GB1450694A - Circuit for detecting phase unbalance in a three phase supply - Google Patents
Circuit for detecting phase unbalance in a three phase supplyInfo
- Publication number
- GB1450694A GB1450694A GB4757773A GB4757773A GB1450694A GB 1450694 A GB1450694 A GB 1450694A GB 4757773 A GB4757773 A GB 4757773A GB 4757773 A GB4757773 A GB 4757773A GB 1450694 A GB1450694 A GB 1450694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- signals
- voltage
- phase unbalance
- amplifier
- 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
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
Classifications
-
- 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
- H02H3/26—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
1450694 Phase unbalance protection CANADIAN GENERAL ELECTRIC CO Ltd 11 Oct 1973 [28 Dec 1972] 47577/73 Heading H2K A phase unbalance protective system comprises three current to voltage transducers (Fig. 1, not shown) providing signals to halfwave rectifiers 30A, 30B, 30C, and three differential integrating circuits such as 34A, 35, 36A, 38A, 39A, 45, 46, 145, 146 which each receive two of the half-wave signals and provide D.C. output at 47A, 47B, 47C, proportional to the input signal difference. The unidirectional sum of these signals is then selected to be amplified at 53 and part of the resultant signal is fed to an amplifier 58 controlling a transistor 60 to provide a current sink for D.C. provided to a time delay circuit 64, 65 so that when the transistor 60 conducts or due to imbalance signal from amplifier 58 capacitor 64 changes to a voltage representing the imbalance and this voltage controls threshold indicating and tripping circuits through diodes 79 and 79A.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA160,071A CA960754A (en) | 1972-12-28 | 1972-12-28 | Circuit for detecting phase unbalance in a three phase supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1450694A true GB1450694A (en) | 1976-09-22 |
Family
ID=4095401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4757773A Expired GB1450694A (en) | 1972-12-28 | 1973-10-11 | Circuit for detecting phase unbalance in a three phase supply |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS4997248A (en) |
| CA (1) | CA960754A (en) |
| DE (1) | DE2351159A1 (en) |
| FR (1) | FR2212667A1 (en) |
| GB (1) | GB1450694A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025043495A1 (en) * | 2023-08-29 | 2025-03-06 | 西门子股份公司 | Multi-phase current balance state representation method and apparatus, electronic device, and storage medium |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2810046C2 (en) * | 1978-03-08 | 1980-02-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method and device for measuring electrical currents and / or voltages in a plurality of current or voltage circuits |
| CH632108A5 (en) * | 1978-07-14 | 1982-09-15 | Sprecher & Schuh Ag | Electrical circuit for simulating the thermal behaviour of a three-phase electrical apparatus or machine |
| FR2696592B1 (en) * | 1992-10-05 | 1994-12-02 | Merlin Gerin | Electronic trip device with earth protection. |
-
1972
- 1972-12-28 CA CA160,071A patent/CA960754A/en not_active Expired
-
1973
- 1973-10-10 FR FR7336271A patent/FR2212667A1/fr not_active Withdrawn
- 1973-10-11 DE DE19732351159 patent/DE2351159A1/en active Pending
- 1973-10-11 GB GB4757773A patent/GB1450694A/en not_active Expired
- 1973-10-16 JP JP11542073A patent/JPS4997248A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025043495A1 (en) * | 2023-08-29 | 2025-03-06 | 西门子股份公司 | Multi-phase current balance state representation method and apparatus, electronic device, and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2212667A1 (en) | 1974-07-26 |
| DE2351159A1 (en) | 1974-07-11 |
| CA960754A (en) | 1975-01-07 |
| JPS4997248A (en) | 1974-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |