ER 11 - Standard Connection Arrangements DoE comment 11 Standard Connection Arrangeme… · f...
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[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 1 of 18
Engineering Recommendation No. 11 of the Electricity Distribution Code
Standard Connection Arrangements
Version 1.1
09 July 19
Prepared by:
Al Ain Distribution Company, Abu Dhabi Distribution Company,
Approved by:
Department of Energy
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 2 of 18
CONTENTS
1.0 DESIGN PRINCIPLES ............................................................................................... 3
Introduction ........................................................................................................ 3
Summary of design principles ............................................................................ 3
2.0 STANDARD CONNECTION ARRANGEMENTS ....................................................... 5
Introduction ........................................................................................................ 5
Category A1 - Connections at 400V from LV network or HV/LV substation not
located at the User premises ............................................................................. 5
Category A2 - Connections at 400V from HV/LV substation(s) located
at the User premises .......................................................................................... 6
Category B - Connections at 11kV ..................................................................... 7
Category C - Connections at 22kV ..................................................................... 9
Category D - Connections at 33kV ................................................................... 10
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 3 of 18
1.0 DESIGN PRINCIPLES
Introduction
1.1 The DISCO shall be responsible for the detailed design, engineering and agreement
by the User of all connections where User Systems are connected to the DISCO
Distribution System. The detailed design and engineering shall consider the User
System contribution to fault current, voltage drop and effects on power quality as well
as ensure compliance with the requirements of the Electricity Supply Regulations
and the Electricity Distribution Code.
1.2 This Engineering Recommendation provides standard connection arrangements for
the connection of User Systems to the DISCO Distribution System. The standard
connection arrangements are relevant to connections at 400V, 11kV, 22kV and 33kV
and for User Systems involving Generator Units and/or Distribution Systems
and/or Equipment connecting Generator Units or Distribution Systems. In addition,
it provides typical LV connections of small-scale Solar PV installation in the User
premises in accordance with The Electricity Wiring Regulations (Third Edition), March
2014 as amended.
1.3 For all Embedded Generator connections, refer to Engineering Recommendation No.3
– Connection of Embedded Generating Plant up to and including 30MW.
Summary of design principles
1.4 The standard connection arrangements for connections of User Systems to the
DISCO Distribution System are based on the following design principles:
(a) to meet the requirements of the Distribution Planning and Connection Code
(DPCC) ;
(b) to meet the requirements of Engineering Recommendation No.4 - Security of
Supply Standard for the Electricity Distribution System ;
(c) to provide for an easily defined and operationally practical Ownership
Boundary i.e. at bolted connection locations of User cables on to DISCO
switchgear ;
(d) to provide DISCO owned and operated interface switchgear at the User
premises that enables integration with the DISCO distribution management
system and disconnection through switching by the DISCO of the User
System;
(e) to facilitate the remote disconnection by the DISCO of each metered Customer
initiated by command via the associated tariff meter ;
(f) DISCO standard assets to be used whereby the design of the connection uses
standard components rated to achieve the required capacity ;
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 4 of 18
(g) on-going costs for operation, maintenance and repair of DISCO connection
assets to be borne by the DISCO ;
(h) land and buildings (for DISCO connection assets) at User premises to be
funded, provided and maintained by the User with full access rights granted to
the DISCO.
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 5 of 18
2.0 STANDARD CONNECTION ARRANGEMENTS
Introduction
2.1 There are five categories of standard connection arrangements.
(a) Category A1 - Connections at 400V from LV network or HV/LV substation not
located at the User premises.
(b) Category A2 - Connections at 400V from HV/LV substation(s) located at the
User premises.
(c) Category B - Connections at 11kV.
(d) Category C - Connections at 22kV.
(e) Category D - Connections at 33kV.
2.2 Under special circumstances non-standard connections arrangements may be
adopted subject to special Connection Agreement conditions and the specific
approval of the DISCO Technical Committee.
Category A1 - Connections at 400V from LV network or HV/LV substation not located at the User premises
2.3 Category A1 connections are applicable where the DISCO existing or intended
distribution architecture for the development area can accommodate a Category A1
connection of the capacity required. Should this not be the case then a Category A2
connection shall be applicable.
