CN110031696A - A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model - Google Patents
A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model Download PDFInfo
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- CN110031696A CN110031696A CN201910168402.5A CN201910168402A CN110031696A CN 110031696 A CN110031696 A CN 110031696A CN 201910168402 A CN201910168402 A CN 201910168402A CN 110031696 A CN110031696 A CN 110031696A
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- direct
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- induced voltage
- ground capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Models, including first resistor, second resistance, 3rd resistor, 4th resistance, 5th resistance, first reactance, second reactance, third reactance, first induced voltage sources, second induced voltage sources, third induced voltage sources, 4th induced voltage sources, 5th induced voltage sources, 6th sense answers voltage source, first direct-to-ground capacitance, second direct-to-ground capacitance, third direct-to-ground capacitance, 4th direct-to-ground capacitance, 5th direct-to-ground capacitance, 6th direct-to-ground capacitance and ground return circuit resistance, the circuit model can analyze the circulation characteristic of 330kV cross-linked polyethylene insulated cable protective metal shell.
Description
Technical field
The invention belongs to supergrid cable power transmission technical fields, are related to a kind of 330kV XLPE cable metal sheath
Type Equivalent Circuit Model.
Background technique
City size, which constantly expands, requires 330kV power supply point that can be directly entered main city zone load center, using 330kV etc.
The crosslinked cable route of grade is imperative.
However, higher induced potential can be generated in metal sheath when cable length is longer.Simultaneously as cable is straight
It connects on laying and metallic support, the coupled capacitor with higher between the earth.In long range 330kV cable run, cable
Metal sheath is generally by the way of cross connection grounding, as shown in Figure 1, the induced potential control at cross interconnected section of both ends is existed
Within specified value.Under normal operating conditions, circulation can be generated on cable metal sheath.When protective metal shell circulation is excessive, meeting
So that metal sheath is generated heat, accelerates cable major insulation and jacket insulation aging, reduce the service life of cable, and will affect
The current-carrying capability of 330kV cable.Therefore, how to be protected by accurate modeling analysis 330kV cross-linked polyethylene insulated cable metal
Lantern ring properties of flow provides technical basis for the design of 330kV cable run, construction and O&M, becomes the Northwest's 330kV cable
Problem in the urgent need to address in the development of road.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of 330kV XLPE cable metal shield is provided
Layer Type Equivalent Circuit Model, the circuit model can analyze the circulation characteristic of 330kV cross-linked polyethylene insulated cable protective metal shell.
In order to achieve the above objectives, 330kV XLPE cable metal sheath Type Equivalent Circuit Model of the present invention includes first
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first reactance, the second reactance, third reactance, the first induction
Voltage source, the second induced voltage sources, third induced voltage sources, the 4th induced voltage sources, the 5th induced voltage sources, 6th sense answer electricity
Potential source, the first direct-to-ground capacitance, the second direct-to-ground capacitance, third direct-to-ground capacitance, the 4th direct-to-ground capacitance, the 5th direct-to-ground capacitance, the 6th pair
Ground capacitor and ground return circuit resistance；
One end of first resistor successively one end phase through the first reactance and the first induced voltage sources and the second induced voltage sources
Connection；
One end of second resistance successively one end phase through the second reactance and third induced voltage sources and the 4th induced voltage sources
Connection；
One end phase of voltage source is successively answered with 6th sense through third reactance and the 5th induced voltage sources in one end of 3rd resistor
Connection；
The other end of first resistor and one end of the first direct-to-ground capacitance, the other end of second resistance, 3rd resistor it is another
End, one end of the second direct-to-ground capacitance, one end of third direct-to-ground capacitance and the 4th resistance one end be connected, the 4th resistance it is another
The other end and ground return circuit at end, the other end of the first direct-to-ground capacitance, the other end of the second direct-to-ground capacitance and third direct-to-ground capacitance
One end of resistance is connected；
One end of the other end of second induced voltage sources and the 4th direct-to-ground capacitance, one end of the 5th direct-to-ground capacitance, the 6th pair
One end of ground capacitor, the other end of the 4th induced voltage sources, 6th sense answer the other end of voltage source and one end phase of the 5th resistance
Connection, the other end, the 5th direct-to-ground capacitance of the other end of the other end of ground return circuit resistance and the 5th resistance, the 4th direct-to-ground capacitance
The other end and the other end of the 6th direct-to-ground capacitance be connected.
