1、- A-A-59194 9018054 O000225 BOT IMETRIC I I I A-A- 59194 5 May 1998 COMMERCIAL ITEM DESCRIPTION . BUS TRANSFER SWITCHES, ELECTRIC POWER, AUTOMATIC, SHIPBOARD (NON-NUCLEAR APPLICATIONS) The General Services Administration has authorized the use of this commercial item description, for all Federal age
2、ncies. 1. SCOPE - This Commercial Item Description (CID) covers alternating current (ac; 50, 60 or 400 Hz ) and direct current (dc) electric power bus transfer switches, automatic, for shipboard use. Semiconductor (solid state) devices used for transfer switch control circuits and solid state (stati
3、c) bus transfer switches are included. 2. CLASSIFICATION - Bus transfer devices shall be classified by type (see 2.1) and nominal fll load ampere rating (see 3.1.3.1) as defined herein. 2.1 m. The standard types of automatic bus transfer (ABT) switch are designated as follows: ABT - 1 : denotes an a
4、utomatic bus transfer switch encompassing a built-in sensig and control circuit time delay of 1.0 to 2.0 milliseconds on power source failure ( an undervoltage event of 60% of nominal ) and less than 8.33 milliseconds during a transient undervoltage, with a switching or time-to-transfer delay of 500
5、 microseconds, or less. This type is considered as being instantaneous and is applicable for use in distribution systems that supply electronic and combat system loads. The control circuit shall contain the minimum time delay period between sensing the out-of-tolerance condition to initiation of a c
6、ommand-to-transfer to preclude inadvertent transfers occurring due to short time period line voltage fluctuations. Beneficial comments, recommendations, additions, deletions, classifications, etc. and any other data which may improve this document should be sent to: Naval Sea Systems Command, Attn:
7、SEA 03R42,253 1 Jefferson Davis Highway, Arlington, VA 22242-5 106. AMSC NIA FSC 5930 DISTRIBUTION STATEMENT A. Approved for public release; distribution is uniimited. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from I
8、HS-,-,- A-A-59194 m 9038054 0000226 746 m A-A-59194 ABT- 2: ABT- 3: denotes an automatic bus transfer switch encompassing a built-in sensing and control circuit time delay of 0.3 to 0.5 seconds and a short duration switching or time-to- transfer delay of 30.0 to 100.0 milliseconds. This type of auto
9、matic bus transfer switch is applicable for use in distribution systems that supply interior communication, general lighting and receptacle loads. The control circuit shall contain the minimum time delay period between sensig the out-of-tolerance condition to initiating a command to transfer to prec
10、lude inadvertent transfers occurring due to short time period line voltage fluctuations. The switch shall also contain the switching or time-to-transfer delay period measured as the actual time of interruption between power sources. This time period shall be factory set but field adjustable. denotes
11、 an automatic bus transfer switch encompassing a built-in sensing and control circuit time delay of 0.3 to 0.5 seconds and a long duration switching or time-to- transfer delay of 2.5 to 3.5 seconds. This type of automatic bus transfer switch is applicable for use in power distribution systems that s
12、upply transformer andlor motor loads. The control circuit shall contain the minimum time delay period between sensing the out-of-tolerance condition to initiating a command to transfer to preclude inadvertent transfers occurring due to short time period line voltage fluctuations. The switch shali al
13、so contain the switching or time-to-transfer delay period measured as the actual time of interruption between power sources. This time period shall be factory set but field adjustable. Note: Time-to-transfer is the finite period of time required by the unit to disconnect from one input source and co
14、nnect to another input source after receipt of a control circuit command. Optional additional features for each type of transfer switch shall be available when specified, and are described in Table I, Bus Transfer Switch Operating FeaturedOptions. 2.2 Part Identification. Pari identification shall b
15、e assigned to automatic bus transfer based on the designators and the operating features selected Com Table I, and shall be identified on the unit nameplate as follows: TvPe Desimator Voltage Frequency Current Rating 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
16、nse from IHS-,-,-A-A-59194 = 9018054 O000227 b82 m have the device operate such that a transfer of power occurs upon loss of the pre-selected normal line source to the alternate source, and, after a purposeful time delay period, an automatic retransfer of power upon the re-establishment of correct e
17、lectrical parameters in the normal or pre- selected power source. NON-SELECTIVE - No automatic retransfer to the normal source shall occur. This switch shall hold position to the alternate source until a manual transfer is initiated or until a loss of Dower occurs on the alternate source. NS Non- 1
