KR100415908B1 - Low Voltage a Phase Converter Bypass Connection Device Without Power Failure - Google Patents
Low Voltage a Phase Converter Bypass Connection Device Without Power Failure Download PDFInfo
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- KR100415908B1 KR100415908B1 KR10-2001-0046088A KR20010046088A KR100415908B1 KR 100415908 B1 KR100415908 B1 KR 100415908B1 KR 20010046088 A KR20010046088 A KR 20010046088A KR 100415908 B1 KR100415908 B1 KR 100415908B1
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- 238000010276 construction Methods 0.000 abstract description 3
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
본 발명은 무정전으로 변압기교체와 전선 교체에 필요한 저압 무정전 위상 변환 바이패스 장치에 관한 것으로, 종래에는 무정전으로 변압기를 교체시 3상 무정전 변압기 차량(7)을 이용하여 교체하고자 하는 변압기 1차측 특고압 바이패스 케이블(5)과 2차측 저압 바이패스 케이블(6)을 3상 모두를 바이패스 시킨 상태에서 변압기(3)를 교체하고 있었다. 이에 따라 활선작업으로 특고압을 연결하여 바이패스 작업을 하는데 작업이 복잡 및 위험성, 공사비과다 등의 문제점이 있었다. 따라서 본 발명은 저압 무정전 위상변환 바이패스 장치(8)를 기존 변압기 3대중 2대의 변압기 2상 전원을 3상 전원으로 변환하여 교체하고자 하는 변압기에 2차측 저압 바이패스(6) 연결하여 무정전 상태에서 교체한다, 나머지 변압기도 이와 같은 방법으로 순차적으로 교체하면 1차측 특고압 바이패스(5)를 하지 않고 간단히 변압기를 교체할 수 있다. 그리고 기존변압기 용량 부족시 인근 변압기을 이용하거나 또는 기존 무정전 변압기차와 결합하여 1차측 3상을 모두 바이패스을 하지 않고, 1상만 바이패스로 하여 3상변압기 교체가 가능하도록 회로를 구성 한다.The present invention relates to a low voltage uninterruptible phase shift bypass device required for transformer replacement and wire replacement with an uninterruptible power supply. In the related art, when a transformer is replaced with an uninterruptible power supply, a transformer primary side high pressure to be replaced using a three-phase uninterruptible transformer vehicle 7 is known. The transformer 3 was replaced while the bypass cable 5 and the secondary low voltage bypass cable 6 were bypassed in all three phases. Accordingly, bypass work was performed by connecting extra high pressure with live work, and there were problems such as complexity, risk, and excessive construction cost. Therefore, in the present invention, the low voltage uninterruptible phase shift bypass device 8 is connected to a secondary low voltage bypass 6 to a transformer to be replaced by converting two transformer two-phase power into three-phase power of the existing three transformers in an uninterrupted state. If the remaining transformers are sequentially replaced in this manner, the transformer can be simply replaced without performing the primary side high voltage bypass (5). When the capacity of the existing transformer is insufficient, the circuit is configured to replace the three-phase transformer by using only one phase and bypassing all three phases of the primary side by using a nearby transformer or by combining with an uninterruptible transformer vehicle.
Description
본 발명은 무정전으로 변압기교체와 전선 교체에 필요한 저압무정전 위상변환 바이패스 장치에 관한 것으로, 특히 주상 변압기를 무정전 상태에서 교체시 1차측 특고압 바이패스를 하지 않고, 2차측 저압 바이패스 작업만으로 해당 변압기를 교체할 수 있도록 한 저압무정전 위상변환 바이패스 장치에 관한 것이다.The present invention relates to a low voltage uninterruptible phase shift bypass device required for transformer replacement and wire replacement with an uninterruptible power supply. In particular, when replacing a pole-type transformer in an uninterruptible state, the primary side high pressure bypass is not performed. A low voltage uninterruptible phase shift bypass device that allows a transformer to be replaced.
일반적으로 주상변압기는 특고압(22900V)의 배전선로로부터 전력을 공급받아 변압하여 일반 사용전압(380V,220V)의 선로로 공급하는 장치로서 통상 3상 전원을 변압하기 위하여 단상변압기 3대가 설치된다.In general, a columnar transformer is a device that receives power from a distribution line having a special high voltage (22900V) and converts the power to a line of general use voltages (380V and 220V). Three single-phase transformers are usually installed to transform a three-phase power source.
도 1a와 도 1b는 일반적인 주상 변압기의 결선방법을 도시한 것이다.1A and 1B illustrate a method of connecting a general column transformer.
