CN109888780B - Active adjustment-based large-length high-voltage cable protection method - Google Patents
Active adjustment-based large-length high-voltage cable protection method Download PDFInfo
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Abstract
The invention discloses a major-length high-voltage cable protection method based on active adjustment. The invention is based on a sensor monitoring and operating system and a lightning stroke early warning system, completes the analysis of the operation state and the weight of the cable, actively adjusts the cable protection mode according to the real-time analysis, improves the protection accuracy and efficiency, and reduces the operation cost of the whole cable. And economic loss is reduced.
Description
Technical Field
The invention relates to a protection method for a large-length laid high-voltage transmission cable.
Background
Along with the development of high tension cable, long distance segmentation cable becomes the direction of high tension cable development, through increasing the cable segmentation distance, can reduce the joint quantity of cable, and effectual reduction trouble probability and proportion improve high tension cable's operating stability. Due to the increase of the distance of the long-distance segmented cable, the induced electromotive force of the metal sheath of the single-segment cable is greatly improved, and the transmission and grounding parameters of the sheath are changed, so that the parameter changes of the cable in unbalanced operation, short-circuit fault and lightning stroke states are caused, the circulation current of the sheath of the cable and the lightning stroke current are caused, and the fault and danger are caused.
The existing protection methods are passive protection, so that the operation structural parameters and the sheath structural parameters of the high-voltage cable in the above states are improved, the set parameters of the sheath protector and the like are improved, and the tolerance of the cable and the sheath is improved, so that the cable can directly bear the above states. Therefore, the manufacturing cost of the cable is increased, and the sudden state is not generated for a long time and is not generated for a long time, so that the high cost and the low efficiency of the passive protection are caused. Therefore, it is necessary to combine the intelligent operation trend of the high-voltage line and the operation state of the cable to perform an active protection design. The invention is based on a sensor monitoring and operating system and a lightning stroke early warning system, completes the analysis of the operation state and the weight of the cable, actively adjusts the cable protection mode according to the real-time analysis, improves the protection accuracy and efficiency, and reduces the operation cost of the whole cable. And economic loss is reduced.
Disclosure of Invention
The technical problem is as follows: the invention provides a large-length high-voltage cable protection method based on active adjustment, which can improve protection accuracy and efficiency, can effectively protect and can reduce cable cost.
The technical scheme is as follows: the invention discloses a large-length high-voltage cable protection method based on active adjustment, which comprises the following specific steps:
step 1: judging the state of the cable through a sensor monitoring and operating system and a lightning stroke early warning system;
step 2: judging whether the working state of the large and long-section high-voltage cable is normal or not, if so, normally operating the power transmission system without protective action, otherwise, further judging whether the line is in three-phase unbalanced operation or short-circuit fault, and judging lightning stroke by the lightning stroke early warning system; if the three-phase imbalance state is judged, entering a step 3, if the short-circuit failure state is judged, entering a step 4, if the lightning stroke early warning exists, entering a step 5, and if the multiple superposition running states exist, entering a step 6;
and step 3: the three-phase unbalanced operation protection system operates to control the corresponding reactance access equipment and the controllable grounding device;
and 4, step 4: the short-circuit fault operation protection system operates to control the corresponding reactance access equipment and the controllable grounding device;
and 5: the lightning stroke protection system operates to control the corresponding reactance access equipment and the controllable grounding device;
step 6: and the comprehensive protection system operates to control the corresponding reactance access equipment and the controllable grounding device.
Furthermore, in the method of the present invention, the sensor monitoring and operation determining system includes a cable three-phase current monitoring sensor, a cable sheath voltage monitoring sensor, and a cable sheath circulating current monitoring sensor, the system is used for setting thresholds of three-phase current, cable sheath voltage, cable sheath circulating current, and three-phase current unbalance degree when the high voltage cable operates, and comparing the thresholds with a real-time operation value monitored by the sensor, and the system also sets a cable operation state distribution area w 1 ，w 2 ，w 3 ，w 4 Severity parameter ε n (n is 1,2,3,4), time parameter weight η t n (n＝1,2,3,4)。
Further, in the method of the present invention, the operation method of the three-phase unbalanced operation protection system in step 3 is that the unbalanced phase and the unbalanced degree are determined according to the sensor groupCoefficient epsilon 1 . Establishing an imbalance function F 1 (ε 1 ,ηt 1 ) Establishing a controllable unbalanced reactance function X of the metal sheath 1 (F 1 ，ε 1 ) And a ground function G 1 And according to the results of the unbalanced reactance function X1 and the grounding function G1, the remote end controls the corresponding reactance access equipment and the controllable grounding device to realize the suppression of the circular current in the unbalanced state.
