CN110045188A - A kind of system and method for not removing high-side lead measuring transformer insulation resistance - Google Patents
A kind of system and method for not removing high-side lead measuring transformer insulation resistance Download PDFInfo
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- CN110045188A CN110045188A CN201910239548.4A CN201910239548A CN110045188A CN 110045188 A CN110045188 A CN 110045188A CN 201910239548 A CN201910239548 A CN 201910239548A CN 110045188 A CN110045188 A CN 110045188A
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- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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Abstract
The invention discloses the system and methods that one kind does not remove high-side lead measuring transformer insulation resistance, which is characterized in that including the bridge circuit being made of equivalent of the apparatus outside measurement power supply, first resistor R1, second resistance R2, calibration resistance r, transformer and line；The exit of the neutral conductor exit and U-shaped three-phase output end A, B, C short circuit of high-voltage end of step-up side together is respectively connected to by the first resistor R1 and second resistance R2 of two parallel branches connecting with measurement power supply, the neutral conductor therein draws branch and is serially connected with calibration resistance, and the resistor satisfied preset relation condition with transformer T-type equivalent circuit.By adjusting parallel branch second resistance R2 therein, " electric bridge " is made to reach the balanced voltage received and lie prostrate grade.Staff can be in the case where not tearing transformer lead open as a result, calculating transformer insulating resistance value, and the efficiency and safety of Insulation Resistance of Transformer maintenance related work can be improved.
Description
Technical field
The present invention relates to power domains, do not remove high-side lead measuring transformer insulated electro more particularly, to one kind
The system of resistance.
Background technique
When transformer preventive trial, accurate measuring transformer insulating resistance value, needs to remove each side of transformer and mother
The lead that line or primary equipment are connected, then transformer is routinely tested.The transformation of especially 220kV, 500kV or more
Device, plane that cannula tip is liftoff have ten meters or more, and testing crew is ascended a height, and there are falling hazards, and need the high altitude operation of purchasing expensive
Vehicle, bucket arm vehicle and the Work tool for guaranteeing safety；Meanwhile taking out stitches and reconnection accounts for about the 40%~65% of entire test period,
Expend a large amount of man power and material；On the other hand, dismounting lead be easy to cause device clamp fracture, damage, it is also possible to cause to draw
The conducting rod poor contact of the device clamp and casing of line causes junction contacts resistance to increase and superheating phenomenon occurs；It is also possible to
Because of the equipment safeties hidden danger such as leader cable insulation harm and bushing for transformer leakage of oil caused by disconnecting lead.
Current transformer without disconnecting power lead measurement insulation resistance method includes following patent: CN101354418 and
CN102735959。
CN101354418 is to measure one group of insulation resistance data before transformer puts into operation in the case where not connecing each side lead to do
For " initial data ", one group of insulation resistance data is measured again as " basic data ", whenever to this transformation after connecting each side lead
When device is done experiment, in the case where not removing the lead that transformer is connected with other equipment, by the test data obtained and " basis
Data " are compared.
CN102735959 is by insulating resistance value and the resistance value ratio corresponding in " initial data " in " measurement data "
Compared with then exhausted when the insulating resistance value in " measurement data " is more than or equal to 1.3 times of " initial data " corresponding insulating resistance value
Edge is good；When at least one group insulating resistance value in " measurement data " is less than the 1.3 of " initial data " corresponding insulating resistance value
Times, but when insulating resistance value corresponding greater than " initial data ", it will be compared with insulating resistance value in " basic data ", " measurement data "
It is good more than or equal to insulating between 0.7 times of winding for corresponding to insulating resistance value in " basic data ".When one group in " measurement data "
Or two groups of insulating resistance values need to examine transformer oil when being less than 0.7 times of corresponding insulating resistance value in " basic data ".When
Insulation resistance numerical value in " measurement data " is respectively less than 0.7 times or " measurement number of corresponding insulating resistance value in " basic data "
According to " in insulating resistance value be less than or equal to " initial data " in corresponding insulating resistance value, transformer return repair in shop reason.Both hairs
Bright patent is not the method that insulating resistance value is measured under transformer without disconnecting power lead state.
