JPH057616Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は負荷の開閉に応じてコンデンサを投
入、開放する力率改善用進相コンデンサ自動制御
装置（以下コンデンサ自動制御装置という）に関
するものである。[Detailed Description of the Invention] The present invention relates to a power factor improvement phase advance capacitor automatic control device (hereinafter referred to as a capacitor automatic control device) that closes and opens a capacitor in accordance with the opening and closing of a load.

一般に力率改善用進相コンデンサ（以下コンデ
ンサという）を接続する場合、これを母線に接続
したままにすると夜間、休日など軽負荷時、無負
荷時には著しく進み力率となり、電圧過昇などい
ろいろな不都合を生じるため、負荷の変動に応じ
てコンデンサを挿脱することが推奨される。従
来、負荷変動に応じてコンデンサを挿脱する方法
として、例えば第１図に示すように個々の負荷
M₁〜M₅にそれぞれコンデンサC₁〜C₅を直結し、
開閉器S₁〜S₅により負荷開放と共にコンデンサも
母線１より開放される方式があるが、この場合は
コンデンサが小容量のものが多数必要となり、ま
た負荷停止時コンデンサも休止するためにコンデ
ンサの利用率も低くなり経済的に不利である。ま
た第２図のように計器用変圧器２、変流器３によ
り電圧、電流を検出して無効電力継電器４を動作
させ、コンデンサC₁，C₂の開閉器SC₁，SC₂を操
作する方式も広く使用されているが、計器用変圧
器２、変流器３、無効電力継電器４と高価な設備
を要する難点があつた。 In general, when connecting a power factor improvement phase advance capacitor (hereinafter referred to as a capacitor), if it is left connected to the bus bar, the power factor will advance significantly during light loads such as nighttime and holidays, and when there is no load, resulting in various problems such as voltage overrise. To avoid this problem, it is recommended to insert and remove capacitors according to load fluctuations. Conventionally, as a method of inserting and removing capacitors according to load fluctuations, for example, as shown in Figure 1,
Connect capacitors C ₁ to _{C 5} directly to M ₁ to M ₅ , respectively.
There is a method in which the capacitor is also opened from bus 1 when the load is opened using switches S ₁ to _{S 5} , but in this case, a large number of small capacitors are required, and the capacitors are also stopped when the load is stopped, so the capacitor is The utilization rate is also low, which is economically disadvantageous. Also, as shown in Fig. 2, the voltage and current are detected by the instrument transformer 2 and current transformer 3 to operate the reactive power relay 4 and operate the switches SC ₁ and SC ₂ of the capacitors C ₁ and C ₂ . Although this method is widely used, it has the disadvantage that it requires expensive equipment such as a voltage transformer 2, a current transformer 3, and a reactive power relay 4.

本考案は上述の欠点を除去し、最も簡単安価な
方法で負荷に応じてコンデンサを自動制御するこ
とを目的とするコンデンサ自動制御装置である。
本装置はそれぞれの負荷の開閉器の補助接点を利
用してコンデンサの投入、開放の操作信号を得る
ものであり、その実施例を第３図および第４図に
より説明する。 The present invention is an automatic capacitor control device which aims to eliminate the above-mentioned drawbacks and automatically control the capacitor according to the load in the simplest and cheapest way.
This device uses the auxiliary contacts of the respective load switches to obtain operation signals for closing and opening capacitors, and an embodiment thereof will be explained with reference to FIGS. 3 and 4.

第３図の例は母線１に負荷M₁〜M₅が接続され
ており、しかもそれぞれ開閉器S₁〜S₅により開閉
される。またコンデンサC₁も同一母線に接続さ
れ、これは開閉器SC₁により開閉され、この開閉
器SC₁は本考案の自動制御装置５により操作され
る。 In the example of FIG. 3, loads M ₁ to M ₅ are connected to the bus 1, and are opened and closed by switches S ₁ to S ₅ , respectively. A capacitor C ₁ is also connected to the same busbar, and is opened and closed by a switch SC ₁ , which is operated by the automatic control device ₅ of the present invention.

