester working voltage, be mostly microampere order and
Milliampere level, therefore current transformer must possess the ability of accurate measurement Weak current, can use zero-flux current transformer or
Other current transformers for possessing measurement Weak current ability.
The current transformer, has no-load voltage ratio K.No-load voltage ratio K can be according to the different numerical value of the different parameter setting of arrester.
The current transformer, should be arranged in arrester bottom, be supported by lower flange, and horizontal level is concordant with electrode,
Along the bottom for being no more than arrester valve piece on mutual inductor.Ensure that current transformer is in ground potential region, improve current transformer
With arrester reliability of operation.
The current transformer, outside should have metallic shielding structure, and metallic shielding structure does not produce shadow to current measurement
Ring, metallic shield is connected with arrester lower flange metal part, there are enough dielectric strengths between metallic shield and electrode.
The current transformer is made of iron core, winding and metallic shielding structure, it is believed that current transformer is with keeping away
Thunder device body has identical operation life cycle.
The current transformer output line, connects secondary winding in current transformer and current transformer output signal connects
Mouthful, effect is that current transformer output signal is transmitted to current transformer output signaling interface.Current transformer output line should
There are enough insulation measures and dielectric strength, line footpath should meet the requirement of mechanical strength and loss of signal, and outside is arranged using shielding
Apply.
The current transformer output signaling interface, is arranged on the lower flange on the outside of exterior insulation, terminals are with
There are enough dielectric strengths between flange.
During normal operation, a kind of arrester of built-in current mutual inductor accesses electric system by upper flange 1, passes through laxative remedy
Orchid 5 accesses grounded screen；Under the action of working voltage, leakage current of an arrester flows through arrester spool 4, electrode 15, and passes through
Laxative remedy 5 flows into the earth；Since current transformer is sleeved on the outside of insulating cylinder or the plastic structure 3 that insulate, that is, arrester has been sleeved on it
The outside of spool 4 and electrode 15；Leakage current punching flows through the primary side of current transformer 10, will induce electricity in secondary side
Stream；This electric current is transferred to current transformer output interface 12 by current transformer output line 11；Externally measured meter or
Arrester on-Line Monitor Device receives Current Transformer Secondary electric current at current transformer output interface 12, and mutual according to electric current
Sensor no-load voltage ratio K, calculates current transformer primary current value；The current transformer primary current value being calculated is arrester
Leakage current values under working voltage.
Referring to the drawings 4.Upper flange 1 is metal material in the utility model, conductive, and effect is connection electric system.It is lightning-arrest
Device spool 4 is made of zinc oxide valve plate superposition, is the major part of arrester.Insulating cylinder or insulation plastic structure 3, are sleeved on arrester
The outside of spool 4 and electrode 15, mainly plays the role of strengthening insulation and strengthens mechanical strength.Exterior insulation 2, can be porcelain
Material can also be silastic material, be mainly to provide exterior insulation and provide necessary mechanical strength.Electrode 15, metal material
Matter, it is conductive, arrester spool and lower flange are connected, forms galvanic circle.Lower flange 5 is metal material, and conductive, effect is with keeping away
Thunder device framework 7, arrester ground downlead 8 connect and leakage current is provided and lightning current circulation passage.Current transformer 10,
For core through type current transformer, the outside of insulating cylinder or the plastic structure 3 that insulate is sleeved on.This arrangement is equivalent to arrester spool
4 and 15 punching of electrode by current transformer 10, flowing through the leakage current of arrester spool 4 becomes current transformer 10 once
Electric current.Current transformer output line 11, both ends connect the secondary winding output terminal and current transformer of current transformer 10 respectively
Signaling interface 12 is exported, main function is that the secondary winding electric current that current transformer 10 exports is transferred to current transformer output
Signaling interface 12.Current transformer output interface 12 is arranged on arrester lower flange 5, its main function is to receive Current Mutual Inductance
The secondary winding electric current of device 10, and be connected with various external detection equipments, the secondary winding electric current of current transformer 10 is transmitted
To various external detection equipments.There are enough dielectric strengths between the terminals and lower flange 5 of current transformer output interface 12.
Referring to the drawings 5.The utility model accesses electric system by upper flange 1.Arrester is mounted directly by lower flange 5
Grounded screen is accessed on arrester framework 7, and by down conductor 8.Supporting insulator 6 and metallic conductor 13 in attached drawing 2
No longer install and use.The flow cycle of lightning current in normal operation when the leakage current and lightning surge of arrester is to keep away
Thunder device upper flange 1, arrester spool 4, electrode 15, arrester lower flange 5, down conductor 8.Arrester lets out in normal operation
Leakage current punching flows through current transformer 10, and secondary current is induced in the secondary winding of current transformer 10.Current transformer
10 secondary current is transferred to current transformer output interface 12 by current transformer output line 11.Amplification control circuit 14,
The secondary current of current transformer 10 is received, gathered from current transformer output interface 12 by conducting wire.Amplification control circuit 14
The secondary current of current transformer 10 can be calculated according to the no-load voltage ratio K of current transformer 10, current transformer is calculated
10 primary current.The primary current for the current transformer 10 being calculated just is up the leakage current of middle arrester.