도면을 참조하면, 도 1a와 같은 변압기 결선방법은 특고압선로(1)의 A상, B상, C상 선로를 각각 A상, B상, C상 변압기(3)의 1차측에 결선하고, 각 상 변압기(3)의 2차측 출력을 저압선로(2)의 각 상에 결선하며, 상기 3개의 변압기(3)의 접지인하선(4)을 붓싱단자에서 공동접지하여 단독으로 인하하여 저압선로(2)의 N상 선로에 연결한다.도 1b와 같이 변압기(3)의 2차 인하선 결선 방법은 각상 변압기(3)의 접지인하선(4')을 각각 인하하여 저압선로(2)의 N상 선로에 연결하는 방법 2가지 방법으로 변압기를 결선하고 있다.Referring to the drawings, as shown in FIG. 1A, the A, B and C phase lines of the extra high voltage line 1 are connected to the primary side of the A, B and C phase transformers 3, respectively. The secondary output of each phase transformer 3 is connected to each phase of the low voltage line 2, and the ground lowering lines 4 of the three transformers 3 are jointly grounded at the bushing terminal to be lowered alone to lower the voltage line. As shown in FIG. 1B, the method for connecting the secondary lowering line of the transformer 3 is to lower the grounding lowering line 4 'of each transformer 3 so that the low voltage line 2 How to connect to the N-phase line There are two ways to connect the transformer.
도 1a와 같은 결선방식은 과거 권선접속으로 연결하여 접속개소를 줄이기 위해 사용하는 방법으로 현재에는 접속방식이 스리브 압축으로 개선되고, 또한 과거와 현재 부하특성 변화로 중성선에 제3고조파에 의한 과전류로 중성선 단선시 이상 전압을 방지하고, 무정전으로 바이패스를 쉽게 하기 위해서 도 1b와 같은 방법으로 변압기 인하선 결선을 많이 하고 있다.The connection method as shown in FIG. 1A is a method used to reduce connection points by connecting to a winding connection in the past. Currently, the connection method is improved by a sleeve compression and an overcurrent caused by a third harmonic on the neutral line due to changes in the past and present load characteristics. In order to prevent abnormal voltage during the disconnection of the neutral wire and to easily bypass by uninterruption, a transformer down wire connection is performed in the same manner as in FIG. 1B.
도 2는 종래 변압기교체 방법을 설명하기 위한 3상 무정전 변압기차의 바이패스 결선 방법에 관한 것이다.2 is a bypass connection method of a three-phase uninterruptible transformer vehicle for explaining a conventional transformer replacement method.
도 2에 도시된 바와같이, 특고압선로(1)의 각상이 각각 3개의 변압기(3)의 1차측에 결선되고, 그 변압기(3)의 2차측이 저압선로(2)의 각상에 결선되어 있어서, 무정전 변압기차량(7)을 이용하여 3상변압기를 교체시 특고압선로(1)의 각상에 1차측에 특고압 바이패스선(5)을 각각 연결하고, 저압선로(2)에 2차측 저압 바이패스선(6)을 연결한 다음 무정전 변압기차(7)에 전압을 인가해 3상 주상변압기에 무정전 바이패스 회로를 구성한다.As shown in Fig. 2, each phase of the extra high voltage line 1 is connected to the primary side of the three transformers 3, respectively, and the secondary side of the transformer 3 is connected to each phase of the low voltage line 2, Thus, when replacing the three-phase transformer using the uninterruptible transformer vehicle (7), each of the extra high voltage bypass line (5) is connected to the primary side of each of the extra high voltage line (1), and the secondary side to the low voltage line (2) After connecting the low voltage bypass line 6, voltage is applied to the uninterruptible transformer car 7 to form an uninterrupted bypass circuit in the three-phase columnar transformer.
이와같이 3상 모두를 무정전 변압기차(7)을 통해서 무정전 상태를 유지하면서 변압기를 교체하게된다.In this way, all three phases are replaced by the transformer while maintaining the uninterrupted state through the uninterruptible transformer car (7).
그런데, 상기 무정전 변압기차(7)를 이용하는 경우 변압기(3)를 교체함에 있어서 1차측 특고압 바이패스선(5)을 연결하기 위해, 22.9KV 활선차량과 활선전공이 추가로 필요하고, 또한 활선상태에서 인하선 연결 및 분리 작업이 복잡하여 안전에 위험이 있고, 변압기 교체시간이 많이 걸리는 문제점이 있었다. 그리고, 무정전 변압기 차량(7)과 활선차량이 추가로 있어야 무정전으로 변압기 교체가 가능함으로 골목길 등 협소한 장소에는 작업이 번거롭고, 차량통행에 방해가 되고 작업시간과 경비가 너무 많이 드는 단점이 있다.However, in the case of using the uninterruptible transformer vehicle 7, in order to connect the primary side high voltage bypass line 5 in replacing the transformer 3, an additional 22.9 KV live vehicle and live electric wire are required, There is a problem that the safety of the down-line connection and disconnection work in the state is dangerous, the transformer replacement takes a lot of time. In addition, the uninterruptible transformer vehicle 7 and the live vehicle can be additionally replaced by the uninterruptible transformer, so that the work is cumbersome in a narrow place such as an alley, and the traffic is hindered and the work time and expenses are too high.
