CN113949051A - Cable metal sheath circulating current restraining device and method - Google Patents
Cable metal sheath circulating current restraining device and method Download PDFInfo
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- CN113949051A CN113949051A CN202111170410.7A CN202111170410A CN113949051A CN 113949051 A CN113949051 A CN 113949051A CN 202111170410 A CN202111170410 A CN 202111170410A CN 113949051 A CN113949051 A CN 113949051A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 314
- 239000002184 metal Substances 0.000 title claims abstract description 314
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000452 restraining effect Effects 0.000 title claims abstract description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 30
- 239000011787 zinc oxide Substances 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 8
- 239000004020 conductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The invention provides a cable metal sheath circulating current restraining device and a method, wherein the device comprises: the cable comprises a first cable metal sheath loop, a second cable metal sheath loop and a third cable metal sheath loop; the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop comprise three sections of metal sheaths; three sections of metal sheaths of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are crossed and interconnected; the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are respectively grounded through a circulation suppressor, and the circulation suppressor is used for suppressing circulation on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop. The scheme provided by the invention can inhibit sheath circulation and protect the circuit.
Description
Technical Field
The invention relates to the technical field of cable metal sheath circulation treatment, in particular to a cable metal sheath circulation restraining device and method.
Background
When the high-voltage single-core cable transmits power in a long distance, due to the fact that the induction voltage is too high and other factors are adopted for sectional connection, each three sections of the high-voltage single-core cable form a group of cross interconnection loops in a return circuit, the three sections are all completely equal in principle, the induction potential can be completely offset through three-phase cross interconnection, the grounding current is zero, however, due to the fact that various conditions are limited in an implementation field, the lengths of the three sections are inconsistent, or when the load currents of the three phases are not equal, the three-phase cross interconnection on the outer sheath of the cable can not be completely offset, a cable metal sheath circulating current is formed, sometimes, the sheath is heated seriously due to too large current, and the power transmission capacity of the cable is reduced. When a single-phase short-circuit fault occurs, the induced voltage flowing through the cable metal sheath is increased, instantaneous circulating current is increased, and then very high voltage is formed at the two ends of the inductor, so that the inductor can be burnt, and maintainers can be injured due to the high voltage formed at the two ends of the inductor.
Disclosure of Invention
The invention aims to provide a device and a method for inhibiting cable metal sheath circulation, which can effectively inhibit cable metal sheath circulation.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a cable metal sheath circulation restraining device comprising: the cable comprises a first cable metal sheath loop, a second cable metal sheath loop and a third cable metal sheath loop; wherein,
the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop comprise three sections of metal sheaths;
three sections of metal sheaths of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are crossed and interconnected;
the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are respectively grounded through a circulation suppressor, and the circulation suppressor is used for suppressing circulation on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop.
Optionally, the first cable metal sheath loop includes a first section of metal sheath, a second section of metal sheath, and a third section of metal sheath connected in sequence;
the second cable metal sheath loop comprises a fourth section of metal sheath, a fifth section of metal sheath and a sixth section of metal sheath which are sequentially connected;
the third cable metal sheath loop comprises a seventh section of metal sheath, an eighth section of metal sheath and a ninth section of metal sheath which are sequentially connected;
the first section of metal sheath is also electrically connected with the fifth section of metal sheath;
the second section of metal sheath is also electrically connected with the sixth section of metal sheath;
the fourth section of metal sheath is also electrically connected with the eighth section of metal sheath;
the fifth section of metal sheath is also electrically connected with the ninth section of metal sheath;
the sixth section of metal sheath is also electrically connected with the second section of metal sheath;
the seventh section of metal sheath is also electrically connected with the third section of metal sheath.
Optionally, the third section of metal jacket is grounded through the first circulation suppressor;
the sixth section of metal sheath is grounded through a second circulation suppressor;
the ninth section of metal sheath is grounded through a third circulation suppressor.
