REG - Mitsubishi Elect. - Statement re Improper Quality Control Practices

Mitsubishi ElectricAnnouncement

22/04/2022 08:00

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RNS Number : 0329J  Mitsubishi Electric Corporation  22 April 2022

 

 

 

 FOR IMMEDIATE RELEASE                                No. 3512

 Customer Inquiries                                   Media Inquiries
                                                      Takeyoshi Komatsu
 Marketing Department                                 Public Relations Division
 Transmission & Distribution Systems Center
 Energy & Industrial Systems Group
 Mitsubishi Electric Corporation                      Mitsubishi Electric Corporation
                                                      Tel: +81-3-3218-2346
 Keiden_Ako_Tr@ym.MitsubishiElectric.co.jp            prd.gnews@nk.MitsubishiElectric.co.jp
 (mailto:Keiden_Ako_Tr@ym.MitsubishiElectric.co.jp)   (mailto:prd.gnews@nk.MitsubishiElectric.co.jp)
 www.MitsubishiElectric.com/bu/powersystems/          www.MitsubishiElectric.com/news/

 

Notice Regarding Improper Quality Control Practices

for Transformers Rated 22kV 2MVA or Above

 

TOKYO, April 21, 2022 - Mitsubishi Electric Corporation
(https://www.mitsubishielectric.com/) (TOKYO: 6503) announced today that
internal investigations being conducted by the external Investigative
Committee established by the company on July 2, 2021, revealed to the company
on April 1 that several inspections of transformers rated 22kV 2MVA or above
manufactured at Mitsubishi Electric's Transmission & Distribution Systems
Center in Ako, Hyogo Prefecture, did not fully comply with customer-requested
testing standards that required compliance with the Japan Electrotechnical
Committee (JEC), International Electrotechnical Commission (IEC), or Institute
of Electrical and Electronics Engineers (IEEE) standards. The Investigative
Committee also confirmed cases where improper statements were entered in
inspection reports. In addition, several designs were found to differ from
internal-design guidelines or agreements with customers.

 

Mitsubishi Electric halted shipments of the products in question as soon as
the issues were disclosed to company management. Currently, only those
products confirmed to have been inspected properly are being shipped.
Customers using the products in question are now being notified of the
situation. To this date, the company has not received any notification by the
customers regarding the improper quality control practices. Mitsubishi
Electric is willing to implement special inspections of the products in field
upon discussion with customers.

 

The committee's investigation of the Ako factory is still ongoing and
Mitsubishi Electric will publicly announce any other serious matter, including
possible improper quality control practices of other products, if identified
hereafter.

 

The root cause of these incidents as well as new measures to prevent any
recurrence will be announced as soon as the Investigative Committee issues its
final report. Meanwhile, Mitsubishi Electric is continuing to cooperate with
the committee to help it complete its investigations as soon as possible.

 

At present, Mitsubishi Electric has determined that there is no need to revise
its consolidated earnings forecast for the current fiscal year. The company,
which is working sincerely with customers and implementing necessary
preventive measures, will disclose any potential impact on consolidated
earnings forecast that comes to light hereafter.

 

Products in Question

Transformers (22kV 2MVA or above)

Total units:  8,363 shipped from 1982 to March 2022

(6,035 units delivered to customers in Japan & 2,328 units to customers
overseas)

Total units subjected to any improper practice [1) - 4) below]:  3,384

(1,589 units delivered to customers in Japan & 1,795 units to customers
overseas)

 

Discrepancies Identified (as of April 21, 2022)

1)    Dielectric Tests

Dielectric tests were conducted at lower voltages than specified by the JEC,
IEC or IEEE standard, but voltages required by the standard or customers were
entered in test reports. Also, reported results of partial discharge
measurements conducted simultaneously with these tests were not accurate.

2)    Temperature Rise Tests

Measured temperatures exceeded the maximums specified by the JEC, IEC or IEEE
standard or customers, but temperatures below the maximums were entered in
test reports.

3)    Load Loss Measurements

Measured load losses exceeded guaranteed values, but values within the
guarantees were entered in test reports.

4)    Insulation, Temperature and Load Loss Designs

Insulation designs: Designed voltages were lower than those specified in
internal design guidelines based on the IEC or IEEE standard.

Temperature designs: Designed temperatures were higher than those specified in
the internal design guidelines based on the IEC or IEEE standard.

Load loss designs: Designed load loss value exceeded those previously
guaranteed with customers.

 

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About Mitsubishi Electric Corporation

With 100 years of experience in providing reliable, high-quality products,
Mitsubishi Electric Corporation (TOKYO: 6503) is a recognized world leader in
the manufacture, marketing and sales of electrical and electronic equipment
used in information processing and communications, space development and
satellite communications, consumer electronics, industrial technology, energy,
transportation and building equipment. Mitsubishi Electric enriches society
with technology in the spirit of its "Changes for the Better." The company
recorded a revenue of 4,191.4 billion yen (U.S.$ 37.8 billion*) in the fiscal
year ended March 31, 2021. For more information, please visit
www.MitsubishiElectric.com

*U.S. dollar amounts are translated from yen at the rate of ¥111=U.S.$1, the
approximate rate on the Tokyo Foreign Exchange Market on March 31, 2021

 

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