Memshield Overcurrent Protection Relay (AOR1B)
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1 (AOB) Multi-function Protection Device Local and remote trip indication AO-B type OCs are available with trip indications. Two types of trip indication function are available: single contact type and individual contact and LED type. Single contact type This is a voltage-free contact which closes for 0ms and then resets when the ACB is tripped by any one of the LTD, STD, INST/MC or GFT functions. Output is on terminals and. Individual contact and LED type This type has an individual contact and LED for LTD, STD and INST/MC., and GFT overcurrent functions. The PE-TIP function is incorporated on OCs with these type of indicators and a corresponding contact and LED are fitted. Additionally a SYSTEM ALAM contact and LED are provided to give warning of abnormality in the OC unit. A separate control supply is required for these indicators. Trip Indicator Contact atings Single ated Voltage AC0V AC0V DC0V DCV DC0V Contact ated Current (esistive) A A A 0.A 0.A Type ated Current (inductive) A A A 0.A 0.A Individual ated Voltage AC0V AC0V DC0V DCV DC0V Contact ated Current (esistive) 0.A 0.A A 0.A 0.A Type ated Current (Inductive) 0.A 0.A 0.A 0.A 0.0A ) All contacts are voltage-free and operate as following table Type of OC Auto. eset Contacts * Hold Contacts * For general feeder PE-TIP LTD, STD, INST/MC, GFT (L, M char.) System Alarm For generator protection LTD, STD, INST/MC System Alarm (S char.) PE-TIP Notes: (A) Contacts *:The contacts for LTD, STD, INST/MC close for 0ms and then reset. The contact for PE-TIP resets when the current level drops below pick-up setting *:The contacts remain until the ESET button on the front of the OC is operated. (emote resetting can be achieved by disconnection of the control supply) STD and INST/MC is common terminal. (B) LEDs LEDs (except for PE-TIP) remain until the ESET button is operated or the control supply is disconnected. LED for PE-TIP goes out when the current level drops below pick-up setting. UPS Backup power supply This unit provides a constant supply for the display indicators (LEDs & volt free contacts) in the event of a power failure for up to hour. It contains rechargeable batteries which will be maintained at full charge through the AC supply voltage. Spec Unit Unit Input voltage 0 ~ 0V AC 0 ~ 0V Output V DC V DC Outline dimensions on page. For further information contact MEM Ltd. (00V) for details. DC Power supply MHT Manual reset Systems utilizing a control voltage of 0, or 0V D.C. must use the D.C. power supply module for the O.C.. to work effectively. See page for more information. The option of a manual MHT reset button is available upon request. This button protrudes through the ACB label and must be depressed following an overcurrent trip in order to close the ACB.
2 (AOB) Multi-function Protection Device OC specifications The multi-function protection device for ACBs is an -bit microprocessor controlled, r.m.s. sensing overcurrent relay (OC). The OC range is divided into three groups: AO-BL (standard inverse characteristic) AO-BM (very/extremely inverse characteristic) AO-BS (generator protection). Optional protection functions, indication and a current monitoring facility are available. Protection functions Trip indicators Protection List No LTD Single Individual Current Field Control voltage characteristic STD PE-TIP GFT N-phase contact contact and monitoring test INST type LED type function facility Generator Protection General feeder M-characteristic L-characteristic S-characteristic AO-BL-AL AO-BL-GL AO-BL-AS AO-BL-GS AO-BL-NS AO-BL-ES AO-BL-AI AO-BL-GI AO-BL-NI AO-BL-EI AO-BM-AL AO-BM-GL AO-BM-AS AO-BM-GS AO-BM-NS AO-BM-ES AO-BM-AI AO-BM-GI AO-BM-NI AO-BM-EI AO-BS-AL AO-BS-AS AO-BS-NS AO-BS-AI AO-BS-NI Notes: : Not available when [ICT] is 0, 0 or 0A : AN- OC checker required to meet NK standard. : Long time-delay, short time-delay, instantaneous and ground fault will still operate even if the control voltage is lost. : With MC function Not required Not required Not required Not required Not required List No Key AO-B L A L L-characteristic M-characteristic S-characteristic A G N E with LTD, STD, INST. A+Ground fault protection A+Neutral pole protection N+Ground fault protection L S I Single contact type Individual contact and LED type and pre-trip alarm features of S and Current monitoring Field test facility Field test-facility is included on versions of AO-B that have indication LEDs and contacts. This function permits a simple field check to be performed on the LTD, STD and INST characteristics. TIP or NON-TIP tests of the circuit breaker are possible.to operate push button on OC (trip indication is by the LEDs on the front of the AO-B).