2.4 The various connection arrangements within Category A1 are shown in Figure 2.1.
2.5 These connections involve DISCO LV cable laid underground from a fuse way of a
DISCO feeder pillar (or service turret) or from a fuse way or moulded case circuit
breaker (MCCB) of a DISCO HV/LV substation not located at the User Premises.
2.6 The DISCO LV service cable will terminate at the LV incomer circuit breaker(s) of the
User main distribution board(s) at the User premises located either in a dedicated
room at the User premises (for premises with multiple Users and single User with
multiple feeders for distribution within the same premises) OR wall mounted panel with
the LV Incomer and meters (with / without CTs) for single User premises subject to
the DISCO acquiring “Control Authority” of the LV incomer circuit breaker(s) and of the
outgoing circuit breaker(s) for User connections i.e. the User cannot operate the LV
** Disco Control authority : is the authority of providing the approval on the point of isolation by Disco’s to users for any means of
operations and Disco’s shall confirm the safety locks and proper earthing been applied by users in both ends ( isolation points) as
per Disco’s System safety rules, using RISSP as a control measure.
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 6 of 18
incomer circuit breaker(s) without first obtaining approval from the DISCO. Such
Control Authority ** arrangement shall be formalised in a Connection Agreement and
would require the User appointed electrical contractor or facilities manager to liaise
with the DISCO before any operation on the LV incomer circuit breaker(s) or outgoing
circuit breaker(s) is carried out in case of multiple User sites and the provision of
access to the DISCO. In case of Single User sites the LV Incomer may be operated
by DISCO or the User’s representative under the supervision of DISCO for isolation
purpose.
The User main distribution board(s) may be wall mounted or back to wall in order to
conserve space.
2.7 The User main Distribution boards(s) shall be of type tested design, metal enclosed,
approved by the DISCO and shall include where applicable:
(a) A Moulded case circuit breaker (MCCB) for the incomer User feeder.
(b) An outgoing moulded case circuit breaker (MCCB) for each User feeder.
(c) Metering current transformers (CTs) for each User.
(d) Current and fused voltage metering circuits.
(e) Tariff meter for each User feeder.
(f) Control circuitry for tripping and lockout of each MCCB by command from the
associated tariff meter.
(g) Facilities for locking and sealing to prevent tampering of the metering circuitry
and meter connections.
(h) For small-scale solar PV installations, an additional meter dedicated to
monitoring the amount of electricity generation1 and a switch disconnector2.
Category A2 - Connections at 400V from HV/LV substation(s) located at the User premises
2.8 Category A2 connections are applicable where the DISCO existing or intended
distribution architecture for the development area includes for 11kV or 22kV feeders
and where the connection capacity cannot be accommodated by a Category A1
connection.
2.9 The various connection arrangements within Category A2 are shown in Figure 2.2 for
single Customer premises and Figures 2.3 for multiple Customers premises.
2.10 If determined by the DISCO, multiple Category A2 connections shall be provided at
the User premises as required to meet the demand or contingency associated with the
1 Small-Scale Solar Photovoltaic Energy Netting Regulations (First Edition), January 2017 as amended 2 The Electricity Wiring Regulations (Third Edition), March 2014 as amended
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 7 of 18
User System. For example larger high rise buildings and commercial / retail
complexes may require numerous Category A2 connections.
2.11 These connections involve multiple DISCO LV cables laid on trays, in ducts or in cable
troughs from the transformer(s) of DISCO HV/LV substation(s). The DISCO HV/LV
substation(s) as required shall be constructed within the User premises.
2.12 The DISCO LV cables will terminate at the LV incomer circuit breaker(s) of the User
main distribution board(s) located in a dedicated room(s) at the User premises subject
to the DISCO acquiring “Control Authority” of the LV incomer circuit breaker(s), i.e. the
User cannot operate the LV incomer circuit breaker(s) without first obtaining approval
from the DISCO. Such Control Authority arrangement shall be formalised in a
Connection Agreement and would require the User appointed electrical contractor
or facilities manager to liaise with the DISCO before any operation on the LV incomer
circuit breaker(s) is carried out and the provision of access to the DISCO.
2.13 The User main distribution board(s) shall be of type design tested, metal enclosed,
approved by the DISCO and shall include:
(a) An air circuit breaker (ACB) or moulded case circuit breaker (MCCB) for the
incomer User feeder.
