JPH0132313Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lightning arrester counter that measures the operating frequency and peak value of surge arresters that protect power systems from surges such as lightning surges and switching surges.

[Technical background of the invention and its problems]

Lightning arresters are protective devices that reduce surge currents generated in power systems by diverting them. Therefore, the current that normally flows through a lightning arrester is approximately on the order of mA, but when a surge occurs in the system, a surge current of several +A to several +kA flows. Surge arresters gradually deteriorate due to such surge energy processing, and it is necessary to know how often they operate. On the other hand, the surge current flowing through a lightning arrester is an important factor when considering the maintenance of the lightning arrester and the insulation coordination of the system.

For this reason, surge current measuring devices and display counters for lightning arresters are conventionally used. however,
Conventional measuring instruments for the former type can measure the surge current peak value, but cannot measure the frequency. In addition, the latter method has a problem that needs to be improved in that the operating frequency can be measured, but the peak value of the surge current cannot be measured.

[Purpose of invention]

This invention was made taking the above points into consideration.
The purpose is to provide a surge counter device for a lightning arrester that can display the number of operations for each surge current peak value and improve accuracy in maintenance management.

[Summary of the idea]

In order to achieve this purpose, the present invention provides a current detection section in series with the ground side of the lightning arrester, and connects a plurality of adjustment resistors to either the system side or the ground side terminal of this current detection section. The counter parts are connected in series in descending order of resistance value from the side, and the counter parts are individually connected in sequence between the terminal of the adjustment resistor on the opposite side to the above terminal of each adjustment resistor and the other terminal side of the current detection part. Each counter circuit is formed by the resistor and the counter section connected to the terminal of each adjustment resistor, and the peak value and the peak value of the detected current are determined by counting the discharge by the counter circuit according to the detected current. Its characteristic is to measure frequency. In addition,
It is preferable that the counter section of each counter circuit operates only as a counter circuit corresponding to the detected current.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lightning arrester counter device according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the line side terminal 11a of the lightning arrester 11 is connected to the line conductor 12, and the lightning arrester counter device 17 consisting of a current detection section 15 and a counter device 16 is connected between the ground side terminal 11b and the ground 13. do.

The current detection unit 15 connects the ground side terminal 11b and the ground 13
Non-linear resistors R ₁ and R ₂ are connected between them, and a protective gap G and a capacitor C are connected in parallel to both ends of the non-linear resistor R ₂ . Counter device 16
are both ends of the capacitor C, that is, the current detection section 15
terminal 14a and ground terminal 14b. The counter device 16 has a plurality of adjusting resistors r ₁ , r ₂ , r ₃ , ..., r _o connected in series to one side of the capacitor C in descending order of resistance value, and the respective adjusting resistors r ₁ , r ₂ , r ₃ ..., counter parts L ₁ , L ₂ , L ₃ ,... between the terminals 14a of r _o and the terminals 16 _-1 , 16 _-2 , . . . 16 _-o of the adjustment resistor on the opposite side and the ground side terminal 14b ，
Counter circuits 18 _-1 , 18 -2 , ₁₈ -3 , 18 -1 , 18 _-2 , 18 -3 , 18 -1 , 18 -2 , 18 -3 , 18 -1 , 18 _-2 , 18 -3 , .
8 _- form o. Note that the counter parts L ₁ , L ₂ ,...,
Although not shown, L _o is an electromagnetic counter.

Next, the effects of the present invention will be explained. When a surge voltage enters the lightning arrester 11 and the lightning arrester 11 discharges, this surge current flows through the nonlinear resistors R ₁ and R ₂
The capacitor C is charged by the voltage generated across the nonlinear resistor _R2 . When charging of the capacitor C is completed, the charge stored in the capacitor C is discharged through the counter device 16. Since the adjustment resistors r ₁ , r ₂ , r ₃ , ..., r _o of this counter section 16 are arranged in descending order of resistance value, the respective counter circuits 18 _-1 , 18 _-2 , 18 _-3 , ..., _18-2 differs in detection current, that is, surge current sensitivity, and the surge current sensitivity increases sequentially. That is, they operate with sequentially larger detection currents, that is, surge current peak values.

Therefore, when the counter circuit _18-3 operates due to the surge current and counts once, the intermediate counter circuits _18-1 and _18-2 also count once each, so that only each counter circuit counts. All the corresponding surge current counts are calculated by subtracting the operated counts of the counter circuits higher than each counter circuit, that is, the counter circuits with high surge current sensitivity. In this way, it is possible to count the number of times the actuator operates with respect to the peak value of the invading surge current, that is, the frequency.

Although not shown in the current detection unit 15,
A current transformer can also be installed in place of the nonlinear resistors R ₁ and R ₂ .