Optionally, the first circulation suppressor includes: the first inductor is electrically connected with the first zinc oxide valve plate;
the second circulation suppressor includes: the second inductor is electrically connected with the second zinc oxide valve plate;
the third circulation suppressor comprises: the third zinc oxide valve plate and a third inductor electrically connected with the third zinc oxide valve plate.
Optionally, the first section of metal sheath, the fourth section of metal sheath, and the seventh section of metal sheath are grounded.
Optionally, the circulating currents on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are obtained through the following steps:
acquiring induced voltage and mutual inductance combinations of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop according to parameters of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop;
obtaining a coefficient matrix according to the combination of the induced voltages and mutual inductance of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop;
and obtaining the circulating currents on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop according to the coefficient matrix.
Optionally, the cable metal sheath circulating current suppressing device further includes:
and the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are respectively provided with a return line which is grounded.
Optionally, the resistance on the return line satisfies:
(IF-IP)×R1-Ip×Zpp+IF×ZPA＝Ip×R2；
wherein, IPIs the current through the return line; IF is a short-circuit current to earth, ZPPA self-inductance impedance which is a return line and takes the ground as a loop; zPAThe lead and the return line of the first cable metal sheath loop respectively use the ground as the mutual inductance impedance of the loop, R2As ground resistance of the return line, R1Is a ground resistor.
Optionally, the voltage on the return line is obtained by the following formula:
EA＝(IF-Ip)×R1+IF×ZSA-Ip×ZPA
EB＝(IF-Ip)×Rl+IF×ZSB-Ip×ZPB
EC＝2(IF-Ip)×R1+IF×ZSC-Ip×ZPC
wherein E isAFor the first cable metallic sheath loop voltage, EBFor the second cable metallic sheath loop voltage, ECIs the third cable metal sheath loop voltage; zSAThe conductor of the first cable metal sheath loop and the fault phase conductor respectively use the earth as mutual inductance impedance, Z of the loopSBThe lead of the second cable metal sheath loop and the fault phase lead respectively use the ground as mutual inductance impedance of the loop; zSCThe lead of the third cable metal sheath loop and the fault phase lead respectively use the ground as mutual inductance impedance of the loop; zPBThe lead and the return line of the second cable metal sheath loop respectively use the ground as mutual inductance impedance of the loop; zPCAnd the lead and the return wire of the third cable metal sheath loop respectively use the ground as mutual inductance impedance of the loop.
The embodiment of the invention also provides a cable metal sheath circulating current restraining method, which comprises the following steps:
obtaining the circulation current on a first cable metal sheath loop, a second cable metal sheath loop and a third cable metal sheath loop;
and the circulating current is restrained by a circulating current suppressor which is respectively and electrically connected with the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop.
The scheme of the invention at least comprises the following beneficial effects:
according to the scheme, the three-phase sheath loop is respectively connected with the circulation suppressors in series, and when the induced voltage and circulation of the metal sheath of the cable are increased, the circulation suppressors can conduct the formed high voltage to the ground terminal in time, so that the circulation effect of the sheath of the cable is suppressed.
Drawings
FIG. 1 is a schematic view of a sheath circulation suppression apparatus of the present invention;
FIG. 2 is a sheath loop current calculation schematic of the present invention;
fig. 3 is a schematic diagram illustrating a shunting function of a single-phase ground fault occurring in a line according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the on-site installation of a return line in accordance with one embodiment of the present invention;
FIG. 5 shows a return line position in a situation where a cable gang is laid in a flat manner according to an embodiment of the present invention;
fig. 6 shows the position of the return line in the case of triangular placement of the cable gang according to an embodiment of the present invention.
The reference numbers illustrate: 1. a first section of metal sheath; 2. a second section of metal sheath; 3. a third section of metal sheath; 4. a fourth section of metal sheath; 5. a fifth section of metal sheath; 6. a sixth section of metal sheath; 7. a seventh section of metal sheath; 8. an eighth section of metal sheath; 9. a ninth section of metal sheath; 10. a zinc oxide valve plate; 11. an inductance;
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a cable metal sheath circulating current suppressing apparatus, including:
a first cable metal sheath loop A, a second cable metal sheath loop B and a third cable metal sheath loop C;
the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C comprise three sections of metal sheaths; three sections of metal sheaths of the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C are crossed and interconnected;
the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C are respectively grounded through a circulation suppressor, and the circulation suppressor is used for suppressing circulation on the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C.