본 발명은 저압무정전 위상변환 바이패스 장치를 이용하여 종래의 1차측 특고압 바이패스를 하지 않고, 2차측 저압 바이패스만으로 무정전으로 변압기를 교체할 수 있도록 한 저압무정전 위상변환 바이패스 장치를 제공하는데 목적이 있다.The present invention provides a low voltage uninterruptible phase change bypass device that allows a transformer to be replaced uninterrupted only by a secondary low pressure bypass without using a conventional primary side high voltage bypass using a low voltage uninterruptible phase shift bypass device. There is a purpose.
상기 목적을 달성하기 위한 본 발명은 저압 무정전 위상변환 바이패스 장치는 2상 전원을 3상으로 변환하여 바이패스 하는 원리로, 3상 변압기를 교체할 경우 2대의 변압기의 2상 전원을 저압 무정전 위상변환 바이패스 장치를 통해서 3상으로 변환하여 기존저압선로에 2차측 저압 바이패스함으로 무정전상태에서 변압기를 교체하도록 하는데 특징이 있다.The present invention for achieving the above object is a low-voltage uninterruptible phase conversion bypass device is a principle of bypassing by converting the two-phase power to three-phase, when replacing the three-phase transformer the low-voltage uninterrupted phase of the two-phase power of the two transformers It is characterized by converting the transformer in the uninterrupted state by converting to 3 phase through the conversion bypass device and making the secondary low voltage bypass to the existing low voltage line.
이러한 구성에 의하면, 첫째 1차측 특고압 바이패스를 하지 않고 변압기를 교체할수 있어 작업이 간편하고, 작업시간을 단축함과 아울러 작업의 위험도를 줄일 수 있고, 변압기 교체 공사비를 절감할 수 있는 장점이 있고, 둘째, 기존 무정전 변압기 차량에 비해 소형화할 수 있어서 제작 비용을 줄일 수 있고, 소형화에 따라 좁은 골목까지 쉽게 접근할 수 있는 장점이 있다.According to this configuration, the transformer can be replaced without the first primary high-pressure bypass, thereby simplifying the work, reducing the risk of work, and reducing the cost of transformer replacement work. And, second, it can be miniaturized compared to the existing uninterruptible transformer vehicle can reduce the production cost, there is an advantage that can easily approach the narrow alley according to the miniaturization.
이러한 본 발명은 기존 무정전 변압기차를 이용하여 변압기 1차측, 2차측을 모두 바이패스하는 방법에 비해 저압무정전 위상변환 바이패스 장치를 이용하여 변압기 2차측 저압 바이패스만 연결함으로 작업이 간단하고, 작업시간을 단축할 수 있다, 또한 종래의 1차측 특고압 바이패스에 필요한 장비로 특고압 1차바이패스 케이블, 특고압차단기, 특고압변압기, 1차측과 2차측을 위상 검상장치 등 장치가 복잡한 것에 비해, 본 발명은 2차측에만 바이패스 회로구성 하므로 설비가 간단하여 소형화 및 제작비용을 절감할 수 있다.The present invention is simpler by connecting only the transformer secondary side low voltage bypass by using a low voltage uninterruptible phase shift bypass device, compared to a method of bypassing both the transformer primary side and the secondary side using an uninterruptible transformer vehicle. It is possible to shorten the time, and also the equipment required for the conventional primary side high pressure bypass, which is used for complicated devices such as the high pressure primary bypass cable, the extra high voltage circuit breaker, the extra high voltage transformer, and the primary side and the secondary side of the phase inspection device. On the contrary, the present invention can simplify the installation and reduce the manufacturing cost since the bypass circuit is configured only on the secondary side.
도 1a 와 도 1b 은 주상 변압기의 결선방법1A and 1B show a method of connecting a column transformer
도 2는 종래 변압기교체 방법을 설명하기 위한 3상 무정전 변압기차의 바이패스 결선 방법2 is a bypass connection method of a three-phase uninterruptible transformer vehicle for explaining a conventional transformer replacement method.
도 3a는 종래의 무정전 변압기차를 이용한 3상 주상변압기 바이패스 결선도3A is a bypass diagram of a three-phase columnar transformer bypass using a conventional UPS.
