Sets for testing LPITs

In response to the growing need for the equipment capable of testing current or voltage LPITs (Low power instrument transformers), Mars-Energo offers test sets, all based on a duel-channel reference comparator of voltage MarsComp K-1000 especially designed for this purpose.

Our test sets range from a budget one (no PC control) to the automated setups complete with a PC-controlled source of current or voltage test signals that provide fully automatic control of test process from a PC.

If not only LPITs but also conventional transformers would need to be calibrated with one and the same test system, any of these sets could be complemented with a “traditional” comparator Energomonitor 3.1KM (accuracy class 0.05) or Energomonitor 3.3T1 (accuracy class 0.1).

1. Budget set for testing current LPITs

The test set is equipped with a source of test current IT5000 that does not support a PC control function. Therefore, the set allows LPITS to be tested just in the manual mode.

The IT5000 current source and the reference transformers of TTIP series produced by Mars-Energo can be replaced with either a suitable customer’s current source or customer’s reference transformers with appropriate characteristics and accuracy.

Basic characteristics of current LPITs under test:

Applicable standards	IEC 60044-8, IEC 61869-10
Primary current range	0.05 A to 6000 A
Metering accuracy	IEC class 0.2S (or less accurate)
Low-energy analog outputs	0.5 mV to 9 V

2. Automated set for testing current LPITs

This set will provide max ranging and functionality (available at Mars-Energo) with respect to testing of current LPITs. The source of test current IT5000A is PC-controlled, that is why testing can be performed in fully automatic mode.

The reference transformers of TTIP series produced by Mars-Energo can be replaced by customer’s reference transformers with suitable characteristics and of appropriate accuracy.

Basic characteristics of current LPITs under test:

Applicable standards	IEC 60044-8, IEC 61869-10
Primary current range	0.05 A to 6000 A
Metering accuracy	IEC class 0.2S (or less accurate)
Low-energy analog outputs	0.5 mV to 9 V
Electronic turns ratio	user selectable

3. Multi-purpose set for testing current transformers (LPITs + Conventional CTs)

To test conventional CTs, set 1 or set 2 for testing current LPITs can be complemented with the units listed below. The burden box (produced by other manufacturer) can be replaced by a customer’s burden box with suitable characteristics.

Basic characteristics of conventional CTs under test:

Applicable standards	IEC 61869-2
Primary current range	0.05 A to 6000 A
Metering accuracy	Class 0.2S (or less accurate) with the comparator EM 3.1KM Class 0.5S (or less accurate) with the comparator EM 3.3T1
High-energy analog outputs	1 A, 5 A

4. Automated set for testing voltage LPITs

This set will provide max ranging and functionality (available at Mars-Energo) with respect to the testing of voltage LPITs. Depending on the desired range, the set may include one of the test voltage sources (both PC-controlled): up to 35 kV, or up to 110/√3 kV.

The test voltage source up to 35 kV consists of a test transformer (produced by other manufacturer, replaceable by a customer’s one) and a laboratory-type variable-ratio transformer LATR-IT5000A (controlled from a PC).

The HV module for testing VTs 110/√3 kV is produced by other manufacturer, and thus it can be replaced by a customer’s one.

The primary voltage range can be expanded up to 330/√3 kV (with use of the Mars-Energo’s reference voltage transducer CHVT-330 up to 330/√3 kV), however the weight of the corresponding HV module adds up to
1450 kg.

Basic characteristics of voltage LPITs under test:

Applicable standards	IEC 60044-7, IEC 61869-11
Primary voltage range	single-phase; up to 35 kV; up to 110/√3 kV (up to 330/√3 kV)
Metering accuracy	Accuracy class 0.5 (or less accurate)
Low-energy analog outputs	0.5 mV to 9 V
Electronic turns ratio	user selectable

5. Multi-purpose set for testing voltage transformers
(LPITs + Conventional VTs)

To test conventional VTs, a set for testing voltage LPITs can be complemented with the units listed below. The burden box (produced by other manufacturer) can be replaced by a customer’s burden box with suitable characteristics.

Basic characteristics of conventional VTs under test: