CN2280376Y - Distribution transformer and switch combination arrangement with its three phases not of interference - Google Patents

Abstract

The utility model relates to a three-phrase distribution transformer and switch combination device without interference, which is provided with a transformer core with a three-phase and five-column magnetic path structure. Three-phrase high-voltage coils and low-voltage coils are respectively wound on three core columns which are arranged in the middle of the transformer core; the wiring method of the low-voltage coil is in a Y< O > method. A high-voltage fuse is connected in series on each phase high-voltage coil; the high-voltage fuse is separately connected with a three-phase high-voltage coil to form a three-phase high voltage phase arm; the wiring mode of high voltage side is used high voltage phase arm as a unit and in a delta shape. The utility model can be used in a system that a middle point is not connected with ground or a system the middle point passes through arc-extinguishing coils or a system that a small resistor is connected with ground or a system that the middle point is directly connected with ground; fault phases do not interfere with other phases to supply electric power normally. The utility model has the advantages of small size, small land occupation and easy maintenance.

Description

Three do not interfere with or disturb each other mutually distribution transformer, switch combination units

The utility model belongs to field of electrical equipment.

At present, China's power distribution cabinet uses distribution transformer, high voltage load switch, tap changer, high-tension fuse (or circuit breaker) of three-phase three-column Δ/Y0 mode of connection etc. all to be contained in the outside of transformer can more, volume is big, and occupation of land is many, and maintenance workload is also big.The U.S. then generally uses the integrated form power distribution cabinet of three-phase and five-pole Y0/Y0 mode of connection distribution transformer, it is the inside that the main body of devices such as above-mentioned high voltage load switch, tap changer, high-tension fuse all is placed on the transformer can, volume is much smaller, takes up an area of to lack, and maintenance workload is little.But its mode of connection is the outside that high-tension fuse is connected on high-tension coil, and its shortcoming is to use in the earth-free system of mid point.Because, in the earth-free system of mid point, no matter transformer is by the Y/Y0 wiring, when still pressing Δ/Y0 wiring, when a phase high-tension fuse fuses, other two-phase is in far below rated voltage outwards powers, this not only influences power supply quality, also may cause user's electric equipment to be damaged because of moving under the mistake low-voltage.At present, the way that solves in China is one fault to be arranged mutually, and the people is disconnected for three-phase is jumped simultaneously.This obviously is unreasonable way.

The purpose of this utility model, it is the composite set that proposes a kind of distribution transformer, switch, no matter its distribution transformer is used in neutral earthing still is the earth-free electric power system of mid point, can both be mutually or two-phase when breaking down high-tension fuse fusing one, guarantee not influence the normal power supply of other each phase, have only fault to be in complete off-position mutually, promptly become a kind of three distribution transformer, the switch combination units of not interfering with or disturb each other mutually.

The utility model has the advantages that: can be in the earth-free system of mid point, or mid point is through the system of arc suppression coil or low resistance grounding, and general in the straightforward grounding system of mid point, can both accomplish that fault do not disturb " not interfering with or disturb each other mutually " requirement of other phase normal power supply mutually; Volume is little, take up an area of less, easy care.

Design of the present utility model is: seal in the shell (2) at the honey with lead-out wire sleeve pipe (1), iron core (3) is housed, coil (W), high-tension fuse main body (R), high voltage load switch main body (K1), tap changer main body (K2) and filling insulation (4).Its operating mechanism (5) and monitoring, controlling organization and low tension switch all are contained on the same outer panel of housing.The iron core of its transformer (3) is five post magnetic structures, on three stem stems of centre, be wound with A respectively, B, the high-tension coil WA1 of C three-phase, WB1, WC1 and low-voltage coil WA2, WB2, WC2, wherein the mode of connection of low-voltage coil is the Y0 wiring, be three non-polar end x of low-voltage coil, y, the z short circuit is also drawn neutral point n, by a, and b, c, four end points outputs of n become the Y0 mode of connection, and present design is characterised in that: serial connection high-tension fuse RA on every phase high-tension coil, RB, RC is respectively with three-phase high-voltage coil WA1, WB1, WC1 constitutes three-phase ' high pressure phase arm ' A ' X arm, B ' Y arm, C ' Z arm, the on high-tension side mode of connection is to be the unit with ' high pressure phase arm ', is connected into Δ shape mode, by A ', B ', three end points of C are made the high voltage input.

Existing power distribution network mostly is the mid point isolated neutral system in China, generally uses distribution transformer to be Δ/Y0 mode of connection, and promptly the high-tension coil mode of connection is triangle (Δ) connection, and that Δ/Y0 connection has is multiple, Δ/Y0-11 for example, Δ/Y0-1, Δ/Y0-5, Δ/Y0-7 etc.At present, the Chang Youxuan Δ of China/Y0-11 mode of connection, it is as follows that it connects order: A ' connects Z; B ' connects X; C ' connects Y, makes the high voltage input by A ', B ', three end points of C '.

For breaking capacity and the ampere-time characteristic that improves high-tension fuse, with the high-tension fuse series connection of the high-tension fuse in each ' high pressure phase arm ' with two different qualities, one of them is the breaking current fuse, and another is the overload current fuse.

Description of drawings:

Fig. 1 is used for three of mid point isolated neutral system do not interfere with or disturb each other mutually distribution transformer, switch combination unit theory structure schematic diagram;

String has the key wiring diagram of two high-tension fuses among Fig. 2, ' high pressure phase arm ',

A. be serially connected in an end of high-tension coil;

B. be serially connected in the two ends of high-tension coil respectively;

Among the figure:

(1)---lead-out wire sleeve pipe

(2)---can

(3)---iron core

(4)---fill and insulate

(5)---arc suppression coil terminals

WA1, WB1, WC1---three-phase high-voltage coil

WA2, WB2, WC2---three-phase low-voltage coil

RA, RB, RC---high-tension fuse

RA1, AB1, RC1---breaking current fuse

RA2, RB2, RC2---overload fuse

K1---three-phase high-voltage on-load switch

The K2---tap changer

The utility model is described in further detail with following embodiment.

