JP7319633B2 - Arrangement distance setting device and arrangement distance setting method for measuring terminals - Google Patents

Description

The present invention is a measuring terminal arrangement for setting a distance between arrangement of a plurality of measuring terminals when a plurality of measuring terminals for locating a ground fault point are arranged in a distribution system including branch paths. The present invention relates to an inter-distance setting device and an inter-arrangement distance setting method.

For example, when a ground fault occurs in a distribution line (for example, a 6 kV distribution system), there is a known ground fault location system that locates the location of the ground fault in the distribution line (for example, See Patent Document 1).

This ground fault point locating system includes a plurality of measuring terminals installed along a distribution line and a ground fault point locating device installed in an electric power company or the like. The plurality of measurement terminals associate information indicating the zero-phase current and zero-phase voltage obtained from sensors that detect the current and voltage of the distribution line with information indicating the current time obtained from the GPS satellites to locate the ground fault point. Send to device. On the other hand, the ground-fault point locating device locates the ground-fault point by performing a predetermined calculation based on the information indicating the zero-phase current and the zero-phase voltage obtained from the plurality of measuring terminals and the information indicating the current time.

Japanese Patent Application Laid-Open No. 2004-132762

In general, a power distribution system is configured including various branch paths according to the environment of the area where the power distribution lines are installed. When arranging a plurality of measurement terminals in a distribution system that includes such a branch, the distance between the arrangement of the plurality of measurement terminals should be adjusted so that the ground fault location error of the ground fault point locator falls within the allowable range. There is a need. However, since the multiple measurement terminals are placed on the existing poles on which the distribution lines are installed, the location error of the ground fault point by the ground fault point location device may fall outside the allowable range depending on the arrangement of the multiple measurement terminals. There was a fear that I would die.

Therefore, in the present invention, when arranging a plurality of measuring terminals in a distribution system including branch paths, it is possible to set the inter-arrangement distance of the plurality of measuring terminals so that the location error of the ground fault point falls within an allowable range. It is an object of the present invention to provide an inter-arrangement distance setting device and an inter-arrangement distance setting method for measuring terminals that are possible.

SUMMARY OF THE INVENTION The main invention for solving the above-mentioned problems is to store information indicating the zero-phase current and zero-phase voltage output from a sensor that detects the current and voltage of the distribution line when a ground fault occurs in the distribution line. First to third measuring terminals that transmit information indicating time to a ground fault point locating device for locating ground fault points in the distribution line, respectively, at the first and second positions of the distribution line, the Inter-arrangement distance setting of the measurement terminals, for setting the inter-arrangement distances of the first to third measurement terminals when arranged at a third position of the distribution line branched from a branch point between the first and second positions. A device comprising a first distance from the first measuring terminal to the branch point, a second distance from the second measuring terminal to the branch point, and a third distance from the third measuring terminal to the branch point. an input unit for inputting a value indicating a distance and a minimum value that can be set as a difference between the arrangement distances of the first to third measurement terminals; a distance determination unit that determines whether or not a value that satisfies a predetermined condition set in advance between the third distance and the minimum value; and a setting unit configured to set inter-arrangement distances of the first to third measuring terminals based on values indicating the first to third distances, when satisfying the above.
Other features of the present invention will become apparent from the accompanying drawings and the description herein.

According to the present invention, when arranging a plurality of measuring terminals in a distribution system including a branch line, it is possible to set the inter-arrangement distance of the plurality of measuring terminals so that the location error of the ground fault point falls within the allowable range. It becomes possible.

1 is a block diagram showing a ground fault point locating system; FIG. It is a block diagram which shows an example of the distance setting apparatus between arrangement|positioning which concerns on this embodiment. FIG. 3 is a schematic diagram showing an example of a case in which three measurement terminals are arranged in a distribution system including a T-shaped branch. 4 is a graph showing the relationship between orientation x and surge propagation velocity v. FIG. 4 is a table showing surge propagation velocity v _ε that minimizes variation when locating a ground fault point; FIG. 11 is another table showing surge propagation velocity v _ε that minimizes the variation when locating the ground fault point; FIG. FIG. 4 is a schematic diagram showing an example in which four measurement terminals are arranged in a distribution system including a cross-shaped branch. 4 is a graph showing the relationship between the orientation x and the surge propagation velocity v when the surge arrival time contains an error; It is a flow chart which shows an example of operation of the arrangement distance setting device concerning this embodiment.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
===Ground fault location system===

FIG. 1 is a block diagram showing a ground fault location system. In addition, in FIG. 1, in order to explain the basic configuration and operation of the ground fault point locating system, it is assumed that the power distribution system does not include a branch path.

The ground fault locating system 100 is a system that locates the location of the ground fault on the distribution line 200 when the ground fault occurs on the distribution line 200 .