3 OC checker (external) ANH-B Type ANH-B OC checker operates on 0-V AC and permits overcurrent release tests without requiring any special skill. Ideal for inspection, testing and maintenance purposes. AN- POTABLE CHECKE The AN- portable checker permits field checking of the tripping functions of the AO-B range of OCs. Electromagnetic inst. trip This is a direct-acting non-adjustable, instantaneous trip device. (Not available for MACB0). Pick-up current settings MACB0 MACB MACB MACB MACB MACB0 ka.ka ka OC alarm switch ated Voltage Power Consumption Test Functions Outline Dimensions Weight 0-V AC 0/0Hz 00VA Overcurrent trip device calibration tests: Long time-delay trip Short time-delay trip Instantaneous trip Pre-trip Alarm Ground fault trip Continuity check of current transformers WxHxD00(mm) kg ated Voltage Power Consumption Test Functions Outline Dim. Weight 0/V AC 0/0Hz or V DC battery VA Long time-delay trip check Short time-delay trip Instantaneous trip check W x H x D(mm) 0g The OC Alarm switch (normally open contact) indicates the operation of the electromagnetic instantaneous trip device only. ON for 0 ms, then OFF. ating of contact Load esistive Lamp Inductive Motor AC V A 0.A A 0.A AC 0V A 0.A A 0.A DC 0V A A A A DC V 0.A 0.0A 0.A 0.0A DC 0V 0.A 0.0A 0.A 0.0A Current transformer for neutral line Ground fault protection in a -phase, -wire system is possible with a -pole breaker using the ground fault trip function, In this application a neutral line current transformer that matches the breaker s ground fault protection characteristic should be used. MEM Ltd. (00V) can provide CT for Neutral line. A neutral line CT is built into the -pole type when the breaker ground fault protection is used. If line fed K should face towards the line side. If load fed K should face towards the load side. Neutral CT connection diagram K L k l Neutral CT N-Line k l k l k l n kc kb ka 0 OC g Outline dimensions of CT for neutral line k l L 0 0 MACB0, MACB, MACB, MACB0 K M 0 ø L -M Tap for fixing secondary wiring 0 0 K 0 k l K -ø M L -ø MACB0, MACB, MACB, MACB0, Type CW0-0LS ated 0 00 Primary 0 Current (A) 0 ated secondary current is A Type CW0-0LS ated Primary Current (A) 000 ated secondary current is A ACB ( pole) Example: for MACB-MACB0 types 0 0 0
4 General Feeder Circuits, L-Type Standard Inverse Characteristic Curve Setting range of protection functions Note: Standard settings are underlined Protection Functions Characteristics LTD Pick-up current [I] (A) Time-delay [T] (s) STD Pick-up current [I] (A) Time-delay [T] (ms) elay-time (ms) graduations Opening time (ms) esettable time (ms) Max. total clearing time (ms) Setting ange [I0] x ( NON) graduations Non-tripping at [I] setting x % and below. Tripping at 0% and above. ( ) at [I] x 00% current. graduations ±% (±0% when [ICT] of type MACB0 is 0A or 0A) [I0] x (.. NON) graduations ±% INST or MC Pick-up current [I] (A) PE-TIP Pick-up current [IP] (A) Time-delay [TP] (s) GFT Pick-up current [IG] (A) Time-delay [TG] (ms) elay-time (ms) graduations Opening time (ms) esettable time (ms) Max. total clearing time (ms) N-phase Protection Pick-up current [IN] (A) Time-delay [TN] (s) [TN = T] Control Power [ICT] and Base current [I0] Values [I0] x ( NON) graduations ±0% [I0] x ( ) graduations ±.% (±% when [ICT] of type MACB0 is 0A or 0A) ( ) at over [IP] setting. graduations ±% Note: Ground fault current setting [IG] should be below 00A. [ICT] x ( ) graduations ±0% [ICT] x ( ) Fixed setting. Specify at time of order. Non-tripping at [IN] setting x % and below. Tripping at 0% and above. graduations using [T] setting dial at [IN] x 00% current ±% (±0% when [ICT] of type MACB0 is 0A or 0A) AC, DC 0-0V or DCV / VA List No Applicable Base current [I0] (A) [ICT] [ICT] [ICT] [ICT] [ICT] (A) x 0. x 0. x 0. x.0 MACB MACB MACB List No Applicable Base current [IO] (A) [ICT] [ICT] [ICT] [ICT] [ICT] (A) x 0. x 0. x 0. x.0 MACB MACB MACB MACB
5 General Feeder Circuits, L-Type Standard Inverse Characteristic Curve Front face of multi-function protective device Type: AO-BL-GS Base current setting dial LTD pick-up current setting dial LTD time-delay setting dial STD pick-up current setting dial STD time-delay setting dial INST pick-up current setting dial PE-TIP pick up current setting dial PE-TIP time-delay setting dial GFT pick-up current setting dial GFT time-delay setting dial HOT/COLD select switch INST/MC select switch amp characteristic select switch LED for trip indicator LED for system alarm indicator Field test facility eset button Test terminals (for AN-) Trip indicator contact terminals Control power terminals. Multi-function protection characteristics Operating time second minute hour 00ms 00ms N-phase current GFT current N-phase time GFT time PE-TIP time LTD current PE-TIP current STD time STD current INST current LTD time 00ms 00ms 0ms 0ms Percent rated current of OC CT primary current [ICT] Percent rated current of base current [IO]
