METROSIL ZB9411015 high-impedance relays

Description

METROSIL ZB9411015 high-impedance relays：

In some applications of high-impedance relays, nonlinearity requires Metrosil resistance to limit the safe level of the secondary voltage of the current transformer (CT) under fault conditions. M&l Materials LTD supplies a wide variety of Metrosils to provide such protection. This data sheet will help you specify the correct Metrosil device for your relay. First, you need the following information:
1.CT rating 1A or 5A is the most common value.
⒉ Voltage setting relay is also known as stable voltage, this is the voltage (through the stable resistance + relay), above the relay will trigger.
3. Maximum secondary internal fault current This is the maximum possible secondary current that occurs during a primary server failure. This can be determined by the ratio of primary fault current to CT, which is usually less than 150 weapons.
4. Maximum Allowable voltage under Minor Fault conditions During a fault, Metrosil will automatically limit any overvoltage. Typically, the peak is between 1 and 3.5 kV in clamping conditions.
5. The maximum allowable current set voltage through the relay Metrosi. During normal operation, the relay Metrosil leaks very little current. Since the subway runs parallel to the torch relay, it is important to account for leakage so that the relay can operate at the correct voltage/current.
Choose the right subway
The steps to select the correct Metrosil relay type are divided into the following 5 steps :- Step 1 – Determine the correlation table for the application The maximum internal secondary fault current can be up to 50Arms(usually 1A ct) applicable to Table 1(see page 3). Maximum internal secondary fault current up to 150 arms (generally 5A ct) applies to Table 2(see page 3).
The difference between 1A and 5A devices is based on typical fault current requirements. Using a is acceptable for 1AMetrosil devices with 5ACT or vice versa, as long as the rated secondary fault current does not exceed all other parameters set reasonably.
Step 2- Determine Metrosil type from ‘typical relay set voltage’ range and ‘rated maximum current’, determine recommended Metrosil type from Table 1 or Table 2 using columns 2 and 5. Find a relay setting voltage close to the one you need. If your set voltage is lower than the given example voltage, the corresponding leakage current will degrade the device. If desired, these values can be more accurately determined in steps 3 and 4. For 1A CT, it is necessary to decide whether the single-pole or three-pole (three-phase)Metrosil type is required.
Step 3- Check the maximum allowable leakage when the relay sets the voltage, check the maximum voltage identified by the Metrosil type of leakage current in the allowable limit of the relay system. This can be done – calculated directly from column 3 of Table 1 or Table 2 or from Equation 1, taking the minimum value of C as type Metrosil with beta value of 0.25

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METROSIL ZB9411015

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