18、Selective A-A-59194 DESIGNATOR S I Selective 3. SALIENT CHARACTERISTICS DESCRIPTION SELECTIVE -A built-in function of the switch that allows an operator to 3.1 Automatic bus transfer (ABT) switch. PP 3.1.1 General. An automatic bus transfer switch as described in these requirements is a device that
19、automatically transfers a common load from a normal supply to an alternate supply in the event of failure of the normal supply. The automatic transfer switch shall be provided with a selectivcdnon-selective selector switch and logic control circuit that inhibits automatic operation of the device fko
20、m returning to a normal supply when the selector switch is in the non-selective position except that the ABT shall revert to automatic operation upon loss of alternate power to the load. This switch shall be integral to the design of the ABT and shall be accessible only from the interior of the encl
21、osure. A status indicator shall be provided on the exterior of the fiont panel to indicate switch position. Phase Protection The switch shall prevent transfer of input sources for all conditions of input power phase differentials greater than plus or minus 15 degrees at the time of connection to the
22、 second source. Both voltage and frequency sensing are reauired. 3.1.2 Performance. The ABT shall continuously monitor the voltage and, when specified, Erequency (for ac units only) of the input power sources and interrupt the existing power source upon sensing an out of tolerance condition by autom
23、atically connecting the output load to an available alternate power source within a predetermined period of time. ABTS shall be of the continuous duty type. The requirements of UL1008 and EEE Std 45 shall be adhered to in the design, manufacture and testing. VS SS FS TABLE I. Bus transfer switch ope
24、rating features/outions. Voltage Sensing Solid State Frequency Sensing The switch shall possess the ability to continuously monitor the input power sources for all-phase voltage magnitudes. The switch shall be constructed such that power transfers are accomplished with solid state power switching de
25、vices. The switch shall possess the ability to continuously monitor the input power sources for all-phase frequency values. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-59194 9018054 O000228 519 = c A-A-59194 3.1.2.1 Transfer voltage. ABTS
26、, when operating at rated frequency (ac units only), shall dropout between 60 and 70 percent of normal operating voltage for transfer to the alternate input source and shd pickup between 85 and 95 percent of normal operating voltage for retransfer to the normal input source. Rated normal operating v
27、oltage shall be considered to be the line-to-line user voltage as specified in the contract or purchase order (see Section 7). For ABT-1 types supplied with voltage sensing, frequency sensing and phase protection, transfer to the alternate input source shall be initiated when the normal source decay
28、s below 80 to 85 percent of nominal voltage. 3.1.2.2 Transfer fi-eauency. If frequency sensing is specified in the ordering requirement (see Section 7), an ac ABT shall have the ability to initiate a transfer when the source frequency falls 2.0 to 3.0 Hz below the normal operating source frequency.
29、3.1.3 Design and construction. The ABT shall be constructed as an enclosed electrical power device or an open device designed for installation in electrical equipment. For bulkhead and deck mounted transfer switches, access, operation and maintenance shall be provided fiom the fi-ont facing panel on
30、iy. Ventilation shall be provided in such a manner as to maintain internal temperature rises in accordance with the values stipulated in UL1008. The ABT cabinet or enclosure shall provide maximum personnel protection in accordance with the requirements of UL1008. In addition the enclosure design sha
31、ll meet the requirements of IEEE Std 45 with respect to environmental protection for specific applications onboard ship. Provision shall be made for manual operation of ABT style switches such that internal access to the enclosure is not required for operation in the manual mode. 3.1.3.1 Current Rat
32、ings. The following tables provide the continuous duty, full load operating current ratings for each size of bus transfer switch along with the maximum overall enclosure dimensions and the maximum per unit weight permitted for each rating. 4 Provided by IHSNot for ResaleNo reproduction or networking
33、 permitted without license from IHS-,-,-A-A-59194 9018054 0000227 455 Current Rating 125 250 A-A-59194 Maximum Maximum Envelope (HxWxD) Maximum Unit Ampere Dimensions in mm Weight (kg) 125 1170 X 610 X 502 100 250 1170 X 610 X502 120 TABLE IL Automatic bus transfer (abt) switches. 400 600 800 1200 1
