The First Digital Substation in the Moscow Region

Page 1

The MAIN JOURNAL for POWER GRID SPECIALISTS in RUSSIA

3 - 6 J U N E 2 0 1 9

MADRID, SPAIN

The MAIN JOURNAL for POWER GRID SPECIALISTS in RUSSIA

3 - 6 J U N E 2 0 1 9

MADRID, SPAIN

Page 2

smart grid

e First

Digital Substation

in the Moscow Region

OVERALL DESIGN SOLUTIONS REGARDING TO SUBSTATION

PRIMARY EQUIPMENT AND ITS MONITORING SYSTEMS

110 kV SF6 gas insulated switchgear

(GIS) of the substation is performed us-

ing "two main busbars" scheme. It is de-

signed for connecting four transmission

lines, two transformers and a busbar

coupler. 110 kV SF6 GIS produced by

"VO "Elektroapparat" JSC is equipped

with advanced monitoring system, in-

cluding:

– partial discharge monitoring system

(designed for monitoring 110 kV GIS

insulation condition and determining

defect type and location through

embedded expert system);

– system for monitoring circuit break-

ers condition (designed to calculate

mechanical wear of circuit breakers

and commutation life of the contact

elements);

– monitoring system of feeders current

and buses voltage as well as moni-

toring switching devices position and

condition.

Two 80 MVA power transformers

manufactured by "Togliatti Transform-

er", LLC are equipped with monitoring

system including the following:

– monitoring system of critical dissipa-

tion (control of transformer oil level);

– online monitoring of high-voltage

bushings;

– control of transformer windings cur-

rent and OLTC position (OLTC —

on-load tap changing);

– chromatic monitoring of the trans-

former oil condition (to ﬁ nd a defect

in transformer insulation initially and

to predict the technical condition).

110 kV GIS and transformers

monitoring system, controlling about

400 signals and measurements in to-

tal, is used for automatic assessment

of the substation equipment technical

condition, incipient failure detection

and prediction, forecasting and simu-

lating load capacitance and equipment

remaining life.

As a result, the system provides cut-

ting of operational costs for equipment

maintenance and repair, as well as

improving the eﬃ ciency of equipment

monitoring.

It is worth noting that low-resistance

neutral grounding of 20 kV power

transformer windings can signiﬁ cantly

increase the safety of personnel and

popu lation during one-phase short cir-

cuit in 20 kV distribution network.

OVERALL DESIGN SOLUTIONS REGARDING TO AUTOMATED

PROCESS CONTROL SYSTEM AND RELAY PROTECTION

AND AUTOMATION SYSTEM

The main unique feature of 110 kV "Med-

vedevskaya" digital substation is a mark-

edly diﬀ erent structure of automated pro-

cess control system and relay protection

and automation system in comparison

with traditional facilities.

Martikhin

.Y.,

Head of Relay Protection and Automation Department of Moscow

High-voltage Networks — branch of PJSC "MOESK"

Rybin I.S.,

Deputy Head of Relay Protection and Automation Department of Moscow

High-voltage Networks — branch of PJSC "MOESK"

Guriev

.V.,

Chief Project Engineer of EKRA Research and Production Enterprise Ltd.

In May 2018 the 110 kV "Medvedevskaya" substation was brought
into operation in Moscow High-voltage Networks (a branch of
PJSC “MOESK”). It is the

ﬁ

rst digital substation in the Moscow

region. This paper presents its key features and differences from
substations where traditional technologies are applied.

Page 3

The function of relay protection

and automation equipment is per-

formed by BE2502 and BE2704

microprocessing terminals manu-

factured by EKRA Research and

Production Enterprise Ltd. Data ac-

quisition and transmission system

of the substation is made in accor-

dance with IEC 61850 requirements

and is divided into three subsystems

(in fact, local area networks formed

by routers and communication optic

ﬁ ber cables).

Analog data transmission from

the primary measuring equipment

(voltage and current transformers)

is performed through the "process

bus" in accordance with IEC 61850-

9.2LE (Figure 1).

