UL 1004-9 2021 pdf download – Form Wound and Medium Voltage Rotating Electrical Machines.
5 Glossary 5.1 For the purpose of this Standard, the following definitions apply. 5.2 CYCLOALIPHATIC EPOXY – Epoxy resin consisting of two components that react with each other forming a hard, inert material. Cycloaliphatic epoxies (where “cycloaliphatic” is used as the curing agent) are noted for higher resistance to moisture and UV breakdown compared with non-cycloaliphatic epoxies. 5.3 FORM WOUND MACHINE – A rotating electrical machine using insulated rectangular shaped conductors that are wrapped with additional electrical insulation over the entire coil prior to insertion and are precisely positioned and formed into coils. 5.4 RANDOM WOUND MOTOR – A motor using insulated round magnet wire conductors in which the winding turns occupy random positions in a slot. 5.5 RTD/ETD – Resistance Temperature Detector/Embedded Temperature Detector installed within the machine near the windings to measure temperatures (when used as a measurement device for the Temperature test). CONSTRUCTION 6 Spacings 6.1 Machines rated 1,000 Vor less 6.1.1 Machines with rated voltages not exceeding 750 V shall comply with the spacing requirements in the Table for “Minimum acceptable spacings at field wiring terminals for voltages up to 750” of UL 1004-1. Machines with rated voltages between 751 V and 1,000 V shall comply with the spacing requirements in the Table for “Minimum acceptable spacings at field wiring terminals for voltages over 750” of UL 1004-1.
9.2 The applied potential is to be gradually increased until the required test value is reached. 9.3 Accessory devices (such as space heaters, thermostats, thermocouples, thermistors, RTDs, ETDs, and the like) in contact with the winding but supplied from a separate circuit, are to be connected to the frame or core during machine winding high-potential tests. 9.4 During the accessory testing, all other machine windings and components shall be connected together and to the frame or core. 10 Temperature Test 10.1 The Temperature Test is to be conducted with the machine under test supplied with rated voltage and delivering full rated output power multiplied by any service factor. Exception No. 1: Alternatively, the machine may be tested using any ofthe test methods described in IEC 60034-29, Rotating electrical machines – Part 29: Equivalent Loading and Superposition Techniques – Indirect Testing, or test methods under the Temperature Test of IEEE 112, Standard Test Procedure for Polyphase Induction Machines and Generators. Exception No. 2: For motors greater than 500 hp where the test cannot be conducted at rated output, the tests can be conducted at points below rated load to extrapolate a calculated temperature rise at rated output. Exception No. 3: Othermethods ofloading the machine and measuring temperatures may be employed if found to yield equivalent results. 10.2 The Temperature Test is to be conducted until thermal stabilization is attained. Following stabilization, the temperatures on the windings shall not exceed the maximum temperatures specified in Table 10.1. Temperatures may be measured using the thermocouple, RTD/ETD, or the change-of- resistance method.