DE2342123A1 - Integrated medium voltage cct. breaker - has lower busbar isolator terminals mounted on upper cct. breaker terminal - Google Patents

Abstract

The integrated principle depends on the active parts of the switch assembly being on one unit with only the stationary isolator contacts attached to the busbar and the cable outlet. The busbar isolator hinges on a mounting attached to one end of the circuit breaker. The corresponding outgoing isolator is similarly mounted at the opposite end of the breaker. The stationary contacts are attached to the busbar and cable termination respectively. The isolators rotate on spindles held in bearings typically located in the enclosure walls. A separate spindle is provided for each isolator row.

Description

Izmail Krim-Samhalov

INTEGRATED MEDIUM VOLTAGE CELL

It is known that some current medium voltage cell are in a so-called sheet-metal encapsulated design.

These cells have a retractable switch with the retractable contacts. These contacts play a separating role. That means you have to move the whole switch over. This is the case for the operating staff Solution uncomfortable because the switch is quite heavy. The switch is on the largest part of a cell and can still be moved. Everchin it is better that large and heavy objects are stationary. That means that the switch should be immovable.

The sheet metal encapsulated cells only have the single busbar * However, there are such sheet-metal-encapsulated systems that have double busbars. This plant has a double rail but therefore each outlet must have two switches and two cells. That means that the whole plant doubles Needs space. It is obvious that this solution is very expensive. In addition, the series coupling that has the switch must have at least two Have cells. The Oupplex system, which is not in "back to back" Execution requires the high-voltage connections between two cells that belong to an outlet. This system is even more expensive.

A better solution is the integrated cell. This cell has single, double or triple busbars. »This is possible because the busbars of the same name belong to the various busbar systems and form individual groups. An example: A system has a triple busbar · All three rails have the designation E, d _# h "* R1, R2, 83, lie next to each other so that the system has a space where only the rails R are arranged. This space is about the phase of the same name The same applies to the rails S and T. All busbars S are in the room via phase S of the switch. All busbars T are via phase T of the switch

5Π9809 / Π21 1

achieve because the switch has a transverse position with consideration for the Busbar position has.

The following applies to these cells: The switch connection is also the isolator stop, so that the isolator has no support of its own. This means that the cell has no connecting lines because all the elements are built in. The current transformer uses some conductive parts of the switch or as the primary winding of the separator. Therefore this cell is an integrated cell. The basic solution is shown in Figure 1. It can be seen that the lower connection of the busbar disconnector (k) is built into the upper switch connection (11). The other disconnector connection (1) is built into the busbar (R ^ SiT). The cutting knife (2) is installed directly on the cutting shaft (3). Of course, this shaft must be made of insulation, or made of iron with an insulation coating. The shaft bearings are also installed on the switch connections or on the frame.

The same solution applies to the outlet separator. The lower switch connection (6) is together with the upper disconnector connection (> 12) built-in. The lower isolator connection (9) is in direct connection with the cable termination (10). This cell is because of the better Overview drawn without scaffolding "

A normal current transformer can be placed between <'. Ä on elements (9) and (10). A plug-in current transformer with a pipe for the secondary lines is more suitable for this cell, as shown in Figure 1.0. This converter is my patent application P 23 3 ^ 815 · ¹ + · Figure 2 shows this cell with the isolators switched on. Figure 3 shows the integrated cell with double busbars that lie in a horizontal plane.

Figure * t shows the cross coupling for this system · Figure 5 shows the Line coupling for the single busbar. It is clear that for that Coupling only one cell is enough.

Figure 6 shows that the cell with double bars is not two busbar disconnectors A single disconnector knife is enough for both systems Have operating rod (15). A better solution with the changeover disconnector is picture 7. The knife is back on the shaft. For the design according to Figures 6 and 7, the isolator is in the middle position switched off. In both cases, the rails of system 1 must have insulation.

All cells described can have the same rail on top of each other . 509809/021 1

In picture 8 you can see this cell with double busbars ^ but with the thrust separator. Because of the small decency in switched off The position between the contact pin of the isolator and the mutual safety device must be used. A sliding earth can be built for the integrated cell. This is element (13) on the picture 11 * This rod is completely flat and therefore is suitable for this cell · Another and cheaper solution is the grounding pin. The ieil (1 * 0 on picture 12 is a Guide socket · All three phases each have a socket in one The fourth bushing is installed on the frame. A metal rod ^, which is an accessory for the whole system, is inserted through all four sockets.

It should also be noted that the iBi ^ -ä 9 is a simple possibility

shows building the cell with the triple busbars. It is only the upper part of the cell interesting · The separator is a switchover separator.

Each busbar system has its own horizontal level.

The upper disconnector connection (1) is installed on the side of the rail.

The knife (2) should be more insulated.

If you want to use all "0" axes for the "Off" position, you must the upper system have insulation.

If we only have axis "00" available for "Off", then everyone is allowed Rails be bare.

For all the variants described, the busbars are attached to the partition walls with the help of the bushings.

It is interesting to note from Figure S ₁ how many busbar systems Nj can have an integrated cell. For this consideration we take the length of the isolating knife r and the phase distance a as a prerequisite.

A cell with the changeover disconnector can handle so many busbar systems N have as many connections as the isolators can have on the rails. When you turn the knife, it describes a circle with the circumference U = 2 / Tr. The distance between two phases i.e. between two upper isolator connections (1) must be at least a. This means that you have to divide the entire circumference by a:

N = U / a = 2iT
for r / a = k
do we have:

509809/0211

Because the isolator contact (1) has its own length and because the isolator must have a few positions for "off", you have to divide the above formula by approximately 2 so that we can do in practice Have N = / 7 * k.

That's still a big enough number

For example, if the disconnector knife is 3 times longer than the minimum phase distance, we have N = ZTk = ^ 3 = 9 · The system can have ⁰ 9 systems. Of course one does not need such a system, but that means that the collector box arrangement according to Fig. 9 offers great possibilities.

For k = 1, i.e. a = r, N = ^ ~ k = 3 the system can have triple busbars to have. Bas means that the cutter knife should not, in practice, be as a.

One cannot say anything special about the mechanical fastening of the switch. In any case, the switch should have wheels, so that it can be taken away from time to time to clean off the dust or make a repair.

509809/021 1

Claims (2)

PATENT CLAIMS Integrated medium-voltage cell, characterized in that the lower busbar separator connection (h) is built into the upper switch connection (11), that the upper busbar disconnector connection (1) is built into the busbars (EST), that the upper outgoing disconnector connection (12) is built into the lower switch connection (6) is installed so that the separator ground (2, 7) is installed at the Trermerv; elle (3 »8). 2. Integrated medium voltage cell according to claim 1 with double or Multiple busbars, characterized in that the identical busbars (R1, R2, R3), (S1, S2, S3), (T1, T2, T3) the different systems belong side by side are arranged that you have a switch disconnector for the busbar disconnector. 500809/0211