Furthermore, in the method of the present invention, the operation method of the short-circuit fault operation protection system in the step 4 is that the short-circuit degree coefficient epsilon of the short-circuit phase is determined according to the sensor group 2 Establishing a short-circuit function F 2 (ε 2 ,ηt 2 ) Establishing a controllable unbalanced reactance function X of the metal sheath 2 (F 2 ，ε 2 ) And cross interconnection grounding is adopted, and corresponding reactance access equipment and a controllable grounding device are remotely controlled according to an unbalanced reactance function, so that short circuit backflow and sheath circulating current suppression are realized.
Further, in the method of the present invention, the operation method of the lightning stroke protection system in the step 5 is that the possibility of lightning stroke is judged according to the lightning stroke early warning system, if yes, the protection method under lightning stroke early warning is started, and the coefficient epsilon of the possible degree of lightning stroke occurrence is determined according to the lightning stroke early warning system 3 Establishing lightning stroke judgment F 3 ＝f(ε 3 ,ηt 3 ) Establishing a lightning grounding function G 2 And the sheath protector protection function is as follows:
P(U1....Un，I1....In，) 1 ＝f p (F 3 ,ε 3 ,ηt 3 )
the protection function is stored by adopting a database so as to correspond to the current and voltage design values of the protection layer protectors which are not used, the parameter values required by the protection layer protectors are obtained according to the protection function, and a plurality of groups of protection layer protector matrixes are grouped and combined to realize the accurate protection of lightning stroke.
Further, in the method of the present invention, the operation method of the integrated protection system in step 6 is that according to the imbalance function F 1 ＝f(ε 1 ,ηt 1 ) Short circuit function F 2 ＝f(ε 2 ,ηt 2 ) Mine, thunderClick function F 3 ＝f(ε 3 ,ηt 3 ) The complex fault function F is delta 1 F 1 +δ 2 F 2 +δ 3 F 3 Obtaining a distribution area w corresponding to the running state of the cable 1 ，w 2 ，w 3 ，w 4 Corresponding to the regional group protection methods, P1, P2, P3, P4. Establishing an unbalanced reactance function X 4 (P 1 ，P 2 ，P 3 ，P 4 ) And ground function G 4 (P 1 ，P 2 ，P 3 ，P 4 ) And the remote end controls the corresponding reactance access equipment and the controllable grounding device according to the function value.
According to the active adjustment-based large-length high-voltage cable protection method, the sensor monitoring and operation judging system comprises a cable three-phase current monitoring sensor, a cable sheath voltage monitoring sensor and a cable sheath circulating current monitoring sensor. And setting three-phase current, cable sheath voltage, cable sheath circulating current and three-phase current unbalance threshold values when the high-voltage cable runs, and comparing the three-phase current, the cable sheath circulating current and the three-phase current unbalance threshold values with real-time running values. Setting a cable running state distribution area w 1 ，w 2 ，w 3 ，w 4 And a severity parameter ε n (n is 0,1,2,3 respectively corresponding to different operating states, normal, unbalanced, short-circuit and lightning stroke), and the time parameter weight etat n (n is 0,1,2,3 respectively corresponding to different operation states), and is a time weight of all operation states occurring in the unit time.
Furthermore, in the method of the invention, the three-phase unbalanced state operation protection method determines the unbalanced phase and the unbalanced degree coefficient epsilon according to the sensor group,
Δ I is the unbalance offset, I p Three-phase average load current. Establishing an imbalance function F 1 ＝f(ε 1 ,ηt 1 ) Establishing a controllable unbalanced reactance function X of the metal sheath 1 ＝k 11 F 1 +k 12 ε 1 And the grounding function is as follows:
the return value of the ground function is G1 ═ 0,1,2 correspond to single-ended ground, double-ended ground, cross-connect ground, and s1, s2 are set thresholds, respectively. And according to the results of the unbalanced reactance function X and the grounding function G, remotely controlling the corresponding reactance access equipment and the controllable grounding device to realize the circulating current suppression in the unbalanced state.
The invention discloses a method for protecting a long-section high-voltage cable based on active adjustment, which is a short-circuit fault operation protection method and is characterized in that a short-circuit phase short-circuit degree coefficient epsilon is determined according to a sensor group 2 ，
I S For short-circuit current, I N Is the rated current. Establishing a short-circuit function F 2 ＝f(ε 2 ,ηt 2 ) Establishing a controllable unbalanced reactance function X of the metal sheath 2 ＝k 21 F 2 +k 22 ε 2 And grounded by cross-bar interconnection. And according to the unbalanced reactance function, the remote end controls corresponding reactance access equipment and a controllable grounding device to realize short circuit backflow and sheath circulation suppression.
