JPS6185016A - On-load tap changer - 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] [Industrial Application Field] This invention is a next-load tap changer for a vacuum switch 'killj', and is particularly concerned with preventing fatal damage to a transformer during short supply between taps. It is.

[Conventional technology]

Figure '$8 is a circuit diagram showing a conventional load tap cutting device shown in, for example, Japanese Patent Application Laid-Open No. 55-110015. , 12+
t:ll is the tap selection of the tap selector that selects the above-mentioned adjustment winding (the even-numbered tap on 11 and the e-th tap), (4) is the even-numbered side of the switching switch connected to the above tap selection (2) The input terminal of 151 is the input terminal of the odd number side of the 9JM switch connected to the above-mentioned option (3), 161 (7
1 is the current-carrying fixed contact connected to the valley input terminal (41 (5)), (8) is the valley pass area fixed contact t61 +
(9) is the output terminal of the switching switch, and (uO) is the current-carrying fixed contact that selectively engages with 7l (61F).
? (VSz) (781) is a vacuum switch, R
is a current limiting resistor. (In short, the rated load current of the vane pressure regulator or its overload 'Vi flow can be normally passed continuously, but the fuse is disconnected or disconnected in case of a dog-eared flow such as a tap-to-tap addition.) With a bath cutter consisting of four thin wires, etc., remove the power supply between the taps according to Figure 3, which is connected between the input terminal (5) and the current-carrying fixed contact (7). If the vacuum switch (VBK) opens as shown in Figure 3 (1) l, if the vacuum switch (VS) fails to cut off the load 1 flow for some reason, the
At the zero stage, a short circuit between the taps (the path shown by the broken line in the figure) occurs via a space arc, and an excessive current flows through the above process, causing the fuse to melt and the short circuit between the taps to occur. is removed. When the fault current is removed, as shown in Figure 3
(R) (VSs) (Supplied via the electrical circuit consisting of 91. After a while, when the true switch (VS 凰) is closed as shown in Fig. 8+el, the negative 'ff'Ka
+2l -+4l (61LSI (VB t )
, -+9l OM rllr t A, and the inter-tap circulation area flow (il) flows through the circuit shown by the broken line in the figure. Next, in Fig. 3 (f+ state), if the vacuum switch (VS) is open T1, only the load region flow (il) will be supplied from the even-numbered tap, and the tap switching will be completed. This shows the reverse switching, that is, vJ switching from even taps to odd taps.As shown in Figure 4 (tel), the load area current (il)' is supplied from the even taps through the vacuum switch (VS+) t''. If you want to switch to an odd number of taps when
As shown in b+, the vacuum switch (VS, ) is initially opened. At this time, the load current (il) is indicated by the vertical line 9'-#
I! rft, and the inter-tap circulation (IC) flows through the next path shown by the broken line in the diagram. As shown in Figure 1ot, the vacuum switch (VS Attempts are made to cut off the Guectre sum of the current (11) and the circulating 4 currents (1C).At this time, if for some reason this 14Ed fails to cut off, at the next stage, that is, 'g!!J4 Figure 4 As shown in the same figure, additional power is generated between the taps via a space arc, and an excessive current flows through the path indicated by the broken line in the figure. ) is arrested and removed to 4 short taps.

Next, as shown in the diagram, unlike the vacuum switch (78 is closed and the tap switching operation is completed @ box), the fusing element (l) is changed from odd numbered taps to even numbered taps.
The load area current (il) cannot be supplied through the full switch (vsx) k, which is fused, and the
As shown in , the load area current (il) is +3l-(51-ke)-(V'S*) L91 via the current limiting resistor (R).
As long as the heat capacity of the Han-style resistor Maro, which is energized through the current path, is sufficient, there is no need to worry about immediately stopping the converter, and it is necessary to cut the load to the pond system. You can perform various operations.

[Problem that the invention seeks to solve]

In the conventional load-time tap switching device described above, when the fusing element blows out due to the short distance between the taps, the noble current is supplied via the current-limiting resistor, so the longer it takes to switch to the load reservoir system, the longer it takes. The problem was that the heat capacity of the resistor had to be reduced by 70%.

This issue 811 was made to solve such problems.
With this, even if the fusing element is gW+, it can supply 4 loads without going through a weapon.
[Means for solving the problem] The load-time tarapuri device according to the present invention provides a passing-only contact in parallel with the circuit including the resistor, and connects it in parallel to the circuit including the resistor. It is designed to allow the load range to flow through the dedicated contact point.

