Isolation resistance Sample Clauses

Isolation resistance. This paragraph shall not apply to electrical circuits that are galvanically connected to each other, where the DC part of these circuits is connected to the electrical chassis and the specific voltage condition is fulfilled.
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Isolation resistance. 5.1.3.1. Electric power train consisting of separate Direct Current- or Alternating Current-buses If AC high voltage buses and DC high voltage buses are galvanically isolated from each other, isolation resistance between the high voltage bus and the electrical chassis shall have a minimum value of 100 Ω/volt of the working voltage for DC buses, and a minimum value of 500 Ω/volt of the working voltage for AC buses. The measurement shall be conducted according to Annex 4A "Isolation resistance measurement method for vehicle based tests".
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Isolation resistance. This paragraph shall not apply to chassis connected electrical circuits where the maximum voltage between any live part and the electrical chassis or any exposed conductive part does not exceed 30 V AC (rms) or 60 V DC.
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Isolation resistance. If the electrical circuit divided by the disconnect function includes AC circuit, this part of the high voltage bus shall be considered as an AC high voltage bus. If the electrical circuit divided by the disconnect function doesn't include AC circuit, this part of the high voltage bus shall be considered as a DC high voltage bus. For AC high voltage buses, isolation resistance between the high voltage bus and the electrical chassis shall have minimum value of 500 ohms/volt of working voltage. If the protection degree IPXXB is satisfied for AC portion of the high voltage buses after crash, isolation resistance between the high voltage bus and the electrical chassis shall have minimum value of 100 ohms/volt of working voltage. For DC high voltage buses, isolation resistance between any high voltage bus and the electrical chassis shall have minimum value of 100 ohms/volt of working voltage.
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Isolation resistance. The isolation resistance between the high voltage bus and the electrical chassis may be demonstrated either by measurement or by a combination of measurement and calculation. The following instructions should be used if the isolation resistance is demonstrated by measurement. Measure and record the voltage (Vb) between the negative and the positive side of the high voltage bus (see figure 1); Measure and record the voltage (V1) between the negative side of the high voltage bus and the electrical chassis (see figure 1); Measure and record the voltage (V2) between the positive side of the high voltage bus and the electrical chassis (see figure 1); If V1 is greater than or equal to V2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (V1’) between the negative side of the high voltage bus and the vehicle electrical chassis (see figure 3). Calculate the isolation resistance (Ri) according to the formula shown below. Ri = Ro*(Vb/V1’ – Vb/V1) or Ri = Ro*Vb*(1/V1’ – 1/V1) Divide the result Ri, which is the electrical isolation resistance value in ohm (Ω), by the working voltage of the high voltage bus in volt (V). Ri (Ω / V) = Ri (Ω) / Working voltage (V) Figure 3 Measurement of V1' If V2 is greater than V1, insert a standard known resistance (Ro) between the positive side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (V2’) between the positive side of the high voltage bus and the electrical chassis (see figure 4). Calculate the isolation resistance (Ri) according to the formula shown below. Ri = Ro*(Vb/V2’ – Vb/V2) or Ri = Ro*Vb*(1/V2’ – 1/V2) Divide the result Ri, which is the electrical isolation resistance value in ohm (Ω), by the working voltage of the high voltage bus in volt (V). Ri (Ω / V) = Ri (Ω) / Working voltage (V) Figure 4 Measurement of V2' Note 1: The standard known resistance Ro (in Ω) should be the value of the minimum required isolation resistance (Ω/V) multiplied by the working voltage (V) of the vehicle plus/minus 20 per cent. Ro is not required to be precisely this value since the equations are valid for any Ro; however, a Ro value in this range should provide a good resolution for the voltage measurements.
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