Figure 1 — Delta-delta transformer connection The voltages on primary and secondary sides can be shown on the phasor diagram Figure 2:
Dear Sir, I’m facing some problem about PF,I install a APFC panel to maintaing PF but PF is not maintaining becoz i connect one CT on R phase for sensing of PF control relay on T/F outgoing (LT Side) & now i connect a load manager to check PF of plant & 3 No. CT put on R,Y & vetconnexx.com CT of R phase i was put on between CT of APFC Relay & T/vetconnexx.com in this sititution PF was not maintain? Welcome To HighVolt Power: High Volt Power & Control Systems Pvt. Ltd is a trustworthy manufacturer of medium voltage panels including ABB, HT Panel, VCB Panel, LT Panel etc. Notices/ Correspondences with Stock Exchange(s) Intimation - 27th Board Meeting - ; Intimation - 25th Board Meeting - ; Intimation to Stock Exchange under Regulation 30 of SEBI (LODR) Regulations,
Apfc relay 1 — Delta-delta transformer connection The voltages on primary and secondary sides can be shown on the phasor diagram Figure 2: Figure 2 — Phasor diagram of delta delta transformer connection This connection proves to be economical for large low voltage transformers as it increases number of turns per phase.
No phase shift between primary and secondary voltages. Advantages of Delta-Delta Transformer Connection Sinusoidal Voltage at Secondary In order to get secondary voltage as sinusoidal, the magnetizing current of transformer must contain a third harmonic component. The delta connection provides a closed path for circulation of third harmonic component of current.
The flux remains sinusoidal which results in sinusoidal voltages. Economical for Low Voltage Due to delta connection, phase voltage is same as line voltage hence winding have more number of turns. Hence the cross-section of the windings is very less. This makes the connection economical for low voltages transformers.
Absent of Third Harmonic Voltage Due to closed delta, third harmonic voltages are absent. The absence of star or neutral point proves to be advantageous in some cases.
Disadvantages of Delta-Delta Transformer Connection Due to the absence of neutral point it is not suitable for three phase four wire system. More insulation is required and the voltage appearing between windings and core will be equal to full line voltage in case of earth fault on one phase.
Application Suitable for large, low voltage transformers. This type of connection is normally uncommon but used in some industrial facilities to reduce impact of SLG faults on the primary system.
It is generally used in systems where it need to be carry large currents on low voltages and especially when continuity of service is to be maintained even though one of the phases develops fault.HT VCB Control Panels. 11/33KV Vacuum Circuit Breaker Indoor Panel that is used for the protection of transformer.
VCB panels are precisely designed following strict industry parameters and are appreciated for features like superior quality and cost effectiveness. Automatic Power Factor Controllers. L&T offers you a wide range of Power factor Correction Relays suitable for all standard applications.
Their intelligent adjustment interface ensures balanced usage of capacitors based on the number of switching operations and the connection time of each step, thus ensuring long life for switchgear and capacitors.
Know more about the Products offered by Electrical & Automation in India. APFC Relays L&T offers you a wide range of Power factor Correction Relays suitable for all standard applications. Their intelligent adjustment interface ensures balanced usage of capacitors based on the number of switching operations and the connection time of each step, thus ensuring long life for switchgear and capacitors.
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