JP5552362B2 - Electronic circuit breaker that counts the duration of overcurrent - Google Patents

Electronic circuit breaker that counts the duration of overcurrent Download PDF

Info

Publication number
JP5552362B2
JP5552362B2 JP2010112016A JP2010112016A JP5552362B2 JP 5552362 B2 JP5552362 B2 JP 5552362B2 JP 2010112016 A JP2010112016 A JP 2010112016A JP 2010112016 A JP2010112016 A JP 2010112016A JP 5552362 B2 JP5552362 B2 JP 5552362B2
Authority
JP
Japan
Prior art keywords
value
count value
overcurrent
circuit breaker
duration
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.)
Active
Application number
JP2010112016A
Other languages
Japanese (ja)
Other versions
JP2011243319A (en
Inventor
功次 小西
Original Assignee
河村電器産業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 河村電器産業株式会社 filed Critical 河村電器産業株式会社
Priority to JP2010112016A priority Critical patent/JP5552362B2/en
Publication of JP2011243319A publication Critical patent/JP2011243319A/en
Application granted granted Critical
Publication of JP5552362B2 publication Critical patent/JP5552362B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Breakers (AREA)

Description

本発明は、CPUが過電流の継続時間をカウントし、カウント値が閾値に達したときに、遮断機構が主接点を引き外す電子式の配線用遮断器に関する。   The present invention relates to an electronic circuit breaker in which a CPU counts the duration of an overcurrent and a breaking mechanism trips a main contact when the count value reaches a threshold value.

従来、過電流の判定、過電流継続時間のカウントおよび遮断機構の制御をCPUで行う配線用遮断器が知られている。例えば、特許文献1に記載された遮断器は、線路電流を変流器で検出し、CPUが変流器の出力に基づいて過電流を判定し、その継続時間をカウントし、カウント値が上限値に達したとき、遮断機構にトリップ指令を出力し、線路電流が下限値以下になると、継続時間のカウント値をリセットするように構成されている。   2. Description of the Related Art Conventionally, a circuit breaker for wiring is known in which a CPU performs overcurrent determination, overcurrent continuation time counting, and interruption mechanism control. For example, the circuit breaker described in Patent Document 1 detects a line current with a current transformer, the CPU determines an overcurrent based on the output of the current transformer, counts the duration, and the count value is the upper limit. When the value is reached, a trip command is output to the interruption mechanism, and when the line current becomes lower than the lower limit value, the count value of the duration time is reset.

特開平11−205999号公報Japanese Patent Laid-Open No. 11-205999

ところが、従来の配線用遮断器によると、非通電状態を含め線路電流が下限値以下になったときに、過電流継続時間のカウント値をリセットするので、過電流の発生により、主接点が開放状態になると、継続時間のカウント値が0となる。しかし、過電流に伴う熱が電線に残っているため、ユーザーが電気設備の改善をしないまま電源を再投入した場合に、次の遮断までに前回と同じ時間を要し、遮断機構を動作させるタイミングが遅れ、電線の発熱量が増し、配線路が危険な状態になる。   However, according to the conventional circuit breaker for wiring, the count value of the overcurrent duration is reset when the line current falls below the lower limit value including the non-energized state, so the main contact is opened due to the occurrence of overcurrent. When the state is reached, the count value of the duration time becomes zero. However, because the heat accompanying the overcurrent remains in the electric wire, if the user turns on the power again without improving the electrical equipment, it takes the same time as the previous time until the next interruption, and the interruption mechanism is activated. The timing is delayed, the amount of heat generated by the wires increases, and the wiring path becomes dangerous.

この点に鑑み、本願と同じ出願人は、先の特許出願(特願2009−157808号)において、遮断直前のカウント値を配線路の熱履歴として残し、電源再投入後の過電流監視処理に利用する技術を提案した。具体的には、図5に示すように、カウント値が閾値に達したとき、現在のカウント値を不揮発性記憶部に書き込んだ後に主接点を引き外す。電源が再投入されると、記憶部より読み出したカウント値から所定値を減算し、この値を初期値として過電流継続時間をカウントする。所定値には、接点引き外しから電源再投入までの放熱時間を想定した値が用いられている。   In view of this point, the same applicant as the present application, in the previous patent application (Japanese Patent Application No. 2009-157808), leaves the count value immediately before the interruption as the thermal history of the wiring path, and performs the overcurrent monitoring process after the power is turned on again. The technology to use was proposed. Specifically, as shown in FIG. 5, when the count value reaches a threshold value, the main contact is removed after the current count value is written to the nonvolatile storage unit. When the power is turned on again, a predetermined value is subtracted from the count value read from the storage unit, and the overcurrent duration is counted using this value as an initial value. As the predetermined value, a value assuming a heat radiation time from contact removal to power-on is used.