In the embodiment, the three-phase cable metal sheath loop sections are crossed and interconnected, so that high induction voltage generated by the high-voltage single-core cable during long-distance power transmission can be reduced; meanwhile, three sections of metal sheaths of the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C are crossed and interconnected, so that part of induced potential can be offset, and current is reduced; the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C are respectively and electrically connected with a circulating current suppressor, and when a single-phase short circuit fault occurs, high voltage generated by the cable metal sheath is connected to the ground through the circulating current suppressor, so that circulating current is further suppressed, and the circuit is protected.
In an alternative embodiment of the invention, the first cable metallic sheath loop comprises: a first section of metal sheath 1, a second section of metal sheath 2 and a third section of metal sheath 3 which are connected in sequence;
the second cable metallic sheath loop comprises: a fourth section of metal sheath 4, a fifth section of metal sheath 5 and a sixth section of metal sheath 6 which are connected in sequence;
the third cable metallic sheath circuit comprises: a seventh section of metal sheath 7, an eighth section of metal sheath 8 and a ninth section of metal sheath 9 which are connected in sequence;
the fifth section of metal sheath 5 is electrically connected with the first section of metal sheath 1 and the ninth section of metal sheath 9 respectively; the eighth section of metal sheath 8 is electrically connected with the third section of metal sheath 3 and the fourth section of metal sheath 4 respectively; the second section of metal sheath 2 is electrically connected with the sixth section of metal sheath 6 and the seventh section of metal sheath 7 respectively.
In an optional embodiment of the present invention, the third section of metal sheath 3 is grounded through the first circular current suppressor;
the sixth section of metal sheath 6 is grounded through a second circular current suppressor; the ninth section of metal jacket 9 is grounded through a third circulating current suppressor.
In this embodiment, the first circulation suppressor, the second circulation suppressor, and the third circulation suppressor are identical in structure, and the terms "first", "second", and "third" are used only for convenience of distinction. The third section of metal sheath 3 of the first cable metal sheath loop A is grounded through the first circulating current suppressor; the sixth section of metal sheath 6 of the second cable metal sheath loop B is grounded through the second circulation suppressor; the ninth section of metal sheath 9 of the third cable metal sheath loop C is grounded through the third circulating current suppressor; when one phase of the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C has a short-circuit fault or the current of a wire core is increased, the voltage at two ends of the inductor is increased, and when the voltage exceeds the voltage borne by the protector, the corresponding circulating current suppressor can timely lead the instantaneously generated high voltage to the grounding end, and clamp the voltage at two ends of the inductor in time, so that the phenomena of operator injury and inductor heating damage are avoided.
In an alternative embodiment of the present invention, the first metal sheath segment 1, the fourth metal sheath segment 4 and the seventh metal sheath segment 7 are grounded.
In an alternative embodiment of the present invention, the first circulation suppressor comprises: the first inductor is electrically connected with the first zinc oxide valve plate; the second circulation suppressor includes: the second inductor is electrically connected with the second zinc oxide valve plate; the third circulation suppressor comprises: the third zinc oxide valve plate and a third inductor electrically connected with the third zinc oxide valve plate.
In this embodiment, the first, second, and third loop flow inhibitors may each comprise two sections: the first part is a zinc oxide valve plate 10 with a protection function, the second part is an inductor 11 for inhibiting circular current, and the implementation process is to seal the zinc oxide valve plate 10 and the inductor 11 by using an epoxy pouring mode to obtain a sealing device; optionally, the outside of the sealing device is sealed again by a silicone rubber sleeve to achieve the waterproof and moistureproof effects.