(b) Control circuitry for tripping and lockout of the incomer ACB or MCCB by
command from the associated DISCO tariff meter.
(c) For small-scale solar PV installations, an additional meter dedicated to
monitoring the amount of electricity generation and a switch disconnector.
Category B - Connections at 11kV
2.14 2.15 Category B connections are applicable for User Systems that include 11kV
loads or HV generation and where the DISCO existing or intended distribution
architecture for the development area caters for 11kV feeders.
2.15 The various connection arrangements within Category B are shown in Figure 2.4 to
Figure 2.6.
2.16 If determined by the DISCO multiple Category B connections shall be provided at the
User premises as required to meet the demand, generation capacity or contingency
associated with the User System. For example district cooling plants, pumping
stations, factories and larger than 6MVA generation plants may require numerous
Category B connections.
2.17 The DISCO shall determine the number of Category B connections provided at the
User premises giving due consideration to Engineering Recommendation No.4 -
Security of Supply Standard for the Electricity Distribution System and to the
configuration of the primary substations (quantity and rating of transformers) existing
and intended for the development area.
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 8 of 18
2.18 Category B connections involve a number of DISCO 11kV cables laid underground
from circuit breakers at DISCO primary substation(s) or from DISCO ring main HV/LV
substations.
2.19 In order of preference, the following DISCO/User interface arrangements shall apply;
subject to mutual agreement between both DISCO and User:
(a) Each of the DISCO 11kV cables shall terminate at separate DISCO interface
switchgear located at the User premises. The separate DISCO interface
switchgear shall be located in a dedicated single room or in dedicated separate
rooms at different locations with direct access for DISCO authorised staff. (or)
(b) Each of the DISCO 11kV cables shall terminate at the 11kV incomer circuit
breaker(s) of the User HV switchgear panel(s) located in a dedicated room(s)
at the User premises subject to the DISCO acquiring “Control Authority” of the
11kV incomer circuit breaker(s), i.e. the User cannot operate the 11kV incomer
circuit breaker(s) without first obtaining approval from the DISCO. Such Control
Authority arrangement shall be formalised in a Connection Agreement and
would require the User HV authorised staff to liaise with the DISCO before any
operation on the 11kV incomer circuit breaker(s) is carried out and the provision
of access to the DISCO. Where access is restricted within the User premises,
then the above option would apply. Note that this arrangement is applicable for
dedicated 11kV connections only.
2.20 For connections above 3MVA to User Systems which are effectively single Customer
installations, the User System shall enable the transfer of load in the case of an outage
on any one of the DISCO incomer feeders. The User System shall meet the approval
of the DISCO in this regard.
2.21 The DISCO interface switchgear shall be of type tested design, metal enclosed,
approved by the DISCO and shall include:
(a) A load break / fault make switch or vacuum circuit breaker (VCB) for each
DISCO feeder.
(b) Isolation and earthing facility for each DISCO feeder.
(c) A VCB for each User feeder (from generation and to demand).
(d) Isolation and earthing facility for each User feeder (from generation and to
demand).
(e) Metering current transformers (CTs) and voltage transformer (VT) on each
User feeder (from generation and to demand).
(f) Current and fused voltage metering circuits.
(g) Tariff meters for each User feeder (from generation and to demand).
(h) Facilities for integration with the DISCO distribution management system.
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 9 of 18
(i) Control circuitry for tripping and lockout of the VCB of each User feeder by
command from the associated DISCO tariff meter.
(j) Facilities for locking and sealing to prevent tampering of the metering circuitry
and meter connections.
Category C - Connections at 22kV
2.22 Category C connections are applicable for User Systems that include 22kV loads or
HV generation and where the DISCO existing or intended distribution architecture for
the development area caters for 22kV feeders.
2.23 The various connection arrangements within Category B are shown in Figure 2.7 to
Figure 2.9.
2.24 If determined by the DISCO multiple Category C connections shall be provided at the
User premises as required to meet the demand, generation capacity or contingency
associated with the User System. For example, district cooling plants, pumping
stations, factories and larger than 12MVA generation plants may require numerous
Category C connections.
2.25 The DISCO shall determine the number of Category C connections provided at the
User premises giving due consideration to Engineering Recommendation No.4 -
Security of Supply Standard for the Electricity Distribution System and to the
configuration of the primary substations (quantity and rating of transformers) existing
and intended for the development area.
