CN215183478U - Distribution transformer - Google Patents
Distribution transformer Download PDFInfo
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- CN215183478U CN215183478U CN202120508280.2U CN202120508280U CN215183478U CN 215183478 U CN215183478 U CN 215183478U CN 202120508280 U CN202120508280 U CN 202120508280U CN 215183478 U CN215183478 U CN 215183478U
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Abstract
The utility model discloses a distribution transformer, which comprises an oil tank, a transformer body assembly and a protection assembly, wherein the transformer body assembly comprises a triangular three-dimensional wound core, a high-voltage coil and a low-voltage coil, and the high-voltage coil and the low-voltage coil are sleeved on the triangular three-dimensional wound core; the protection assembly comprises a high-voltage fuse and a low-voltage circuit breaker, wherein the high-voltage fuse is connected between the high-voltage coil and the high-voltage transmission line and used for cutting off the connection between the high-voltage coil and the high-voltage transmission line when the distribution transformer is in short circuit; and the low-voltage circuit breaker is connected between the low-voltage coil and a low-voltage outlet end of the distribution transformer and is used for cutting off the connection between the low-voltage coil and the low-voltage outlet end when the distribution transformer is overloaded and has a secondary short circuit. The utility model discloses distribution transformer has work such as breaking current, overload protection, short-circuit fault protection, can break off distribution transformer and transmission line when taking place faults such as short circuit, overload, can improve distribution transformer's security performance, ensures distribution safety.
Description
Technical Field
The utility model belongs to the transformer field, concretely relates to distribution transformer.
Background
At present, a rural power grid and an urban low-voltage distribution network 10kV distribution area are generally composed of units such as a drop-out fuse, a lightning arrester, a transformer body, a transformer comprehensive power distribution cabinet (JP cabinet), and matching accessories. Moreover, the units are independently arranged, so that more equipment needs to be installed on site, more accessories such as angle iron, cross arms, hoops and iron pieces are used, more exposed parts are arranged on the two sides of high and low voltages, the insulation level is low, the installation and debugging time is long, more construction process control points are used, faults and potential safety hazards are more, the tripping rate of a line is easily influenced, and the fault rate of a power distribution area is high. In addition, the operation management is inconvenient, high-altitude operation maintenance equipment which needs to be used is more, components are more, wiring is disordered, installation is complex, workload is large, time is long, and power supply reliability is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the above-mentioned not enough that exists among the prior art, provide a distribution transformer, can improve distribution transformer's security performance, ensure distribution safety.
Solve the utility model discloses in above-mentioned technical problem's technical scheme as follows:
a distribution transformer comprises an oil tank, a transformer body assembly and a protection assembly,
the transformer body assembly comprises a triangular three-dimensional wound core, a high-voltage coil and a low-voltage coil, and the high-voltage coil and the low-voltage coil are sleeved on the triangular three-dimensional wound core;
the protection component comprises a high-voltage fuse and a low-voltage circuit breaker,
the high-voltage fuse is connected between the high-voltage coil and the high-voltage transmission line and used for cutting off the connection between the high-voltage coil and the high-voltage transmission line when the distribution transformer is in short circuit;
and the low-voltage circuit breaker is connected between the low-voltage coil and a low-voltage outlet end of the distribution transformer and is used for cutting off the connection between the low-voltage coil and the low-voltage outlet end when the distribution transformer is overloaded and has a secondary short circuit.
Preferably, the protection component further comprises an arrester, and the arrester is arranged on a cover of the oil tank.
Preferably, the protection assembly further comprises an early warning device, the early warning device comprises an indicator light, an early warning circuit, a relay and a controller,
the indicating lamp and the relay are connected in series on the early warning circuit, the indicating lamp is positioned outside the oil tank, and the relay is used for controlling the on-off of the early warning circuit;
the low-voltage circuit breaker is provided with a current threshold value and is connected with the controller and used for sending an early warning signal to the controller when the current flowing through the low-voltage circuit breaker reaches the current threshold value,
the controller is also electrically connected with the relay and used for controlling the relay to be closed according to the early warning signal sent by the low-voltage circuit breaker so as to enable the early warning circuit to be communicated and light the indicator lamp.
