CN110988508A - Secondary phase checking instrument and phase checking method for guiding cable terminal lap joint - Google Patents
Secondary phase checking instrument and phase checking method for guiding cable terminal lap joint Download PDFInfo
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- CN110988508A CN110988508A CN202010012107.3A CN202010012107A CN110988508A CN 110988508 A CN110988508 A CN 110988508A CN 202010012107 A CN202010012107 A CN 202010012107A CN 110988508 A CN110988508 A CN 110988508A
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Abstract
The invention discloses a secondary phase checking instrument for guiding the lapping of a cable terminal, and relates to the field of dual-power engineering and secondary phase checking of a power system, wherein the phase checking instrument comprises: the invention also discloses a phase checking method of the phase checking instrument. The invention solves the problems that the existing nuclear phase instrument can only rely on manual slow reasoning, consumes time and labor and is easy to make mistakes when finding the phase sequence errors, the secondary nuclear phase instrument for guiding the cable terminal to be lapped is convenient to use, a phase-changing scheme can be automatically obtained through one-time phase checking, the phase sequences of two paths of power supplies can be ensured to be consistent through one-time adjustment, the power transmission time of a dual-power engineering is greatly shortened, the cable terminal is prevented from being distorted and deformed due to multiple times of phase-changing, and the operation reliability of the cable terminal is improved.
Description
Technical Field
The invention relates to the field of dual-power engineering construction and secondary nuclear phase of a power system, in particular to a secondary nuclear phase instrument for guiding the lap joint of a cable terminal, and also relates to a nuclear phase method of the nuclear phase instrument.
Background
With the improvement of the requirement of users on power supply reliability, all cells and important users in a city require to be configured with two power supplies. The newly-built dual-power engineering or the old community dual-power transformation engineering needs to carry out phase checking before operation, and the two power supplies can be operated after the phase sequences of the two power supplies are consistent.
The 10kV power distribution network line has no phase color identification, the method for ensuring the phase sequence consistency of the two power supplies in the current engineering is to disconnect the contact cabinet, send the two power supplies to the incoming line cabinet, and check the phase sequence of the two power supplies through secondary phase checking jacks at the two sides of the contact cabinet. If the phase sequence is wrong, the power supply of the cabinet is disconnected, the lap joint position of the cable terminal of each phase is adjusted according to the phase checking result, and then the power is supplied again to check the phase until the phase sequences of the two paths of power supplies are completely consistent. When the phase sequence of two power supplies is checked by first power transmission, the probability that the phase sequences are completely consistent is only 1/6, and most of the situations need to be powered off again to adjust the lap joint position of each phase cable terminal so that the phase sequences on the two sides are consistent.
Due to the low technical level and poor logical reasoning capability of field constructors, the field constructors can deal with the inconsistent two-phase sequence of the power supply; when the phase sequence of the two power sources A, B, C is inconsistent, the two power sources usually need to think for a long time, and the phase sequence can be changed by a plurality of processes of power failure, maintenance switching, connection switching, power transmission and phase re-checking. For a power distribution room with double power supplies, an incoming line cabinet is usually a GP cabinet, the space of a cable bin is narrow, an incoming line cable terminal is a fully insulated joint, and the lap joint position of each phase cable on a busbar is difficult to adjust after the cable terminal is finished once. The power supply of the incoming line cabinet of the power distribution room is usually led out by an outgoing line cabinet (a central cabinet) of the switching station, the adjustment of the lap joint position of each phase cable on the busbar in the upstream central cabinet is relatively easy, but the logical reasoning process of the phase sequence consistency can be more complicated by how to adjust, and the probability that the adjusted phase sequence still has errors and needs to be adjusted again is higher.
In the field implementation process, each phase sequence adjustment is performed through the processes of power failure, maintenance, change-connection, power transmission and re-phase checking. On one hand, the workload is increased by multiple phase sequence adjustments, and unnecessary time waste is caused; in addition, each adjustment of the cable terminal can cause the distortion and deformation of the cable terminal, and the operation reliability and service life of the cable are seriously affected.
