CN110391108A - A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance - Google Patents
A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance Download PDFInfo
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- CN110391108A CN110391108A CN201810357534.8A CN201810357534A CN110391108A CN 110391108 A CN110391108 A CN 110391108A CN 201810357534 A CN201810357534 A CN 201810357534A CN 110391108 A CN110391108 A CN 110391108A
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- disconnecting switch
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- 238000002955 isolation Methods 0.000 title claims abstract description 65
- 239000004020 conductor Substances 0.000 title claims abstract description 26
- 230000003068 static effect Effects 0.000 claims abstract description 53
- 238000012806 monitoring device Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 17
- 238000013501 data transformation Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 13
- 238000007689 inspection Methods 0.000 description 11
- 230000008901 benefit Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 206010037660 Pyrexia Diseases 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
Abstract
The present invention provides one kind can measure the Intelligent isolation switch of conductor connection point and switch contact contact impedance, it is characterised in that subsidiary loop in parallel on the main power circuit of disconnecting switch；The subsidiary loop includes simultaneously contact one, subsidiary loop static contact, subsidiary loop moving contact and contact two, subsidiary loop conducting wire, current transformer group one, measuring resistance；Current transformer group two is mounted on main power circuit；The secondary circuit of the current transformer group one and current transformer group two is electrically connected with monitoring device, measures subsidiary loop electric current I ' and main power circuit electric current I respectively；Monitoring device is according to subsidiary loop electric current I ' and measuring resistance resistance value R ', calculate subsidiary loop pressure drop △ U=I ' R ', due to parallel relationship, the pressure drop of subsidiary loop is the pressure drop △ U for being main power circuit, further calculates out the contact impedance R of main power circuit；The present invention is according to the variation tendency of electric current it can be concluded that the variation tendency of heating power caused by contact impedance.
Description
Technical field
It is specifically a kind of to measure conductor connection point and switch contact contact resistance the present invention relates to disconnecting switch field
Anti- Intelligent isolation switch.
Background technique
During being powered on, the contact impedance of conductor connection point and switch contact can gradually increase existing disconnecting switch
Greatly, contact impedance can generate heat after increasing, to waste electric energy, or even burn out disconnecting switch, cause to have a power failure.
In order to solve this problem, currently with thermal infrared imager, manually to the tie point of disconnecting switch and contact position
Temperature monitoring is carried out, then switchs whether region of interest generates heat according to measured temperature detection and isolation；This method can only measure certain
The temperature conditions at one time point, but electric current is variation in route, cannot judge the fever feelings of disconnecting switch after electric current increases
Condition.Therefore it can only increase the thermometric frequency.
For this reason, it may be necessary to a kind of disconnecting switch that may determine that conductor connection point and switch contact fever trend.
Summary of the invention
To solve the above-mentioned problems, one kind provided by the invention can measure conductor connection point and switch contact contact impedance
Intelligent isolation switch, it is characterized in that a subsidiary loop in parallel on the main power circuit of disconnecting switch；The subsidiary loop packet
Containing simultaneously contact one, subsidiary loop static contact, subsidiary loop moving contact and contact two, subsidiary loop conducting wire, current transformer group
One, measuring resistance；The main power circuit of disconnecting switch include disconnecting switch inlet wire conducting wire, disconnecting switch inlet wire tie point, every
From switch static contact, disconnecting switch moving contact, disconnecting switch swivel joint, disconnecting switch go out line connection point, disconnecting switch goes out
Line conducting wire；The current transformer group one is mounted on subsidiary loop；The current transformer group two is mounted on disconnecting switch master
On power circuit；The current transformer group one, current transformer group two secondary circuit be electrically connected with monitoring device.
Current transformer group one can be the current transformer of one or more different measurement ranges, current transformer group two
It is also possible to the current transformer of one or more different measurement ranges.
Measuring resistance in subsidiary loop can be the resistance an of fixed resistance value or the resistance string of multiple fixed resistance values, simultaneously
The combination of connection.
Subsidiary loop static contact and subsidiary loop when disconnecting switch becomes disjunction state from closed state, in subsidiary loop
The disjunction of moving contact elder generation, disjunction after the static contact isolation switch and disconnecting switch moving contact in the main power circuit of disconnecting switch；Isolation
When switch becomes closed state from disjunction state, the static contact isolation switch and disconnecting switch in the main power circuit of disconnecting switch are dynamic
Contact is first closed, and is closed after the subsidiary loop static contact and subsidiary loop moving contact in subsidiary loop.