6 General Feeder Circuits, M-Type Very/Extremely Inverse Characteristic Curve Setting range of protection functions Note: Standard settings are underlined. With IT (very inverse) / IT (extremely inverse) please specify at time of order. Protection Functions Setting ange Characteristics LTD Pick-up current [I] (A) Time-delay [T] (s) STD Pick-up current [I] (A) Time-delay [T] (ms) elay-time (ms) graduations Opening time (ms) esettable time (ms) Max. total clearing time (ms) INST or MC Pick-up current [I] (A) PE-TIP Pick-up current [IP] (A) Time-delay [TP] (s) GFT Pick-up current [IG] (A) Time-delay [TG] (ms) elay-time (ms) graduations Opening time (ms) esettable time (ms) Max. total clearing time (ms) N-phase Protection Pick-up current [IN] (A) Time-delay [TN] (s) [TN = T] Control Power [ICT] and Base current [I0] Values [I0] x ( NON) graduations Non-tripping at [I] setting x % and below. Tripping at 0% and above. ( ) at [I] x 00% current. graduations ±0% (±0% when [ICT] of type MACB0 is 0A or 0A) [I0] x (.. NON) graduations ±% [I0] x ( NON) graduations ±0% [I0] x ( ) graduations ±.% (±% when [ICT] of type MACB0 is 0A or 0A) ( ) at over [IP] setting. graduations ±% Note: Ground fault current setting [IG] should be below 00A. [ICT] x ( ) graduations ±0% [ICT] x ( ) Fixed setting. Specify at time of order. Non-tripping at [IN] setting x % and below. Tripping at 0% and above. graduations using [T] setting dial at [IN] x 00% current ±0% (±0% when [ICT] of type MACB0 is 0A or 0A) AC, DC 0-0V or DCV / VA Type Applicable Base current [I0] (A) [ICT] [ICT] [ICT] [ICT] [ICT] (A) x 0. x 0. x 0. x.0 MACB MACB MACB Type Applicable Base current [IO] (A) [ICT] [ICT] [ICT] [ICT] [ICT] (A) x 0. x 0. x 0. x.0 MACB MACB MACB MACB
7 General Feeder Circuits, M-Type Very/Extremely Inverse Characteristic Curve Front face of multi-function protective device Type: AO-BM-GS Base current setting dial LTD pick-up current setting dial LTD time-delay setting dial STD pick-up current setting dial STD time-delay setting dial INST pick-up current setting dial PE-TIP pick up current setting dial PE-TIP time-delay setting dial GFT pick-up current setting dial GFT time-delay setting dial HOT/COLD select switch INST/MC select switch amp characteristic select switch LED for trip indicator LED for system alarm indicator Field test facility eset button Test terminals (for AN-) Trip indicator contact terminals Control power terminals. Multi-function protection characteristics [I T] extremely inverse [I T] very inverse Operating time second minute hour N-phase current GFT current 00ms 00ms GFT time PE-TIP time N-phase time STD time LTD current PE-TIP current STD current INST current 00ms 00ms [I T] extremely inverse [I T] very inverse 0ms 0ms Percent rated current of OC CT primary current ICT Percent rated current of base current [IO]
8 ACB - Electrical Tripping Devices Undervoltage trip (UVT) The undervoltage trip (UVT) automatically trips the ACB when the control power voltage drops below a pre-determined value. When the control voltage is restored to a value equal to or greater than the pick-up value, the ACB can be closed. The UVT consists of a trip control device and a tripping mechanism. Two types of UVT are available: AUT-BS (instantaneous trip type: AC and DC control voltages available) and AUT-BD (00ms or sec time delay type. The DC versions of the AUT-BS require an external current limiting resistor to be used (supplied with the ACB). emote opening of the circuit breaker by the UVT is possible by connection of a normally open push button across terminals and. AC SOUCE A B AUT-BD. AUT-BS UVT CONTOL DEVICE C C ec AUX SW PB (OPEN) O OCy etc. C D y * UVT C UVT ENEGIZED "OFF" D * AUT-BD only DC SOUCE PB (OPEN) O OCy etc. Current limiting resistor + (For D.C. control device type AUT-BS).kΩ 0W...DC0-V, 00-0V 0Ω 0W...DCV 0Ω 0W...DCV Current limiting esistor S B A AUX SW * AUT-BS UVT CONTOL DEVICE C * UVT ENEGIZED "OFF" y Note: * Fitted on the circuit of rated control voltage 00-0V DC * When the rated control voltage is 00-0V DC, two switches in series are used D D UVT atings Type of UVT ated Control Opening Voltage (V) Coil Excitation Power Consumption (VA) Control Device Voltage (V), 0/0Hz [Pick-up Voltage (V)] Current (A) Normal eset AUT-BS AC 0.. [] 0. (0V) [0] 0. (V) [0] 0. (0V) [] 0. (0V) 0 0. [] 0. (V) AUT-BS DC 00 0 [] 0. (00V) AUT-BD 0. [] 0. (0V). [0.] 0.. [0] Note: Time delay available for 0- VDC only.
