JPH1055921A - Receiving transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the electrification accident in the case of cleaning and inspection work to prevent trouble in measurement work of current and voltage due to cable breakdown. SOLUTION: The primary coil 10 and the secondary coil 12 of a transformer are separated in the diametral direction to be concentric circularly arranged while the coils of a current transformer CT and an instrument transformer PT are electrically connected to the secondary coil 12. Next, an insulating mold material 14 is filled up around the coils 10, 12 and the coils of the current transformer CT and the instrument transformer PT so as to make the elements into an integral block. Next, a sender 22 electrically connecting to the elements CT and PT is arranged inside the insulating mold material 14 of the transformer Tr. In such a constitution, the sender 22 outputs the received signals from the current transformer CT and the instrument transformer PT to a receiver completely separated from the transformer Tr.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power receiving transformer, and more particularly, to a transformer coil and a current transformer.
The present invention relates to a power receiving transformer in which an electrical transformer (CT) and an instrument transformer (PT) are electrically connected to each other, and these are integrally blocked by an insulating molding material.

[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 a conventional cubicle, measures against an electric shock accident caused by an operator or a mouse due to a mouse or the like are inadequate, and for example, an electric shock accident of an operator has been increased to several hundred cases per year.

[0005] Therefore, one proposal for addressing the various problems described above has been filed by the present applicant as an invention "integrated power receiving and transforming equipment function transformer". The transformer according to the prior application, under the condition that the current transformer and the transformer coil are electrically connected to the transformer coil, around the transformer coil, the transformer and the transformer coil, It is made by filling an insulating molding material and integrally forming a block. Therefore, the high-voltage portion is not exposed, and it is possible to prevent an electric shock accident and to prevent the current transformer and the instrument transformer from being deteriorated or damaged.

[0006] In the transformer blocked by the insulating molding material, the current value and the voltage value detected by the current transformer and the instrument transformer disposed inside the molding material must be displayed on an externally provided meter. is there. In this case, it is common to install the meter integrally on the outer surface of the transformer.However, if the installation orientation of the transformer is limited by the situation inside the cubicle, it is necessary for the operator to check when checking. The meter may face a part that is not easily accessible.
Therefore, it is proposed that a cable to be connected to the current transformer and the instrument transformer is drawn out of the transformer, and the cable is connected to a meter which is separated from the transformer and installed at a position where an operator can easily inspect the cable. However, in this case, the cable may be exposed and the operator may accidentally catch and break it during inspection work, or it may hinder the measurement work of current and voltage due to the rat being bitten and broken. There is a problem to be solved.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem suitably. In addition, an object of the present invention is to provide a power receiving transformer that does not hinder the measurement of current and voltage due to a break in a cable.

[0008]

In order to achieve the above-mentioned object, a power receiving transformer according to the present invention comprises a transformer having a current transformer and an instrument transformer electrically connected to a coil of the transformer. In a transformer in which an insulating mold material made of a synthetic resin such as epoxy or polyimide or a synthetic rubber such as butyl rubber is filled around a coil, a current transformer and an instrument transformer, the transformer is Transmitter that is electrically connected to the instrument and the instrument transformer,
A signal output from the transmitting device is integrally provided inside the insulating molding material, and the signal output from the transmitting device is received by a receiving device such as a meter separated from the block transformer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a power receiving transformer according to the present invention will be described with reference to the accompanying drawings by way of preferred embodiments.

FIG. 1 is a schematic perspective view of a power receiving transformer according to an embodiment, and FIG. 2 is a sectional view of a main part showing a schematic configuration of the power receiving transformer. A primary coil (high-voltage side) 10 and a secondary coil (low-voltage side) 12 of a power distribution transformer Tr (single-phase or three-phase combination) are arranged concentrically apart from each other in the radial direction. , Close to the outer secondary coil 12,
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. A plurality of current transformers CT and instrument transformers PT are provided as shown in FIG.
Here, only one unit is schematically shown. And the transformer Tr
Coils 10, 12, current transformer CT and instrument transformer P
The power receiving transformer Tr including the current transformer CT and the instrument transformer PT is formed by filling the insulation molding material 14 around the T coil and integrally forming the block. That is, the coils 10 and 12 of the transformer Tr, the coils of the current transformer CT and the transformer for instrument PT are integrally molded by the insulating molding material 14 so that the high-voltage portion is not exposed to the outside. .

As the insulating molding material 14, a synthetic resin such as epoxy, polyimide, polyester or the like, or a synthetic rubber such as butyl rubber or ethylene / propylene rubber is preferably used. The coils 10, 12 of the transformer Tr,
When the coils of the current transformer CT and the instrument transformer PT are integrally formed into a block, it is possible to appropriately select whether or not to prevent a magnetic field from coming out to the outside, or to make it come out.