Disclosure of Invention
The invention aims to provide a secondary phase checking instrument for guiding the lapping of a cable terminal, which has the advantages of simple use method, capability of obtaining a switching scheme immediately after the first power transmission phase checking and ensuring the phase sequence of two paths of power supplies to be consistent through one-time adjustment, and capability of solving the problems that the existing phase checking instrument needs constructors to calculate the switching scheme, and the problems of unnecessary time waste, influence on the service life of a cable and the like caused by errors frequently occur.
In order to achieve the purpose, the invention provides the following technical scheme: a secondary nuclear phase instrument for guiding the lap joint of a cable terminal comprises a shell, wherein a processing module is arranged in the shell, a secondary nuclear phase jack is arranged at the top of the shell, and the nuclear phase jack is connected with the processing module;
the processing module comprises a central processing unit, a voltage acquisition module, a phase sequence judgment module and a change-over scheme output module, wherein the voltage acquisition module acquires voltages of different combinations between two power supply three phases input into the nuclear phase jack, the phase sequence judgment module judges whether each phase of the two power supplies is in the same phase or not according to the voltage acquisition condition, a phase sequence judgment matrix is given, and the change-over scheme output module gives a correct wiring scheme according to the phase sequence judgment matrix and gives a corresponding prompt.
The cable splicing system is characterized by further comprising a wiring mode input module, wherein the wiring mode input module is connected with the central processing unit, receives cable splicing position information input by a user, and gives a correct wiring scheme.
The secondary nuclear phase jacks comprise a wiring cabinet secondary nuclear phase jack and a connection cabinet secondary nuclear phase jack, the number of the wiring cabinet secondary nuclear phase jacks and the number of the connection cabinet secondary nuclear phase jacks are respectively three, and the wiring cabinet secondary nuclear phase jack and the connection cabinet secondary nuclear phase jack are respectively connected with the three-phase power supply input ends of the wiring cabinet and the connection cabinet.
The voltage acquisition module comprises a first voltmeter, a second voltmeter, a third voltmeter and an acquisition switch, the acquisition switch is respectively arranged on a connecting line of each secondary nuclear phase jack and the voltage acquisition module, the first voltmeter is connected with a connecting line of the cabinet side secondary nuclear phase jack in parallel, the second voltmeter is connected with a connecting line of the cabinet side secondary nuclear phase jack in parallel, and the third voltmeter is connected in series between the connecting line of the cabinet side secondary nuclear phase jack and the connecting line of the cabinet side secondary nuclear phase jack.
The prompting method is display screen display or voice prompt, the display screen and the loudspeaker are fixedly connected to the shell, the display screen and the loudspeaker are connected with the central processing unit, the phase checking instrument further comprises an operation key, and the operation key is connected with the wiring mode input module to receive cable lap joint position information input by a user.
The invention also discloses a phase checking method using the secondary phase checking instrument, which specifically comprises the following steps:
1) the voltage acquisition module respectively starts one of the connecting wires of the secondary nuclear phase jacks at the outlet side and the connecting wires of the secondary nuclear phase jacks at the inlet side, measures and acquires voltage values through three voltmeters, and inputs the voltage values into the phase sequence judgment module;
2) the phase sequence judging module calculates an included angle between voltages of each phase of the two paths of power supplies through a cosine law according to voltages acquired by the three voltmeters so as to judge whether the two paths of power supplies are in phase or not;
3) repeating the step 1) and the step 2), finishing judging all phases of the two paths of power supplies, finally outputting a phase judgment matrix by the phase sequence judgment module, and inputting the matrix into the switching scheme output module;
4) and the switching scheme output module calculates a wiring scheme according to the phase judgment matrix output by the phase sequence judgment module, outputs the scheme and displays the scheme on a display screen or sends out prompt voice of the corresponding wiring scheme.
