Transformer is one of the things which are the most important in transformer substation facilities apparatus, and the maintenance is important.
It can detect the damage and abnormality of transformer early by carrying out daily life or periodical maintenance, check and driving monitoring, but is useful for improvement in reliability of power supply by updating at time when it is more appropriate about accessories.

■Role of transformer accessories

1. We deal before developing into big accident disorder and prevent you from affecting power supply.
2. We minimize the damage of transformer and facilitate restoration.

Generally update time of the transformer body was 20-30 years and improved reliability of transformer even more and gathered up as our suggestion economically from maintenance, the check top about update recommendation time of accessories thought to be advantage.
(person wanting detailed material, please refer to Japan Electrical Manufacturers' Association technical data JEM-TR197)

Exchange recommendation time table of parts attached to transformer
Importance rank	Accessories name	Update Recommendation time	Exchange The days	Of blackout Necessity or not
A-1 When it detects abnormality of the body early, and trouble occurs, influence greatly extends to the body performance	Oil thermometer	Ten years	1st	The pivot
	Pressure discharge device	Ten years	1st	The pivot
	Internal trouble detector (pitorire, buffuhorutsurire, shock pressure relay)	Ten years	1st	The pivot
A-2 When trouble occurs, influence greatly extends to the body performance	Bushing	15 years	2nd	The pivot
	Refrigerator (own cold expression radiator, water-cooled expression air conditioner, yunittoku-ra)	15 years	3-5 days	The pivot
	Supplying oil pump	15 years	2nd	The pivot
	Cooling fan	15 years	1st	The pivot
B Even if trouble occurs, there is relatively little influence of the body	Dial oil gauge	15 years	2nd	The pivot
	Gas detection relay	15 years	1st	The pivot
	Oil style direction indicator	15 years	1st	The pivot
	Meter to connect	15 years	2nd	The pivot
	Rubber film for konsabeta	15 years	1st	The pivot
	Moisture absorption respiratory organs	15 years	2nd	No
	Valves	15 years	4th	The pivot
	Differential pressure, running water, leak relay (only as for the water-cooled expression air conditioner)	15 years	1-2 days	Only as for the running water, it is the pivot
C Main parts of accessories	Bearing (no refueling form)	Three years	1st	The pivot
	Bearing (refueling form)	Ten years	1st	The pivot
	Gasket (nitrile rubber)	15 years	Use place ・We stop at point	The pivot
	Gasket (cork synthetic rubber)	Ten years		The pivot

We maintain including transformer made in other companies from supervoltage transformer to dry process small capacity transformer as manufacturer specialized in transformer.

As transformer is 97% or more of high efficiency apparatuses, we are apt to ignore loss, but consumption loss (electricity loss) occurs because it is facilities apparatus which always runs unlike motors such as load apparatuses.

Our company develops low loss form transformer that planned electricity loss reduction and suggests total cost reduction by replacing with existing article.

■Loss of transformer

[no load loss]
Loss (it is loss of firm resolution and is also known as iron loss) to occur in excitation (applying) state to quantity of load irrelatively
[load loss]
Loss (also known as copper loss) to depend on electric current (load) which is mainly called off to winding

■It is way of thinking to becoming purpose of use of transformer and low loss

[when used as daytime factory load]
We recommend that we reduce loss in night light load.
We reduce no load loss including kokoritsu*sokoban and amorphous firm resolution transformer in conventional 30-70%.
[when we use to the full regardless of the night and day]
We recommend general efficiency form transformer that raised efficiency in high load band.
We mainly reduce one-day total loss by reducing winding loss (copper loss).

Our company plans 10% or more of loss decreases of that of the conventional company products by transformer having 80% or more of mean load factor.

■Calculation method of consumption loss

Loss (W) = no load loss (Wi) +k X k X load loss (Wc) of transformer
k: Transformer load factor (load factor (%)/100)
In the case of the following factory load pattern, electricity consumption loss of transformer per day becomes next.
No load loss = 24 X Wi
Load loss = 0.8 X 0.8 X Wc X 9+0.15 X 0.15 X Wc X 15

Is disadvantageous, and, as for our low loss form transformer, load is disadvantageous no load more than 20% (30% of standard values); of 10% or more (15% of standard values) fall low.

Amorphous transformer is transformer of energy-saving form that about 1/4 can reduce no load loss conventionally in comparison with nokei sokobanhenoshiki by using amorphous alloy as firm resolution materials. It is low loss than amorphous alloy hakei sokoban, but on the other hand invites upsizing and high material cost because saturated magnetic induction and fortune-telling moment are low. In addition, it becomes higher, and processing cost becomes higher-cost than Kay sokobanhenoshiki as the hardness is fragile highly.

Amorphous transformer/kei sokobanhenoshikishogenhikaku (transformer 20kVA with 6kV single phase oil)
	Amorphous transformer	kei sokobanhenoshiki
Dimensions W X D X H (mm)	590 X 560 X 755	565 X 535 X 785
Weight (kg)	174	142
No load loss (W)	17	60
Minus number loss (W)	305	305