It can be measured any in main power circuit by adjusting the position of in subsidiary loop and contact one and contact two
The contact impedance of one independent position or multiple part combinations.
Monitoring device can transmit data by wired or wireless mode.
When being powered on, monitoring device is measured assisted back respectively by current transformer group one and current transformer group two
The electric current I ' on the road and electric current I of main power circuit；Monitoring device according to the electric current I ' of subsidiary loop and the resistance value R ' of measuring resistance,
Subsidiary loop pressure drop △ U=I ' * R ' is calculated, due to parallel relationship, the pressure drop of subsidiary loop is the pressure drop △ for being main power circuit
The electric current of U, the main power circuit part in parallel with subsidiary loop are I-I ', further calculate out the contact impedance of main power circuit
R=△ U/ (I-I ') and heating power P=(I-I ')2R。
One kind disclosed in this invention can measure the Intelligent isolation switch of conductor connection point and switch contact contact impedance
Principle can be adapted for the AC and DC disconnecting switch of free voltage grade and any structure type.
Ingenious place of the invention is: under normal circumstances, disconnecting switch conductor connection point and switch contact contact impedance
Generally in tens micro-ohms between several hundred micro-ohms, the resistance value of the measuring resistance in subsidiary loop is according to the electric current model of main power circuit
It encloses and the normal contact impedance of main power circuit conductor connection point and switch contact is selected, generally in several Europe of zero point to several Europe
Between.Therefore the electric current generated in subsidiary loop only has several one thousandths in the main power circuit of disconnecting switch, thus significantly
The electric current of subsidiary loop is reduced, and then the technical requirements of device substantially reduce in subsidiary loop, range of choice is more extensive；Together
When, it, will not be to main power circuit just even if subsidiary loop disconnects since subsidiary loop is connected in parallel on main power circuit
Often operation impacts.
Advantages of the present invention:, can be according to the variation of electric current by measurement conductor connection point and switch contact contact impedance
Trend obtains the variation tendency of the heating power due to caused by contact impedance, and fortune inspection personnel can decide whether to need to tie up in advance
Shield, the defect of fever trend cannot accurately be prejudged by solving common temp measuring method, so that the work of fortune inspection personnel has more and is directed to
Property, working efficiency is improved, to save artificial.
Detailed description of the invention
Fig. 1: Intelligent isolation switch schematic diagram；
Fig. 2: the Intelligent isolation switch schematic diagram of embodiment 1；
Fig. 3: subsidiary loop static contact, the subsidiary loop moving contact schematic diagram of embodiment 1；
Fig. 4: the Intelligent isolation switch gate-dividing state schematic diagram of embodiment 1；
Fig. 5: subsidiary loop contact gate-dividing state, the isolation switch contact "on" position schematic diagram of embodiment 1；
Fig. 6: the Intelligent isolation switch schematic diagram of embodiment 2；
Fig. 7: subsidiary loop static contact, the subsidiary loop moving contact schematic diagram of embodiment 2；
Fig. 8: the Intelligent isolation switch gate-dividing state schematic diagram of embodiment 2；
Fig. 9: subsidiary loop contact gate-dividing state, the isolation switch contact "on" position schematic diagram of embodiment 2；
Figure 10: the Intelligent isolation switch schematic diagram of embodiment 3；
Figure 11: subsidiary loop contact one, two schematic diagram of subsidiary loop contact of embodiment 3；
Figure 12: the Intelligent isolation switch gate-dividing state schematic diagram of embodiment 3；
Figure 13: subsidiary loop contact gate-dividing state, the isolation switch contact "on" position schematic diagram of embodiment 3.
Attached drawing 2 to Fig. 5 mark list:
1. disconnecting switch inlet wire conducting wire, 2. disconnecting switch inlet wire tie points, 3. static contact isolation switches, the dynamic touching of 4. disconnecting switch
Head, 5. disconnecting switch swivel joints, 6. disconnecting switch go out line connection point, 7. disconnecting switch outgoing conductors, and 8. and contact one, 9.
Subsidiary loop static contact, 10. subsidiary loop moving contacts, 11. current transformer groups one, 12. subsidiary loop conducting wires, 13. standard electrics
Resistance, 14. and contact two, 15. current transformer groups two, 16. monitoring devices.