Three sections of protective metal shells that the voltage of first induced voltage sources is equal to the interconnection for constituting first time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；
The voltage of second induced voltage sources is adjacent equal to three sections of protective metal shells of interconnection of protective metal shell are returned with composition first
Sheath caused by induced voltage；
Three sections of protective metal shells that the voltage of third induced voltage sources is equal to the interconnection for constituting second time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；
The voltage of 4th induced voltage sources is adjacent equal to three sections of protective metal shells of interconnection of protective metal shell are returned with composition second
Sheath caused by induced voltage；
Three sections of protective metal shells that the voltage of 5th induced voltage sources is equal to the interconnection for constituting third time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；
It is adjacent with third time three sections of protective metal shells of interconnection of protective metal shell are constituted that 6th sense answers the voltage of voltage source to be equal to
Sheath caused by induced voltage.
It is electric over the ground that the capacitance of first direct-to-ground capacitance and the capacitance of the 4th direct-to-ground capacitance are equal to first time protective metal shell
The 1/2 of capacitance；
It is electric over the ground that the capacitance of second direct-to-ground capacitance and the capacitance of the 5th direct-to-ground capacitance are equal to second time protective metal shell
The 1/2 of capacitance；
It is electric over the ground that the capacitance of third direct-to-ground capacitance and the capacitance of the 6th direct-to-ground capacitance are equal to third time protective metal shell
The 1/2 of capacitance.
The resistance value of the resistance value of first resistor, the resistance value of second resistance and 3rd resistor is equal to the electricity of protective metal shell
Resistance value.
The resistance value of 4th resistance is equal to the grounding resistance of protective metal shell one end, and the resistance value of the 5th resistance is equal to metal
The grounding resistance of the sheath other end.
The reactance value of first reactance is equal with the reactance value of the reactance value of the second reactance and third reactance.
The invention has the following advantages:
The present invention passes through building 330kV XLPE cable metal sheath Type Equivalent Circuit Model, in practical operation, Ke Yili
The circulation of metal sheath is calculated with the 330kV XLPE cable metal sheath Type Equivalent Circuit Model, is crosslinked poly- second to analyze 330kV
The circulation characteristic of alkene insulated cable protective metal shell is evaded to optimize in the design phase to cable laying and earthing mode
The problem of being likely to occur in operation reduces accident probability, accident prevention ability is improved, to the Northwest's 330kV cable run
Development and the promotion of urban distribution network power supply reliability are of great significance.
Detailed description of the invention
Fig. 1 is 330kV XLPE cable cross connection grounding schematic diagram；
Fig. 2 is circuit diagram of the invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 2,330kV XLPE cable metal sheath Type Equivalent Circuit Model of the present invention include first resistor R1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first reactance L1, the second reactance L2, third reactance L3,
First induced voltage sources Ua1, the second induced voltage sources Ua2, third induced voltage sources Ub1, the 4th induced voltage sources Ub2, the 5th
Induced voltage sources Uc1,6th sense answer voltage source Uc2, the first direct-to-ground capacitance C1, the second direct-to-ground capacitance C2, third direct-to-ground capacitance C3,
4th direct-to-ground capacitance C4, the 5th direct-to-ground capacitance C5, the 6th direct-to-ground capacitance C6 and ground return circuit resistance Re；One end of first resistor R1
Successively it is connected through the first reactance L1 and the first induced voltage sources Ua1 with one end of the second induced voltage sources Ua2；Second resistance R2
One end be successively connected through the second reactance L2 and third induced voltage sources Ub1 with one end of the 4th induced voltage sources Ub2；Third
Successively one end of voltage source Uc2 is answered to be connected with 6th sense through third reactance L3 and the 5th induced voltage sources Uc1 in one end of resistance R3
It connects；One end of the other end of first resistor R1 and the first direct-to-ground capacitance C1, the other end of second resistance R2,3rd resistor R3
The other end, one end of the second direct-to-ground capacitance C2, one end of third direct-to-ground capacitance C3 and the 4th resistance R4 one end be connected, the 4th
The other end of resistance R4, the other end of the first direct-to-ground capacitance C1, the other end of the second direct-to-ground capacitance C2 and third direct-to-ground capacitance C3
The other end be connected with one end of ground return circuit resistance Re；The other end and the 4th direct-to-ground capacitance of second induced voltage sources Ua2
One end of C4, one end of the 5th direct-to-ground capacitance C5, one end of the 6th direct-to-ground capacitance C6, the 4th induced voltage sources Ub2 the other end,
6th sense answers the other end of voltage source Uc2 and one end of the 5th resistance R5 to be connected, the other end of ground return circuit resistance Re and
The other end of five resistance R5, the other end of the 4th direct-to-ground capacitance C4, the 5th direct-to-ground capacitance C5 the other end and the 6th direct-to-ground capacitance
The other end of C6 is connected.
