JPH0945564A - Integrated transformer functioning as power receiving and transforming facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the electric shock accident and reduce the size of facilities. SOLUTION: Near a coil 24 of a power distributing transformer Tr, the coils of a current transformer CT and instrument transformer PT are disposed contactlessly and electrically connected according to the principle of electromagnetic induction. The coil 24 of the transformer Tr and those of the transformers CT and PT are surrounded with an insulation mold material 12 to form a unified block of transformer Tr integrated with the transformers CT and PT, functioning as power receiving and transforming facilities. Thus the coil 24 of the transformer Tr and those of the transformers CT and PT are molded with the material 12 into a unified module so as not to exposed their high voltage parts to outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated type transformer function transformer for electric power receiving and transforming equipment, and more specifically, to a coil of a transformer for power distribution, and a transformer for a current transformer (CT) and an instrument.
(PT) coil is electrically connected according to the principle of electromagnetic induction, and by integrally blocking them with an insulating molding material, the integrated power receiving and transforming facility function is provided. It's about a transformer.

[0002]

2. Description of the Related Art Inside a cubicle installed in a substation or the like, a current transformer for measuring current, a transformer for measuring instrument for measuring voltage, a circuit breaker, and the like are arranged as required with a transformer for power distribution as a center. And each device is connected by a cable. As the transformer, a dry mold transformer molded with a synthetic resin or the like for deterioration and insulation protection is known.

[0003]

In the substation equipment including the transformer, the current transformer, the instrument transformer, and the like, each of the devices is configured as a separate body and is disposed inside the cubicle. The part and the cable itself were to be exposed. In this case, if the worker enters the inside of the cubicle during cleaning and maintenance work of each device constituting the substation equipment, an accident may occur in which the worker accidentally touches the exposed high-voltage portion and receives an electric shock. It was extremely dangerous work. In addition, since the devices are separately arranged, the work in the cubicle becomes complicated, the effective use of the internal space cannot be achieved, the equipment becomes large, and the manufacturing cost increases. Since a moving coil type ammeter is used as a conventional ammeter connected to a current transformer, a large current flows when the pointer is operated, which has caused an electric shock accident. Also, the voltmeter connected to the instrument transformer was of the contact type, which similarly caused an electric shock accident.

Further, an insect or a mouse often enters the inside of the cubicle. At this time, an electric shock is caused by touching a high-voltage portion where the insect or the mouse or the like is exposed, and the current transformer or the transformer for an instrument is touched. There is also a problem that an accident may be caused to deteriorate or break. That is, in the conventional cubicle, measures against electric shock accidents due to electric shocks to workers and mice are insufficient, and for example, there are hundreds of electric shock accidents per year. A proposal to resolve was awaited.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned drawbacks inherent in the prior art, and to prevent the occurrence of electric shock accidents and to reduce the size of equipment. It is an object of the present invention to provide an integrated type power receiving and transforming equipment function transformer capable of achieving

[0006]

In order to achieve the above object, an integrated type power receiving and transforming equipment function transformer according to the present invention has a coil of a current transformer and an instrument transformer arranged close to a coil of a power distribution transformer. Then, these coils are electrically connected by the electromagnetic induction principle, and a synthetic resin such as epoxy or a synthetic rubber such as butyl rubber is used as a material around the coil of the transformer, the coil of the current transformer and the transformer of the instrument. It is characterized in that it is filled with an insulating molding material and integrally formed into a block.

In order to achieve the above-mentioned object, an integrated type power receiving / transforming facility function transformer according to another invention of the present application is such that a synthetic resin such as epoxy or a synthetic rubber such as butyl rubber is formed on the outer surface of a coil in a transformer for power distribution. The insulating mold material to be covered with a required thickness is formed into a block, and the molded transformer coil block and the coil of the transformer and instrument transformer to be connected to the transformer coil are surrounded. , A synthetic resin such as epoxy or a synthetic rubber such as butyl rubber is filled to form an integrated block, and the coils of the respective transformers and transformers for the current transformer and the coil of the transformer, It is characterized in that the inside of the insulating molding material is electrically connected by an electromagnetic induction principle.