[Effect]

In this invention, four load currents are passed through a contact dedicated to the nine-way area, which is connected in parallel with the circuit including the resistor, thereby suppressing an increase in the heat capacity of the resistor.

〔Example〕

FIG. 1 is a circuit diagram showing one embodiment of the present invention. Figure V
Kooite, Ill ~(91, (ls, vs, s)
vss is the same as the conventional one. (6) is a constant blooming point for current only connected to the odd side input terminal (5), Kasumi is a fixed contact for current only connected to the even side input terminal I41 of the cutout enclosure 6, and H is a fixed contact for current only connected to the even side input terminal I41 of the cutout enclosure 6. It is connected to the output terminal (9), and the other end is selectively connected to the fixed aging point (6) α4 for 4% current.It operates as shown in Figure 2. Showing sea dance.

The situation when the viewing switch vsl fails to shut off is shown in Figure 3-10.
14 is the same as 6.

In the circuit of FIG. 3 la, the heat capacity of the current limiting resistor R was irrelevant as a protective feature when switching from odd taps to even taps. The same applies to Figure #I1. For convenience, the operation in FIG. 1 will be explained only regarding the inter-tap standard when switching from even-numbered taps to odd-numbered taps. The above gJ master is achieved by proceeding from the right to the left as shown in the seadance diagram of FIG. @ In figure 8, ■
In the device marked , the nitrogen switch VB is opened, and the shell
! The flow and circulation ita are cut off by Guektor Wakura, but at this time, if vsI causes a cutoff failure t'', at the position marked by ■, +3J -tal- (1 Lee (7) - 2 arc te
1-141- (!J's '1 path, an excessive current flows due to the short circuit between the taps. Therefore, the fuse 11) is blown and the fault 4 current is eliminated. Load of main pressure device d a t
l 131 +5J R-V as (becomes to flow through SIJ's xiI & 1- further aaC
*If the movable bond point 1141 comes into contact with the energizing fixed point 4, the load current will be I:1l-I5j'J4u-
(The current is commutated to the electric path consisting of 91, and the tap switching is completed.

Since the electric circuit consisting of the above iat - +6J w D4 [9] is configured to have a real delay transmission force t, even the previous work of switchover can be locked by adopting the configuration Kt- shown in Fig. 1. If this is done, there will be no change in supplying the load current fLt.The above example was explained in which the fuse (II) t-odd number side input sperm (61) is connected between the energized fixed contact (7), Generation V
The same effect can be obtained even if it is connected between the V even number side input terminal (4) and the current-carrying fixed contact (61), or even if it is connected to both.

〔Effect of the invention〕

As explained above, this invention has the effect of preventing an increase in the heat capacity of the resistor by providing a dedicated contact point in parallel with the circuit that includes the resistor, thereby allowing the load current to flow through the dedicated contact point. lol 0

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is an operational sequence diagram of FIG. The figure is the third
FIG. 2 is an explanatory diagram illustrating the operation at the time of reverse direction switching in the circuit diagram shown in the figure. In the figure, 11) is the voltage generator winding, (2) is an even tap, +3J is an odd tap, 161 (71 is a current-carrying fixed contact, (8) is a current-carrying fixed contact, (9) is an output terminal,
ll) is a new element, - is a fixed contact exclusively for energizing, and α is a movable contact exclusively for energizing. -In addition, the same symbol in each factor indicates the same or equivalent part.

Claims (1)

[Claims] (1) first and second tap options selectively connected to the first and second taps of the transformer, a first energized fixed contact connected to the first tap options; a fusing element that is connected to the tap option and melts with a predetermined current; a second energized fixed contact that is connected to the second option via the fusing element; a second energized fixed contact that is selectively joined to both of the energized fixed contacts; a first energizing movable contact, an output terminal for transmitting a load current, a first vacuum switch connected between the output terminal and the first energizing movable contact, connected in series with each other and the second option; A resistor and a second vacuum switch are connected between the output terminal and the third and fourth energizing fixed contacts, which are connected to each of the options, and the third and fourth energizing contacts are connected to the output terminal. a second energizing-only movable contact that is selectively joined to the energizing-only fixed contact; and between the first tap option and the first energizing fixed contact, and between the second tap option and the An on-load tap switching device in which a fusing element that melts at a predetermined current is inserted and connected to at least one of the second current-carrying fixed contacts.