Three sections of protective metal shells that the voltage of first induced voltage sources is equal to the interconnection for constituting first time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；The voltage of second induced voltage sources is equal to the interconnection that protective metal shell is returned with composition first
The adjacent sheath of three sections of protective metal shells caused by induced voltage；The voltage of third induced voltage sources, which is equal to, constitutes second time metal
Induced voltage caused by the cable core that three sections of protective metal shells of the interconnection of sheath respectively wrap up；The voltage of 4th induced voltage sources
Equal to returning induced voltage caused by the adjacent sheath of three sections of protective metal shells of interconnection of protective metal shell with composition second；5th induction
The cable core that three sections of protective metal shells that the voltage of voltage source is equal to the interconnection for constituting third time protective metal shell respectively wrap up causes
Induced voltage；6th sense answers the voltage of voltage source to be equal to three sections of protective metal shell phases with the interconnection for constituting third time protective metal shell
Induced voltage caused by adjacent sheath.
It is electric over the ground that the capacitance of first direct-to-ground capacitance and the capacitance of the 4th direct-to-ground capacitance are equal to first time protective metal shell
The 1/2 of capacitance；The capacitance of second direct-to-ground capacitance and the capacitance of the 5th direct-to-ground capacitance are equal to second time protective metal shell over the ground
The 1/2 of capacitance；The capacitance of third direct-to-ground capacitance and the capacitance of the 6th direct-to-ground capacitance are equal to third and return protective metal shell pair
The 1/2 of ground capacitance.
The resistance value of the resistance value of first resistor R1, the resistance value of second resistance R2 and 3rd resistor R3 is equal to metal shield
The resistance value of set；The resistance value of 4th resistance R4 is equal to the grounding resistance of protective metal shell one end, the resistance value of the 5th resistance R5
Equal to the grounding resistance of the protective metal shell other end.
The reactance value of first reactance L1 is equal with the reactance value of the reactance value of the second reactance L2 and third reactance L3.
The present invention comprehensively considers cable installation on bracket, and it is metal that there are certain capacitors between the earth
The calculating of layer circulation provides more fine theoretical foundation.
Claims (6)
1. a kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model, which is characterized in that including first resistor (R1), second
Resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the first reactance (L1), the second reactance (L2),
Three reactance (L3), the first induced voltage sources (Ua1), the second induced voltage sources (Ua2), third induced voltage sources (Ub1), the 4th sense
Voltage source (Ub2), the 5th induced voltage sources (Uc1), 6th sense is answered to answer voltage source (Uc2), the first direct-to-ground capacitance (C1), second pair
Ground capacitor (C2), third direct-to-ground capacitance (C3), the 4th direct-to-ground capacitance (C4), the 5th direct-to-ground capacitance (C5), the 6th direct-to-ground capacitance
(C6) and ground return circuit resistance (Re)；
One end of first resistor (R1) is successively through the first reactance (L1) and the first induced voltage sources (Ua1) and the second induced voltage sources
(Ua2) one end is connected；
One end of second resistance (R2) is successively through the second reactance (L2) and third induced voltage sources (Ub1) and the 4th induced voltage sources
(Ub2) one end is connected；
Voltage source successively is answered through third reactance (L3) and the 5th induced voltage sources (Uc1) and 6th sense in one end of 3rd resistor (R3)
(Uc2) one end is connected；
The other end of first resistor (R1) and one end of the first direct-to-ground capacitance (C1), the other end of second resistance (R2), third electricity
Hinder the other end of (R3), one end of the second direct-to-ground capacitance (C2), one end of third direct-to-ground capacitance (C3) and the 4th resistance (R4)
One end is connected, the other end of the 4th resistance (R4), the other end of the first direct-to-ground capacitance (C1), the second direct-to-ground capacitance (C2) it is another
The other end of one end and third direct-to-ground capacitance (C3) is connected with the one end of ground return circuit resistance (Re)；
One end of the other end of second induced voltage sources (Ua2) and the 4th direct-to-ground capacitance (C4), the 5th direct-to-ground capacitance (C5) one
End, one end of the 6th direct-to-ground capacitance (C6), the other end of the 4th induced voltage sources (Ub2), 6th sense answer the another of voltage source (Uc2)
One end and one end of the 5th resistance (R5) are connected, and the other end of ground return circuit resistance (Re) is another with the 5th resistance (R5)
End, the other end of the 4th direct-to-ground capacitance (C4), the other end of the 5th direct-to-ground capacitance (C5) and the 6th direct-to-ground capacitance (C6) it is another
End is connected.