9 S-Type: Generator Protection Setting range of protection functions Note: Standard settings are underlined. Protection Functions Characteristics LTD Pick-up current [I] (A) Time-delay [T] (S) STD Pick-up current [I] (A) Time-delay [T] (ms) elay-time (ms) graduations Opening time (ms) esettable time (ms) Max. total clearing time (ms) INST or MC Pick-up current [I] (A) PE-TIP Pick-up current [IP] (A) Time-delay [TP] (s) N-phase Protection Pick-up current [IN] (A) Time-delay [TN] (s) [TN] = [T] Control Power Setting ange [I0] x ( NON) graduations ±% (±% when [ICT] of type MACB0 is 0A or 0A) ( ) at [I] x0% current. graduations ±% (±0% when [ICT] of type MACB0 is 0A or 0A) [I0] x (.... NON) graduations ±% (±%when [ICT] of type MACB0 is 0A or 0A) [I0] x ( NON) graduations ±0%. [I0] x ( ) graduations ±% (±% when [ICT] of type MACB0 is 0A or 0A). ( ) at [IP] x 0% current graduations ±% (±0% when [ICT] of type MACB0 is 0A or 0A) [I0] x ( ) Fixed setting. Specify at time of order. ±.% graduations using [T] setting dial at [IN] x 0% current ±% (±0% when [ICT] of type MACB0 is 0A or 0A) AC, DC 0-0V or DCV / VA Acceptable range of base current [I0] for the rated generator current [IGEN] Type ated primary [IGEN] = [I0] current [ICT] (A) range (A) MACB0 0 0 [I0] < [I0] < [I0] < [I0] 0 MACB 0 0 [I0] < [I0] < [I0] 0 MACB 0 0 [I0] < [I0] < [I0] [I0] 00 MACB0 0 0 [I0] < [I0] < [I0] [I0] [I0] 000 MACB 0 [I0] < [I0] < [I0] < [I0] < [I0] 00 MACB [I0] < [I0] 00 MACB [I0] 000
10 S-Type: Generator Protection Front face of multi-function protective device Type: AO-BS-AS LTD pick-up current setting dial LTD time-delay setting dial STD pick-up current setting dial STD time-delay setting dial INST pick-up current setting dial PE-TIP pick up current setting dial PE-TIP time-delay setting dial HOT/COLD select switch INST/MC select switch amp characteristic select switch LED for trip indicator LED for system alarm indicator Field test facility eset button Test terminals (for AN-) Trip indicator contact terminals Control power terminals. Multi-function protection characteristics Operating time second minute hour N-phase current N-phase time PE-TIP time STD time PE-TIP current LTD current STD current LTD time INST current 00ms 00ms 0ms With MEM s commitment to provide the latest technology our ACB s are set apart from the rest. In addition to the OC we can offer... Universal Early Warning System: Complete control over distribution networks can be achieved by incorporating the latest Intelligent Monitoring and Protection System. A brand new innovation offering many, unique protection and monitoring features in addition to the benefits of a state-of-the art over current release. Features include Continuous monitoring and alarm functions Earth fault protection with zone interlocking Communication with PCs. Building management systems. PLCs. Power distribution control systems. Local or remote display of system status Contact us for full details Percent rated current of generator [IO]
OCR alarm (AL) (standard) When it happen to trip by over current, ground fault ( GFR ) and Earth leakage ( ER ), it issue a warning alarm.
A Power supply module This module provides control source for DISPLAY module,trip indicator and several indicators (LEDs). (Even when the control power source is off, the function of over current protection
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