도 3b는 본 발명에 의한 저압 무정전 위상변환 바이패스 장치을 이용한 3상 주상변압기 바이패스 결선도3b is a three-phase columnar transformer bypass connection diagram using a low voltage uninterruptible phase shift bypass device according to the present invention.
도 4a는 종래의 무정전 변압기차을 이용한 변압기 교체방법을 설명하기 위한 작업의 순서도Figure 4a is a flow chart of the operation for explaining the transformer replacement method using a conventional uninterrupted transformer vehicle
도 4b는 본 발명에 저압 무정전 위상변환 바이패스 장치을 이용한 변압기 교체방법을 설명하기 위한 작업의 순서도Figure 4b is a flow chart of the operation for explaining the transformer replacement method using a low voltage uninterruptible phase shift bypass device in the present invention
도 5a는 본 발명에 의한 기존 변압기 2대의 전원을 이용한 3상 주상 변압기의 무정전 변압기 교체 방법Figure 5a is a method for replacing an uninterruptible transformer of a three-phase columnar transformer using the power of two conventional transformers according to the present invention
도 5b는 본 발명에 의한 인근 변압기 2대의 전원을 이용한 3상 주상 변압기의 무정전 변압기 교체 방법5b is a method for replacing an uninterruptible transformer of a three-phase column-phase transformer using the power of two nearby transformers according to the present invention
도 5c는 본 발명에 의한 인근 변압기 3대의 전원을 이용한 3상 주상 변압기의 무정전 교체방법Figure 5c is an uninterruptible replacement method of the three-phase columnar transformer using the power supply of three nearby transformers according to the present invention
도 6은 본 발명에 의한 2상 전원을 3상 전원으로 변환하는 저압 무정전 위상변환 바이패스 장치의 주회로도6 is a main circuit diagram of a low voltage uninterruptible phase shift bypass device for converting a two-phase power source to a three-phase power source according to the present invention.
＜도면의 주요부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>
1 : 22.9kv 특고압선로 2 : 저압선로1: 22.9kv extra high voltage line 2: low voltage line
3 : 변압기 4(40): 변압기 2차 인하선3: transformer 4 (40): transformer secondary down line
5 : 1하측 특고압 바이패스선 6 : 2차측 저압 바이패스선5: 1 low side special high pressure bypass line 6: secondary low voltage bypass line
7 : 기존 3상 무정전 변압기차7: existing three-phase uninterruptible transformer car
8 : 저압 무정전 위상변환 바이패스 장치8: low voltage uninterrupted phase shift bypass device
10: 위상 변환회로 11: 저압차단기10: phase shift circuit 11: low voltage circuit breaker
이하, 본 발명에 의한 실시예를 첨부된 도면을 참조해서 상세히 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 3a는 종래의 무정전 변압기차를 이용한 3상 주상변압기 바이패스 결선도이다3A is a bypass connection diagram of a three-phase columnar transformer using a conventional UPS.
도 3a는 종래의 변압기 교체방식으로, 무정전 변압기차(7)을 이용하여 변압기 각상에 1차측에 특고압 바이패스(5)와 2차측에 저압 바이패스(6) 회로를 구성하여 변압기(3)를 교체하고 있었다FIG. 3A illustrates a conventional transformer replacement method, using the uninterruptible transformer car 7 to configure a circuit of a special high pressure bypass 5 on a primary side and a low pressure bypass 6 on a secondary side of a transformer 3. Was replacing
도 3b는 본 발명에 의한 저압 무정전 위상변환 바이패스 장치(8)를 이용한 3상 주상변압기 바이패스 결선도이다.3B is a three-phase columnar transformer bypass connection diagram using the low voltage uninterruptible phase shift bypass device 8 according to the present invention.
도 3b에 도시된 바와같이, 저압무정전 위상변환 바이패스 장치(8)를 이용하여 변압기 2차측 저압 바이패스(6)만 연결하고, 기존 변압기 2상전원을 저압무정전 위상변환 바이패스 장치(8)에 입력 단자에 연결하고, 출력 단자에는 교체대상 변압기 2차측 저압선로와 바이패스 회로를 구성하면, 저압무정전 위상변환 바이패스장치(8)에서 2상전원을 3상전원으로 변환해서 교체대상 변압기와 위상 검상후 자동으로 바이패스 회로가 구성된다.As shown in FIG. 3B, only the secondary voltage low voltage bypass 6 is connected using the low voltage uninterruptible phase shift bypass device 8, and the existing transformer two-phase power supply is connected to the low voltage uninterruptible phase shift bypass device 8. When the low voltage line and the bypass circuit of the transformer to be replaced are configured at the output terminal, the low voltage uninterruptible phase shift bypass device 8 converts the two-phase power into a three-phase power, The bypass circuit is automatically configured after phase inspection.