The judgment of whether the two power supplies are in phase in the step 2) is realized by the following formula:
wherein, U1Is a sampled value of a first voltmeter, U2Is a sampled value of a second voltmeter, U3Sampling values of a third voltmeter; when in use
While, U1、U2Are in phase;
while, U1、U2Out of phase.
The matrix is a 3-by-3 matrix, 1-3 rows of the matrix respectively represent the phase bus bars of the incoming line cabinet A, B, C, and 1-3 columns of the matrix respectively represent the phase bus bars of the interconnection cabinet A, B, C. If the element of the i row and the j column of the matrix is 1, the voltage in the i-phase busbar of the incoming line cabinet and the voltage in the j-phase busbar of the contact cabinet are in the same phase. If the element of i row and j column of the matrix is 0, it represents that the voltage in the i-phase busbar of the incoming line cabinet is out of phase with the voltage in the j-phase busbar of the connection cabinet.
Compared with the prior art, the invention has the following beneficial effects:
the method can obtain the switching scheme through one-time nuclear phase operation, avoids multiple wiring and phase checking time, manual recording of phase checking result time, thinking analysis of switching scheme time, switching error rework time and the like, greatly saves labor hour and improves production efficiency;
the switching scheme obtained by the invention can ensure that the phase sequences of two paths of power supplies are consistent, can avoid the distortion and deformation of the cable terminal caused by the repeated adjustment of the cable terminal, and greatly improves the reliability and service life of the operation of the cable terminal.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the secondary nuclear phase principle of the present invention;
FIG. 3 is an interface for operation according to the present invention;
FIG. 4 is a schematic diagram of a wire mode input interface according to the present invention;
FIG. 5 is a schematic diagram of an implementation process of the secondary nuclear phase method of the present invention;
FIG. 6 is a schematic diagram of determining phase voltage angle by a three-meter method according to the present invention;
FIG. 7 is a diagram showing the cable overlapping condition when the phase sequence of the incoming line cabinet is [ a, c, b ] and the phase sequence of the outgoing line cabinet is [ a, b, c ];
FIG. 8 is a schematic diagram of a scheme for adjusting the cable overlapping manner in the outlet cabinet to make the phase sequence of the two sides consistent in the overlapping manner of FIG. 7;
FIG. 9 is a schematic view of a scheme for adjusting the cable overlapping manner in the incoming line cabinet to make the phase sequence of the two sides consistent in the overlapping manner of FIG. 7;
FIG. 10 is a diagram showing the cable overlapping when the phase sequence of the incoming line cabinet is [ b, c, a ] and the phase sequence of the outgoing line cabinet is [ a, b, c ];
fig. 11 is a schematic diagram of a scheme for adjusting the cable overlapping manner in the outlet cabinet to make the phase sequence of the two sides consistent in the overlapping manner of fig. 10;
fig. 12 is a schematic diagram of a scheme for adjusting the cable splicing mode in the incoming line cabinet to make the phase sequence of the two sides consistent under the splicing mode in fig. 10.
Legend: 1-secondary nuclear phase jack of the incoming line cabinet; 2-secondary nuclear phase jack of the contact cabinet; 3-a display screen; 4-screen locking/power-on key; 5-operating a key; 6-charger interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, some noun explanations mentioned in the present invention are given.
Wire inlet cabinet: a switch cabinet for introducing power supply from outside.
An outgoing line cabinet: the invention relates to a switch cabinet for distributing electric energy from an upstream bus, wherein a power supply is sent to a downstream incoming cabinet from an upstream appearance cabinet, and an outgoing cabinet is connected with an incoming cabinet through a three-core cable.
A communication cabinet: and the cabinet body is communicated with the other power supply in the dual-power high-voltage cabinet.
Nuclear phase: and (4) checking whether the three-phase voltage between the incoming line cabinet busbar and the contact cabinet busbar is in the same phase or not by taking the three-phase voltage of the busbar in the contact cabinet as a positive phase sequence.