The invention relates to a major-length high-voltage cable protection method based on active adjustment, a protection method under lightning stroke early warning, which judges the possibility of lightning stroke according to a lightning stroke early warning system, if so, the protection method under lightning stroke early warning is started, and a lightning stroke emission possibility degree coefficient epsilon is determined according to the lightning stroke early warning system 3 Establishing lightning stroke judgment F 3 ＝f(ε 3 ,ηt 3 ) Establishing a lightning grounding function
And sheath protector protection function
P(U1....Un，I1....In，) 1 ＝f p (F 3 ,ε 3 ,ηt 3 )
The protection function adopts a database storage mode to correspond to the current and voltage design values of the unused protective layer protector. And obtaining the parameter value required by the protective layer protector according to the protection function. And grouping the multiple groups of protective layer protector matrixes, and combining to realize accurate protection on lightning stroke.
According to the active adjustment-based large-length high-voltage cable protection method, when various overlapping occurs, such as unbalanced operation and lightning stroke, or short circuit and lightning stroke, a comprehensive protection method is adopted. The comprehensive protection method is based on an unbalance function F 1 ＝f(ε 1 ,ηt 1 ) Short circuit function F 2 ＝f(ε 2 ,ηt 2 ) And lightning strike function F 3 ＝f(ε 3 ,ηt 3 ) Establishing a synthetic fault function
F＝δ 1 F 1 +δ 2 F 2 +δ 3 F 3
δ 1 ，δ 2 ，δ 3 In order to set the fault weight coefficient, the distribution area w of the running state of the corresponding cable is determined according to the comprehensive fault coefficient value 1 ，w 2 ，w 3 ，w 4 . Combined protection method for regions, P1, P2, P3, P4. Establishing an unbalanced reactance function X 4 (P 1 ，P 2 ，P 3 ，P 4 ) And a ground function G 4 (P 1 ，P 2 ，P 3 ，P 4 ) And the remote end controls the corresponding reactance access equipment and the controllable grounding device according to the function value.
The reactor access equipment adjusts the combined reactor to realize sheath circulation suppression according to the reactor control signal. And the protection parameters of the protective layer are adjusted through the protective layer protector array, so that lightning stroke protection is realized. The adjustment of different grounding modes is realized through the grounding control switch.
In the method, the reactance access equipment adjusts the combined reactor to realize the sheath circulating current inhibition according to the reactor control signal. And the protection parameters of the protective layer are adjusted through the protective layer protector array, so that lightning stroke protection is realized. The adjustment of different grounding modes is realized through the grounding control switch.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the invention relates to a protection method for a long-section laid high-voltage transmission cable, which comprises a comprehensive protection method based on an active adjustment grounding mode, an active adjustment sheath protection reactor and an active adjustment sheath protector. And judging the running state of the cable by adopting a sensor monitoring and running system and a lightning stroke early warning system, and calling different running protection methods respectively according to the judgment result to carry out accurate running protection. According to the protection method, the sheath circulating current, the return current, the sheath induction voltage and the sheath breakdown voltage can be accurately protected according to the behavior state and aiming at the influence under different states, the protection accuracy and efficiency are improved by the change fixed mode and the structural form of passive protection, and the effective protection can be realized while the cable cost can be reduced.
Drawings
FIG. 1 is an overall block diagram of the method for protecting a long-section high-voltage cable based on active adjustment according to the invention
FIG. 2 is a block diagram of a cable protection system
FIG. 3 is an array of sheath protectors
In the figure: 1. the cable comprises a cable metal sheath, 2 cable cores, 3 combined reactors, 4 reactor control signals, 5 main shafts, 6 protective layer protection and grounding devices, 7 grounding control switches, 8 protective layer protector arrays, 9 protective layer protector and grounding connections, 10 single protective layer protectors, 11 protective layer protector transverse connection switches, 12 protective layer protector longitudinal connection switches and 13 grounding connection switches.
Detailed Description
Step 1: cable state is judged through sensor monitoring and operation system and lightning stroke early warning system
And 2, step: and judging whether the working state of the large-length high-voltage cable is normal or not, if so, normally operating the power transmission system, if not, further judging whether the line is in three-phase unbalanced operation or short-circuit fault occurs, and judging lightning stroke by the lightning stroke early warning system.