2.26 Category C connections involve a number of DISCO 22kV cables laid underground
from circuit breakers at DISCO primary substation(s) or from DISCO ring main HV/LV
substations.
2.27 In order of preference, the following DISCO/User interface arrangements shall apply;
subject to mutual agreement between both DISCO and User:
(a) Each of the DISCO 22kV cables shall terminate at separate DISCO interface
switchgear located at the User premises. The separate DISCO interface
switchgear shall be located in a dedicated single room or in dedicated separate
rooms at different locations with direct access for DISCO authorised staff.
(b) Each of the DISCO 22kV cables shall terminate at the 22kV incomer circuit
breaker(s) of the User HV switchgear panel(s) located in a dedicated room(s)
at the User premises subject to the DISCO acquiring “Control Authority” of the
22kV incomer circuit breaker(s), i.e. the User cannot operate the 22kV incomer
circuit breaker(s) without first obtaining approval from the DISCO. Such Control
Authority arrangement shall be formalised in a Connection Agreement and
would require the User HV authorised staff to liaise with the DISCO before any
operation on the 22kV incomer circuit breaker(s) is carried out and the provision
of access to the DISCO. Where access is restricted within the User premises,
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 10 of 18
than the above option would apply. Note that this arrangement is applicable for
dedicated 22kV connections only.
2.28 For connections above 3MVA to User Systems which are effectively single Customer
installations, the User System shall enable the transfer of load in the case of an outage
on any one of the DISCO incomer feeders. The User System shall meet the approval
of the DISCO in this regard.
2.29 The DISCO interface switchgear shall be of type tested design, metal enclosed,
approved by the DISCO and shall include:
(a) A load break / fault make switch or vacuum circuit breaker (VCB) for each
DISCO feeder.
(b) Isolation and earthing facility for each DISCO feeder.
(c) A VCB for each User feeder (from generation and to demand).
(d) Isolation and earthing facility for each User feeder (from generation and to
demand).
(e) Metering current transformers (CTs) and voltage transformer (VT) on each
User feeder (from generation and to demand).
(f) Current and fused voltage metering circuits.
(g) Tariff meters for each User feeder (from generation and to demand).
(h) Facilities for integration with the DISCO distribution management system.
(i) Control circuitry for tripping and lockout of the VCB of each User feeder by
command from the associated DISCO tariff meter.
(j) Facilities for locking and sealing to prevent tampering of the metering circuitry
and meter connections.
Category D - Connections at 33kV
2.30 Category D connections are applicable for User Systems that include HV loads or HV
generation and where the DISCO existing or intended distribution architecture for the
development area caters for 33kV feeders and where the connection capacity cannot
be accommodated by a Category B connection.
2.31 The various connection arrangements within Category D are shown in Figure 2.10 to
Figure 2.12.
2.32 If determined by the DISCO multiple Category D connections shall be provided at the
User premises as required to meet the demand, generation capacity or contingency
associated with the User System. For example, district cooling plants, pumping
stations, factories and larger than 18MVA generation plants may require numerous
Category D connections.
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 11 of 18
2.33 The DISCO shall determine the number of Category D connections provided at the
User premises giving due consideration to Engineering Recommendation No.4 -
Security of Supply Standard for the Electricity Distribution System and to the
configuration of the primary substations (quantity and rating of transformers) existing
and intended for the development area.
2.34 Category D connections involve a number of DISCO 33kV cables laid underground
from circuit breakers at grid stations or from DISCO 33kV network.
2.35 In order of preference, the following DISCO/User interface arrangements shall apply;
subject to mutual agreement between both DISCO and User:
(a) Each of the DISCO 33kV cables shall terminate at separate DISCO interface
switchgear located at the User premises. The separate DISCO interface
switchgear shall be located in a dedicated single room or in dedicated separate
rooms at different locations with direct access for DISCO authorised staff.
