Siemens
СРЕДСТВА ПРОМЫШЛЕННОЙ АВТОМАТИЗАЦИИ
официальный партнер Сименс
Каталог СА01 2018
(4872) 700-366
skenergo@mail.ru

3UG4825 monitoring relays

The main conductor, and any neutral conductor to which a load is connected, are routed through the opening of the annular ring core of a residual-current transformer. A secondary winding is placed around this annular ring core to which the monitoring relay is connected.

If operation of a plant is fault-free, the sum of the inflowing and outward currents equals zero. No current is then induced in the secondary winding of the residual-current transformer.

However, if an insulation fault occurs, the sum of the inflowing currents is greater than that of the outward currents. The differential current - the residual current - induces a secondary current in the secondary winding of the transformer. This current is evaluated in the monitoring relay and is used on the one hand to display the actual residual current and on the other, to switch the relay if the set warning or tripping threshold is overshot.

If the measured residual current exceeds the set warning value, the associated change-over contact instantly changes the switching state and an indication appears on the display.

If the measured residual current exceeds the set tripping value, the set delay time begins and the associated relay symbol flashes. On expiry of this time, the associated change-over contact changes the switching state.

ON-delay time for motor start

To be able to start a drive when a residual current is detected, the output relays switch to the OK state for an adjustable ON-delay time depending on the selected open-circuit principle or closed-circuit principle.

The change-over contacts do not react if the set threshold values are overshot during this period.

With the closed-circuit principle selected

Residual current monitoring with Auto RESET (Memory = no)

If the device is set to Auto RESET, the relay switches back to the OK state for the tripping value once the value falls below the set hysteresis threshold and the display stops flashing.

The associated relay changes its switching state if the value falls below the fixed hysteresis value of 5% of the warning value.

Any overshoots are therefore not stored.

Residual current monitoring with Manual RESET (Memory = yes)

If Manual RESET is selected in the menu, the output relays remain in their current switching state and the current measured value and the symbol for overshooting continues to flash, even when the measured residual current returns to a permissible value. This stored fault status can be reset by pressing the UPв–І and DOWNв–ј keys simultaneously for > 2 seconds, or by switching the supply voltage off and back on again.

Note:

The neutral conductor must no longer be grounded after the summation current transformer because otherwise the residual current monitoring function cannot be ensured.

















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Арматура DENDOR

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Датчики и измерители

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Регуляторы и регистраторы

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Пневматическое оборудование

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Краны и Клапаны

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Измерительные приборы

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Системы беспроводного управления «умный дом»

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Бесконтактные выключатели Конечные выключатели Оптические датчики Энкодеры

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SKW-FS - Установка умягчения

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SKW-FK - Установка обезжелезивания
Каталог оборудования 2018
Siemens Industry Catalog Drive technology Automation technology Automation systems Operator control and monitoring systems SIMATIC HMI Identification systems Industrial communication Industrial controls Industrial Communication Switching devices Protection Equipment Load feeders and motor starters Monitoring and control devices SIMOCODE 3UF motor management and control devices LOGO! logic module Relays Timing relays Monitoring relays SIRIUS 3RR21, 3RR22 monitoring relays f. mounting onto 3RT2 contactors SIRIUS 3RR24 mon. relays for mounting onto 3RT2 contactors for IO-Link SIRIUS 3UG45, 3UG46 monitoring relays for stand-alone installation SIRIUS 3UG48 monitoring relays for stand-alone installation for IO-Link Line monitoring Voltage monitoring Current monitoring Power factor and active current monitoring Residual-current monitoring Residual-current monitoring relays 3UL23 residual-current transformers Speed monitoring Accessories SIRIUS 3RS10, 3RS11, 3RS20, 3RS21 temperature monitoring relays SIRIUS 3RS14, 3RS15 temperature monitoring relays for IO-Link SIRIUS 3RN2 thermistor motor protection SIRIUS 3RN1 thermistor motor protection Coupling relays and signal converters/interface converters Safety Technology Position and Safety Switches Commanding and signaling devices Parameterization, Configuration and Visualization with SIRIUS SITOP power supply SIRIUS non-stabilized power supplies Transformers Filters Reactors Industry software PC-based Automation Process control systems Process instrumentation Process analytics SITOP power supply Products for specific requirements Energy Building Technologies Low-Voltage controls and distribution Safety Systems - Safety Integrated Market-specific solutions Industry Services Software ... and everything else you need




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