도 4a는 종래의 무정전 변압기차(7)를 이용한 변압기 교체방법을 설명하기 위한 작업의 순서도이다.4A is a flowchart of an operation for describing a transformer replacement method using a conventional uninterruptible transformer vehicle 7.
도면을 참조하면, 종래의 변압기 교체 작업순서로는 무정전 변압기차(7)를 이용해서 접지선을 연결한 상태에서 바이패스를 시행하게 된다. 즉, 교체변압기 1차측에 특고압바이패스(5)를 연결하고, 2차측에 저압바이패스(6)를 연결후, 1차측 공사용 개폐기(3)를 투입하여 검사후 이상이 없을 때 저압차단기(2)를 투입하여 무정전으로 바이패스 된 상태에서 변압기를 교체하고 있었다.Referring to the drawings, in the conventional transformer replacement work procedure, the bypass is performed while the ground wire is connected using the uninterruptible transformer car 7. That is, after connecting the special high pressure bypass (5) to the primary side of the replacement transformer, connecting the low pressure bypass (6) to the secondary side, inserting the primary side switch (3), and inspecting the low voltage breaker ( 2) The transformer was replaced while bypassed by uninterrupted power.
도 4b는 본 발명에 저압무정전 위상변환 바이패스 장치(8)를 이용한 변압기 교체방법을 설명하기 위한 작업의 순서도이다.4B is a flowchart of the operation for explaining the transformer replacement method using the low voltage uninterruptible phase shift bypass device 8 according to the present invention.
본 발명은 도 4b에 도시된 바와 같이 주상변압기(3)를 교체하기 위해 2차측 저압선로(2)를 저압무정전 위상변환 바이패스 장치(8)에 전기적으로 연결하여 교체한다. 본 발명은 위상변환 바이패스장치(8)를 접지한 상태에서 주상변압기(3)의 저압선로(2)를 연결하여 주상변압기(3)의 바이패스를 시도한다. 즉, 본 발명은 교체하지 않는 2대의 주상변압기(3)로 부터 저압바이패스선(6)을 위상변환 바이패스장치(8)에 전기적으로 연결한 후 오프되었던 전원개폐기(10) 및 부하개폐기(11)를 각각 온시키고 위상변환기(9)를 기동하는 것에 의해 바이패스된 2상전원을 3상전원으로 변환하여 전원을 공급함으로서 변압기 용량을 확인한 후 교체하고자 하는 주상변압기(3)의 COS(14)를 개방후 변압기 교체작업을 시행한다. 또한 3상변압기 모두 교체시 변압기 1대씩 순차적으로 바이패스후 변압기를 교체한다.The present invention electrically connects the secondary low voltage line 2 to the low voltage uninterruptible phase shift bypass device 8 to replace the columnar transformer 3 as shown in FIG. 4b. The present invention attempts to bypass the columnar transformer 3 by connecting the low voltage line 2 of the columnar transformer 3 while the phase shift bypass device 8 is grounded. That is, according to the present invention, the power switch 10 and the load switch (10) which are turned off after the low voltage bypass line (6) is electrically connected to the phase shift bypass device (8) from two column transformers (3) which are not replaced. 11) by turning on each phase and starting the phase converter 9 to convert the bypassed two-phase power into three-phase power and supply the power to confirm the transformer capacity, and then replace the COS (14) of the columnar transformer 3 to be replaced. Open the transformer and replace the transformer. In addition, if all three phase transformers are replaced, transformers are bypassed one by one and then the transformers are replaced.