The ground fault point locating system 100 includes a plurality of sensors 300, a plurality of measuring terminals 400, a ground fault point locating device 500, and an arrangement distance setting device 800 as means for locating ground fault points. ing.

A plurality of sensors 300 are installed for each column 600, respectively. Then, when a ground fault occurs in distribution line 200 , sensor 300 detects the zero-phase current and zero-phase voltage of distribution line 200 on support 600 . In order to protect the sensor 300, the sensor 300 may be stored in a storage box (not shown) in which a switch for connecting or disconnecting the distribution line 200 is stored.

A plurality of measurement terminals 400 are installed for each column 600, and are connected to the ground fault point locating device 500 via wireless communication, for example. Measurement terminal 400 then associates information indicating the zero-phase current and zero-phase voltage obtained from sensor 300 with information indicating the current time obtained from GPS satellite 700 and transmits the information to ground fault location device 500 . Note that the measuring terminal 400 may be connected to the ground fault point locating device 500 via a wired communication line.

The ground fault point locating device 500 centrally manages the plurality of measuring terminals 400 via wireless communication so that the ground fault point can be located. The ground fault point locating device 500 is obtained from the i-th combination (for example, the combination of the two measuring terminals 400 with the shortest inter-installation distance) among the n combinations of the two measuring terminals 400 sandwiching the ground fault point. Based on the information indicating the zero-phase current and the zero-phase voltage and the information indicating the current time, the ground fault point is located by performing a predetermined calculation.

但し、地絡点を挟む２つの計測端末４００のｉ番目の組合せにおいて、
ｘ_ｉ：地絡点から一方の計測端末４００までの距離（以下、標定とも言う）
Ｌ_ｉ：２つの計測端末４００間の配電線路２００上の距離
Δｔ_ｉ：地絡点から２つの計測端末４００までのサージ到達時刻の差
ｖ：サージ伝搬速度
である。 The ground fault point locating device 500 locates the ground fault point according to the following formula (1).

However, in the i-th combination of the two measurement terminals 400 sandwiching the ground fault point,
x _i : Distance from the ground fault point to one measuring terminal 400 (hereinafter also referred to as orientation)
L _i : distance on distribution line 200 between two measurement terminals 400 Δt _i : difference in surge arrival times from the ground fault point to two measurement terminals 400 v: surge propagation velocity.

Here, when the surge arrival time from the ground fault point to one of the measuring terminals 400 is _t1 , and the surge arrival time from the ground fault point to the other measuring terminal 400 is _t2 , the difference in the surge arrival times Δt _i becomes Δt _i =t ₂ -t ₁ .

The method for locating the ground fault point is disclosed, for example, in Patent Document 1, so detailed description thereof will be omitted.

In addition, the ground fault point locating device 500 has a variation (standard deviation) in the location of n ground fault points calculated based on information output from n combinations of two measuring terminals 400 sandwiching the ground fault point. is minimized, the surge propagation velocity v used when calculating the ground fault point is calculated according to the following equation (2).

FIG. 2 is a block diagram showing an example of the arrangement distance setting device according to this embodiment.
The arrangement distance setting device 800 sets the first to third positions (FIG. 3) where the measurement terminals 400A to 400C should be arranged so as to improve the location accuracy of the ground fault point in the T-branch distribution line 200. It is the device to set. In addition, the inter-arrangement distance setting device 800 determines the first to fourth positions (FIG. 7) where the measurement terminals 400A to 400D should be arranged so as to improve the accuracy of locating the ground fault point in the cross-branched distribution line 200. It is also a device for setting The arrangement distance setting device 800 includes an input section 810, a distance determination section 820, and a setting section 830 as means for realizing the above functions. The arrangement distance setting device 800 includes a microcomputer, and the functions of the input section 810, the distance determination section 820, and the setting section 830 are realized by software processing in which the microcomputer executes programs. Note that the function executed by the arrangement distance setting device 800 may be implemented in the ground fault point locating device 500 .
===Setting the distance between measurement terminals===

<<T-shaped branch>>
FIG. 3 is a schematic diagram showing an example when three measurement terminals are arranged in a distribution system including a T-shaped branch.