(b) Each of the DISCO 33kV cables shall terminate at the 33kV incomer circuit
breaker(s) of the User HV switchgear panel(s) located in a dedicated room(s)
at the User premises subject to the DISCO acquiring “Control Authority” of the
33kV incomer circuit breaker(s), i.e. the User cannot operate the 33kV incomer
circuit breaker(s) without first obtaining approval from the DISCO. Such Control
Authority arrangement shall be formalised in a Connection Agreement and
would require the User HV authorised staff to liaise with the DISCO before any
operation on the 33kV incomer circuit breaker(s) is carried out and the provision
of access to the DISCO. Where access is restricted within the User premises,
than the above option would apply. Note that this arrangement is applicable for
dedicated 33kV connections only.
2.36 For connections above 3MVA to User Systems which are effectively single Customer
installations, the User System shall enable the transfer of load in the case of an outage
on any one of the DISCO incomer feeders. The User System shall meet the approval
of the DISCO in this regard.
2.37 The DISCO interface switchgear shall be of type tested design, metal enclosed,
approved by the DISCO and shall include:
(a) A load break / fault make switch or vacuum circuit breaker (VCB) for each
DISCO feeder.
(b) Isolation and earthing facility for each DISCO feeder.
(c) A VCB for each User feeder (from generation and to demand).
(d) Isolation and earthing facility for each User feeder (from generation and to
demand).
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 12 of 18
(e) Metering current transformers (CTs) and voltage transformer (VT) for each
User feeder (from generation and to demand).
(f) Current and fused voltage metering circuits.
(g) Tariff meters for each User feeder (from generation and to demand).
(h) Facilities for integration with the DISCO distribution management system.
(i) Control circuitry for tripping and lockout of the VCB of each User feeder by
command from the associated DISCO tariff meter.
(j) Facilities for locking and sealing to prevent tampering of the metering circuitry
and meter connections.
Figure 2.1 : Category A1 - Connections at 400V from LV network or HV/LV substation not located at the User premises
400V
M
Userpremises
Solar PV Generation up to 250kVA
from LV network or
HV/LV substation
from LV network or
HV/LV substation
400V User premises
M
PVM
Solar PV Generationup to 250kVA
Customer demand up to 250kVA (Single Villa)
DISCO assetUser assettariff meterconnection pointcircuit breaker (with isolating capability)DISCO load break / fault make switch (alternatively circuit breaker ) or PV generation switch disconnector PV generation output monitoring meter
M
Customer 1 Customer 2 Customer 3 Customer n Customers demand
up to 250kVA(Multiple Villas in a single plot)
PVM
PVM
M M
DISCO Shall have “Control Authority” over LV incomer CB
M
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 13 of 18
Figure 2.2 : Category A2 - Connections at 400V from HV/LV substation(s) located at the User premises – Single Customer
Figure 2.3 : Category A2 - Connections at 400V from HV/LV substation(s) located at the User premises – Multiple Customers in one premises (User
interface switchgear)
DISCO assetUser assettariff meterconnection pointcircuit breakeroff load switchDISCO load break / fault make switch (alternatively circuit breaker) or PV generation switch disconnectorPV generation output monitoring meter
M
PVM
from HV network
400V
22kV or 11kV
Customer demandup to 1.5MVA
Userpremises
Solar PV Generationup to 1.5MVA
PVM
M
DISCO shall have “Control Authority” over LV incomer CB
User LV main distribution
board
User interface switchgear option
M
22kV or 11kV
M
Userpremises
chiller plant
services
400V
from HV network
MM
apartments
MM
apartments
Customers demand up to 1.5MVASolar PV Generation
up to 1.5MVA
PVMDISCO assetUser assettariff meterconnection pointcircuit breakerDISCO load break / fault make switch (alternatively circuit breaker) or PV generation switch disconnectorPV generation output monitoring meter
M
PVM
DISCO shall have “Control Authority” over LV incomer CB
User LV main distribution
board
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 14 of 18
Figure 2.4 : Category B - Connections at 11kV (DISCO interface switchgear)
Figure 2.5 : Category B - Connections at 11kV (User interface switchgear)
Max 1 of 6MVA from a 2 transformer 33/11kV substationMax 2 of 6MVA from a 3 transformer 33/11kV substationMax 3 of 6MVA from a 4 transformer 33/11kV substationMax 6 of 6MVA from a 4 transformer 132/11kV substation
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
fromHV networkor substation
Userpremises
