JPS6362074B2 - - Google Patents
Info
- Publication number
- JPS6362074B2 JPS6362074B2 JP11486281A JP11486281A JPS6362074B2 JP S6362074 B2 JPS6362074 B2 JP S6362074B2 JP 11486281 A JP11486281 A JP 11486281A JP 11486281 A JP11486281 A JP 11486281A JP S6362074 B2 JPS6362074 B2 JP S6362074B2
- Authority
- JP
- Japan
- Prior art keywords
- protection element
- overvoltage protection
- load
- constant current
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004804 winding Methods 0.000 claims description 28
- 230000006866 deterioration Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明は、定電流電源の負荷開放時に発生する
過電圧を抑制する過電圧保護素子の劣化及び動作
を監視する過電圧保護素子の監視方式に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overvoltage protection element monitoring method for monitoring the deterioration and operation of an overvoltage protection element that suppresses overvoltage generated when a constant current power source is unloaded.
定電流電源は、同軸ケーブル伝送方式の中継器
への電力供給やその他負荷に一定電流を供給する
為に用いられており、負荷開放時には定電流電源
の出力端子に過電圧が発生する。この過電圧を抑
制する為に、アレスタ等の過電圧保護素子が設け
られているものである。この過電圧保護素子に流
れる電流を検出して、過電圧保護素子の劣化及び
負荷開放時の動作を監視するのが一般的である。 A constant current power supply is used to supply power to a repeater using a coaxial cable transmission system and to supply a constant current to other loads, and when the load is opened, an overvoltage occurs at the output terminal of the constant current power supply. In order to suppress this overvoltage, an overvoltage protection element such as an arrester is provided. Generally, the current flowing through the overvoltage protection element is detected to monitor the deterioration of the overvoltage protection element and the operation when the load is released.
例えば第１図に示すように、定電流電源１から
負荷２に定電流を供給する端子間に、アレスタ等
の過電圧保護素子３とメータ、リレー、抵抗等の
素子４とを接続し、この素子４により過電圧保護
素子３に流れる電流を検出し、定電流電源１の出
力を制御するものであつた。従つて定電流電源１
から定電流Ioを供給する負荷２のインピーダンス
が大きくなると、出力電圧Voも増大し、負荷２
が開放又はそれに近い状態となると、出力電圧
Voは過電圧保護素子３の動作電圧以上となり、
過電圧保護素子３に電流が流れて出力電圧Voの
増大と抑制する。 For example, as shown in FIG. 1, an overvoltage protection element 3 such as an arrester and an element 4 such as a meter, relay, or resistor are connected between the terminals that supply constant current from a constant current power source 1 to a load 2, and this element 4 detects the current flowing through the overvoltage protection element 3 and controls the output of the constant current power supply 1. Therefore, constant current power supply 1
When the impedance of load 2 that supplies constant current Io increases, the output voltage Vo also increases, and load 2
When the output voltage becomes open or close to it, the output voltage
Vo becomes higher than the operating voltage of overvoltage protection element 3,
A current flows through the overvoltage protection element 3 to increase and suppress the output voltage Vo.
しかし、第２図に示すように、出力電圧Voが
過電圧保護素子３の動作電圧Va以上となつたと
き、過電圧保護素子３及びメータ等の素子４に電
流が流れ、過電圧保護素子３の動作抵抗による電
圧降下ａ及びメータ等の素子４の抵抗による電圧
降下ｂとが加算された値の出力電圧が負荷２に印
加されることになる。即ち負荷開放時の過電圧を
充分に抑制することができなかつた。 However, as shown in FIG. 2, when the output voltage Vo exceeds the operating voltage Va of the overvoltage protection element 3, current flows through the overvoltage protection element 3 and elements 4 such as meters, and the operating resistance of the overvoltage protection element 3 increases. An output voltage that is the sum of the voltage drop a caused by the voltage drop a and the voltage drop b caused by the resistance of the element 4 such as a meter is applied to the load 2. That is, it was not possible to sufficiently suppress overvoltage when the load was released.
本発明は、前述の如き従来の欠点を改善したも
ので、定電流電源の過電圧を充分に抑制すると共
に、過電圧保護素子の劣化及び動作を監視し得る
ようにすることを目的とするものである。以下実
施例について詳細に説明する。 The present invention improves the conventional drawbacks as described above, and aims to sufficiently suppress the overvoltage of a constant current power supply and to monitor the deterioration and operation of the overvoltage protection element. . Examples will be described in detail below.
第３図は本発明の一実施例のブロツク線図であ
り、定電流電源１から負荷２に定電流を供給する
構成に於いて、定電流電源１と負荷２との間に巻
線５，６を接続し、定電流電源１から負荷２に流
れる電流に対して巻線５，６の巻回方向は反対方
向となつている。又巻線５，６の接続点に過電圧
保護素子３が接続され、巻線５，６と磁気的に結
合されている巻線７は監視回路８に接続され、巻
線５〜７により電流検出器が構成されている。 FIG. 3 is a block diagram of an embodiment of the present invention, in which a constant current is supplied from a constant current power source 1 to a load 2, and a winding 5 is connected between the constant current power source 1 and the load 2. 6 is connected, and the winding direction of the windings 5 and 6 is opposite to the current flowing from the constant current power source 1 to the load 2. In addition, an overvoltage protection element 3 is connected to the connection point of the windings 5 and 6, and a winding 7 that is magnetically coupled to the windings 5 and 6 is connected to a monitoring circuit 8, and the current is detected by the windings 5 to 7. The vessel is configured.