Attached drawing 6 to Fig. 9 mark list:
1. disconnecting switch inlet wire conducting wire, 2. disconnecting switch inlet wire tie points, 3. static contact isolation switches one, the dynamic touching of 4. disconnecting switch
First, 6. disconnecting switch go out line connection point, 7. disconnecting switch outgoing conductors, and 8. and contact one, 9. subsidiary loop static contacts one,
10. subsidiary loop moving contact two, 11. current transformer groups one, 12. subsidiary loop conducting wires, 13. measuring resistances, 14. and contact
Two, 15. current transformer groups two, 16. monitoring devices, 31. static contact isolation switches two, 41. disconnecting switch moving contacts two, 91.
Subsidiary loop static contact one, 101. subsidiary loop moving contacts two.
Attached drawing 10 to Figure 13 mark list:
1. disconnecting switch inlet wire conducting wire, 2. disconnecting switch inlet wire tie points, 3. switch touchings are first, 4. isolation switch contacts
Two, 5. disconnecting switch swivel joints one, 6. disconnecting switch go out line connection point, 7. disconnecting switch outgoing conductors, and 8. and contact one,
9. subsidiary loop contact one, 10. subsidiary loop contacts two, 11. current transformer groups one, 12. subsidiary loop conducting wires, 13. standards
Resistance, 14. and contact two, 15. current transformer groups two, 16. monitoring devices, 51. disconnecting switch swivel joints two.
Specific embodiment
Embodiments of the present invention are illustrated with reference to the accompanying drawing.
Embodiment 1:
A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance, referring to Fig.1, Fig. 2, Fig. 3, figure
4 and Fig. 5, structure pass through subsidiary loop conducting wire comprising measuring resistance 13, subsidiary loop static contact 9, subsidiary loop moving contact 10
12 are serially connected on subsidiary loop；Current transformer group 1 is mounted on subsidiary loop；Current transformer group 2 15 be mounted on every
It leaves and closes on main power circuit；16 electricity of current transformer group 1, the secondary circuit of current transformer group 2 15 and monitoring device
Connection；The main power circuit of disconnecting switch includes disconnecting switch inlet wire conducting wire 1, disconnecting switch inlet wire tie point 2, disconnecting switch
Static contact 3, disconnecting switch moving contact 4, disconnecting switch swivel joint 5, disconnecting switch go out line connection point 6 and disconnecting switch outlet
Conducting wire 7.
Preferably: referring to Fig. 2, will simultaneously contact 1 be connected with disconnecting switch inlet wire tie point 2, and 2 14 He of contact
Disconnecting switch goes out line connection point 6 and is connected, so that subsidiary loop is connected in parallel on the main power circuit of disconnecting switch, what is measured at this time is
Static contact isolation switch 3 and the contact position of disconnecting switch moving contact 4, disconnecting switch swivel joint 5 this contact resistance at two
It is anti-.
Further, referring to Fig. 4 and Fig. 5, when disconnecting switch becomes disjunction state from closed state, the dynamic touching of subsidiary loop
First 10 follow disconnecting switch moving contact 4, open up together, as long as disconnecting switch moving contact 4 moves up seldom distance, one
As 3-5mm, subsidiary loop moving contact 10 can with 9 disjunction of subsidiary loop static contact, at this time static contact isolation switch 3 and isolation
Switch movable contact 4 just just starts to carry out disjunction, and the complete disjunction of disconnecting switch could be made by continuing up opening；It is opposite, when every
When leaving pass becomes closed state from disjunction state, subsidiary loop moving contact 10 follows disconnecting switch moving contact 4, closes downwardly together
It closes, static contact isolation switch 3 and disconnecting switch moving contact 4 approach when being closed completely with position, subsidiary loop static contact 9 and auxiliary
Circuit moving contact 10 just starts to be closed.
The benefit of such setting is to avoid the electric current of the main power circuit in disconnecting switch switching on and off from being applied to assist back
On the road.
Embodiments of the present invention can also be changed as follows:
Specifically, main is powered back can be measured by adjusting simultaneously contact 1 and the simultaneously link position of contact 2 14 in subsidiary loop
The contact impedance and heating power size of road any position.
Can also be by the quantity of increase subsidiary loop, the contact impedance to swivel joint and switch contact and the function that generates heat
Rate size measures respectively.