In order to achieve the above-mentioned object, an integrated type power receiving / transforming facility function transformer according to still another invention of the present application is such that a synthetic resin such as epoxy or a synthetic rubber such as butyl rubber is provided on the outer surface of a coil in a transformer for power distribution. An insulating mold material made of a material having a required thickness to form a block, and a block body of the molded coil of the transformer, a coil of a current transformer and an instrument transformer to be connected to the coil of the transformer, Around the circuit breaker to be connected to the transformer, an insulating molding material made of a synthetic resin such as epoxy or a synthetic rubber such as butyl rubber is filled and further integrated into a block, and the respective current transformers and meters are provided. The coil of the transformer is electrically connected to the coil of the transformer by the electromagnetic induction principle, and the breaker is electrically connected to the coil of the transformer by wiring. Characterized in that the configuration was.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an integrated type power receiving / transforming facility functional transformer according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments.

[0010]

[First Embodiment] FIG. 1 is a schematic configuration diagram of an integrated type power receiving / transforming facility function transformer according to a first embodiment, in which a coil 2 of a transformer Tr (combination of single-phase or three-phase) for power distribution is shown.
4, the coils of the current transformer CT and the instrument transformer PT are arranged in a non-contact state, and these coils are electrically connected by the electromagnetic induction principle. And transformer T
The current transformer CT and the instrument transformer PT are integrated by filling the insulating mold material 12 around the coil of the r coil 24, the current transformer CT and the instrument transformer PT to integrally block the coil. A transformer Tr having the function of the power receiving and transforming facility is configured. That is, the coil 24 of the transformer Tr, the current transformer CT, and the coil of the instrument transformer PT are integrally molded by the insulating molding material 12 so that the high voltage portion thereof is not exposed to the outside. In addition, this integrated type power receiving and transforming facility function transformer Tr is
It is housed and arranged inside the cubicle 10 as an exterior body. As the insulating mold material 12, synthetic resins such as epoxy and polyester, and synthetic rubbers such as butyl rubber and ethylene / propylene rubber are preferably used. In addition, when the coil 24 of the transformer Tr, the current transformer CT and the coil of the instrument transformer PT are integrally molded, it is also possible to appropriately select whether or not the magnetic field is emitted to the outside. It is possible to

FIG. 2 schematically shows the relationship between the coil 24 of the transformer Tr and the coils of the digital current transformer CT and the instrument transformer PT. One coil in the coil 24 of the transformer Tr is shown in FIG. Current transformer C for winding 19
The current is measured by the ammeter A in a state where the coil of T is faced in a non-contact manner (see FIG. 2 (a)). Further, as shown in FIG. 2B, the voltage is measured by the voltmeter V in a state where the coil of the meter transformer PT faces the one winding 19 of the coil 24 of the transformer Tr in a non-contact manner. Configured to do so. That is, since the voltage applied to one winding 19 of the coil 24 is extremely small, the coils of the current transformer CT and the instrument transformer PT should not be in contact with the winding 19 and the arrangement distance should be extremely small. As a result, the current flowing through the current transformer CT and the instrument transformer PT can be made extremely small (for example, 0.1 mA to 0.01 mA). As a result, it is possible to suppress the generation of heat to an extremely small extent, improve the safety, and reduce the cost. The ammeter A and the voltmeter V are integrally incorporated inside the insulating mold material 12.

In the step of manufacturing the transformer Tr, the current transformer CT and the voltage transformer PT are integrally manufactured so that the current transformer CT and the voltage transformer PT are provided outside the transformer body. No live parts are exposed. An ammeter A connected to the current transformer CT and a voltmeter V connected to the voltage transformer PT.
Can be disposed outside the insulating mold material 12.

FIG. 3 shows an example of a circuit diagram of the transformer Tr, which is a coil 24 (secondary winding) of the transformer Tr.
By electromagnetic induction between the coil and the coil (tertiary winding) of the instrument transformer PT, the measurement by the instrument transformer PT is achieved. Further, the electromagnetic wave is induced between the coil 24 (secondary winding) of the transformer Tr and the coil of the current transformer CT so that the measurement by the current transformer CT is achieved. As described above, since the coil 24 of the transformer Tr and the coils of the current transformer CT and the transformer for instrument PT are electrically connected in a non-contact manner by the principle of electromagnetic induction, the current flowing through these electric instruments is extremely small. Moreover, a remarkable miniaturization is realized. In the circuit example shown in FIG. 3, the current transformer CT and the instrument transformer PT are connected to the measurement / display data output / printer output unit 26 provided in the coil. , Current, power, phase, phase loss, and harmonics can be displayed digitally or printed out as needed. Incidentally, the output unit 26 is provided with, for example, a liquid crystal panel 28 at a required position on the outer surface of the transformer Tr shown in FIG. 4, and the display of various measured values and data is switched by a switching button 30 provided in the output unit 26. It is configured to be. The coil of the current transformer CT can be electrically connected to the coil 24 (primary winding) of the transformer Tr or the coil (tertiary winding) of the instrument transformer PT by the principle of electromagnetic induction. .

