US20210313131A1
The electromagnetic relay module of claim 1, wherein the electromagnetic relay module is a safety relay module configured to fulfill a safety-relevant function and wherein the first relay...
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Patents Relay Protection
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Relay-contact lift protection system (versions) Abstract FIELD: passenger lifts. SUBSTANCE: invention relates to safety devices of passenger lifts provided with mechanical story switches in electric circuits.
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ABSTRACT OF THE DISCLOSURE A digital frequency relay for use in protecting an electrical power transmission line in the event of frequency deviations indicative of a fault condition, including an input
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The calculation method will be described later. (First embodiment) Drawing 1 is a figure showing the composition of transformer protection relay system 1 of an embodiment. The transformer protection
2015-49(3)-2.vp
Relay protection is the main form of electrical automa-tion, without which normal and reliable operation of modern electric networks and systems are impossible. It is well known that relay protection and
U.S. Patent Application for PROTECTION RELAY Patent Application
Protection relay 50 in FIG. 2 is configured similarly to a so-called digital relay device. Specifically, referring to FIG. 2, protection relay 50 includes an analog input circuit 51, an arithmetic
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Protective relays monitor conditions in the power distribution system and operate circuit breakers in response to the detection of adverse conditions, thereby protecting various segments and
US Patent Application for Relay Protection Patent Application
A relay protection device is disclosed for use with a magnetic latching relay, the relay having two stable states. The relay comprises an electromagnetic device which under the effect of a switching impulse
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Protection relays Numerical relays are based on the use of microprocessors. The first numerical relays were released in 1985. A big difference between conventional
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Technology and persistent engineering would eventually solve these early teething problems, and that, coupled with new economic pressures during the 1990s, opened the door for the present generation
SOLID STATE RELAY MODULE WITH OVERCURRENT
This disclosure is directed to a solid state relay (SSR) module with overcurrent protection. In contrast to traditional mechanical relays or contactors which uses spring loaded terminals, the SSR
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The paper summarizes the operating principles of relay applications, the available measurements used by relays and the protection schemes for various faults that occur frequently in
Basic Theories of Power System Relay Protection
This chapter first introduces the basic theories of power system relay protection, summarizes the functions and basic requirements of relay protection, and illustrates the basic principles of relay
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A hybrid protective relay having enhanced contact response time
The protective relay of claim 13 including a fuse (26) connected in series with said second triac and said second terminal to protect said photoelectric switch and said semiconductor switch from overcurrent
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They facilitate the understanding of relay coordination, relay settings, fault analysis, and the selection of appropriate protection schemes. Ultimately, these case studies contribute to the
RELAY PROTECTION SYSTEM
If a short to ground condition is de-tected, the relay protection system can prevent the relay from transitioning from an open position to a closed po-sition. As a result, a power source can remain
US20090195082A1
Solid state relays generally employ an isolation device between the input device or control signal and the relay. One type of isolator is an opto-isolator which uses a light source and a photodiode to isolate
US20180233313A1
H01H — ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES H01H50/00 — Details of electromagnetic relays H01H50/16 — Magnetic circuit arrangements
SOLID STATE RELAY MODULE WITH OVERCURRENT PROTECTION
Description This disclosure is directed to an electrical relay module, and more particularly to a solid state relay mod-ule with overcurrent protection. Mechanical contactors are heavy-duty