US3870926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor voltage transformer system
Assignee: English Electric Co Ltd
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Filing: 1973-08-16
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Granted: 1975-03-11
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Expires: 1993-08-16
Abstract
Abstract A system for monitoring very high voltage e.g., 100 kv and above is provided in which a capacitor chain is connected across the voltage. An electromagnetic transformer feeding slow responding circuits is connected across the capacitor at the lower potential and of the chain. An additional impedance, preferably a capacitor, is connected in the chain and a buffer amplifier feeding fast responding circuits is connected across this additional impedance.
Inventors
- 👤 Michael Alan Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/04; G01R15/06; H; H02; H02H; H02H3/00; H02H3/20; H02H7/00; H02H7/04; H02H7/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A high voltage monitoring system comprising a capacitor voltage transformer consisting of capacitor chain for connection across the voltage to be monitored and an electromagnetic transformer connected across a capacitor at the low potential end of the chain, the output produced by said transformer constituing a first output which follows closely the voltage to be monitored under steady state conditions tHereof, a slow response circuit connected to said first output to respond to changes in the voltage to be monitored, an additional impedance connected in the capacitor chain, the output produced by the additional impedance constituting a second output which follows closely the voltage to be monitored under both steady state and rapidly changing conditions thereof and a fast response circuit connected across said second output to respond to rapid changes in the voltage to be monitored.
Claim 2
Dependent Claim
137 words
A high voltage monitoring system comprising a capacitor voltage transformer consisting of capacitor chain for connection across the voltage to be monitored and an electromagnetic transformer connected across a capacitor at the low potential end of the chain, the output produced by said transformer constituing a first output which follows closely the voltage to be monitored under steady state conditions tHereof, a slow response circuit connected to said first output to respond to changes in the voltage to be monitored, an additional impedance connected in the capacitor chain, the output produced by the additional impedance constituting a second output which follows closely the voltage to be monitored under both steady state and rapidly changing conditions thereof and a fast response circuit connected across said second output to respond to rapid changes in the voltage to be monitored.
Claim 3
Dependent Claim
137 words
A high voltage monitoring system comprising a capacitor voltage transformer consisting of capacitor chain for connection across the voltage to be monitored and an electromagnetic transformer connected across a capacitor at the low potential end of the chain, the output produced by said transformer constituing a first output which follows closely the voltage to be monitored under steady state conditions tHereof, a slow response circuit connected to said first output to respond to changes in the voltage to be monitored, an additional impedance connected in the capacitor chain, the output produced by the additional impedance constituting a second output which follows closely the voltage to be monitored under both steady state and rapidly changing conditions thereof and a fast response circuit connected across said second output to respond to rapid changes in the voltage to be monitored.
Claim 4
Dependent Claim
137 words
A high voltage monitoring system comprising a capacitor voltage transformer consisting of capacitor chain for connection across the voltage to be monitored and an electromagnetic transformer connected across a capacitor at the low potential end of the chain, the output produced by said transformer constituing a first output which follows closely the voltage to be monitored under steady state conditions tHereof, a slow response circuit connected to said first output to respond to changes in the voltage to be monitored, an additional impedance connected in the capacitor chain, the output produced by the additional impedance constituting a second output which follows closely the voltage to be monitored under both steady state and rapidly changing conditions thereof and a fast response circuit connected across said second output to respond to rapid changes in the voltage to be monitored.
Claim 5
Dependent Claim
14 words
A system according to claim 1, in which the additional impedance is a capacitor.
Claim 6
Dependent Claim
18 words
A system according to claim 2, including a buffer amplifier between the capacitor and the fast response circuits.
Claim 7
Dependent Claim
29 words
A system according to claim 1, in which the additional impedance comprises a resistor connected in the capacitor chain, and an integrater for integrating the voltage across the resistor.
Claim 8
Dependent Claim
28 words
A system according to claim 3, in which power for the fast response circuits and the buffer amplifier or the operational amplifier is supplied from the electromagnetic transformer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |