Alternatives for blocking direct current in AC system neutrals at the Radisson/LG2 complex

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.141850· OSTI ID:7050540

Eitzmann, M A; Walling, R A; Sublich, M; Kah, A ^[1]; Huynh, H; Granger, M; Dutil, A ^[2]

---

1. GE Industrial and Power Systems, Power Systems Engineering Dept., Schenectady, NY (US)
2. Hydro-Quebec, Montreal, Quebec (CA)

Severe offset saturation results from the passage of direct current through power transformers. Such direct current can arise from geomagnetic disturbances, or resistive coupling of the substation ground to HVDC earth electrodes. This paper documents the development of alternative approaches for the design and application of blocking devices placed between transformer neutrals and the substation ground. System constraints on the impedance and overvoltage limitation of the neutral blocking device (NBD) are covered. Three alternative NBD schemes are developed and optimized. System performance of the NBD is discussed, as are the practical implementation considerations for this unconventional equipment application. Although the paper focuses on the NBD requirements of Hydro-Quebec's Radisson/LG2 complex, the fundamental information is applicable to any situation where dc must be clocked from a power transformer neutral in a system designed for effectively-grounded operation.

• OSTI ID: 7050540
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Vol. 7:3; ISSN 0885-8977
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
CURRENT LIMITERS
DESIGN
GEOMAGNETIC FIELD
ENVIRONMENTAL EFFECTS
QUEBEC
HVDC SYSTEMS
TRANSFORMERS
PERFORMANCE TESTING
CONSTRAINTS
DIRECT CURRENT
ELECTRIC IMPEDANCE
ELECTRODES
OPERATION
OVERVOLTAGE
POWER TRANSMISSION
SOILS
SYSTEMS ANALYSIS
CANADA
CURRENTS
DC SYSTEMS
DEVELOPED COUNTRIES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
EQUIPMENT
IMPEDANCE
MAGNETIC FIELDS
NORTH AMERICA
POWER SYSTEMS
TESTING
240100* - Power Systems- (1990-)
240202 - Power System Networks
Transmission & Distribution- DC Systems- (1990-)
240500 - Power Transmission & Distribution- Environmental Aspects- (1990-)