Alarm event records

Each event is stored using two records:

A "primary" record, which is created when the insulation alarm or transformer alarm occurs. This contains the insulation value, transformer load, or status of the transformer temperature sensor.
A "secondary" record, which is created when the insulation alarm or transformer alarm disappears. This contains the type of event (acknowledged insulation alarm, disappearance of overload or overheating event).

The 2 records are not logged consecutively. For example, transformer alarm can occur during an insulation fault.

Description of an Event Record in the Log

Register	Unit	Type	Range	Description
Word 1	–	Uint16	1...65535	Event record number
Word 2 Word 3 Word 4 Word 5	–	Uint64	–	Time tagging of event (using the same code as for the product date/time)
Word 6 Word 7	–	Uint32	0….1 0x40, 0x20 1020...1021, 1032...1033, 1034, 1110	Record identifier: Word 6, most significant byte: information for primary/secondary record. This field takes the value 1 for the primary record and value 0 for the secondary record. Word 6, least significant byte: type of data stored in the Value field. Word 7: address of the Modbus register that is the source of the data in the Value field.
Word 8 Word 9 Word 10 Word 11	–	Uint64	–	Depending on the type of record (primary or secondary): Primary record (when the event occurs): Insulation resistance value (in Ohm) when the event occurred (coded in Float32 in the last 2 registers). Transformer load (as a % of the nominal load encoded in Uint32 in the last 2 registers) Status of bimetal strip (encoded in Uint16 in the last register) Secondary record (when the event disappears or is acknowledged) — Type of insulation or transformer alarm (encoded in Uint16 on the last register)
Word 12	–	Uint16	1...65534	Primary/secondary record identifier for the event: In the case of a primary record for an event, this identifier is an odd integer; numbering starts at 1 and the number is incremented by 2 for each new event. In the case of a secondary record for an event, this identifier is equal to the primary record identifier plus 1.

Example of an event

The next 2 records relate to an example insulation alarm that occurred on October 1, 2010 at 12:00 pm and was acknowledged at 12:29 pm.

Record number: 1

Address		Register		Unit	Type	Value	Description
dec	hex	dec	hex	Unit	Type	Value	Description
20002	4E22	20003	4E23	–	Uint16	1	Record number
20003	4E23	20004	4E24	–	Uint64	10 0 10 1 12 0 0	Date when insulation alarm occurred (October 1, 2010, 12:00 pm)
20007	4E27	20008	4E28	–	Uint32	1 0x40 1020	Record identifier: Primary record plus secondary record Float32 value (insulation resistance) Value of register 1020 (register for insulation resistance monitoring)
20009	4E29	20010	4E2A	Ohm	Uint64	10000	Insulation resistance value at the time of the insulation alarm
20013	4E2D	20014	4E2E	–	Uint16	1	Secondary record identifier for the event

Record number: 2

Address		Register		Unit	Type	Value	Description
dec	hex	dec	hex	Unit	Type	Value	Description
20014	4E2E	20015	4E2F	–	Uint16	2	Record number
20015	4E2F	20016	4E30	–	Uint64	10 0 10 1 12 29 0	Date when insulation alarm acknowledged (October 1, 2010, 12:29 pm)
20019	4E33	20020	4E34	–	Uint32	1 0x20 1110	Record identifier: Secondary record Uint32 value (alarm acknowledged) 1110 register value ( product status register).
20021	4E35	20022	4E36	–	Uint64	8	Value of insulation alarm register at the time of insulation alarm acknowledgement
20025	4E39	20026	4E3A	–	Uint16	2	Secondary record identifier for the event