TETRA CO ltd

TETRA CO ltd. was founded in 1992 by a group of faculty members of Kharkov Polytechnic Institute (Ukraine).

The main directions of the company activities are development and production of high-end electrical products.

OUTPUT PRODUCTS:

Hand-held devices of electric machine diagnostics (WDI-05, TIDI-02, BDI-04);

Electric motor protection equipment (EMPR-6);

Over 3000 enterprises in the former USSR republics are TETRA ltd. products consumers.

The company products are covered by patents.

Highly-qualified specialists, among whom are lecturers of National Technical University “Kharkov Polytechnic Institute”, experts in the fields of electromechanics, electrical engineering, measurement instrumentation, and programming, work for us.

The company address:	Electrical Machine Department National Technical University “Kharkov Polytechnic Institute” 21 Frunze St. Kharkov, 61002 Ukraine
Telephone:	(+38) (057) 720-22-13, 714-38-38
Fax:	(+38) (057) 714-09-43
E-mail:	mark@tetra.kharkiv.com

General distributor of the TETRA electronic production in Russia is TETRA-INTER ltd.

The address:

5 Litvinivoy St., office 5

Shebekino, Belgorod Region, 309293

Russia

Telephone/Fax:

(+7) (47248) 459-31, 4-22-16

ATTENTION TO POWER SYSTEM DIVISION MANAGERS!

TETRA CO ltd. offers you devices of electric machine diagnostics and protection.

We hope the equipment advertised will prove to be useful and profitable for your enterprise and help you rid yourself of problems resulted from electric equipment maintenance and repair.

Faithfully,

Igor S. Shchukin, Director dir@tetra.kharkiv.com

Andrey A. Ilnitskiy Marketing Division Manager mark@tetra.kharkiv.com

Electric-Machine Winding Defect Indicator WDI-05

Connecting cable Connecting leads Power supply unit

WDI-05 is a hand-held device intended for three-phase electric-machine winding inspection.

WDI-05 provides detection of

turn-to-turn fault;

conductor break;

winding form misconnection;

poor condition of winding-to-housing and winding insulation.

WDI-05 allows identification of three-phase winding defects in electric machines of voltage up to 1000 V without their dismantling.

Principle of The indicator Operation:

At winding testing for turn-to-turn faults, conductor break and circuit connection correctness, impedances of two winding phases connected to a high-frequency regulated current generator are compared. When there are defects, the winding phases impedances and, consequently, the phase currents will be different;

At checking condition of winding-to-housing and winding insulation, the winding is energized with DC voltage and creeping current is measured.

Performance Data

1) controllable parameters:
- at winding testing for turn-to-turn faults, conductor break and circuit connection correctness	phase-current unbalance factor (K_u)
- at checking condition of winding-to-housing and winding insulation	insulation resistance (R_i)
2) K_u measurement range, %	0-99
3) output alternating current parameters at K_u measurement -root-mean-square current, mA -frequency, Hz	1.5±0.15 10±1
4) sensitivity (K_u value with one short-circuited turn),%, not less than	5
5) output DC voltage at checking condition of winding-to-housing and winding insulation, V	1000±100
6) indication	LED indication and LED alphanumeric three-digit indication
7) power supply	self-contained power supply or from an external power source
8) supply voltage, V	7.2 (-1.2 +1.6)
9) power consumption, W, not more than	3
10) overall dimensions, mm	205´ 80´ 50
11) weight, kg, not heavier than	0.5

Warranty assurance is 24 months since the date of purchase

Electric-Machine Winding Defect Indicator TIDI-02

TIDI-02 is a hand-held device intended for checking turn-to-turn insulation and electric-machine coil circuits, winding-to-housing and winding insulation.

TIDI-02 provides detection of

slots and coils with short-circuited turns;

slots and coils with conductor break in commutator machine armatures;

poor condition of winding-to-housing and winding insulation.

TIDI-02 allows identification of stator/rotor winding pattern defects in dismantled electric machines of voltage up to 1000 V.

Principle of The indicator Operation:

At checking turn-to-turn insulation and coil circuits, an impulse electromotive force is induced in the coil being tested. In case there are short-circuited turns in the coil, a magnetic field pulse from short-circuit current in them is recorded;

At checking condition of winding-to-housing and winding insulation, the winding is energized with DC voltage and creeping current is measured.

Performance Data

1) controllable parameters:
- at checking turn-to-turn insulation and coil circuits	current in the coil being tested
- at checking condition of winding-to-housing and winding insulation	insulation resistance (R_i)
2) maximum number of effective conductors in the slot being tested: using a small sensor using a large sensor	150 60
3) maximum width of the groove (opening) of the slot being tested, mm	12
4) minimum length of the laminal of the machine being tested, mm	45
5) impulse electromotive force amplitude induced in the coil at testing its turn-to-turn insulation or circuit, V/turn	1, 2, 4, 15
6) output DC voltage at checking condition of winding-to-housing and winding insulation, V	1000
6) indication	LED and audible indication
7) power supply	self-contained power supply or from an external power source
8) supply voltage, V	7.2 (-1.2 +1.6)
9) power consumption, W, not more than	2
10) overall dimensions, mm	205´ 80´ 50
11) weight, kg, not heavier than	0.5

Warranty assurance is 24 months since the date of purchase

Electric-machine bearing defect indicator BDI-04

BDI-04 is a hand-held device intended for vibration check in electric machines, as well as in other rotating machinery, and for their frictionless bearing condition monitoring.

