JPS5878331A - Breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 1) Technical Field of the Invention The present invention relates to a circuit breaker with an improved arrangement of switching overvoltage suppressing resistors.

2) Conventional technology and its problems In order to suppress switching overvoltage of circuit breaker, especially closing overvoltage when closing the breaker, a resistor closing method is generally used in which a resistor is closed in advance of the main contact. It is used in the power transmission system. In this case, a link mechanism mechanically connected to the main contact is generally employed as the contact for opening and closing the closing resistor.

Also, breaker equipped with closing resistor, especially SF.

Gas blown circuit breakers have recently seen remarkable improvements in their breaker performance.
The number of break points has been significantly reduced, and even in 500kV systems, two-point breakers have appeared.

On the other hand, the value of the closing resistor that suppresses the closing overvoltage is determined by the insulation coordination level of the power transmission system, the system voltage, the surge impedance of the system, and the length of the power transmission line, and is not affected much by the short circuit capacity.

Therefore, even if the breaking performance is improved and the number of breaking points is significantly reduced as described above, the value of the closing resistor and its responsibilities remain unchanged from the current situation. However, a significant reduction in the number of breaker points means a corresponding reduction in the number of closing resistor switching contacts, and a significant reduction in the number of breaker connections to which these are installed. It becomes difficult to mount a resistor that fulfills this function in a reduced space.

In addition, circuit breakers that are connected to systems with low surge impedance, such as cable systems and pipeline air busbars, are
Conventionally, it was common not to have this resistor device because it has high-speed reclosing responsibility.
In recent years, with the increase in power transmission capacity, the charging capacity of these systems has also increased, and because of their low surge impedance, even when normal ground voltage is applied, overvoltage is generated in the system, and the value or insulation coordination level may be exceeded. There may be cases where it exceeds
It's becoming a problem. In such systems, the value of the resistor inserted when the circuit breaker is turned on is lower than that used in conventional overhead line systems due to its low surge impedance. This is an even more laudable problem in the Rusha disconnector.

3) Purpose of the Invention The present invention was made in consideration of the above points, and its purpose is to facilitate the selection of the resistance value of a resistor and to install a large-capacity resistor with a low resistance value. It is an object of the present invention to provide a reliable breaker that can reduce the resistance value at the initial stage of turning on as time passes.

4) Structure of the invention ゛In order to achieve the object of the present invention, a plurality of disk-shaped resistor elements are stacked on at least the movable side resistance contact of the movable side resistance contact or the fixed side resistance contact of the resistance contact part. A plurality of resistor units formed by the above-mentioned movable side resistance contacts are disposed separately, and the plurality of resistor units are disposed in series, in parallel, or connected in series and parallel, and the plurality of resistors of the movable side resistance contact The body unit is configured to change the connection according to the input operation.

5) Examples of the invention The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, a multi-point breaker, for example a two-point breaker, connects a breaker unit m, (1) via a center piece (2), and connects this center piece (2) to an insulating tube (3). It is supported in a tank (5) together with an insulating gas (4) such as SF or gas. Also, both breaker units (11, (11 are conductors (61), (bushings (7) inserted through the conductors (61) connected to their respective ends).

(7) to the outside of the tank (5), and the two breaker units (11, (+1) are connected to an externally provided operating device (8) for opening and closing operations.

In FIG. 2, the breaker unit (1) consists of a main contact breaker (II), a resistance contact part +rl connected in parallel, and a coupling mechanism part (131) connected to the movable sides of both of them.

The main contact breaker part has a fixed side main contact (15), a movable side main contact part, and a buffer part 0? adjacent to the movable side main contact part. ), and the fixed side main contact 05) is supported by the buffer part (171) via the insulating cylinder side, and the buffer part an is attached to the center piece (2) (not shown).
A voltage dividing capacitor a9 is provided on the outer periphery of the circuit 8.

The resistance contact portion (11) includes a fixed resistance contact (2) and a movable resistance contact c! D, the movable resistance contact Qυ is supported by the case +221 connected to the center piece (2) (not shown), and the fixed resistance contact - is supported by the case (221) via the insulating tube c2. .

