GB2000650B - Earth proving circuit - Google Patents

Earth proving circuit

Info

Publication number: GB2000650B
Authority: GB; United Kingdom
Prior art keywords: earth; proving circuit; proving; circuit; earth proving
Prior art date: 1977-06-23
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

Application number

GB7827563A

Other versions

GB2000650A (en

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Boots Co PLC

Original Assignee

Boots Co PLC

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.)

1977-06-23

Filing date

1978-06-21

Publication date

1982-01-20

1978-06-21 Application filed by Boots Co PLC filed Critical Boots Co PLC

1978-06-21 Priority to GB7827563A priority Critical patent/GB2000650B/en

1979-01-10 Publication of GB2000650A publication Critical patent/GB2000650A/en

1982-01-20 Application granted granted Critical

1982-01-20 Publication of GB2000650B publication Critical patent/GB2000650B/en

Status Expired legal-status Critical Current

Classifications

- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/001—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect or interrupted earth connection
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

Landscapes

Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Protection Of Static Devices (AREA)

GB7827563A 1977-06-23 1978-06-21 Earth proving circuit Expired GB2000650B (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
GB7827563A GB2000650B (en)	1977-06-23	1978-06-21	Earth proving circuit

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB2632877		1977-06-23
GB7827563A GB2000650B (en)	1977-06-23	1978-06-21	Earth proving circuit

Publications (2)

Publication Number	Publication Date
GB2000650A GB2000650A (en)	1979-01-10
GB2000650B true GB2000650B (en)	1982-01-20

Family

ID=26258197

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB7827563A Expired GB2000650B (en)	1977-06-23	1978-06-21	Earth proving circuit

Country Status (1)

Country	Link
GB (1)	GB2000650B (en)

1978
- 1978-06-21 GB GB7827563A patent/GB2000650B/en not_active Expired

Also Published As

Publication number	Publication date
GB2000650A (en)	1979-01-10

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Legal Events

Date	Code	Title	Description
1998-07-15	PE20	Patent expired after termination of 20 years	Effective date: 19980620