In addition, hydroelectric project office, Jiangxi Province Fan Hong space etc. studies " housing shroud method " " Jiangxi Electric Power " the 5th phase in 2010
Measuring transformer insulation resistance, dismantles the ground line of neutral point, low-pressure side sleeve lead-out line, iron core and folder, and uses insulating tape
It fixes, the insulation resistance between iron core, folder can only be measured between winding, be not step-up side to the low insulated electro with ground
Resistance, cannot reflect transformer insulation state.
According to the above-mentioned prior art it is found that wanting measuring transformer insulation resistance, it is necessary to remove and transformer bus or one
The connected lead of secondary device, needs to expend a large amount of manpower, financial resources and material resources.The insulation resistance side of transformer without disconnecting power lead at present
" the basis that method measurement is transformer without disconnecting power lead measurement obtained insulating resistance value and " initial data " taken out stitches and is not taken out stitches
Data " comparison, according to the variation of measure without disconnection Insulation Resistance of Transformer value, judges whether transformer insulation state is good.This
Kind do not remove the insulating resistance value method of lead transformer because transformer and bus and or primary equipment connect, be not capable of measuring
The insulating resistance value of transformer is unable to accurate judgement transformer insulation state and changing rule, only transformer insulated as judging
Whether resistance is in range of normal value.
Summary of the invention
The present invention is to overcome defect described in the above-mentioned prior art, the insulating resistance value of measuring transformer, thus more acurrate
Judge transformer insulation state and changing rule, a kind of system for not removing high-side lead measuring transformer insulation resistance is provided
And method.
In order to solve the above technical problems, technical scheme is as follows:
A kind of system for not removing high-side lead measuring transformer insulation resistance, comprising: measurement power supply, first resistor
R1, second resistance R2, calibration resistance r, transformer and the outer equivalent of the apparatus of line；
The measurement power supply has line end L, shielding end G and ground terminal E；
The transformer has high-voltage end and low-pressure end, and the high-voltage end has the neutral conductor and high pressure three-phase output end A, B
And C, the low-pressure end have low voltage three-phase output end a, b and c；
The line end L of the measurement power supply is electrically connected with the input terminal of first resistor R1 and second resistance R2 respectively；
The input terminal of the calibration resistance r is electrically connected with the output end of first resistor R1, and the neutral conductor is corresponding by the neutral conductor
Exit with calibration resistance r output end be electrically connected；
Described high pressure three-phase output end A, B and C pass through after corresponding exit A1, B1 and C1 are shorted respectively and are connected to
The output end of second resistance R2；
The output end of described high pressure three-phase output end A, B and C and second resistance R2 is also electrically connected with equivalent of the apparatus outside line, institute
State earth after low voltage three-phase output end a, b and c are shorted；
Described high pressure three-phase output end A, B and C have and are connected to the porcelain vase of the shielding end G of measurement power supply.
The principle of the above-mentioned system for not removing high-side lead measuring transformer insulation resistance is: power supply and two parallel connections
Equivalent of the apparatus connects into bridge circuit outside resistance R1 and R2, calibration resistance r, transformer and the line that connect with transformer.Pass through
The resistance of two parallel branches connected to power supply be respectively connected to step-up side neutral conductor exit and high pressure three-phase it is defeated
The exit that outlet A, B, C are shorted, the neutral conductor therein draw branch and are serially connected with calibration resistance, and the resistance with transformer itself
Meet preset relation condition.By adjusting parallel branch resistance therein, electric bridge is made to reach the balanced voltage received and lie prostrate grade, thus
In the case where not tearing transformer lead open, insulating resistance value is calculated.
Preferably, the second resistance R2 is adjustable resistance.
Preferably, further comprise PID regulator for adjusting the resistance value of the second resistance R2.
It preferably, further comprise nanovoltmeter, when the both ends of the first resistor R1 are electrically connected with nanovoltmeter, measurement the
The voltage value △ u at one both ends resistance R1；
Part between the output end and calibration resistance r of the first resistor R1 as electric bridge bridge arm takes point p1, in institute
Exit that the output end and high pressure three-phase output end A, B and C for stating second resistance R2 are shorted and before connecing as electric bridge bridge arm
Part takes point p2, when the point p1 and p2 is connect with nanovoltmeter, measures p1 and p2 point-to-point transmission voltage value △ v.
Preferably, the first resistor R1 is measuring resistance.