しかし、配線路に定格電流を超えた電流が流れると、電線の発熱温度は急激に上昇する。このため、図6に示すように、想定した放熱時間よりも短い時間で電源が再投入されると、定格電流を大きく超えた過電流が繰り返し流れ、蓄熱によって電線温度が許容温度を超える可能性がある。また、図7に示すように、想定放熱時間よりも長い時間で電源が再投入された場合は、異常発熱の心配はないが、電線温度にまだ余裕がある段階で、遮断機構がトリップ動作するという不都合もある。   However, when a current exceeding the rated current flows through the wiring path, the heat generation temperature of the wire rapidly increases. For this reason, as shown in FIG. 6, when the power is turned on again in a shorter time than the assumed heat dissipation time, an overcurrent greatly exceeding the rated current repeatedly flows, and the electric wire temperature may exceed the allowable temperature due to heat storage. There is. Also, as shown in FIG. 7, when the power is turned on again for a longer time than the assumed heat dissipation time, there is no worry of abnormal heat generation, but the shutoff mechanism trips when there is still room in the wire temperature. There is also an inconvenience.

そこで、本発明の目的は、電線の発熱状況に即して遮断機構を適時に動作させ、より安全な過電流保護を実現できる配線用遮断器を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a wiring breaker that can realize a safer overcurrent protection by operating a breaking mechanism in a timely manner in accordance with the heat generation state of an electric wire.

上記課題を解決するため、本発明は、CPUが配線路に流れる過電流の継続時間をカウントし、カウント値が閾値に達したときに、遮断機構が配線路上の主接点を引き外す配線用遮断器において、 遮断器ケースの内部温度を検出する温度センサと不揮発性記憶部とを備え、CPUが、カウント値が閾値に達したら不揮発性記憶部にカウント値と温度検出値を記憶し、その後主接点の引外しを実施し、電源の再投入後に、不揮発性記憶部から引外し前のカウント値と温度検出値を読み出し、引外し前の温度検出値と現在の温度検出値との差分値に比例する補正量を算出して、当該補正量で引外し前のカウント値を減算し、減算後のカウント値を初期値として過電流の継続時間をカウントすることを特徴とする。 In order to solve the above-mentioned problem, the present invention counts the duration of overcurrent flowing through the wiring path, and when the count value reaches a threshold, the blocking mechanism trips the main contact on the wiring path. in vessels, and a temperature sensor and a nonvolatile memory unit for detecting the internal temperature of the circuit breaker case, CPU may store the count value and the detected temperature value in the nonvolatile storage unit When the count value reaches the threshold value, then the main After tripping the contact and turning on the power again, the count value and temperature detection value before tripping are read from the non-volatile memory, and the difference value between the temperature detection value before tripping and the current temperature detection value is read. A proportional correction amount is calculated, the count value before tripping is subtracted by the correction amount, and the overcurrent duration is counted using the count value after subtraction as an initial value.

本発明の配線用遮断器によれば、電源再投入時のカウント初期値を配線路の温度検出値に基づいて補正しているので、電線の発熱状況に即して遮断機構を適時に動作させ、より安全な過電流保護を実現できるという効果がある。   According to the circuit breaker of the present invention, the initial count value when the power is turned on again is corrected based on the temperature detection value of the wiring path. There is an effect that safer overcurrent protection can be realized.

本発明の一実施形態を示す配線用遮断器のブロック図である。It is a block diagram of the circuit breaker for wiring which shows one Embodiment of this invention. CPUによる過電流監視処理を示すフローチャートである。It is a flowchart which shows the overcurrent monitoring process by CPU. 放熱時間が短い場合の過電流監視処理を示すグラフである。It is a graph which shows the overcurrent monitoring process in case heat dissipation time is short. 放熱時間が長い場合の過電流監視処理を示すグラフである。It is a graph which shows the overcurrent monitoring process in case heat dissipation time is long. 関連技術の過電流監視処理を示すグラフである。It is a graph which shows the overcurrent monitoring process of related technology. 過電流の繰り返しによる異常発熱を示すグラフである。It is a graph which shows abnormal heat_generation | fever by repetition of an overcurrent. 遮断機構のトリップ時期尚早を示すグラフである。It is a graph which shows the trip premature of the interruption | blocking mechanism.