In FIG. 3 , the distribution line 200 includes a first distribution line 210 and a second distribution line 220 . The first distribution line 210 is a main line installed on the pillar 600 so as to extend from the substation toward the load (consumer). The second distribution line 220 branches from a predetermined position between first and second positions (described later) of the first distribution line 210, and extends from the branch point toward another load (customer). It is a branch line where 400 A of measurement terminals (1st measurement terminal) are arrange|positioned in the 1st position of the upstream of the 1st distribution line 210 (substation side). The measurement terminal 400B (second measurement terminal) is arranged at a second position on the downstream side (load side) of the first distribution line 210 . The measurement terminal 400</b>C (third measurement terminal) is installed at a third position on the downstream side (another load side) of the branch point of the second distribution line 220 . For example, when there is a ground fault point at a predetermined position between the first position and the branch point in the first distribution line 210, the combination of the two measurement terminals 400 sandwiching the ground fault point is the measurement terminals 400A and 400B and the measurement terminals 400A and 400B. There are two types of terminals 400A and 400C (n=2).

here,
L ₁ : Distance on distribution line 200 between measurement terminals 400A and 400B L ₂ : Distance on distribution line 200 between measurement terminals 400A and 400C t _a : Surge arrival time from ground fault point to measurement terminal 400A t _b : Surge arrival time from ground fault point to measuring terminal 400B t _c : Surge arrival time from ground fault point to measuring terminal 400C Δt ₁ : Difference between surge arrival times t _a and t _{b t b −} t _a
Δt ₂ : difference t _c −t _a between surge arrival times t _a and t _c
, the surge propagation velocity v is expressed as in Equation (3) using Equation (2).

Further, the surge propagation velocity v is shown as Equation (4) by rearranging Equation (3).

When L ₁ =L ₂ , the numerator of equation (4) is 0, so the surge propagation velocity v is 0. At this time, assuming that the impedance of the distribution line 200 existing between the measurement terminals 400A and 400B and between the measurement terminals 400A and 400C is equal, t _b =t _c , and the numerator and denominator of equation (4) are both 0. Therefore, the surge propagation velocity v diverges and the ground fault point cannot be located.

Equation (1) is a linear function with the orientation x and the surge propagation velocity v as variables. Therefore, when the two orientations calculated from the equation (1) based on the information from the measurement terminals 400A and 400B and the measurement terminals 400A and 400C are x ₁ and x ₂ respectively, the two orientations x ₁ and x ₂ are The surge propagation velocity v when the variation is minimized is determined to be the value when L ₁ ≠L ₂ and x ₁ =x ₂ . In this way, when setting the inter-arrangement distances of the measurement terminals 400A to 400C, it is sufficient to satisfy the condition of L ₁ ≠L ₂ , but in reality the error included in the surge arrival times t _b and t _c must be considered.

FIGS. 4A and 4B are graphs showing the relationship between the orientation x and the surge propagation velocity v. FIG.
4(A) and 4(B), the vertical axis indicates the orientation x, the horizontal axis indicates the surge propagation velocity v, and the slope of the solid line indicating the orientations x ₁ and x ₂ is the difference in surge arrival times Δt ₁ , Δt ₂ , but assumes that it does not include the errors of the surge arrival times t _a , t _b , t _c .

FIG. 4A shows the location x and _the surge propagation velocity v when |L ₁ −L ₂ | is large, that is, when | _{Δt 1 −Δt 2} | , the solid line indicating the orientation x ₁ has a positive gradient (Δt ₁ (=t _b −t _a )<0)), and the solid line indicating the orientation x ₂ has a negative gradient (Δt ₂ (=t _c −t _a )>0)). For example, in this case, if an error in the surge arrival time _tc is included, the solid line indicating the orientation _x2 shifts to the position indicated by the dashed line as the value of _Δt2 changes. However, since |L ₁ -L ₂ |(|Δt ₁ -Δt ₂ |) is large, the effect on the surge propagation velocity v when x ₁ =x ₂ is small.

FIG. 4(B) shows when |L ₁ −L ₂ | is small, _that is, when | _{Δt 1 −Δt 2} | , the solid line indicating the orientation x ₁ has a positive gradient (Δt ₁ (=t _b −t _a )<0)), and the solid line indicating the orientation x ₂ is the orientation x ₁ has a gentler positive slope (Δt ₂ (=t _c −t _a )<0)) than the solid line indicating . For example, in this case, if an error in the surge arrival time _tc is included, the solid line indicating the orientation _x2 shifts to the position indicated by the dashed line as the value of _Δt2 changes. Then, since |L ₁ -L ₂ |(|Δt ₁ -Δt ₂ |) is small, the influence on the surge propagation velocity v when x ₁ =x ₂ is established becomes large, and the positioning accuracy is lowered.

In this _way , depending on the magnitude of |L ₁ −L ₂ | _, the effect on the surge propagation velocity v when x ₁ =x ₂ is established changes. is appropriate in consideration of the errors in the surge arrival times _tb and _tc . For example, an error (for example, ±350 [ns]) included in the information indicating the current time obtained from the GPS satellite 700 is considered as an error factor of the surge arrival times t _b and t _c .

The surge propagation speed v _ε , where t _ε is the error included in the surge arrival time difference t _b −t _c , is expressed by Equation (5) by modifying Equation (4).

Since the error t _ε includes the surge arrival times t _b and t _c , the range of the error t _ε is
-700 [ns] ≤ _tε ≤ +700 [ns]
can be considered.