이와같이 방법으로 변압기 교체시 기존 변압기에 걸리는 부하를 시간대별로 최대부하와 최소부하를 미리 예측을 해서 기존변압기에 부하가 작게 걸리는 시간대에 맞추어 변압기 교체작업을 하면 된다.도 6은 본 발명에 따른 바이패스 장치(8)를 보인 상세 회로도이다. 도면을 참조하면, 본 발명의 바이패스 장치(8)는 각각 3개의 입력단자(15)와 출력단자(16)를 갖고, 상기 입력단자(15)에는 전원개폐기(12)가 전기적으로 연결되고, 상기 전원개폐기(12)의 후단에는 2상을 3상으로 변환하기 위한 위상변환기(10)가 연결되며, 상기 위상변환기(10) 후단에는 부하개폐기(13)가 출력단자(16)와 전기적으로 연결되는 구조를 갖는다.이와 같은 구조에 의하면, 본 발명은 교체하고자 하는 단상변압기의 저압선로를 바이패스선(6)을 이용하여 바이패스 장치(8)의 출력단자(16)와 전기적으로 연결하고, 교체하지 않는 나머지 2대의 단상변압기를 저압선로를 다른 바이패스선(6) 2개를 이용하여 각각 입력단자(15)에 전기적으로 연결하며, 접지선은 위상변환기(10)와 전기적으로 연결하여 접지되게 한다.이러한 상태에서 오프되었던 전원개폐기(12)와 부하개폐기(13)를 온시키면 교체되지 않는 단상변압기의 2상이 입력단자(15)와 전원개폐기(12)를 통해 위상변환기(10)로 입력되며, 입력된 2상은 3상으로 변환되어 부하개폐기(13)와 출력단자(16)를 통해 교체하고자 하는 단상변압기의 저압선로로 출력된다. 이와 같이 2상을 3상으로 변환하여 교체하고자 하는 단상변압기의 저압선로측으로 3상전원이 인가되면 그때 COS(14)를 오픈하여 이탈시키고 새로운 변압기를 전기적으로 연결한다.이와 같은 방법에 의해 교체하고자 하는 변압기를 순서대로 교체할 경우 정전시키지 않고 변압기를 간단하게 교체할 수 있다.In this way, when the transformer is replaced, the load applied to the existing transformer is estimated in advance for the maximum load and the minimum load for each time zone, and the transformer replacement operation may be performed according to the time when the load is reduced to the existing transformer. FIG. 6 is a bypass according to the present invention. Detailed circuit diagram showing the device 8. Referring to the drawings, the bypass device 8 of the present invention has three input terminals 15 and output terminals 16, respectively, the power switch 12 is electrically connected to the input terminal 15, The rear end of the power switch 12 is connected to the phase converter 10 for converting the two phases to three phases, the load switch 13 is electrically connected to the output terminal 16 at the rear end of the phase converter 10. According to this structure, the present invention electrically connects the low voltage line of the single-phase transformer to be replaced with the output terminal 16 of the bypass device 8 using the bypass line 6, The remaining two single-phase transformers, which are not replaced, are electrically connected to the input terminal 15 using two low bypass lines (6), and the ground line is electrically connected to the phase converter (10). In this state, the power switch 12 that was turned off is shown. When the load switch 13 is turned on, two phases of the single-phase transformer which are not replaced are input to the phase converter 10 through the input terminal 15 and the power switch 12, and the input two phases are converted to three phases so that the load switch ( 13) and the output terminal 16 is output to the low voltage line of the single-phase transformer to be replaced. In this way, when three-phase power is applied to the low voltage line of the single-phase transformer that is to be replaced by converting two-phase to three-phase, the COS 14 is then opened and separated, and a new transformer is electrically connected. If the transformers are replaced in order, the transformer can be replaced simply without power failure.
본 발명은 변압기(3)의 2차측 저압 바이패스선(6)만으로 무정전으로 교체가 가능하게 되며, 교체대상 변압기 위상과 전압을 자동으로 맞추어 바이패스 되므로 작업이 간단해진다.In the present invention, the secondary low voltage bypass line 6 of the transformer 3 can be replaced by an uninterruptible power, and the operation is simplified because the phase of the transformer to be replaced is automatically adjusted and bypassed.
도 5a는 본 발명에 의한 기존 변압기 2대를 이용한 3상 주상 변압기의 무정전 교체 방법이고, 또한 기존 변압기에 부하가 많이 걸려 교체가 불가능할 경우 도 5b와 도5c와 같이 할 수 있다.즉, 도 5b는 인근 변압기 2대를 이용한 3상 주상 변압기의 무정전 교체 방법이고, 도 5c는 본 발명에 의한 인근 변압기 3대를 이용한 3상 주상 변압기의 무정전 교체방법이다.FIG. 5A illustrates an uninterruptible replacement method of a three-phase column-type transformer using two existing transformers according to the present invention, and when the existing transformer is heavily loaded and thus cannot be replaced, FIG. 5B and FIG. 5C may be performed. Is an uninterruptible replacement method of a three-phase columnar transformer using two neighboring transformers, and FIG. 5C is an uninterruptible replacement method of a three-phase columnar transformer using three neighboring transformers according to the present invention.
이에 도시된 바와같이, 종래에는 주상변압기를 무정전으로 교체하기 위해서 무정전 변압기차(7)를 이용해 변압기 1차측과 2차측을 바이패스를 한후 변압기를 교체하였다. 이에 반해 본 발명에 의한 주상변압기를 무정전으로 교체하기 위해서 저압 무정전 위상변환 바이패스 장치(8)를 이용하여 변압기(3)의 2차측 저압 바이패스(6)만으로 변압기를 교체한다.As shown in the related art, in order to replace the columnar transformer with an uninterruptible power supply, the transformer was replaced by bypassing the transformer primary side and the secondary side using the uninterruptible transformer car 7. On the contrary, in order to replace the columnar transformer according to the present invention with an uninterruptible power supply, the transformer is replaced only with the secondary low voltage bypass 6 of the transformer 3 using the low voltage uninterruptible phase shift bypass device 8.
