CALISTO & MYRKOS FAQS

In some situations due to an incomplete installation of the software, the Windows driver of Calisto monitor is not properly installed and the communication between the software and Calisto monitor is not successful. In order to update the Calisto driver, the next procedure has to be followed:

• Install the latest version of Calisto Access on the laptop
• At the end of the installation exit Calisto Access
• Connect one end of the USB cable to the Calisto monitor and the second end to the laptop
• Explore Device Manager and verify the COM port assignation under Serial Ports (COM & LPT). One of the options should be “Morgan Schaffer Calisto x (COMyy)”, where x is the type of the Calisto (1, 2, 5 or 9) and YY represents the number assigned by Windows to this port.

Each series of Calisto monitor is equipped with serial and Ethernet communication ports. On these physical ports Morgan Schaffer developed industry standard communication protocols: Modbus, DNP3 and IEC61850.

Calisto C55/C65/C75:
The Databank represents a stack, a location in the memory of the Calisto were the embedded software saves the measurements and its internal parameters. The databank has a capacity of 3000 records. Calisto instruments calculate a validated reading every 3 hours which gives approximately 1 year of recordings (1 year and 10 days to be more precise). When databank is full, the oldest reading is pushed out and the new reading comes in (First-In-First-Out).

Calisto C500/C900:
The Databank represents a stack, a location in the memory of the Calisto were the embedded software saves the measurements and its internal parameters. Databank has a capacity of 18000 records. Depending on the measuring frequency, the databank can store between 2 and 6 years of information. When full, the oldest reading is pushed out and the new reading comes in (First-In-First-Out).
Storage capacity is listed below:
a. For unit set to have one reading every 3 hours (default)

• readings per = 8 readings
• readings per year ~ 3000 readings
• number of years to store the max of 18000 readings: 6 years

b. For unit set to have one reading every 2 hours

• readings per day = 12 readings
• readings per year ~ 4400 readings
• number of years to store the max of 18000 readings: 4 years

c. Every 1 hour

• readings per day: 24 readings
• readings per year ~ 8800 readings
• number of years to store the max of 18000 readings: 2 years

The valves selection is a very important step when we refer to the unit step response. These are the general considerations when selecting the valves on the transformer:

• Female, ball or gate type valves with a minimum diameter of ½ NPT are recommended for the transformer valves.
• The inlet and outlet valves must not be close to a pump.
• The oil RETURN line must not exceed 11 m (35 ft).
• The oil SUPPLY line must be longer than 1 m (3 ft) to reduce mechanical stress.
• The distance between the two transformer valves should be a minimum of 1 m (3 ft).
• The inlet valve should be at least 0.45 m (18 in.) above the main tank bottom.
• Do not make straight lines between the transformer tank and the monitor. Include one loop or bend in the oil line.
• In very hot conditions, it is strongly recommended not to insulate the oil lines.
• In very cold conditions, it is strongly recommended to permanently insulate the oil lines.
• Optional shutoff valves (preferably ball valves) are recommended below the monitor on the oil RETURN and SUPPLY lines to isolate the monitor if un-mounting is required.

The Calisto marked with a label that shows DC compatibility, can be feed with either AC or DC voltage. The main power connections (Connectors 1 and 2 also identified L and N) accepts any supply voltage from 100 to 240 VAC (60-50 Hz) or from 100 to 220 VDC.

All Calisto / Calisto 2 series, including DC version, show on the door’s display the validated readings. Validated readings are continuously zeroed to guarantee long-term stability and low level detection accuracy. This reading changes every three hours. A continuous reading of the hydrogen concentration is also performed, to indicate any variation of hydrogen concentration which may occur between validated readings. To inspect the continuous reading, we have to connect to the unit using a serial or USB cable and the dedicated software.

Calisto units feature by default the following communication ports: RS232 (five position connector), RS485 (five position connector), Ethernet (RJ45) and USB type B connector. To integrate Calisto readings to a substation working station or more advanced, a centralized location, we could use cellular, radio frequency or fiber optic modems. These devices could be connected to the Calisto either on the Ethernet port or the RS485 port. For radio frequency modems a site assessment needs to be performed prior to the installation. Additional details regarding the ports pinout could be found in the Operation and Installation manual of the Calisto units.

Yes, Morgan Schaffer provides a unique feature of swappability between Calisto 2 and Calisto5/ 9. To explain in details the concept, the following example is shown: if one transformer is equipped with a Calisto 2 instrument to monitor the hydrogen and moisture and after a certain period of time the substation maintenance team or SCADA personnel notice that there is a slow / fast increase in hydrogen, the team would be able to install a Calisto 9 to replace the Calisto unit. The advantage of swapping the Calisto 2 with a Calisto 9 is that the latest provides the readings of all fault gases, not just the key gases (hydrogen and carbon monoxide).

The Calisto units could be integrated to the substation or corporate network using the Ethernet (RJ45) port. This connection provides several advantages over other hardware type. One of the advantages is having multiple masters polling the unit on three different protocols: Modbus, DNP3 and MSSP (Morgan Schaffer Systems Protocol).

• The Modbus master can connect to Calisto (Modbus slave), using TCP/IP on port 502.
• The DNP3 master can connect to Calisto (DNP3 slave), using TCP/IP on port 20000.
• The MSSP master (Calisto Access or Calisto Manager) can connect to Calisto (MSSP slave), using UDP or TCP/IP on port 30.

The carrier gas cylinder contains high purity helium, with a purity of is 99.9999%. Calisto 5 and Calisto 9 monitors are designed to be permanently installed on critical power transformers for continuous measurement of gases dissolved in the dielectric insulating fluid. These monitors use a proprietary Morgan Schaffer gas chromatography technology optimized for online DGA. In order to provide accurate and precise results, these monitors use high purity helium carrier gas.

The carrier gas cylinder contains high purity helium, with a purity of is 99.9999%. Calisto 5 and Calisto 9 monitors are designed to be permanently installed on critical power transformers for continuous measurement of gases dissolved in the dielectric insulating fluid. These monitors use a proprietary Morgan Schaffer gas chromatography technology optimized for online DGA. In order to provide accurate and precise results, these monitors use high purity helium carrier gas.

When an alarm is triggered on an on-line monitor and this information is seen in Supervision and Control Center, Morgan Schaffer suggests:

• If the alarms is related to a gas, take an oil sample using a glass syringe (30cc or 50cc) from the Calisto sampling port and either send it to a reputable laboratory or run it through a portable Dissolved Gas Analyzer (like Myrkos portable instrument).
• Immediately take databank, the event log and diagnostic from the Calisto monitor using dedicated software – Calisto Access, Calisto Diagnostic or Calisto Manager and send it to Morgan Schaffer at [email protected]
• If the alarm is related to an internal error on the Calisto, take the diagnostic from the Calisto monitor using dedicated software – Calisto Diagnostic Tool or Calisto Manager and send it to [email protected] for validation.