以下、本発明の一実施形態を図面に基づいて説明する。図1に示すように、この実施形態の配線用遮断器1は、トリップコイル2と駆動回路3で遮断機構を構成し、CPU7からのトリップ指令に応答して、三相三線式配線路4上の主接点5を引き外す。配線路4には、線路電流を検出する電流センサ6と、CPU7の動作電圧を主接点5の二次側から取り出す電源回路8とが設けられている。遮断器ケース(図示略)には、ユーザーが操作する手動ハンドル(図示略)と、配線路4の温度と同期して変化する遮断器ケースの内部温度を検出するサーミスタ等からなる温度センサ9とが設けられている。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the circuit breaker 1 of this embodiment comprises a trip mechanism 2 and a drive circuit 3, and in response to a trip command from the CPU 7, on the three-phase three-wire wiring path 4. Pull off the main contact 5. The wiring path 4 is provided with a current sensor 6 that detects a line current and a power supply circuit 8 that extracts the operating voltage of the CPU 7 from the secondary side of the main contact 5. The circuit breaker case (not shown) includes a manual handle (not shown) operated by the user, a temperature sensor 9 including a thermistor for detecting the internal temperature of the circuit breaker case that changes in synchronization with the temperature of the wiring path 4, and the like. Is provided.

CPU7には、A/D変換部10、制御プログラム11、データ記憶部12、演算制御部13、入/出力部14が設けられている。A/D変換部10は電流センサ6と温度センサ9に接続され、入/出力部14が駆動回路3と不揮発性記憶部15に接続されている。そして、演算制御部13は、制御プログラム11に従い、データ記憶部12の各種パラメータを用いて、配線路4の過電流を判定し、過電流の継続時間をカウントし、カウント値が閾値に達したときに、トリップ指令を駆動回路3に出力するようになっている。   The CPU 7 is provided with an A / D conversion unit 10, a control program 11, a data storage unit 12, a calculation control unit 13, and an input / output unit 14. The A / D conversion unit 10 is connected to the current sensor 6 and the temperature sensor 9, and the input / output unit 14 is connected to the drive circuit 3 and the nonvolatile storage unit 15. Then, according to the control program 11, the arithmetic control unit 13 determines the overcurrent of the wiring path 4 using various parameters of the data storage unit 12, counts the duration of the overcurrent, and the count value reaches the threshold value. Sometimes, a trip command is output to the drive circuit 3.

次に、配線用遮断器1の動作について説明する。配線路4の通電状態において、CPU7は、図2に示す過電流監視処理を実行し、まず、電流センサ6の出力を監視し、過電流判定用の閾値を用いて、配線路4の過電流状態を判定する(S11)。過電流状態を判定したときには、過電流の継続時間を加算し(S12)、加算後のカウント値が継続時間判定用の閾値に達したかどうかを判断する(S13)。カウント値が閾値に達すると、この時点のカウント値と温度センサ9の温度検出値を不揮発性記憶部15に記憶する(S14)。その後、駆動回路3にトリップ指令を出力し(S15)、トリップコイル2が主接点5を引き外す。なお、配線路4が過電流状態でなくなったときには、過電流の継続時間を減算し(S16)、減算後のカウント値が0以上であれば(S17:No)、過電流判定処理(S11)に復帰し、減算後のカウント値が0未満であれば(S17:Yes)、カウント値を0にした後に(S18)、過電流判定処理(S11)に復帰する。   Next, the operation of the circuit breaker 1 for wiring will be described. In the energized state of the wiring path 4, the CPU 7 executes the overcurrent monitoring process shown in FIG. 2, first monitors the output of the current sensor 6, and uses the overcurrent determination threshold value to detect the overcurrent of the wiring path 4. The state is determined (S11). When the overcurrent state is determined, the overcurrent duration is added (S12), and it is determined whether the count value after the addition has reached a threshold for determining the duration (S13). When the count value reaches the threshold value, the count value at this point and the temperature detection value of the temperature sensor 9 are stored in the nonvolatile storage unit 15 (S14). Thereafter, a trip command is output to the drive circuit 3 (S15), and the trip coil 2 pulls off the main contact 5. When the wiring path 4 is no longer in an overcurrent state, the overcurrent duration is subtracted (S16). If the count value after subtraction is 0 or more (S17: No), an overcurrent determination process (S11). If the count value after subtraction is less than 0 (S17: Yes), after the count value is set to 0 (S18), the process returns to the overcurrent determination process (S11).