And 3, step 3: if the three-phase imbalance state is judged, the three-phase imbalance operation protection system operates
And 4, step 4: if the short-circuit fault state is judged, the short-circuit fault operation protection system operates
And 5: and if the lightning stroke early warning is judged to exist, the lightning stroke protection system operates.
In the method, the sensor monitoring and operation judging system comprises a cable three-phase current monitoring sensor, a cable sheath voltage monitoring sensor and a cable sheath circulating current monitoring sensor. And setting three-phase current, cable sheath voltage, cable sheath circulating current and three-phase current unbalance threshold values when the high-voltage cable runs, and comparing the three-phase current, the cable sheath circulating current and the three-phase current unbalance threshold values with real-time running values. Setting a cable running state distribution area w 1 ，w 2 ，w 3 ，w 4 And a severity parameter ε n (n is 0,1,2,3 correspond to different operating states, normal, unbalanced, short-circuit and lightning stroke, respectively), and the time parameter weight η t n (n is 0,1,2,3 respectively corresponding to different operation states) is a time weight of all operation states occurring in a unit time.
In one embodiment of the method of the invention, the three-phase unbalanced state operation protection method determines an unbalanced phase and an unbalanced degree coefficient epsilon according to a sensor group,
Δ I is the unbalance offset, I p Three-phase average load current. Establishing an imbalance function F 1 ＝f(ε 1 ,ηt 1 ) Establishing a controllable unbalanced reactance function X of the metal sheath 1 ＝k 11 F 1 +k 12 ε 1 And function of ground
The return value of the ground function is G1 ═ 0,1,2 correspond to single-ended ground, double-ended ground, cross-connect ground, and s1, s2 are set thresholds, respectively. And according to the results of the unbalanced reactance function X and the grounding function G, remotely controlling the corresponding reactance access equipment and the controllable grounding device to realize the circulating current suppression in the unbalanced state.
The invention discloses a methodIn one embodiment of the method, the short-circuit fault operation protection method determines the short-circuit degree coefficient epsilon of the short-circuit phase according to the sensor group 2 ，
I S For short-circuit current, I N Is the rated current. Establishing a short-circuit function F 2 ＝f(ε 2 ,ηt 2 ) Establishing a controllable unbalanced reactance function X of the metal sheath 2 ＝k 21 F 2 +k 22 ε 2 And is grounded by cross-connection. And according to the unbalanced reactance function, the remote end controls corresponding reactance access equipment and a controllable grounding device to realize short circuit backflow and sheath circulation suppression.
In one embodiment of the method, the lightning stroke early warning protection method judges the possibility of lightning stroke according to a lightning stroke early warning system, if so, the lightning stroke early warning protection method is started, and the lightning stroke emission possibility degree coefficient epsilon is determined according to the lightning stroke early warning system 3 Establishing lightning stroke judgment F 3 ＝f(ε 3 ,ηt 3 ) Establishing a lightning grounding function and a protective function of the sheath protector respectively as follows:
P(U1....Un，I1....In，) 1 ＝f p (F 3 ,ε 3 ,ηt 3 )
the protection function adopts a database storage mode to correspond to the current and voltage design values of the unused protective layer protector. And obtaining the parameter value required by the protective layer protector according to the protection function. And grouping the multiple groups of protective layer protector matrixes, and combining to realize accurate protection of lightning stroke.
In one embodiment of the method of the present invention, multiple protection methods are used in a stack. When multiple overlapping occurs, such as unbalanced operation and lightning stroke, or short circuit and lightning stroke, a comprehensive protection method is adopted. The comprehensive protection method is based on the imbalance function F 1 ＝f(ε 1 ,ηt 1 ) Short circuit ofFunction F 2 ＝f(ε 2 ,ηt 2 ) And lightning strike function F 3 ＝f(ε 3 ,ηt 3 ) Establishing a synthetic fault function
F＝δ 1 F 1 +δ 2 F 2 +δ 3 F 3
δ 1 ，δ 2 ，δ 3 In order to set the fault weight coefficient, the distribution area w of the running state of the corresponding cable is determined according to the comprehensive fault coefficient value 1 ，w 2 ，w 3 ，w 4 . Combined protection method for regions, P1, P2, P3, P4. Different protection methods set different reactance functions and grounding functions.
The reactor access equipment adjusts the combined reactor to realize sheath circulation suppression according to the reactor control signal. And the protection parameters of the protective layer are adjusted through the protective layer protector array, so that lightning stroke protection is realized. The adjustment of different grounding modes is realized through the grounding control switch.
