JPH0249327U - - Google Patents
Info
- Publication number
- JPH0249327U JPH0249327U JP12572788U JP12572788U JPH0249327U JP H0249327 U JPH0249327 U JP H0249327U JP 12572788 U JP12572788 U JP 12572788U JP 12572788 U JP12572788 U JP 12572788U JP H0249327 U JPH0249327 U JP H0249327U
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- fault detection
- frequency
- variable
- voltage
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Generators And Motors (AREA)
- Protection Of Static Devices (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は高圧電動機をＶＶＶＦ制御している状態
図、第３図は従来の地絡保護回路例図である。
９……Ｖ０検出回路、１０……ｆ０検出回路、
１１……演算回路、１２……設定回路、１３……
比較回路。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a state diagram in which a high voltage motor is under VVVF control, and FIG. 3 is an example diagram of a conventional ground fault protection circuit. 9...V 0 detection circuit, 10...f 0 detection circuit,
11... Arithmetic circuit, 12... Setting circuit, 13...
Comparison circuit.
Claims (1)
出装置において、地絡検出感度に地絡時の回路電
圧と周波数の比を用いることを特徴とする地絡検
出装置。 A ground fault detection device for a motor controlled by variable voltage and variable frequency, characterized in that a ratio of circuit voltage to frequency at the time of a ground fault is used for ground fault detection sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12572788U JPH0249327U (en) | 1988-09-28 | 1988-09-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12572788U JPH0249327U (en) | 1988-09-28 | 1988-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0249327U true JPH0249327U (en) | 1990-04-05 |
Family
ID=31376590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12572788U Pending JPH0249327U (en) | 1988-09-28 | 1988-09-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249327U (en) |
-
1988
- 1988-09-28 JP JP12572788U patent/JPH0249327U/ja active Pending