The main contact breaker (the movable main contact 06 of 11) is connected to the link mechanism part c311 by moving the electrode rod (2) together with the buffer cylinder (4) of the buffer part θ force. Also, the movable contact Q of the movable resistance contact 011 of the resistance contact part (old)
9 is connected to the link mechanism section (2&) via an insulating rod.

Both link mechanism parts (281 and c31) are connected via a connecting shaft shown by a dashed-dotted line to form a connecting mechanism part a~, and this connecting mechanism part Q31 is connected to an operating device ( 8). The fixed side main contact 09 and the fixed side resistance contact - are connected by a connector (331).

The fixed side resistance contact of the resistance contact (old) is the shield c3ω
is pressed by a wipe spring (T) consisting of a compression spring, and the fixed side resistance contact mounting member (2 (L)
It is formed by accommodating a fixed contact C (η) which is slidably attached via a contactor (20b) approximately in the center of a).

As shown in Fig. 3, the movable resistance contact clD is made by laminating a plurality of disc-shaped resistor elements (4(la)) each having a hollow portion to form a resistor unit l-(41), (4″IJ). The resistor unit (4I) is connected to the connection plate (4I) at each end.
3. Insulating members (411, (4Ei) are provided via (451). Furthermore, a connection flange (4η, shield (4) is provided at the end of one insulating member (461), and the other insulating member (4fn is a case). It is in contact with the C force.Then, the connecting plate (4
and the connecting flange (47) are each formed in an annular shape,
It is also in contact with the resistor unit (4 sides). Also, the connection flange f471 is connected to the movable contact (2) via the contact (47a).
The connection is made through the connecting conductor 61 which is inserted into the hollow part of the insulating member (4(0) and the hollow part of the resistor element (40a) and the insulating tube (49) inserted into the hollow part of the resistor element (40a). Board (451# is connected.

On the other hand, one end of the resistor unit (43 is in contact with the case 1221, and the other end is provided with a connecting plate (43, insulating member f46), a connecting 7 flange (47), and a shield (481) in this order. Resistor unit) ( 41) (Although a plurality of each Q is provided, in this embodiment, two each are provided as shown in Figure 4.

and the respective resistor units) (41), (43 are insulating studs (51) ζ as shown in Fig. (Tightening is supported between the 4 barrels and the case (A).

The movable contact C!ll, which is connected to the link mechanism part C81 via the insulating rod, is connected to the fixed contact by the surface insulating part 61 (the contact rod (29a) on the 3η side and the insulating rod (7)
The side contact rod (29b) is provided with an insulating section at the surface.

However, both contact rods (29a) and (29b) are connected via a rod connection portion (29c) shown by a dotted line.

That is, as shown in FIG. 4, the rod connection part (29c)
The periphery of the contact rods (29a') and (29b) are optically shielded by an insulating member (53a), and the surface thereof is the same as that of both contact rods (29a') and (29b). Also, this movable contact c! A dressing toucher (43a) that slides on the surface of the mouth is disposed on the connecting plate (inner peripheral surface of the mouth).

Then, the two resistor units (41) are connected to the connection plate (4 (
.

(451 is connected in parallel with the resistor unit i (411'), and one end of the two resistor unit i (411'
, 4121 is a connection plate...Thus, □ are connected in series.

In addition, the position of the surface insulation part c5 provided on the movable contact QI is located at the position where the movable contact (c) is driven to close and the contact rod (2
At the time when the tip of the connecting plate (43) comes into contact with the fixed contact (3D), the contact (43a) of the connecting plate (43) contacts the surface insulating portion 6;
(see Figure 5), and a movable contact -
is driven, and in the process where the fixed contact (3n) compresses the wipe spring (ball;) and moves to the left in the figure, the contact (43
The surface insulation part 5 is moved to the left side of a), and the contact (43
a') is removed from the surface insulation part 6J (see Fig. 6),
Furthermore, the movable contact (2i11) is located between the broken contact (47a) and the contact (43a) when the closing operation of the movable contact (2i11 is completed), and this solid contact (27
A17 is selected and positioned so as not to come into contact with either a) or (43a). (See FIG. 7) Next, the operation and effect of the breaker of the present invention will be explained. When a closing command is given to the operating device (8), the driving force is applied to the coupling mechanism section (131) via an insulated operating rod (not shown).
As a result, the main contact breaker OQ starts the closing operation, and at the same time, the connection shaft (3
) The driving force is transmitted to the link mechanism section (28+) through the link mechanism section (c).
The movable resistance contact υ starts the closing operation.