Disjunction can also be carried out to subsidiary loop static contact 9 and subsidiary loop moving contact 10 with individual control equipment, closed
The control of conjunction first divides the sequence closed afterwards to reach subsidiary loop relative to main power circuit.
When being powered on, electric current passes through the contact position of static contact isolation switch 3 and disconnecting switch moving contact 4, isolation
Switch rotary tie point 5 this at two when position, due to the presence of contact impedance R, pressure drop △ U will certainly be generated.
Further, the principle equal using parallel circuit voltage reads current transformer group 1 by monitoring device
Secondary current, calculate subsidiary loop actual current I ', can calculate and contact 1 to and contact 2 14 between pressure
Drop, this pressure drop are equal to the pressure drop of main power circuit, i.e. △ U=I ' * R '.
Further, the secondary current value of the current transformer group two on main power circuit is read by monitoring device, is counted
Current value I in main power circuit is calculated, static contact isolation switch 3 and disconnecting switch moving contact in main power circuit can be calculated
The contact impedance of this position at two of 4 contact position, disconnecting switch swivel joint 5, i.e. R=△ U/ (I-I ').
Further, connecing for static contact isolation switch 3 and disconnecting switch moving contact 4 in main power circuit can also be calculated
Touch the heating power of this position at two of position and disconnecting switch swivel joint 5, i.e. P=(I-I ') 2R.
Further, the electric current in main power circuit changes with the variation of load, can reach when electric current is big
Several hundred or even several kiloamperes may only have tens amperes even several amperes when small；Likewise, the electric current in subsidiary loop
Change with curent change in main power circuit, also increases because the contact resistance of main power circuit increases, in order to enable electric
The measurement of stream is more accurate, and current transformer group 1 can be the current transformer of one or more different measurement ranges, electricity
Current transformer group 2 15 is also possible to the current transformer of one or more different measurement ranges；To guarantee more accurately to calculate
Contact impedance and heating power.
It further,, can be with when single resistance and power can not meet real requirement in order to meet measurement demand
By being realized with multiple resistance strings, parallel combination.
Further, disconnecting switch contact impedance and heating power that monitoring device 16 will be calculated, by wired or
Fortune inspection personnel are wirelessly timely transmitted to, fortune inspection personnel can decide whether to need to safeguard in advance, so that fortune inspection personnel
It works more targeted, improves working efficiency, to save artificial.
Embodiment 2:
A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance, referring to Fig.1, Fig. 6, Fig. 7, figure
8 and Fig. 9, structure include measuring resistance 13, subsidiary loop static contact 1, subsidiary loop static contact 2 91, the dynamic touching of subsidiary loop
First 10, subsidiary loop moving contact 2 101 is serially connected on subsidiary loop by subsidiary loop conducting wire 12；Current transformer group 1
It is mounted on subsidiary loop；Current transformer group 2 15 is mounted on the main power circuit of disconnecting switch；Current transformer group 1,
The secondary circuit of current transformer group 2 15 is electrically connected with monitoring device 16；The main power circuit of disconnecting switch includes to keep apart
Put line conducting wire 1, disconnecting switch inlet wire tie point 2, static contact isolation switch 1, static contact isolation switch 2 31, disconnecting switch into
Moving contact 1, disconnecting switch moving contact 2 41, disconnecting switch go out line connection point 6 and disconnecting switch outgoing conductor 7.
Preferably: referring to Fig. 6, will simultaneously contact 1 be connected with disconnecting switch inlet wire tie point 2, and 2 14 He of contact
Disconnecting switch goes out line connection point 6 and is connected, so that subsidiary loop is connected in parallel on the main power circuit of disconnecting switch, what is measured at this time is
Static contact isolation switch 1 and disconnecting switch moving contact 1, static contact isolation switch 2 31 and disconnecting switch moving contact 2 41 this
The contact impedance of contact position at two.