The switching scheme is as follows: when the voltage phase sequence of each phase of the bus bar of the incoming line cabinet is different from that of each phase of the bus bar of the contact cabinet, the lapping position of each phase of cable terminal of the incoming line cabinet on the bus bar is adjusted or the lapping position of each phase of cable of the outgoing line cabinet on the bus bar is adjusted, so that the phase sequence of each phase of voltage in the bus bar of the incoming line cabinet is the same as that of each phase of voltage in the bus bar of the contact cabinet, and the general principle:
the phase sequence of the busbars in the incoming line cabinet, the outgoing line cabinet and the contact cabinet from left to right, from top to bottom or from back to front is respectively represented by A, B, C.
The actual voltage phase sequence in the cable, bus bar is denoted by a, b, c.
And (3) taking the phase sequence of the voltage in the communication cabinet as a reference, assuming that the phase sequence is a positive phase sequence, namely:
contact cabinet =
；
The nuclear phase reconnection work is to ensure that the phase sequence of the incoming line cabinet is consistent with that of the contact cabinet, namely:
inlet cabinet =
Contact cabinet =
。
The invention relates to a secondary phase checking instrument for guiding the lap joint of a cable terminal, which comprises a shell, wherein a processing module is arranged in the shell, a secondary phase checking jack is arranged at the top of the shell and connected with the processing module, a charger interface 6 is arranged at the bottom of the shell and used for supplying power to the phase checking instrument, and a rechargeable battery can be arranged in the phase checking instrument, so that the phase checking instrument can independently operate without external power supply.
Specifically, processing module includes central processing unit, voltage acquisition module, phase sequence determination module, changes and connects scheme output module, voltage acquisition module gather the voltage of the different combinations between the two way power three-phases of input in the nuclear phase jack, phase sequence determination module judge whether the same phase between each looks of two way power according to gathering the voltage condition, give the phase sequence and judge the matrix, change and connect scheme output module and judge the matrix according to the phase sequence and give correct wiring scheme to send corresponding suggestion.
According to the arrangement, the nuclear phase instrument can only provide a scheme for changing the incoming line cabinet. If the user wants to wire the outgoing line cabinet, the nuclear phase instrument cannot work. Therefore, the invention also introduces a wiring mode input module which is connected with the central processing unit and used for receiving the cable overlapping position information manually input by a user and giving a correct wiring scheme aiming at the outgoing line cabinet.
In the invention, the secondary nuclear phase jacks comprise a wiring cabinet secondary nuclear phase jack 1 and a connection cabinet secondary nuclear phase jack 2, the number of the wiring cabinet secondary nuclear phase jacks 1 and the number of the connection cabinet secondary nuclear phase jacks 2 are respectively three, and the wiring cabinet secondary nuclear phase jack 1 and the connection cabinet secondary nuclear phase jack 2 are respectively connected with three-phase power supply input ends of the wiring cabinet and the connection cabinet.
Specifically, the secondary nuclear phase jack 1 of the inlet cabinet has three colors of yellow, green and red, and is respectively connected with the A, B, C phase nuclear phase jack on the panel of the inlet cabinet through three secondary leads of yellow, green and red. The secondary phase checking jack 2 of the contact cabinet is provided with three colors of yellow, green and red and is respectively connected with A, B, C phase checking jacks on the panel of the contact cabinet through three secondary leads of yellow, green and red.
The voltage acquisition module include first voltmeter, second voltmeter, third voltmeter and gather the switch, gather the switch respectively on every secondary nuclear phase jack and voltage acquisition module's connecting wire, first voltmeter is parallelly connected with the connecting wire of advancing cabinet side secondary nuclear phase jack, the second voltmeter is parallelly connected with the connecting wire of going out cabinet side secondary nuclear phase jack, the third voltmeter establishes ties between the connecting wire of going out cabinet side secondary nuclear phase jack and the connecting wire of advancing cabinet side secondary nuclear phase jack.
The prompting method is display screen display or voice prompt, a display screen 3 and a loudspeaker are fixedly connected to a shell, the display screen 3 and the loudspeaker are connected with a central processing unit, the phase checking instrument further comprises an operation key 5, and the operation key 5 is connected with a wiring mode input module to receive cable overlapping position information input by a user or operate a corresponding function menu to realize a corresponding application function of the phase checking instrument.