Preferably, the protection assembly further comprises an operating handle,
and the operating handle is connected with the low-voltage circuit breaker and used for controlling the on-off of the low-voltage circuit breaker.
Preferably, the body assembly further comprises a high voltage lead terminal, a low voltage lead terminal, a primary bushing, and a secondary bushing,
the high-voltage lead terminal is used for connecting a high-voltage transmission line, and is sequentially connected with the high-voltage fuse and the high-voltage coil in series, and the primary sleeve is sleeved on the high-voltage lead terminal;
the low-voltage lead terminal is used for connecting a low-voltage wire outlet end of the distribution transformer, the low-voltage wire outlet end is connected with the low-voltage circuit breaker and the low-voltage coil in series in sequence, and the secondary sleeve is sleeved on the low-voltage lead terminal.
Preferably, the high-voltage fuse and the low-voltage circuit breaker are located in transformer oil in the oil tank.
Preferably, the oil tank is a triangular corrugated oil tank.
Preferably, a pressure relief valve is provided on the tank to prevent over-pressurization of the tank.
The utility model discloses a distribution transformer has functions such as break-make current, overload protection, short-circuit fault protection, can take place the short circuit at distribution transformer, break off distribution transformer and transmission line through high tension fuse or low voltage circuit breaker when faults such as overload to realize the self-protection, compare in current distribution transformer, overcome current distribution transformer self-protection unreliable, inconvenient not enough, can effectively improve distribution transformer's security performance, ensure distribution safety.
Drawings
Fig. 1 is a schematic structural view of a distribution transformer in an embodiment of the present invention;
fig. 2 is a schematic diagram of the internal wiring of the distribution transformer in the embodiment of the present invention;
fig. 3 is a schematic structural view of the triangular three-dimensional roll core in the embodiment of the present invention.
Wherein: 1-a triangular three-dimensional coiled iron core; 2-a high-voltage coil; 3-a low-voltage coil; 4-an oil tank; 5-high voltage lead terminal; 6-high voltage fuse; 7-primary sleeve; 8-low voltage circuit breakers; 9-low voltage lead terminal; 10-secondary sleeving; 11-a lightning arrester; 12-an indicator light; 13-operating handle.
Detailed Description
In order to make the technical field of the present invention better understand, the drawings and the specific embodiments of the present invention will be combined, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, for further clear and complete description of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the present embodiment discloses a distribution transformer, which includes an oil tank 4, a body assembly, and a protection assembly, wherein: the transformer body assembly comprises a triangular three-dimensional wound core 1, a high-voltage coil 2 and a low-voltage coil 3, wherein the high-voltage coil 2 and the low-voltage coil sleeve 3 are arranged on the triangular three-dimensional wound core 1; the protection component comprises a high-voltage fuse 6 and a low-voltage circuit breaker 8, wherein the high-voltage fuse 6 is connected between the high-voltage coil 2 and the high-voltage transmission line and used for cutting off the connection between the high-voltage coil 2 and the high-voltage transmission line when the distribution transformer is in short circuit, and the low-voltage circuit breaker 8 is connected between the low-voltage coil 3 and the low-voltage outlet end of the distribution transformer and used for cutting off the connection between the low-voltage coil 3 and the low-voltage outlet end when the distribution transformer is overloaded and in secondary short circuit.
Specifically, the body assembly includes a high-voltage coil 2, a low-voltage coil 3, a high-voltage lead terminal 5, a low-voltage lead terminal 9, a primary bushing 7, and a secondary bushing 10. The high-voltage coil 2 and the low-voltage coil 3 are sleeved on the triangular three-dimensional wound iron core 1 and are fixed into a whole through an accessory structural component. High voltage lead terminal 5 is used for connecting high tension transmission line, it and high tension fuse 6, high tension coil 2 establishes ties in proper order, sleeve pipe 7 suit is on high voltage lead terminal 5 once, high tension fuse 6 is used for cutting off distribution transformer's high pressure side circuit (being high tension coil 2 and high tension transmission line's being connected promptly) when faults such as short circuit take place inside distribution transformer, in order to carry out overload protection, compare and adopt the fuse to carry out overload protection among the prior art, high tension fuse 6 simple to operate, the mistake installation of fuse has been avoided completely. The low-voltage lead terminal 9 is used for connecting the low-voltage wire outlet end of the distribution transformer, the low-voltage lead terminal is sequentially connected with the low-voltage circuit breaker 8 and the low-voltage coil 3 in series, the secondary sleeve 10 is sleeved on the low-voltage lead terminal, and the low-voltage circuit breaker 8 is used for cutting off a low-voltage side circuit of the distribution transformer (namely, the low-voltage coil 3 is connected with a low-voltage wire outlet section of the distribution transformer) when overload current occurs on the low-voltage side of the distribution transformer so as to prevent the distribution transformer from being damaged when overload or secondary side short circuit occurs. Moreover, the high-voltage fuse 6 (i.e., the high-voltage backup protection fuse) and the low-voltage circuit breaker 8 (i.e., the low-voltage oil immersed circuit breaker) are both in the transformer oil in the oil tank 4, and the body of the distribution transformer, the high-voltage fuse 6 and the low-voltage circuit breaker 8 are preferably designed to be integrated and are immersed in the transformer oil together.