A cable 18 drawn into the inside of the cubicle 10 and connected to the transformer Tr is also molded with an insulating molding material 20. Therefore, since the high-pressure portion is not exposed inside the cubicle 10, the worker does not need to expose the cubicle 10 to cleaning and maintenance of each device.
There is no risk of electric shock when working inside the machine. In addition, by molding the current transformer CT and the instrument transformer PT, the durable life thereof can be improved, and deterioration and damage due to electric shock such as insects and mice can be prevented. As the insulating mold material 20 of the cable 18, a transparent material whose inside (cable) can be seen through for inspection or the like and which is flexible is preferably adopted.

Since the coil 24 itself of the transformer Tr is filled with the insulating molding material 12 to form a block, the coil 24 itself is unlikely to cause a fire or other failure due to heat generation or the like. Absent. Also,
Also with respect to the current transformer CT and the instrument transformer PT, since an extremely weak current flows as described above, the possibility of occurrence of failure is extremely low, and functions accurately up to the service life. By the way, as the capacity of the transformer Tr, all capacity from small capacity to large capacity can be used. In the case of an example, a capacity of 2000 KVA to 20000 KVA is used. obtain. And even if it has a large capacity, there is almost no possibility of causing a fire or other failure.

A through hole (not shown) communicating with the outside is provided at a position of the insulating mold material 12 corresponding to the current transformer CT and the instrument transformer PT so that heat can be radiated. Is recommended. Further, a connecting portion between the transformer Tr and the cable 18 arranged in the cubicle 10 is
It is possible to completely eliminate the exposure of the high-pressure portion in the cubicle 10 by performing the operation inside the cubicle 10 and at a place where there is no danger of being touched by the operator (for example, in the ground).

[0017]

[Second Embodiment] FIG. 5 is a schematic configuration diagram of an integrated type power receiving and transforming facility function transformer according to a second embodiment, in which a coil 24 of a power distribution transformer Tr has an insulating molding material 22 on its outer surface. It is coated in the required thickness and is blocked. Around the molded block body of the coil 24 of the transformer Tr and the coils of the current transformer CT and the instrument transformer PT to be connected to the coil 24 of the transformer Tr,
The insulating molding material 12 is filled and integrally formed into a block. The coils of the current transformer CT and the transformer PT for instrument and the coil 24 of the transformer Tr are electrically connected to each other inside the insulating mold materials 22 and 12 by the principle of electromagnetic induction as in the above-described embodiments. It is connected.
That is, even in the integrated type power receiving and transforming facility function transformer Tr according to the second embodiment, the high-voltage portion is not exposed, so that it is possible to prevent an electric shock accident and a fire from occurring to the worker. In addition, the current transformer C in the insulating mold material 12
Through holes 12a, 12a communicating with the outside are provided at corresponding positions of the T and the transformer PT for instruments so that heat dissipation can be promoted.

[0018]

[Third Embodiment] FIG. 6 is a schematic configuration diagram of an integrated type power receiving / transforming facility functional transformer according to a third embodiment, in which a coil 2 of a transformer Tr molded by an insulating molding material 22 is shown.
4 around the block body, the coil of the current transformer CT and the instrument transformer PT to be connected to the coil 24 of the transformer Tr, and the breaker VCB to be connected to the transformer Tr. Are filled and are integrally blocked. The coils of the current transformer CT and the instrument transformer PT are electrically connected to the coil 24 of the transformer Tr by the principle of electromagnetic induction, and the breaker VCB is electrically connected to the coil 24 of the transformer Tr by wiring. Has been done. As described above, the coil 24 of the transformer Tr, the current transformer CT and the coil of the instrument transformer PT, the circuit breaker VC
By filling the insulating mold material 12 around B and integrally forming a block, the current transformer CT and the transformer P for the instrument P
An integrated type power receiving and transforming facility function transformer Tr having the function of the power receiving and transforming facility in which T and the circuit breaker VCB are integrated is configured.