ユーザーが手動ハンドルで電源を再投入すると、CPU7は、まず、カウンタ(図示略)をリセットするなどの初期化を行う(S21)。次に、不揮発性記憶部15から引外し前のカウント値と温度検出値を読み出す(S22)。続いて、引外し前の温度検出値と温度センサ9が出力した現在の温度検出値を比較し(S23)、両方の温度検出値の差分値に比例する(定数kを掛ける)補正量を算出する(S24)。そして、引外し前のカウント値から補正量を減算し(S25)、減算結果を電源再投入後のカウント初期値としてカウンタに保存する(S26)。その後、過電流監視処理に復帰し(S11)、補正後のカウント値を初期値として過電流の継続時間をカウントする(S12)。   When the user turns on the power again with the manual handle, the CPU 7 first performs initialization such as resetting a counter (not shown) (S21). Next, the count value and the temperature detection value before tripping are read from the nonvolatile storage unit 15 (S22). Subsequently, the temperature detection value before tripping is compared with the current temperature detection value output by the temperature sensor 9 (S23), and a correction amount proportional to the difference value between the two temperature detection values (multiply by a constant k) is calculated. (S24). Then, the correction amount is subtracted from the count value before tripping (S25), and the subtraction result is stored in the counter as the count initial value after power-on (S26). Thereafter, the process returns to the overcurrent monitoring process (S11), and the duration of the overcurrent is counted using the corrected count value as an initial value (S12).

したがって、この配線用遮断器1によれば、カウント値を配線路4の実際の温度に基づいて補正し、接点引き外しから電源再投入までの放熱時間に合せて、トリップコイル2を適正なタイミングで動作させることができる。具体的には、図3に示すように、放熱時間が短い場合は、カウント値の補正量を少なくし、トリップコイル2を相対的に早く動作させ、電線の発熱を抑えることができる。逆に、図4に示すように、放熱時間が長い場合は、カウント値の補正量を増やし、トリップコイル2を相対的に遅く動作させ、不必要なトリップ動作を回避することができる。   Therefore, according to the circuit breaker 1 for wiring, the count value is corrected based on the actual temperature of the wiring path 4, and the trip coil 2 is set to an appropriate timing according to the heat radiation time from the contact removal to the power re-on. Can be operated. Specifically, as shown in FIG. 3, when the heat dissipation time is short, the correction amount of the count value can be reduced, the trip coil 2 can be operated relatively quickly, and the heat generation of the electric wire can be suppressed. On the contrary, as shown in FIG. 4, when the heat radiation time is long, the correction amount of the count value can be increased, the trip coil 2 can be operated relatively slowly, and unnecessary trip operation can be avoided.

なお、本発明の配線用遮断器は、図1に示した三相三線式配線路4に限定されるものではなく、単相二線式、単相三線式の配線路に適用することもでき、その他、発明の趣旨を逸脱しない範囲で、各部の構成を適宜に変更して実施することも可能である。   The circuit breaker according to the present invention is not limited to the three-phase three-wire wiring path 4 shown in FIG. 1, but can be applied to a single-phase two-wire or single-phase three-wire wiring path. In addition, the configuration of each part can be changed as appropriate without departing from the spirit of the invention.

1 配線用遮断器
2 トリップコイル
3 駆動回路
4 配線路
5 主接点
6 電流センサ
7 CPU
9 温度センサ
15 不揮発性記憶部
DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Trip coil 3 Drive circuit 4 Wiring path 5 Main contact 6 Current sensor 7 CPU
9 Temperature sensor 15 Nonvolatile memory

Claims (1)