Preferably, when the resistance value of the first resistor R1 is r1, the resistance value of second resistance R2 is r2, and 3rd resistor
When the resistance value for demarcating resistance r is r, first resistor R1, second resistance R2 and calibration resistance r meet the following conditions:
r+r1=r2。
Preferably, the PID regulator is used by closed-loop control, and detailed process is as follows:
The first resistor R1, second resistance R2 are set first and demarcates the resistance value of resistance r, further to PID tune
Section device is set, and by the resistance value of driving adjustment second resistance R2, then further judges following measuring condition:
|△v|≤1(nV)
If conditions are not met, then resetting the first resistor R1, second resistance R2 and demarcating the resistance value of resistance r.
Preferably, the measurement power supply is Insulation Resistance Tester.
Preferably, the transformer has the iron core folder of ground connection.
A kind of measurement method using the aforementioned system for not removing high-side lead measuring transformer insulation resistance, by closing
Ring control adjusts the resistance value of the second resistance R2, and nanovoltmeter is made to measure p1 and p2 point-to-point transmission voltage value | △ v | it is received less than 1
Volt, while the voltage △ u at the both ends first resistor R1 is measured, supply voltage value is set as E, is calculate by the following formula:
Zx=(R1×E)÷(2×△u)
Obtain the insulating resistance value Z of transformerx。
Compared with prior art, the beneficial effect of technical solution of the present invention is:
The present invention is in order to realize that transformer without disconnecting power lead calculates the technical solution of insulating resistance value, by two of power supply connection
The resistance of parallel branch is respectively connected to the neutral conductor exit of step-up side and drawing for high pressure three-phase output end A, B, C short circuit
Outlet, the neutral conductor therein draws branch and is serially connected with calibration resistance, and closes with resistor satisfied certain algebraical sum in transformer
System.By adjusting parallel branch resistance therein, " electric bridge " is set to reach the balanced voltage received and lie prostrate grade, so that calculating transformer is exhausted
Edge resistance value.As a result, work about electric power personnel can in the case where not tearing transformer lead open measuring transformer insulating resistance value,
To judge transformer insulation state and changing rule；Simultaneously because transformer and its connected equipment not being dismantled or being broken
Lead is opened, working efficiency and safety can be effectively improved.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for not removing the system of high-side lead measuring transformer insulation resistance.
Fig. 2 is closed-loop control flow chart.
Fig. 3 is transformer T-type equivalent circuit diagram.
Wherein, 1 measurement power supply is represented, 2 represent transformer, and 21 represent step-up side, and 21 represent step-down side,
23 represent iron core folder, and 3 represent the outer equivalent of the apparatus of line, and 41,42 represent nanovoltmeter；
R1 is first resistor R1, and R2 is second resistance R2, and r is that calibration resistance r, r1 and r2 are respectively that transformer T-type is equivalent
First equivalent resistance r1 of circuit and the second equivalent resistance r2, r3 is the equivalent insulation resistance of transformer T-type equivalent circuit, A, B
It is respectively high pressure three-phase output end A, B and C with C, A1, B1 and C1 are respectively the extraction that high pressure three-phase output end A, B and C are shorted
End, p1 is for first resistor R1 and demarcates the node that takes between resistance r, p2 for R2 output end with A1, B1 and C1 and before connecing it
Between the node that is taken, O is neutral conductor exit, and a, b and c are low voltage three-phase output end, and L represents line end, and G represents shielding end, E generation
Table ground terminal.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
A kind of system for not removing high-side lead measuring transformer insulation resistance, as shown in Figure 1, comprising: measurement power supply
1, first resistor R1, second resistance R2, calibration resistance r, transformer 2 and the outer equivalent of the apparatus 3 of line；
The measurement power supply 1 has line end L, shielding end G and ground terminal E；
The transformer 2 has high-voltage end 21 and low-pressure end 22, and the high-voltage end 21 has the neutral conductor and high pressure three-phase defeated
Outlet A, B and C, the low-pressure end 22 have low voltage three-phase output end a, b and c；
The line end L of the measurement power supply 1 is electrically connected with the input terminal of first resistor R1 and second resistance R2 respectively；
The input terminal of the calibration resistance r is electrically connected with the output end of first resistor R1, and the neutral conductor is corresponding by the neutral conductor
Exit O with calibration resistance r output end be electrically connected；
Described high pressure three-phase output end A, B and C pass through after corresponding exit A1, B1 and C1 are shorted respectively and are connected to
The output end of second resistance R2；
The output end of described high pressure three-phase output end A, B and C and second resistance R2 is also electrically connected with equivalent of the apparatus 3 outside line,
Earth after described low voltage three-phase output end a, b and c are shorted；
Described high pressure three-phase output end A, B and C have and are connected to the porcelain vase of the shielding end G of measurement power supply 1.