In some embodiments, the oil tank 4 is preferably a triangular corrugated oil tank. Compared with the prior art, the distribution transformer has the advantages of balanced three-phase magnetic circuits of the transformer body, high mechanical strength, good short-circuit resistance, good heat dissipation performance, low loss and low noise by adopting the triangular three-dimensional roll iron core 1 and the triangular corrugated oil tank, and is attractive in appearance.
In some embodiments, a pressure relief valve (not shown in the drawings) is disposed on the oil tank 4, when the pressure in the oil tank 4 reaches an operation pressure threshold of the pressure relief valve, for example, when a fault such as a short circuit occurs inside the distribution transformer, transformer oil in the oil tank 4 is heated to crack to generate gas, so that the pressure in the oil tank 4 increases, and when the pressure in the oil tank 4 increases to the operation pressure threshold of the pressure relief valve, the pressure relief valve automatically opens to release pressure to the outside to prevent overpressure in the oil tank 4, and the operation pressure threshold of the pressure relief valve can be selected according to the capacity, oil amount, and other conditions of the distribution transformer.
In some embodiments, the protection assembly further comprises an arrester 11, and the arrester 11 is disposed on a cover of the oil tank 4 and is preferably located close to the high-voltage bushing (primary bushing 7) to prevent the distribution transformer from being damaged by lightning and improve the safety and reliability of the distribution transformer.
In some embodiments, the protection assembly further comprises an early warning device comprising an indicator light 12, an early warning circuit, a relay (not shown in the figures), and a controller, wherein: the indicating lamp 12 and the low-voltage circuit breaker 8 are connected in series on an early warning circuit, the indicating lamp is positioned outside the oil tank 4, the indicating lamp 12 is used for emitting light to perform early warning when the current on the low-voltage side is overloaded, and the relay is used for controlling the on-off of the early warning circuit; the low-voltage circuit breaker 8 is provided with a current threshold, and the low-voltage circuit breaker 8 is electrically connected with the controller and used for sending an early warning signal to the controller when the current flowing through the low-voltage circuit breaker 8 reaches the current threshold; the controller is also electrically connected with the relay and used for controlling the relay to be closed according to the early warning signal sent by the low-voltage circuit breaker 8, so that the early warning circuit is communicated to light the indicator lamp 12 for early warning.
In some embodiments, the protection assembly further comprises an operating handle 13, the operating handle 13 is connected to the low-voltage circuit breaker 8 and is disposed outside the oil tank 4, and is used for controlling the opening and closing of the low-voltage circuit breaker 8, for example, connecting and disconnecting a distribution transformer to and from a power transmission line, resetting the low-voltage circuit breaker 8, and the operation is simple and has no trip operation.