巻線５〜７の巻回数をN11，N12，N2とし、過
電圧保護素子３の非動作時の巻線５，６に流れる
電流をIo、巻線７に流れる電流をIsとすると、
N2・Is＝N12・Io−N11・Io …(1)
が成立する。又過電圧保護素子３に電流Iaが流れ
ると、巻線５には電流Io、巻線６にはIo―Iaの電
流が流れるので、
N2・Is＝N12（Io−Ia）−N11・Io …(2)
が成立する。ここでN11＝N12とすると、(1)式が
成立するとき、Is＝０となり、(2)式が成立すると
きIs＝−N11／N2・Iaとなる。即ち過電圧保護素子３
に流れる電流Iaを巻線７に流れる電流Isによつて
検出することができる。 Let the number of turns of the windings 5 to 7 be N 11 , N 12 , N 2 , the current flowing through the windings 5 and 6 when the overvoltage protection element 3 is not operating is Io, and the current flowing through the winding 7 is Is. N 2・Is=N 12・Io−N 11・Io…(1) holds true. Also, when current Ia flows through overvoltage protection element 3, current Io flows through winding 5, and current Io−Ia flows through winding 6, so N 2・Is=N 12 (Io−Ia)−N 11・Io…(2) holds true. Here, if N 11 =N 12 , then when equation (1) holds, Is=0, and when equation (2) holds, Is=-N 11 /N 2 ·Ia. That is, the current Ia flowing through the overvoltage protection element 3 can be detected by the current Is flowing through the winding 7.
従つて過電圧保護素子３の劣化により電流Iaが
流れた場合、及び負荷２の開放状態による過電圧
により電流Iaが流れた場合、監視回路８は巻線７
に流れる電流Isにより検出することができ、定電
流電源１の出力を制御することができる。又過電
圧保護素子３と負荷２とは、負荷２に巻線６が直
列に接続されて過電圧保護素子３に並列に接続さ
れた構成となり、負荷開放時には定電流Ioが過電
圧保護素子３に流れ、第４図に示すように、過電
圧保護素子３の動作電圧Vaに動作抵抗による電
圧降下ａが加算された値に出力電圧Voが抑制さ
れ、従来例の素子４による電圧降下ｂが無いこと
によつて、過電圧の抑制を効果的に行なうことが
できることになる。 Therefore, when current Ia flows due to deterioration of overvoltage protection element 3 or when current Ia flows due to overvoltage caused by open state of load 2, monitoring circuit 8
It can be detected by the current Is flowing through the constant current power supply 1, and the output of the constant current power supply 1 can be controlled. The overvoltage protection element 3 and the load 2 have a configuration in which the winding 6 is connected in series to the load 2 and connected in parallel to the overvoltage protection element 3, and when the load is opened, a constant current Io flows to the overvoltage protection element 3. As shown in FIG. 4, the output voltage Vo is suppressed to the value obtained by adding the voltage drop a caused by the operating resistance to the operating voltage Va of the overvoltage protection element 3, and there is no voltage drop b caused by the element 4 of the conventional example. Therefore, overvoltage can be effectively suppressed.
第５図は本発明の他の実施例を示し、電流検出
器として２巻線式メータ９を用いた場合について
のものである。この２巻線式メータ９は、各巻線
１０，１１に流れる電流が等しいときにアンペア
ターンが等しくなつて動作しないが、各巻線１
０，１１に流れる電流が異なるとき、アンペアタ
ーンが相違するので動作することになるものであ
る。従つて定電流電源１から負荷２に定電流を供
給し、過電圧保護素子３に電流が流れていないと
きは、２線式メータ９は動作しないが、過電圧保
護素子３の劣化又は負荷開放による過電圧で過電
圧保護素子３に電流が流れると、２巻線式メータ
９が動作することになる。又過電圧保護素子３と
負荷２とは第３図に示す実施例と同様な接続構成
となるので、過電圧保護素子３により負荷開放時
の過電圧を充分に抑制することができる。 FIG. 5 shows another embodiment of the present invention, in which a two-winding meter 9 is used as the current detector. This two-winding meter 9 does not operate because the ampere turns become equal when the current flowing through each winding 10 and 11 is equal.
When the currents flowing through the terminals 0 and 11 are different, the ampere turns are different, so it will operate. Therefore, when a constant current is supplied from the constant current power supply 1 to the load 2 and no current flows through the overvoltage protection element 3, the two-wire meter 9 will not operate, but overvoltage due to deterioration of the overvoltage protection element 3 or load opening will occur. When current flows through the overvoltage protection element 3, the two-winding meter 9 operates. Moreover, since the overvoltage protection element 3 and the load 2 have a connection configuration similar to that of the embodiment shown in FIG. 3, the overvoltage protection element 3 can sufficiently suppress overvoltage when the load is opened.