Therefore, when the error t _ε is −700 [ns] (maximum delay error) and +700 [ns] (maximum lead error), a plurality of values prepared in advance as L ₁ −L ₂ and surge Using a plurality of values prepared in advance as the propagation velocity v (the first surge propagation velocity in which the error t _ε is not considered), the surge propagation velocity v _ε (the first surge propagation velocity in which the error t _ε is considered) is calculated from Equation (5). 2 surge propagation velocity). It should be noted that the value of L ₁ -L ₂ shall be a plurality of values within the range of 50 [m] to 400 [m], and the value of the surge propagation velocity v shall be capable of locating the ground fault point. 50 [m/μs] to 350 [m/μs], the maximum value being 300 [m/μs].

FIG. 5 is a table showing the surge propagation velocity v _ε calculated when the error t _ε is −700 [ns]. FIG. 6 is a table showing the surge propagation velocity _vε calculated when the _error tε is +700 [ns]. The surge propagation velocity v _ε included in the range of 50 [m/μs] to 350 [m/μs] in which the ground fault point can be located is enclosed by a thick frame. If, for example, 150 [m/μs] is selected as the surge propagation velocity v, the value that should minimize L ₁ -L ₂ is 190 when the error t _ε is −700 [ns], as shown in FIG. [m], and as shown in FIG. 6, when the error t _ε is +700 [ns], the value at which L ₁ −L ₂ should be minimized is 100 [m]. In _this case, the value at which L ₁ −L ₂ should _be minimized is 190 [m]. set to 200 [m]. In other words, it can be seen that the difference in the inter-arrangement distance between the measurement terminals 400A and 400B and the measurement terminals 400A and 400C is required to be 200 m or more.

When the respective distances from the branch point of the distribution line 200 to the measurement terminals 400A to 400C are L _a , L _b , and L _c (where L _a >L _b >L _c ), good location accuracy can be obtained. When arranging the measurement terminals 400A to 400C so that L _c is used as a reference,
L _b ≧L _c +200 [m] (6)
L _a ≧L _b +200 [m] (7)
It is a condition that the following two expressions are satisfied at the same time. Therefore, the first to third positions on the distribution line 200 are determined so as to satisfy the above conditions, and the measurement terminals 400A to 400C are arranged at the first to third positions. However, the difference of 200 m in the distance between arrangements under the above conditions is an example when the error of the GPS satellite 700 is ±350 [ns]. Let Y [m] be the distance to be set as the difference between the distances between the measurement terminals 400A and 400C. The condition is that the following equations must be satisfied at the same time.
L _b ≧L _c +Y[m] (8)
L _a ≧L _b +Y[m] (9)
The first to third positions may be the positions of the pillars 600 that satisfy the above conditions among the pillars 600 on which the distribution line 200 is installed.

<<Cross branch>>
FIG. 7 is a schematic diagram showing an example when four measurement terminals are arranged in a distribution system including a cross-shaped branch. 7 that are the same as those shown in FIG. 3 are denoted by the same reference numerals, and descriptions thereof are omitted.

In FIG. 7 , the distribution line 200 includes a first distribution line 210 , a second distribution line 220 and a third distribution line 230 . The third distribution line 230 branches off from a predetermined position between the first and second positions of the first distribution line 210 and extends from the branch point toward another load (customer) on the pillar 600. It is a branch line to be erected. In this embodiment, the branch points of the second distribution line 220 and the third distribution line 230 are assumed to be the same for convenience of explanation. A measurement terminal 400</b>D (fourth measurement terminal) is installed at a fourth position on the downstream side (another load side) of the branch point of the third distribution line 230 . For example, when there is a ground fault point at a predetermined position between the first position and the branch point in the first distribution line 210, the combination of the two measurement terminals 400 sandwiching the ground fault point is the measurement terminals 400A and 400B, the measurement There are three types (n=3) of terminals 400A and 400C and measurement terminals 400A and 400D.

here,
L ₃ : Distance on distribution line 200 between _measurement terminals 400A and 400D t _d : Surge arrival time from ground fault point to measurement terminal 400D Δt ₃ : Difference t _d −t _a between surge arrival times ta and t _d
, the surge propagation velocity v is expressed by Equation (10) using Equation (2).

