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The Landis & Gyr Cashpower Power Rail Split Prepaid Meters are single-phase 60A (80A optional) split prepaid meters in a DIN rail-mount housing. Ideal for new reticulation where housing is informal and the prepayment meters are mounted in a pole-top enclosure with respective customer interface units conveniently mounted in the dwellings below.
Prepaid Meters Features
- Compact meter design with DIN rail-mount layout for high density stacking
- Easy to install
- Customer Interface Unit provides valuable information to help consumers effectively manage their electricity consumption
- Galvanically isolated communication link to customer interface unit for consumer safety
- Plug-in communications connector on the meter for easier utility access and maintenance
- Programmable operating mode – Energy Limiting Mode, Prepayment or Credit metering
- Programmable software power limit
- Programmable monthly allocation of energy (MAE)
- Commissioning and de-commissioning feature
- Significant Reverse Energy (SRE) detection
- Meter state indication LED and communication diagnostic LED at the meter
- High surge withstand capability for areas prone to lightning or other line surges
- High temperature withstand capability
- IEC 62052-11, IEC 62053-21 compliant
Full Description of this Prepaid Meter
The Cashpower Power-
Split meter concept
The Cashpower Power-
The Customer Interface Unit is a compact unit with a user-
The meter contains all critical metering, number decryption and load control functionality. It operates independently of the customer interface unit and is immune to any form of tampering on the customer interface.
The meter is usually installed in a secure, locked enclosure –
Principle of operation
The Cashpower Power-
Energy Limiting Mode
This mode allows utilities to distribute a fixed, monthly allocation of energy to consumers. It encourages the rational use of energy without severely inconveniencing the consumer. Operation is as follows:
Assume that a monthly energy allowance of 150kWh has been allocated to a consumer. The meter allocates this energy in regular, equal portions over the thirty-
Assuming that the consumer draws no power at all, the credit level will continue to increase. However, as soon as energy starts to be used the credit level is proportionately decremented. If the rate at which energy is being used is less than the rate at which it is being incremented, the credit level will slowly continue to increase. If the rate at which energy is being used is greater than the rate at which it is being incremented, the credit level will slowly decrease. It is in the consumer’s interest to ensure that electricity is not wasted and that unnecessary appliances are turned off. By conserving energy, it will be possible to use it at a high rate for periods when required.
In the event of the consumer exceeding the allocated allowance (credit level reduced to zero), the load is disconnected. However, the next allocation of credit will be available within a very short period of time (15 seconds) and the supply of electricity restored. Providing the consumer takes immediate steps to disconnect unnecessary appliances, it will be possible to have at least basic services available e.g. lighting. With a 150kWh monthly allocation of energy, it will be possible to maintain a continuous load of 200W whilst still maintaining a positive credit balance.
In Prepayment metering mode it functions as a normal prepayment meter. Credit tokens are purchased and entered into the meter via the customer interface unit keypad. On expiry of credit the load is disconnected and will only be re-
In Credit metering mode it functions as a conventional credit meter. Power is continuously supplied to the consumer and total kWh’s used is continuously measured and recorded. The meter must be read by the utility at regular intervals and the consumer billed accordingly.
Automatic / manual supply re-
A programmable function allows for either automatic or manual restoration of power to the load after it has been disconnected for a period due to expiry of credit or Power Limiting. Manual restoration is accomplished via the customer interface unit.
The meter is controlled via the customer interface unit in exactly the same way as other meters in the Cashpower meter range. User interaction with the meter and access to meter information e.g. rate of energy consumption, low credit warning and load contactor status, is available using the customer Interface’s keypad and large LCD. The customer interface unit makes use of clear, language-
Meter status and diagnostic indicators
The meter includes an LED status indicator. This allows a technician to view the state of the meter without the need for specialised interrogation tools or having to gain access to the consumer’s premises. Information such as Tamper status, Power Limiting, Commissioned/Decommissioned status and Remaining Credit status are available.
The meter also features a dedicated diagnostic LED for the Customer Interface. It can indicate the presence of “Open” or “Short” circuited communication lines. This is a valuable visual aid that assists the technician to validate the installation and determine probable fault types.
As a customer option, more detailed information and programming is achieved via the standard interrogation port on the side of the meter.
As a standard feature, the meter has an IEC 62056-
The split configuration of the meter significantly reduces the risk of tampering. The meter is installed in a remote, secure location and is mechanically sealed against tampering through the use mechanical clips and inaccessible assembly screws. Utility-
The meter also has a feature allowing detection of Significant Reverse Energy (SRE). If the line and load wires are swapped during installation, the meter will continue to operate and decrement credit. The unit may be factory programmed to Tamper and disconnect the consumer’s load should SRE be detected.
Disconnect on Power Fail
The meter includes a feature to cater for a condition where the neutral link to the device is removed. The meter can be personalised to disconnect the load if a power failure is detected, as would be the case if the neutral wire were to be removed.
The meter has been designed to have a surge voltage withstand that significantly exceeds the requirements of IEC 62052-11. Depending on the installation’s electrical environment, the customer has the option to fit an additional surge arrestor with a current surge rating in excess of 30kA.
The meter is suited for connection to most metering and reticulation systems. The communication wires for the customer interface are non-