以上説明したように、本発明は、定電流電源１
の一方の出力端子と過電圧保護素子３の一端子と
負荷２の一端子とを接続し、定電流電源１の他方
の出力端子と過電圧保護素子３の他端子との間及
びこの他端子と負荷２の他端子との間にそれぞれ
電流検出器の巻線５，６又は１０，１１を接続
し、過電圧保護素子３に電流が流れないときは、
巻線５又は１０と巻線６又は１１に流れる電流は
等しくなるが、過電圧保護素子３の劣化又は負荷
開放時の過電圧により電流が流れると、巻線５又
は１０と巻線６又は１１に流れる電流に差が生
じ、それを検出することにより過電圧保護素子３
の劣化又は動作を監視することができるものであ
り、又負荷開放時の過電圧は、過電圧保護素子３
には、直列のインピーダンスが接続されていない
ので、過電圧保護素子３の動作抵抗で定まる電圧
降下分の上昇で済むように抑制されることにな
り、この電圧降下分は僅かであるから、過電圧を
充分に抑制することができることになる。 As explained above, the present invention provides a constant current power supply 1
Connect one output terminal of the constant current power supply 1 to one terminal of the overvoltage protection element 3 and one terminal of the load 2. When the windings 5, 6 or 10, 11 of the current detector are connected between the other terminals of 2 and no current flows through the overvoltage protection element 3,
The current flowing through the winding 5 or 10 and the winding 6 or 11 will be equal, but if current flows due to deterioration of the overvoltage protection element 3 or overvoltage when the load is opened, the current will flow through the winding 5 or 10 and the winding 6 or 11. A difference occurs in the current, and by detecting it, the overvoltage protection element 3
It is possible to monitor the deterioration or operation of the overvoltage protection element 3.
Since no series impedance is connected to the overvoltage protection element 3, the voltage drop determined by the operating resistance of the overvoltage protection element 3 is suppressed to an increase. This means that it can be suppressed sufficiently.
第１図は従来の過電圧保護素子の監視の為のブ
ロツク線図、第２図はその出力電圧と出力電流と
の特性説明図、第３図は本発明の一実施例のブロ
ツク線図、第４図はその出力電圧と出力電流との
特性説明図、第５図は本発明の実施例のブロツク
線図である。
１は定電流電源、２は負荷、５〜７は巻線、８
は監視回路、９は２巻線式メータ、１０，１１は
巻線である。
Fig. 1 is a block diagram for monitoring a conventional overvoltage protection element, Fig. 2 is an explanatory diagram of its output voltage and output current characteristics, and Fig. 3 is a block diagram of an embodiment of the present invention. FIG. 4 is an explanatory diagram of the characteristics of the output voltage and output current, and FIG. 5 is a block diagram of an embodiment of the present invention. 1 is a constant current power supply, 2 is a load, 5 to 7 are windings, 8
9 is a monitoring circuit, 9 is a two-winding meter, and 10 and 11 are windings.
Claims (1)
子に過電圧保護素子を接続し、該過電圧保護素子
に流れる電流を監視する方式に於いて、前記定電
流電源の一方の出力端子と前記過電圧保護素子の
一端子と前記負荷の一端子とを接続し、前記定電
流電源の他方の出力端子と前記過電圧保護素子の
他端子との間及び該他端子と前記負荷の他端子と
の間にそれぞれ巻線を接続し、各巻線に流れる電
流の差により前記過電圧保護素子に流れる電流を
検出して、前記過電圧保護素子の劣化及び動作を
監視することを特徴とする過電圧保護素子の監視
方式。1. In a method in which an overvoltage protection element is connected to the output terminal of a constant current power supply that supplies a constant current to a load, and the current flowing through the overvoltage protection element is monitored, one output terminal of the constant current power supply and the overvoltage protection element are connected. One terminal of the element and one terminal of the load are connected, and between the other output terminal of the constant current power supply and the other terminal of the overvoltage protection element, and between the other terminal and the other terminal of the load, respectively. A monitoring method for an overvoltage protection element, characterized in that windings are connected and a current flowing through the overvoltage protection element is detected based on a difference in current flowing through each winding to monitor deterioration and operation of the overvoltage protection element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11486281A JPS5819124A (en) | 1981-07-22 | 1981-07-22 | System for monitoring overvoltage protecting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11486281A JPS5819124A (en) | 1981-07-22 | 1981-07-22 | System for monitoring overvoltage protecting element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5819124A JPS5819124A (en) | 1983-02-04 |
| JPS6362074B2 true JPS6362074B2 (en) | 1988-12-01 |
Family
ID=14648554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11486281A Granted JPS5819124A (en) | 1981-07-22 | 1981-07-22 | System for monitoring overvoltage protecting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5819124A (en) |
-
1981
- 1981-07-22 JP JP11486281A patent/JPS5819124A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5819124A (en) | 1983-02-04 |
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