If x ₁ , x ₂ and x ₃ are the orientations calculated from the equation (1) based on the information from the measurement terminals 400A and 400B, the measurement terminals 400A and 400C, and the measurement terminals 400A and 400D, the surge propagation velocity v is calculated as the value when the orientations x ₁ , x ₂ and x ₃ are equal (the value at the intersection of the orientations x ₁ , x ₂ and x ₃ ) according to equation (10). However, since _{the surge} arrival times t _a , t _b , t _c , and t _d actually contain an error t _ε , _the surge propagation velocity v is It is calculated as a value when

FIG. 8 is a graph showing the relationship between the orientation x and the surge propagation velocity v when the surge arrival times t _a , t _b , t _c , and t _d include the error _tε . In FIG. 8, the vertical axis indicates the orientation x, and the horizontal axis indicates the surge propagation velocity v. If the surge arrival times t _a , t _b , t _c , and t _d contain an error t _ε , the crossing points of the orientations x ₁ , x ₂ , and x ₃ no longer exist. It is calculated as a value that minimizes the range of variation of ₁ , _x2 , and _x3 (the value at the position of the dashed line).

When L ₁ =L ₂ =L ₃ , the surge propagation velocity v diverges because the orientations x ₁ , x ₂ and x ₃ are equal. However, since the surge arrival times t _a , t _b , t _c , and t _d actually contain an error t _ε , the surge propagation speed v becomes 0 [m/μs] and the surge propagation speed v deviates from the minimum condition of 50 [m/μs], and the ground fault point cannot be located.

For example, when L ₁ ≠L ₂ =L ₃ , the surge propagation velocity v is calculated as the value when the orientations x ₁ and x ₂ (=x ₃ ) are equal, as in the case of the T-branch. It becomes possible to orient the contact points. However, since the surge arrival times t _a , t _b , t _c , and t _d actually contain an error t _ε , the surge propagation velocity v is within the range of variation of the orientations x ₁ , x ₂ , and x ₃ is calculated as the value that minimizes By the way, when _{L 1} ≠L _{2 =} L ₃ , two pieces _of information related to the orientations _{x 1} and x ₂ (or x ₃ ) are used. , x ₂ , and x ₃ are used, the location accuracy is improved when L ₁ ≠L ₂ ≠L ₃ . Therefore, when setting the first to fourth positions where the measurement terminals 400A to 400D should be arranged in the cross-branched distribution line 200, it is preferable that L ₁ ≠L ₂ ≠L ₃ .

7, the first and second distribution lines 210, 220 and the measurement terminals 400A, 400B, 400C are the T-branched distribution line 200 shown in FIG. The terminals 400A, 400B, and 400D correspond to the T-branch distribution line 200 shown in FIG. That is, the cross-branched distribution line 200 shown in FIG. 7 is configured by combining two T-shaped branched distribution lines 200 shown in FIG. 3 . Therefore, the difference in the distance between the measurement terminals 400A and 400B, the measurement terminals 400A and 400C, and the measurement terminals 400A and 400D must be 200 m or more, as in the case of the T-branched distribution line 200 .

When the respective distances from the branch points of the distribution line 200 to the measurement terminals 400A to 400D are L _a , L _b , L _c , and L _d (where L _a > L _b > L _c > L _d ), good When arranging the measurement terminals 400A to 400D so as to obtain orientation accuracy, L _c is used as a reference,
L _b ≧L _c +200 [m] (11)
L _a ≧L _b +200 [m] (12)
L _d ≤ L _c -200 [m] (13)
It is a condition that the following three expressions are satisfied at the same time. Therefore, the first to fourth positions on the distribution line 200 are determined so as to satisfy the above conditions, and the measuring terminals 400A to 400D are arranged at the first to fourth positions. However, the difference of 200 m in the distance between arrangements under the above conditions is an example when the error of the GPS satellite 700 is ±350 [ns]. Let Y [m] be the distance to be set as the difference between the arrangement distances of the measurement terminals 400A and 400C and the measurement terminals 400A and 400D. , it is a condition that the following three equations are simultaneously satisfied with _Lc as a reference.
L _b ≧L _c +Y[m] (14)
L _a ≧L _b +Y[m] (15)
_Ld≤Lc - _Y [m] (16)
The first to fourth positions may be the positions of the pillars 600 that satisfy the above conditions among the pillars 600 on which the distribution line 200 is installed.
===How to set the distance between layouts===

First, the case of arranging the measurement terminals 400A to 400C on the T-branched distribution line 200 will be described.

Values indicating the distance L _a from the measurement terminal 400A to the branch point, the distance L _b from the measurement terminal 400B to the branch point, and the distance L _c from the measurement terminal 400C to the branch point are input to the input unit 810 . In addition to the above three values, a value Y indicating the minimum value that can be set as the difference between the arrangement distances of the measurement terminals 400A to 400C is input. These four values L _a , L _b , L _c and Y may be information input from a keyboard (not shown) or information read from a recording medium (not shown).

When L _a , L _b , L _c , and Y are input through the input unit 810, the distance determination unit 820 determines whether the input values satisfy the conditions of equations (8) and (9). I do. When L _a , L _b , and L _c satisfy the above conditions in the distance determination section 820 , the process proceeds to the setting section 830 . If L _a , L _b , and L _c do not satisfy the above conditions in the distance determination unit 820 , the input unit 810 inputs the values of L _a , L _b , L _c , and Y again.

