TOPIC OF INTEREST

 

Results of previous autumn and winter period and tasks for future one

 

 

Gvozdev D.B.

, PJSC “ROSSETI” Chief Engineer

 

 

GUEST OF THE JOURNAL

 

Key to success is motivation to study.

Interview with

 

Chudov V.L.

,

1502 MPEI lyceum principal

 

 

SMART GRIDS

 

Saint-Petersburg power grid complex modernization

PJSC “ROSSETI”

 

ELECTRICAL POWER SUPPLY

 

Network reliability assessment of IDGC of Centre, PJSC divisions

 

 

Tereshko O.A.

, D.Sc., Professor, CJSC “MC CEU”

 

 

Innovation network has been constructed near Syktyvkar

IDGC of North-West, PJSC

 

Unplanned outages probability forecasting on the power grid facilities

PJSC “LENENERGO”

 

ENERGY EFFICIENCY

 

Load-balancing filter device for reducing of power losses caused by unbalanced currents and improving of power quality in 0.38 kV networks

 

Kosoukhov F.D., Vasilev N.V., Krishtopa N.Yu., Kuznetsova E.S.

 

0.38 kV power networks are operated in the unbalanced state, where power losses in the net- works are double and even higher than in the balanced state. For the purpose of power losses reduction, it is recommended to use load-balancing filter device containing three capacitor banks and a transductor amplifier. The operating winding of transductor amplifier is connected between neutral conductor of the network and capacitor banks neutral point. This operating winding and three capacitor banks are connected in series and configured to voltage resonance. As such, electric circuit has a small active resistance and provides load shunting. Due to a low zero sequence resistance of load-balancing filter device, it will shunt zero-sequence currents in the network, reducing line and transformer power losses and improving power quality. Some results concerning experimental investigation of load-balancing filter device are given. The investigation was executed on 0.38 kV three-phase network physical model at the Power Engineering and Electric Equipment Department of SPb SAU. Transmission line and transformer power losses research were carried out through criterion of power losses caused by current unbalance. The criterion was developed at the department of SPb SAU. According to research, in the most heavy loaded unbalanced state transformer power losses criterion is about 8 times less when connecting load-balancing filter device to the load bus (in the case of the network is close to nominal condition). Under the same conditions transmission line power losses criterion is about 3.5 times less.

 

Keywords:

three-phase power network, power losses, power quality, load-balancing filter device, power losses reduction, power losses criterion, experimental investigations

 

Package approach to reactive power management in 6–10 kV distribution network

Smolenskenergo, IDGC of Centre, PJSC division

 

Сomment:

Yakshina N.V.

 

 

MAINTENANCE AND REFURBISHMENT

 

Experience of interactive 3D model application in 220 kV substation

“Tetravizhn”, LLC

 

Сomment:

Smolentsev M.V.

 

 

OVERHEAD TRANSMISSION LINES

 

Сalculation of induced voltage caused by direct-axis component of electromotive force on deenergized overhead transmission lines located parallel with 110 kV and above overhead lines in operation according to the air core transformer calculation method

 

Belyakov Y.Р.

 

Electric current flow in the energized transmission line conductors generates an alternating magnetic field. In its turn, the magnetic field can produce electromotive force (EMF) when crossing conductors of transmission line under construction or repair. The induced voltage hence occupational safety depend on strength of current in the energized transmission line, distance between conductors of energized and repaired lines, as well as the length of wires and their relative position.

This article presents a method for induced voltages calculation in the wires of deenergized overhead lines which are located close to 110 kV and above overhead lines in operation. The method is based on the air core transformer theory (air core transformer is a transformer without ferromagnetic core). The method assumes that primary winding of transformer is a wire of an energized line and secondary winding is a wire of a parallel deenergized line.

Keywords: induced voltage, air core transformer, EMF of mutual induction, Carson’s formula

 

CABLE LINES

 

Special features of power transmission with 6–500 kV long AC cables

Dmitriev M.V.

 

Russia has already accumulated experience in the design, construction, and operation of XLPE cable lines. Apart from an application of this cable type to typical power supply schemes, group of engineers began to consider the possibility of using XLPE cables for more ambitious tasks as long AC cable lines construction. The article represents the possibility of long AC cable lines development.

Keywords: cable line, XLPE cable, power transmission, active power, reactive power, long transmission lines

 

XLPE cables thermal calculations. Part I. Permissible current loads

Poleshchuk S.I.

 

The article analyzes thermotechnical calculations of cables in existing regulatory documents. The mistakes made when translating these documents into Russian are shown. The formula for underground cables permissible current load used in regulatory documents is analyzed when partial drying of the soil. The inconsistency of this formula to the physical processes of heat dissipation in cables is shown. A formula for permissible current loads for three single-core cables laid in ground cable trays is proposed.

 

Keywords:

electric cables, current rating, thermal resistance, ambient temperature

 

Grounding of a cable shield in 20 kV networks

Expert opinion

 

RELAY PROTECTION AND AUTOMATION

 

Information support analysis of automatic process control system and relay protection and automation in the operating substations

MPEI, “SO UPS”, JSC, “FGC UES”, PJSC

 

Comparison of different options for construction of digital substation relay protection and automation

Voloshin A.A., Voloshin E.A., Blagorazumov D.O., Gracheva N.P., Tyapkin N.V., Charugina A.V.

 

Optimal structure of Local Area Network (LAN) synthesis algorithm and its software implementation with Python programming language have been developed in order to form LAN structure for process bus. Taking into consideration conducted investigations, the conclusions on suitability of different architectural options application for digital substation relay protection and automation have been made.

 

Keywords:

relay protection and automation, IEC 61850, local area network, digital substation, technical and economic assessment

 

С

omment:

Zhukov A.V.

 

 

The cornerstone of network reliability

Interview with Dolgov A.S., JSC “UNECO” Head of relay protection and automation department

 

“RIDUS PKI” portable instrument for fault searching in the operating DC voltage system is fast and reliable solution

“ElektroKontsept”, LLC

 

EQUIPMENT

 

110 kV high-voltage bushing checkout at a temperature of –200°C

“Izolyator” Company

 

ZETO cubicle switchboard as a reliable, simple and safety option

“ZETO”, CJSC

 

Operational fees. How to save on calibration

“SZTT”, JSC

 

E900EL conforms to all requirements

“Elektropribor”, JSC

 

Fire resistant bus wires in Russia

Interview with Cherenkov I.V., director general of “RTK-ELEKTRO-M” plant

 

Roxtec modular sealing systems for cable and conduit entries

“Rokstek RU”, LLC

 

DIAGNOSTICS

 

Special features of maintenance check for RNTA-35/320 load tap changer contactor by means of PKR-2M and MIKO-8 instruments

“SKB EP”, LLC

 

GLOBAL EXPERIENCE

 

Important events in world power systems operation and development from February to March 2017.

“SO UPS”, JSC

 

Operation and maintenance problems in Great Britain electrical grid

Elpidiforov V.Yu.

 

 

JOURNEY THROUGH THE PAST

 

USSR power engineering development within the context of war time

Gvozdetskiy V.L.