More specifically, which is that transformer high-voltage covers porcelain vase pipe, measures shell, the first resistor of the measurement power supply 1
The shell of R1, the shell of second resistance R2 and demarcate resistance r cage connection and be grounded composition shielding harness.
In the mode that another is implemented, the second resistance R2 is adjustable resistance.
It further comprise the PID tune for adjusting the resistance value of the second resistance R2 in the mode that another is implemented
Save device.
Another implement mode in, further comprise nanovoltmeter 41,42, when the both ends of the first resistor R1 with receive
When lying prostrate the electrical connection of table 41, the voltage value △ u at the both ends first resistor R1 is measured；
Part between the output end and calibration resistance r of the first resistor R1 as electric bridge bridge arm takes point p1, in institute
Exit that the output end and high pressure three-phase output end A, B and C for stating second resistance R2 are shorted and before connecing as electric bridge bridge arm
Part takes point p2, when the point p1 and p2 is connect with nanovoltmeter 42, measures p1 and p2 point-to-point transmission voltage value △ v.
In the mode that another is implemented, the first resistor R1 is measuring resistance.
In the mode that another is implemented, when the resistance value of the first resistor R1 is r1, the resistance value of second resistance R2
For r2, and 3rd resistor calibration resistance r resistance value be r when, first resistor R1, second resistance R2 and calibration resistance r meet with
Lower condition:
r+r1=r2。
In the mode that another is implemented, the PID regulator is used by closed-loop control as shown in Figure 3, specifically
Process is as follows:
The first resistor R1, second resistance R2 are set first and demarcates the resistance value of resistance r, further to PID tune
Section device is set, and by the resistance value of driving adjustment second resistance R2, then further judges following measuring condition:
|△v|≤1(nV)
If conditions are not met, then resetting the first resistor R1, second resistance R2 and demarcating the resistance value of resistance r.
In the mode that another is implemented, the measurement power supply 1 is Insulation Resistance Tester.
In the mode that another is implemented, the transformer 2 has the iron core folder 23 of ground connection.
A kind of measurement method based on the above-mentioned system for not removing high-side lead measuring transformer insulation resistance, by closing
Ring control adjusts the resistance value of the second resistance R2, and nanovoltmeter is made to measure p1 and p2 point-to-point transmission voltage value | △ v | it is received less than 1
Volt, while the voltage △ u at the both ends first resistor R1 is measured, supply voltage value is set as E, is calculate by the following formula:
Zx=(R1×E)÷(2×△u)
Obtain the insulating resistance value Z of transformer 2x。
For component simpler, that clearly expression transformer 2 is constituted in system proposed by the present invention and structure, Fig. 3
Transformer T-type equivalent circuit diagram is shown, wherein it is seen that, in the lead representative that the input terminal of the first equivalent resistance r1 is connect
Property line and with calibration resistance r output end be electrically connected, the second equivalent resistance r2 represents high-voltage end 21, and output end is defeated as three-phase
Outlet is shorted to exit, and the output end of second resistance R2 is electrically connected to the outer equivalent of the apparatus 3 of line by the exit.Equivalent insulation
The output end of resistance r3 is grounded, the input terminal input terminal with the output end of the first equivalent resistance r1 and the second equivalent resistance r2 respectively
Electrical connection, thus, it is possible to represent the actual insulation resistance of transformer 2.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. the system that one kind does not remove high-side lead measuring transformer insulation resistance characterized by comprising measurement power supply
(1), first resistor R1, second resistance R2, calibration resistance r, transformer (2) and the outer equivalent of the apparatus (3) of line；
The measurement power supply (1) has line end L, shielding end G and ground terminal E；
The transformer (2) has high-voltage end (21) and low-pressure end (22), and the high-voltage end (21) has the neutral conductor and high pressure three
Phase output terminal A, B and C, the low-pressure end (22) have low voltage three-phase output end a, b and c；
The line end L of measurement power supply (1) is electrically connected with the input terminal of first resistor R1 and second resistance R2 respectively；
The input terminal of the calibration resistance r is electrically connected with the output end of first resistor R1, and the neutral conductor draws by the way that the neutral conductor is corresponding
Outlet O is electrically connected with the output end of calibration resistance r；
Described high pressure three-phase output end A, B and C pass through after corresponding exit A1, B1 and C1 are shorted respectively and are connected to second
The output end of resistance R2；
The output end of described high pressure three-phase output end A, B and C and second resistance R2 is also electrically connected with equivalent of the apparatus outside line (3), institute
State earth after low voltage three-phase output end a, b and c are shorted；
Described high pressure three-phase output end A, B and C have and are connected to the porcelain vase of the shielding end G of measurement power supply (1).