M
Userpremises
from HV network
Customer installation shall enable transferof load between connection points A & B
A B
Customer demandup to 6MVA
Customer demandup to 3MVA
M M
Max 1 of 3MVA
11KV 11KV
Max 1 of 6MVA from a 2 transformer 33/11kV substationMax 2 of 6MVA from a 3 transformer 33/11kV substationMax 3 of 6MVA from a 4 transformer 33/11kV substationMax 6 of 6MVA from a 4 transformer 132/11kV substation
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
from HV networkor substation
(dedicated feeders only)
Userpremises
Customer installation shall enable transferof load between connection points A & B
A B
Customer demandup to 6MVA
M
11kVDISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
M
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 15 of 18
Figure 2.6 : Category B - Connections at 11kV (Embedded Generator)
Figure 2.7 : Category C - Connections at 22kV (DISCO interface switchgear)
Userpremises
M
from HV network
Customer installation shall enable transferof load between connection points A & B
Customer demandup to 12MVA
Customer demandup to 3MVA
Max 5 of 12MVA from a 4 transformer 132/22kV substation
fromHV networkor substation
Userpremises
A B
M M
Max 1 of 3MVA
22kV 22kV
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
M
Userpremises
fromHV network
Generation up to 6MVA
Userpremises
from HV network
or substation
Max 1 of 6MVA from a 2 transformer 33/11kV substationMax 2 of 6MVA from a 3 transformer 33/11kV substationMax 3 of 6MVA from a 4 transformer 33/11kV substationMax 6 of 6MVA from a 4 transformer 132/11kV substation
11kV 11kV
M
DISCO assetUser assettariff metertariff meter if required by ADWEC power purchase agreementconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
M
DISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
GCustomer demand
Refer to ER3 - Connection of Embedded Generating Plant up to and including
20MW
Max 1 of 6MVAon a ring circuit
Generation up to 6MVA
M
GCustomer demand
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 16 of 18
Figure 2.8 : Category C - Connections at 22kV (User interface switchgear)
Max 5 of 12MVA from a 4 transformer 132/22kV substation
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
from HV networkor substation
(dedicated feeders only)
Userpremises
Customer installation shall enable transferof load between connection points A & B
A B
Customer demandup to 12MVA
M
22kVDISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
M
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 17 of 18
Figure 2.9 : Category C - Connections at 22kV (Embedded Generator)
Figure 2.10 : Category D - Connections at 33kV (DISCO interface switchgear)
Userpremises
M
from HV network
Customer installation shall enable transferof load between connection points A & B
Customer demandup to 18MVA
Customer demandup to 3MVA
Max 4 of 18MVA from a 220/33kV substation
fromHV networkor substation
Userpremises
A B
M M
Max 1 of 3MVA
33kV 33kV
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
M
Userpremises
fromHV network
Generation up to 12MVA
Userpremises
from HV network
or substation
Max 5 of 12MVA from a 4 transformer 132/22kV substation
22kV 22kV
M
DISCO assetUser assettariff metertariff meter if required by ADWEC power purchase agreementconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
M
DISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
GCustomer demand
Refer to ER3 - Connection of Embedded Generating Plant up to and including
20MW
Max 1 of 12MVAon a ring circuit
Generation up to 12MVA
M
GCustomer demand
[Eng. Rec No.11 – Std. Conn. Arr. V 1.1] Page 18 of 18
Figure 2.11 : Category D - Connections at 33kV (User interface switchgear)
Figure 2.12 : Category D - Connections at 33kV (Embedded Generator)
Max 4 of 18MVA from a 220/33kV substation
DISCO assetUser assettariff meterconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
from HV networkor substation
(dedicated feeders only)
Userpremises
Customer installation shall enable transferof load between connection points A & B
A B
Customer demandup to 18MVA
M
33kVDISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
M
M
Userpremises
fromHV network
Generation up to 18MVA
Userpremises
from HV network
or substation
Max 4 of 18MVA from a 220/33kV substation
33kV 33kV
M
DISCO assetUser assettariff metertariff meter if required by ADWEC power purchase agreementconnection pointcircuit breakerload break / fault make switch (alternatively circuit breaker)
M
M
DISCO shall have “Control Authority” over HV incomer CB
User HV switchgear panel
GCustomer demand
Refer to ER3 - Connection of Embedded Generating Plant up to and including
20MW
Max 1 of 18MVAon a ring circuit
Generation up to 18MVA
M
GCustomer demand