그리고 종래 무정전 변압기차를 이용하여 변압기 1차측 특고압 바이패스(5)하기 위해서는 22.9kv 전압이 인가된 상태에서 바이패스 인하선을 연결하는데, 이러한 연결방법은 작업이 위험하고, 작업시 시간이 많이 걸리고 특히 22.9kv를 활선작업을 할 수 있는 활선바켓 차량이 추가로 필요하다.In addition, in order to bypass the transformer primary side high-voltage bypass 5 using a conventional uninterruptible transformer car, a bypass cut-off line is connected in a state where a voltage of 22.9kv is applied. There is a need for an additional live basket vehicle that can be hooked up and especially capable of working 22.9kv.
또한, 종래의 무정전 변압기차(7)를 구성을 보면 1차측 특고압 바이패스선(5), 특고압차단기, 특고압변압기, 탭전환장치, 검상장치, 저압차단기, 2차측 저압바이패스선(6) 등 장치 복잡하여, 무정전변압기차(7)의 외함이 크고, 가격이 비싸다. 이에반해 본 발명에 의한 저압무정전 위상변환 바이패스 장치(8)의 구성을 보면 2상을 3상으로 변환하는 변환회로(10), 저압차단기(11), 2차측 저압 바이패스선(6)으로 구성되어 있어 장치가 간단하고, 제작비가 싸고 대량보급이 가능한 이점이 있다.In addition, the configuration of the conventional uninterruptible transformer vehicle 7 includes the primary side high voltage bypass line 5, the extra high voltage circuit breaker, the extra high voltage transformer, the tap switching device, the inspection device, the low voltage circuit breaker and the secondary side low voltage bypass wire ( 6) The device is complicated and the enclosure of the uninterruptible transformer train 7 is large and expensive. On the other hand, in the configuration of the low voltage uninterruptible phase shift bypass device 8 according to the present invention, a conversion circuit 10 for converting two phases to three phases, a low voltage circuit breaker 11, and a secondary low voltage bypass line 6 are provided. The device is simple, the manufacturing cost is low, and there is an advantage that mass supply is possible.
그리고, 본 발명에 의하면 무정전 교체작업시 공사비를 단축할 수 있는데, 종래의 방법에 의하면 3상 변압기 교체시 무정전 변압기차(7)을 사용하여 변압기 1차측과 2차측을 모두 바이패스 해야하므로 작업이 위험, 복잡하고 작업시간이 많이 소요되고, 특히 1차측 특고압 바이패스(5) 연결작업을 위해 22.9kv 활선전공과 활선차량이 추가발생되고 이로인해 공사비가 많이 발생된다.이에 반해 본 발명에 의해 저압무정전 위상변환 바이패스 장치(8)를 이용하여 변압기(3)를 교체할 경우에는 종래와 같이 변압기 1차측 특고압 바이패스를 하지 않고, 2차측 저압 바이패스(6)만으로 변압기를 교체함으로 작업이 간단하고, 작업시간을 70％이상 단축할 수 있다. 또한 2차 저압 바이패스(6)만 시행함으로 22.9kv 활선전공과 활선차량은 추가필요 없고, 배전전공 만으로 작업이 가능함으로 공사비가 80％이상 절감된다.In addition, according to the present invention, the construction cost can be shortened during the uninterruptible replacement operation. According to the conventional method, since the transformer primary side and the secondary side must be bypassed by using the uninterruptible transformer car 7 when replacing the three-phase transformer, the work is performed. Dangerous, complicated and time-consuming, especially for the connection of the primary side high-pressure bypass (5), the additional 22.9kv live electric wire and the live vehicle is generated, resulting in a lot of construction costs. When the transformer 3 is replaced by the low voltage uninterruptible phase shift bypass device 8, the transformer is replaced with only the secondary low voltage bypass 6, without performing the transformer primary side high pressure bypass as in the prior art. This simple operation can reduce the work time by 70% or more. In addition, by implementing only the second low-pressure bypass (6), 22.9kv live electricity major and live vehicle need not be added.