Further, referring to Fig. 8 and Fig. 9, when disconnecting switch becomes disjunction state from closed state, the dynamic touching of subsidiary loop
First 10 follow disconnecting switch moving contact 1, subsidiary loop moving contact 2 101 to follow disconnecting switch moving contact 2 41 horizontal together
Unscrew, as long as disconnecting switch moving contact 1 and disconnecting switch moving contact 2 41 move horizontally seldom distance, general 3-
5mm, subsidiary loop moving contact 1, subsidiary loop moving contact 2 101 can respectively with subsidiary loop static contact 1, auxiliary
Circuit moving contact 2 91 separates, at this time static contact isolation switch 1 and disconnecting switch moving contact 1, static contact isolation switch two
31 and disconnecting switch moving contact 2 41 just just start to be separated, be fully able to bear the electric current in power circuit, continue horizontal
Direction, which is opened, could make the complete disjunction of disconnecting switch；Opposite, it is auxiliary when disconnecting switch becomes closed state from disjunction state
Help circuit moving contact 1 that disconnecting switch moving contact 1, subsidiary loop moving contact 2 101 is followed to follow disconnecting switch moving contact two
41 together rotate horizontally closure, static contact isolation switch 1, static contact isolation switch 2 31 respectively with disconnecting switch moving contact one
4, disconnecting switch moving contact 2 41 close to be closed completely with position when, subsidiary loop static contact 1, subsidiary loop static contact 2 91
Just start to be closed with subsidiary loop moving contact 1, subsidiary loop moving contact 2 101 respectively.
The benefit of such setting is to avoid in disconnecting switch switching on and off, and the electric current of main power circuit, which is applied to, to be assisted back
On the road.
Embodiments of the present invention can also be changed as follows:
Specifically, main is powered back can be measured by adjusting simultaneously contact 1 and the simultaneously link position of contact 2 14 in subsidiary loop
The contact impedance of any position and heating power size in road.
It can also be by the quantity of increase subsidiary loop, to the contact impedance and heating power size point of two groups of switch contacts
It does not measure.
It to subsidiary loop static contact 1, subsidiary loop static contact 2 91 and can also be assisted back with individually control equipment
Road moving contact 1, subsidiary loop moving contact 2 101 carry out disjunction, the control of closure respectively, with reach subsidiary loop relative to
Main power circuit first divides the sequence closed afterwards.
When being powered on, need to apply one accordingly in the position of disconnecting switch inlet wire tie point 2 in main power circuit
Voltage and current, Cai Nengshi winner power circuit can normally work, when electric current by static contact isolation switch 1 and every
From switch movable contact 1, static contact isolation switch 2 31 and disconnecting switch moving contact 2 41 this at two when contact position, by
In the presence of contact impedance R, pressure drop △ U will certainly be generated.
Further, the principle equal using parallel circuit voltage reads circuit current mutual inductor group by monitoring device
One 11 secondary current calculates subsidiary loop actual current I ', using voltage computing formula, can calculate simultaneously contact 1
Voltage between simultaneously contact 2 14, this voltage is exactly the voltage drop value of main power circuit, i.e. △ U=I ' * R '.
Further, the secondary current value of the current transformer group two on main power circuit is read by monitoring device, is counted
Current value I in main power circuit is calculated, using resistance calculations formula, isolating switch static contact in main power circuit can be calculated
First 3 and disconnecting switch moving contact 1, static contact isolation switch 2 31 and disconnecting switch moving contact 2 41 this contact position at two
Contact impedance, i.e. R=△ U/(I-I ').
Further, static contact isolation switch 1 and disconnecting switch moving contact one in main power circuit can also be calculated
4, the heating power of this contact position at two of static contact isolation switch 2 31 and disconnecting switch moving contact 2 41, i.e. P=(I-I ') 2
R。
Further, the electric current in main power circuit changes with the variation of load, can reach when electric current is big
Several hundred or even several kiloamperes may only have tens amperes even several amperes when small；Likewise, the electric current in subsidiary loop
Change with curent change in main power circuit, also increases because the contact resistance of main power circuit increases, in order to enable electric
The measurement of stream is more accurate, and current transformer group 1 can be the current transformer of one or more different measurement ranges, electricity
Current transformer group 2 15 is also possible to the current transformer of one or more different measurement ranges；To guarantee more accurately to calculate
Contact impedance and heating power.
It further,, can be with when single resistance and power can not meet real requirement in order to meet measurement demand
By being realized with multiple resistance strings, parallel combination.
Further, disconnecting switch contact impedance and heating power that monitoring device 16 will be calculated, by wired or
Fortune inspection personnel are wirelessly timely transmitted to, fortune inspection personnel can decide whether to need to safeguard in advance, so that fortune inspection personnel
It works more targeted, improves working efficiency, to save artificial.
