Section 11 in Rajasthan Electricity Regulatory Commission (Metering) Regulations 2007
11. Metering System Requirement.
(1)Interface Meters: -(a)Meter location:(i)For Open access consumers, main & check meters shall be installed at delivery point or relevant to termination point of service line at outgoing isolator of licensee's sub station. The standby meter shall be installed at other end of line. This is applicable to open access interface meters having inter connection with transmission system/distribution system.(ii)For Mini Hydel stations, main and check meters shall be provided at energy transfer points, preferably at the generating station out going feeders.(b)Communication:(i)Metering equipment shall have external / internal modem for remote transmission of the data available in the meter memory through any one or more of the communication links such as Radio frequency, PLCC (Power Line Carrier Communication), PSTN (Public Switched Telephone Network), VSAT,OFC(Optical fiber cable), Mobile or any other means of tele-metering like private network of licensee or low power radio.(ii)The meter shall be capable of data transmission to Data concentrator/ Intelligent Electronic Device (IED). Application Programming Interface (API) and output file format shall be provided to the owner by the supplier, to enable data retrieval and interoperability of meters of different makes. Any additional specific requirement of the owner in this respect, shall be fulfilled by the supplier.(c)Time synchronization. - The time synchronization in the meters shall be from base computer (BC) through communication system and modem. The BC shall be equipped with GPS signal receiver for time synchronization of the meters connected through relevant communication system and modem. As a standby measure, the CMRI will be used for time synchronization of the individual meter. There shall also be a provision in the BC to synchronize with preset time delay with the GPS clock of SLDC or CDCS.(2)Consumer meter.(a)Location: Consumer meters shall be provided as per provisions of Supply Code. Meters shall generally be installed inside the consumer's premises near the main/working entrance where sufficient space for meter box (for LT consumers up to 50 kVA connected load) or a suitable lockable enclosure for HT consumer is reserved by the consumer. The meters shall be installed at proper place, height and in shade to prevent damage to the meter by rainwater etc.(b)Metering cabinet (Box).(i)Meters for LT consumers shall be housed in the meter-box and for HT consumers in metering cabinet provided/ approved by the licensee.(ii)No fuse will be provided inside the meter box in order to keep the meters and CTs free from the external tampering. The meter box shall be opened only in the presence of the authorized Engineer of the licensee. Fuses may be in series with line isolator for HT supply, where considered necessary from protection point of view.(iii)The iron clad switch or MCB/MCCB shall be provided with the meter and connected after the meter.(iv)All terminals shall be made by lugs and crimping.(v)For 11kV HT consumers arrangement of meter cabinet/box which houses CT/PT units and metering equipment inside, shall be installed at consumer's premises in a room exclusively meant for the purpose. The connections from licensee's line and the consumer's premises shall be through 11kV Cables.(vi)For supply at 33kV, the CT-PT set shall be outdoor type panel mounted / double pole structure mounted and the connections from licensee's line to consumer's premises if so required shall be through 33kV cables.(vii)Standard wiring diagrams for LT and HT metering, as prescribed by the distribution licensee/STU and approved by the metering committee, shall only be used.(viii)Secondary wires connections shall be through armoured cable to the meter cabinet in case of HT consumers on 33kV or 11kV, having outdoor CTs and PTs or CT-PT set, .The cable shall be laid in G.I. pipe/flexible conduit pipe and not embedded in the ground.(ix)Cable entry into the marshalling box of the instrument transformers as also the meter box/control panel shall be through glands and check nuts, which may further be sealed with epoxy compound.(x)Tight fitting PVC sleeves, Raychem or any other equivalent make, press &heat shrinkable type epoxy sleeves, shall be applied for at least 1.5 meter on connections/jumpers from out door instrument transformers bushing terminals.(xi)Meters shall be kept as near to the instrument transformers as possible.(xii)HT metering unit including instrument transformer, shall be mounted on double pole/ housed in H.T. cubicle so that licensee's officers can approach the location without assistance of the HT consumers.