The invention also relates to a phase checking method of the secondary phase checking instrument for guiding the cable terminal to be lapped, which comprises the following steps:
1) the voltage acquisition module respectively starts one of the connecting wires of the secondary nuclear phase jacks at the outlet side and the connecting wires of the secondary nuclear phase jacks at the inlet side, measures and acquires voltage values through three voltmeters, and inputs the voltage values into the phase sequence judgment module;
the above-mentioned opening and closing of the connecting lines is realized by means of switches arranged on each connecting line, specifically, switches S1-S3 are respectively arranged on the connecting lines of the core phase jacks of the incoming line cabinet, and locks are arranged among switches S4-S6, S1, S2 and S3 respectively arranged on the connecting lines of the secondary core phase jacks of the interconnection cabinet, that is, only one switch of S1, S2 and S3 is in a closed state at the same time. And locking is arranged among the S4, the S5 and the S6, namely only one switch of the S4, the S5 and the S6 is in a closed state at the same time.
At the beginning of step 1), the system respectively closes the switch combinations [ S1, S4], [ S1, S5], [ S1, S6], [ S2, S4], [ S2, S5], [ S2, S6], [ S3, S4], [ S3, S5], [ S3, S6], reads the actual voltage indications of the three voltmeters after the switch combinations are closed, and then sends the readings to the phase sequence judging module.
2) The phase sequence judging module calculates an included angle between voltages of each phase of the two paths of power supplies through a cosine law according to voltages acquired by the three voltmeters so as to judge whether the two paths of power supplies are in phase or not;
specifically, the judgment of whether the two power supplies are in phase or not is realized by the following formula:
U1is a sampled value of a first voltmeter, U2Is a sampled value of a second voltmeter, U3Sampling values of a third voltmeter;
The matrix is a 3-by-3 matrix, 1-3 rows of the matrix respectively represent the phase bus bars of the incoming line cabinet A, B, C, and 1-3 columns of the matrix respectively represent the phase bus bars of the interconnection cabinet A, B, C. If the element of the i row and the j column of the matrix is 1, the voltage in the i-phase busbar of the incoming line cabinet and the voltage in the j-phase busbar of the contact cabinet are in the same phase. If the element of i row and j column of the matrix is 0, it represents that the voltage in the i-phase busbar of the incoming line cabinet is out of phase with the voltage in the j-phase busbar of the connection cabinet.
3) Repeating the step 1) and the step 2), finishing judging all phases of the two paths of power supplies, finally outputting a phase judgment matrix by the phase sequence judgment module, and inputting the matrix into the switching scheme output module;
4) and the switching scheme output module calculates a wiring scheme according to the phase judgment matrix output by the phase sequence judgment module, outputs the scheme and displays the scheme on a display screen or sends out prompt voice of the corresponding wiring scheme.
After the first power transmission phase checking, the following 6 cases may occur as a result of the phase checking. The reasons for the 6 cases and the associated wiring schemes are illustrated below by specific examples:
example 1
When phase decision matrix
I.e. by
Inlet wire =
When the temperature of the water is higher than the set temperature,
the phase sequence of the medium-time incoming line cabinet is consistent with that of the interconnection cabinet, and phase modulation is not needed.
Example 2
When phase decision matrix
I.e. by
Inlet wire =
B, C are opposite in phase sequence.
At this time, the phase sequence of the outgoing line cabinet may be [ a, b, c ], [ a, c, b ], [ b, a, c ], [ b, c, a ], [ c, a, b ], [ c, b, a ] 6.
When the phase sequence of the outgoing line cabinet is [ a, b, c ], the cable termination is lapped as shown in fig. 7.
In the incoming cabinet, the positions of the cable terminals of the phase B and the phase C are exchanged, so that the incoming cabinet and the connection cabinet are in the same phase, and the adjusted cable lapping condition is shown in fig. 8.