Setting section 830 sets the distances between measurement terminals 400A, 400B, and 400C based on L _a , L _b , and L _c that satisfy the conditions of formulas (8) and (9) in distance determination section 820 . be.

As a result, it is possible to set the first to third positions where the measuring terminals 400A to 400C should be arranged so as to improve the location accuracy of the ground fault point in the T-branched distribution line 200. FIG.

Next, the case of arranging the measuring terminals 400A to 400D on the cross-branched distribution line 200 will be described.

In this case, the input unit 810 stores the distance L _a from the measurement terminal 400A to the branch point, the distance L _b from the measurement terminal 400B to the branch point, the distance L _c from the measurement terminal 400C to the branch point, and the branch point from the measurement terminal 400D. A value is entered that indicates the distance L _d to the point.

As in the case of the T-branched distribution line 200, the distance determination unit 820 determines that L _a , L _b , L _c , L _d , and Y input to the input unit 810 are obtained by formulas (14), (15), It is determined whether the value satisfies the condition (16). If the condition is satisfied by the distance determination unit 820, the process proceeds to the setting unit 830, and if not satisfied, the process returns to the input unit 810 and L _a , L _b , L _c , L _d , and Y are input again.

In the setting unit 830, based on L _a , L _b , L _c , and L _d that satisfy the conditions of formulas (14), (15), and (16) in the distance determination unit 820, the measurement terminals 400A, 400B, A distance between 400C and 400D is set.

This makes it possible to set the first to fourth positions at which the measuring terminals 400A to 400D should be arranged so as to improve the location accuracy of the ground fault point in the cross-branched distribution line 200 .

FIG. 9 is a flow chart showing an example of the operation of the layout distance setting device (layout distance setting method) according to the present embodiment.
First, if the distribution line 200 is not a branch system but a straight system (step S1: NO), the process is terminated. On the other hand, if the distribution line 200 is a branch system (step S1: YES), it is determined whether the branch system is a T-shaped branch or a cross branch (step S2).

Next, when the distribution line 200 is a T-branched branch system and the measurement terminals 400A to 400C are arranged in the T-branched distribution line 200 (step S2: YES), L _a and L _b are input to the input unit 810. , L _c and Y are input (step S3).

Next, the distance determination unit 820 determines whether L _a , L _b , L _c , and Y satisfy the conditions of formulas (8) and (9) (step S4). If the determination is satisfied, the process proceeds to the setting unit 830 (step S4: YES), and if not, the input unit 810 inputs L _a , L _b , L _c , and Y again (step S4: NO ).

Next, the setting unit 830 sets the distances between the measurement terminals 400A, 400B, and 400C based on L _a , L _b , and L _c that satisfy the conditions of the distance determination unit 820 (step S5).

On the other hand, when the measurement terminals 400A to 400D are arranged in the cross-branched distribution line 200 (step S1: NO), values indicating L _a , L _b , L _c , L _d , and Y are input to the input unit 810 ( step S6).

Next, the distance determination unit 820 determines whether L _a , L _b , L _c , L _d , and Y are values satisfying the conditions of formulas (14), (15), and (16) (step S7). . If the determination is satisfied, the process proceeds to the setting unit 830 (step S7: YES), and if not, the input unit 810 inputs L _a , L _b , L _c , L _d , and Y again (step S7: NO).

Next, the setting unit 830 sets the distances between the measurement terminals 400A, 400B, 400C, and 400D based on L _a , L _b , L _c , and L _d that satisfy the conditions of the distance determination unit 820 (step S8).
===Summary===

As described above, when a ground fault occurs in the distribution line 200, the information indicating the zero-phase current and the zero-phase voltage output from the sensor 300 that detects the current and voltage of the distribution line 200 is used to indicate the current time. The first to third measurement terminals 400A to 400C, which are associated with the information and transmitted to the ground fault point locating device 500 for locating the ground fault point of the distribution line 200, are connected to the distribution line 200 (the first distribution line 210), respectively. When arranged at the third position of the distribution line 200 (second distribution line 220) branching from the branch point between the first and second positions, the first to third measurement terminals 400A to 400C, the inter-arrangement distance setting device 800 for measuring terminals, which is a first distance from the first measurement terminal 400A to the branch point and a second distance from the second measurement terminal 400B to the branch point. , the third distance from the third measuring terminal 400C to the branch point, and the minimum value that can be set as the difference between the arrangement distances of the first to third measuring terminals 400A to 400C. 810, and a distance for determining whether or not the value input to the input unit 810 satisfies a predetermined condition set in advance between the first to third distances and the minimum value. If the values input to the determination unit 820 and the input unit 810 satisfy the predetermined conditions, the first to third measurement terminals 400A to 400C are determined based on the values indicating the first to third distances. and a setting unit 830 for setting the inter-arrangement distance. Here, when the first to third distances are L _a , L _b , and L _c , respectively, and the minimum value is Y, the predetermined conditions are L _b ≧L _c +Y[m], L _a ≧ It includes two conditional expressions denoted by L _b +Y[m].

