    (1) Measurement of insulation resistance.
    (2) Measurement of the difference in nonlinear factor between the electrically conductive flow and the series combination.
    (3) Test of power frequency discharge voltage.
    (4) Measurement of the insulation resistance of the base.
    (5) Check the operation of the discharge counter.
    (6) Check the seal.
First, the measurement of insulation resistance
    Ordinary valve arresters are divided into two types without parallel resistance (ie FS type) and with parallel resistance (ie FZ type). Magnetic blow arresters are divided into substation (ie FCZ type) and rotary electric machine (ie FCD type) two categories. The measurement and requirements of the insulation resistance are different.
    Measuring the insulation resistance of the FS arrester can effectively detect the damage of the arrester such as moisture or porcelain sleeve crack; measuring the insulation resistance of the FZ, FCD, FCZ arrester can not only check the internal moisture, porcelain crack, but also check whether the parallel resistance contact is good, Whether aging deteriorates or breaks.
    The insulation resistance was measured using a 2500V megger. For FS type arresters, the insulation resistance should not be lower than 2500MΩ; for FZ, FCZ and FCD type arresters, the insulation resistance is self-regulated, but there should be no significant change compared with the previous or same type of measurement data.
    The insulation resistance of the measuring base is mainly to check the insulation condition of the base, and the measurement is performed by a 2500 megohm meter, and the measurement result is judged by a comparison method.
Second, the electric conductivity flow and the nonlinear factor difference test of the series combination components
    The electric current of the arrester refers to the current flowing through the body of the arrester when a certain DC voltage is applied across the shunt resistor. (See Figure 13-1). The purpose of measuring the electric current is to check whether the shunt resistor of the arrester is damp, aging, or broken. , poor contact and non-linear factors match. The "pre-regulation" stipulates the electrical conductivity flow reference value of the FZ, FCZ, FCD type arrester, and the measured electrical current flow should be within the specified range. If it is obviously too large, it indicates that the inside of the arrester is damp or the moisture in the porcelain cavity; if it is obviously too small, it indicates that the parallel resistance is broken or the contact is poor. If it is decreased year by year, the parallel resistance is deteriorated.
    The definition of the nonlinear factor α is:
α=lg(U 2 /U 1 )/lg(I 2 /I 1 )
    Wherein U 1, I 1 --50% a predetermined test voltage (see Table 13-1) and the conduction current value of this voltage;
          U 2 , I 2 - specifies the test voltage (see Table 13-1) and the value of the electrical conductance at this voltage.
    The nonlinear factor difference is the difference between the nonlinear factors of two elements in the same series element group, ie
△α=α1—α2
    The "pre-regulation" requires that the nonlinear factor difference of the series-connected components in the same phase should not exceed 0.05 (generally 0.35-0.45); the electrical conductivity phase difference (%) should not exceed 30%. When Δα exceeds 0.05, the power frequency distribution unevenness of each component is more serious, which will affect the arc extinguishing performance of the arrester.
    It should be pointed out that the electrical conductivity value specified by the general manufacturer refers to the value at 20 ° C, and the temperature measured in the field is generally 5-40 ° C. For comparison, temperature conversion should be performed. The conversion formula is
I 20°C = I t [1+K(20-t)]
    Where I t - the value of the electrical conductivity when the temperature is t, μA;
        I 20 ° C - the electrical conductivity value converted to 20 ° C, μA;
        K——The temperature coefficient is 0.003 for Xi'an Electric Porcelain Factory, 0.004 for Fushun Electric Porcelain Factory and 0.005 for other factories.
    The electric conduction flow phase difference (%) refers to the ratio of the difference between the maximum electric conduction current and the minimum electric conduction flow of the series element or the parallel resistance to the maximum value.
Third, the test of power frequency discharge voltage
    In this test, only the FS type arrester was tested in the preventive test. For the FZ, FCZ and FCD type arresters, the test was carried out only after disassembly and overhaul.
    The purpose of this test is to check whether the structure and characteristics of the spark gap are normal and to verify the reliability of the action under overvoltage. The test wiring is shown in Figure 13-2, which is the same as the general AC withstand voltage test.
    The "pre-regulation" specifies the range of the power-frequency discharge voltage of the FS type, FZ type and FCZ type arrester. The allowable range of the power-frequency discharge voltage of the FS type arrester is shown in Table 13-2.
    The measured power frequency discharge voltage should be within the allowable range. If the measured voltage value is high or low, the cause should be identified and measures taken to eliminate the cause. For example, the high is often due to insufficient pressure of the internal compression spring; the O-ring mica is layered; the low is often the spark gap is damp, the O-ring mica insulation resistance is reduced, the spring pressure is too large.
Fourth, check the discharge counter action
The discharge counter can record the number of times the arrester operates and moves during operation to accumulate data and analyze the overvoltage condition of the power system.
    The inspection test includes an alternating current method, a direct current method, a standard inrush current method, and a lightning arrester discharge counter operation tester method.
    In the field, the DC method can be used for inspection and testing, which is relatively simple and easy. Use a 2500V megohmmeter to charge a 4~8μF capacitor, then discharge it through the discharge counter with a capacitor. The counter should be operated. During the test, the capacitor should be prevented from recharging the megohmmeter and damage the megohmmeter. The discharge counter test should be recorded. The number of discharge indications before and after, the test should be 3~5 times, and all should be normal. After the test, the counter indication should be adjusted to zero. Conditional units can also be checked by the arrester discharge counter action tester.
IEEE 1394/Firewire Connector Overview
The IEEE 1394 connector series is capable of accommodating data rates up to 400 megabytes per second for serial transmission-consists of six-position connectors (for connections of computers to peripherals), and four-position connectors (for connections of digital AV equipment. We offer a screw thread size of M1.6 and two types of headers: dual inline package (DIP) and surface-mount technology (SMT). These four-position connectors help us manage a wide range of device designs and are suitable for DVD, set-top box, etc. The cable assemblies are also available with four-position to four-position type, for connection of AV equipment; four-positions to six-positions of transition type, for connections of PC and AV equipment; and six-position to six-position type for connections of PC and peripherals.
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Conforms to IEEE 1394 standard
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For 0.8mm and 1.6mm PC boards, M1.6 and M2.1 (4-position) panel mounting screw thread sizes
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Fire Wire (IEEE 1394) Connector Wire to Borad Connectors
No of Contacts 4, 6, 9
Type
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IEEE1394 (Firewire) interface, IEEE1394 is a serial standard. .Like USB, IEEE1394 also support hotplug peripherals and can provide power for peripherals,
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