Amplification control circuit 14 can be required according to concrete engineering, according to the current value of input, export corresponding current value or magnitude of voltage.
Leakage current of an arrester on-line monitoring instrument 9, obtains input signal from amplification control circuit 14 and completes to show.Amplification control electricity
Communication module can also be included in road 14, the leakage current of an arrester value being calculated is sent to host computer, be monitored and
Judge.
The main innovation point of the utility model is in core through type current transformer built in arrester.Current transformer, which is sleeved on, to be kept away
Thunder device insulating cylinder or insulating cement structural outer so that the leakage current of an arrester flowed through in arrester spool becomes current transformer
Primary current.The secondary current of current transformer is transferred to the interface section outside arrester, there is provided leaks electricity to arrester
Flow on-line monitoring instrument or other on-Line Monitor Devices.This method eliminates arrester exterior insulation surface filth electric current and keeps away
Influence of the thunder device supports insulative insulating sublayer situation to leakage current of an arrester measurement accuracy, is realized to arrester under working voltage
The accurate measurement of leakage current, improves the reliability and accuracy of arrester on-line monitoring.Arrester installation is simplified at the same time
Form, reduces installing component, improves arrester reliability of operation.
To verify the validity of this patent scheme, we devise following testing program.
1. choose the 35kV Zinc-Oxide Arresters one of traditional structure, model Y5W-51/334.Select and the conventional junction
The identical element of the 35kV Zinc-Oxide Arresters of structure, the 35kV of a built-in current mutual inductor is made according to the art of this patent scheme
Zinc-Oxide Arrester, current transformer ratio K are 1000:1.To the two progress routine test, test data see the table below.By testing
Data understand that the art of this patent scheme does not change the parameter characteristic of arrester.
2. according to the scheme shown in attached drawing 2, to the 35kV arrester simulation connections of traditional structure.According to shown in attached drawing 5
Scheme, to the 35kV Zinc-Oxide Arrester simulation connections of built-in current transformer, wherein amplifying circuit selection amplification factor is
1000 times of current amplification circuit, leakage current of an arrester on-line monitoring instrument select microampere meter.In two arrester external insulations
In the case of dried and clean, two arrester upper flanges are in parallel, down conductor is in parallel.Using pressure-resistant machine to two arresters
Apply working voltage at the same time, record the reading of leakage current of an arrester on-line monitoring instrument.Collect on power equipment external insulation
Filth, is dissolved in water and filthy aqueous solution is made.Filthy aqueous solution is uniformly sprayed on two arrester external insulations, simulates arrester
Moist filthy service condition.Two arrester upper flanges are in parallel, and down conductor is in parallel, lightning-arrest to two using pressure-resistant machine
Device applies working voltage at the same time, records the reading of leakage current of an arrester on-line monitoring instrument.Test data see the table below.By testing
Data understand that the filthy electric current of external insulation is to letting out using the arrester of built-in current mutual inductor made of the art of this patent scheme
The measurement of leakage current on-line monitoring instrument does not influence.
Claims (4)
- A kind of 1. arrester of built-in current mutual inductor, it is characterised in that：Include upper flange (1), exterior insulation (2), insulating cylinder Or insulation plastic structure (3), arrester spool (4), lower flange (5), electrode (15), current transformer (10), current transformer are defeated Outlet (11) and current transformer output signaling interface (12)；Arrester spool is equipped between upper flange (1) and lower flange (5) (4), electrode (15) is arranged below in arrester spool (4), and electrode (15) is arranged on lower flange (5) above, arrester spool (4) and Insulating cylinder or insulation plastic structure (3) are equipped with outside electrode (15), Current Mutual Inductance is cased with outside insulating cylinder or insulation plastic structure (3) Device (10)；The outside of current transformer (10) is equipped with exterior insulation (2)；The current transformer output line of current transformer (10) (11), it is connected with the current transformer output signaling interface (12) on lower flange (5).
- A kind of 2. arrester of built-in current mutual inductor according to claim 1, it is characterised in that：The Current Mutual Inductance Device, using core through type current transformer, current transformer has the ability of measurement Weak current；The current transformer output connects Mouthful, it is connected with externally measured meter or arrester on-Line Monitor Device.
- A kind of 3. arrester of built-in current mutual inductor according to claim 1 or 2, it is characterised in that：The electric current Mutual inductor, should be arranged in arrester bottom, be supported by lower flange, and horizontal level is concordant with electrode, and edge is no more than and keeps away on mutual inductor The bottom of thunder device valve block.
- A kind of 4. arrester of built-in current mutual inductor according to claim 1 or 2, it is characterised in that：The electric current There are metallic shielding structure in mutual inductor, outside, and metallic shield is connected with arrester lower flange.
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| CN201721505104.3U CN207319825U (en) | 2017-11-13 | 2017-11-13 | A kind of arrester of built-in current mutual inductor |
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| CN201721505104.3U CN207319825U (en) | 2017-11-13 | 2017-11-13 | A kind of arrester of built-in current mutual inductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107768056A (en) * | 2017-11-13 | 2018-03-06 | 甘书宇 | A kind of arrester and its application method of built-in current transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107768056A (en) * | 2017-11-13 | 2018-03-06 | 甘书宇 | A kind of arrester and its application method of built-in current transformer |
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