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Polymer-housed 33kv surge arrester
Surge Arresters 5 kA and 10 kA Class 1
IEC 60099-4 for MV systems to 36 kV
The advantages of polymer-housed arresters reduced size and weight, and enhanced safety have been refined in this new generation of surge arresters: the polymer-housed surge arrester from Watt Electric.
The polymer-housed surge arrester incorporates the industry recognized superior polymeric material - silicone rubber.
Using Metal Oxide Varistors (MOVs) having excellent electrical properties, these arresters provide superior overvoltage protection for MV distribution systems. Manufacturing our own MOV disks allows strict quality control over the manufacturing process from start to finish.
After production, every MOV disk must pass a series of electrical tests designed to ensure the highest individual disk quality. These MOV disks have proven their reliability and protective abilities through years of in-service use.
Polymer-housed surge arresters are available in 5 kA and 10 kA Class 1 IEC 60099-4 designs.
Construction lightning arrester
The MOV disks are combined with aluminum end electrodes and are encapsulated in a high strength composite wrap insulating material on our fully automated assembly line using strict quality control processes that eliminate manufacturing variances. The composite collar is cured to the MOV disk stack to form a solid insulation MOV disk module system that is inserted and bonded to the industry leading track resistant silicone rubber housing.
This exclusive Group Electric patented manufacturing process forms a secondary moisture seal under the primary silicone rubber housing seal, which makes the arrester impervious to moisture and capable of withstanding extreme electrical, environmental and cantilever load conditions. The composite wrapped polymer-housed surge arrester design represents a quantum leap in polymer arrester technology. lightning arrester
Figure 1. Cutaway illustration of an polymer-housed surge arrester.
Arrester Type | YH5W | YH10W |
System Application Voltages | 3-36 kV | 3-36 kV |
Rated Arrester Voltages, Ur | 3-36 kV | 3-36 kV |
Power System Frequency | 50-60 Hz | 50-60 Hz |
Applicable Design and Test Standard | IEC 60099-4 | IEC 60099-4 |
Nominal Discharge Current | 5 kA | 10 kA |
Line Discharge Class | - | 1 |
High Current Withstand | 65 kA | 100 kA |
Pressure Relief Class | 20 kA (rms Sym.) (B) | 20 kA (rms Sym.) (B) |
Maximum Energy, 2000 μs Square Wave (Repeatable 1 min) | 2.85 kJ/kV Uc | 2.85 kJ/kV Uc |
High Current, Short Duration Energy Handling | (65 kA) 3.17 kJ/kV Uc | (100 kA) 3.9 kJ/kV Uc |
Features
The silicone rubber housing has undergone a wide range of design tests to determine the optimum shed configuration. In addition, long term environmental testing has verified the lifetime superiority of silicone rubber when compared to other polymeric insulating materials.
Independent laboratory tests have verified the superiority of silicone rubber in terms of hydrophobicity, resistance to UV and surface tracking performance in contaminated environments, chemical inertness, temperature stability and other key insulating properties.
Silicone rubber will not support biological growth (algae and mildew) and is non-flammable.
A ground lead disconnector is optionally available for use on systems having 20 A or more of available fault current. The disconnector will sense and disconnect the ground terminal in the unlikely event of arrester failure, preventing a permanent system short circuit. A disconnector that has operated gives a visual indication of internal arrester damage and the need for arrester replacement. See Figure 2 for the disconnector operating characteristics.
Operation
The operation of the polymer-housed surge arrester is typical of gapless metal oxide arresters. During steady state conditions, line-to-ground voltage is continuously across the arrester terminals. When overvoltages occur, the surge arrester immediately limits the overvoltage to the required protective level by conducting only the necessary level of surge current to earth.
Upon passage of the overvoltage condition, the surge arrester returns to its initial condition once again, conducting only minimal leakage current.
Design testing lightning arrester
The housing material, internal components and hardware work as a system and stand up to years of exposure to environmental extremes. To assure a superior level of performance, the components and the assembled arrester units have been subjected to a testing program that accurately simulates years of exposure to field conditions. Tests include:
• IEC 60099-4 Testing - Full certification to performance requirements by an independent laboratory has been completed.
Routine tests
A complete automated production test program ensures a quality product. Each metal oxide varistor receives a series of electrical tests. Quality is further demonstrated by tests performed to destruction on samples from every lot of varistors.
Listed are the varistor tests performed in accordance with IEC 60099-4:
• Physical Inspection
• Discharge Voltage
• V1mA/cm2
• Leakage Current at 80% of V1mA/cm2 Voltage
• High Current, Short Duration Withstand
• Thermal Stability
• Aging
Each fully assembled polymer-housed surge arrester must pass the following routine tests:
• Physical Inspection
• Reference Voltage Test
UNS Iref = 3 mA
UHS Iref = 4 mA
• Partial Discharge Test
@ 1.05 x Uc ≤ 10 pc
General application recommendations
The rating of an arrester is the maximum power frequency line-to-ground voltage at which the arrester is designed to pass the IEC operating duty test. Table 1 provides a general application guide for the selection of the proper arrester rating for a given system voltage and system grounding configuration.