Embodiment 3:
A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance, referring to Fig.1, Figure 10, Figure 11,
Figure 12 and Figure 13, structure pass through subsidiary loop comprising measuring resistance 13, subsidiary loop contact 1, subsidiary loop contact 2 10
Conducting wire 12 is serially connected on subsidiary loop；Current transformer group 1 is mounted on subsidiary loop；Current transformer group 2 15 is installed
On the main power circuit of disconnecting switch；Current transformer group 1, the secondary circuit of current transformer group 2 15 and monitoring device
16 electrical connections；The main power circuit of disconnecting switch includes disconnecting switch inlet wire conducting wire 1, disconnecting switch inlet wire tie point 2, isolation
Switch contact 1, isolation switch contact 24, disconnecting switch swivel joint 1, disconnecting switch swivel joint 2 51, isolation
Switch out line connection point 6 and disconnecting switch outgoing conductor 7.
Preferably: referring to Fig.1 0, will and contact 1 be connected with disconnecting switch inlet wire tie point 2, and 2 14 He of contact
Disconnecting switch goes out line connection point 6 and is connected, so that subsidiary loop is connected in parallel on the main power circuit of disconnecting switch, what is measured at this time is
The contact position of switch touching first 3 and isolation switch contact 24, disconnecting switch swivel joint 1, disconnecting switch rotation
The contact impedance of this position at three of tie point 2 51.
Further, with reference to Figure 12 and Figure 13, when disconnecting switch becomes disjunction state from closed state, subsidiary loop touching
First 2 10 follow isolation switch contact 24, rotate horizontally open together, as long as isolation switch contact 24 rotates horizontally movement very
Few distance, general 3-5mm, subsidiary loop contact 2 10 can be with one 9 disjunction of subsidiary loop contact, at this time switch touchings
First 3 and isolation switch contact 24 just just start carry out disjunction, continue rotate horizontally open could disconnecting switch be divided completely
It is disconnected；Opposite, when disconnecting switch becomes closed state from disjunction state, subsidiary loop contact 2 10 follows isolation switch contact
24, it rotates horizontally be closed together, switch touching first 3 and isolation switch contact 24 approach when being closed completely with position, auxiliary
Circuit contact 1 and subsidiary loop contact 2 10 is helped just to start to be closed.
The benefit of such setting is to avoid the electric current of the main power circuit in disconnecting switch switching on and off from being applied to assist back
On the road.
Embodiments of the present invention can also be changed as follows:
Specifically, main is powered back can be measured by adjusting simultaneously contact 1 and the simultaneously link position of contact 2 14 in subsidiary loop
The contact impedance and heating power size of road any position.
Can also be by the quantity of increase subsidiary loop, the contact impedance to swivel joint and switch contact and the function that generates heat
Rate size measures respectively.
Disjunction can also be carried out to subsidiary loop contact 1 and subsidiary loop contact 2 10 with individual control equipment, closed
The control of conjunction first divides the sequence closed afterwards to reach subsidiary loop relative to main power circuit.
When being powered on, electric current passes through the contact position of switch touching first 3 and isolation switch contact 24, isolation
Switch rotary tie point 1, disconnecting switch swivel joint 2 51 this at three when position, due to the presence of contact impedance R,
Pressure drop △ U will certainly be generated.
Further, the principle equal using parallel circuit voltage reads current transformer group 1 by monitoring device
Secondary current, calculate subsidiary loop actual current I ', can calculate and contact 1 to and contact 2 14 between pressure
Drop, this pressure drop are equal to the pressure drop of main power circuit, i.e. △ U=I ' * R '.
Further, the secondary current value of the current transformer group two on main power circuit is read by monitoring device, is counted
Current value I in main power circuit is calculated, switch touching first 3 and isolation switch contact two in main power circuit can be calculated
The contact impedance of this position at three of 4 contact position, disconnecting switch swivel joint 1, disconnecting switch swivel joint 2 51,
That is R=△ U/ (I-I ').
Further, contact position, the isolation of switch touching first 3 and isolation switch contact 24 can also be calculated
The heating power of this position at three of switch rotary tie point 1, disconnecting switch swivel joint 2 51, i.e. P=(I-I ') 2R.
Further, the electric current in main power circuit changes with the variation of load, can reach when electric current is big
Several hundred or even several kiloamperes may only have tens amperes even several amperes when small；Likewise, the electric current in subsidiary loop
Change with curent change in main power circuit, also increases because the contact resistance of main power circuit increases, in order to enable electric
The measurement of stream is more accurate, and current transformer group 1 can be the current transformer of one or more different measurement ranges, electricity
Current transformer group 2 15 is also possible to the current transformer of one or more different measurement ranges；To guarantee more accurately to calculate
Contact impedance and heating power.