In the outgoing line cabinet, the cable terminals corresponding to the B-phase and C-phase cable terminals are interchanged, so that the incoming line cabinet and the interconnection cabinet are in the same phase, and the adjusted cable overlapping condition is shown in fig. 9.
When the phase sequence of the outgoing line cabinet is [ a, c, b ], [ b, a, c ], [ b, c, a ], [ c, a, b ], [ c, b, a ], the cable terminal overlapping condition can be drawn with reference to fig. 7, the adjustment method in the incoming line cabinet can be drawn with reference to fig. 8, and the adjustment method in the outgoing line cabinet can be drawn with reference to fig. 9.
When the phase sequence of the outgoing line cabinet is [ a, c, b ], [ b, a, c ], [ b, c, a ], [ c, a, b ], [ c, b, a ]5, the adjusting method in the incoming line cabinet is as follows: interchanging the positions of the cable terminals of the B phase and the C phase; the adjusting method in the outgoing line cabinet comprises the following steps: and exchanging the positions of the corresponding cable terminals of the B-phase cable terminal and the C-phase cable terminal.
Example 3
When phase decision matrix
I.e. by
Inlet wire =
A, B are opposite in phase sequence.
The phase modulation method can be obtained by referring to the analysis procedure of example 2.
Adjusting the incoming line cabinet: the a-phase and B-phase cable terminations are transposed.
Adjusting the outgoing line cabinet: and exchanging the positions of the corresponding cable terminals of the A-phase cable terminal and the B-phase cable terminal.
Example 4
When phase decision matrix
I.e. by
Inlet wire =
A, C are opposite in phase sequence.
The phase modulation method can be obtained by referring to the analysis procedure of example 2.
Adjusting the incoming line cabinet: the phase a and phase C cable terminations are interchanged.
Adjusting the outgoing line cabinet: and exchanging the positions of the corresponding cable terminals of the A-phase cable terminal and the C-phase cable terminal.
Example 5
When phase decision matrix
I.e. by
Inlet wire =
At time A, B, C the phase sequence was all wrong.
At this time, the phase sequence of the outgoing line cabinet may be [ a, b, c ], [ a, c, b ], [ b, a, c ], [ b, c, a ], [ c, a, b ], [ c, b, a ] 6.
When the phase sequence of the outgoing line cabinet is [ a, b, c ], the cable termination is lapped as shown in fig. 10.
In the incoming line cabinet, the phase a cable terminal is adjusted to the phase B position, the phase B cable terminal is adjusted to the phase C position, and the phase C cable terminal is adjusted to the phase a position, so that the incoming line cabinet and the interconnection cabinet are in the same phase, and the adjusted cable lapping condition is as shown in fig. 11.
In the outgoing cabinet, a cable terminal (outgoing cabinet B-phase cable terminal) corresponding to the incoming cabinet A is adjusted to a cable terminal (outgoing cabinet A-phase cable terminal) corresponding to a busbar with the incoming cabinet phase sequence being a phase a; a cable terminal (an outgoing cabinet C-phase cable terminal) corresponding to the incoming cabinet B is adjusted to a cable terminal (an outgoing cabinet B-phase cable terminal) corresponding to a busbar with the incoming cabinet phase sequence being B-phase; the cable terminal corresponding to the incoming line cabinet C (outgoing line cabinet a-phase cable terminal) is tuned to the cable terminal corresponding to the busbar whose incoming line cabinet phase sequence is C-phase (outgoing line cabinet C-phase cable terminal), and the incoming line cabinet and the interconnection cabinet can be in the same phase, and the adjusted cable lapping condition is shown in fig. 12.