Gapless surge arresters must be selected with sufficient steady-state self impedance to withstand the application of line-to-earth power frequency voltages under all system conditions of operation.
Continuous voltage
A preliminary selection that is based on selecting an arrester having a "Continuous Operating Voltage", or Uc, that equals or exceeds the normal system maximum line-to-earth operating voltage is made. Reference IEC 60099-5.
Power-frequency overvoltages
The second application criterion to be met is a condition established by the effectiveness of system grounding. During a single line-to-earth fault, under maximum system voltage conditions, the arrester selected should have a "Rating" (Ur) that will not be exceeded by the voltages on the unfaulted phases at the point of arrester application. One must pay particular attention to systems having low coefficients of grounding, ungrounded systems and systems that are resonant grounded or that may become ungrounded under abnormal conditions of operation. This second voltage consideration may be modified for various system conditions as long as the application does not violate the selected arrester's "Temporary Overvoltage Capability (TOV)" (see Figure 3).
Temporary system conditions resulting in sinusoidal power frequency voltages that exceed arrester "Continuous Operating Voltage, (Uc)" or even "Arrester Rating, (Ur)" can be allowed. Consider the permissible magnitude and duration of these overvoltages (including the full time of system back-up protection), with appropriate allowances for any recent arrester discharge energies.
The voltage withstand capability application on ungrounded systems is 1.035 per unit of COV (Uc) for 24 hours. Systems which permit earth faults to remain undetected or operate with one phase earthed for periods in excess of 24 hours will require the use of an arrester having a Uc (continuous capability) equal to the system maximum phase-to-phase voltage.
Under some special system conditions, such as transformer energization using certain types of connections and ferroresonance, higher voltages can be experienced by the arrester.
Consult with your Watt Electric representative to have your individual system application needs reviewed.
Performance test characteristics
Polymer-housed surge arresters meet the following design tests as described by IEC 60099-4:
• Operating Duty Test:
YH5W-twenty (20) current surges of 5 kA, 8/20 μs waveshape followed by two (2) high current surges of 65 kA crest (4/10 μs).
YH10W-twenty (20) current surges of 10 kA, 8/20 μs waveshape followed by two (2) high current surges of 100 kA crest (4/10 μs).
• Long Duration Current Impulse Withstand Test:
YH5W-eighteen (18) current surges of 75 A, 1000 μs duration.
YH10W-eighteen (18) current surges of the energy associated with the line parameters for IEC Class 1 performance (approximately 250 A, 2000 μs).
Following each of these tests, the arresters remain thermally stable as verified by:
• Continually decreasing leakage current values during a thirty minute power monitoring period when energized at Uc.
• No evidence of physical or electrical deterioration.
• The In (5 kA or 10 kA) discharge voltage measured after each test changed less than 5% from the initial values.
Full IEC 60099-4 certification has been completed and independently verified.
Table 1. Commonly Applied Voltage Ratings (Ur)
System Voltage (kV rms) | Arrester Rating -- Ur (kV rms) |
Nominal | Maximum | Four-Wire Star Multi- Grounded Neutral | Three-Wire Star Solidly Grounded Neutral at Source | Delta. Ungrounded, & Resonant Impedance Grounded Star |
3.3 | 3.7 | 3 | 6 | 6 |
6.6 | 7.2 | 6 | 9 | 9 |
10.0 | 11.5 | 9 | 12 | 12-15 |
11.0 | 12.0 | 9-10 | 12 | 12-15 |
16.4 | 18.0 | 15 | - | 18-21 |
22.0 | 24.0 | 18-21 | 24 | 24-27 |
33.0 | 36.3 | 27-30 | 36 | 36-36 |
Pressure relief (fault current withstand tests)
These tests demonstrate the ability to withstand fault currents for specific durations.
All polymer-housed surge arresters have been tested in accordance with the requirements listed in IEC 60099-4 and are non-fragmenting to the levels shown in Table 2.
Table 2. Pressure Relief Tests
Arrester Type | IEC Preasure Relief Class | Fault Current Amplitude (kA rms) Sym. | Minimum Fault Current Duration (Seconds) |
YH5W/YH10W | B | 0.8 | YH5W/YH10W |
Our Services
1. We are always online, 24hours 7days.
2. Customized products can be made as your design.
3. The Company had passed the inspection of ISO 9001. The 36kv load break switch had tested by the professional labs.
4. All the switch disconnectors are according with IEC standards.
Company Information
Watt Electric Group Limited professional produce the 12kV 24kV 35kV Air Load Break Switch, Gas Load Break Switch, Vacuum Circuit Breaker, Fuse, Surge Arrester, etc.
We located in Yueqing Centre Industrial Zone, and has more than 20 years experience in the power system areas. And export to the countries around the world.
We had passed the ISO 9001 inspection. The products controled by strick quality control system, and type tested by the authority lab., that can make sure all the load break switch, disconnector which you get in hand is safty to use.