BDI-04 provides detection of

intensity of machine vibration;

wear rate of bearing race and rolling elements;

quality of bearing lubrication and installation;

bearing heating.

BDI-04 may be used by businesses utilizing electric machines and other rotating machinery of capacity up to 400 kW and operating speed of 350 rpm through 6000 rpm.

Principle of BDI-04 Operation

At checking intensity of machine vibration, BDI-04 compares the root-mean-square value of observed vibration velocity in the controllable frequency band with threshold values and detects (displays) an event of corresponding threshold value overriding.

At checking wear rate of bearing race and rolling elements and quality of bearing lubrication and installation, BDI-04 compares peak (maximum) values of observed vibration acceleration with threshold values in two most informative frequency bands, an event of corresponding threshold value overriding being detected via the number of vibration acceleration pulses relative to the concerned threshold value within a specified measurement time.

At checking bearing heating, BDI-04 compares observed bearing temperature with threshold values and detects an event of corresponding threshold value overriding.

Performance Data

1) controllable parameters:
- at checking intensity of machine vibration	vibration velocity (root-mean-square value)
- at checking wear rate of bearing race and rolling elements and quality of bearing lubrication and installation	vibration acceleration (peak value)
- at checking bearing heating	temperature
2) controllable dynamic range
- at checking intensity of machine vibration, mm/c	0.28-18
-at checking wear rate of bearing race and rolling elements, decibel	104-140
-at checking quality of bearing lubrication and installation, decibel	94-130
3) controllable frequency band, Hz
- at checking intensity of machine vibration	10-1000
-at checking wear rate of bearing race and rolling elements	500-1200
-at checking quality of bearing lubrication and installation	8000-8500
4) controllable temperature range at checking bearing heating, C	60-105
5) indication	LED
7) power supply	self-contained power supply or from an external power source
8) supply voltage, V	7.2 (-1.2 +1.6)
9) power consumption, W, not more than	1
10) overall dimensions, mm	205´ 80´ 50
11) weight, kg, not heavier than	0.5

BDI-4 is supplied with an external reference vibration source for reading adequacy verification. Warranty assurance is 24 months since the date of purchase

Electronic electric-machine protection relay EMPR-6

EMPR-6 is intended for protection of asynchronous motors and machinery rotated by them (water pumps) by means of its deactivation and startup blocking in case of the following emergency conditions:

prohibitive current overload of the motor resulted from a stator winding phase failure, phase voltage unbalance, processing overload, rotor seizure, or turn-to-turn faults;

abnormal loss of the motor load (“dry running” of a water pump);

insufficient winding insulation resistance with respect to the dead motor housing;

thermal overload of the motor resulted from deterioration of its cooling conditions.

EMPR-6 can be used in each of the above-mentioned emergency modes taken seperately.

EMPR-6 functions jointly with a solenoid starter (a contactor switch), the control circuit of which is connected to 220/380 V - 50 Hz mains, a current sensor and a temperature probe.

The number of a current sensor type is chosen by a customer depending on the controllable currents range:
N1: 1-5 A, N2: 5-25 A, N3: 25-125 A, N4: 125-625 A.

Principle of EMPR-6 operation is based on processing of current sensor and temperature probe signals. When a signal exceeds a preset relay setting, an interposing relay in the feed circuit of the solenoid starter (contactor switch) coil operates, cuts it off to result in cutting off the motor.

Performance Data

1) rated operating current in the solenoid starter control circuit under rated operating voltage of 220/380 V, A	8/5
2) rated operating current in the motor status signalling circuit rated operating voltage amplitude of 400 V, A	0.11
3) response time, s
- in case of current overload of the motor	automatic regulation based on the relay protective performance
- in case of thermal overload of the motor	1
- in case of abnormal loss of the motor load	1-5
4) the relay setting control range:
- current control (maximum and minimum), % of the rated motor current	100
-temperature control, ° C	25-115
5) insulation resistance setting (non-controllable), MOhm	0.5± 0.05
6) setting control	slide
7) supply voltage, V	220 (-44 +22)/50 Hz
8) power consumption, W, not more than	2
9) maximum line length, m, not longer than
- between the relay and the current sensors	10
- between the relay and the temperature probe (for the line resistance not more than 10 Ohm)	100
10) the casing protection rate	IP30
11) overall dimensions, mm	90´ 90´ 65
12) weight, kg, not heavier than	0.25

Warranty assurance is 24 months since the date of purchase

LIST OF PATENTS

N	Type of patent	Title	ICI	Patent holder
1	Russian Federation Patent N 2186279 of 27.07.2002, Bulletin N 21	Blocking Gas Cock	F 16 K 21/04	TETRA CO ltd. (Ukraine)
2	Declaratory Ukraine Patent N 35120 of 15.03.2001, Bulletin N 2	Blocking Gas Cock	F 16 K 21/04 F 16 K 5/00	TETRA CO ltd. (Ukraine)
3	Ukraine Patent N 23537 of 02.06.1998, Bulletin N 4	Linear Impact Motor	H 02 K 41/025	TETRA CO ltd. (Ukraine)
4	Declaratory Ukraine Patent N 31757 of 15.12.2000, Bulletin N 7-II	Wind-Driven Powerplant	F 03 D 3/00	TETRA CO ltd. (Ukraine)
5	Russian Federation Patent N 2091971 of 27.09.1997, Bulletin N 27	Linear Impact Induction Motor	H 02 K 41/025	TETRA-INTER ltd. (Russia)

TETRA ltd. is ready to issue a license to use of the patented inventions.