When the phase sequence of the outgoing line cabinet is 5 cases of [ a, c, b ], [ b, a, c ], [ b, c, a ], [ c, a, b ], [ c, b, a ], the adjusting methods in the incoming line cabinet are as follows: adjusting the terminal of the A-phase cable to a B-phase position, adjusting the terminal of the B-phase cable to a C-phase position, and adjusting the terminal of the C-phase cable to an A-phase position; the adjustment method in the outgoing line cabinet comprises the following steps: and the cable terminal corresponding to the incoming line cabinet A is adjusted to the cable terminal corresponding to the busbar with the incoming line cabinet phase sequence being phase a, the cable terminal corresponding to the incoming line cabinet B is adjusted to the cable terminal corresponding to the busbar with the incoming line cabinet phase sequence being phase B, and the cable terminal corresponding to the incoming line cabinet C is adjusted to the cable terminal corresponding to the busbar with the incoming line cabinet phase sequence being phase C.
Example 6
When the nuclear phase result is
I.e. by
Inlet wire =
At time A, B, C the phase sequence was all wrong.
The phase modulation method can be obtained by referring to the analysis procedure of example 5.
Adjusting the incoming line cabinet: adjusting the terminal of the A-phase cable to a C-phase position, adjusting the terminal of the B-phase cable to the A-phase position, and adjusting the terminal of the C-phase cable to the B-phase position;
in the outgoing cabinet, the cable terminal corresponding to the incoming cabinet A is adjusted to the cable terminal corresponding to the busbar with the phase sequence of the incoming cabinet being a phase a; the cable terminal corresponding to the incoming line cabinet B is adjusted to the cable terminal corresponding to the busbar with the phase sequence of the incoming line cabinet being B phase; and C, adjusting the cable terminal corresponding to the incoming line cabinet C to the cable terminal corresponding to the busbar with the incoming line cabinet phase sequence being C phase.
In the phase modulation method in the 6 embodiments, if phase modulation is performed in the outgoing line cabinet, the lapping condition of each phase cable on the busbar between the incoming line cabinet and the outgoing line cabinet needs to be known, and the phase modulation method is input in a wiring mode through an interface shown in fig. 4.
The 6 embodiments cover all possible situations during phase checking and various possible situations of cable lapping between the incoming line cabinet and the outgoing line cabinet, so that wiring is changed according to the method, and the phase sequence of the incoming line cabinet and the phase sequence of the contact cabinet after wiring is changed can be ensured to be 100% consistent.
In summary, the following steps: this be used for instructing lapped secondary nuclear phase appearance of cable terminal has solved and can only rely on artifical slowly to reason, consuming time and power, the problem of making mistakes easily when using current nuclear phase appearance discovery phase sequence mistake, can obtain automatically through a nuclear phase and change the scheme of connecing, just can ensure that two way power phase sequences are unanimous through once adjusting, shortens dual power engineering's power transmission time greatly, has reduced cable terminal because of distortion, the deformation that changes the connection many times and cause, has improved cable terminal operational reliability.
In the invention, three cables are distinguished by winding three yellow, green and red color bands, are spliced with the nuclear phase hole on the nuclear phase instrument according to colors, and three straight lines with different thicknesses between the outgoing line cabinet and the incoming line cabinet are used for representing different wire cores of the three-core cable in the figures 7-12 and belong to the same expression range.
Claims (8)
1. A secondary nuclear phase appearance for instructing cable termination overlap joint which characterized in that: the nuclear phase instrument comprises a shell, a processing module is arranged in the shell, a secondary nuclear phase jack is arranged at the top of the shell, and the nuclear phase jack is connected with the processing module;
the processing module comprises a central processing unit, a voltage acquisition module, a phase sequence judgment module and a change-over scheme output module, wherein the voltage acquisition module acquires voltages of different combinations between two power supply three phases input into the nuclear phase jack, the phase sequence judgment module judges whether each phase of the two power supplies is in the same phase or not according to the voltage acquisition condition, a phase sequence judgment matrix is given, and the change-over scheme output module gives a correct wiring scheme according to the phase sequence judgment matrix and gives a corresponding prompt.
2. The secondary nuclear phase meter for guiding cable termination splicing according to claim 1, wherein: the cable splicing system is characterized by further comprising a wiring mode input module, wherein the wiring mode input module is connected with the central processing unit, receives cable splicing position information input by a user, and gives a correct wiring scheme.