第４図はこの自動制御装置５の内部接続例を示
すものであり、負荷の開閉器S₁〜S₅の補助接点の
投入時閉接点１１ａ〜１５ａを直列接続とし、開
路時閉接点１１ｂ〜１５ｂを直列接続とし、それ
ぞれに電磁継電器Ａ，Ｂを直列接続としている。
接点１１ａ〜１５ａにはそれぞれ並列に側路スイ
ツチAS₁〜AS₅を、接点１１ｂ〜１５ｂにはそれ
ぞれ並列に側路スイツチBS₁〜BS₅を設ける。
Ｐ，Ｎは操作電源に接続される。今、側路スイツ
チAS₁〜AS₅，BS₁〜BS₅がすべて開放の場合を
考えると、開閉器SC₁が機械的保持式操作の場
合、開閉器S₁〜S₅のすべてを投入したとき、電磁
継電器Ａは励磁され、これの接点信号により開閉
器SC₁の投入コイルCCは励磁され、開閉器SC₁は
投入されてコンデンサC₁が接続される。また開
閉器S₁〜S₅のすべてが開放されると、電磁継電器
Ｂは励磁され、これの接点信号により開閉器SC₁
の引外しコイルTCは励磁され、開閉器SC₁は開
放され、コンデンサC₁は母線１より切り放され
る。開閉器SC₁が機械的保持式操作でなく、常時
励磁式操作の場合は機械的保持式の補助継電器を
使用するか、又は開閉器SC₁の自己保持回路を電
磁継電器Ｂの動作時開接点を使用して開路する方
法を使用すればよい。もし負荷M₁，M₂が投入さ
れたときコンデンサを投入し、他の負荷は関係な
くM₁が開放されたとき、コンデンサを開放した
場合には側路スイツチをAS₁，AS₂，BS₁を除い
て閉路しておけばよい。 FIG. 4 shows an example of internal connections of this automatic control device 5, in which the closing contacts 11a to 15a of the auxiliary contacts of the load switches _S1 to _S5 are connected in series, and the closing contacts 11b to 15a of the load switches S1 to S5 are connected in series. 15b are connected in series, and electromagnetic relays A and B are connected in series to each.
Bypass switches AS ₁ to AS ₅ are provided in parallel to the contacts 11a to 15a, respectively, and bypass switches BS ₁ to BS ₅ are provided in parallel to the contacts 11b to 15b, respectively.
P and N are connected to the operating power source. Now, considering the case where all of the sideway switches AS ₁ to AS ₅ and BS ₁ to BS ₅ are open, if switch SC ₁ is mechanically held, all switches S ₁ to _{S 5} are closed. At this time, the electromagnetic relay A is energized, and the contact signal from this energizes the closing coil CC of the switch SC ₁ , which closes the switch SC ₁ and connects the capacitor C ₁ . Furthermore, when all of the switches S ₁ to _{S 5} are opened, the electromagnetic relay B is energized, and the contact signal of the electromagnetic relay B causes the switch SC ₁ to open.
The tripping coil TC is excited, the switch SC ₁ is opened, and the capacitor C ₁ is disconnected from the bus 1. If switch SC ₁ is not operated mechanically but is operated by constant excitation, use a mechanically held auxiliary relay or connect the self-holding circuit of switch SC ₁ to the operating open contact of electromagnetic relay B. You can use the method of opening the circuit using . If the capacitor is turned on when the loads M ₁ and M ₂ are turned on, and when M ₁ is opened regardless of other loads, the bypass switch is turned on when the capacitor is opened, AS ₁ , AS ₂ , BS ₁ It is sufficient to keep the circuit closed except for .

本装置を利用すれば従来の無効電力継電方式の
ように高価な計器用変圧器や変流器を使用する必
要もなく、きわめて簡単な方法でコンデンサの開
閉を自動制御することができる。また側路スイツ
チにより対応させる負荷を任意に選定することが
でき、利用効果大である。 By using this device, it is possible to automatically control the opening and closing of capacitors in an extremely simple manner without the need for expensive voltage transformers or current transformers unlike conventional reactive power relay systems. In addition, the load to be handled by the side road switch can be arbitrarily selected, which is highly effective.

実施例としてコンデンサ１群のみの例を示した
が、第４図に示す制御装置を２組以上使用するこ
とによりコンデンサを２群以上制御できることは
勿論である。 Although only one group of capacitors has been shown as an example, it is of course possible to control two or more groups of capacitors by using two or more sets of control devices shown in FIG.

【図面の簡単な説明】[Brief explanation of drawings]

第１図、第２図は従来の力率改善用進相コンデ
ンサ制御の電気系統の説明図、第３図は本考案の
力率改善用進相コンデンサ自動制御装置の一実施
例の電気系統の説明図、第４図は本考案の力率改
善用進相コンデンサ自動制御装置の内部接続例を
示す説明図である。 S₁，S₂…S₅……負荷の開閉器、１１ａ，１２ａ
…１５ａ……補助接点の投入時閉接点、１１ｂ，
１２ｂ…１５ｂ……補助接点の開路時閉接点、
AS₁，AS₂…AS₅，BS₁，BS₂…BS₅……側路スイ
ツチ、M₁，M₂…M₅……負荷、Ａ，Ｂ……電磁
継電器、SC₁……コンデンサの開閉器、CC……
開閉器SC₁の投入コイル、TC……開閉器SC₁の引
外しコイル。 Figures 1 and 2 are explanatory diagrams of the electrical system of conventional power factor improvement phase advance capacitor control, and Figure 3 is an illustration of the electrical system of an embodiment of the power factor improvement phase advance capacitor automatic control device of the present invention. FIG. 4 is an explanatory diagram showing an example of internal connections of the power factor improving phase advance capacitor automatic control device of the present invention. S ₁ , S ₂ ...S ₅ ...Load switch, 11a, 12a
...15a... Auxiliary contact closed contact when closed, 11b,
12b...15b...Auxiliary contact's open/close contact,
AS ₁ , AS ₂ ... AS ₅ , BS ₁ , BS ₂ ... BS ₅ ... Side switch, M ₁ , M ₂ ... M ₅ ... Load, A, B ... Electromagnetic relay, SC ₁ ... Switching of capacitor Vessel, CC...
Closing coil of switch SC ₁ , TC...Tripping coil of switch SC ₁ .

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 負荷に並列接続した進相コンデンサを開閉して
力率を改善する力率改善用進相コンデンサ自動制
御装置において、複数個の負荷の各々の開閉器の
補助接点の投入時閉接点と開路時閉接点をそれぞ
れ直列接続し、負荷用開閉器の投入および開放に
応じてコンデンサの投入および開放信号を得るよ
うにし、かつそれぞれの接点に側路スイツチを設
けて任意の負荷の投入、開放に応じてコンデンサ
を投入、開放できるように構成したことを特徴と
する力率改善用進相コンデンサ自動制御装置。 In a power factor improvement phase advance capacitor automatic control device that improves the power factor by opening and closing a phase advance capacitor connected in parallel to the load, the auxiliary contact of each switch of multiple loads is closed when closed and closed when opened. The contacts are connected in series to obtain capacitor closing and opening signals in response to the closing and opening of the load switch, and each contact is provided with a bypass switch so that the capacitor can be turned on and off in response to the closing and opening of any load. An automatic control device for a phase advance capacitor for power factor improvement, characterized in that the capacitor is configured to be able to close and open the capacitor.