TECHNICAL DATA TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER HM0.154.1901 SHANGHAI HUAMING POWER EQUIPMENT CO., LTD.

TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER TECHNICAL DATA 1. General⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯3 2. Technical specifications⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯4 3. Type explanation⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯5 4. Terms and definitions⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7 5. Special designs⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯12 6. Motor drive units⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯13 7. Operation controllers⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯14 8. Accessories⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯14 9. Appendixes⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯15...

Appendix 27 CMD (10191W) operating position table and connection diagram⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯42 Appendix 28 CMD (10191G) operating position table and connection diagram⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯43 Appendix 29 CMD (10193G) operating position table and connection diagram⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯44 Appendix 30 CMD (14271W) operating position table and connection diagram⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯45 Appendix 31 CMD bell-type head flange, overall dimensions⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯46 Appendix 32 CMD bell-type head flange with pressure relief valve, overall dimensions⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯47 Appendix 33 CMD supporting...

1. General Type CMD on-load tap changer (herein referred as tap changer) is of combined structure, applicable to oil-immersed voltage regulating transformers. The tap changer is composed by diverter switch and tap selector, which is an intank structure mounted inside the transformer. Diverter switch is in a separate oil compartment. Tap selector is in the same oil as the windings in transformer tank . Tap changer is to be mounted on transformer tank top by means of bell type mounting through a top flange. Tap changer is operated by a motor drive unit. Tap changer and motor drive unit are connected...

2. Technical specifications Type CMD on-load tap changer complies with IEC 60214-1:2003 standard. Tap changer technical specifications are listed in Table 1 below. Table 1 Type CMD Series of On-Load Tap Changer Technical Specification Item Max. rated through current (A) Max. rated step voltage (V) Rated step capacity Short-circuit current test (kA) TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER TECHNICAL DATA 50 or 60 3-phase Y-connection for neutral point only 3300 Single-phase for any selectable winding connection Dynamic (peak) Max. operating positions Insulation to earth 14 without change-over...

3. Type explanation 3.1. Type designation Due to the different combinations of no. of phases, maximum rated through current, the highest voltage for equipment, tap selector size and connections, type CMD comes with various models. Hence, the type designation shall provide all the above technical parameter and below is its detailed explanation. CMD III - 600 Y / 126 C - 10193W Tap selector basic connection method Tap selector size The highest voltage for equipment (kV) OLTC connection method (Y for neutral point only) Max. rated through current (A) No. of phase Product type Fig. 2 Tap Changer...

TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER TECHNICAL DATA Fig. 4 Tap Selector Basic Connection diagram

3.3. Tap selector basic connection diagram Different transformer tapping corresponds to different tap selector basic connection diagrams. Fig. 4 shows common basic connection diagrams. Special requirement can also be specially designed. 4. Terms and definitions 4.1. Through-current Rated through current IU: The current flows through an on-load tap changer toward the external circuit, which can transferring from one tap to the other at the relevant rated step voltage and which can be carried continuously while meeting the requirement. Maximum rated through-current Ium: The highest rated through-current...

(S>Hm TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER TECHNICAL DATA The electrical life of type CMD OLTC relates to the current it breaks. Hence the electrical life can be estimated by its relative load. However, as the actual wear of the arcing contact is also subject to various factors during field operation, such as the contact material, transition resistors matching, etc, only the approximate value of electrical life can be given ( as the shadow area in Fig. 6) n: Number of operation Iu: rated through-current Ium: the maximum rated through-current 4.4. Breaking capacity According to stipulations...

®>Hin 4.6. Short-circuit current test According to IEC 60214-1: 2003, all contacts continuously carrying the current shall be able to withstand 2s (±10%) short circuit test current without melting, deformation or mechanical damage. Meanwhile the starting peak current value shall be 2.5 (±5%) times of the root means square value of rated short circuit test current. Refer the short circuit test current values to Table 1. Type CMD Series On-Load Tap Changer Technical Specification. 4.7.1. Service temperature range of tap changer in oil is -25°C ~ +100°C 4.7.2. Service ambient air temperature range...

Linear Regulation TYPE CMD OIL-IMMERSED ON-LOAD TAP CHANGER TECHNICAL DATA Coarse/Fine Regulation Reversing Regulation Spark Protection Gap ( I≤600A) Zinc Oxide Varistor ( I≥1000A) a: between start and end of a fine tap winding; also between start and end of coarse tap winding; b: between any tapping of different fine tap windings, or between ends of different coarse windings; a0: between selected and preselected of the diverter switch tapping; a1: between any selected and preselected taps of the tap selector c1: between the start of coarse tap winding and the current take-off terminal for the...

®>Hin 4.9. Tap changer insulation level to earth Tap changer insulation level is the insulation between tap changer live part and grounding part. It is determined by dielectric tests according to IEC-60214-1-2003. The requirement correlates to the transformer tap winding location, regulation range & regulation method, winding connection & arrangement and rated voltage of transformer winding. It's decided by the insulation to earth of transformer tap winding. Table 3 Tap Changer Insulation Level to Earth (unit: kV) For tap changer with current of 1000A or above, only left-right model or less than...