CA235012EN UltraSIL Polymer-Housed VariSTAR Type UI ...

1 surge Arresters Catalog Data COOPER POWER. SERIES. Effective June 2015. CA235012EN Supersedes March 2015. UltraSIL Polymer-Housed VariSTAR . Type UI intermediate - class surge arresters General Eaton has set a new standard of excellence for Polymer-Housed intermediate - class surge arresters. Eaton's Cooper Power series UltraSIL . Polymer-Housed VariSTAR Type UI intermediate - class arresters incorporate the industry recognized superior silicone rubber housing with a unique high creep alternating shed profile designed to withstand the most extreme environments. The "standard" silicone rubber housing is designed with a minimum specific creepage distance of 31. mm/kV L-L, which meets category IV (Very Heavy). pollution level according to the IEC standard. This housing is applied over a gapless MOV internal design. Type UI arresters from Eaton meet or exceed the requirements of IEEE Std -2005.

2 Standard including Short Circuit Tests performed in accordance with IEEE Std -2008. standard. Catalog Data CA235012EN Type UI intermediate - class surge arresters Effective June 2015. Table 1. UltraSIL (UI) intermediate - class M12 STUD Ratings and Characteristics UltraSIL SILICONE arrester Characteristic Rating RUBBER HOUSING arrester Voltage Ratings (kV) 3-108. Rated Discharge Energy (kJ/kV of MCOV) Single Impulse Rating System Frequency (Hz) 50/60. FIBERGLASS REINFORCED. EPOXY COMPOSITE Impulse Classifying 10. Current (kA). High Current withstand* (kA) 100. Pressure Relief Rating,** 40. MOV DISKS kA rms sym. Cantilever Strength (in-Ibs) Ultimate MDCL. ALUMINUM UI (3-108 kV) 10,000 Static . ELECTRODES 4,000. * High current, short duration withstand within one minute (100 kA, BONDED SOLID 4/10 s). INTERFACE. ** Cubicle Mount Pressure Relief Rating is 40 kA rms sym.

3 Maximum design cantilever load-static or maximum working load is 40% of the ultimate. ALUMINUM ALLOY. MOUNTING BASE STAINLESS STEEL. NAMEPLATE. Figure 1. Cutaway illustration of 10 kV UltraSIL Polymer-Housed VariSTAR . intermediate - class arrester . Construction materials. Long term environmental testing has verified the lifetime performance advantage silicone rubber provides. The unique construction of UltraSIL Polymer-Housed intermediate - class arresters begins with world class Metal Oxide Varistor (MOV) Independent laboratory tests have verified the superior water repellent disks produced at our dedicated manufacturing facility in Olean, behavior of silicone rubber, which is responsible for the lower external NY. By manufacturing our own disks we maintain a strict quality power losses, higher resistance to UV degradation and surface tracking, control over the entire pro duction process, from initial raw material superior performance in contaminated environments, and other important inspections to final physical and electrical testing of each disk.

4 In insulating properties. Also, UltraSIL silicone rubber has been proven not addition, by controlling the manufacturing process of both disks and to support biological growth and is non-flammable. arresters, we achieve the optimal combination. Eaton produces MOV The standard silicone rubber housed arrester can be customized disks of unsurpassed quality through continuous improvements in disk with a variety of terminal and mounting options which allow users to formulation and manufacturing technology. The end result is a long select the features that meet their application needs. Eaton provides history of in-service use with outstanding durability and protective high creep silicone rubber housings for standard arrester designs capability. equivalent to 31 mm/kV or "/kV. Customers who require longer arrester production begins by stacking glass-collared MOV disks creepage housings can easily select a different housing option through in series with aluminum end electrodes.

5 Our proprietary process the catalog numbering system. See page 8 for a complete list of wraps the assembly with a high-strength woven fiberglass-reinforced available options. epoxy composite. When cured, the arrester module is capable of withstanding extreme electrical and cantilever loading conditions. Operation The UltraSIL silicone rubber housing utilizes an inter ference fit and The operation of the VariSTAR Type UI intermediate - class arrester is bonded onto the internal module to form a solid, void free, high- is typical of gapless metal oxide arresters. During steady-state dielectric strength insulation system. Once the housing is in place, conditions, line-to-ground voltage is applied con tinuously between each arrester must pass a strict series of electrical tests to insure the the line and ground terminals of the arrester . When surges occur, the highest level of in-service performance.

