This article discusses the identity of the church Pasamuwan Kristen (community members) of Gereja Kristen Jawa/Java Christian Church (GKJ) Margoyudan, Surakarta, Central Java. Pasamuan Kristen GKJ Margoyudan’s identity construction is based on two factors: internal identity and external identity. By employing documents/literature review and in-depth interviews, this research found that the construction of internal identities of Pasamuan Kristen GKJ Margoyudan was built from the long history of Zending Missionary’s role from the Netherlands. The Zending Missionary had delivered the first identity of GKJ Margoyudan as a church which has characteristic of Javanese fellowship but still following many agreements of European social identity, Javanese culture domination as the main identity, and the church building as community solidarity identity. From the external side, the support came from synod of GKJ as the center of evangelism and the government, especially Central Java government. Synod of GKJ and the government support the church community to preserve Javanese culture through Javanese songs, Javanese language, and other related culture activities. They also transformed the church building into a cultural heritage in order to assimilate it with the social identity. The research found a conclusion that stronger acceptance from others to GKJ Margoyudan is partly because of the social role of the church in education and health since long ago. GKJ Margoyudan is accepted in the wider community as an assimilationist identity.

<p><em>In the electric power system, the transmission system is a pathway to transmit electrical energy from the generator to the substation or from the substation to another substation which allows power losses and large voltage drops if the transmission length is relatively far and the overload is very high. affect the reliability of the transmission system. Analysis of power losses and voltage drop on the 150 KV high voltage transmission system at the Pati substation to the Jekulo substation. The analysis was carried out by conducting a survey at the research location then doing manual calculations and calculations using ETAP 12.6.0 software. The research method used was that the researcher collected voltage and current data at 10.00 and 19.00 WIB in one month and the transmission system supporting equipment specifications to be simulated in ETAP 12.6.0 from Pati and Jekulo substations in order to make comparisons between manual calculations and ETAP. 12.6.0.The conclusion of this study is the calculation of power losses manual calculation and simulation of ETAP 12.6.0 has a difference of 2.5% with the value of manual calculation power losses of 685.5 KW and the power losses from The simulation results reached 266.6 KW and the calculation of the presentation of power losses in the transmission line of GI Pati - GI Jekulo reached 6.8% exceeding the service percentage variation limit due to losses according to SPLN No. 72 of 1987 a maximum of 5% at least -10%.</em></p>