CPUが配線路に流れる過電流の継続時間をカウントし、カウント値が閾値に達したときに、遮断機構が配線路上の主接点を引き外す配線用遮断器において、
遮断器ケースの内部温度を検出する温度センサと不揮発性記憶部とを備え、
前記CPUが、前記カウント値が前記閾値に達したら前記不揮発性記憶部に前記カウント値と温度検出値を記憶し、その後主接点の引外しを実施し、電源の再投入後に、前記不揮発性記憶部から引外し前の前記カウント値と前記温度検出値を読み出し、引外し前の温度検出値と現在の温度検出値との差分値に比例する補正量を算出して、当該補正量で引外し前の前記カウント値を減算し、減算後の前記カウント値を初期値として過電流の継続時間をカウントすることを特徴とする配線用遮断器。
In the circuit breaker for the circuit where the CPU counts the duration of the overcurrent flowing through the wiring path, and when the count value reaches the threshold, the breaking mechanism trips the main contact on the wiring path.
A temperature sensor for detecting the internal temperature of the circuit breaker case and a non-volatile storage unit;
The CPU is, the count value stores the count value and the detected temperature value in the nonvolatile storage unit reaches the threshold value, then performing the tripping of the main contact, after power cycle, the non-volatile memory reading the count value and the temperature detection value before tripping the section calculates a correction amount proportional to the difference value between the detected temperature value and the current detected temperature value before tripping, tripping in the correction amount subtracting the count value before, circuit breaker, characterized by counting the duration of overcurrent the count value after the subtraction as an initial value.
JP2010112016A 2010-05-14 2010-05-14 Electronic circuit breaker that counts the duration of overcurrent Active JP5552362B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010112016A JP5552362B2 (en) 2010-05-14 2010-05-14 Electronic circuit breaker that counts the duration of overcurrent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010112016A JP5552362B2 (en) 2010-05-14 2010-05-14 Electronic circuit breaker that counts the duration of overcurrent

Publications (2)

Publication Number Publication Date
JP2011243319A JP2011243319A (en) 2011-12-01
JP5552362B2 true JP5552362B2 (en) 2014-07-16

Family

ID=45409819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010112016A Active JP5552362B2 (en) 2010-05-14 2010-05-14 Electronic circuit breaker that counts the duration of overcurrent

Country Status (1)

Country Link
JP (1) JP5552362B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013178259A1 (en) * 2012-05-30 2013-12-05 Siemens Aktiengesellschaft Overcurrent protection device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11205999A (en) * 1998-01-14 1999-07-30 Mitsubishi Electric Corp Earth leakage breaker
JP3668652B2 (en) * 1999-10-22 2005-07-06 三菱電機株式会社 Electronic circuit breaker
JP2003223839A (en) * 2002-01-30 2003-08-08 Hitachi Ltd Electronic circuit breaker
JP4339668B2 (en) * 2003-11-12 2009-10-07 大阪ヒューズ株式会社 Breaker

Also Published As

Publication number Publication date
JP2011243319A (en) 2011-12-01

Similar Documents

Publication Publication Date Title
JP5337052B2 (en) System and method for overcurrent protection of a circuit
US8665574B2 (en) Thermal memory in a fault powered system
JP2010172191A (en) Protective device for load circuit
RU2466487C1 (en) Overload protection of voltage-reducing device
JP2001286052A (en) Wiring circuit-breaker
JP5212005B2 (en) Electronic circuit breaker
US8228653B2 (en) Circuit breakers with automatic breaker rating
JP5552362B2 (en) Electronic circuit breaker that counts the duration of overcurrent
JP5324344B2 (en) Circuit breaker for wiring that counts the duration of overcurrent
TW202030948A (en) Over-load protection device and method
JP5345444B2 (en) Circuit breaker for wiring that counts the duration of overcurrent
JP5167698B2 (en) Circuit breaker
JP4998119B2 (en) Circuit breaker
JP2008181748A (en) Electric power limiter
JP4739935B2 (en) Inverter device
JP2011253744A (en) Circuit breaker capable of detecting poor contact
JP2010003513A (en) Circuit breaker
JP5026852B2 (en) Circuit breaker
JP5461293B2 (en) Electronic breaker responsive to short circuit current in high impedance circuit
JP5238582B2 (en) Circuit breaker
JP2010257655A (en) Electronic molded-case circuit breaker
JP4389835B2 (en) Power monitoring device
JP5403382B2 (en) Circuit breaker
JP5295850B2 (en) Electronic circuit breaker
JP5245591B2 (en) Overcurrent breaker and overcurrent breaking method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20130319

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20131210

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20131217

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20140207

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20140207

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20140307

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20140314

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20140507

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20140526

R150 Certificate of patent or registration of utility model

Ref document number: 5552362

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250