Resistance isolation Sample Clauses

Resistance isolation. The following instructions may be used if isolation resistance is measured. Before the vehicle crash test, measure and record the high voltage bus voltage (Vb) (see Figure 1). Vb must be equal to or greater than the nominal operating voltage as defined by the vehicle manufacturer. It is acceptable for vehicle manufacturer to elect to calculate or simulate this value instead of measuring this after the crash. 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 2). Calculate the isolation resistance (Ri) according to the formula shown. Divide this electrical isolation resistance value (in ohms) by the working voltage of the high voltage bus (in volts). Ri = Ro*(Vb/V1’ – Vb/V1) or Ri = Ro*Vb*(1/V1’ – 1/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 3). Calculate the isolation resistance (Ri) according to the formula shown. Divide this electrical isolation value (in ohms) by the working voltage of the high voltage bus (in volts). Ri = Ro*(Vb/V2’ – Vb/V2) or Ri = Ro*Vb*(1/V2’ – 1/V2) NOTE 1: The standard known resistance Ro (in ohms) should be approximately 500 times the working voltage of the vehicle (in volts). Ro is not required to be precisely this value since the equations are valid for any Ro; however, an Ro value in this range should provide good resolution for the voltage measurements.
Sample 1
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