Prefabricated Chambers of Unilateral Service (PCUS) are designed for the reception, metering, and distribution of three-phase AC electrical power with a rated voltage of 380/220 V and a frequency of 50 Hz. They are used in solidly grounded neutral systems to protect outgoing feeders against overloads and short-circuit currents.
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The PCUS-393-MB series is manufactured using vacuum circuit breakers, load-break switches, disconnectors, and other electrical apparatus, together with modern relay protection and automation systems. The main circuit diagrams and brief technical characteristics are provided in Table 1.
The general arrangement and overall dimensions of the chambers are shown in Figure 1.
Secondary circuits are manufactured according to standard wiring diagrams or the customer's project documentation.
The operational supply voltage and the relay protection equipment are specified by the project documentation (technical questionnaire).
The switchgear assembly is configured in accordance with the technical questionnaire.
Individual components of the switchgear, including chambers, bus bridges, and other elements, can also be manufactured separately.
Climatic design: U3 in accordance with GOST 15150.
Degree of protection in accordance with GOST 14254:
To order a switchgear assembly, a completed technical questionnaire must be submitted, including the single-line diagram, equipment parameters, and the layout of the PCUS chambers within the switchgear.
| Parameter | Value |
|---|---|
| Rated voltage (line-to-line), kV | 6; 10 |
| Maximum operating voltage, kV | 7.2; 12 |
| Rated power supply frequency, Hz | 50 |
| Rated current of main circuits (except chambers with load-break switches), A | 400; 630; 1000 |
| Rated current of main circuits with load-break switches, A | 400 |
| Rated current of busbars, A | 630; 1000 |
| Rated current of bus bridges, A | 630; 1000 |
| Rated current of power fuse links, A | 2 to 100 |
| Electrodynamic withstand current, kA, max. | 51 |
| Thermal withstand current, kA, max. | 20 |
| Duration of thermal withstand current, max.: | |
| – for 400 A and 630 A chambers | 2 |
| – for 1000 A chambers | 3 |
| Rated voltage of operational circuits (specified upon ordering) | 220 V AC or DC |
Upon request, PCUS-204 chambers can be manufactured with non-standard main and secondary circuit configurations, as well as bus bridges with custom distances between front facades.
| Name and Element Type | Application | Single-Line Diagram | Main Power Circuit Devices |
| PCUS-393-MB | - Cable incoming feeder; - Cable line; - Transformer feeder | Diagram 1 | RVPZ-10/630 VV/TEL-10-630 TOL-10 OPN-KR/TEL RV-10/630 TZLM-1 |
