CA1094698A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
System for detection of process trip
Assignee: Canadian General Electric Co Ltd
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Filing: 1977-04-21
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Granted: 1981-01-27
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Expires: 1997-04-21
Abstract
Abstract Case 2316 ABSTRACT OF THE DISCLOSURE It is desirable to be able to detect an emergency shutdown or "trip" of a process by independent means, that is without receiving a signal from the control means that initiates the trip. This is the case, for example, in a nuclear reaction process. The independent trip detection of this invention determines the rate of change of a parameter representative of the state of the process and provides a signal representing the rate of change. The signal is compared with a reference and if (a) the parameter has changed by a predetermined amount and (b) the rate of change has exceeded a predetermined level continuously for a period of time consistent with a process trip, then an output signal is provided indicative of a process trip having occurred.
Inventors
- 👤 Herbert N. Klingbeil
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-04 08:22
CPC Classifications
G; G21; G21C; G21C7/00; G21C7/36; G21C7/26; G21D; G21D3/00; G21D3/04; G21D3/06; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
Case 2316 The embodiments of the invention in which an exclu- sive property or privilege is claimed are defined as follows: 1. A method for detecting a process trip, comprising the steps of: determining the rate of change of at least one parameter representative of the state of the process, and providing a signal representing said rate of change, determining from said signal that (a) said parameter has changed by a predetermined amount and (b) said rate of change has exceeded a predetermined level continuously for a period of time consistent with a process trip, and then providing an output indicative of a process trip.
Claim 2
Independent Claim
83 words
A method for detecting a process trip, comprising the steps of: determining the rate of change of at least one parameter representative of the state of the process, and providing a first signal representing said rate of change, comparing said first signal to a predetermined reference level and providing as an output a second signal when said first signal exceeds said reference level continuously for a period of time consistent with a process trip, said second signal being indicative of a process trip.
Claim 3
Dependent Claim
47 words
A method as defined in claim 1 or 2 in which said period of time is determined by deriving an integral with respect to time signal related to magnitude of said first signal, said period of time extending until said time integral signal reaches a predetermined level.
Claim 4
Dependent Claim
53 words
A method as defined in claim 1 or 2 in which said period of time is determined by deriving a time integral signal related to the excess of said first signal over said reference level and the said period of time extending until said time integral signal reaches a predetermined level. Case 2316
Claim 5
Dependent Claim
54 words
A method as defined in claim 1 or 2 in which said period of time is determined by deriving a time integral signal related to a limited portion of the excess of said first signal over said reference level and said period of time extending until said time integral signal reaches a predetermined level.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1 or 2 in which said period of time is a fixed predetermined time.
Claim 7
Independent Claim
153 words
A method for detecting a process trip, comprising the steps of measuring at least one parameter representative of the state of said process and deriving a first signal representing the value of said parameter, differentiating said first signal to provide a second signal representing the rate of change of said parameter, filtering said second signal to attenuate high frequency components, comparing said filtered second signal with a predetermined reference level and providing a third signal when said second signal exceeds said reference level, integrating at least a portion of said third signal to provide a fourth signal whose magnitude represents the integrated value, reducing said fourth signal to zero when said filtered second signal is less than said predetermined reference level, comparing said fourth signal with a predetermined reference value and providing an output signal when said fourth signal exceeds said predetermined reference value, said output signal being indicative of a process trip.
Claim 8
Dependent Claim
28 words
A method as defined in claim 6 in which said third signal is proportional to the excess of said second signal over said predetermined reference level. Case 2316
Claim 9
Dependent Claim
16 words
A method as defined in claim 7 in which said third signal has a fixed magnitude.
Claim 10
Independent Claim
139 words
A method for detecting a process trip, comprising the steps of measuring at least one parameter representative of the state of said process and deriving a first signal representing the value of said parameter, differentiating said first signal to provide a second signal representing the rate of change of said parameter, filtering said second signal to attenuate high frequency components, initiating a timing sequence having a predetermined time period when said filtered second signal exceeds a predetermined trigger level, said timing sequence continuing as said filtered second signal remains continuously above a predetermined reset level, restoring said timing sequence to the beginning when said filtered second signal falls below said predetermined reset level and providing an output signal when said timing sequence reaches the end of said predetermined time period, said output signal being indicative of a process trip.
Claim 11
Dependent Claim
35 words
A method as defined in claim 10 and further including the step of introducing a time delay following the said timing sequence reaching the end of said predetermined time period before providing said output signal.
Claim 12
Dependent Claim
110 words
Apparatus for the detection of a process trip, comprising means for determining the rate of change of at least one parameter representative of theprocess and for providing a signal representing the rate of change, Case 2316 Claim 12 continued: comparator means for comparing said first signal with a predetermined reference level and providing a second signal only when said first signal exceeds said predetermined reference level, and timing means for establishing a period of time, said timing means providing an output signal when said second signal is received continuously for said period of time and is consistent with a process trip, said output signal being indicative of a process trip.
Claim 13
Dependent Claim
46 words
Apparatus as defined in claim 12 in which said timing means establishes said period of time by integrating said second signal, said period of time extending from the start of said second signal until a predetermined level is reached by integration of said second signal. 11
References Cited (Backward Citations)
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