In an alternative embodiment of the present invention, as shown in fig. 2, the circulation current on the first cable metal sheath loop a, the second cable metal sheath loop B and the third cable metal sheath loop C is obtained by the following steps:
step 21, acquiring induced voltage and mutual inductance combinations of the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C according to parameters of the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C;
and step 23, obtaining the circulating currents on the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C according to the coefficient matrix.
In this embodiment, obtaining the relevant parameters of the metal sheath may include: obtaining the radius, the length and the unit impedance of each section of the metal sheath, and the grounding resistance and the frequency of two ends of the metal sheath loop; calculating the induced voltage U and mutual inductance combination X of each phase of sheath according to the parameters in the step 21a1-XanForming matrix, calculating coefficient matrix D, and calculating voltage U and D according to formula DsU is obtained to obtain the circulation I of each phase of sheathsThe value is obtained.
Preferably, the induced potentials of the first cable metal sheath loop a, the second cable metal sheath loop B and the third cable metal sheath loop C have the following relations:
ESA1＝-(XAAIA+XABIB+XACIC)×L1；
ESA2＝-(XAAIA+XABIB+XACIC)×L2；
ESA3＝-(XAAIA+XABIB+XACIC)×L3；
ESB4＝-(XBBIB+XABIA+XBCIC)×L4；
ESB5＝-(XBBIB+XABIA+XBCIC)×L5；
ESB6＝-(XBBIB+XABIA+XBCIC)×L6；
ESC7＝-(XCCIC+XACIA+XBCIB)×L7；
ESC8＝-(XCCIC+XACIA+XBCIB)×L8；
ESC9＝-(XCCIC+XACIA+XBCIB)×L9；
wherein, XAA、XBB、XCCAre respectively mutual inductance, X, between the cable core of unit length and the sheath of the phase cableAB、XAC、XBCThe mutual inductance between a cable core of a certain phase of the cable and the small section of the other phase of the sheath layer in unit length is respectively; l is1、L2、L3、L4、L5、L6、L7、L8、L9The lengths of the small sections of cables are interconnected respectively; i isA、IB、ICThree-phase balanced sinusoidal alternating currents flow through the three-phase wire cores respectively;
the induced voltage of the first cable metal sheath loop a is: u shapeA＝ESA1-ESA3；
Induced voltage of the second cable metal sheath loop B: u shapeB＝ESB6-ESB4；
Induced voltage of the third cable metal sheath loop C: u shapeC＝ESC9-ESC7。
In an alternative embodiment of the present invention, as shown in fig. 3, the cable metal sheath circulating current suppressing apparatus further includes: and the first cable metal sheath loop A, the second cable metal sheath loop B and the third cable metal sheath loop C are respectively provided with a return line which is grounded.
In this embodiment, a first return line is laid in parallel beside the first cable metal sheath loop a; laying a second return line beside the second cable metal sheath loop B in parallel; laying a third return line beside the third cable metal sheath loop C in parallel; the two ends of the first return wire, the second return wire and the third return wire are grounded as much as possible, and when a single-phase ground fault occurs in a line, a ground fault current flows through the return wires, so that a shunting effect is achieved, and the loop voltage is reduced.
In this embodiment, the resistance on the return line satisfies:
(IF-IP)×R1-Ip×Zpp+IF×ZPA＝Ip×R2；
wherein, IPIs the current through the return line; zPPA self-inductance impedance which is a return line and takes the ground as a loop; zPAThe lead and the return wire of the first cable metal sheath loop A respectively use the ground as the mutual inductance impedance of the loop, R1To ground resistance, R2Is the ground resistance of the return line;
ZPA＝[rg+j2ω×10-4×k(De/SAp)]×L
ZPP＝{rp+[rg+j2ω×10-4×Ln(De/GMRp)]}×L
wherein r ispIs the resistance of the return line, GMRpThe geometric mean radius of the return line, L is the cable sheath length, De is the cable sheath outer layer diameter, rgIs a ground resistor, SAPThe parallel spacing of the phase cables is grounded for the return lines.