In the third embodiment, the transformer T
A coil of another current transformer CT is electrically connected to the secondary side of the coil 24 of r by the principle of electromagnetic induction, and the coil of the current transformer CT is also integrally blocked by the insulating molding material 12. . As a result, the high pressure portion is not exposed at all. Further, the cable 18 wired inside the cubicle 10 is also covered with a molding material 20 such as a transparent and flexible insulating material.

The current transformer CT connected to the secondary side of the coil 24 of the transformer Tr is connected to an overcurrent determination circuit (or demand meter) 14 arranged outside the insulating molding material 12, and The current determination circuit 14 uses the circuit breaker VC
It is connected to B. Then, when a current more than a predetermined value flows in the transformer Tr, this is detected by the current transformer CT,
The overcurrent determination circuit 14 operates the circuit breaker VCB to instantaneously cut off the circuit to protect the transformer Tr. A through hole 12c is formed in the insulating mold material 12 at a position corresponding to the circuit breaker VCB so that heat radiation and movement of the movable portion can be performed smoothly.

Further, instead of operating the circuit breaker VCB by the overcurrent determination circuit 14, an appropriate alarm lamp may be turned on or an alarm sound may be emitted by a buzzer or the like. Further, it is possible to dispose the transformer current transformer CT and the overcurrent determination circuit 14 on the primary side of the coil 24 of the transformer Tr. When the overcurrent determination circuit 14 is used as described above, the transformer Tr is not the unit kVA of the maximum power consumption but the unit kW of the actual usage amount.
There is an advantage that it can be provided to the user as (= kVA × power factor).

In the third embodiment, since the circuit breaker VCB and the coil 24 of the transformer Tr are integrally molded, the portion from the circuit breaker VCB to the coil 24 of the transformer Tr is not exposed. It is possible to prevent electric shock accidents. Moreover, since a cable or the like for connecting each device is unnecessary, it is possible to reduce the cost and further downsize the entire equipment. It is also possible to detachably mount a separately molded circuit breaker VCB to the transformer Tr in which the current transformer CT and the instrument transformer PT are integrally molded. Further, the coil 24 of the transformer Tr, the current transformer CT and the instrument transformer PT
The coil and the circuit breaker VCB may be integrally molded with only the insulating molding material 12.

Here, as in the third embodiment, the circuit breaker VCB
In the case where the transformer 24 and the coil 24 of the transformer Tr are integrally molded, the service life of the circuit breaker VCB is tens of thousands of times, whereas the circuit breaker VCB actually operates several times a year. Because it's not so, coil 24 of transformer Tr
It is extremely unlikely that the circuit breaker VCB will fail before the service life of That is, there is almost no need for replacement due to a failure until the useful life passes, and the running cost can be reduced.

In addition, the combination connection (V-
V connection) makes it possible to make the secondary low-voltage cable into one line, so there is a built-in current transformer CT
The main breaker can be omitted by connecting, and the number of parts can be reduced and the cost can be reduced.

[0025]

[Fourth Embodiment] FIG. 7 is a schematic configuration diagram of an integrated type power receiving and transforming facility function transformer according to a fourth embodiment, in which an insulating molding material 1 is formed on the outer surface of a coil 24 of a transformer Tr for power distribution.
2 is covered with a required thickness to form a block. The outer surface of the coil of the current transformer CT or the instrument transformer PT, which is to be electrically connected to the coil 24 of the transformer Tr, is also covered with the insulating molding material 16 in a required thickness to form a block. The required number of recesses 12 are formed on the surface of the molded block body of the coil 24 of the transformer Tr.
b is formed, and each block body obtained by molding the coil of the current transformer CT or the transformer PT for instrument is detachably fitted and fixed in the recess 12b. The block body of the current transformer CT or the instrument transformer PT is fixed to the insulating mold material 12 via an appropriate fixing tool (not shown). The coil of the current transformer CT or the transformer PT for instrument and the coil 24 of the transformer Tr are electrically connected inside the insulating mold materials 12 and 16 by the principle of electromagnetic induction. Further, each recess 12b of the insulating molding material 12 is provided with a through hole 12a communicating with the outside so that heat dissipation can be promoted.