At this time, since the respective electrode arrangements are configured such that the closing time of the movable contact ta is shorter than the closing time of the main contact breaker section -, the main contact breaker section QQ and the resistive contact section 1 perform the closing operation at the same time. Even when starting, the movable contactor closes first, and as described below, the resistor unit l-(41),
(The way in which 4 is inserted changes, and after a certain period of time, the main contact breaker - is closed, and the resistor unit +41 is short-circuited. U3 is short-circuited and the closing operation is completed.

Furthermore, the closing operation of the movable contact (21) will be explained in detail.The movable contact (to) is driven from the position shown in FIG. 3 to the left side in the figure, and as shown in FIG. When the rod (29a) comes into contact, the contact (43a) of the connection plate (43) moves onto the surface insulating portion 5■.Therefore, the movable contact (c) moves between the contact 811 (47a) and the connection plate (43, connection conductor 60), connection plate (2 resistor units +411 connected in parallel via 451), connection plate (
1:l Therefore, two parallel resistor units (4 and 4) are inserted between the case (221) and the case (221) and abut against the fixed contact CD.

Furthermore, when the movable contactor is driven to the left in the drawing, the fixed contact c17'l is maintained in contact with the movable contact by the wipe springs C and Iil, as shown in FIG. Then, since it moves away from the surface insulation part (5 broken contact (43a) and moves to the side 1j shown in the figure, the two resistor units connected in parallel (
4υ is the contact rod (29a) that is in contact with the contactor (47a), (43a), and the rod connection part (29c)
, are short-circuited by the contact rod (29b). That is, only two parallel resistor units (4 resistors) are connected between the connecting plate (43) and the case Q via the contactor (43a).

Furthermore, when the movable contact (2) is driven and the stroke ends, the surface insulation part e'i:11 is located between the contacts (47a) and (43a) and is not in contact with any of them, as shown in FIG. Therefore, as described above, the resistor unit (41) is short-circuited and only the resistor unit (421) is inserted.

When the movable contactor completes its stroke in this way, after a very short period of time, the main contact breaker (II) closes,
Resistor unit (4) is short-circuited to complete the closing operation.

Moreover, the shutoff operation is performed through the reverse process of the closing operation. In this case, the fixed side resistance contact (2
G fixed contact c3? ) is wiped according to the wipe spring value j, but the opening speeds of the movable main contact Oe of the main contact breaker 0 [ and the movable resistance contact C/11 of the resistance contact CII+ are the same speed and fast, so it is fixed. The contact C17> cannot follow the movable contact (to), and the resistive contact Qll opens first,
Since the interpole insulation is restored prior to the main contact breaker OI, current interruption is performed by the main contact breaker OI.

In this way, during the closing operation, the resistance contact mQll is closed prior to the main contact breaker 0, and the closing resistance value can be selected by connecting the resistor units (41) and (421).

Also, in the initial stage of application, two resistor units are connected in parallel.

(Inserting four resistors in series and after a certain period of time, the resistor unit) (41) can be short-circuited and the closing characteristics can be improved by two-stage input of the closing resistors, such as connecting only the resistor unit (421). In addition, the resistor unit) (411
(By connecting 421 in series, the creepage insulation distance is increased and the cooling effect is also improved.Furthermore, the resistor element (40a) is manufactured because it is small.) - Yield is improved, which reduces costs and improves quality. do.

6) Other embodiments of the invention In the above-mentioned embodiments, the movable 11 resistance contact (21)
The capacitance of the resistor can be further increased by incorporating a resistor 6ω into the fixed resistance contact (2
ω forms the current path 51 shown by the dotted line, and connects the resistor unit (411 and (42) of the above-mentioned movable resistance contact CD.
It is inserted in series with 1.