Current and voltage magnitudes

measured by traditional electromag-

netic voltage and current transform-

ers are digitized by interface devices

and transmitted as Sampled Values

signals to the "process bus". Any re-

lay protection and automation equip-

ment can obtain these measuring

data when required.

Digital signals between relay

protection and automation devices

(Figure 2), as well as signals from

relay protection devices to switching

devices are transmitted via the "data

bus" in GOOSE (Generic Object Ori-

ented Substation Events) message

format. These signals can be also

received and processed by any de-

vice capable to read them.

Finally, signals intended for au-

tomated process control system

AMU1

ТА1

ТА2

AMU2

Process bus (IEC 61850-9.2LE)

Main
protection

Back-up
protection

Circuit
breaker fail
protection

Differential
busbar
protection

DMU1

110 kV

circuit

breaker

DMU2

Substation busbar (IEC 61850-8.1)

Main
protection

Back-up
protection

Circuit
breaker fail
protection

Differential
busbar
protection

Fug. 2. Substation busbar
with data transmission according
to IEC 61850-8.1

Fug. 1. "Process bus" with
data transmission according
to IEC 61850-9.2LE

operation and its connection with

relay protection and automation

system are transmitted through

a special data bus in the MMS

format (Manufacturing Message

Speciﬁ cation).

Time server is used for ensur-

ing coordinated functioning of data

buses based on PRP. Time synchro-

nization is performed via the PTPv2

protocol. Separate package of emer-

gency events registration is used for

The 25th CIRED Session
Special issue, June 2019

Page 4

digital signals registration and moni-

toring (SV, GOOSE, MMS). Thus, the

concept of using technological infor-

mation exchange protocols in accor-

dance with IEC 61850 (Figure 3) is

fully implemented in 110 kV "Medve-

devskaya" substation.

As we can see, the fundamental

structural diﬀ erence of such a net-

work is the connection between de-

vices via data buses instead of Peer-

to-Peer connection.

Moreover, the full signal separa-

tion of relay protection and automa-

tion system and automated process

control system has been applied.

This decision was made taking into

account the current organization

structure of operating company and

segregation of responsibility zones

of relay protection and automation

department and automated process

control system department. Besides,

the decision concerning full signal

separation provides an unobvious

advantage: relay circuits are all-

insulated from external information

networks. In this regard, special in-

formation security issues and special

hardware and software data security

of substation key elements were not

required during substation design

and commis sioning.

The functions of relay protection

and automation system are totally

traditional. The selection of protec-

tion functions is executed based on

PJSC "MOESK" requirements. The

implementation of relay protection

based on digital local computer net-

works has little in common with the

usual way of relay protection op-

eration (with a big number of copper

connections).

The automated process control

system of the substation (Figure 4)

is executed based on the EVICON

software and hardware. Herewith,

automated process control system

and automatic remote control are in-

extricably linked. These subsystems

are usually separated in the tradi-

tional substations. Single test and

self-diagnostics system of EVICON

software and hardware as well as

communication hubs and communi-

cations links (commutation switches

and optical ﬁ ber communication

lines) provide reliable equipment op-

eration. This approach allowed engi-

neers to cut substantially the costs

of equipment used for collecting

and processing of primary analog

and digital signals. At the same time

separated servers of automated pro-

cess control system and automatic

remote control eliminate the risk (at

failure) of losing substation observ-

ability and controllability.

The automated process control

system and automatic remote control

in "Medvedevskaya" substation are

designed to complete the following

tasks:

– maintenance of online database

related to operation modes and

condition of substation equip-

ment;

– visualization and control of cur-

rent mode parameters (key single

line diagram, condition of substa-

tion electric equipment);

– execution of prealarm and alarm

system functions;

– remote and local control of prima-

ry equipment (power transform-

ers, switching devices, etc.);

– data reporting to the operations

control centers of the Moscow

Regional Dispatching Oﬃ ce,

network control center of MOESK

and Moscow High-voltage Net-

works through standard protocols

(IEC 60870-5-104);

– data backup and information stor-

age;

– ensuring information security of

automated process control sys-

tem;

– preparation of reporting docu-

ments.

