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VCHRP-TM an universal VFD for AC industrial loads up to 17,500 kVA with 3 kV, 6 kV and 10 kV nominal output voltage. Due to high quality of development and production, VCHRP-TM can operate with the already installed and the new asynchronous or synchro- nous motors.
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KSO 307 Single-end service assembled chamber.


KSO 307 single-end service assembled chamber is designed to receive and distribute electric power in electrical facilities with three-phase 50 or 60 Hz alternating current, 6 or 10 kV voltages and with insulated neutral or neutral with Peterson-coil; to open and close load current and fault current; to control and protect lines and power distribution transformers in industrial facilities and mines, high-rise buildings, homes, assembled substations etc.

KSO switchgear are made for domestic use as well as for export. Several KSO 307 chambers can be combined into switchgears for receiving and distributing electric power.

Operational principal is defined by arrangements of main and auxiliary circuitries.

KSO switchgears can be used as high voltage devices for complex transformer substations of KTP-10/0,4 (-10/0,4) and BMKTP-10/0,4 (-10/0,4) series with power from 100 to 3150 kVA.

Climatic versions are Y(moderate) and area class is 3 according to GOST 15150-69.

KSO-307 switchgears are made according to technical specification BKGI.674731.185 TY (.674731.185 ).

KSO 307 single-end service assembled chamber

Special traits

  • compactness (front width - 410 mm, depth - 915 mm, height - 1600 mm);
  • different kinds of interlocks for protection from wrong operations during maintenance and repair;
  • Convenient and simple maintenance;
  • Presence of full range of main circuit arrangement and secondary commutation circuit arrangement according to customers needs;
  • At customer request Russian and foreign commutation devices and relaying and automation devices (including microprocessor-based) can be used;
  • using modern techniques in manufacturing (metal cutting, bending and perforation on FINN-POWER automatic complexes);
  • manufacturing from galvanized metal, which allows to use switchgears in corrosive environment.

Naming conventions for KSO 307 type switchgear

KSO-307-<A>-<B> <C> <D>

- chamber

- assembled

- single-end service

307 - Type and year of development

<A> - Index of main-circuit arrangement

<B> - rated current

<C> - rated voltage: 06 - 6 kV; 10 - 10 kV

<D> - Climatic versions and area class according to GOST 15150-69 and GOST 15543.1-89


Example of naming for KSO-307 switchgear with 630 A rated current, 10 kV rated voltage, main circuit arrangement N 09 and climatic version Y3:

Switchgear KSO 307-09-630 10 Y3 BKGI.674731.185 TY.

Technical data

Climatic version of KSO is Y (moderate) and area class is 3;

Overall dimension and mounting dimension of KSO switchgear are described in appendix A.

Rated values of climatic version are accorded with GOST 15150-69 and GOST 15543.1-89.

At that:

- environment temperature: from -25 up to +40º,

- atmospheric type is II (industrial) as to GOST 15150-69;

- altitude: up to 1000m.

The environment is not explosive, not containing conductive dust, corrosive gases and vapors in high concentrations, which destroying metal and insulation.

General quantities of KSO-307

name of the parameter value
Rated voltage, kV 6,0; 10,0
Maximum operating voltage, kV 7,2; 12,0
Rated current of main circuits, A 630
Rated breaking current, kA 20
Thermal short-time current rating (3 seconds duration), A 20
Short-time withstand current, kA 51
* Rated current of current transformers, 50; 75; 100; 150; 200; 300; 400; 600
Test voltage with industrial frequency of 50 Hz (1 minut):
  - main circuit insulation, kV
  - insulation of support circuit, kV

Rated voltage of supply circuits:
 - protection, control and indication circuits with direct and alternating current, V
 - Circuits of voltage transformers, V
 - Circuits of auxiliary supplies transformers, V

220; 380
Conventional fusing current, 3,2; 5; 8; 10; 16; 20; 31,5 ÷ 160;200
* thermal and withstand current ratings of current transformers are defined by their technical specification.