As shown in FIG. 2, a central through hole 16 is formed in the insulating molding material 14 of the transformer Tr so as to open in the axial direction (vertical direction in the drawing) along the central axis of the primary coil 10. A core (iron core) 18 is inserted through the center through hole 16. Further, a plurality of ventilation holes 20 parallel to the center through hole 16 are formed in the insulating molding material 14 between the primary coil 10 and the secondary coil 12 and outside the secondary coil 12 so that each ventilation hole is formed. 20 is open to the outside. The ventilation holes 20 function to suppress a rise in temperature inside the transformer Tr by circulating external air, prevent a decrease in the output of the transformer Tr, and improve a service life.

As shown in FIG. 2, the current transformer CT and the measuring instrument are provided inside the insulating molding material 14 on the opposite side to the coil 12 with the ventilation hole 20 located outside the secondary coil 12 therebetween. A transmitting device 22 that is electrically connected to the transformer PT by a cable or the like is provided. This transmitting device 22
, Electronic circuits such as microcomputers and semiconductors are preferably used,
It is configured to output the signals of the current transformer CT and the instrument transformer PT taken into the transmitting device 22 to the receiving device 24 completely separated from the transformer Tr (see FIG. 3).
The receiving device 24 is configured to receive the signal output from the transmitting device 22 and display the current value and the voltage value measured by the current transformer CT and the instrumentation transformer PT in digital form or the like. The transmitting device 22 encodes the signals of the current transformer CT and the instrument transformer PT, or outputs the signal as it is to the receiving device 24 by infrared rays, radio waves, or the like.

Here, in the transformer Tr of the embodiment, the signals of the current transformer CT and the instrument transformer PT are taken in by the transmitting device 22 operating with small power, and then output to the receiving device 24 to be output to the receiving device 24. To display the measured value, the current transformer CT
In addition, the power output from instrument transformer PT can be set small. For example, the power of the instrument transformer PT can be 5 V, 1 A to 10 mA. Since the instrument transformer PT is used in a strong magnetic field, it is recommended that the instrument transformer PT be surrounded by a magnetic shield material 26 as shown in FIG.

The current transformer CT of the embodiment has a transformer Tr.
The transformer tap 28 connected to the secondary coil 12 is electrically connected to a position facing the inside of the insulating molding material 14. The connection form of the current transformer CT to the transformer tap 28 is shown in FIGS. For example, in the embodiment shown in FIG. 6, an arc-shaped storage section 30 is formed at a position facing the inside of the insulating mold material 14 in the transformer tap 28, and the coil of the current transformer CT is concentrically stored in the storage section 30. As a result, electric power corresponding to the current flowing through the transformer tap 28 is generated in the coil. By forming the transformer tap 28 in an arc shape in this manner, magnetic flux can be efficiently collected in the coil of the current transformer CT,
Even when the current flowing through the transformer tap 28 is small, it is possible to generate the power required to operate the transmitting device 22 including the electronic circuit.

In the embodiment shown in FIG. 7, the coil of the current transformer CT is arranged adjacent to the straight transformer tap 28. This embodiment is suitably used when the current flowing through the transformer tap 28 is large. You. In the embodiment shown in FIG. 8, a ring-shaped core 32 is externally fitted to a straight transformer tap 28, and a coil of a current transformer CT is arranged on the ring-shaped core 32. 8, the magnetic flux can be efficiently collected in the coil of the current transformer CT as in the embodiment shown in FIG.
It can be used preferably when the current flowing through is small.

[0017]

When the power receiving transformer Tr according to the above-described embodiment is housed inside a cubicle (not shown) as an exterior body, the receiving device 24 separated from the transformer Tr is used by an operator. Is easy to see for inspection etc.
(For example, a monitor installed in a cubicle). Further, the power receiving transformer Tr is installed in a direction according to the situation inside the cubicle. This power receiving transformer Tr
Is to integrally block the current transformer CT and the instrument transformer PT with the insulating molding material 14 and to convert the current value and the voltage value measured by the current transformer CT and the instrument transformer PT into the insulating molding material. Since the signal is output to the receiving device 24 by the transmitting device 22 integrated inside the cubicle 14, the high-pressure portion is not exposed inside the cubicle. Even if a worker enters the inside of the cubicle and performs work, there is no risk of electric shock. 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.