In the type in which the block body of the coil of the current transformer CT or the transformer PT for the instrument can be separably integrated with the block body of the coil 24 of the transformer Tr as in the fourth embodiment, the current transformer CT or the instrument is provided. Only the block body of the transformer PT can be replaced. Further, in the configuration of the fourth embodiment, it is possible to dispose a molded circuit breaker VCB as a separate body in a detachable manner.

[0027]

As described above, according to the integrated transformer function transformer according to the present invention, the coil of the transformer, the current transformer and the coil of the instrument transformer are electrically connected in a non-contact state by the electromagnetic induction principle. After being electrically connected, the insulating mold material is filled in the surrounding area to integrally form a block, so that the high voltage portion is not exposed. Therefore,
For example, when the transformer is stored in a cubicle,
The occurrence of an electric shock accident in the cubicle can be effectively prevented, and cleaning and maintenance / inspection work can be safely performed.
In addition, it is possible to prevent current transformers and instrument transformers from deteriorating and breaking due to insects and mice entering the cubicle, and to improve running life and reduce running costs. It becomes possible. In this case, free maintenance of the substation equipment can be achieved. Furthermore, by integrating the coil of the transformer, the current transformer, and the coil of the transformer for measuring instrument, the installation space of the transformer can be reduced, the equipment can be downsized, and the cost can be reduced. There are also advantages.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an integrated type power receiving and transforming facility function transformer according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a positional relationship between a current transformer and an instrument transformer and a winding.

FIG. 3 is a circuit diagram as an example of an integrated type power receiving and transforming facility function transformer according to the first embodiment.

FIG. 4 is an external front view of an integrated type power receiving and transforming facility function transformer.

FIG. 5 is an explanatory diagram showing an integrated type power receiving and transforming facility function transformer according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an integrated type power receiving / transforming facility functional transformer according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an integrated type power receiving / transforming facility functional transformer according to a fourth embodiment of the present invention.

[Explanation of symbols]

 12 Insulation Molding Material 22 Insulation Molding Material 24 Transformer Coil Tr Transformer CT Current Transformer PT Instrument Transformer VCB Circuit Breaker

Claims (3)

[Claims] 1. A coil (24) of a transformer (Tr) for power distribution.
The coil of the current transformer (CT) and the transformer for instrument (PT) are arranged close to each other, and these coils (24) are electrically connected by the electromagnetic induction principle, and the coil (24) of the transformer (Tr), Insulation molding material made of synthetic resin such as epoxy or synthetic rubber such as butyl rubber around the coil of current transformer (CT) and transformer for instrument (PT)
An integrated transformer for receiving and transforming equipment, which is characterized by being filled with (12) and integrated into a block. 2. The insulation molding material (22) made of synthetic resin such as epoxy or synthetic rubber such as butyl rubber is coated to a required thickness on the outer surface of the coil (24) of the transformer (Tr) for power distribution. A block body of the coil (24) of this transformer (Tr) that has been made into blocks, and a transformer (CT) and an instrument transformer (PT) to be connected to the coil (24) of the transformer (Tr). Insulation mold material (12) made of synthetic resin such as epoxy or synthetic rubber such as butyl rubber is filled around the coil and is further integrated into a block for each current transformer (CT) and instrument. The coil of the transformer (PT) and the coil of the transformer (Tr) (24), the insulating molding material
An integrated transformer for receiving and transforming equipment, which is characterized in that it is electrically connected inside the (22,12) by the electromagnetic induction principle. 3. An insulating molding material (22) made of synthetic resin such as epoxy or synthetic rubber such as butyl rubber is coated to a required thickness on the outer surface of the coil (24) of the transformer (Tr) for power distribution. A block body of the coil (24) of this transformer (Tr) that has been made into blocks, and a transformer (CT) and an instrument transformer (PT) to be connected to the coil (24) of the transformer (Tr). Around the coil and the circuit breaker (VCB) to be connected to the transformer (Tr), an insulating mold material (12) made of synthetic resin such as epoxy or synthetic rubber such as butyl rubber is filled and further The current transformer (CT) and instrument transformer (PT) coils are integrated into the transformer (Tr) coil (24) by the electromagnetic induction principle, and the circuit breaker (VCB) is Integrated that is configured to be electrically connected to the coil (24) of the transformer (Tr) by wiring. Power receiving and transforming equipment function transformer.