3. The secondary nuclear phase instrument according to claim 1, characterized in that: the secondary nuclear phase jacks comprise a wiring cabinet secondary nuclear phase jack and a connection cabinet secondary nuclear phase jack, the number of the wiring cabinet secondary nuclear phase jacks and the number of the connection cabinet secondary nuclear phase jacks are respectively three, and the wiring cabinet secondary nuclear phase jack and the connection cabinet secondary nuclear phase jack are respectively connected with the three-phase power supply input ends of the wiring cabinet and the connection cabinet.
4. The secondary nuclear phase instrument according to claim 1, characterized in that: the voltage acquisition module comprises a first voltmeter, a second voltmeter, a third voltmeter and an acquisition switch, the acquisition switch is respectively arranged on a connecting line of each secondary nuclear phase jack and the voltage acquisition module, the first voltmeter is connected with a connecting line of the cabinet side secondary nuclear phase jack in parallel, the second voltmeter is connected with a connecting line of the cabinet side secondary nuclear phase jack in parallel, and the third voltmeter is connected in series between the connecting line of the cabinet side secondary nuclear phase jack and the connecting line of the cabinet side secondary nuclear phase jack.
5. The secondary nuclear phase instrument according to claim 1, characterized in that: the prompting method is display screen display or voice prompt, the display screen and the loudspeaker are fixedly connected to the shell, the display screen and the loudspeaker are connected with the central processing unit, the phase checking instrument further comprises an operation key, and the operation key is connected with the wiring mode input module to receive cable lap joint position information input by a user.
6. A phase checking method of a secondary phase checking instrument for guiding the end lap joint of a cable is characterized by comprising the following steps:
1) the voltage acquisition module respectively starts one of the connecting wires of the secondary nuclear phase jacks at the outlet side and the connecting wires of the secondary nuclear phase jacks at the inlet side, measures and acquires voltage values through three voltmeters, and inputs the voltage values into the phase sequence judgment module;
2) the phase sequence judging module calculates an included angle between voltages of each phase of the two paths of power supplies through a cosine law according to voltages acquired by the three voltmeters so as to judge whether the two paths of power supplies are in phase or not;
3) repeating the step 1) and the step 2), finishing judging all phases of the two paths of power supplies, finally outputting a phase judgment matrix by the phase sequence judgment module, and inputting the matrix into the switching scheme output module;
4) and the switching scheme output module calculates a wiring scheme according to the phase judgment matrix output by the phase sequence judgment module, outputs the scheme and displays the scheme on a display screen or sends out prompt voice of the corresponding wiring scheme.
7. The phase checking method of the secondary phase checking instrument for guiding the cable terminal to be lapped as claimed in claim 6, wherein the judgment of whether the two power supplies in the step 2) are in phase is realized by the following formula:
wherein U is1Is a sampled value of a first voltmeter, U2Is a sampled value of a second voltmeter, U3Sampling values of a third voltmeter;
8. The phase verification method of the secondary phase verification instrument for guiding cable termination splicing according to claim 6, wherein: the matrix is a 3-by-3 matrix, 1-3 rows of the matrix respectively represent an incoming line cabinet A, B, C phase busbar, and 1-3 columns of the matrix respectively represent a connection cabinet A, B, C phase busbar; if the element of the i row and the j column of the matrix is 1, the voltage of the i-phase busbar of the incoming line cabinet and the voltage of the j-phase busbar of the interconnection cabinet are in the same phase; if the element of i row and j column of the matrix is 0, it represents that the voltage in the i-phase busbar of the incoming line cabinet is out of phase with the voltage in the j-phase busbar of the connection cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112202113A (en) * | 2020-09-18 | 2021-01-08 | 国网浙江兰溪市供电有限公司 | Method for shortening cable connection construction period |
| CN112946513A (en) * | 2021-02-03 | 2021-06-11 | 山东钢铁股份有限公司 | Phase checking method for power supply of transformer substation |
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