Further, when a ground fault occurs in the distribution line 200, the information indicating the zero-phase current and the zero-phase voltage output from the sensor 300 that detects the current and voltage of the distribution line 200 is associated with the information indicating the current time. Then, the first to fourth measuring terminals 400A to 400D, which transmit to the ground fault locating device 500 for locating the ground fault point of the distribution line 200, are respectively connected to the first and fourth measurement terminals 400A to 400D of the distribution line 200 (first distribution line 210). 2 position, the third position of the distribution line 200 (second distribution line 220) branching from the branch point between the first and second positions, the distribution line 200 (second distribution line 220) branching from the branch point to the opposite side to the third position A measurement terminal arrangement distance setting device 800 for setting the arrangement distance of the first to fourth measurement terminals 400A to 400D when arranged at the fourth position of the three distribution lines 230), the first measurement terminal A first distance from 400A to the branch point, a second distance from the second measurement terminal 400B to the branch point, a third distance from the third measurement terminal 400C to the branch point, and a fourth measurement terminal 400D to the branch point. and the minimum value that can be set as the difference between the arrangement distances of the first to fourth measurement terminals 400A to 400D; is a value that satisfies a predetermined condition set in advance between the first to fourth distances and the minimum value, and the input unit 810. a setting unit 830 for setting the inter-arrangement distances of the first to fourth measuring terminals 400A to 400D based on the values indicating the first to fourth distances when the above values satisfy the above predetermined conditions; It has Here, when the first to fourth distances are L _a , L _b , L _c , and L _d , respectively, and the minimum value is Y, the predetermined condition is L _b ≧L _c +Y [m], It includes three conditional expressions represented by L _a ≧L _b +Y[m] and L _d ≦L _c −Y[m].

The information indicating the current time is information obtained from the GPS satellites 700, and the minimum value Y is a value that takes into consideration the error associated with the current time of the GPS satellites.

By adopting the inter-arrangement distance setting device 800 as described above, when a plurality of measurement terminals are arranged on the distribution line 200 including branch paths such as T-shaped branches and cross-shaped branches, the ground fault point location error It is possible to set the inter-arrangement distance of a plurality of measurement terminals so that the distance between the measurement terminals is surely within the allowable range.

It should be noted that the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention also includes equivalents thereof.

100 Ground fault point locating system 200 Distribution line 210 First distribution line 220 Second distribution line 230 Third distribution line 300 Sensor 400 (400A to 400D) Measuring terminal 500 Ground fault point locating device 600 Pole 700 GPS satellite 800 Inter-arrangement distance setting Device 810 Input unit 820 Distance determination unit 830 Setting unit

Claims (10)