Embodiment 1: be do not interfere with or disturb each other mutually distribution transformer, the switch combination unit that is used for the mid point isolated neutral system, as shown in Figure 1, it has a can (2) with high and low pressure lead-out wire sleeve pipe (1), its transformer core (3) is the three-phase and five-pole magnetic structure, its low-voltage coil WA2, WB2, the corresponding end of WC2 is xa, yb, zc, with x, y, the z short circuit is also drawn n end and is earth terminal, be that wiring is the y0 mode, by a, b, c, n four ends are exported through low pressure extraction tube (1); The wiring of high-tension coil is shown in Fig. 2 a, two high-tension fuses of inlet wire one end serial connection at WA1, one is the bigger breaking current fuse RA1 of volume, and another is that the overload fuse RA2 with better inverse time lag ampere-time characteristic constitutes A phase ' high pressure phase arm ' A ' X.Equally, also be connected in series two high-tension fuse RB1 at inlet wire one end of WB1 and WC1, RB2 and RC1, RC2 constitutes B phase C phase ' high pressure phase arm ' B ' Y and C ' Z, and three ' high pressure phase arms ' are done the connection of following order: A ' meets Z; B ' meets X; C ' meets Y, as the high voltage end of incoming cables, is connected to A, B, C high voltage link end that the lead-out wire sleeve pipe (1) of high pressure locate through high voltage load switch K1 by A ', B ', C ', is connected to the 10KV high voltage transmission line again.The mode of connection of this transformer is the mode of connection of the most normal preferred Δ/Y0-11, and low pressure is a, b, c, the n four ends output of three-phase and four-line 220V phase voltage through lead-out wire sleeve pipe (1).

In embodiment 1, my late father's vouching phase fault situation.If high pressure A phase fuse RA1 fusing, this moment, high-tension coil WA1 lost exciting current, still obtain normal rating voltage and perfect phase WB1, WC1 from three phase mains, its corresponding magnetic flux Φ b, Φ c become the loop from two side column magnetic circuits respectively, because the low-voltage coil WA2 of A phase is connected to load impedance, so the synthetic magnetic flux of Φ b, Φ c is difficult to reflux from A phase magnetic post, so the induced voltage on the WA2 is very little.This shows, under the situation of RA fuse blows, the voltage of low pressure three-phase and four-line output, Ua0 is bordering on zero, and Ub0, Uc0 power under rated voltage 220v fully.Examine the situation of phase to phase fault again, if high pressure A phase B phase fuse RA, RB fusing, this moment, high-tension coil WA1 and WB1 lost exciting current, still obtain normal rating voltage and perfect phase high-tension coil WC1 from three phase mains, its corresponding magnetic flux Φ c forms the loop from two side column magnetic circuits, because low-voltage coil WA1, the WA2 of A phase B phase are connected to load impedance, so the magnetic flux of Φ c is difficult to from the backflow of A phase B phase magnetic post, so the induced voltage on WA2, the WB2 is all very little.This shows, under the situation of RA, RB fusing, the voltage of low pressure three-phase and four-line output, all near zero, Uc0 powers under normal rating voltage 220v fully for Ua0, Ub0.

Embodiment 2: Fig. 2 b is two high-tension fuse RA1, RA2; RB1, RB2; RC1, RC2 are connected on the two ends of high-tension coil WA1, WB1, WC1 respectively.RA1 wherein, RB1, RC1 are the breaking current fuses, and RA2, RB2, RC2 are the overload fuses, and do not interfere with or disturb each other situation and embodiment 1 of other structure and fault is identical.

Claims (3)

1. three distribution transformers of not interfering with or disturb each other mutually, switch combination unit, it is in a can with lead-out wire sleeve pipe, iron core is housed, coil and high-tension fuse, high voltage load switch, the main body of tap changer and filling insulation, its operation, monitoring, controlling organization and low tension switch all are contained on the same outer panel of housing, its iron core is the magnetic structure of five posts, be wound with A respectively on three middle stem stems, B, the high-tension coil WA1 of C three-phase, WB1, WC1 and low-voltage coil WA2, WB2, WC2, the mode of connection of coil has the Y0/Y0 mode, it is characterized in that: wherein the wiring of low-voltage coil is the Y0 mode, by a, b, c, four end points outputs of n, and on every phase high-tension coil, be connected in series high-tension fuse RA, RB, RC is respectively with three-phase high-voltage coil WA1, WB1, WC1 constitutes three-phase ' high pressure phase arm ' A ' X arm, B ' Y arm, C ' Z arm, the on high-tension side mode of connection is to be the unit with ' high pressure phase arm ', is connected into Δ shape, by A ', B ', three end points of C ' are as the high voltage input.

2. as claimed in claim 1 three do not interfere with or disturb each other mutually distribution transformer, switch combination units, it is characterized in that: its ' high pressure phase arm ' mode of connection is triangle (Δ) connection, optimal selection is Δ/Y0-11 mode, it is as follows that it connects order: A ' connects Z, B ' and connects even Y of X, C ', makes the high voltage input by A ', B ', three end points of C '.

3. as claimed in claim 1 or 2 three do not interfere with or disturb each other mutually distribution transformer, switch combination units, it is characterized in that: the high-tension fuse in each ' high pressure phase arm ', be two strings high-tension fuses therein, one of them is the breaking current fuse, and another is the overload current fuse.

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