Tiêu chuẩn quốc tế
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Số hiệu
Standard Number
EN 61557-7:2007
Năm ban hành 2007
Publication date
Tình trạng
A - Còn hiệu lực
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Tên tiếng Anh
Title in English Electrical safety in low voltage distribution systems up to 1 000 V a - c - and 1 500 V d - c - - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequenceIEC 61557-7:2007
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Giá:
Price Liên hệ / Contact us
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Phạm vi áp dụng
Scope of standard This part of IEC 61557 specifies the requirements for measuring equipment applied to testing the phase sequence in three-phase distribution systems. Indication of the phase sequence may be mechanical, visual and/or audible. This part of IEC 61557 does not apply to ancillary measuring equipment for other quantities, for example voltage testers comprising an additional phase sequence indicator. It does not apply to monitoring relays.
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