또한, 종래의 3상 바이패스 방법에 의하면 변압기 교체시 반드시 1, 2차 상회전 방향(위상)을 확인해야하나 본 발명에서는 2차측 저압측 바이패스(6)만 하기 때문에 육안으로 상확인이 가능하고, 자동으로 위상을 감지하여 차단기(11)가 투입되기 때문에 위상확인이 불필요하게된다.In addition, according to the conventional three-phase bypass method, when the transformer is replaced, the first and second phase rotation directions (phases) must be checked, but in the present invention, since only the secondary low pressure side bypass 6 is used, phase confirmation is possible with the naked eye. Since the circuit breaker 11 is automatically sensed by detecting the phase, the phase check is unnecessary.
이상에서 상세히 설명한 바와 같이 본 발명에 의하면, 무정전으로 변압기를 교체시 2차측 저압 바이패스(6)만으로 변압기(3)를 교체할 수 있어 작업이 간단하고, 외함이 작아 골목길 등 협소한 장소에서도 변압기 교체작업이 가능하고, 특히 특1차측 특고압 바이패스(5) 연결작업에 필요한 특고압 활선전공 및 활선차량이 필요없어, 작업시 위험요소가 제거되어 안전한 작업이 가능해지며, 작업시간 및 인건비 절감 등의 월등히 향상되는 효과가 있다.As described in detail above, according to the present invention, when the transformer is replaced by an uninterruptible power supply, the transformer 3 can be replaced only by the secondary low voltage bypass 6, so that the operation is simple, and the enclosure is small, so that the transformer is in a narrow place such as an alley. Replacement work is possible, and in particular, no special high-pressure live electric wire and live vehicle required for the connection of the special high-pressure bypass (5) on the primary side are eliminated, which eliminates the risks and enables safe work, reducing work time and labor costs. There is an effect that is greatly improved.
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| KR10-2001-0046088A KR100415908B1 (en) | 2001-07-27 | 2001-07-27 | Low Voltage a Phase Converter Bypass Connection Device Without Power Failure |
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| KR10-2001-0046088A KR100415908B1 (en) | 2001-07-27 | 2001-07-27 | Low Voltage a Phase Converter Bypass Connection Device Without Power Failure |
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| Application Number | Title | Priority Date | Filing Date |
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| KR10-2001-0046088A Expired - Lifetime KR100415908B1 (en) | 2001-07-27 | 2001-07-27 | Low Voltage a Phase Converter Bypass Connection Device Without Power Failure |
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| Country | Link |
|---|---|
| KR (1) | KR100415908B1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100894881B1 (en) | 2007-07-25 | 2009-05-04 | 주식회사 평일 | Uninterruptible replacement method of high-voltage water circuit breaker and its bypass connection device |
| KR100973546B1 (en) * | 2008-06-09 | 2010-08-02 | 한국전력공사 | Uninterruptible replacement system for distribution transformers and low voltage lines Uninterruptible replacement system for distribution transformers and low voltage lines |
| KR101123272B1 (en) | 2009-09-29 | 2012-03-20 | 한국전력공사 | Temporary Transformer Device and Transformer Changing Method Using the Same |
| KR102307656B1 (en) | 2020-06-15 | 2021-10-05 | 한국전력공사 | Seperatable connector, rotation bushing, bypass line, automatic transfer switch, mounted stand, insulation cover for replacing transformer with uninterruptable power supply and method using the same |
| KR20240023960A (en) | 2022-08-16 | 2024-02-23 | 한국전력공사 | Insulation Cover for Ground Transformer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100769583B1 (en) * | 2006-07-04 | 2007-10-23 | 주식회사 평일 | Ground Transformer Replacement Method for Underground Distribution Lines by Uninterruptible Construction Method |
| KR101497340B1 (en) * | 2014-11-28 | 2015-03-03 | 이윤정 | Uninterruptible connecting panel of transformer for underground power distribution line |
-
2001
- 2001-07-27 KR KR10-2001-0046088A patent/KR100415908B1/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100894881B1 (en) | 2007-07-25 | 2009-05-04 | 주식회사 평일 | Uninterruptible replacement method of high-voltage water circuit breaker and its bypass connection device |
| KR100973546B1 (en) * | 2008-06-09 | 2010-08-02 | 한국전력공사 | Uninterruptible replacement system for distribution transformers and low voltage lines Uninterruptible replacement system for distribution transformers and low voltage lines |
| KR101123272B1 (en) | 2009-09-29 | 2012-03-20 | 한국전력공사 | Temporary Transformer Device and Transformer Changing Method Using the Same |
| KR102307656B1 (en) | 2020-06-15 | 2021-10-05 | 한국전력공사 | Seperatable connector, rotation bushing, bypass line, automatic transfer switch, mounted stand, insulation cover for replacing transformer with uninterruptable power supply and method using the same |
| KR20240023960A (en) | 2022-08-16 | 2024-02-23 | 한국전력공사 | Insulation Cover for Ground Transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20030011192A (en) | 2003-02-07 |
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