It further,, can be with when single resistance and power can not meet real requirement in order to meet measurement demand
By being realized with multiple resistance strings, parallel combination.
Further, disconnecting switch contact impedance and heating power that monitoring device 16 will be calculated, by wired or
Fortune inspection personnel are wirelessly timely transmitted to, fortune inspection personnel can decide whether to need to safeguard in advance, so that fortune inspection personnel
It works more targeted, improves working efficiency, to save artificial.
Finally it should be noted that: technological means disclosed in this invention is not limited only to skill disclosed in above embodiment
Art means, also comprising being also not limited only to institute in above embodiment using embodiment composed by above technology any combination
The disconnecting switch of description, also comprising free voltage grade, the AC and DC disconnecting switch of any structure and skill disclosed in this invention
The new embodiment formed after any combination of art means, all within the scope of the present invention；It is of the invention not departing from
Under the premise of spirit and scope, when specifically applying on product, various changes and improvements may be made to the invention.
Claims (6)
1. one kind can measure the Intelligent isolation switch of conductor connection point and switch contact contact impedance, it is characterized in that disconnecting switch
Subsidiary loop in parallel on main power circuit；
The subsidiary loop includes simultaneously contact one, subsidiary loop static contact, subsidiary loop moving contact and contact two, subsidiary loop
Conducting wire, current transformer group one, measuring resistance；
The main power circuit of disconnecting switch is quiet comprising disconnecting switch inlet wire conducting wire, disconnecting switch inlet wire tie point, disconnecting switch
Contact, disconnecting switch moving contact, disconnecting switch swivel joint, disconnecting switch go out line connection point, disconnecting switch outgoing conductor；
The measuring resistance, subsidiary loop static contact, subsidiary loop moving contact are connected to subsidiary loop by subsidiary loop conducting wire
On；
The current transformer group one is mounted on subsidiary loop；
The current transformer group two is mounted on the main power circuit of disconnecting switch；
The current transformer group one, current transformer group two secondary circuit be electrically connected with monitoring device.
2. one kind according to claim 1 can measure conductor connection point and the intelligence of switch contact contact impedance is kept apart
It closes, it is characterized in that current transformer group one can be the current transformer of one or more different measurement ranges, current transformer
Group two is also possible to the current transformer of one or more different measurement ranges.
3. one kind according to claim 1 can measure conductor connection point and the intelligence of switch contact contact impedance is kept apart
It closes, it is characterized in that the measuring resistance in subsidiary loop can be the resistance an of fixed resistance value or the resistance of multiple fixed resistance values
The combination of series and parallel.
4. one kind according to claim 1 can measure conductor connection point and the intelligence of switch contact contact impedance is kept apart
It closes, it is characterized in that subsidiary loop static contact and auxiliary when disconnecting switch becomes disjunction state from closed state, in subsidiary loop
The disjunction of circuit moving contact elder generation, disjunction after the static contact isolation switch and disconnecting switch moving contact in the main power circuit of disconnecting switch；
When disconnecting switch becomes closed state from disjunction state, static contact isolation switch in the main power circuit of disconnecting switch and keep apart
It closes moving contact to be first closed, be closed after the subsidiary loop static contact and subsidiary loop moving contact in subsidiary loop.
5. one kind according to claim 1 can measure conductor connection point and the intelligence of switch contact contact impedance is kept apart
It closes, it is characterized in that can measure in main power circuit and appoint by adjusting the position of in subsidiary loop and contact one and contact two
The contact impedance of what independent position or multiple part combinations.
6. one kind according to claim 1 can measure conductor connection point and the intelligence of switch contact contact impedance is kept apart
It closes, it is characterized in that monitoring device has data-transformation facility, data can be transmitted by wired or wireless mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357534.8A CN110391108A (en) | 2018-04-20 | 2018-04-20 | A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance |
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| CN201810357534.8A CN110391108A (en) | 2018-04-20 | 2018-04-20 | A kind of Intelligent isolation switch that can measure conductor connection point and switch contact contact impedance |
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|---|---|---|---|---|
| CN112067981A (en) * | 2020-07-30 | 2020-12-11 | 大唐大丰风电开发有限公司 | Real-time monitoring system for isolating switch |
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