Furthermore, since there is no cable connecting the transformer Tr to an external meter or the like, an electric shock accident at this portion can be prevented, and the work for installing the transformer Tr without the need for wiring the cable is required. Performance can be improved. Further, the operator can always carry out the measurement with the current transformer CT and the instrumentation transformer PT without any troubles such that the cable is not erroneously hooked at the time of inspection or the mouse or the like is bitten and broken. In addition, the current transformer CT and the instrumentation transformer P
Since the measured value at T is output to and displayed on the external receiving device 24, the current transformer CT and the instrument transformer PT can be reduced in size, and the entire transformer can be reduced in size and cost. Can be achieved.

Although the embodiment has been described with reference to the case where one transmitting device 22 is provided inside the insulating molding material 14, a plurality of transmitting devices 22 are provided and the transmitting device 2 in use is provided.
In the case where a failure or the like occurs in the second device 2, a configuration in which the spare transmitting device 22 operates can be adopted. Transformer Tr
In the case where the primary coil 10 and the secondary coil 12 are opposite to the embodiment and the high-voltage primary coil 10 is disposed outside, the transmitting device 22 can be surrounded by a high-voltage insulating material or a magnetic shield material. Recommended.

[0020]

As described above, according to the power receiving transformer according to the present invention, the insulation molding material is provided around the transformer coil, the current transformer, and the instrument transformer while being electrically connected. In the transformer which is integrated into a block by filling it, a transmitting device electrically connected to the current transformer and the instrument transformer is disposed inside the insulating molding material, and the transmitting device is completely separated from the transmitting device. A signal is output to the received receiving device to display measured values and the like. That is, since the high-voltage portion is not exposed to the outside of the transformer, when the transformer is housed in, for example, a cubicle, an electric shock accident in the cubicle can be effectively prevented, and cleaning and maintenance work can be performed safely. I can do it. 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.
Further, since there is no cable connecting the respective devices outside the transformer, there is no possibility that the operator may break the cable by mistake or the mouse or the like may bite and break the cable to hinder the measurement.

Further, by integrating the transformer coil, the current transformer and the instrument transformer, it is possible to reduce the installation space of the transformer, to reduce the size of the equipment, and to reduce the cost. There is also. Furthermore, since the transmitting device is disposed at a position separated from the coil of the transformer with the ventilation hole formed in the insulating molding material interposed therebetween, the transmitting device is cooled by the air cooling of the external air flowing through the ventilation hole, and The effect of heat generated from the coil can be suppressed low. As a result, it is possible to prevent the function of the transmitting device from being deteriorated and to improve the service life.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a power receiving transformer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a schematic configuration of a power receiving transformer according to an embodiment.

FIG. 3 is an explanatory diagram illustrating a schematic configuration of a power receiving transformer according to an embodiment.

FIG. 4 is a circuit diagram as an example of a power receiving transformer according to the embodiment.

FIG. 5 is an explanatory diagram showing an instrument transformer of the power receiving transformer according to the embodiment.

FIG. 6 is an explanatory diagram illustrating an example of disposing a current transformer with respect to a transformer tap of a power receiving transformer according to an embodiment.

FIG. 7 is an explanatory diagram showing another example of disposing a current transformer with respect to the transformer tap of the power receiving transformer according to the embodiment.

FIG. 8 is an explanatory diagram showing still another example of disposing a current transformer with respect to the transformer tap of the power receiving transformer according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Primary coil 12 Secondary coil 14 Insulation molding material 20 Ventilation hole 22 Transmitting device 24 Receiving device Tr Transformer CT Current transformer PT Instrument transformer

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H02J 13/00 301 H01F 40/04 311 40/06

Claims (2)

[Claims] 1. A current transformer connected to coils (10, 12) of a transformer (Tr).
(CT) and the instrument transformer (PT) are electrically connected to each other, around the coils (10, 12), current transformer (CT), and instrument transformer (PT) of the transformer (Tr). A transformer (Tr), which is filled with an insulating molding material (14) made of a synthetic resin such as epoxy or polyimide or a synthetic rubber such as butyl rubber to form an integrated block, wherein the current transformer (CT) and the A transmitting device (22) electrically connected to the transformer (PT) is integrally provided inside the insulating molding material (14), and a signal output from the transmitting device (22) is
A power receiving transformer characterized in that the signal is received by a receiving device (24) such as a meter separated from the blocked transformer (Tr). 2. The insulating molding material (14) includes a part that is separated outward from the coil (10, 12) of the transformer (Tr),
A ventilation hole (20) that is open to the outside in parallel with the central axis of the coil (10, 12) is formed, and the coil (1) is sandwiched between the ventilation hole (20).
The power receiving transformer according to claim 1, wherein the transmitting device (24) is disposed inside the insulating molding material (14) on the side opposite to the side (0, 12).