2. the system according to claim 1 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
The second resistance R2 is adjustable resistance.
3. the system according to claim 2 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
It further comprise the PID regulator for adjusting the resistance value of the second resistance R2.
4. the system according to claim 3 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
It further comprise nanovoltmeter (41,42), when the both ends of the first resistor R1 are electrically connected with nanovoltmeter (41), the first electricity of measurement
Hinder the voltage value △ u at the both ends R1；
The first resistor R1 output end and calibration resistance r between take point p1, the second resistance R2 output end with
The exit that high pressure three-phase output end A, B and C the are shorted and part before connecing takes point p2, as the point p1 and p2 and nanovoltmeter (42)
When connection, p1 and p2 point-to-point transmission voltage value △ v is measured.
5. the system according to claim 1 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
The first resistor R1 is measuring resistance.
6. the system according to claim 5 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
When the resistance value of the first resistor R1 is r1, the resistance value of second resistance R2 is r2, and the resistance of 3rd resistor calibration resistance r
When value is r, first resistor R1, second resistance R2 and calibration resistance r meet the following conditions:
r+r1=r2。
7. the system for not removing high-side lead measuring transformer insulation resistance according to claim 4 and 6, feature exist
In the PID regulator is used by closed-loop control, and detailed process is as follows:
The first resistor R1, second resistance R2 are set first and demarcates the resistance value of resistance r, further to PID regulator
It is set, by the resistance value of driving adjustment second resistance R2, then further judges following measuring condition:
|△v|≤1(nV)
If conditions are not met, then resetting the first resistor R1, second resistance R2 and demarcating the resistance value of resistance r.
8. the system according to claim 1 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
The measurement power supply 1 is Insulation Resistance Tester.
9. the system according to claim 1 for not removing high-side lead measuring transformer insulation resistance, which is characterized in that
The transformer has the iron core folder (23) of ground connection.
10. a kind of measurement method for not removing high-side lead measuring transformer insulation resistance based on claim 7, feature
It is, the resistance value of the second resistance R2 is adjusted by closed-loop control, nanovoltmeter is made to measure p1 and p2 point-to-point transmission voltage value | △
V | receive volt less than 1, while measuring the voltage △ u at the both ends first resistor R1, supply voltage value is set as E, by following formula into
Row calculates:
Zx=(R1×E)÷(2×△u)
Obtain the insulating resistance value Z of transformerx。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910239548.4A CN110045188B (en) | 2019-03-27 | 2019-03-27 | System and method for measuring insulation resistance of transformer without dismounting high-voltage side lead |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910239548.4A CN110045188B (en) | 2019-03-27 | 2019-03-27 | System and method for measuring insulation resistance of transformer without dismounting high-voltage side lead |
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| CN110045188B CN110045188B (en) | 2021-03-02 |
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|---|---|---|---|---|
| CN110967544A (en) * | 2019-12-08 | 2020-04-07 | 山东电工电气集团智能电气有限公司 | Sleeve type voltage and current sensor for distribution transformer |
| CN110967544B (en) * | 2019-12-08 | 2022-02-18 | 山东电工电气集团智能电气有限公司 | Sleeve type voltage and current sensor for distribution transformer |
| CN111537797A (en) * | 2020-05-15 | 2020-08-14 | 广东电网有限责任公司 | System and method for measuring insulation resistance of transformer substation without disassembling lead |
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| CN110045188B (en) | 2021-03-02 |
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