The distribution transformer of this embodiment, through setting up the protection subassembly, make distribution transformer not only have the function of transmission electric energy, can also realize breaking current, overload protection, functions such as short-circuit fault protection, make and to break off distribution transformer and transmission line when taking place the short circuit, transshipping when the trouble such as, thereby overcome current distribution transformer self-protection unreliable, inconvenient not enough etc, and then can improve distribution transformer's security performance, ensure distribution transformer's operation safety, particularly, can embody following aspect:
by arranging the low-voltage circuit breaker, when the distribution transformer is overloaded and a secondary side (low-voltage side) is short-circuited, a low-voltage side circuit can be automatically disconnected, and the distribution transformer is cut off from a power transmission line, so that the distribution transformer is prevented from being damaged;
the high-voltage fuse is arranged, so that a high-voltage side line can be automatically disconnected when faults such as short circuit and the like occur in the distribution transformer, so that overload protection is realized, and the high-voltage fuse can be used for disconnecting the high-voltage side line, so that the situation that the pressure in the oil tank is continuously increased and damaged due to the fact that the oil in the oil tank is continuously heated and cracked to generate gas caused by the faults such as internal short circuit and the like of the distribution transformer can be avoided;
through setting up the arrester, can avoid thunderbolt to cause the damage to distribution transformer.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A distribution transformer is characterized by comprising an oil tank (4), a transformer body assembly and a protection assembly,
the transformer body assembly comprises a triangular three-dimensional wound iron core (1), a high-voltage coil (2) and a low-voltage coil (3), and the high-voltage coil and the low-voltage coil are sleeved on the triangular three-dimensional wound iron core;
the protection component comprises a high-voltage fuse (6) and a low-voltage circuit breaker (8),
the high-voltage fuse is connected between the high-voltage coil and the high-voltage transmission line and used for cutting off the connection between the high-voltage coil and the high-voltage transmission line when the distribution transformer is in short circuit;
and the low-voltage circuit breaker is connected between the low-voltage coil and a low-voltage outlet end of the distribution transformer and is used for cutting off the connection between the low-voltage coil and the low-voltage outlet end when the distribution transformer is overloaded and has a secondary short circuit.
2. The distribution transformer according to claim 1, wherein the protection assembly further comprises a lightning arrester (11) provided on a lid of the tank.
3. The distribution transformer of claim 1, wherein the protection assembly further comprises a pre-warning device comprising an indicator light (12), a pre-warning line, a relay, and a controller,
the indicating lamp and the relay are connected in series on the early warning circuit, the indicating lamp is positioned outside the oil tank, and the relay is used for controlling the on-off of the early warning circuit;
the low-voltage circuit breaker is provided with a current threshold value and is connected with the controller and used for sending an early warning signal to the controller when the current flowing through the low-voltage circuit breaker reaches the current threshold value,
the controller is also electrically connected with the relay and used for controlling the relay to be closed according to the early warning signal sent by the low-voltage circuit breaker so as to enable the early warning circuit to be communicated and light the indicator lamp.
4. The distribution transformer according to claim 1, wherein the protection assembly further comprises an operating handle (13),
and the operating handle is connected with the low-voltage circuit breaker and used for controlling the on-off of the low-voltage circuit breaker.
5. The distribution transformer according to claim 1, wherein the body assembly further comprises a high voltage lead terminal (5), a low voltage lead terminal (9), a primary bushing (7), and a secondary bushing (10),
the high-voltage lead terminal is used for connecting a high-voltage transmission line, and is sequentially connected with the high-voltage fuse and the high-voltage coil in series, and the primary sleeve is sleeved on the high-voltage lead terminal;
the low-voltage lead terminal is used for connecting a low-voltage wire outlet end of the distribution transformer, the low-voltage wire outlet end is connected with the low-voltage circuit breaker and the low-voltage coil in series in sequence, and the secondary sleeve is sleeved on the low-voltage lead terminal.
6. The distribution transformer of any of claims 1-5, wherein the high voltage fuse and the low voltage circuit breaker are in transformer oil within the tank.
7. A distribution transformer according to any of claims 1-5, characterized in that the tank is a triangular corrugated tank.
8. A distribution transformer according to any of claims 1-5, characterized in that a pressure relief valve is arranged on the tank to prevent overpressure in the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120508280.2U CN215183478U (en) | 2021-03-10 | 2021-03-10 | Distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120508280.2U CN215183478U (en) | 2021-03-10 | 2021-03-10 | Distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215183478U true CN215183478U (en) | 2021-12-14 |
Family
ID=79414769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120508280.2U Active CN215183478U (en) | 2021-03-10 | 2021-03-10 | Distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215183478U (en) |
-
2021
- 2021-03-10 CN CN202120508280.2U patent/CN215183478U/en active Active
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