When a ground fault occurs in the distribution line, the information indicating the zero-phase current and the zero-phase voltage output from the sensor that detects the current and voltage of the distribution line is associated with the information indicating the current time, and the information indicating the current time is associated with the distribution line. The first to third measuring terminals for transmitting to a ground fault point locating device for locating the ground fault point of the electric wire are respectively set at the first and second positions of the distribution line and the branch point between the first and second positions. An inter-arrangement distance setting device for measuring terminals that sets the inter-arrangement distances of the first to third measurement terminals when arranged at a third position of the distribution line branching from
a first distance from the first measuring terminal to the branch point; a second distance from the second measuring terminal to the branch point; a third distance from the third measuring terminal to the branch point; an input unit for inputting a value indicating a minimum value that can be set as a difference between the arrangement distances of the first to third measurement terminals;
a distance determination unit that determines whether the value input to the input unit satisfies a predetermined condition set in advance between the first to third distances and the minimum value;
A setting unit that sets inter-arrangement distances of the first to third measuring terminals based on values indicating the first to third distances when the values input to the input unit satisfy the predetermined condition. and,
An arrangement distance setting device for measuring terminals, comprising: The predetermined condition is that when the first to third distances are L _a , L _b , and L _c , respectively, and the minimum value is Y,
L _b ≧L _c +Y[m]
L _a ≧L _b +Y [m]
2. The inter-arrangement distance setting device for measuring terminals according to claim 1, comprising two conditional expressions represented by: . When a ground fault occurs in the distribution line, the information indicating the zero-phase current and the zero-phase voltage output from the sensor that detects the current and voltage of the distribution line is associated with the information indicating the current time, and the information indicating the current time is associated with the distribution line. The first to fourth measuring terminals for transmitting to a ground fault point locating device for locating the ground fault point of the electric wire are respectively set at the first and second positions of the distribution line and the branch point between the first and second positions. between the arrangement of the first to fourth measurement terminals when arranged at a third position of the distribution line branched from and a fourth position of the distribution line branched from the branch point on the side opposite to the third position A distance setting device between arrangement of measurement terminals for setting a distance,
a first distance from the first measuring terminal to the branch point; a second distance from the second measuring terminal to the branch point; a third distance from the third measuring terminal to the branch point; an input unit for inputting a value indicating a fourth distance from the four measuring terminals to the branch point and a minimum value that can be set as a difference between the arrangement distances of the first to fourth measuring terminals;
a distance determination unit that determines whether the value input to the input unit satisfies a predetermined condition set in advance between the first to fourth distances and the minimum value;
A setting unit that sets inter-arrangement distances of the first to fourth measuring terminals based on values indicating the first to fourth distances when the values input to the input unit satisfy the predetermined condition. and,
An arrangement distance setting device for measuring terminals, comprising: The predetermined condition is that when the first to fourth distances are L _a , L _b , L _c , and L _d , respectively, and the minimum value is Y,
L _b ≧L _c +Y[m]
L _a ≧L _b +Y [m]
_Ld ≤ _Lc - Y [m]
4. The inter-arrangement distance setting device for measuring terminals according to claim 3, wherein the three conditional expressions represented by are included. The information indicating the current time is information obtained from a GPS satellite,
5. The inter-arrangement distance setting device for measuring terminals according to claim 1, wherein the minimum value is a value considering an error related to the current time of GPS satellites. When a ground fault occurs in the distribution line, the information indicating the zero-phase current and the zero-phase voltage output from the sensor that detects the current and voltage of the distribution line is associated with the information indicating the current time, and the information indicating the current time is associated with the distribution line. The first to third measuring terminals for transmitting to a ground fault point locating device for locating the ground fault point of the electric wire are respectively set at the first and second positions of the distribution line and the branch point between the first and second positions. An inter-placement distance setting method for measuring terminals, for setting the inter-placement distances of the first to third measurement terminals when arranging them at a third position of the distribution line branching from
a first distance from the first measuring terminal to the branch point; a second distance from the second measuring terminal to the branch point; a third distance from the third measuring terminal to the branch point; A value indicating a minimum value that can be set as the difference between the arrangement distances of the first to third measuring terminals satisfies a predetermined condition set in advance between the first to third distances and the minimum value. a distance determination step for determining whether or not it is a value;
a setting step of setting inter-arrangement distances of the first to third measuring terminals based on the values indicating the first to third distances when the values satisfy the predetermined condition;
A method for setting a distance between arrangement of measurement terminals, comprising: The predetermined condition is that when the first to third distances are L _a , L _b , and L _c , respectively, and the minimum value is Y,
L _b ≧L _c +Y[m]
L _a ≧L _b +Y [m]
7. The inter-arrangement distance setting method of the measuring terminal according to claim 6, wherein the two conditional expressions represented by are included. When a ground fault occurs in the distribution line, the information indicating the zero-phase current and the zero-phase voltage output from the sensor that detects the current and voltage of the distribution line is associated with the information indicating the current time, and the information indicating the current time is associated with the distribution line. The first to fourth measuring terminals for transmitting to a ground fault point locating device for locating the ground fault point of the electric wire are respectively set at the first and second positions of the distribution line and the branch point between the first and second positions. between the arrangement of the first to fourth measurement terminals when arranged at a third position of the distribution line branched from and a fourth position of the distribution line branched from the branch point on the side opposite to the third position A method for setting a distance between arrangement of measurement terminals, comprising:
a first distance from the first measuring terminal to the branch point; a second distance from the second measuring terminal to the branch point; a third distance from the third measuring terminal to the branch point; 4 A value that indicates a fourth distance from the measuring terminal to the branch point and a minimum value that can be set as a difference between the arrangement distances of the first to fourth measuring terminals is equal to the first to fourth distances and the a distance determination step of determining whether or not the value satisfies a predetermined condition set in advance between the distance and the minimum value;
a setting step of setting inter-arrangement distances of the first to fourth measuring terminals based on values indicating the first to fourth distances when the values satisfy the predetermined condition;
A method for setting a distance between arrangement of measurement terminals, comprising: The predetermined condition is that when the first to fourth distances are L _a , L _b , L _c , and L _d , respectively, and the minimum value is Y,
L _b ≧L _c +Y[m]
L _a ≧L _b +Y [m]
_Ld ≤ _Lc - Y [m]
9. The inter-arrangement distance setting method of the measuring terminal according to claim 8, characterized in that the three conditional expressions represented by are included. The information indicating the current time is information obtained from a GPS satellite,
10. The inter-placement distance setting method of measuring terminals according to claim 6, wherein said minimum value is a value considering an error related to the current time of GPS satellites.

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