Next, other embodiments of the present invention will be described with reference to the drawings. The same parts as those in FIG. 1 are given the same reference numerals. In FIG. 2, the counter device 16 includes counter portions _{A 1 ,} A ₂ , A ₃ , . . . _{A o corresponding} to the counter portions L _{1 ,} . , A ₂ , A ₃ , ... A _o are normally open relay contacts A _1-a , A _2-a , A _3-a , ... A _oa and normally closed relay contacts A _2-b , A _3-b respectively. , ...A _ob is provided. The auxiliary circuit _20-1 of the counter section _A1 is connected in series with the normally open relay contact _{A1 -a} of the counter section A1 to the other counter sections _A2 ,
……Normally closed relay contact of A _o A _2-b , A _3-b , …, A _ob
It is formed by connecting the normally closed relay contact section 19 _-1 consisting of the above and the counter 21 between the power supply PN. Further, the auxiliary circuit _20-2 of the counter section _A2 is connected in series with the normally open relay contact _{A2 -a} of the counter A2 to the other upper counters _A3 ,...,
It is formed by connecting a normally closed relay contact _part 19 _-2 consisting of normally closed relay contacts A _3-b , A _4-b , . . . , A _ob of A o and a counter 21 in series between the power supply PN. Similarly, each auxiliary circuit 2 of the counter section A ₃ , ..., A _o
0 _-3 ,...20 _-o are the respective normally open relay contacts A _3-a ,
. . . are formed by connecting A _oa , the normally closed relay contact section of the higher order, and the respective counters 21 in series between the power supply PN.

The effects of other embodiments of the present invention configured as described above will be explained. The operation of the current detection section 15 is the same as described above. When the surge current detected by the current detection section 15 enters the counter circuit _18-3 , for example, the normally open contact of the auxiliary circuit _20-3 of the counter section _A3
A _3-a closes. At this time, the counter sections A ₄ , ..., An above this counter section A ₃ are not operating, so the normally closed relay contacts A _{4 -b} , ..., A _ob connected to this auxiliary circuit 20 _-3 remain closed. The current from the power supply PN flows and the counter 21 operates to count once. Also, at this time, the counter circuit 20
The normally closed relay contacts A _{3 -b} of the counter section A ₃ are connected to the lower counter circuits 20 _-1 and 20 _-2 of -3, respectively.
A _3-b opens simultaneously with the operation of counter section A ₃ ,
Since the counter circuits 20 _-1 , 20 _-2 , . . . do not operate, the respective counters 21 and 21 do not operate. In this way, the auxiliary circuits 20 _-1 , 20 _-2 , ...,
20 _-o allows the counter 21 to count only the operations of the relays of the counter circuit that operate in response to the peak value of the surge current. Therefore, there is no need to particularly calculate the frequency as in the first embodiment of the present invention.

[Effect of idea]

As explained above, according to the surge counter device for a lightning arrester of the present invention, it is possible to measure the frequency according to the peak value of the surge current that has entered the lightning arrester.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a surge counter device for a lightning arrester according to one embodiment of the present invention, and FIG. 2 is a circuit diagram of a surge counter device for a lightning arrester according to another embodiment of the present invention. 11...Surge arrester, 11b...Ground side terminal, 13
... Ground, 14a, 14b ... Terminal and ground side terminal, 15 ... Current detection section, 16 ... Counter device, 16 _-1 , 16 _-2 ..., 16 _-o ... Adjustment resistance terminal, 17 ... Surge counter device for lightning arrester. 18
_-1 , 18 _-2 , 18 _-3 , ...18 _-o ... Counter circuit, 19 _-1 , 19 _-2 , ..., 19 _o-1 ... Normally closed relay contact section, 20 _-1 , 20 _-2 ,20 _-3 …,20 _-o …
... Auxiliary circuit, 21 ... Counter, R ₁ , R ₂ ... Non-linear resistor, G ... Protective gap, C ... Capacitor, r ₁ , r ₂ , r ₃ ..., r _o ... Adjustment resistor, L ₁ , L ₂ , L ₃ ,
..., L _o , A ₁ , A ₂ , A ₃ , ..., A _o , ... counter section.

Claims (1)

[Scope of claim for utility model registration] (1) A current detection section is provided in series on the grounding side of the lightning arrester,
In a device in which a discharge counter unit is connected to this current detection unit, a plurality of adjustment resistors are connected to either the system side or the ground side terminal side of this current detection unit in descending order of resistance value from the terminal side. A counter section is connected in series between the terminal of the adjusting resistor opposite to the terminal of each adjusting resistor and the other terminal side of the current detecting section, and each of the adjusting resistors and the adjusting resistor are connected in series. A surge counter device for a lightning arrester, characterized in that an individual counter circuit is formed by the counter section connected to a terminal of a resistor, and discharge counting is performed by the counter circuit according to a detected current. (2) The surge counter device for a lightning arrester according to claim 1, wherein the counter section of each counter circuit operates only as a counter circuit corresponding to the detected current.