2. 330kV XLPE cable metal sheath Type Equivalent Circuit Model according to claim 1, which is characterized in that the first sense
The voltage of voltage source (Ua1) is answered to be equal to the cable that three sections of protective metal shells of the interconnection for constituting first time protective metal shell respectively wrap up
Induced voltage caused by core；
The voltage of second induced voltage sources (Ua2) is adjacent equal to three sections of protective metal shells of interconnection of protective metal shell are returned with composition first
Sheath caused by induced voltage；
Three sections of protective metal shells that the voltage of third induced voltage sources (Ub1) is equal to the interconnection for constituting second time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；
The voltage of 4th induced voltage sources (Ub2) is adjacent equal to three sections of protective metal shells of interconnection of protective metal shell are returned with composition second
Sheath caused by induced voltage；
Three sections of protective metal shells that the voltage of 5th induced voltage sources (Uc1) is equal to the interconnection for constituting third time protective metal shell respectively wrap
Induced voltage caused by the cable core wrapped up in；
It is adjacent with third time three sections of protective metal shells of interconnection of protective metal shell are constituted that 6th sense answers the voltage of voltage source (Uc2) to be equal to
Sheath caused by induced voltage.
3. 330kV XLPE cable metal sheath Type Equivalent Circuit Model according to claim 1, which is characterized in that first pair
The capacitance of ground capacitor (C1) and the capacitance of the 4th direct-to-ground capacitance (C4) are equal to first time protective metal shell direct-to-ground capacitance value
1/2；
The capacitance of second direct-to-ground capacitance (C2) and the capacitance of the 5th direct-to-ground capacitance (C5) are equal to second time protective metal shell
The 1/2 of direct-to-ground capacitance value；
The capacitance of third direct-to-ground capacitance (C3) and the capacitance of the 6th direct-to-ground capacitance (C6) are equal to third and return protective metal shell
The 1/2 of direct-to-ground capacitance value.
4. 330kV XLPE cable metal sheath Type Equivalent Circuit Model according to claim 1, which is characterized in that the first electricity
The resistance value for hindering the resistance value of (R1), the resistance value of second resistance (R2) and 3rd resistor (R3) is equal to the resistance of protective metal shell
Value.
5. 330kV XLPE cable metal sheath Type Equivalent Circuit Model according to claim 1, which is characterized in that the 4th electricity
The resistance value for hindering (R4) is equal to the grounding resistance of protective metal shell one end, and it is another that the resistance value of the 5th resistance (R5) is equal to protective metal shell
The grounding resistance of one end.
6. 330kV XLPE cable metal sheath Type Equivalent Circuit Model according to claim 1, which is characterized in that the first electricity
The reactance value of anti-(L1) is equal with the reactance value of the reactance value of the second reactance (L2) and third reactance (L3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168402.5A CN110031696A (en) | 2019-03-06 | 2019-03-06 | A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168402.5A CN110031696A (en) | 2019-03-06 | 2019-03-06 | A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model |
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| Publication Number | Publication Date |
|---|---|
| CN110031696A true CN110031696A (en) | 2019-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910168402.5A Pending CN110031696A (en) | 2019-03-06 | 2019-03-06 | A kind of 330kV XLPE cable metal sheath Type Equivalent Circuit Model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089108A (en) * | 2021-11-17 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Cable sheath defect identification method, device, equipment and readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635585A (en) * | 2004-12-15 | 2005-07-06 | 江苏省电力公司南京供电公司 | Method for inhibiting induced current of power cable sheath |
| CN108152662A (en) * | 2017-11-24 | 2018-06-12 | 国网浙江省电力公司台州供电公司 | A kind of cross interconnected box fault diagnosis method and system based on earth current |
| CN108427835A (en) * | 2018-03-01 | 2018-08-21 | 华南理工大学 | A kind of power cable sheath calculation of circulating current method |
| CN109001519A (en) * | 2018-09-10 | 2018-12-14 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrification positioning cable outer jacket breaks the apparatus and method of protective metal shell grounding point outside |
-
2019
- 2019-03-06 CN CN201910168402.5A patent/CN110031696A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635585A (en) * | 2004-12-15 | 2005-07-06 | 江苏省电力公司南京供电公司 | Method for inhibiting induced current of power cable sheath |
| CN108152662A (en) * | 2017-11-24 | 2018-06-12 | 国网浙江省电力公司台州供电公司 | A kind of cross interconnected box fault diagnosis method and system based on earth current |
| CN108427835A (en) * | 2018-03-01 | 2018-08-21 | 华南理工大学 | A kind of power cable sheath calculation of circulating current method |
| CN109001519A (en) * | 2018-09-10 | 2018-12-14 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrification positioning cable outer jacket breaks the apparatus and method of protective metal shell grounding point outside |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089108A (en) * | 2021-11-17 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Cable sheath defect identification method, device, equipment and readable storage medium |
| CN114089108B (en) * | 2021-11-17 | 2022-08-02 | 广东电网有限责任公司广州供电局 | Cable sheath defect identification method, device, equipment and readable storage medium |
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