DIGITAL SUBSTATION

PROJECT ADVANTAGES

Afore-mentioned principles of relay

protection operation in the substa-

tion have the following advantages:

1. Cutting the costs for equipment

maintenance due to advanced

diagnostics and monitoring sys-

tem of primary equipment, au-

tomated process control system

equipment and relay protection

and automation equipment.

Fig. 3. Data exchange network of 110 kV "Medvedevskaya" digital substation

20 kV

RPA

Dispatching control

Substation technological systems

Process bus

(IEC 61850-9.2LE)

Relay

protection and

automation

Relay

protection and

automation

Substation busbar

no. 1 GOOSE

(IEC 61850-8.1)

Substation busbar

no. 2 MMS

(IEC 61850-8.1)

Automated

control system

ACS + ARC

***

RPA

EER

Time

Server

AMU

DMU

SMART GR

*RPA – Relay Protection and Automation
**EER – Emergency Events Recorder
***ARC – Automatic Remote Control

Page 5

2. Ongoing monitoring of commu-

nication links between devices.

Optical links condition is con-

stantly monitored, as opposed to

copper wires.

3. Traditional current and voltage

transformers are used as prima-

ry measuring equipment. They

have considerably less cost, than

digital measuring equipment (op-

tical current transformers, Hall

transducers, etc.)

4. Considerable current decrease

of current transformer secondary

windings.

5. Ensuring full reservation of com-

munication links between relay

protection and automation de-

vices. Each subsystem (or data

bus) is executed as two exactly

alike networks A and B. These

subsystems and applied soft-

ware-based methods provide

PRP reservation (parallel reser-

vation). At failure of any network

element the operation continues

through operable network with-

out loss of system availability in

general and in certain areas.

6. Relay protection and automation

system ﬂ exibility. In the digital

substation, transforming links

between devices require only

change of network software con-

ﬁ guration, unlike traditional sub-

stations where implementation

of new relay protection and auto-

mation functions requires laying

of new cable links.

7. Integration into the system of

diﬀ erent-type equipment from

various manufacturers without

intermediate converters and

gateway software provides the

guaranteed data delivery and

fast response of the system.

8. No need in extensive repair of

cable communication lines. Dam-

aged cables search and their re-

placement are required only in

traditional substations (not digital

substations).

In the framework of regulatory

changes and the subsequent digi-

talization of power industry, digital

substation will provide other advan-

tages:

– remote change of devices setup

and conﬁ guration to cut the costs

for substation maintenance;

– more ﬂ exibility regarding func-

tions and algorithms of relay

protection and automation sys-

tem; application of functions and

algorithms which implementa-

tion is impossible in traditional

substations;

– proceeding to "condition-based"

maintenance (to cut the main-

tenance costs and to improve

relay protection and automation

system reliability);

– improved algorithms of relay

protection and automation

functions reservation (use of

standard designs for new con-

structed and reconstructed sub-

stations).

RPA

EER

Operating DC

voltage system

0.4 kV

auxiliaries board

APCS Server

Communication equipment

Power

quality

indexes

Engineering

systems

Substation busbar

no. 2

"Medvedevskaya"

substation

WKS

SF-6 GIS

Moscow High-voltage Networks

dispatching point

MOESK dispatching point

SO UPS dispatching point

Fig. 4. Block schematic diagram of automated process control system hardware and software

20 kV switchgear

The 25th CIRED Session
Special issue, June 2019

Оригинал статьи: The First Digital Substation in the Moscow Region

Читать онлайн

In May 2018 the 110 kV “Medvedevskaya” substation was brought into operation in Moscow High-voltage Networks (a branch of PJSC “MOESK”). It is the fi rst digital substation in the Moscow region. This paper presents its key features and differences from substations where traditional technologies are applied.