Claims (3)
1. A large-length high-voltage cable protection method based on active adjustment is characterized by comprising the following steps:
step 1: judging the state of the cable through a sensor monitoring and operating system and a lightning stroke early warning system;
step 2: judging whether the working state of the large and long-section high-voltage cable is normal or not, if so, normally operating the power transmission system without protective action, otherwise, further judging whether the line is in three-phase unbalanced operation or short-circuit fault, and judging lightning stroke by the lightning stroke early warning system; if the three-phase imbalance state is judged, entering a step 3, if the short-circuit failure state is judged, entering a step 4, if the lightning stroke early warning exists, entering a step 5, and if the multiple superposition running states exist, entering a step 6;
and step 3: the three-phase unbalanced operation protection system operates to control the corresponding reactance access equipment and the controllable grounding device; the operation method of the three-phase unbalanced operation protection system comprises the steps of determining an unbalanced phase and an unbalanced degree coefficient epsilon according to a sensor group 1 Establishing an imbalance function F 1 (ε 1 ,ηt 1 ) Establishing a controllable unbalanced reactance function X of the metal sheath 1 (F 1 ，ε 1 ) And a ground function G 1 According to the results of the unbalanced reactance function X1 and the grounding function G1, the corresponding reactance access equipment and the controllable grounding device are remotely controlled, and the circulating current suppression in the unbalanced state is realized;
and 4, step 4: the short-circuit fault operation protection system operates to control the corresponding reactance access equipment and the controllable grounding device; the operation method of the short-circuit fault operation protection system comprises the following steps of determining a short-circuit degree coefficient epsilon of a short-circuit phase according to a sensor group 2 Establishing a short-circuit function F 2 (ε 2 ,ηt 2 ) Establishing a controllable unbalanced reactance function X of the metal sheath 2 (F 2 ，ε 2 ) Cross interconnection grounding is adopted, and corresponding reactance access equipment and a controllable grounding device are remotely controlled according to an unbalanced reactance function, so that short circuit backflow and sheath circulating current suppression are realized;
and 5: the lightning stroke protection system operates to control the corresponding reactance access equipment and the controllable grounding device; the operation method of the lightning stroke protection system comprises the steps of judging the possibility of lightning stroke according to the lightning stroke early warning system, if so, starting the protection method under the lightning stroke early warning, and determining the coefficient epsilon of the possible degree of the lightning stroke according to the lightning stroke early warning system 3 Establishing lightning stroke judgment F 3 ＝f(ε 3 ,ηt 3 ) Establishing a lightning grounding function G 2 And the sheath protector protection function is as follows:
P(U1....Un，I1....In，) 1 ＝f p (F 3 ,ε 3 ,ηt 3 )
the protection function is stored by a database to correspond to the current and voltage design values of the unused protective layer protectors, the parameter values required by the protective layer protectors are obtained according to the protection function, and a plurality of groups of protective layer protector matrixes are grouped and combined to realize accurate protection of lightning stroke;
step 6: and the comprehensive protection system operates to control the corresponding reactance access equipment and the controllable grounding device.
2. The method for protecting a long-section high-voltage cable based on active adjustment according to claim 1, wherein the sensor monitoring and operation judging system comprises a cable three-phase current monitoring sensor, a cable sheath voltage monitoring sensor and a cable sheath circulating current monitoring sensor, the system is used for setting thresholds of three-phase current, cable sheath voltage, cable sheath circulating current and three-phase current unbalance degree during the operation of the high-voltage cable and comparing the thresholds with a real-time operation value monitored by the sensor, and the system also sets a cable operation state distribution area w 1 ，w 2 ，w 3 ，w 4 Severity parameter ε n N is 1,2,3,4, time parameter weight η t n ，n＝1,2,3,4。
3. The method for protecting a long-section high-voltage cable based on active regulation according to claim 1, wherein the operation method of the integrated protection system in the step 6 is that the integrated protection system is operated according to an imbalance function F 1 ＝f(ε 1 ,ηt 1 ) Short circuit function F 2 ＝f(ε 2 ,ηt 2 ) Lightning strike function F 3 ＝f(ε 3 ,ηt 3 ) The complex fault function F is delta 1 F 1 +δ 2 F 2 +δ 3 F 3 Obtaining a distribution area w corresponding to the running state of the cable 1 ，w 2 ，w 3 ，w 4 Establishing an unbalanced reactance function X corresponding to the combined protection method of the regions, P1, P2, P3 and P4 4 (P 1 ，P 2 ，P 3 ，P 4 ) And a ground function G 4 (P 1 ，P 2 ，P 3 ，P 4 ) And controlling the corresponding reactance access equipment and the controllable grounding device according to the remote end of the function value.
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