For causing a current I to flow through the return linePMore importantly, even if the fault current flows through the return line as much as possible, the ground resistance R of the return line should be made as large as possible2Smaller, or let Z beApGreater than that, and let Z bePPSmaller. It can be seen that S must therefore be reducedApThe return line is made as close as possible to the cable line; to reduce ZPPIs required to reduce rpWhile increasing GMRpI.e. the resistance of the return wire is small and its radius is large, preferably a diameter-expanded wire.
Optionally, the voltage on the return line is obtained by the following formula:
EA＝(IF-IP)×R1+IF×ZSA-IP×ZPA
EB＝(IF-IP)×R1+IF×ZSB-IP×ZPB
EC＝2(IF-IP)×R1+IF×ZSC-IP×ZPC
wherein E isAFor the first cable to be metal-sheathedVoltage of circuit A, EBFor the second cable metal sheath loop B voltage, ECIs the third cable metal sheath loop C voltage; zSAThe conductor of the first cable metal sheath loop A and the fault phase conductor respectively use the ground as the mutual inductance impedance of the loop, ZSBThe lead of the second cable metal sheath loop B and the fault phase lead respectively use the ground as mutual inductance impedance of the loop; zSCThe lead of the third cable metal sheath loop C and the fault phase lead respectively use the ground as mutual inductance impedance of the loop; zPBThe lead and the return line of the second cable metal sheath loop B respectively use the ground as mutual inductance impedance of the loop; zPCAnd the lead and the return wire of the third cable metal sheath loop C respectively use the ground as mutual inductance impedance of the loop.
When a return line is laid in an actual field, the induced voltage is caused on the return line due to the difference in induced voltage among three phases, and unnecessary loss is caused on the return line due to grounding of both ends. To reduce this loss, the return wires are often laid within the spacing of the three-phase cables, as shown in fig. 4, to avoid circulating current losses during normal operation of the three-phase cables.
Preferably, when the actual influence factor is relatively large, the return line is laid as close as possible to the cable laying when the arrangement shown in fig. 4 cannot be met, as shown in fig. 5 and 6, when the three-phase calandria type laying is performed, the return line is laid at the middle position of the two phases, so that the minimum loss is generated on the return line when the cable runs.
The embodiment of the invention also provides a cable metal sheath circulating current restraining method, which comprises the following steps: obtaining the circulation current on a first cable metal sheath loop A, a second cable metal sheath loop B and a third cable metal sheath loop C; the circulating current is suppressed by a circulating current suppressor electrically connected to the first cable metal sheath circuit a, the second cable metal sheath circuit B, and the third cable metal sheath circuit C, respectively.
In the embodiment, the method is a method corresponding to the device, all implementation manners in the embodiment of the device are applicable to the embodiment of the method, when a single-phase short circuit fault occurs in a circuit, a high voltage generated by a metal sheath of the cable is connected to the ground through the circulating current suppressor, circulating current is further suppressed, and the circuit is protected.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A cable metal sheath circulating current suppressing apparatus, comprising: the cable comprises a first cable metal sheath loop, a second cable metal sheath loop and a third cable metal sheath loop; wherein,
the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop comprise three sections of metal sheaths;
three sections of metal sheaths of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are crossed and interconnected;
the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are respectively grounded through a circulation suppressor, and the circulation suppressor is used for suppressing circulation on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop.
2. The cable metal sheath circulating current suppressing device according to claim 1,
the first cable metal sheath loop comprises a first section of metal sheath, a second section of metal sheath and a third section of metal sheath which are sequentially connected;
the second cable metal sheath loop comprises a fourth section of metal sheath, a fifth section of metal sheath and a sixth section of metal sheath which are sequentially connected;
the third cable metal sheath loop comprises a seventh section of metal sheath, an eighth section of metal sheath and a ninth section of metal sheath which are sequentially connected;
the first section of metal sheath is also electrically connected with the fifth section of metal sheath;
the second section of metal sheath is also electrically connected with the sixth section of metal sheath;
the fourth section of metal sheath is also electrically connected with the eighth section of metal sheath;
the fifth section of metal sheath is also electrically connected with the ninth section of metal sheath;
the sixth section of metal sheath is also electrically connected with the second section of metal sheath;
the seventh section of metal sheath is also electrically connected with the third section of metal sheath.