6 arrester immediately limits, or clamps, the overvoltage condition by The silicone rubber housing results in lighter weight than similarly conducting the surge current to ground. After passage of the surge , rated porcelain housed arresters. The silicone rubber housing is also the arrester returns to its initial state, conducting minimal leakage less sensitive to physical damage than porcelain. current. This minimal leakage current (which is primarily capacitive, with a small resistive component) can be tolerated on a continuing basis. Features The UltraSIL Polymer-Housed intermediate - class Type UI. The UltraSIL silicone rubber housing was selected for its superior arrester easily surpasses the minimum fault current withstand insula tion performance when compared to other polymeric housing requirements for intermediate - class arresters as defined in IEEE. 2 Type UI intermediate - class surge arresters Catalog Data CA235012EN .

7 Effective June 2015. Std -2008 standard ( kA). These arresters have been Table 2. Recommended arrester Applications for VariSTAR . tested and shown to withstand fault currents exceeding 40 kA. intermediate - class Arresters During these tests, the silicone rubber housing ruptures without expelling internal parts. System Voltage Recommended arrester Rating (MCOV). (kV rms) kV rms Type UI arresters are ideal for protection against repeated high Delta and energy switching surges and provide reliable protection for substation Three-Wire or Four-Wire Wye Ungrounded Nominal Maximum Solidly Grounded Neutral Wye equipment, capacitor banks, multiple lines, and cable circuits. They are also ideal for applications where lighter weight and shorter heights 3 ( ) 3 ( ). (when compared to porcelain housed arresters) are critical. 3 ( ) 6 ( ). 6 ( ). Design testing 6 ( ) 9 ( ).

8 9 ( ). The housing, internal components, and hardware of an arrester must 6 ( ) 10 ( ). work together as a system. This system must stand up to years of 9 ( ) 12 ( ). service while being subjected to a wide range of environmental and 10 ( ) 15 ( ). electrical stresses. To assure a superior level of performance, both 9 ( ) 15 ( ). arrester components and finished arresters have been subjected 10 ( ) 18 ( ). to a series of tests that accurately represents years of exposure to 10 ( ) 15 ( ). actual field conditions. This testing far exceeds the requirements of 12 ( ) . industry standards. 10 ( ) 15 ( ). The Type UI arrester has also met or exceeded all requirements for 12 ( ) 18 ( ). intermediate - class arresters as defined by IEEE Std -2005 15 ( ) 24 ( ). standard. Reference CP1121 UltraSIL Polymer-Housed VariSTAR Type 21 ( ) 27 ( ). UI intermediate - class surge Arresters Certified Test Report.

9 18 ( ) 24 ( ). 21 ( ) . The Type UI arrester is USDA's Rural Utilities Service (RUS) Section 18 ( ) 24 ( ). ae approved, meeting or exceeding all RUS technical specification 21 ( ) 27 ( ). and workmanship. 27 ( ) 36 ( ). 30 ( ) 39 ( ). Production tests 36 ( ) 48 ( ). 46 39 ( ) . Eaton has implemented a complete production test program to ensure a quality product. Each MOV disk is subjected to a series of 54 ( ) 72 ( ). 69 72 60 ( ) . electrical tests to maintain quality. We also perform additional tests on every MOV disk batch. Listed below are the tests performed on 90 ( ) 108 ( ). 115 121 96 ( ) . the MOV disks: 138 145 108 ( ) . 100% Physical Inspection The following information is normally required: 100% Discharge Voltage Test 100% Vref at 6 mA 1. Maximum system operating voltage. 100% Watt Loss Measured at x MCOV 2. System grounding conditions;. 100% Transmission Line Discharge Energy Test A.

10 For four-wire circuits, grounding conditions depend upon whether the system is multi-grounded, whether it has a Batch High-Current, Short-Duration Test neutral impedance and whether common primary and Batch Thermal Stability Test secondary neutrals are used. Batch Aging Test B. For three-wire circuits, grounding conditions depend upon whether the system is solidly grounded at the source, Each fully assembled UltraSIL Polymer-Housed intermediate - class grounded through neutral impedance at the source arrester also must pass the following production tests: transformers or ungrounded. 100% Physical Inspection 3. Available Fault Current. 100% Vref Test 4. Maximum line-to-ground voltage and overvoltage duration during 100% Watt Loss Test fault conditions. 100% Partial Discharge Inception Voltage Test Contact your Eaton representative to have your individual system application needs reviewed.