Classification of KSO designs

Name of the parameter description
Insulation level according to GOST 1516.1-76 with normal insulation

Type of insulation

air insulation
Presence of insulation of current conducting parts of main circuit with uninsulated bridges
with insulated bridges
with partly insulated bridges
System of busbar With one set of busbar
Type of service Single-end service
Type of linear high-voltage feeders cable or bridge
Type of control Local and remote control
Conditions of installation KSO is designed for indoor installation in electro facilities
Protection class as to GOST 14254-96 IP30 for front and side panels
IP20 for other parts of KSO
Types of switchgears depending on inline equipment KSO switchgear with load breaker SL12-B, 630 A;
KSO switchgear with load breaker FLN36-12SF6;
KSO switchgear with load breaker SFG;
KSO switchgear with load breaker and fuses SL12-BTB-F;
KSO switchgear with fused breaker FLRN36 -12SF6;
KSO switchgear with load breaker SFG and fuses;
-KSO switchgear with voltage transformers NOM, NOL.08 and with antiresonance group 3ZNOL.06, 3ZNOLP;
KSO switchgear with breakers SL12-D for 1000 A;
KSO switchgear with grounders SL12-E;
KSO switchgear with surge arresters;

KSO switchgears are made according to:

- main circuit arrangements listed in appendix B

- main circuit arrangement provided by customer

Manufacturer can replace above mentioned devices with analogs.


KSO switchgear is metal devices assembled from zinced metal sheets. Front doors are made from rolled steel sheets and painted with powder paint RAL 7035.

Devices of main circuit are placed inside chamber. Circuit-breaker operator, indication, signalization and control devices are placed on front panels of KSO chamber.

KSO chamber has windows to observe inside of chamber and to control position of grounding blades.

On installation frame of switchgear is connected to metal ground.

Ground bars are painted in black or yellow-grin stripes.

Devices for auxiliary connections are placed inside relay panel. Devices for indication and control are installed on the door of relay panel. Inside relay panel there are also terminal block, to which backbone cables of auxiliary circuit are connected passing through windows in relay panel.

To protect from wrong operation during maintenance or repair there are several interlocks in switchgears:

  • An interlock to prevent doors opening while load-breaker is on;
  • An interlock to prevent doors opening while grounding blades are disconnected;
  • An interlock preventing turning on commutation devices while door of high voltage devices is opened;
  • An interlock to prevent turning on grounding blades if working blades of isolating switches or load-breakers are on;
  • An interlock to prevent turning on isolating switches if grounding blades are on;

Note - for other kinds of protection according to main circuit arrangement additional locks and control contact using in signalization and automation circuits can be installed according to special request.

Figure .1 Overall and installation dimension for KSO-307 with 3-position load breaker SL12-BTB-F.
    1 - busbar panel; 2 - relay panel; 3 - panel for load breaker; 4 - cable panel.

Figure .2 Overall dimension for KSO-307 with SF6 circuit-breaker SL12-DHB.

Figure .3 Overall and installation dimension for KSO-307 with 3-position load breaker SL12-BT.

.4 Overall dimension for KSO-307 with SF6 circuit-breaker SL12-E.

Figure .5 Overall, installation and linkage dimensions for KSO-307 with customized main circuit arrangement.

Figure .6 Overall dimension for KSO-307 with fused breaker FLRN36 -12SF6;

.7 Overall dimension for KSO-307 with 3-phase antiresonance group 3xZNOLP-6(10);

Figure .8 KSO chamber with bigger relay panels.

Figure .9 Installation of KSO-307 switchgear.
   1 - KSO-307 switchgear; 2 - gripe for breaker operating .

Figure .10 Lifting and moving one switchgear or set of two or three switchgears within manufactory or loading bay

Figure .11 Example of installation for KSO-307

Main circuit arrangement for KSO-307


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