3. The cable metal sheath circulating current suppressing apparatus as recited in claim 2,
the third section of metal sheath is grounded through the first circulating current suppressor;
the sixth section of metal sheath is grounded through a second circulation suppressor;
the ninth section of metal sheath is grounded through a third circulation suppressor.
4. The cable metal sheath circulating current suppressing apparatus as recited in claim 3,
the first circulation suppressor includes: the first inductor is electrically connected with the first zinc oxide valve plate;
the second circulation suppressor includes: the second inductor is electrically connected with the second zinc oxide valve plate;
the third circulation suppressor comprises: the third zinc oxide valve plate and a third inductor electrically connected with the third zinc oxide valve plate.
5. The cable metal sheath circulation suppressing device according to claim 2, wherein the first length of metal sheath, the fourth length of metal sheath, and the seventh length of metal sheath are grounded.
6. The cable metal sheath circulation restraining device according to any one of claims 1 to 5, wherein circulation on the first cable metal sheath circuit, the second cable metal sheath circuit, and the third cable metal sheath circuit is obtained by:
acquiring induced voltage and mutual inductance combinations of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop according to parameters of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop;
obtaining a coefficient matrix according to the combination of the induced voltages and mutual inductance of the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop;
and obtaining the circulating currents on the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop according to the coefficient matrix.
7. The cable metal sheath circulation suppressing device according to any one of claims 1 to 5, further comprising:
and the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop are respectively provided with a return line which is grounded.
8. The cable metal sheath circulating current suppressing device according to claim 7, wherein the resistance on the return line satisfies:
(IF-IP)×R1-Ip×Zpp+IF×ZPA＝Ip×R2；
wherein, IPFor current through the return line, IF for ground short-circuit current, ZPPA self-inductance impedance which is a return line and takes the ground as a loop; zPAThe lead and the return line of the first cable metal sheath loop respectively use the ground as the mutual inductance impedance of the loop, R2To ground for return linesR is1Is a ground resistor.
9. The cable metal sheath circulating current suppressing device according to claim 7, wherein the voltage on the return line is obtained by the following equation:
EA＝(IF-IP)×R1+IF×ZSA-Ip×ZPA；
EB＝(IF-Ip)×Rl+IF×ZSB-IP×ZPB；
EC＝2(IF-IP)×R1+IF×ZSC-IP×ZPC；
wherein EA is the first cable metal sheath loop voltage;
EBis the second cable metal sheath loop voltage;
ECis the third cable metal sheath loop voltage;
ZSAthe lead of the first cable metal sheath loop and the fault phase lead respectively use the ground as mutual inductance impedance of the loop;
ZSBthe lead of the second cable metal sheath loop and the fault phase lead respectively use the ground as mutual inductance impedance of the loop;
ZSCthe lead of the third cable metal sheath loop and the fault phase lead respectively use the ground as mutual inductance impedance of the loop;
ZPBthe lead and the return line of the second cable metal sheath loop respectively use the ground as mutual inductance impedance of the loop;
ZPCand the lead and the return wire of the third cable metal sheath loop respectively use the ground as mutual inductance impedance of the loop.
10. A cable metal sheath circulating current restraining method, comprising:
obtaining the circulation current on a first cable metal sheath loop, a second cable metal sheath loop and a third cable metal sheath loop;
and the circulating current is restrained by a circulating current suppressor which is respectively and electrically connected with the first cable metal sheath loop, the second cable metal sheath loop and the third cable metal sheath loop.
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| CN113949062A (en) * | 2021-10-10 | 2022-01-18 | 国网黑龙江省电力有限公司伊春供电公司 | Method for solving problem of sudden circulation change of multi-loop high-voltage single-core power cable sheath |
Citations (13)
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