
65KA 100KA Lightning arrester for electrified railway protection
Measurement of insulation resistance of lightning arrester
The measurement of insulation resistance, for the FS-type lightning
arrester, is mainly to check the seal situation, if the seal is not
strict will inevitably cause internal dampness, so that the
insulation resistance obviously decreased. In accordance with the
pre-test procedure, the measurement shall be carried out by testing
the 2500V megabyte meter, and the insulation resistance shall be
not less than 2500M. Clean the surface of the lightning arrester
before testing, otherwise the leakage current on the coat surface
will affect the accuracy of the test. For this purpose, the surface
of the porcelain cover should be cleaned with a clean, absorbent
cloth before the test, and a thin metal wire is used to circle the
underside of the first underskirt of the coat, which is then
connected to the mew watch "shield" terminal column to eliminate
the effect. In the test, the Meow watch should be connected with
the lightning arrester as short as possible and the electrical
contact should be good. The mew watch should be placed
horizontally, the speed should be uniform, and 120 revolutions per
minute should be used to obtain good measurement results.
For FZ lightning arrester, in addition to checking whether the interior is damp, check whether the shunt resistor is broken and aging, if the shunt resistor is old and broken, because of poor contact, the insulation resistor will increase. To ensure that measurements are accurate, measurements should be made twice and the data should be compared for any changes. Measurement should be done using the same meioEurope meter at the same voltage level, otherwise comparison is not possible.
DC 1 mA reference voltage test
Apply 0.75 times 1 mA DC voltage(DC voltage pulsation rate not
greater than 1.5 %) to both ends of the arrester when the current
through the arrester is stabilized at 1 mA. The voltage at both
ends of the lightning arrester shall not be less than 25 kV.
DC Leakage Current Test
After 0.75 times 1 mA DC voltage is applied at both ends of the
lightning arrester at test time, the leakage current passing
through the lightning arrester should not be greater than 50mA.
During the test, when the leakage current reaches 30 Mu A and the
voltage continues to increase, the leakage current will increase
sharply. In order to prevent the effect of leakage current on the
surface of the ceramic cover, the outside surface of the cover
should be cleaned with a cloth with good absorbency before testing
to eliminate the effect.
Measurement of conductance current of lightning arrester with parallel resistance
Rated Voltage | Work Voltage | AC Current |
35KV | 54kV | 5A |
21kV | 62kV | 10A |
WENZHOU QIUPU ELECTRIC POWER CO., LTD.
Wenzhou Qiupu Electric Power Co., Ltd. is located in Yueqing
Economic Development Zone, Zhejiang Province. It is a high-tech
enterprise specializing in the research and development, production
and sales of electric power products such as circuit breakers,
transformers, power distribution switches and high and low voltage
electrics. Our products are widely used in financial,
communications, municipal, transportation, power, construction,
aerospace, industrial control and other important areas, has won
the majority of users praise and signed a long-term cooperation
agreement.
As an innovative technology-based
enterprises, the company has strong technical force and the world's
leading production technology and high-end testing equipment, and
establish and improve the procurement of components, product
processing assembly, testing, packaging to sell a complete set
Quality management system to ensure that every product of the
eligibility, the company has 10 years of experience in the power
industry, and is still growing, product and sales network
throughout the country.