7) As described in detail of the invention, a plurality of resistor units in which a plurality of resistor elements are laminated are disposed at least on the movable resistance contact of the resistance contact portion, and these plurality of resistor units are divided into approximately two parts to form first and second resistor units connected in parallel, and the first and second resistor units are connected in series at the beginning of the closing operation by the action of the surface insulation part provided on the movable contact. By inserting the resistor into the circuit breaker, and after a certain period of time, inserting the resistor in two steps at a reduced value only in the second resistor unit, it is easy to select the resistance value of the resistor, and it can be stably inserted into the limited internal space of the circuit breaker. Moreover, it is possible to provide a breaker that can house a reliable resistor, and has excellent closing characteristics that can be closed in two stages.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a partially cutaway side view, FIG. 2 is a sectional view of the breaker unit, and FIG. 3 is a resistance contact in an open state. Sectional view of part 4
The figure is a sectional view taken along the line IV-mV in FIG. 3, FIGS. 5 to 7 are sectional views of the resistance contact part during and in the closing operation, respectively, and FIG. 8 shows another embodiment of the present invention. FIG. (1)...Breaking unit unit, (2)...Center piece, (10)...Main contact breaking part, old)...Resistance contact part, 031...Connection mechanism part, 0 (T)... Fixed side main contact, (161...Movable side main contact, (171...Buffer part, αl)...Fixed side resistance contact, C1) - Movable side resistance contact, (221...Case, c! Tao ...Insulating tube, (!
fil・buffer cylinder, (27)・electrode rod,
(28+, C1l+... link mechanism section, C'll
・・Movable contact, (29a), (29b) ・・Contact rod, (29c)・・Rod connection part, α・Insulation (1 do, C321・・Connection shaft, c (bleed・・Connector, 3 One...Shield, (3)...Wipe spring, (37!...
Fixed contact, (40a)...Resistor element, (411, (
421...Resistance unit, (4 rows, (451...
Connection plate, (43a)...Contact, (471...Connection flange, (Insulation...Shield, (4I...-Insulation tube, 6
(G・Connection conductor, ell)...Insulation stud, l! '1
3)...Surface insulation part, (53a)...Insulating member, 6...-Resistor agent Benbishi Inoue--Male

Claims (2)

[Claims] (1) A breaker configured by connecting a resistor contact section consisting of a resistor that suppresses the switching overvoltage of the breaker and a resistor contact that switches on and off the current flowing through this resistor in parallel with the main contact breaker section. In a breaker formed by connecting two units in series, at least the movable resistance contact of the resistance contact portion,
A plurality of resistor units formed by stacking a plurality of disc-shaped resistor elements are arranged in a pot, and the plurality of resistor units are electrically connected and disposed, and the movable A circuit breaker characterized in that the connection of the plurality of resistor units is changed in accordance with the closing operation of the side resistance contact. (2) A plurality of resistor units are arranged side by side between the shield of the movable resistance contact and the case, and the plurality of resistor units are roughly divided into two and connected in parallel, respectively. The first resistor unit is insulated from the case side via the shield-side connection plate and a connecting conductor that is inserted through the first resistor unit in an insulated manner. The second resistor unit is connected to the second resistor unit by a connection plate that is connected to the other end of the first resistor unit through the shield and the insulating member. and the first
and a rod-shaped movable contact that can be freely driven between the second resistor unit and a first contact of the shield and a second contact disposed inside the hollow part of the connection plate,
The movable contact is divided into first and second contact rods that are electrically connected to each other through a surface insulating portion provided on the movable contact, and the first contact rod of the movable contact When the contact rod contacts the fixed contact, the second contact is located on the surface insulation part, and the first and second resistor units are inserted in series, and as the closing stroke progresses, A patent in which the surface insulating part and the second contact are separated, the first and second contacts are short-circuited via the movable rod, and only the second resistor unit is inserted. A circuit breaker according to claim 1.