34、600 2000 3200 4000 400 1550 X 662 X 502 175 600 1860 X 662 X 526 225 800 2010 X 760 X 526 245 1200 1880 X 975 X 760 360 1600 2290 X 760 X 1270 750 2000 2290 X 760 X 1270 750 3200 2290 X 1220 X 1524 1000 4000 2290 X 1220 X 1524 1000 3200 4000 TABLE III. Solid state abt switches. 3200 1800 x 900 x 120
35、0 680 4000 1800 X 900 X 1200 800 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59 1 94 Current Rating 125 250 TABLE W. Solid state abt switch bvpass enclosure. (if required as a separate enclosure to meet requirements of 3.1.3.7) Maximum Enve
36、lope (HxWxD) Maximum Unit Dimensions in mm Weight (kg) 610 X 406 X 610 864 X 610 X 610 80 118 400 600 800 1200 1600 2000 3200 4000 864 X 610 X 610 864 X 610 X 610 1880 X 610 X 610 1880 X 619 X 610 2438 X 1067 X 914 2438 X 1067 X 914 2743 X 1778 X 1219 2743 X 1.778 X 1219 127 136 340 340 727 727 1091
37、 1091 3.1.3.2 Test switches. The ABT shall be provided with test features to enable an operator to check the transfer function by source falhe simulation of voltage or frequency as seen by the voltage sensing or frequency sensing (ac units oniy) devices. 3.1.3.3 Duty Rating. The transfer switches sh
38、all be designed for continuous electrical duty at fidl load current rating and nominal operating voltage and frequency (for ac units oniy). 3.1.3.4 Instantaneous ABT. Any ABT designated as an instantaneous transfer device shall have a total time-to-transfer not greater than 50.0 milliseconds. Closed
39、 transition type switches shall not be used. Solid state and high-speed mechanical ac ABTS shall have a field adjustable instantaneous time-to-transfer in the range between 1.2 and 50.0 milliseconds. The ABT shall be delivered with its time-to-transfer feature factory adjusted in accordance with the
40、 requirements in the ordering data (see section 7). 3.1.3.5 Time delay ABT. ABT types ABT-2 and ABT-3 shall purposely delay, for a predetermined time period, the actual transfer of power between the rst input source and the second input source. The time-to-transfer delay period shall be factory pre-
41、set for the type ordered, but shail be field adjustable. 3.1.3.6 Manual transfer override. The ABT shall incorporate a means of allowing an operator to override the automatic feature of the unit through the initiation of a purposeful manual transfer. This manual transfer may be initiated electricall
42、y or physically depending on the location of the operating device. 3.1.3.7 Bypass capability. A solid state ABT shall have the capability of providing continuous electrical power to the load during such conditions as maintenance and troubleshooting of controlhidication circuits. The bypass function
43、shall disable the switchs ability to transfer 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-59194 m 9038054 0000233 003 m A-A-59194 power between sources and shall automatically activate safety interlock(s) to prevent inadvertent transfers f
44、rom occurring. Bypass isolation circuits, if employed in the design, shall be electricaly isolated fiom an operator in accordance with the requirements of UL1008 and may be contained in a separate enclosure. Refer to Table IV for bypass enclosure parameters. Repair shall be performed using standard
45、tools provided to shipboard electricians. Special electrical test equipment required for maintenance and troubleshootinghepair shd be provided with the bus transfer switch. 3.1.3.8 Overload urotection. The transfer switch shall not provide for electrical power system overload protection within the e
46、nvelope of the device. 3.1.3.9 Short-circuit withstand. Transfer switches shall pass the short-circuit withstand tests as specified in UL1008. For transfer switches rated greater than 400 amperes, the tests shall be conducted as specified in UL1008 for short-circuit values not less than 35,000 amper
47、es and as required in UL1008, or as otherwise specified in the contract or purchase order. 3.1.3.10 Insulation resistance. The insulation resistance of transfer switches shall not be less than 10 megohms when tested in accordance with UL1008. 3.1.3.1 1 Dielectric withstandinp voltage. Transfer switc
48、hes shall pass the dielectric withstanding voltage tests ofUL1008. 3.1.3.12 Line phases. Unless otherwise specified bus transfer switches shd operate in ungrounded three-phase circuits. 3.1.3.13 Diagnostics and Remote Indication. Solid-state automatic bus transfer switches shall incorporate self-che
49、cking diagnostics capable of monitoring the electronic circuits and relating the status of the switch to the operator both locally at the unit and, where specified, remotely through the use of an electronic interface circuit. The network interface method shall be provided as required by the purchase order or contracting documentation. As a minimum non- solid-state automatic bus transfer switches shall be provided with remote status indication ca
